A photovoltaic PVC pipe extrusion molding process and molding device

Abstract

The invention discloses an extrusion molding process and a molding device for photovoltaic PVC pipes, comprising: feeding polychlorinated raw materials and auxiliary materials for photovoltaic purposes into a low-shear plasticizer system to form a premix; then feeding into a multi-stage linear heating furnace cavity, performing layer-by-layer melting treatment through a temperature-controlled hot mold gate, successively achieving the optimal configuration of melt fluidity and molecular orientation, and obtaining a molten base flow with global uniform fluidity; performing fine impurity removal treatment on the molten base flow through a chemical filtration device, and introducing it into a cooling box to obtain a PVC pipe; performing detection and sorting out qualified products, and cutting and storing the qualified products according to preset specifications and grades; optimizing the fluidity and molecular orientation of the melt through multi-stage linear heating and temperature control treatment, significantly improving the uniformity of the molten base flow, and combining chemical filtration and cooling temperature fine-tuning to achieve the stability of the quality of the finished product, meeting the demand for high-quality pipes for photovoltaic applications.

Description

Technical Field

[0001] The invention relates to the field of photovoltaic tubes, and in particular to an extrusion molding process and a molding device for photovoltaic PVC tubes. Background Art

[0002] With the continuous growth of global demand for renewable energy, the photovoltaic industry, as an important part of it, has increasingly higher quality and performance requirements for related supporting materials. As a key component of the photovoltaic system, photovoltaic PVC pipes are widely used in wiring protection, bracket connection and other auxiliary structures of solar panels. Since they need to be exposed to various environmental conditions outdoors for a long time, photovoltaic PVC pipes are required to have not only excellent optical transmittance and UV stability, but also high strength and good weather resistance to ensure the long-term stable operation of the photovoltaic system. Therefore, the development of high-quality and high-performance photovoltaic PVC pipe molding technology has become an important direction for the technological progress of the photovoltaic industry.

[0003] In the prior art, the extrusion molding process of photovoltaic PVC pipes usually adopts the traditional mechanical shear mixing method. Although these processes can achieve the basic molding of PVC pipes, there are many deficiencies in the actual production process. First, traditional shear mixing easily leads to uneven distribution of raw material components, affecting the optical transmission performance and mechanical strength of the pipe, and the lack of management of material melting during the preparation process leads to easy agglomeration and uneven cooling, which further affects its physical properties and service life. In addition, its traditional mechanical filtration method has limited effect on the removal of fine impurities, affecting the purity and surface smoothness of the finished pipe, resulting in poor quality of the pipe, which is difficult to meet the requirements of high-quality photovoltaic pipes.

[0004] In view of this, it is necessary to improve the photovoltaic PVC tube molding process in the prior art to solve the technical problems of uneven preparation and failure to meet high quality requirements. Summary of the invention

[0005] The purpose of the present invention is to provide an extrusion molding process and a molding device for a photovoltaic PVC pipe to solve the above technical problems.

[0006] To achieve this object, the present invention adopts the following technical solutions: A photovoltaic PVC pipe extrusion molding process, comprising: Step S1, putting the polychlorinated raw material and auxiliary materials for photovoltaic use into a low shear plasticizer system, and uniformly mixing them at a preset pressure and temperature to obtain a premix; wherein the auxiliary materials include light-transmitting particles, ultraviolet stabilizers and structural reinforcement fibers; Step S2, feeding the premix into a multi-stage linear heating furnace chamber, performing layer-by-layer melting treatment through a temperature-controlled hot mold gate, sequentially achieving an optimized configuration of melt fluidity and molecular orientation, and obtaining a molten base flow with global uniform fluidity; Step S3, removing fine impurities from the molten base flow through a chemical filtration device, and sending the filtered molten material into a shape control mold to preliminarily form a semi-molded tube; Step S4, introducing the semi-formed pipe into a cooling box, during which the surface and internal temperature of the semi-formed pipe are finely adjusted by using quantitative soft air cooling and circumferential pressure adjustment functions to achieve cooling of the pipe, thereby obtaining a PVC pipe; Step S5, inspecting the cooled PVC pipes by means of inspection equipment to select qualified products, and cutting and storing the qualified products according to preset specifications and grades.

[0007] Optionally, the polychlorinated raw material is polyvinyl chloride resin, accounting for 50-70% of the total weight; Transmitting light-transmitting particles, accounting for 10-20% of the total weight, wherein the transmitting light-transmitting particles are any one or more of silicon dioxide particles, fluoride particles or polystyrene particles; The ultraviolet stabilizer accounts for 3-7% of the total weight, wherein the ultraviolet stabilizer is any one of a benzotriazole stabilizer, a light stabilizer or a hydroxyphosphonate stabilizer; The structural reinforcement fiber is any one of glass fiber, carbon fiber or aramid fiber.

[0008] Optionally, the step S2 specifically includes: Step S21, transporting the premixture to the first heating section of the multi-section linear heating furnace chamber through a preheating transmission pipeline, and performing a preliminary melting treatment on the premixture at a heating temperature of 200-250° C. and a screw speed of 50-100 revolutions per minute in the first heating section; Step S22, the melt treated in the first heating section is continuously conveyed to the second heating section, and the temperature is gradually increased to 300-350° C. by a segmented temperature control system in the second heating section, and a screw speed of 80-120 revolutions per minute is applied, and the pressure is adjusted to 15-25 MPa to optimize the fluidity and molecular orientation of the melt; Step S23, conveying the melt processed in the second heating section to the third heating section, using a multi-stage temperature-controlled hot mold gate to control the temperature, maintaining the temperature between 350-400°C, and further improving the uniformity and molecular orientation of the molten base flow at a screw speed of 100-150 revolutions per minute.

[0009] Optionally, after step S23, the following steps are further included: Step S24, in the third heating section, introducing an inert gas to reduce the oxidation rate of the melt, and optimizing the shear rate of the molten base flow by adjusting the screw speed; In step S25, the molten base flow that has undergone multi-stage linear heating treatment passes through the final temperature section of the heat-sealing mold gate, controls the final melting temperature of the molten base flow to 400-450°C, and uses the dynamic temperature adjustment function of the mold gate to ensure that the molten base flow has global uniform fluidity when leaving the heating furnace chamber.

[0010] Optionally, the step S3 specifically includes: Step S31, precooling the molten base stream to 150-200° C. through a precooling unit; Step S32, introducing the pre-cooled molten base stream into a chemical filtration system, wherein the chemical filtration system comprises at least two stages of nanofilters with different pore sizes, which are used to remove fine impurities with particle sizes in the range of 0.1-0.5 microns and 0.5-1.0 microns respectively; Step S33, during the chemical filtration process, 0.5-1.5 weight percent of a flocculant and 0.2-0.8 weight percent of a dispersant are added to the molten base flow, and a constant pressure in the filtration system is maintained within a range of 10-20 MPa through a pressure control module; Step S34, the filtered molten base flow is transported to the shape control mold through a constant temperature transport pipe. The shape control mold is equipped with a temperature control device to maintain the temperature of the molten base flow at 180-220°C when entering the mold to initially form a semi-molded pipe.

[0011] Optionally, the step S4 specifically includes: Step S41, introducing the semi-formed pipe into a cooling box through a constant temperature conveying system, wherein the cooling box is provided with a quantitative soft air cooling device and a circumferential pressure regulating device; Step S42, in the cooling box, using the quantitative soft air cooling device to perform uniform airflow cooling on the surface of the semi-formed pipe; Step S43, at the same time, a uniform circumferential pressure is applied to the semi-formed tube by a circumferential pressure regulating device, wherein the pressure regulating device comprises an adjustable pressure roller system and a pneumatic pressure control module, and the circumferential pressure applied is in the range of 5-15 kPa.

[0012] Optionally, after step S43, the following steps are further included: Step S44, during the cooling process, the surface and internal temperature of the semi-formed pipe are monitored in real time by a thermal sensor, so that the temperature gradient of the semi-formed pipe is controlled to be no more than 5°C per meter during the cooling process; Step S45, obtaining the temperature monitoring data of the thermal sensor, and dynamically adjusting the wind speed and wind direction of the quantitative soft air cooling device and the pressure value of the circumferential pressure regulating device according to the temperature monitoring data, so as to achieve cooling of the pipe and obtain the PVC pipe.

[0013] Optionally, the step S5 specifically includes: Step S51, transporting the cooled PVC pipe to a detection system via a conveyor belt, wherein the detection system includes an optical scanning unit, a mechanical strength testing unit and a size measurement module; Step S52, collecting images of the surface of the PVC pipe by an optical scanning unit, and identifying surface defects by an image processing algorithm; Step S53, applying standardized tensile and bending loads to the PVC pipe by a mechanical strength testing unit to measure the mechanical strength of the PVC pipe; Step S54, measuring the key dimensions of the diameter, wall thickness and length of the PVC pipe through the dimension measurement module, and comparing the measured data with the preset specifications to distinguish qualified products from unqualified products, and grading and classifying qualified products according to the degree of compliance; the measured data includes surface defects, mechanical strength and key dimensions.

[0014] Optionally, after step S54, the following steps may be further performed: Step S55, the qualified products are diverted to different storage tracks and cut according to preset specifications; Step S56, the cut PVC pipes are coded and marked according to the grading results, and are packaged by an automatic packaging system, and then the finished pipes are classified and stored in corresponding storage warehouses according to specifications.

[0015] The present invention also provides an extrusion molding device for a photovoltaic PVC tube, which is used to implement the extrusion molding process of the photovoltaic PVC tube as described above, and the extrusion molding device comprises: A low shear plasticizer system is used to uniformly mix polychlorinated raw materials and auxiliary materials for photovoltaic purposes at a preset pressure and temperature to obtain a premix; A multi-stage linear heating furnace chamber connected to the low shear plasticizer system is used to feed the premix and perform layer-by-layer melting through a temperature-controlled hot mold gate to optimize melt fluidity and molecular orientation to obtain a molten base flow with global uniform fluidity; A chemical filter device is connected to the multi-stage linear heating furnace chamber, and is used to remove fine impurities from the molten base flow, and to convey the filtered molten material to the shape control mold to initially form a semi-molded tube; A shape control mold, connected to the chemical filter device, is provided with a temperature control device and is used to initially form a semi-molded tube from the filtered melt; A cooling box, the cooling box comprising a quantitative soft air cooling device and a circumferential pressure regulating device, the cooling box is used to receive the semi-formed pipe material, and cool and fine-tune the temperature of the pipe material through the quantitative soft air cooling device and the circumferential pressure regulating device to obtain a PVC pipe; Testing equipment, used to test the cooled PVC pipes and select qualified products; The cutting and storage system is connected to the detection device and is used to cut the qualified PVC pipes according to preset specifications.

[0016] Compared with the prior art, the present invention has the following beneficial effects: firstly, the polychlorinated raw material for photovoltaic use and the auxiliary materials of light-transmitting particles, ultraviolet stabilizers and structural reinforcement fibers are uniformly mixed in a low-shear plasticizer system under preset pressure and temperature conditions to form a premixed mixture, which is then fed into a multi-stage linear heating furnace cavity and melted layer by layer through a temperature-controlled hot mold gate to achieve an optimized configuration of melt fluidity and molecular orientation, and generate a molten base flow with global uniform fluidity; a chemical filter device is used to remove fine impurities in the molten base flow, and a shape-controlled mold is initially formed to form a semi-molded pipe, which is then introduced into a cooling box and cooled by quantitative soft air. The circumferential pressure adjustment function can fine-tune the surface and internal temperature of the pipe to ensure uniform stress distribution during the cooling process, and finally obtain the finished PVC pipe; the cooled PVC pipe is inspected and sorted by the detection equipment, and the qualified products are cut and stored according to the preset specifications, and the unqualified products are rejected to realize the closed-loop control of the production process; this method optimizes the fluidity and molecular orientation of the melt through multi-stage linear heating and temperature control treatment, significantly improves the uniformity of the molten base flow, and combines chemical filtration and cooling temperature fine-tuning to control the pipe surface and improve the production process of photovoltaic PVC pipes, achieving the stability of the quality of the finished products and meeting the demand for high-quality pipes in photovoltaic applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0019] Figure 1 This is one of the schematic flow diagrams of the extrusion molding process of the photovoltaic PVC tube of Example 1; Figure 2 This is the second schematic flow diagram of the extrusion molding process of the photovoltaic PVC tube of the first embodiment. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0022] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] Embodiment 1: Combination Figure 1 to Figure 2 As shown, an embodiment of the present invention provides an extrusion molding process for a photovoltaic PVC tube, comprising: Step S1, putting the polychlorinated raw material and auxiliary materials for photovoltaic use into a low shear plasticizer system, and uniformly mixing them at a preset pressure and temperature to obtain a premix; wherein the auxiliary materials include light-transmitting particles, ultraviolet stabilizers and structural reinforcement fibers; It should be noted that by uniformly mixing under preset pressure and temperature conditions to ensure that each component is fully dispersed and evenly distributed, the fluidity and processing consistency of the raw materials are improved. The application of the low shear plasticizer system effectively prevents the degradation of raw materials that may be caused by high shear force, and maintains the physical properties and chemical stability of the material.

[0024] Step S2, feeding the premix into a multi-stage linear heating furnace chamber, and performing a layer-by-layer melting process through a temperature-controlled hot mold gate, so as to achieve the optimal configuration of melt fluidity and molecular orientation in turn, and obtain a molten base flow with global uniform fluidity; The premix is ​​fed into a multi-stage linear heating furnace chamber and melted layer by layer through a temperature-controlled hot mold gate to achieve an optimal configuration of melt fluidity and molecular orientation. The multi-stage linear heating furnace chamber design allows precise temperature control of the molten base flow in different temperature zones, gradually increasing the temperature of the melt to achieve the best flow state and molecular arrangement. The temperature-controlled hot mold gate ensures that the molten base flow remains uniform and stable throughout the heating process by heating in sections and adjusting the extrusion speed, avoiding uneven flow or inconsistent molecular orientation caused by temperature fluctuations. This process significantly improves the overall uniformity and molecular orientation of the molten base flow.

[0025] Step S3, removing fine impurities from the molten base flow through a chemical filtration device, and sending the filtered molten material into a shape control mold to preliminarily form a semi-molded tube; The melted base flow is filtered through a chemical filter to remove fine impurities, and then the filtered melt is sent to a shape control mold to initially form a semi-molded pipe. The chemical filter uses multi-layer nanofiltration technology to effectively remove tiny impurities and bubbles in the melt base flow to ensure the purity and optical transparency of the pipe. The filtered melt is initially formed in a shape control mold. Through precision mold design, the initial size and shape of the pipe are controlled to ensure that the semi-molded product has good structural stability and consistent geometric parameters.

[0026] Step S4, introducing the semi-formed pipe into a cooling box, during which the surface and internal temperatures of the semi-formed pipe are finely adjusted by using quantitative soft air cooling and circumferential pressure adjustment functions to achieve cooling of the pipe and obtain a PVC pipe; The semi-formed pipe is introduced into the cooling box, during which the surface and internal temperature of the pipe are fine-tuned by quantitative soft air cooling and circumferential pressure adjustment functions to achieve uniform cooling of the pipe and obtain the final PVC pipe. The quantitative soft air cooling system ensures consistent cooling rates on the surface and inside of the pipe by precisely controlling the wind speed and air volume, preventing stress concentration and deformation caused by uneven cooling. At the same time, the circumferential pressure regulating device applies uniform pressure to maintain the roundness and wall thickness uniformity of the pipe, further ensuring the dimensional accuracy and structural stability of the finished pipe. The temperature fine-tuning process monitors the temperature distribution of the pipe in real time, and dynamically adjusts the cooling parameters according to the monitoring data to ensure that the temperature gradient of the pipe is controlled within a reasonable range during the cooling process, thereby obtaining high-quality PVC pipes with uniform cooling and balanced stress distribution.

[0027] Step S5, inspecting the cooled PVC pipes by means of inspection equipment to select qualified products, and cutting and storing the qualified products according to preset specifications and grades.

[0028] The cooled PVC pipes are fully inspected by the testing equipment, and qualified products that meet the quality standards are selected, and graded, cut and stored according to the preset specifications. The testing equipment includes an optical scanning system, a mechanical strength test device and a dimensional measurement module, which can obtain key parameters such as the surface finish, mechanical properties and dimensional accuracy of the pipe in real time. Through high-resolution image processing and automated testing, the system can quickly identify and eliminate pipes with surface defects, insufficient mechanical properties or dimensional deviations. Qualified products are classified according to their specifications and parameters, and cut to a predetermined length by high-precision cutting equipment to ensure that the length of the cut pipes is consistent and the cut surface is smooth. Finally, the cut PVC pipes are automatically coded, labeled and stored in the corresponding storage warehouse, equipped with an intelligent logistics management system to achieve orderly management and efficient deployment of finished pipes. This step ensures the high quality of finished PVC pipes and the efficiency of the production process through comprehensive quality control and automated processing, meeting the strict requirements of photovoltaic applications for high-performance pipes.

[0029] The working principle of the present invention is as follows: first, polychlorinated raw materials for photovoltaic use and auxiliary materials such as light-transmitting particles, ultraviolet stabilizers and structural reinforcement fibers are uniformly mixed in a low-shear plasticizer system under preset pressure and temperature conditions to form a premixed mixture, which is then fed into a multi-stage linear heating furnace cavity and melted layer by layer through a temperature-controlled hot mold gate to achieve an optimized configuration of melt fluidity and molecular orientation, and generate a molten base flow with global uniform fluidity; a chemical filter device is used to remove fine impurities in the molten base flow, and a shape-controlled mold is used for preliminary formation to form a semi-molded pipe, which is then introduced into a cooling box and cooled by quantitative soft air cooling and circumferential pressure regulation. The temperature control function is used to fine-tune the surface and internal temperature of the pipe to ensure uniform stress distribution during the cooling process, and finally obtain the finished PVC pipe; the cooled PVC pipe is inspected and sorted by the detection equipment, and the qualified products are cut and stored according to the preset specifications, and the unqualified products are rejected to realize the closed-loop control of the production process; this method optimizes the fluidity and molecular orientation of the melt through multi-stage linear heating and temperature control treatment, significantly improves the uniformity of the molten base flow, and combines chemical filtration and cooling temperature fine-tuning to control the pipe surface, improve the production process of photovoltaic PVC pipe, achieve the stability of the quality of the finished product, and meet the demand for high-quality pipes in photovoltaic applications.

[0030] In this embodiment, it is specifically described that the polychlorinated raw material is polyvinyl chloride resin, accounting for 50-70% of the total weight; the light-transmitting particles account for 10-20% of the total weight, wherein the light-transmitting particles are any one or more of silica particles, fluoride particles or polystyrene particles; the ultraviolet stabilizer accounts for 3-7% of the total weight, wherein the ultraviolet stabilizer is any one of benzotriazole stabilizers, light stabilizers or hydroxyphosphonate stabilizers; the structural reinforcing fibers are any one of glass fibers, carbon fibers or aramid fibers.

[0031] In this embodiment, it is specifically described that step S2 specifically includes: Step S21, transporting the premixture to the first heating section of the multi-section linear heating furnace chamber through a preheating transmission pipeline, and performing a preliminary melting treatment on the premixture at a heating temperature of 200-250° C. and a screw speed of 50-100 revolutions per minute in the first heating section; Step S22, the melt treated in the first heating section is continuously conveyed to the second heating section, and the temperature is gradually increased to 300-350° C. by a segmented temperature control system in the second heating section, and a screw speed of 80-120 revolutions per minute is applied, and the pressure is adjusted to 15-25 MPa to optimize the fluidity and molecular orientation of the melt; Step S23, conveying the melt processed in the second heating section to the third heating section, using a multi-stage temperature-controlled hot mold gate to control the temperature, maintaining the temperature between 350-400°C, and further improving the uniformity and molecular orientation of the molten base flow at a screw speed of 100-150 revolutions per minute.

[0032] Step S24, in the third heating section, an inert gas is introduced to reduce the oxidation rate of the melt, and the shear rate of the molten base flow is optimized by adjusting the screw speed to ensure that the melt maintains stable fluidity and molecular orientation during the entire heating process.

[0033] In step S25, the molten base flow that has undergone multi-stage linear heating treatment passes through the final temperature section of the heat-sealing mold gate, controls the final melting temperature of the molten base flow to 400-450°C, and uses the dynamic temperature adjustment function of the mold gate to ensure that the molten base flow has global uniform fluidity when leaving the heating furnace chamber.

[0034] In this embodiment, it is specifically described that step S3 specifically includes: Step S31, precooling the molten base stream to 150-200° C. through a precooling unit; to optimize the impurity sedimentation effect in the subsequent chemical filtration process; Step S32, introducing the pre-cooled molten base stream into a chemical filtration system, the chemical filtration system comprising at least two stages of nanofilters with different pore sizes, for removing fine impurities with particle sizes in the range of 0.1-0.5 microns and 0.5-1.0 microns, respectively; Step S33, during the chemical filtration process, 0.5-1.5 weight percent of a flocculant (e.g., polyacrylamide) and 0.2-0.8 weight percent of a dispersant (e.g., sodium dodecylbenzene sulfonate) are added to the molten base flow to enhance the aggregation and filtration efficiency of impurities; and a constant pressure in the filtration system is maintained within a range of 10-20 MPa through a pressure control module to ensure uniform passage and efficient filtration of the molten base flow; Step S34, the filtered molten base flow is transported to a shape control mold through a constant temperature transport pipeline. The shape control mold is equipped with a temperature control device to maintain the temperature of the molten base flow at 180-220° C. when entering the mold, so as to initially form a semi-molded tube. In the shape control mold, the outer dimensions and surface finish of the semi-molded tube are precisely controlled through the surface texture design of the inner wall of the mold and the synergistic effect of the internal cooling system, ensuring that the dimensional accuracy and surface quality of the molded tube meet the design requirements.

[0035] In this embodiment, it is specifically described that step S4 specifically includes: Step S41, the semi-formed pipe is introduced into a cooling box through a constant temperature conveying system, and a quantitative soft air cooling device and a circumferential pressure regulating device are provided in the cooling box to achieve stable conveying and preliminary cooling of the pipe during the cooling process; Step S42, in the cooling box, a quantitative soft air cooling device is used to perform uniform airflow cooling on the surface of the semi-formed pipe; the soft air cooling device includes multiple sets of fans with adjustable wind speed and wind direction, and the wind speed range is 10-30 m / s, ensuring that the surface temperature of the pipe is gradually reduced from 120-150°C to 80-100°C; Step S43: At the same time, a circumferential pressure regulating device is used to apply uniform circumferential pressure to the semi-formed tube, and the pressure regulating device includes an adjustable pressure roller system and a pneumatic pressure control module, and the circumferential pressure applied is in the range of 5-15 kPa, so as to prevent deformation and stress concentration of the tube during the cooling process.

[0036] Step S44, during the cooling process, the surface and internal temperature of the semi-formed pipe are monitored in real time by a thermal sensor, so that the temperature gradient of the semi-formed pipe is controlled to be no more than 5°C per meter during the cooling process; Step S45, obtaining the temperature monitoring data of the thermal sensor, and dynamically adjusting the wind speed and wind direction of the quantitative soft air cooling device and the pressure value of the circumferential pressure regulating device according to the temperature monitoring data, so as to achieve cooling of the pipe and obtain the PVC pipe.

[0037] Through the intelligent control unit, the wind speed, wind direction and circumferential pressure in the cooling box are automatically adjusted according to the data fed back by the thermal sensor, so as to achieve precise temperature fine-tuning of the semi-formed pipe, ensure uniform temperature distribution of the pipe during the cooling process, and finally obtain a PVC pipe product with uniform cooling and balanced stress distribution.

[0038] In this embodiment, it is specifically described that step S5 specifically includes: Step S51, conveying the cooled PVC pipe to a detection system through a conveyor belt, the detection system includes an optical scanning unit, a mechanical strength testing unit and a dimension measurement module; and is used to obtain detection parameters of the surface finish, mechanical strength and dimensional accuracy of the PVC pipe; Step S52, collecting images of the surface of the PVC pipe through an optical scanning unit, and identifying surface defects such as bubbles, cracks and uneven surface roughness through an image processing algorithm, to ensure that the surface quality of the pipe meets the standards; Step S53, applying standardized tensile and bending loads to the PVC pipe through a mechanical strength testing unit to measure the mechanical strength of the PVC pipe; and selecting qualified products with excellent mechanical properties; Step S54, measuring the key dimensions of the diameter, wall thickness and length of the PVC pipe by the dimension measurement module, and comparing the measured data with the preset specifications to distinguish qualified products from unqualified products, and classifying the qualified products according to the degree of compliance; the measured data includes surface defects, mechanical strength and key dimensions; Step S55, the qualified products are diverted to different storage tracks and cut according to preset specifications; Step S56, the cut PVC pipes are coded and marked according to the grading results, and are packaged by an automatic packaging system, and then the finished pipes are classified and stored in corresponding storage warehouses according to specifications.

[0039] Embodiment 2: The present invention further provides a photovoltaic PVC tube, which is manufactured by the extrusion molding process of the photovoltaic PVC tube in the first embodiment, and the photovoltaic PVC tube comprises: The low shear plasticizer system is used to uniformly mix polychlorinated raw materials and auxiliary materials for photovoltaic purposes at a preset pressure and temperature to obtain a premix.

[0040] The multi-stage linear heating furnace chamber is connected to the low shear plasticizer system, which is used to feed the premix and melt it layer by layer through the temperature-controlled hot mold gate to optimize the melt fluidity and molecular orientation to obtain a molten base flow with global uniform fluidity.

[0041] The chemical filter device is connected to the multi-stage linear heating furnace chamber to remove fine impurities from the molten base flow and transport the filtered molten material to the shape control mold to initially form a semi-molded pipe.

[0042] The shape control mold is connected to the chemical filter device and is equipped with a temperature control device for initially forming a semi-molded tube from the filtered melt.

[0043] The cooling box includes a quantitative soft air cooling device and a circumferential pressure regulating device. The cooling box is used to receive the semi-formed pipe material, and cool and fine-tune the temperature of the pipe material through the quantitative soft air cooling device and the circumferential pressure regulating device to obtain a PVC pipe.

[0044] Testing equipment, used to test the cooled PVC pipes and select qualified products; The cutting storage system is connected to the testing equipment and is used to cut the qualified PVC pipes according to the preset specifications.

[0045] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photovoltaic PVC tube extrusion molding process, characterized in that: include: Step S1, putting the polychlorinated raw material and auxiliary materials for photovoltaic use into a low shear plasticizer system, and uniformly mixing them at a preset pressure and temperature to obtain a premix; wherein the auxiliary materials include light-transmitting particles, ultraviolet stabilizers and structural reinforcement fibers; Step S2, feeding the premix into a multi-stage linear heating furnace chamber, performing layer-by-layer melting treatment through a temperature-controlled hot mold gate, sequentially achieving an optimized configuration of melt fluidity and molecular orientation, and obtaining a molten base flow with global uniform fluidity; Step S3, removing fine impurities from the molten base flow through a chemical filtration device, and sending the filtered molten material into a shape control mold to preliminarily form a semi-molded tube; Step S4, introducing the semi-formed pipe into a cooling box, during which the surface and internal temperature of the semi-formed pipe are finely adjusted by using quantitative soft air cooling and circumferential pressure adjustment functions to achieve cooling of the pipe, thereby obtaining a PVC pipe; Step S5, inspecting the cooled PVC pipes by means of inspection equipment to select qualified products, and cutting and storing the qualified products according to preset specifications and grades.

2. The extrusion molding process of photovoltaic PVC tube according to claim 1, characterized in that: The polychlorinated raw material is polyvinyl chloride resin, accounting for 50-70% of the total weight; Transmitting light-transmitting particles, accounting for 10-20% of the total weight, wherein the transmitting light-transmitting particles are any one or more of silicon dioxide particles, fluoride particles or polystyrene particles; The ultraviolet stabilizer accounts for 3-7% of the total weight, wherein the ultraviolet stabilizer is any one of a benzotriazole stabilizer, a light stabilizer or a hydroxyphosphonate stabilizer; The structural reinforcement fiber is any one of glass fiber, carbon fiber or aramid fiber.

3. The extrusion molding process of photovoltaic PVC tube according to claim 1, characterized in that: The step S2 specifically includes: Step S21, transporting the premixture to the first heating section of the multi-section linear heating furnace chamber through a preheating transmission pipeline, and performing a preliminary melting treatment on the premixture at a heating temperature of 200-250° C. and a screw speed of 50-100 revolutions per minute in the first heating section; Step S22, the melt treated in the first heating section is continuously conveyed to the second heating section, and the temperature is gradually increased to 300-350° C. by a segmented temperature control system in the second heating section, and a screw speed of 80-120 revolutions per minute is applied, and the pressure is adjusted to 15-25 MPa to optimize the fluidity and molecular orientation of the melt; Step S23, conveying the melt processed in the second heating section to the third heating section, using a multi-stage temperature-controlled hot mold gate to control the temperature, maintaining the temperature between 350-400°C, and further improving the uniformity and molecular orientation of the molten base flow at a screw speed of 100-150 revolutions per minute.

4. The extrusion molding process of photovoltaic PVC tube according to claim 3, characterized in that: After step S23, the following steps are also included: Step S24, in the third heating section, introducing an inert gas to reduce the oxidation rate of the melt, and optimizing the shear rate of the molten base flow by adjusting the screw speed; In step S25, the molten base flow that has undergone multi-stage linear heating treatment passes through the final temperature section of the heat-sealing mold gate, controls the final melting temperature of the molten base flow to 400-450°C, and uses the dynamic temperature adjustment function of the mold gate to ensure that the molten base flow has global uniform fluidity when leaving the heating furnace chamber.

5. The extrusion molding process of photovoltaic PVC tube according to claim 1, characterized in that: The step S3 specifically includes: Step S31, precooling the molten base stream to 150-200° C. through a precooling unit; Step S32, introducing the pre-cooled molten base stream into a chemical filtration system, wherein the chemical filtration system comprises at least two stages of nanofilters with different pore sizes, which are used to remove fine impurities with particle sizes in the range of 0.1-0.5 microns and 0.5-1.0 microns respectively; Step S33, during the chemical filtration process, 0.5-1.5 weight percent of a flocculant and 0.2-0.8 weight percent of a dispersant are added to the molten base flow, and a constant pressure in the filtration system is maintained within a range of 10-20 MPa through a pressure control module; Step S34, the filtered molten base flow is transported to the shape control mold through a constant temperature transport pipe. The shape control mold is equipped with a temperature control device to maintain the temperature of the molten base flow at 180-220°C when entering the mold to initially form a semi-molded pipe.

6. The photovoltaic PVC tube extrusion molding process according to claim 1, characterized in that: The step S4 specifically includes: Step S41, introducing the semi-formed pipe into a cooling box through a constant temperature conveying system, wherein the cooling box is provided with a quantitative soft air cooling device and a circumferential pressure regulating device; Step S42, in the cooling box, using the quantitative soft air cooling device to perform uniform airflow cooling on the surface of the semi-formed pipe; Step S43, at the same time, a uniform circumferential pressure is applied to the semi-formed tube by a circumferential pressure regulating device, wherein the pressure regulating device comprises an adjustable pressure roller system and a pneumatic pressure control module, and the circumferential pressure applied is in the range of 5-15 kPa.

7. The extrusion molding process of photovoltaic PVC tube according to claim 6, characterized in that: After step S43, the following steps are further included: Step S44, during the cooling process, the surface and internal temperature of the semi-formed pipe are monitored in real time by a thermal sensor, so that the temperature gradient of the semi-formed pipe is controlled to be no more than 5°C per meter during the cooling process; Step S45, obtaining the temperature monitoring data of the thermal sensor, and dynamically adjusting the wind speed and wind direction of the quantitative soft air cooling device and the pressure value of the circumferential pressure regulating device according to the temperature monitoring data, so as to achieve cooling of the pipe and obtain the PVC pipe.

8. The photovoltaic PVC tube extrusion molding process according to claim 1, characterized in that: The step S5 specifically includes: Step S51, transporting the cooled PVC pipe to a detection system via a conveyor belt, wherein the detection system includes an optical scanning unit, a mechanical strength testing unit and a size measurement module; Step S52, collecting images of the surface of the PVC pipe by an optical scanning unit, and identifying surface defects by an image processing algorithm; Step S53, applying standardized tensile and bending loads to the PVC pipe by a mechanical strength testing unit to measure the mechanical strength of the PVC pipe; Step S54, measuring the key dimensions of the diameter, wall thickness and length of the PVC pipe through the dimension measurement module, and comparing the measured data with the preset specifications to distinguish qualified products from unqualified products, and grading and classifying qualified products according to the degree of compliance; the measured data includes surface defects, mechanical strength and key dimensions.

9. The photovoltaic PVC tube extrusion molding process according to claim 8, characterized in that: After step S54, the following steps are also included: Step S55, the qualified products are diverted to different storage tracks and cut according to preset specifications; Step S56, the cut PVC pipes are coded and marked according to the grading results, and are packaged by an automatic packaging system, and then the finished pipes are classified and stored in corresponding storage warehouses according to specifications.

10. A photovoltaic PVC tube extrusion molding device, characterized in that: Used to implement the extrusion molding process of the photovoltaic PVC tube according to any one of claims 1 to 9, the extrusion molding device comprises: A low shear plasticizer system is used to uniformly mix polychlorinated raw materials and auxiliary materials for photovoltaic purposes at a preset pressure and temperature to obtain a premix; A multi-stage linear heating furnace chamber connected to the low shear plasticizer system is used to feed the premix and perform layer-by-layer melting through a temperature-controlled hot mold gate to optimize melt fluidity and molecular orientation to obtain a molten base flow with global uniform fluidity; A chemical filter device is connected to the multi-stage linear heating furnace chamber, and is used to remove fine impurities from the molten base flow, and to convey the filtered molten material to the shape control mold to initially form a semi-molded tube; A shape control mold, connected to the chemical filter device, is provided with a temperature control device and is used to initially form a semi-molded tube from the filtered melt; A cooling box, the cooling box comprising a quantitative soft air cooling device and a circumferential pressure regulating device, the cooling box is used to receive the semi-formed pipe material, and cool and fine-tune the temperature of the pipe material through the quantitative soft air cooling device and the circumferential pressure regulating device to obtain a PVC pipe; Testing equipment, used to test the cooled PVC pipes and select qualified products; The cutting and storage system is connected to the detection device and is used to cut the qualified PVC pipes according to preset specifications.

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