An energy-saving PE pipe extruder

Abstract

This invention relates to the field of extruder technology and discloses an energy-saving PE pipe extruder, including an extrusion module and a vacuum shaping module. A traction tube is provided at the inlet of the vacuum shaping module, and a waste filling module is provided between the outlet of the extrusion module and the inlet of the vacuum shaping module. By setting a waste filling module between the extrusion module and the vacuum shaping module, the hot melt waste material with uneven plasticization in the early stage of extrusion can be accurately filled into the traction tube. The above structure can simultaneously complete the waste material collection and use the residual heat of the hot melt of the waste material to achieve directional heat conduction "from the inside to the outside". Compared with the traditional "from the outside to the inside" heating, the heat transfer path is greatly shortened. The traction tube can be preheated without additional energy. It can efficiently recover the initial waste material and avoid raw material waste, and achieve the energy-saving goal of "using waste to provide heat". It can ensure that the qualified PE melt is in a suitable temperature state in advance before the traction tube carries it into the vacuum shaping module.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of extruders, in particular to an energy-saving PE pipe extruder. BACKGROUND

[0002] The PE pipe extruder is a core equipment in the field of plastic pipe production. The PE pipe extruder heats, melts and plasticizes polyethylene (PE) raw materials through an extrusion module, and then drives the plasticized PE melt into a vacuum sizing module by a traction mechanism. With the synergistic effect of vacuum adsorption force and cooling water, the melt is quickly sized into a pipe with precise dimensions and smooth surface, which is widely used in many fields such as water supply and drainage, gas transportation and municipal engineering. It is a key device for realizing the industrialized continuous production of PE pipes.

[0003] In the production process of the PE pipe extruder, at the initial stage of equipment start-up, the temperature of the core components such as the barrel and screw of the extrusion module has not yet reached the uniform and stable state required by the process. At this time, the extruded PE raw materials will form initial waste due to insufficient plasticization and temperature fluctuations. This kind of waste usually needs to be cut off in time. After the temperature and plasticization state of the PE raw materials output by the extrusion module meet the production standards, the qualified PE melt is fused with the traction pipe. The PE melt is driven into the vacuum sizing device by the traction pipe to ensure that the forming quality of the subsequent pipe meets the requirements.

[0004] However, the existing technology has many problems to be solved in the above process. On the one hand, the cut-off initial waste is in a hot melt state and has irregular shape. Even if a container is used to collect it, a large amount of waste will adhere to the inner wall of the container and between the waste due to its own stickiness. Not only is the subsequent cleaning process time-consuming and laborious, but also the processing efficiency is greatly reduced due to the accumulation of waste, increasing the difficulty and cost of raw material recycling.

[0005] On the other hand, the fusion process of the qualified PE melt and the traction pipe relies on manual operation. The operator needs to directly contact the high-temperature PE melt and the traction pipe, which has a high safety risk. The manual fusion process is time-consuming, which will cause more raw materials to be converted into waste due to the lack of timely and effective traction of the extrusion module, further exacerbating the waste of raw materials. In addition, when the PE melt is fused with the outer wall of the traction pipe, heat will be transferred to both the inside and outside of the traction pipe, resulting in low heat utilization efficiency. Moreover, due to the small friction force between the traction pipe and the PE melt, the melt and the traction pipe are prone to relative sliding. Therefore, multiple repeated operations are often required to achieve stable traction, which not only prolongs the production cycle, but also greatly increases the scrap rate of the pipe due to the temperature change and uneven stress of the melt in repeated operations, which has a significant negative impact on production efficiency and economic benefits.

[0006] To this end, the application provides an energy-saving PE pipe extruder. SUMMARY

[0007] The application aims to provide an energy-saving PE pipe extruder to solve the problems in the background art.

[0008] To achieve the above-mentioned purpose, the application provides the following technical scheme: an energy-saving PE pipe extruder, comprising an extrusion module and a vacuum sizing module, a traction pipe is arranged at the inlet of the vacuum sizing module, and a waste filling module is arranged between the outlet of the extrusion module and the inlet of the vacuum sizing module; when the waste filling module moves, the initial waste generated by the extrusion module is filled into the inside of the traction pipe, and the filling and collection of the waste are simultaneously completed, the heat remaining from the melting of the waste is used to realize directional heat conduction from the inside to the outside of the pipe wall, and the traction pipe is preheated; after preheating, the traction pipe drives the PE melt into the vacuum sizing module.

[0009] Preferably, an external temperature detector is arranged between the vacuum sizing module and the traction pipe, and the operation of the waste filling module is controlled by an external control system; the waste filling module adopts a cyclic motion mode, so that the waste is continuously filled into the inside of the traction pipe, grooves are arranged on the surface of the traction pipe for the movement of the waste filling module; a slope is arranged at the feeding end of the groove corresponding to the traction pipe, and a scraping groove is arranged on the side close to the vacuum sizing module.

[0010] Preferably, a rack is arranged outside the extrusion module, the waste filling module is installed on the rack, the slope is a slope surface inclined from the outer wall of the bottom side of the traction pipe to the inside of the groove, and the scraping groove is two strip-shaped grooves arranged along the movement direction of the waste filling module.

[0011] Preferably, a clamp is installed on the rack, and the clamp is used for clamping and positioning the traction pipe.

[0012] Preferably, when the waste filling module operates, the clamp is started and clamps the traction pipe; when the waste filling module stops, the clamp releases the traction pipe.

[0013] Preferably, the rack has an electric telescopic function, and is composed of a fixed rack and a movable rack, and the clamp is installed on the surface of the fixed rack.

[0014] Preferably, the fixed rack has a semi-open structure and has a partially missing installation avoiding area, so as to facilitate the installation and positioning of the traction pipe.

[0015] The waste filling module includes two synchronous shafts, and a synchronous belt is connected between the two synchronous shafts. Several fillers are mounted on the surface of the synchronous belt, and a drive source is mounted on the surface of the movable frame. One of the synchronous shafts is rotatably connected to the surface of the movable frame, and the other synchronous shaft is connected to the output end of the drive source. The drive source drives the synchronous shaft and the synchronous belt to move, so that the fillers move along the groove of the traction tube.

[0016] The filler consists of a base and a replacement sleeve. The base is fixedly connected to the surface of the timing belt, and the replacement sleeve is detachably installed on the surface of the base.

[0017] The waste filling module is located above the traction tube, and the groove on the surface of the traction tube is opened on its upper surface, so that the filler can fill the waste into the traction tube from top to bottom. Through the top-down filling method, the waste is naturally and evenly distributed inside the traction tube with the help of gravity.

[0018] Preferably, the traction pipe can be made of pipe material with a certain rigidity to meet the structural stability requirements during the traction process, or it can be made of the residual material cut off at the end of the PE pipe production process. This not only adapts to the traction function, but also improves the utilization rate of raw materials and enhances the energy-saving effect through recycling.

[0019] Preferably, the width of the groove on the surface of the traction tube is greater than the width of the replacement sleeve, ensuring that the filler can move smoothly along the groove, while reserving sufficient space for waste filling to ensure the amount and uniformity of waste filling.

[0020] Preferably, the external temperature detector is connected to the external control system. The external temperature detector detects the temperature of the traction pipe and the waste material in real time and transmits the temperature signal to the external control system. The external control system then precisely controls the start, stop, and movement status of the waste material filling module based on the temperature threshold.

[0021] Preferably, when the waste filling module is started, the movable frame of the machine frame drives the waste filling module to descend to the working position, so that the filler is aligned with the groove of the traction tube. When the waste filling module is closed, the movable frame drives the waste filling module to rise, away from the movement path of the traction tube and the PE melt, to prevent interference with the molding process of the PE pipe.

[0022] Preferably, after the traction pipe filled with waste is discharged along with the PE pipe production process, the traction pipe can be removed from the PE pipe. The traction pipe filled with waste can be used as raw material to be put back into the extrusion production of PE pipe, realizing the recycling of waste.

[0023] Preferably, the replacement sleeve can be replaced as needed according to the shape, viscosity and other characteristics of the waste, so that the filler can be adapted to the waste filling requirements under different working conditions, thereby improving the versatility and flexibility of the device.

[0024] Preferably, the inclined portion and scraper groove of the traction tube can be precisely processed by back-end processing equipment such as pipe cutting machine and trimming machine. If the processing accuracy requirement is not high, it can also be manually corrected to adapt to the processing accuracy and cost control requirements of different production scenarios.

[0025] Preferably, the scraping groove is formed as two strip grooves on the surface of the traction tube, which divides the traction tube into a strip structure with one end fixed and the other end movable. The strip structure is integrally formed with the wall of the traction tube. The side closer to the extrusion module is the movable end, and the side farther away from the extrusion module is the fixed end. When the filler moves along the groove and passes through the scraping groove, the movable end can closely fit the surface of the filler and scrape and clean the residual waste on its surface through elastic contact.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In view of the drawbacks of the prior art in which the waste material in the early stage of extrusion is directly cut off and discarded and the preheating of the traction tube depends on external energy consumption, the present invention sets a waste material filling module between the extrusion module and the vacuum shaping module, which can accurately fill the hot melt waste material with uneven plasticization in the early stage of extrusion into the interior of the traction tube. This design simultaneously completes the waste material collection and uses the residual heat of the waste material to achieve directional heat conduction "from the inside to the outside". Compared with the traditional "from the outside to the inside" heating, the heat transfer path is greatly shortened. The traction tube can be preheated without additional energy, which not only efficiently recovers the initial waste material and avoids the waste of raw materials, but also achieves the energy-saving goal of "using waste to provide heat". This allows the traction tube to have the appropriate temperature state in advance before it carries the qualified PE melt into the vacuum shaping module.

[0027] 2. In existing technologies, the hot melt waste from the initial stage of extrusion is irregular in shape and highly viscous, making it easy to adhere to containers or stick together after collection, which is extremely difficult to clean and reuse. The waste filling module of this device uses a cyclical motion, in conjunction with the grooves on the surface of the traction tube, to continuously and orderly fill the waste into the traction tube, replacing the traditional "container collection". During filling, the inclined part of the feed end of the groove of the traction tube guides the waste to slide in smoothly and avoids accumulation. After filling is completed, the traction tube is discharged with the tube process. Subsequently, it can be removed from the finished tube, and the waste inside can be directly returned to the extrusion production without additional cleaning or separation, which greatly simplifies the waste recycling process and significantly improves the efficiency and convenience of raw material reuse.

[0028] 3. In traditional processes, the manual fusion of qualified PE melt and the traction tube poses serious safety hazards—operators need to come into contact with the high-temperature melt and the traction tube, and manual fusion is time-consuming, easily leading to more raw materials becoming waste. This device uses an external temperature detector linked to the control system to automatically control the start and stop of the waste filling module; at the same time, the clamps on the frame will automatically clamp the traction tube during waste filling, without manual intervention. When the waste filling is completed and the traction tube is preheated, the traction tube can directly carry the qualified PE melt into the vacuum shaping module. The entire process is automated, which not only eliminates the safety risks of manual operation, but also significantly shortens the fusion time, reduces the increase in waste caused by human delay, and improves production efficiency and raw material utilization.

[0029] 4. In traditional manual fusion, the PE melt adheres to the outer wall of the traction tube, resulting in low utilization efficiency due to bidirectional heat transfer. Furthermore, the low friction between the two leads to easy relative sliding, requiring multiple operations and increasing the scrap rate of the pipe. In this device, the filler inserts waste material into the traction tube from top to bottom, forming a "pipe-material integrated" structure. This structure significantly increases friction when in contact with the subsequent qualified PE melt, resulting in more stable traction. At the same time, the directional heat conduction of the waste material "from the inside out" makes the temperature distribution of the traction tube wall more uniform, reducing the thermal stress between the melt and the traction tube. This effectively reduces the probability of defects such as cracking and deformation after pipe forming, significantly improving the yield and ensuring the economy and stability of production.

[0030] 5. Considering the differences in waste form and viscosity under different production scenarios, as well as the wear and tear of components after long-term use of the equipment, the filler of this device adopts a "base + detachable replacement sleeve" structure. During production, the replacement sleeve can be replaced as needed according to the characteristics of the waste, so that the filler can adapt to the waste filling needs of various working conditions and improve the versatility of the device. When the replacement sleeve is worn due to long-term scraping and adhesion of waste, only the replacement sleeve needs to be replaced, without disassembling the entire filler or even the waste filling module, which greatly simplifies the maintenance process and reduces the time and cost of equipment maintenance.

[0031] 6. The frame, serving as the mounting carrier for the waste filling module and fixtures, features an electric telescopic function and consists of a fixed frame and a movable frame. When the waste filling module is started, the movable frame lowers the module to the working position, ensuring the filler is precisely aligned with the groove of the traction tube, thus guaranteeing accurate filling. After filling, the movable frame raises the module, moving it away from the movement path of the traction tube and the PE melt, completely avoiding interference with subsequent pipe forming. In addition, the fixed frame adopts a semi-open installation clearance area design, facilitating rapid installation and positioning of the traction tube, further improving the ease of equipment operation and production preparation efficiency, and enabling the various components of the device to work together more efficiently and systematically. Attached Figure Description

[0032] Figure 1 This is a partial three-dimensional frontal view of the main structure of the present invention.

[0033] Figure 2 This is a partial planar schematic diagram of the main structure of the present invention.

[0034] Figure 3 This is a partial perspective view of the extrusion module, vacuum shaping module, and waste filling module of the present invention.

[0035] Figure 4 This is a partial three-dimensional schematic diagram of the traction tube of the present invention.

[0036] Figure 5 This is a three-dimensional disassembly diagram of the filler component of the present invention.

[0037] Figure 6 This is a three-dimensional schematic diagram of the relationship between the waste filling module and the frame of the present invention.

[0038] Figure 7 For the present invention Figure 6 Enlarged 3D structural diagram at point A.

[0039] Figure 8 This is a partial three-dimensional schematic diagram of the main structure of the present invention.

[0040] In the diagram: 1. Extrusion module; 2. Vacuum shaping module; 3. Traction tube; 31. Inclined section; 32. Scraper groove; 4. Waste filling module; 41. Synchronous shaft; 42. Synchronous belt; 43. Filler; 431. Base; 432. Replacement sleeve; 44. Drive source; 5. Frame; 51. Fixed frame; 52. Movable frame; 6. Fixture. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0042] It should be noted that the extrusion module 1 in this device only provides the functions of PE raw material melting and plasticizing and extrusion (the raw material is made into a hot melt state by screw rotation and barrel heating and then pushed out). The vacuum shaping module 2, in addition to providing the functions of PE pipe blank vacuum adsorption shaping and cooling (the pipe blank is attached to the shaping sleeve by creating negative pressure through vacuuming, and rapid cooling and solidification is achieved by cooling water), also has the function of rear pipe conveying (the shaped PE pipe is continuously moved to the rear end by internal rollers or traction mechanism). The frame 5 only provides installation support and electric lifting and adjustment functions (providing the installation benchmark for the waste filling module 4, clamp 6, etc., and driving the waste filling module 4 to rise and fall by the electric extension and retraction of the movable frame 52 to realize the switching between the working position and the avoidance position). The temperature detector only provides temperature detection function (sensing the temperature of the traction tube 3 and waste material through a thermistor and outputting an electrical signal), and the external control system only provides signal reception and equipment linkage control function (after receiving the temperature signal, controlling the start and stop of the waste material filling module 4, clamp 6, etc. according to preset logic). The working principle of the above components (such as screw extrusion drive, vacuum negative pressure generation and tube traction, electric lifting mechanism drive, thermistor temperature measurement, PLC program control, etc.) and specific structure (such as extruder screw length-to-diameter ratio design, vacuum shaping box sealing and traction structure, frame 5 telescopic component structure, temperature detector probe encapsulation, control system circuit topology, etc.) are all existing technologies. Given the universality of these structures, their specific principles will not be described in detail later.

[0043] Please see Figures 1 to 8 The present invention provides an embodiment of an energy-saving PE pipe extruder, comprising an extrusion module 1 and a vacuum shaping module 2, wherein a traction pipe 3 is provided at the inlet of the vacuum shaping module 2, and a waste filling module 4 is provided between the outlet of the extrusion module 1 and the inlet of the vacuum shaping module 2.

[0044] When the waste filling module 4 moves, it fills the initial waste generated by the extrusion module 1 into the traction tube 3, and simultaneously completes the filling and collection of waste. It utilizes the residual heat of the hot melt to conduct heat from the inside to the outside through the tube wall, thereby preheating the traction tube 3.

[0045] After preheating, the traction tube 3 drives the PE melt into the vacuum shaping module 2.

[0046] It should be noted that an external temperature detector is installed between the vacuum shaping module 2 and the traction tube 3, and the operation of the waste filling module 4 is controlled by an external control system. The waste filling module 4 adopts a cyclical motion to continuously fill the waste into the traction tube 3. The surface of the traction tube 3 has grooves for the movement of the waste filling module 4. The feed end of the traction tube 3 corresponding to the groove has an inclined part 31, and a scraping groove 32 is provided on the side near the vacuum shaping module 2. The extrusion module 1 is equipped with a frame 5, and the waste filling module 4 is mounted on the frame 5. The inclined section 31 is a slope that slopes from the bottom outer wall of the traction pipe 3 into the groove. The scraper groove 32 consists of two strip-shaped grooves opened along the movement direction of the waste filling module 4. A clamp 6 is installed on the frame 5. The clamp 6 is used to clamp and position the traction pipe 3. When the waste filling module 4 is running, the clamp 6 starts and clamps the traction pipe 3; when the waste filling module 4 stops, the clamp 6 releases the traction pipe 3. The frame 5 has an electric telescopic function and consists of a fixed frame 51 and a movable frame 52. The clamp 6 is installed on the surface of the fixed frame 51, which is semi-open. The structure features a partially missing installation clearance area, facilitating the installation and positioning of the traction pipe 3. The waste filling module 4 includes two synchronous shafts 41, with a synchronous belt 42 connecting them. Several filler elements 43 are mounted on the surface of the synchronous belt 42. A drive source 44 is mounted on the surface of the movable frame 52. One synchronous shaft 41 is rotatably connected to the surface of the movable frame 52, while the other synchronous shaft 41 is connected to the output end of the drive source 44. The drive source 44 drives the synchronous shaft 41 and the synchronous belt 42 to move, causing the filler elements 43 to move along the traction pipe. The groove movement of 3, the filling component 43 is composed of a base 431 and a replacement sleeve 432. The base 431 is fixedly connected to the surface of the synchronous belt 42, and the replacement sleeve 432 is detachably installed on the surface of the base 431. The waste filling module 4 is located above the traction tube 3, and the groove on the surface of the traction tube 3 is opened on its upper surface, so that the filling component 43 can fill the waste into the traction tube 3 from top to bottom. Through the top-down filling method, the waste is naturally and evenly distributed inside the traction tube 3 with the help of gravity. The drive source 44 is specifically a motor.

[0047] It is worth noting that the traction pipe 3 can be made of pipe with a certain rigidity to meet the structural stability requirements during the traction process, or the scrap pipe material cut off at the rear end during the production of PE pipe can be used directly. This not only adapts to the traction function, but also improves the utilization rate of raw materials through recycling and enhances the energy-saving effect. The groove width on the surface of the traction pipe 3 is greater than the width of the replacement sleeve 432, ensuring that the filler 43 can move smoothly along the groove, while reserving sufficient space for waste filling to ensure the amount and uniformity of waste filling. The external temperature detector is connected to the external control system. The external temperature detector detects the temperature of the traction pipe 3 and the waste in real time and transmits the temperature signal to the external control system. The external control system accurately controls the start, stop and movement status of the waste filling module 4 according to the temperature threshold. When the waste filling module 4 is started, the movable frame 52 of the frame 5 drives the waste filling module 4 to descend to the working position, so that the filler 43 is aligned with the groove of the traction pipe 3. When the waste filling module 4 is closed, the movable frame 52 drives the waste filling module 4 to rise away from the movement path of the traction pipe 3 and the PE melt to prevent interference with the molding process of the PE pipe. The traction is completed after the waste is filled. After pipe 3 is discharged along with the PE pipe production process, the traction pipe 3 can be removed from the PE pipe. The traction pipe 3 filled with waste material can be reused as raw material in the extrusion production of PE pipe, realizing the recycling of waste material. The replacement sleeve 432 can be replaced as needed according to the shape, viscosity and other characteristics of the waste material, so that the filler 43 can be adapted to the waste filling requirements under different working conditions, improving the versatility and flexibility of the device. The inclined part 31 and scraper groove 32 of the traction pipe 3 can be precisely processed by the downstream processing equipment such as pipe cutting machine and trimming machine. If the processing accuracy requirement is not high, the replacement sleeve 43 can be replaced as needed. It can also be manually corrected to adapt to the processing accuracy and cost control requirements of different production scenarios. The scraping groove 32 is two strip grooves opened on the surface of the traction tube 3. It divides the traction tube 3 into a strip structure with one end fixed and the other end movable. The strip structure is integrally formed with the tube wall of the traction tube 3. The side closer to the extrusion module 1 is the movable end, and the side farther away from the extrusion module 1 is the fixed end. When the filler 43 moves along the groove and passes through the scraping groove 32, the movable end can closely fit the surface of the filler 43 and scrape and clean the residual waste on its surface through elastic contact.

[0048] Specifically, the operator first inserts the traction pipe 3 into the inlet of the vacuum shaping module 2. The traction pipe 3 selected here can be made directly from the residual material of the PE pipe produced at the end, without the need for additional special pipe customization. This not only greatly reduces the cost of raw materials, but also enhances the energy-saving effect through recycling. At the same time, its inherent rigidity can meet the structural stability requirements of the subsequent traction process.

[0049] After the installation of the traction pipe 3 is completed, the extrusion module 1 is started. In the initial stage of the extrusion module 1, the raw material discharged is the initial waste because the melt temperature has not reached the qualified molding standard. At this time, there is no need to manually clean up the waste. Only the waste filling module 4 needs to be started by triggering the external control system.

[0050] As the waste filling module 4 starts, the clamp 6 on the frame 5 starts simultaneously and clamps the traction tube 3. The clamp 6 can firmly fix the traction tube 3, avoiding the lateral force generated by the movement of the filler 43 during the subsequent filling process, which would cause the traction tube 3 to tilt, thus ensuring the accuracy of the filling path. At the same time, the movable frame 52 of the frame 5 drives the waste filling module 4 to descend to the working position, so that the filler 43 is accurately aligned with the groove on the upper surface of the traction tube 3, which not only ensures the filling efficiency, but also avoids the filler 43 from colliding and being damaged with the traction tube 3.

[0051] Subsequently, the drive source 44 starts, driving the synchronous shaft 41 to rotate. The synchronous shaft 41 further drives the synchronous belt 42 to circulate. The filler 43 on the surface of the synchronous belt 42 moves along the groove of the traction tube 3. The inclined part 31 at the feed end of the groove of the traction tube 3 can guide the initial waste material to slide smoothly into the groove, avoiding the accumulation of waste material at the groove entrance.

[0052] It should be noted that during long-term use, the replacement sleeve 432 on the filler 43 can be quickly removed and replaced with a suitable model, without the need to replace the entire filler 43, which greatly improves the versatility and maintenance efficiency of the device.

[0053] When the filler 43 moves to the side close to the vacuum shaping module 2, the scraper groove 32 on the surface of the traction tube 3 begins to function: the scraper groove 32 consists of two strip grooves that divide the traction tube 3 into a strip structure with "one end fixed and one end movable". The movable end close to the extrusion module 1 is in close contact with the surface of the filler 43 through elastic contact, scraping off the residual waste on its surface during the continuous movement of the filler 43, so as to avoid the residual waste from affecting the subsequent filling accuracy.

[0054] At the same time, the external temperature detector between the vacuum shaping module 2 and the traction tube 3 detects the temperature of the traction tube 3 and the internal waste material in real time, and transmits the temperature signal to the external control system.

[0055] When the temperature reaches the preset threshold, the external control system immediately triggers the waste filling module 4 to stop running. The clamp 6 simultaneously releases the traction pipe 3, and the movable frame 52 of the frame 5 drives the waste filling module 4 to rise, away from the movement path of the traction pipe 3 and the PE melt, so as to completely avoid interference with the subsequent PE pipe forming.

[0056] It should be noted that the traction tube 3 uses the residual heat from the hot melting of waste materials to complete the preheating process of "directional heat conduction from the inside out," which is superior to the existing technology of "heat conduction from the outside in." There are three main reasons for this: First, the heat transfer is more efficient. Existing technology requires heating the outer wall of the traction tube 3 before penetrating the tube wall. During this process, the heat is easily lost to the environment. However, the waste material directly adheres to the inner wall of the traction tube 3, and the heat does not need to penetrate the tube wall. The heat transfer path is shortened by more than 80%, and the preheating speed is more than 1.5 times faster.

[0057] Secondly, the preheating is more uniform. External heating is prone to local temperature differences in the pipe wall due to equipment precision, while the internal waste material wraps the inner wall 360°, and the heat diffuses from the inside to the outside. The temperature difference in the pipe wall can be controlled within 5℃, avoiding the impact of temperature difference stress on pipe forming.

[0058] Third, it is more energy-efficient. Existing technologies require additional heating equipment, while this solution fully utilizes the waste heat without requiring additional energy consumption, perfectly matching the core positioning of "energy-saving".

[0059] At this point, the preheated traction tube 3 begins to carry the qualified PE melt into the vacuum shaping module 2. Because the traction tube 3 is filled with waste material, it forms a "tube-material integrated" structure. This not only increases the contact friction with the PE melt and makes the traction process more stable, but also makes the overall temperature distribution of the traction tube 3 more uniform, reducing the temperature difference stress between the PE melt and the traction tube 3, effectively reducing the risk of cracking after the pipe is formed, and significantly improving the yield.

[0060] Meanwhile, the initial waste is completely collected and utilized, eliminating the need to cut long sections of waste as in traditional processes, thus significantly reducing the number of waste sections and further achieving energy conservation and consumption reduction.

[0061] After the PE pipe is formed and discharged along with the traction pipe 3, the operator only needs to remove the traction pipe 3 from the PE pipe. The traction pipe 3 filled with waste material can be directly used as raw material to be put back into the extrusion module 1 for reprocessing, realizing the full-process recycling of waste material and truly achieving the closed-loop energy-saving effect of "collection-preheating-recycling".

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving PE pipe extruder comprising an extrusion module (1) and a vacuum sizing module (2), a traction pipe (3) being arranged at the inlet of the vacuum sizing module (2), characterized in that: The outlet of the extrusion module (1) is provided with a waste filling module (4) between the inlet of the vacuum shaping module (2); When the waste filling module (4) moves, the initial waste produced by the extrusion module (1) is filled into the traction pipe (3), and the filling and collection of the waste are simultaneously completed, the heat of the waste is used for directional heat conduction from the inside to the outside of the pipe wall, and the preheating of the traction pipe (3) is realized; After preheating, the traction pipe (3) drives the PE melt into the vacuum shaping module (2); An external temperature detector is arranged between the vacuum shaping module (2) and the traction pipe (3), and the operation of the waste filling module (4) is controlled through an external control system; The waste filling module (4) adopts a circulating motion mode, so that the waste is continuously filled into the traction pipe (3), and the surface of the traction pipe (3) is provided with a groove for the movement of the waste filling module (4); The traction pipe (3) is provided with a slope (31) at the inlet of the groove corresponding to the groove, and a scraping groove (32) is arranged on the side close to the vacuum shaping module (2); The extrusion module (1) is provided with a rack (5), the waste filling module (4) is installed on the rack (5), the slope (31) is a slope surface inclined from the bottom side of the outer wall of the traction pipe (3) to the inside of the groove, and the scraping groove (32) is two strip-shaped grooves opened along the movement direction of the waste filling module (4); The rack (5) has an electric telescopic function and is composed of a fixed frame (51) and a movable frame (52); The waste filling module (4) comprises two synchronous shafts (41), the two synchronous shafts (41) are transmissionally connected with a synchronous belt (42), the surface of the synchronous belt (42) is provided with a plurality of filling pieces (43), and the surface of the movable frame (52) is provided with a driving source (44); One of the synchronous shafts (41) is rotationally connected to the surface of the movable frame (52), and the other synchronous shaft (41) is connected with the output end of the driving source (44), so that the synchronous shaft (41) and the synchronous belt (42) are driven to move by the driving source (44), and the filling pieces (43) move along the groove of the traction pipe (3).

2. The energy-saving PE pipe extruder according to claim 1, characterized in that: A clamp (6) is installed on the rack (5), and the clamp (6) is used for clamping and positioning the traction pipe (3).

3. The energy-saving PE pipe extruder according to claim 2, characterized in that: When the waste filling module (4) operates, the clamp (6) is started and clamps the traction pipe (3); When the waste filling module (4) stops, the clamp (6) releases the traction pipe (3).

4. The energy-saving PE pipe extruder according to claim 3, characterized in that: The clamp (6) is installed on the surface of the fixed frame (51).

5. The energy-saving PE pipe extruder according to claim 4, characterized in that: The fixed frame (51) is a semi-open structure and has a partially missing installation avoiding area, so as to facilitate the installation and positioning of the traction pipe (3).

6. The energy-saving PE pipe extruder according to claim 1, characterized in that: The filling piece (43) is composed of a base (431) and a replacement sleeve (432), the base (431) is fixedly connected to the surface of the synchronous belt (42), and the replacement sleeve (432) is detachably installed on the surface of the base (431).

7. The energy-saving PE pipe extruder according to claim 6, characterized in that: The waste filling module (4) is located above the traction pipe (3) as a whole, and the groove on the surface of the traction pipe (3) is arranged on the upper surface, so that the filling piece (43) can fill the waste into the inside of the traction pipe (3) from top to bottom. Through the filling mode from top to bottom, the gravity is used to assist the waste to be naturally and uniformly distributed in the inside of the traction pipe (3).

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