Plastic pipe extruder

Abstract

Plastic pipe extruder relates to the field of plastic extrusion molding, including machine body, flow dividing device, cleaning device and waste recycling device, the flow dividing device is provided with flow dividing passage, built-in flow dividing plate with filter screen, feed inlet is connected with machine cylinder discharge end, discharge outlet and machine head feed end are connected. The gas nozzle of the cleaning device is located between the discharge outlet and the flow dividing plate, and can move up and down relative to the flow dividing passage; the discharge port at the bottom of the flow dividing passage is between the flow dividing plate and the feed inlet, and is connected by the discharge control valve. The waste recycling device is arranged below the flow dividing body and is communicated with the discharge port, and then connected to the top of the machine body hopper through the conveying pipeline, and the bottom of the hopper is communicated with the inside of the machine cylinder. The impurities on the filter screen can be automatically cleaned, the mesh hole is prevented from being blocked, the flow dividing plate does not need to be removed during cleaning, the operation process is simplified, the equipment downtime is reduced, the production efficiency is effectively improved, and the plastic waste recycling function is also provided.

Description

Technical Field

[0001] This application relates to the field of plastic pipe extrusion molding technology, and more particularly to plastic pipe extruders. Background Technology

[0002] HDPE (High-Density Polyethylene) and MPP (Modified Polypropylene) are two widely used plastic materials in engineering fields. Pipes are commonly made from these two materials, and HDPE and MPP plastic pipes are typically manufactured using extrusion. A plastic pipe extruder is a piece of equipment used to produce plastic pipes, comprising a screw, barrel, hopper, die head, and mold. The plastic raw material enters from the hopper and falls into the barrel under gravity. The barrel, in conjunction with the screw, crushes, softens, and melts the plastic, conveying the molten plastic forward. The molten plastic flows into the die head, where it is extruded into plastic pipes of the desired shape and length.

[0003] During pipe extrusion, impurities and unmelted particles in the raw material can cause stress concentration. These stress concentration points can easily lead to perforations or holes in the inner or outer wall of the pipe during hot forming, resulting in defective products. This not only increases production costs but also reduces production efficiency. To avoid or reduce defective products, a manifold with a filter screen is now installed on the pipe extruder. The molten plastic passes through the manifold, filtering out impurities and unmelted particles. However, these impurities and unmelted particles gradually accumulate on the filter screen, causing blockage. Currently, when blockage occurs, the manifold is typically removed manually after stopping the machine, and the filter screen is cleaned. This cleaning method is not only inefficient but also labor-intensive, increasing production costs. Summary of the Invention

[0004] This application provides a plastic pipe extruder to solve the technical problem in the prior art that the filter screen needs to be manually removed for cleaning, which is not only inefficient but also increases production costs. The technical solution is as follows: This application provides a plastic pipe extruder in one embodiment, comprising: The machine body, on which a machine barrel and a machine head are provided; The diversion device includes a diversion body and a diversion plate. The diversion body is fixed to the machine body and is located between the discharge end of the machine barrel and the feed end of the machine head. The diversion body has a diversion channel inside, and the diversion plate is located in the diversion channel. A filter screen is provided on the diversion plate. The diversion body has a feed inlet and a discharge outlet. The feed inlet is connected to the discharge end of the machine barrel, and the discharge outlet is connected to the feed end of the machine head. The diversion channel is connected to the feed inlet and the discharge outlet. A cleaning device includes a gas nozzle and a discharge control valve. The gas nozzle is located between the outlet and the diverter plate. The gas nozzle is movable up and down relative to the diverter channel. The bottom of the diverter channel has a discharge port located between the diverter plate and the inlet. The discharge control valve controls the connection between the discharge port and the interior of the diverter channel.

[0005] In one embodiment, the diversion body has two diversion channels inside, through which molten raw materials alternately pass. Each of the two diversion channels is equipped with a diversion plate and a filter screen. Both diversion channels are connected to the inlet and outlet. Each of the two diversion channels has a discharge port at its bottom. There are also two cleaning devices. Two gas nozzles are respectively located between the outlet and the two diversion plates. Two discharge control valves respectively control the connection between the two discharge ports and the corresponding diversion channels.

[0006] In one embodiment, the plastic pipe extruder further includes: A valve device includes a valve mounting bracket, a feed valve, a discharge valve, and a valve drive. The valve mounting bracket is fixed to the diversion body. The feed valve is located between the feed inlet and the discharge outlet, and the discharge valve is located between the discharge outlet and the gas nozzle. The feed valve and the discharge valve are connected by a valve connecting plate. The valve drive is fixed to the valve mounting bracket and connected to the valve connecting plate. The valve drive drives the valve connecting plate to move up and down. Both the feed valve and the discharge valve have material through holes. The feed inlet communicates with the diversion channel through the material through hole on the feed valve, and the discharge outlet communicates with the diversion channel through the material through hole on the discharge valve.

[0007] In one embodiment, the cleaning device further includes a nozzle drive and a nozzle fixing member. The nozzle drive is fixed to the body and connected to the nozzle fixing member. The gas nozzle is fixed to the nozzle fixing member. The bottom of the diversion channel has a nozzle moving channel adapted to the nozzle fixing member. The nozzle fixing member is placed in the nozzle moving channel, and the nozzle drive drives the nozzle fixing member to move within the nozzle moving channel.

[0008] In one embodiment, the cleaning device further includes a discharge drive component fixed to the machine body and connected to the discharge control valve. The bottom of the diversion channel has a valve movement channel adapted to the discharge control valve, and the valve movement channel communicates with the discharge port. The discharge drive component drives the discharge control valve to move within the valve movement channel. The diversion body has a discharge channel, and the discharge channel communicates with the valve movement channel.

[0009] In one embodiment, the plastic pipe extruder further includes a rotating device, which includes a rotating motor and a rotating gear. The rotating motor is fixed to the flow divider body and connected to the rotating gear. The outer edge of the flow divider plate has teeth, and the rotating gear meshes with the teeth.

[0010] In one embodiment, the cleaning device further includes a scraper assembly, which includes a rotating scraper and a scraper mounting base. The scraper mounting base is movably connected to the flow divider plate, and the rotating device drives the flow divider plate and the scraper mounting base to rotate. The rotating scraper is hinged to the scraper mounting base and is located between the feed inlet and the flow divider plate. The scraper blade of the rotating scraper has an arc-shaped structure, and the rotating scraper adheres to the inner wall of the flow divider channel during rotation.

[0011] In one embodiment, the diverting body is further provided with a fixing device and a pressure regulating device. The fixing device includes a fixing plate, the inner wall of which has a fixing groove that mates with the teeth, and the fixing plate has a notch, in which the rotating gear is located. The pressure regulating device includes a driving cylinder, which is connected to the fixing plate. The driving cylinder drives the fixing plate to move closer to or further away from the diverting plate. The diverting plate is fitted with a plurality of sealing rings, and the diverting plate is sealed to the diverting body and the fixing plate through the sealing rings.

[0012] In one embodiment, the end of the rotating scraper has a scraper fixing part, one side of which is hinged to the scraper fixing seat. The scraper assembly also includes a movable shaft and a spring. A movable groove is provided on the flow divider plate. One end of the movable shaft is connected to the scraper fixing seat, and the other end of the movable shaft is located in the movable groove. The movable shaft can slide in the movable groove. The spring is sleeved on the movable shaft, and both ends of the spring abut against the scraper fixing seat and the flow divider plate, respectively.

[0013] In one embodiment, the plastic pipe extruder further includes a waste recycling device located below the diversion body. The discharge port is connected to the waste recycling device, which is connected to the top of the hopper on the machine body via a conveying pipe. The bottom of the hopper is connected to the interior of the barrel.

[0014] The advantages or beneficial effects of the above technical solutions include at least the following: When a large amount of impurities accumulate on the filter screen and cleaning is required, the flow of molten plastic through the diversion channel is first stopped. Then, the gas nozzle is moved upwards into the diversion channel, and simultaneously, the discharge control valve is opened to connect the discharge port with the inside of the diversion channel. Next, high-pressure inert gas is sprayed from the gas nozzle onto the diversion plate, backflushing the molten raw material containing impurities on the filter screen and diversion plate towards the discharge port. This allows the impurity-laden raw material to flow into the discharge port under gravity and be discharged. This embodiment, through the cleaning device, can automatically remove accumulated impurities from the filter screen, preventing clogging of the filter screen. Furthermore, cleaning does not require removing the diversion plate, saving labor costs and improving production efficiency. Attached Figure Description

[0015] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0016] Figure 1 This is a schematic diagram of a plastic pipe extruder. Figure 2 A schematic diagram of the structure of a plastic pipe extruder after the machine body has been removed; Figure 3 This is a schematic diagram of the internal structure of the main diversion body (part of the structure is in perspective). Figure 4 This is a sectional view of the main body of the diversion project; Figure 5 Another sectional view of the main body of the diversion project; Figure 6 This is a schematic diagram of another internal structure of the diversion body; Figure 7 A schematic diagram of the combination of the rotating device, the flow divider, and the scraper assembly; Figure 8 This is an exploded view of the manifold and scraper assembly; Figure 9 This is a schematic diagram of the combination of the pressure regulating device and the fixing device; Explanation of reference numerals in the attached figures: 1. Machine body; 2. Diverting device; 3. Cleaning device; 11. Barrel; 12. Machine head; 21. Diverting body; 22. Diverting plate; 23. Diverting channel; 24. Filter screen; 211. Feed inlet; 212. Discharge outlet; 31. Gas nozzle; 32. Discharge control valve; 25. Discharge port; 13. Hopper; 4. Valve device; 41. Valve fixing bracket; 42. Feed valve; 43. Discharge valve; 44. Valve drive component; 45. Material through hole; 46. Valve connecting plate; 33. Nozzle drive component; 34. Nozzle fixing component; 35. Nozzle moving channel; 36. Discharge drive component 37. Moving part; 26. Valve moving channel; 5. Discharge channel; 5. Rotating device; 51. Rotary motor; 52. Rotary gear; 221. Tooth; 6. Scraper assembly; 61. Rotary scraper; 62. Scraper fixing seat; 611. Scraper fixing part; 612. Rotating shaft; 613. Scraper blade; 63. Movable shaft; 64. Spring; 7. Fixing device; 71. Fixing plate; 711. Fixing groove; 712. Notch; 27. Sealing ring; 8. Pressure regulating device; 81. Drive cylinder; 222. Movable groove; 9. Waste recycling device; 91. Conveying pipeline; 10. Bearing. Detailed Implementation

[0017] The invention will be described in detail below with reference to specific embodiments.

[0018] like Figures 1 to 5 As shown, the plastic pipe extruder of this embodiment includes a machine body 1, a flow-dividing device 2, and a cleaning device 3. The machine body 1 is provided with a barrel 11 and a die head 12. The flow-dividing device 2 includes a flow-dividing body 21 and a flow-dividing plate 22. The flow-dividing body 21 is fixed to the machine body 1 and is located between the discharge end of the barrel 11 and the feed end of the die head 12. The flow-dividing body 21 has a flow-dividing channel 23 inside, and the flow-dividing plate 22 is located in the flow-dividing channel 23. A filter screen 24 is provided on the flow-dividing plate 22. The flow-dividing body 21 has a feed inlet 211 and a discharge outlet 212. The feed inlet 211 is connected to the discharge end of the barrel 11, and the discharge outlet 212 is connected to the feed end of the die head 12. The flow-dividing channel 23 is connected to both the feed inlet 211 and the discharge outlet 212. The cleaning device 3 includes a gas nozzle 31 and a discharge control valve 32. The gas nozzle 31 is located between the outlet 212 and the diverter plate 22, and the gas nozzle 31 can move up and down relative to the diverter channel 23. The bottom of the diverter channel 23 has a discharge port 25, which is located between the diverter plate 22 and the inlet 211. The discharge control valve 32 controls the connection between the discharge port 25 and the inside of the diverter channel 23.

[0019] When a large amount of impurities accumulate on the diversion channel 23 and needs cleaning, the flow of molten plastic through the diversion channel 23 is first stopped. Then, the gas nozzle 31 is moved upward and enters the interior of the diversion channel 23. Simultaneously, the discharge control valve 32 is used to open the discharge port 25, connecting the discharge port 25 with the interior of the diversion channel 23. Then, high-pressure inert gas is sprayed from the gas nozzle 31 onto the diversion plate 22, causing the molten raw material (waste) containing impurities on the diversion plate 22 and filter screen 24 to be blown back towards the discharge port 25. This allows the raw material containing impurities to flow into the discharge port 25 under gravity and then be discharged. In this embodiment, the cleaning device 3 automatically cleans the accumulated impurities on the diversion channel 23, preventing clogging of the filter screen 24. Furthermore, the diversion plate 22 does not need to be removed during cleaning, saving labor costs and improving production efficiency.

[0020] The machine body 1 is equipped with a hopper 13, the bottom of which is connected to the interior of the barrel 11. Plastic raw materials enter through the top of the hopper 13 and through the bottom into the barrel 11. Inside the barrel 11, the raw materials are crushed, softened, and melted. The molten raw materials are then conveyed by a screw within the barrel 11. After passing through the diverter plate 22 and filter screen 24, impurities are filtered out, and the rotating raw materials are converted into linear motion and conveyed to the die head 12. After passing through the mold in the die head 12, the required pipe is extruded. In this embodiment, the barrel 11, die head 12, machine body 1, and hopper 13 are all existing technologies. The diverter body 21 can be connected and fixed to the barrel 11 and die head 12 via flanges and bolts. The connection method between the diverter channel 23 and the diverter plate 22 is also existing technology, with the diverter plate 22 supporting the diverter channel 23.

[0021] Because cleaning the filter screen 24 of the manifold 22 requires stopping the molten plastic raw material from passing through the manifold channel 23 where the manifold 22 is located, the plastic pipe extruder needs to be shut down. Cleaning the filter screen 24 while the machine is shut down will affect the working efficiency of the plastic pipe extruder.

[0022] To ensure the efficiency of the plastic pipe extruder is not affected and to allow for cleaning of the filter screen 24 during operation, two diversion channels 23 are located inside the diversion body 21. Molten raw material alternately passes through these channels. Each diversion channel 23 is equipped with a diversion plate 22 and a filter screen 24. Both diversion channels 23 are connected to the feed inlet 211 and the discharge outlet 212, and each has a discharge outlet 25 at its bottom. Two cleaning devices 3 are also included: two gas nozzles 31 located between the discharge outlet 212 and the two diversion plates 22, and two discharge control valves 32 controlling the connection between the two discharge outlets 25 and the corresponding diversion channels 23.

[0023] In this embodiment, two diversion channels 23 are provided inside the diversion body 21, and the molten raw material alternately passes through the two diversion channels 23. When the filter screen 24 in one of the diversion channels 23 needs cleaning, the raw material stops passing through that diversion channel 23, and then the filter screen 24 in that diversion channel 23 is cleaned by the cleaning device 3. At this time, the raw material passes through the other diversion channel 23, and the plastic pipe extruder can continue to operate without stopping, and its working efficiency will not be affected.

[0024] Because there are two diversion channels 23, and the raw materials need to pass through the two diversion channels 23 alternately, the filter screens 24 in the two diversion channels 23 can be cleaned separately. At the same time, since both diversion channels 23 are connected to the feed inlet 211 and the discharge outlet 212, it is necessary to be able to control the connection between the feed inlet 211 and the discharge outlet 212 and the two diversion channels 23 separately. Otherwise, the filter screens 24 in the two diversion channels 23 cannot be cleaned separately by the cleaning device 3 when the plastic pipe extruder is running.

[0025] In order to control the connection between the two diversion channels 23 and the feed inlet 211 and the discharge outlet 212 respectively, the plastic pipe extruder of this embodiment also includes two valve devices 4, which control the connection between the two diversion channels 23 and the feed inlet 211 and the discharge outlet 212 respectively.

[0026] Specifically, such as Figures 3 to 5As shown, the valve device 4 includes a valve mounting bracket 41, an inlet valve 42, an outlet valve 43, and a valve drive component 44. The valve mounting bracket 41 is bolted to the upper surface of the diversion body 21. The inlet valve 42 is located between the inlet 211 and the outlet 25, and the outlet valve 43 is located between the outlet 212 and the gas nozzle 31. The inlet valve 42 and the outlet valve 43 are connected by a valve connecting plate 46. The valve drive component 44 is fixed to the valve mounting bracket 41 and connected to the valve connecting plate 46, driving the valve connecting plate 46 to move up and down. Preferably, the valve drive component 44 is a cylinder. The valve drive component 44 can simultaneously drive the inlet valve 42 and the outlet valve 43 to move up or down, thereby enabling the same diversion channel 23 to simultaneously connect with the inlet 211 and the outlet 212, or simultaneously close the connection between the same diversion channel 23 and the inlet 211 and the outlet 212.

[0027] In order to enable the connection between the feed inlet 211 and the discharge outlet 212 and the diversion channel 23, material passage holes 45 are provided on both the feed valve 42 and the discharge valve 43. The feed inlet 211 is connected to the diversion channel 23 through the material passage hole 45 on the feed valve 42, and the discharge outlet 212 is connected to the diversion channel 23 through the material passage hole 45 on the discharge valve 43.

[0028] During operation of the plastic pipe extruder, the valve drive 44 of one of the valve devices 4 simultaneously moves the feed valve 42 and the discharge valve 43 downwards, positioning the material through-hole 45 on the feed valve 42 between the feed inlet 211 and the diversion channel 23, which is connected to the feed inlet 211 via the material through-hole 45. Similarly, the material through-hole 45 on the discharge valve 43 is positioned between the discharge outlet 212 and the diversion channel 23, which is connected to the discharge outlet 212 via the material through-hole 45. Molten raw material can flow through the diversion channel 23, allowing the plastic pipe extruder to operate normally. Another valve device 4's valve drive 44 drives the feed valve 42 and discharge valve 43 to move upwards simultaneously, positioning the material passages 45 on the feed valve 42 and discharge valve 43 above another diversion channel 23. The feed valve 42 blocks the connection between the feed inlet 211 and the diversion channel 23, and the discharge valve 43 blocks the connection between the discharge outlet 212 and the diversion channel 23. At this time, the cleaning device 3 can be activated to clean the filter screen 24 within the diversion channel 23. In this embodiment, the feed valve 42 controls the connection between the feed inlet 211 and the diversion channel 23, and the discharge valve 43 controls the connection between the discharge outlet 212 and the diversion channel 23, allowing the two diversion channels 23 to open or close alternately. This allows for cleaning of the filter screen 24 within the diversion channel 23 without affecting the operation of the plastic pipe extruder.

[0029] When the connection between the diversion channel 23 and the inlet 211 and outlet 212 is blocked, the flow of molten raw material through the diversion channel 23 is also blocked. Then, the gas nozzle 31 can be activated to spray high-pressure inert gas, thereby cleaning the diversion channel 23 on the diversion plate 22. To clean the filter screen 24, such as... Figure 4 , Figure 5 As shown, the cleaning device 3 also includes a nozzle drive 33 and a nozzle fixing member 34. The nozzle drive 33 is fixed to the body 1 and connected to the nozzle fixing member 34. The gas nozzle 31 is fixed to the nozzle fixing member 34. The gas nozzle 31 is an airflow channel opened within the nozzle fixing member 34. The bottom of the diversion channel 23 has a nozzle moving channel 35 adapted to the nozzle fixing member 34. The nozzle fixing member 34 is placed within the nozzle moving channel 35, and the nozzle drive 33 drives the nozzle fixing member 34 to move within the nozzle moving channel 35. Figure 5 To show the nozzle moving channel 35, the nozzle drive 33 and nozzle fixing 34 are hidden.

[0030] Preferably, the nozzle drive 33 can be a cylinder, which drives the nozzle fixing member 34 to move within the nozzle moving channel 35. The number of gas nozzles 31 can be one, two, or more. The gas nozzles 31 can also be any existing high-pressure nozzle capable of injecting high-pressure inert gas, which is prior art. The gas nozzles 31 are connected to an external gas source via a pipeline, which can be equipped with a regulating valve and pressure gauge. The inert gas can be nitrogen, argon, etc.

[0031] When it is necessary to clean the diversion channel 23, the nozzle drive 33 drives the gas nozzle 31 to move towards the center of the diversion channel 23, that is... Figure 4 The nozzle moves upward, and when it reaches the predetermined position, it begins to spray high-pressure inert gas. After the diversion channel 23 is cleaned, the nozzle drive 33 drives the gas nozzle 31 downward, so that the gas nozzle 31 can be removed from the diversion channel 23.

[0032] like Figures 3 to 5 As shown, in order to control the communication between the discharge port 25 and the inside of the diversion channel 23, the cleaning device 3 also includes a discharge drive component 36. The discharge drive component 36 is fixed to the body 1 and is connected to the discharge control valve 32. The bottom of the diversion channel 23 has a valve moving channel 37 adapted to the discharge control valve 32. The valve moving channel 37 is connected to the discharge port 25, and the discharge drive component 36 drives the discharge control valve 32 to move within the valve moving channel 37. The diversion body 21 has a discharge channel 26, which is connected to the valve moving channel 37.

[0033] Preferably, the discharge drive 36 can be a cylinder, which drives the discharge control valve 32 to move up and down within the valve movement channel 37. When cleaning of the diversion channel 23 is required, the discharge drive 36 drives the discharge control valve 32 to move downward within the valve movement channel 37, and moves the discharge control valve 32 to below the connection between the discharge channel 26 and the valve movement channel 37. At this time, the cleaned waste material can enter the valve movement channel 37 through the discharge port 25, and then flow out into the discharge channel 26. After the waste material is cleaned, the discharge drive 36 drives the discharge control valve 32 to move upward, thereby blocking the discharge port 25.

[0034] In one embodiment, the top of both the discharge control valve 32 and the nozzle fixing member 34 can be configured as downwardly curved arc surfaces, which can form a complete cylindrical surface with the inner wall of the diversion channel 23. When the raw material passes through the diversion channel 23, the discharge control valve 32 and the nozzle fixing member 34 will not affect the flow of the raw material, avoiding local slowdown of flow velocity or change of original flow direction after the raw material collides with the discharge control valve 32 or the nozzle fixing member 34, which would cause irregular patterns on the extruded pipe.

[0035] During the process of backflushing the raw material containing impurities on the filter screen 24 towards the discharge port 25 through the gas nozzle 31, the molten raw material is easily backflushed onto the inner wall of the diversion channel 23 between the feed valve 42 and the diversion channel 23. The gas injected by the gas nozzle 31 is injected in a straight line when passing through the straight holes on the diversion plate 22, failing to reach the inner wall of the diversion channel 23. This results in the raw material containing impurities adhering to the inner wall of the diversion channel 23, leading to incomplete cleaning and a poor cleaning effect.

[0036] Therefore, as Figures 4 to 7 The plastic pipe extruder of this embodiment also includes a rotating device 5, which includes a rotating motor 51 and a rotating gear 52. The rotating motor 51 is fixed to the diverting body 21, and the drive shaft of the rotating motor 51 is connected to the rotating gear 52. The outer edge of the diverting plate 22 has a ring of teeth 221, and the rotating gear 52 meshes with the teeth 221. The diverting plate 22 is rotatably connected to the diverting body 21 through bearings.

[0037] In this embodiment, the rotating device 5 enables the rotating motor 51 to start, which in turn drives the flow divider plate 22 to rotate via the rotating gear 52. The airflow ejected by the gas nozzle 31 forms a rotating airflow after passing through the straight holes on the flow divider plate 22. This rotating airflow can directly act on the inner wall of the flow divider channel 23, thereby blowing the waste material attached to the inner wall of the flow divider channel 23 into the discharge port 25, thus achieving a better cleaning effect.

[0038] However, since the raw materials containing impurities are in a molten state and are quite viscous, simply relying on rotating airflow may not be able to clean them thoroughly. As a result, waste material still adheres to the inner wall of the diversion channel 23 after cleaning, and the ideal cleaning effect cannot be achieved.

[0039] like Figure 5 As shown, in order to clean the waste adhering to the inner wall of the diversion channel 23, the cleaning device 3 also includes a scraper assembly 6, which cleans the waste adhering to the inner wall of the diversion channel 23. Specifically, as... Figure 8 As shown, the scraper assembly 6 includes a rotating scraper 61 and a scraper fixing seat 62. The scraper fixing seat 62 is movably connected to the diverter plate 22. The rotating device 5 drives the diverter plate 22 and the scraper fixing seat 62 to rotate. The rotating scraper 61 is hinged to the scraper fixing seat 62 and is located between the feed valve 42 and the diverter plate 22. The scraper blade 613 of the rotating scraper 61 has an arc-shaped structure, and the rotating scraper 61 fits against the inner wall of the diverter channel 23 during rotation. Preferably, there are two rotating scrapers 61, which are evenly distributed along the circumference of the scraper fixing seat 62.

[0040] In this embodiment, the rotary motor 51 of the rotating device 5 drives the diversion plate 22 to rotate, which in turn drives the scraper fixing seat 62 and the rotating scraper 61 to rotate simultaneously. During rotation, the rotating scraper 61 comes into contact with the inner wall of the diversion channel 23, allowing it to scrape away the waste material adhering to the inner wall of the diversion channel 23. Because the gas nozzle 31 simultaneously sprays high-pressure gas during the rotation of the rotating scraper 61 and the diversion plate 22, a state is formed where the inner wall of the diversion channel 23 is cleaned by airflow while the waste material on the inner wall of the diversion channel 23 is scraped away by the rotating scraper 61, thus thoroughly cleaning and discharging the waste.

[0041] The scraper blade 613 of the rotary scraper 61 has an arc-shaped structure with a relatively large radius and a relatively gentle arc. Thus, along the direction from near the scraper holder 62 to away from the scraper holder 62, the scraper blade 613 has a gentle arc-shaped structure. After the waste material on the inner wall of the diversion channel 23 is scraped off using the rotary scraper 61, the waste material flows along the arc-shaped structure of the scraper blade 613. When one end of the rotary scraper 61 rotates to the discharge port 25, the waste material can flow into the discharge port 25 and be discharged.

[0042] Because the manifold 22 and the manifold body 21 are connected by bearings, and the rotating gear 52 meshes with the manifold 22 and is connected to the rotating motor 51, and because the screw inside the barrel 11 drives the raw material to move in a rotating motion toward the manifold 22, the rotating raw material, after entering the manifold channel 23, exerts its force on the manifold 22. Even with the locking of the rotating motor 51, it may still cause the manifold 22 and the rotating motor 51 to rotate. However, in a plastic pipe extruder, the main function of the manifold 22 is to convert the raw material, which is pushed by the screw in the barrel 11 and moves in a rotating motion toward the manifold 22, into a linear motion after passing through the manifold 22. If the manifold 22 also rotates, it may not be possible to make the raw material after passing through the manifold 22 into a linear motion, resulting in "spiral marks" on the pipe.

[0043] like Figure 5 , Figure 6 , Figure 9 As shown, a fixing device 7 is also provided on the diverter body 21 to fix the diverter plate 22. The fixing device 7 includes a fixing plate 71, which is sleeved on the diverter body 21. The inner wall of the fixing plate 71 has a fixing groove 711 that mates with the teeth 221, and the fixing plate 71 has a notch 712, in which the rotating gear 52 is located. Figure 4 As shown, multiple sealing rings 27 are fitted on the diverter plate 22, and the diverter plate 22 is sealed to the diverter body 21 and the fixed plate 71 through the sealing rings 27.

[0044] By setting a fixed plate 71, and having the fixed groove 711 on the fixed plate 71 engage with the teeth 221 on the diverter plate 22, the diverter plate 22 can be fixed when the teeth 221 are inside the fixed groove 711. In this embodiment, the diverter plate 22 is fixed simultaneously by the rotary motor 51 and the fixed plate 71, thereby preventing the rotating raw material from driving the diverter plate 22 to rotate, so that the raw material after passing through the diverter plate 22 becomes a linear motion, avoiding the appearance of "spiral marks" on the pipe. By setting a sealing ring 27, leakage of raw material through the rotating surfaces of the contact between the diverter plate 22 and the fixed plate 71, and between the diverter plate 22 and the diverter body 21, can be prevented.

[0045] Since the rotary motor 51 can drive the flow divider plate 22 to rotate, and the flow divider plate 22 and the flow divider body 21 can rotate, the rotating surface in contact between the flow divider plate 22 and the flow divider body 21 is prone to raw material leakage. Therefore, a large pressure is required to press the sealing ring 27 tightly to prevent leakage. However, after the large pressure is applied to the sealing ring 27, the friction between the sealing ring 27 and the flow divider plate 22 and the flow divider body 21 is large, making it difficult for the rotary motor 51 to drive the flow divider plate 22 to rotate. Moreover, the sealing ring 27 is easily damaged due to friction and heat, affecting its sealing performance. At the same time, although the rotary motor 51 can drive the flow divider plate 22 to rotate, it is difficult to drive the flow divider plate 22 to rotate by the rotary motor 51 after the fixed plate 71 fixes the flow divider plate 22.

[0046] To solve the above problems, such as Figure 5 , Figure 6 As shown, a pressure regulating device 8 is also provided on the diverter body 21. The pressure regulating device 8 includes a drive cylinder 81, which is connected to the fixed plate 71. The drive cylinder 81 drives the fixed plate 71 to move closer to or further away from the diverter plate 22.

[0047] When the manifold 22 needs to be fixed, the drive cylinder 81 moves the fixing plate 71 closer to the manifold 22, causing the teeth 221 on the manifold 22 to be placed in the fixing grooves 711 on the fixing plate 71, thereby fixing the manifold 22 through the fixing plate 71. When the manifold 22 needs to be rotated, the drive cylinder 81 moves the fixing plate 71 away from the manifold 22 until the teeth 221 on the manifold 22 disengage from the fixing grooves 711 on the fixing plate 71. At this time, the manifold 22 can be rotated by the rotary motor 51. After the drive cylinder 81 moves the fixing plate 71 closer to the manifold 22, the drive cylinder 81 can apply pressure to the sealing ring 27 through the fixing plate 71 to enhance the sealing effect of the sealing ring 27. When cleaning the diversion channel 23 on the diversion plate 22, the fixed plate 71 can be moved away from the diversion plate 22 by the drive cylinder 81. This allows the pressure in the diversion channel 23 to be released through the contact surface between the diversion plate 22 and the diversion body 21, making the rotation of the diversion plate 22 easier. The pressure acting on the sealing ring 27 is relatively small when the diversion plate 22 rotates, preventing the sealing ring 27 from overheating and being damaged due to large friction when the diversion plate 22 rotates.

[0048] Because of the rotating scraper 61, the raw material that is propelled in a spiral trajectory may cause the rotating scraper 61 to rotate after entering the diversion channel 23, causing the fixed rotating scraper 61 to bear a large torque, which may lead to its damage.

[0049] like Figure 8As shown, the rotating scraper 61 has a scraper fixing part 611 at its end. One side of the scraper fixing part 611 can be hinged to the scraper fixing seat 62 via a rotating shaft 612. The scraper assembly 6 also includes a movable shaft 63 and a spring 64. A movable groove 222 is provided on the diverter plate 22. One end of the movable shaft 63 is connected to the scraper fixing seat 62, and the other end of the movable shaft 63 is located in the movable groove 222, allowing the movable shaft 63 to slide within the movable groove 222. The spring 64 is sleeved on the movable shaft 63, and both ends of the spring 64 abut against the scraper fixing seat 62 and the diverter plate 22, respectively. Preferably, there are four movable shafts 63 and four springs 64. The four movable shafts 63 are evenly distributed along the circumference of the diverter plate 22.

[0050] Since the scraper fixing part 611 is hinged to the scraper fixing seat 62 via the rotating shaft 612, when the raw material advancing in a spiral trajectory drives the rotating scraper 61 to rotate, it can drive the rotating scraper 61 to rotate around the rotating shaft 612, so that after rotation, the scraper blade 613 of the rotating scraper 61 folds and is fixed on the scraper fixing seat 62. After the rotating scraper 61 is folded on the scraper fixing seat 62, the rotating scraper 61 can avoid bearing the torsional force due to the raw material acting on it.

[0051] Since the waste removal is performed with the feed valve 42 closed, the gas nozzle 31 may blow the waste towards the edge of the feed valve 42. The rotary scraper 61 also needs to remove the waste from the edge of the feed valve 42 while rotating, otherwise the waste will remain on the feed valve 42 and affect its use. Therefore, the rotary scraper 61 also needs to be able to scrape off the waste on the feed valve 42 while rotating.

[0052] With the feed valve 42 closed, the force exerted on the rotating scraper 61 by the rotating raw material disappears. As the scraper holder 62 begins to rotate, the rotating scraper 61, under the influence of inertia and friction with the inner wall of the diversion channel 23, returns from a folded state to an extended state. During this process, the distance between the feed valve 42 and the scraper holder 612 must allow the rotating scraper 61 to unfold, and the end of the rotating scraper 61 must be able to fit against the feed valve 42 after unfolding. Because of the movable shaft 63 and spring 64, the movable shaft 63 can be pushed into the movable groove 222 during the unfolding process of the rotating scraper 61, at which time the spring 64 is in a compressed state. During the unfolding and rotation of the rotating scraper 61, the waste material on the inner wall of the diversion channel 23 and the feed valve 42 can be scraped off simultaneously, making the waste cleaning more thorough.

[0053] In one embodiment, a torsion spring may also be fitted on the rotating shaft 612, so that the rotating scraper 61 can be restored to the unfolded state under the action of the torsion spring.

[0054] The cleaned waste can be discharged directly through the discharge port 25, but discarding the waste directly would waste the raw materials.

[0055] like Figure 1 , Figure 2 As shown, the plastic pipe extruder of this embodiment also includes a waste recycling device 9, which is located below the diversion body 21. The discharge port 25 is connected to the waste recycling device 9, and the waste recycling device 9 is connected to the top of the hopper 13 on the machine body 1 through the conveying pipe 91. The bottom of the hopper 13 is connected to the inside of the barrel 11.

[0056] The waste recycling device 9 can be an existing waste treatment device (waste recycling device) or a recycling assembly on an extruder.

[0057] In one embodiment, a collection box can be installed at the outlet of the discharge channel 26. The collection box is connected to a cold water tank, and the cold water tank supplies cold water to the collection box via a water pump. The waste discharged from the discharge channel 26 falls into the collection box and cools and hardens. A valve can be installed at the bottom of the collection box to control the discharge of waste. The waste can fall directly onto the conveyor belt for transport, and the conveyor belt transports the waste to the crushing box for crushing. The crushed waste can be filtered and then transported back to the hopper 13. To achieve the transport of waste, a spiral pusher can be installed in the conveying pipe 91 to transport the waste to the hopper 13. The transport, crushing, and filtering of waste are all existing technologies.

[0058] This embodiment incorporates a waste recycling device 9, which processes waste through crushing and filtration before transporting it back into the hopper 13 and then into the barrel 11. This waste recycling not only prevents raw material waste but also achieves an environmentally friendly outcome. Furthermore, the waste recycling device 9 can also be used to recycle and reuse defective pipes extruded from plastic pipe extruders. For example, if the first section of pipe extruded from a plastic pipe extruder needs to be manually cut off, the cut section can be recycled.

[0059] To monitor the pressure within the two diversion channels 23, pressure sensors can be installed on the inner walls of each diversion channel 23. When the pressure in a diversion channel 23 reaches a set threshold, indicating a blockage in the filter screen 23, the system automatically switches to the other diversion channel 23 to begin cleaning the filter screen 23 within that channel.

[0060] In one embodiment, a heating device may also be provided on the diversion body 2 to heat the interior of the diversion channel 23, preventing the waste material from hardening due to low temperature during cleaning. This heating device can be a heating device currently used on extruders, and it can be heated by an electric heating coil.

[0061] In this embodiment, when the plastic pipe extruder is in operation, the plastic raw material first enters the barrel 11 through the hopper 13, where it is melted and conveyed. At this time, one diversion channel 23 is connected to the feed inlet 211, while the other diversion channel 23 is closed. The raw material is conveyed through the feed inlet 211 to the diversion channel 23 connected to it. The molten raw material is filtered through the filter screen 24 and then conveyed to the die head 12, where it is extruded and shaped by the mold.

[0062] When the pressure within the diversion channel 23 reaches a set threshold, the feed valve 42 and discharge valve 43 are controlled to close the diversion channel 23 and simultaneously open another diversion channel 23. After the diversion channel 23 is closed, the nozzle drive 33 moves the gas nozzle 31 upward to the middle of the diversion channel 23, while the discharge drive 36 moves the discharge control valve 32 downward. Then, high-pressure inert gas is injected into the diversion channel 23 by the gas nozzle 31, while the rotary motor drives the diversion plate 22, filter screen 24, and rotary scraper 61 to rotate. The waste is simultaneously cleaned by the gas nozzle 31 and the rotary scraper 61. The cleaned waste flows into the waste recycling device 9 through the discharge port 25 and discharge channel 26, realizing the recycling of plastic waste.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions created by the present invention, and are not intended to limit the scope of protection of the present invention. 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 created by the present invention without departing from the essence and scope of the technical solutions created by the present invention.

Claims

1. A plastic pipe extruder, characterized in that, include: The machine body, on which a machine barrel and a machine head are provided; The diversion device includes a diversion body and a diversion plate. The diversion body is fixed to the machine body and is located between the discharge end of the machine barrel and the feed end of the machine head. The diversion body has a diversion channel inside, and the diversion plate is located in the diversion channel. A filter screen is provided on the diversion plate. The diversion body has a feed inlet and a discharge outlet. The feed inlet is connected to the discharge end of the machine barrel, and the discharge outlet is connected to the feed end of the machine head. The diversion channel is connected to the feed inlet and the discharge outlet. A cleaning device includes a gas nozzle and a discharge control valve. The gas nozzle is located between the outlet and the diverter plate. The gas nozzle is capable of moving up and down relative to the diverter channel. The bottom of the diverter channel has a discharge port located between the diverter plate and the inlet. The discharge control valve controls the communication between the discharge port and the interior of the diverter channel. The main body of the diversion body has two diversion channels inside, through which molten raw materials alternately pass. Each of the two diversion channels is equipped with a diversion plate and a filter screen. Both diversion channels are connected to the inlet and outlet. Each of the two diversion channels has a discharge port at its bottom. There are also two cleaning devices. Two gas nozzles are located between the outlet and the two diversion plates, respectively. Two discharge control valves control the connection between the two discharge ports and the corresponding diversion channels. The plastic pipe extruder also includes: A valve device includes a valve mounting bracket, a feed valve, a discharge valve, and a valve drive. The valve mounting bracket is fixed to the diversion body. The feed valve is located between the feed inlet and the discharge outlet, and the discharge valve is located between the discharge outlet and the gas nozzle. The feed valve and the discharge valve are connected by a valve connecting plate. The valve drive is fixed to the valve mounting bracket and connected to the valve connecting plate. The valve drive drives the valve connecting plate to move up and down. Both the feed valve and the discharge valve have material through holes. The feed inlet communicates with the diversion channel through the material through hole on the feed valve, and the discharge outlet communicates with the diversion channel through the material through hole on the discharge valve. The plastic pipe extruder also includes a rotating device, which includes a rotating motor and a rotating gear. The rotating motor is fixed on the diverter body and connected to the rotating gear. The outer edge of the diverter plate has teeth, and the rotating gear meshes with the teeth.

2. The plastic pipe extruder according to claim 1, characterized in that, The cleaning device further includes a nozzle drive and a nozzle fixing component. The nozzle drive is fixed to the body and connected to the nozzle fixing component. The gas nozzle is fixed to the nozzle fixing component. The bottom of the diversion channel has a nozzle moving channel adapted to the nozzle fixing component. The nozzle fixing component is placed in the nozzle moving channel. The nozzle drive drives the nozzle fixing component to move within the nozzle moving channel.

3. The plastic pipe extruder according to claim 1, characterized in that, The cleaning device further includes a discharge drive component, which is fixed to the machine body and connected to the discharge control valve. The bottom of the diversion channel has a valve movement channel adapted to the discharge control valve, which is connected to the discharge port. The discharge drive component drives the discharge control valve to move within the valve movement channel. The diversion body has a discharge channel, which is connected to the valve movement channel.

4. The plastic pipe extruder according to claim 1, characterized in that, The cleaning device further includes a scraper assembly, which includes a rotating scraper and a scraper fixing seat. The scraper fixing seat is movably connected to the diversion plate. The rotating device drives the diversion plate and the scraper fixing seat to rotate. The rotating scraper is hinged to the scraper fixing seat. The rotating scraper is located between the feed inlet and the diversion plate. The scraper blade of the rotating scraper has an arc-shaped structure. The rotating scraper fits against the inner wall of the diversion channel during rotation.

5. The plastic pipe extruder according to claim 1, characterized in that, The diverting body is also equipped with a fixing device and a pressure regulating device. The fixing device includes a fixing plate with a fixing groove on the inner wall that mates with the teeth. The fixing plate has a notch, and the rotating gear is located in the notch. The pressure regulating device includes a driving cylinder connected to the fixing plate. The driving cylinder drives the fixing plate to move closer to or away from the diverting plate. The diverting plate is fitted with multiple sealing rings, and the diverting plate is sealed to the diverting body and the fixing plate through the sealing rings.

6. The plastic pipe extruder according to claim 4, characterized in that, The end of the rotating scraper has a scraper fixing part, one side of which is hinged to the scraper fixing seat. The scraper assembly also includes a movable shaft and a spring. A movable groove is provided on the flow divider plate. One end of the movable shaft is connected to the scraper fixing seat, and the other end of the movable shaft is located in the movable groove. The movable shaft can slide in the movable groove. The spring is sleeved on the movable shaft, and both ends of the spring abut against the scraper fixing seat and the flow divider plate, respectively.

7. The plastic pipe extruder according to claim 1, characterized in that, The plastic pipe extruder also includes a waste recycling device located below the main body of the diversion unit. The discharge port is connected to the waste recycling device, which is connected to the top of the hopper on the machine body via a conveying pipe. The bottom of the hopper is connected to the inside of the barrel.

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