AGR pipe extrusion production equipment

Abstract

The invention provides AGR pipe extrusion production equipment, and mainly relates to the technical field of pipe production. The AGR pipe extrusion production equipment comprises a raw material mixing device and an extrusion molding device, the raw material mixing device is arranged on the extrusion molding device, the raw material mixing device comprises a mixing tank, a stirring device is arranged in the mixing tank, and a discharge port is formed in the bottom of the mixing tank; the extrusion molding device comprises a supporting table, an extrusion driving device is fixedly installed on the supporting table, an extrusion barrel is fixedly installed on the supporting table, double screws are rotationally installed in the extrusion barrel, the extrusion driving device drives the double screws to rotate, and the discharging opening is connected with the upper portion of the extrusion barrel. And the end part of the extrusion cylinder is connected with an extrusion driving device. The AGR pipe extrusion production equipment can solve the problem of unstable product quality caused by the conditions of non-uniform raw material mixing, insufficient extrusion plasticization and the like of the existing AGR pipe extrusion production equipment.

Description

Technical Field

[0001] This invention mainly relates to the field of pipe manufacturing technology, specifically an AGR pipe extrusion production equipment. Background Technology

[0002] AGR pipes, or acrylic copolymer polyvinyl chloride pipes, possess advantages such as high strength, high toughness, and strong corrosion resistance, and are widely used in building water supply and drainage, municipal water supply and drainage, and other fields. AGR pipes are typically produced using extrusion molding. However, existing AGR pipe extrusion production equipment suffers from the following problems in actual use: First, uneven raw material mixing. AGR pipe production requires mixing multiple raw materials in specific proportions. Existing mixing mechanisms often employ single-spiral stirring, which easily leads to stratification of the raw materials during mixing, resulting in uneven raw material composition and affecting the physical properties of the pipe. Second, unreasonable screw and barrel designs in the extrusion mechanism result in poor plasticization of the raw materials within the barrel and unstable extrusion pressure, leading to poor uniformity of pipe wall thickness, affecting the pipe's service life, and hindering the improvement of production efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an AGR pipe extrusion production equipment. By optimizing the raw material mixing structure, extrusion transmission system, and heating control method, it achieves uniform mixing of multi-component raw materials and gentle and precise plasticization of AGR resin. At the same time, it improves the equipment's adaptability to pipes of different specifications, reduces raw material waste, and ensures the stability of pipe quality.

[0004] To achieve the above objectives, the present invention employs the following technical solution: An AGR pipe extrusion production equipment includes a raw material mixing device and an extrusion molding device. The raw material mixing device is mounted on the extrusion molding device and includes a mixing tank with a stirring device inside. The bottom of the mixing tank has a discharge port. The extrusion molding device includes a support platform with an extrusion drive device fixedly mounted on it. An extrusion cylinder is also fixedly mounted on the support platform. A twin screw is rotatably mounted in the extrusion cylinder, and the extrusion drive device drives the twin screw to rotate. The discharge port is connected to the upper part of the extrusion cylinder, and the end of the extrusion cylinder is connected to the extrusion drive device. An extrusion shaping port is fixedly mounted at the end of the extrusion cylinder away from the extrusion drive device. Several zoned heating components are provided on the outside of the extrusion cylinder.

[0005] Furthermore, the stirring device includes a stirring shaft, on which several support plates are fixedly connected. An inner spiral is fixedly connected to the support plates, and an outer spiral is fixedly connected to the outer end of the support plates. A separator is provided between the outer spiral and the inner spiral, and the separator is fixedly connected to the support plates. The outer spiral and the inner spiral have opposite spiral directions. A scraper is fixedly connected to the bottom of the stirring shaft and the support plates.

[0006] Furthermore, the mixing tank is provided with an insulation layer on the outside, a heating component is provided on the inside of the insulation layer, several support columns are provided at the bottom of the mixing tank, and a material addition port, a vacuum tube interface, and a stirring drive device are provided at the top of the mixing tank. The heating component includes a heating spiral tube, and a heat transfer medium addition pipe and a heat transfer medium discharge pipe are provided at the end of the heating spiral tube.

[0007] Furthermore, the stirring drive device includes a stirring drive motor and a worm gear reducer. The worm gear reducer is fixedly installed on the top of the mixing tank, and the output shaft of the worm gear reducer is connected to the stirring device.

[0008] Furthermore, the extrusion drive device includes an extrusion drive motor, the output shaft of which is connected to a planetary gear reducer, and a drive bevel gear is mounted on the output shaft of the planetary gear reducer, which drives the twin screw to rotate.

[0009] Furthermore, the twin screw includes two screws with helical blades. One end of the twin screw is the driving end, and a driven bevel gear is fixedly provided on the driving end screw. The driven bevel gears of the two screws mesh together. A transmission bevel gear is fixedly provided on the outer end of one of the driven bevel gears. The transmission bevel gear meshes with the driving bevel gear. The end of the twin screw away from the driving end is the extrusion end. The distance between the axes of the two screws gradually decreases from the driving end to the extrusion end, and the pitch of the helical blades gradually increases. The cavity inside the extrusion barrel is adapted to the outer edge of the helical blades.

[0010] Compared with the prior art, the beneficial effects of the present invention are: Significantly improved mixing uniformity: Adopting a "double spiral + partition cylinder" composite stirring structure, combined with bidirectional convection and scraper design, the material mixing uniformity deviation is ≤3%, the additive dispersion qualification rate is ≥99%, and the material residue rate at the bottom of the tank is ≤1%, solving the stratification and residue problems of traditional single spiral stirring.

[0011] Precise and controllable plasticization quality: The twin-screw variable spacing and variable pitch design, combined with the zoned heating components, achieves gentle plasticization of AGR resin, with a copolymer structure degradation rate of ≤1%, extrusion pressure fluctuation of ≤±3 bar, pipe wall thickness deviation controlled within ±0.15 mm, and mechanical property stability improved by more than 20%. All of the above performance indicators have been tested and verified according to GB / T18993.2-2003 "Chlorinated Polyvinyl Chloride (PVC-C) Piping Systems for Hot and Cold Water - Part 2: Pipes" standard.

[0012] High equipment adaptability: The detachable extrusion molding port supports the production of multiple specifications of pipes without the need to replace the entire molding component, making operation convenient and reducing equipment investment costs by 30%; the integrated layout reduces space occupation and adapts to different workshop layout needs.

[0013] Production efficiency and economy optimization: mixing time is reduced by 40%, extrusion efficiency is increased by 25%, and scrap rate is ≤0.5% after 24 hours of continuous operation; low raw material residue rate reduces waste, while zoned heating and precise temperature control reduce energy consumption, and unit product production cost is reduced by 15%~20%. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall first-view structure of the present invention; Figure 2 This is a schematic diagram of the overall second-view structure of the present invention; Figure 3 This is a first-view structural schematic diagram of the stirring device of the present invention; Figure 4 This is a second-view structural schematic diagram of the stirring device of the present invention; Figure 5 This is a schematic diagram of the twin-screw structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the planetary gear reducer of the present invention; Figure 7 This is a schematic diagram of the side structure of the planetary gear reducer of the present invention; Figure 8 This is a schematic diagram of the heating component structure of the present invention.

[0015] The following are the labels in the attached diagram: 1. Raw material mixing device; 2. Extrusion molding device; 10. Stirring device; 11. Mixing tank; 12. Insulation layer; 13. Heating component; 14. Support column; 15. Material adding port; 16. Vacuum tube interface; 17. Stirring drive device; 20. Zoned heating component; 21. Support platform; 22. Extrusion drive device; 23. Extrusion cylinder; 24. Twin screw; 25. Extrusion shaping nozzle; 61. Motor output shaft; 62. First stage input gear; 63. First stage planetary gear; 64. Bracket one; 65. Drive shaft; 66. 67. External gear ring; 68. Second-stage input gear; 69. Second-stage planetary gear; 101. Support bracket II; 102. Stirring shaft; 103. Support plate; 104. Internal spiral; 105. External spiral; 106. Divider cylinder; 131. Scraper; 132. Heating spiral tube; 133. Heat transfer medium addition tube; 134. Heat transfer medium discharge tube; 171. Stirring drive motor; 172. Worm gear reducer; 221. Extrusion drive motor; 222. Planetary gear reducer; 223. Drive bevel gear; 241. Driven bevel gear; 242. Transmission bevel gear. Detailed Implementation

[0016] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0017] Combined with appendix Figures 1-8 An AGR pipe extrusion production equipment includes a raw material mixing device 1 and an extrusion molding device 2. The raw material mixing device 1 is mounted on the extrusion molding device 2 and includes a mixing tank 11. The mixing tank 11 is equipped with a stirring device 10 and has a discharge port at its bottom. The extrusion molding device 2 includes a support platform 21, on which an extrusion drive device 22 is fixedly mounted. An extrusion cylinder 23 is fixedly mounted on the support platform 21, and a twin screw 24 is rotatably mounted in the extrusion cylinder 23. The extrusion drive device 22 drives the twin screw 24 to rotate. The discharge port is connected to the upper part of the extrusion cylinder 23, and the end of the extrusion cylinder 23 is connected to the extrusion drive device 22. An extrusion shaping port 25 is fixedly mounted at the end of the extrusion cylinder 23 away from the extrusion drive device 22. Several zone heating components 20 are provided on the outside of the extrusion cylinder 23. The extrusion shaping port 25 can be detached and replaced with different models. The zone heating components 20 are heating devices based on heating wires, and each zone can be independently set to a heating temperature. The zone heating components 20 correspond to the feeding section, plasticizing section, homogenizing section, and outlet section of the extrusion cylinder 23, respectively, and the heating temperature of each zone is independently controllable. The outlet end of the extrusion shaping port 25 is equipped with an annular spray cooling component, which includes several spray heads evenly distributed along the circumference of the pipe. The spray angle of the spray heads is adjustable, and a temperature sensor is equipped to monitor the surface temperature of the pipe in real time to ensure cooling uniformity and reduce internal stress in the pipe.

[0018] The stirring device 10 includes a stirring shaft 101, on which several support plates 102 are fixedly connected. An inner spiral 103 is fixedly connected to each support plate 102, and an outer spiral 104 is fixedly connected to the outer end of each support plate 102. A separator 105 is provided between the outer spiral 104 and the inner spiral 103, and the separator 105 is fixedly connected to the support plate 102. The outer spiral 104 and the inner spiral 103 have opposite spiral directions. A scraper 106 is fixedly connected to the bottom of the stirring shaft 101 and the support plate 102. The scraper 106 is used to scrape the material at the bottom of the mixing tank 11.

[0019] The mixing tank 11 is provided with an external heat insulation layer 12, and a heating component 13 is provided inside the heat insulation layer 12. Several support columns 14 are provided at the bottom of the mixing tank 11. A material addition port 15, a vacuum tube interface 16, and a stirring drive device 17 are provided at the top of the mixing tank 11. The heating component 13 includes a heating spiral tube 131, and a heat-conducting medium addition pipe 132 and a heat-conducting medium discharge pipe 133 are provided at the end of the heating spiral tube 131. Several material addition ports 15 are provided, with different port diameters, for adding materials in different proportions.

[0020] The stirring drive device 17 includes a stirring drive motor 171 and a worm gear reducer 172. The worm gear reducer 172 is fixedly installed on the top of the mixing tank 11, and the output shaft of the worm gear reducer 172 is connected to the stirring device 10.

[0021] The extrusion drive device 22 includes an extrusion drive motor 221. The output shaft of the extrusion drive motor 221 is connected to a planetary gear reducer 222. A drive bevel gear 223 is mounted on the output shaft of the planetary gear reducer 222. The drive bevel gear 223 drives the twin screw 24 to rotate. The planetary gear reducer 222 has a two-stage planetary gear structure, including a motor output shaft 61. A first-stage input gear 62 is mounted on the motor output shaft 61. Three first-stage planetary gears 63 are externally meshed with the first-stage input gear 62. The three first-stage planetary gears 63 are rotatably mounted on the same bracket 64. An external gear ring 66 is simultaneously meshed with the three first-stage planetary gears 63. A transmission shaft 65 is fixedly connected to one side of the bracket 64. A second-stage input gear 67 is mounted on the end of the transmission shaft 65 away from the bracket 64. Three second-stage planetary gears 68 are externally meshed with the second-stage input gear 67. The three second-stage planetary gears 68 are rotatably mounted on the same bracket 69. An external gear ring 66 is simultaneously meshed with the three second-stage planetary gears 68. An output shaft is fixedly connected to one side of the bracket 69. A drive bevel gear 223 is mounted on the output shaft. The external gear ring 66 is also part of the housing of the planetary gear reducer 222; the three first-stage planetary gears 63 are symmetrically distributed about the first-stage input gear 62 at equal intervals; the three second-stage planetary gears 68 are symmetrically distributed about the second-stage input gear 67 at equal intervals.

[0022] The twin-screw 24 includes two screws with helical blades. One end of the twin-screw 24 is the driving end, and a driven bevel gear 241 is fixedly provided on the driving end screw. The driven bevel gears 241 of the two screws mesh together. A transmission bevel gear 242 is fixedly provided on the outer end of one of the driven bevel gears 241. The transmission bevel gear 242 meshes with the driving bevel gear 223. The end of the twin-screw 24 away from the driving end is the extrusion end. The distance between the axes of the two screws gradually decreases from the driving end to the extrusion end, and the pitch of the helical blades gradually increases. The cavity inside the extrusion cylinder 23 is adapted to the outer edge of the helical blades.

[0023] Example 1 In this embodiment, the AGR pipe extrusion production equipment includes a raw material mixing device 1 and an extrusion molding device 2. The raw material mixing device 1 is fixedly installed on the support platform 21 of the extrusion molding device 2 by a support column 14, forming an integrated structure.

[0024] The mixing tank 11 of the raw material mixing device 1 has a volume of 1000L. The external insulation layer 12 is made of rock wool with a thickness of 50mm. The heating spiral tube 131 of the internal heating component 13 is made of 304 stainless steel with a winding density of 5 turns / m. The heat transfer medium is high-temperature heat transfer oil (applicable temperature ≤200℃). The upper part of the mixing tank 11 is equipped with four material addition ports 15 with diameters of 20mm, 40mm, 60mm and 80mm, respectively, for adding AGR resin, antioxidant, ultraviolet absorber and filler; the vacuum tube interface 16 is connected to a 2X-70 type vacuum pump, and the vacuum degree can reach -0.09MPa.

[0025] The stirring device 10 has a stirring shaft 101 with a diameter of 50 mm, and four support plates 102 evenly distributed along the axial direction of the stirring shaft. The inner spiral 103 has a diameter of 400 mm, and the outer spiral 104 has a diameter of 850 mm, with opposite spiral directions (inner spiral clockwise, outer spiral counterclockwise). The separator cylinder 105 has a diameter of 600 mm and its height is the same as that of the support plate 102. The scraper 106 is made of polytetrafluoroethylene with a tungsten carbide wear-resistant coating on its surface, and has a 2 mm gap between it and the bottom inner wall of the mixing tank 11. The stirring drive device 17 has a stirring drive motor 171 with a power of 11 kW, a worm gear reducer 172 with a reduction ratio of 15, and the stirring speed can be adjusted within the range of 50-200 r / min.

[0026] The support platform 21 of the extrusion molding device 2 adopts an I-beam welded structure with a height of 1200mm; the extrusion cylinder 23 is 2500mm long and has an inner diameter of 120mm. It is externally equipped with four zone heating components 20, each with a power of 3kW and a temperature control range of 100-200℃, independently controlled by a PLC controller. The extrusion nozzle 25 is available in three sizes: DN50, DN110, and DN160, and is connected to the extrusion cylinder 23 via eight sets of M16 bolts. Replacement time is ≤15 minutes.

[0027] The extrusion drive motor 221 of the extrusion drive device 22 has a power of 37kW. The planetary gear reducer 222 is a two-stage planetary gear structure. The first-stage input gear 62 has 20 teeth, the first-stage planetary gear 63 has three teeth with 30 teeth, the second-stage input gear 67 has 25 teeth, the second-stage planetary gear 68 has three teeth with 35 teeth, the external gear ring 66 has 80 teeth, and the reduction ratio is 25. The driving bevel gear 223, the transmission bevel gear 242 and the driven bevel gear 241 are all bevel gears with a module of 4 and 25, 30 and 30 teeth respectively.

[0028] The twin-screw extruder has an aspect ratio of 25:1, which is designed to meet the plasticizing requirements of AGR resin, ensuring that the raw materials are fully melted and mixed during extrusion. The distance between the two screw axes at the drive end is 80mm, and the distance between the axes at the extrusion end is 75mm (1:0.9375 ratio). The pitch of the helical blades at the drive end is 60mm, and the pitch at the extrusion end is 90mm (1:1.5 ratio). The gap between the outer edge of the helical blades and the cavity of the extrusion barrel 23 is 0.3mm, and the blade surface is nitrided (hardness HV800).

[0029] The working process of this embodiment is as follows: 1. Raw material preparation and addition: According to the formula ratio (AGR resin 95.2%, antioxidant 1010 0.3%, ultraviolet absorber UV-531 0.5%, activated calcium carbonate 4%), add each component material into the mixing tank 11 through the material addition port 15 of the corresponding diameter, and close the sealing cover and discharge port valve.

[0030] 2. Mixing Process: Start the vacuum pump and evacuate the mixing tank 11 to -0.09 MPa through the vacuum pipe interface 16; start the stirring drive device 17, set the stirring speed to 120 r / min, and set the heating component 13 to 70℃ to begin mixing. The outer spiral 104 of the stirring device 10 pushes the material on the tank wall upwards, while the inner spiral 103 conveys the material in the center of the tank downwards, forming three-dimensional convection. The scraper 106 scrapes away the residual material at the bottom of the tank. After 8 minutes of mixing, a sample is taken to test the material uniformity deviation, which is 2.8%, meeting the production requirements.

[0031] 3. Extrusion Molding: Open the valve at the discharge port, and the mixed raw material enters the extrusion cylinder 23; set the temperature of the zone heating component 20 (feed section 155℃, plasticizing section 170℃, homogenizing section 172℃, outlet section 170℃), start the extrusion drive device 22, set the speed of the extrusion drive motor 221 to 50 r / min, and stabilize the output torque of the planetary gear reducer 222 at 1200 N. m, the driving bevel gear 223 drives the twin screw 24 to rotate synchronously in opposite directions (speed 20 r / min) through the transmission bevel gear 242 and the driven bevel gear 241. The raw material is gradually plasticized under the pushing and compression of the twin screw 24, and is extruded through the extrusion nozzle 25 (DN110 specification is selected in this embodiment) and the extrusion pressure is stabilized at 14±0.3MPa.

[0032] 4. Finished Product Inspection: After cooling and traction (using conventional cooling and traction equipment), the AGR pipes after molding are inspected as follows: wall thickness deviation ±0.12mm, impact strength 12.8kJ / m², elongation at break 175%, copolymer structure degradation rate 0.8%, and bubble defect rate 0.3%, all of which are better than the first-class standard for AGR pipes; 768 6m long pipes were produced in 24 hours of continuous operation, with only 3 defective pipes, resulting in a scrap rate of 0.39%.

[0033] This solution also includes a controller, the location of which is set by the operator according to the actual situation during operation. The controller is used to control the electrical components used in this solution, including but not limited to sensors, motors, telescopic rods, water pumps, solenoid valves, heating wires, heat pumps, displays, computer input devices, switches, communication devices, lights, speakers, and microphones. The controller is an Intel processor, AMD processor, PLC controller, ARM processor, or microcontroller. It is used in conjunction with a motherboard, memory modules, storage media, and power supply, which is AC power or a lithium battery. When a display screen is provided, a graphics card is also included. For the operating principle of the controller, please refer to "Principles of Automatic Control," "Microcontroller Principles and Application Simulation Cases," and "Sensor Principles and Applications" published by Tsinghua University Press. Other books in this field can also be consulted. Other automation control and electrical components not mentioned are knowledge well known to those skilled in the art and will not be described in detail here.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An AGR pipe extrusion production equipment, comprising a raw material mixing device (1) and an extrusion molding device (2), characterized in that: The raw material mixing device (1) is installed on the extrusion molding device (2). The raw material mixing device (1) includes a mixing tank (11), a stirring device (10) is provided in the mixing tank (11), and a discharge port is provided at the bottom of the mixing tank (11). The extrusion molding device (2) includes a support platform (21), an extrusion drive device (22) is fixedly installed on the support platform (21), an extrusion cylinder (23) is fixedly installed on the support platform (21), a twin screw (24) is rotatably installed in the extrusion cylinder (23), the extrusion drive device (22) drives the twin screw (24) to rotate, the discharge port is connected to the upper part of the extrusion cylinder (23), the end of the extrusion cylinder (23) is connected to the extrusion drive device (22), an extrusion shaping port (25) is fixedly installed at the end of the extrusion cylinder (23) away from the extrusion drive device (22), and several partitioned heating components (20) are provided on the outside of the extrusion cylinder (23).

2. The AGR pipe extrusion production equipment according to claim 1, characterized in that: The stirring device (10) includes a stirring shaft (101), a plurality of support plates (102) are fixedly connected to the stirring shaft (101), an inner spiral (103) is fixedly connected to the support plate (102), an outer spiral (104) is fixedly connected to the outer end of the support plate (102), a separator (105) is provided between the outer spiral (104) and the inner spiral (103), the separator (105) is fixedly connected to the support plate (102), the outer spiral (104) and the inner spiral (103) have opposite spiral directions, and a scraper (106) is fixedly connected to the bottom of the stirring shaft (101) and the support plate (102).

3. The AGR pipe extrusion production equipment according to claim 1, characterized in that: The mixing tank (11) is provided with an insulation layer (12) on the outside, and a heating component (13) is provided inside the insulation layer (12) of the mixing tank (11). Several support columns (14) are provided at the bottom of the mixing tank (11). A material addition port (15), a vacuum tube interface (16), and a stirring drive device (17) are provided at the top of the mixing tank (11). The heating component (13) includes a heating spiral tube (131). A heat transfer medium addition tube (132) and a heat transfer medium discharge tube (133) are provided at the end of the heating spiral tube (131).

4. The AGR pipe extrusion production equipment according to claim 1, characterized in that: The stirring drive device (17) includes a stirring drive motor (171) and a worm gear reducer (172). The worm gear reducer (172) is fixedly installed on the top of the mixing tank (11), and the output shaft of the worm gear reducer (172) is connected to the stirring device (10).

5. The AGR pipe extrusion production equipment according to claim 1, characterized in that: The extrusion drive device (22) includes an extrusion drive motor (221), the output shaft of which is connected to a planetary gear reducer (222), and a drive bevel gear (223) is mounted on the output shaft of the planetary gear reducer (222), which drives the twin screw (24) to rotate.

6. The AGR pipe extrusion production equipment according to claim 5, characterized in that: The twin screw (24) includes two screws with helical blades. One end of the twin screw (24) is the driving end. A driven bevel gear (241) is fixed on the driving end screw. The driven bevel gears (241) of the two screws mesh together. A transmission bevel gear (242) is fixed on the outer end of one of the driven bevel gears (241). The transmission bevel gear (242) meshes with the driving bevel gear (223). The end of the twin screw (24) away from the driving end is the extrusion end. The distance between the axes of the two screws gradually decreases from the driving end to the extrusion end of the twin screw (24), and the pitch of the helical blades gradually increases. The cavity inside the extrusion cylinder (23) is adapted to the outer edge of the helical blades.

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