Injection molding device for PVC pipe fitting production

Abstract

The application discloses a kind of injection molding devices for PVC pipe production, including workbench, workbench is fixedly provided with protective cover, conveying mechanism for conveying raw materials is provided on workbench, support column is rotatably arranged in protective cover, support column is sleeved with support frame, mounting disc is fixedly arranged on support column, lower mould is circumferentially arrayed on mounting disc, liquid injection head is provided on the side of lower mould, and one end of liquid injection head extends out of mounting disc, upper mould is provided on the side of lower mould, adjusting mechanism for adjusting the position of upper mould is provided on mounting disc, guiding mechanism is provided on mounting disc, and blanking groove is provided in workbench;The injection molding device for PVC pipe production is matched with mounting disc by supporting column, and the position of multiple sets of upper and lower moulds can be flexibly adjusted, the whole equipment is cyclically operated, the continuous and efficient processing of PVC pipe is realized, the injection molding equipment does not need to wait for a long time during product cooling stage, and the utilization rate of injection molding host is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, specifically to an injection molding device for the production of PVC pipe fittings. Background Technology

[0002] The injection molding equipment used in PVC pipe fitting production mainly heats and melts PVC plastic granules, then injects them into the mold cavity of the corresponding specification of pipe fittings under high pressure. After pressure holding, cooling and shaping, it is automatically demolded, and various special-shaped pipe fittings such as elbows, tees, straight pipes, and threaded joints are mass-produced. By changing the mold, standardized production of multiple specifications of pipe fittings can be achieved. At the same time, precise temperature control avoids high-temperature decomposition of PVC, ensuring the dimensional accuracy, pressure resistance and sealing performance of pipe fittings and the product qualification rate. It is the core production equipment for forming various special-shaped pipe fittings for PVC water supply and drainage and electrical wiring.

[0003] Chinese patent CN120096026A discloses an injection molding device for PVC pipe fitting production, including a base. A raw material processing device is fixedly installed at the front upper part of the base, and an injection molding structure is fixedly connected to the rear upper part of the base. A control terminal is fixedly connected to the right end of the injection molding structure. The base's inner cavity has a discharge structure communicating with its upper and front ends. This injection molding device for PVC pipe fitting production utilizes a telescopic rod to drive a molding and feeding assembly towards an injection assembly under the guidance of a guide plate, where it closes tightly against the injection assembly. Molten PVC raw material is fed into the injection assembly through the raw material processing device, and the injection assembly solidifies the material to form a pipe. Automatic demolding is achieved through the cooperation of the molding and feeding assembly and the guide plate, improving the molding quality and production efficiency of the pipe, providing more precise control, reducing manual intervention, and ensuring product consistency and stability.

[0004] In traditional single-mold injection molding production, after the injection molding process is completed, it is necessary to wait for the plastic part inside the mold to cool and solidify fully before completing a series of operations such as mold opening, product demolding and material removal, and mold cavity cleaning. Only then can the mold be closed again for the next round of injection molding. During this process, the injection molding equipment is idle for a long time during the plastic part cooling stage, resulting in low utilization of core equipment, long production cycle for single products, and low overall production efficiency for batch processing. Operators can only operate intermittently according to the equipment's operating cycle, resulting in low utilization of manual labor hours. They can only complete auxiliary tasks within the limited time of a single mold opening, which can easily restrict the overall production rhythm. At the same time, the single-mold structure cannot carry out multiple processes such as injection molding, finished product unloading, and mold pretreatment simultaneously, resulting in weak production adaptability and difficulty in meeting the needs of continuous, high-efficiency, large-scale batch production.

[0005] Therefore, the present invention provides an injection molding device for the production of PVC pipe fittings. Summary of the Invention

[0006] The purpose of this invention is to provide an injection molding apparatus for the production of PVC pipe fittings, so as to solve the problems mentioned in the background art.

[0007] An injection molding device for producing PVC pipe fittings includes a worktable with a protective cover fixedly mounted on it. A conveying mechanism for transporting raw materials is also provided on the worktable. A support column is rotatably mounted inside the protective cover, and a support frame is fitted onto the support column and fixedly connected to the worktable. An mounting plate is fixedly mounted on the support column, and lower molds are arranged in a circular array on the mounting plate. An injection head is located on the side of each lower mold, with one end extending out of the mounting plate. An upper mold is located on the side of the lower mold, and a mounting plate is provided with a mechanism for mounting the upper mold. The adjustment mechanism for position adjustment includes a guide mechanism on the mounting plate, a material discharge chute inside the workbench located on one side of the mounting plate, a drive mechanism for rotating the support column on the side of the protective cover, the drive mechanism including a second reducer and a power motor, the second reducer being fixed to the side of the protective cover and its output end being fixedly connected to one end of the support column, the power motor being fixed to the side of the second reducer and its output end being fixedly connected to the input end of the second reducer, and a purification mechanism on the top of the protective cover.

[0008] By adopting the above scheme, the material is melted and conveyed through the movement of the conveying mechanism. After being connected to the corresponding injection head on one side, the molten material medium can flow into the lower mold. Through the cavity formed by the upper mold, the PVC pipe fitting can be formed. Then, it is no longer connected to the injection head. The control motor drives the second reducer to move, which in turn drives the support column to rotate. When the support column rotates, it drives the mounting plate to rotate. The guide mechanism can guide the mounting plate to move smoothly. When the mounting plate rotates, it drives multiple sets of lower and upper molds to move synchronously. After rotating 90 degrees, the next set of un-injected lower and upper molds will move to the injection point, while the already-injected molds will move to the next station for cooling. After rotating 90 degrees again, the injection mold will move to the top of the material discharge trough. The position of the upper mold can then be adjusted by the adjustment mechanism. This allows for the separation of the upper and lower molds, enabling the demolding and unloading of the molded PVC pipe fittings. This facilitates rapid production of PVC pipe fittings, unlike the traditional single-mold injection molding method that requires waiting for the product to cool and be removed before the next injection. It eliminates the need for long waiting times for cooling, significantly improving the utilization rate of injection molding equipment and shortening the production cycle per piece. While ensuring stable molding quality, it effectively improves batch production efficiency. It also allows operators to continuously perform auxiliary tasks such as part removal and insert embedding, resulting in higher labor utilization, stronger production compatibility and automation scalability. Multiple upper and lower molds can be fitted with cavities of different specifications, facilitating the production of pipe fittings of different sizes and adapting to the rotation of multiple product specifications. The purification mechanism effectively filters the generated gases.

[0009] Preferably, the conveying mechanism includes a support frame, a screw extruder, a conveying shaft, a first reducer, and a drive motor. The support frame is fixed on the worktable, the screw extruder is fixed inside the support frame, the conveying shaft is rotatably disposed inside the screw extruder, the first reducer is fixed on the worktable and located on one side of the screw extruder, one end of the conveying shaft is fixedly connected to the output end of the first reducer, the drive motor is fixed to one side of the first reducer, and the output end of the drive motor is fixedly connected to the input end of the first reducer. A hopper is installed on the top of the screw extruder, and a controller is fixedly installed on the side of the protective cover.

[0010] By adopting the above scheme, after the raw material is placed inside the hopper, it can enter the screw extruder. The drive motor can drive the No. 1 reducer to move, which in turn can drive the conveyor shaft to rotate. The raw material can be conveyed through the conveyor shaft. The screw extruder is equipped with a heating component, which can perform fusion processing on the raw material.

[0011] Preferably, the conveying mechanism further includes a conveying pump, a conveying pipe, a connecting plate, a connector, and an electric push rod. The conveying pump is fixed to the side of the protective cover, and the output end of the screw extruder is connected to the input end of the conveying pump. One end of the conveying pipe is connected to the output end of the conveying pump. The connector is fixedly connected to the end of the conveying pipe. The connecting plate is fixed to the connector. The electric push rod is fixed inside the protective cover, and the telescopic end of the electric push rod is fixedly connected to the connecting plate. The connector is located on the side of the injection head.

[0012] By adopting the above scheme, after the molten raw material flows into the delivery pump, the connector is aligned with the injection head. The electric push rod is controlled to work, and the position of the connector can be adjusted through the connecting plate. After the connector is connected to the injection head, the delivery pump works to extract and deliver the raw material. The delivered raw material can flow into the mold cavity through the injection head, thus facilitating the production of PVC pipe fittings.

[0013] Preferably, the guiding mechanism includes an annular groove and a guide ring. The annular groove is disposed on the mounting plate, the guide ring engages with the annular groove, and the guide ring is fixedly connected to the inner wall of the protective cover.

[0014] By adopting the above scheme, when the support column rotates and drives the mounting plate to move, the mounting plate can be guided and limited by the cooperation of the annular groove and the guide ring, so that the mounting plate can rotate smoothly.

[0015] Preferably, the adjustment mechanism includes a connecting block, a guide groove, a limiting plate, a threaded rod, and a servo motor. The connecting block is fixed to the side of the upper mold, the guide groove corresponding to the upper mold is fixed on the mounting plate, the limiting plate passes through the guide groove, and the other end of the limiting plate is fixedly connected to the connecting block. The threaded rod is threadedly connected to the limiting plate, and the servo motor is fixed in the guide groove, with the output end of the servo motor fixedly connected to one end of the threaded rod.

[0016] By adopting the above scheme, after the upper and lower molds are moved to the top of the material unloading groove, when demolding and unloading are required, the servo motor will drive the threaded rod to rotate. When the threaded rod rotates, it will adjust the position of the limit plate. The guide groove will guide the limit plate, which will then cause the connecting block to move smoothly. When the connecting block moves, it will drive the upper mold to move. After the upper and lower molds are separated, the formed PVC pipe fittings can be unloaded.

[0017] Preferably, a guide cylinder is fixedly provided on the upper mold, a guide shaft is inserted inside the guide cylinder, a support plate is fixedly provided on the support column, and the other end of the guide shaft is fixedly connected to the side of the support plate.

[0018] By adopting the above scheme, the upper mold will move, which will drive the guide cylinder to move. Through the cooperation of the guide shaft, the upper mold will be guided, so that the upper mold can move smoothly.

[0019] Preferably, an air ring is fixedly provided on the side of the support plate, and nozzles are arranged in a circumferential array on the air ring. A large gear is fixedly provided on the support column, a rotary joint is provided at one end of the support column, and a connecting pipe is provided inside the support column. One end of the connecting pipe is connected to the rotary joint, and the other end of the connecting pipe is connected to the air ring.

[0020] By adopting the above scheme, the support plate provides installation space for the air ring. After the air enters the air ring through the connecting pipe, it will flow to one side through the nozzle. When the air flows, the generated gas will flow towards the air hood, which facilitates the collection and treatment of harmful gases and effectively prevents the spread of harmful gases.

[0021] Preferably, a bellows is fixedly mounted on the support frame, a filter screen is fixedly mounted on the side of the bellows, a fan is fixedly mounted inside the bellows, a drive shaft is fixedly connected to the impeller inside the fan, a small gear is fixedly connected to the end of the drive shaft, and the small gear meshes with a large gear, an air inlet pipe is connected to the input end of the fan, an air delivery pipe is connected to the output end of the fan, and the other end of the air delivery pipe is connected to a rotary joint.

[0022] By adopting the above scheme, when the support column rotates, it drives the large gear to rotate, which in turn drives the drive shaft to move through the small gear. When the drive shaft moves, it drives the fan to move and generate airflow. The airflow can be delivered through the air supply pipe. After the airflow enters the rotary joint, it flows into the connecting pipe and is then delivered through the connecting pipe. Air can be extracted through the air intake pipe.

[0023] Preferably, the purification mechanism includes a purification box, a ventilation pipe, a filter plate, an air duct, and an air hood. The purification box is fixed to the top of the protective cover, the ventilation pipe is fixed to one side of the purification box, and the other end of the ventilation pipe is connected to the air inlet pipe. The filter plate is fixed inside the purification box, the air duct is fixed to the bottom of the purification box, and one end of the purification box extends into the protective cover. The air hood is connected to the air duct, and the air hood is inclined inside.

[0024] By adopting the above scheme, when the air intake pipe draws air, the ventilation pipe draws air from inside the purification chamber, causing airflow. This airflow creates suction in the air duct and hood, which in turn draws gas from inside the protective cover. After the gas flows into the purification chamber, it passes through the filter plate. The filter material inside the filter plate effectively filters and intercepts particulate matter carried by the gas, thus effectively purifying the gas and preventing the spread of harmful gases from affecting the surrounding environment.

[0025] Preferably, the mounting plate has a circumferential array of grooves connected to an annular groove. The guide ring has a movable groove, with symmetrically fixed limit shafts within each groove. A sliding plate is located within the movable groove, with the limit shafts penetrating the sliding plate. A first spring is wound around the limit shaft, with its ends fixedly connected to both the movable groove and the sliding plate. A magnetic block is fixedly located within the movable groove, and an electromagnet corresponding to the magnetic block is fixedly located within the sliding plate. A through groove is provided on the movable groove, with a striking block passing through it. One end of the striking block is arc-shaped. A frame is fixedly located on the sliding plate, with one end of the striking block extending into the frame. The striking block has a convex shape. A shaft is fixedly located within the frame, penetrating the striking block. A second spring is wound around the shaft, with its ends fixedly connected to both the striking block and the sliding plate.

[0026] By adopting the above scheme, the repeated movement of the driving striking block causes one end of the striking block to collide with the annular groove, causing the mounting plate to vibrate. This vibration is then transmitted to the mold, using low-frequency vibration to assist in the injection molding of pipe fittings. This effectively reduces the viscosity of PVC melt, improves the cavity filling effect, quickly removes trapped gas from the melt, and reduces quality problems such as shrinkage cavities, weld lines, and internal stress deformation. It also improves the density of pipe fittings and the yield of finished products. Furthermore, it can appropriately reduce the injection pressure to avoid overheating and degradation of materials. Combined with a multi-station rotating mold, it can stably achieve continuous and efficient production. While optimizing the product molding quality, it can also reduce the generation of waste gas, reduce the treatment load of the workshop's waste gas purification device, and ensure uninterrupted continuous production with multi-station rotation. This effectively achieves high-quality, uninterrupted, large-scale continuous production of pipe fittings.

[0027] Compared with the prior art, the beneficial effects of the present invention are: 1. The injection molding device for PVC pipe fitting production described in this invention, through the matching arrangement of support columns and mounting plates, can flexibly complete the position adjustment of multiple sets of upper and lower molds, meeting the operational requirements of continuous production of PVC pipe fittings. The support columns are driven to rotate by a power motor via a second reducer, which in turn drives the mounting plate to rotate synchronously. A guiding mechanism limits and guides the running trajectory of the mounting plate, ensuring smooth and reliable rotation. When the mounting plate rotates, it can drive multiple sets of upper and lower molds to move synchronously. Every 90-degree rotation of the molds, the set of molds to be injected can be precisely switched to the injection station to complete the molding operation. The molds that have completed injection are then transferred to the cooling station for pressure holding and shaping. The molds rotate again, causing the forming mold to move directly above the unloading chute. At this time, the servo motor drives the threaded rod to rotate, cooperating with the guide groove to guide and limit the positioning plate, driving the connection... The block moves smoothly, causing the upper and lower molds to open and separate. The molded PVC pipe fittings can then be automatically unmolded. The entire set of equipment operates in a cycle, achieving continuous and efficient processing of PVC pipe fittings. Compared with the traditional single-mold serial injection molding process, there is no need for the injection molding equipment to wait for a long time during the product cooling stage, effectively improving the utilization rate of the injection molding machine and reducing the production cycle of a single product. While ensuring the stable quality of the pipe fittings, it significantly improves the efficiency of batch production. Operators can continuously complete auxiliary processes such as picking up parts and pre-installing inserts at the corresponding workstations, resulting in higher labor utilization efficiency. The equipment has excellent production adaptability and automation upgrade and expansion space. In addition, multiple sets of upper and lower molds can be configured with different specifications of molding cavities, which can not only produce the same type of PVC pipe fittings in batches, but also flexibly process products of various specifications, making it more applicable.

[0028] 2. The injection molding device for PVC pipe fitting production described in this invention uses air ducts and filter plates to treat harmful waste gases generated during the production process. Air is drawn in through the air inlet pipe, and the gas inside the purification chamber is continuously drawn in through the ventilation pipe to form a directional airflow. This creates negative pressure suction between the air ducts and the air hood, which collects the waste gas generated inside the protective cover and guides it into the purification chamber. When the waste gas flows through the filter plate, the filter material inside the filter plate intercepts and filters the dust, particulate matter and other pollutants carried in the gas, completing the waste gas purification operation. This effectively prevents harmful gases from spreading outward, improves the workshop working environment, and avoids the waste gas from causing harm to the surrounding environment and the health of the operators.

[0029] 3. The injection molding device for PVC pipe fitting production described in this invention, equipped with an air ring and a nozzle, can assist in collecting harmful waste gases generated during the processing of PVC pipe fittings. When the support column rotates and drives the large gear to mesh with the small gear to drive the drive shaft, the fan can be driven to work simultaneously to form a directional airflow. The airflow is transported to the rotary joint through the air supply pipe, then introduced into the air ring through the connecting pipe, and finally blown out directionally by the nozzle. With the guiding effect of this lateral airflow, the harmful gases volatilized during the production process can be accurately blown to the air collection area of ​​the air hood, and collected and treated centrally in conjunction with the waste gas purification structure, effectively improving the waste gas collection efficiency and reducing the unorganized diffusion of harmful gases.

[0030] 4. The injection molding device for PVC pipe fitting production described in this invention drives a striking block to reciprocate, with the end of the striking block periodically colliding with the annular groove. This causes the mounting plate to vibrate at a low frequency, which is then transmitted to the injection mold. This low-frequency vibration method assists in the injection molding of PVC pipe fittings, effectively reducing the viscosity of the PVC melt, improving the filling effect of the melt in the mold cavity, quickly expelling the gas entrained in the melt, reducing molding defects such as shrinkage cavities, weld lines, and internal stress deformation in the pipe fittings, and improving the density and finished product qualification rate of the pipe fittings. At the same time, it can appropriately reduce the injection pressure to avoid overheating and degradation of the material due to strong shear friction. This reduces the generation of harmful waste gas during the production process, lightens the treatment load of the waste gas purification device, and is adaptable to the operating conditions of multi-station rotary molds, ensuring stable rotation and uninterrupted continuous operation of each station, ultimately achieving high-quality, large-scale continuous production of PVC pipe fittings. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the injection molding device for producing PVC pipe fittings according to the present invention; Figure 2 This is a schematic diagram of the support column and support disk structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the mounting plate and guide ring of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the mounting plate and annular groove of the present invention; Figure 5 This is a three-dimensional structural diagram of the guide groove and connecting block of the present invention; Figure 6 This is a three-dimensional structural diagram of the support column and large gear of the present invention; Figure 7 This is a three-dimensional structural diagram of the connector and electric push rod of the present invention; Figure 8 This is a schematic diagram of the bellows structure of the present invention; Figure 9 This is a three-dimensional structural diagram of the purification box of the present invention; Figure 10This is a schematic diagram of the structure of the annular groove and the recess in this invention; Figure 11 This is a schematic diagram of the structure of the movable groove of the present invention.

[0032] In the diagram: 1. Workbench; 2. Support frame; 3. Screw extruder; 4. Conveyor shaft; 5. No. 1 reducer; 6. Drive motor; 7. Hopper; 8. Conveying pump; 9. Conveying pipe; 10. Connecting plate; 11. Connector; 12. Electric push rod; 13. Protective cover; 14. Support frame; 15. Support column; 16. Mounting plate; 17. Annular groove; 18. Guide ring; 19. Lower die; 20. Injection head; 21. Upper die; 22. Connecting block; 23. Guide groove; 24. Limiting plate; 25. Threaded rod; 26. Servo motor; 27. Guide cylinder; 28. Guide shaft; 29. ​​Support plate; 30. Air ring; 31. Nozzle; 32. Large gear; 33. Rotary joint; 34. Connecting pipe; 35. Air box; 36. Filter screen; 37. Fan; 38. Drive shaft; 39. Small gear; 40. Air supply pipe; 41. Air inlet pipe; 42. Purification box; 43. Ventilation pipe; 44. Filter plate; 45. Air duct; 46. Air cover; 47. Controller; 48. Second reducer; 49. Power motor; 50. Feed chute; 51. Groove; 52. Movable groove; 53. Limiting shaft; 54. Sliding plate; 55. Magnetic block; 56. First spring; 57. Electromagnet; 58. Frame; 59. Shaft; 60. Second spring; 61. Striking block; 62. Through groove. Detailed Implementation

[0033] 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 scope of protection of the present invention.

[0034] Please see Figure 1-11This invention provides a technical solution: an injection molding device for producing PVC pipe fittings, including a workbench 1, a protective cover 13 fixedly mounted on the workbench 1, a conveying mechanism for conveying raw materials mounted on the workbench 1, a support column 15 rotatably mounted inside the protective cover 13, a support frame 14 sleeved on the support column 15 and fixedly connected to the workbench 1, an installation plate 16 fixedly mounted on the support column 15, lower molds 19 arranged circumferentially on the installation plate 16, an injection head 20 mounted on the side of the lower mold 19, one end of the injection head 20 extending out of the installation plate 16, an upper mold 21 mounted on the side of the lower mold 19, and a useful... The adjustment mechanism for adjusting the position of the upper mold 21 includes a guide mechanism on the mounting plate 16, a material discharge groove 50 inside the worktable 1, and the material discharge groove 50 is located on one side of the mounting plate 16. The protective cover 13 has a drive mechanism on its side for driving the support column 15 to rotate. The drive mechanism includes a second reducer 48 and a power motor 49. The second reducer 48 is fixed to the side of the protective cover 13, and the output end of the second reducer 48 is fixedly connected to one end of the support column 15. The power motor 49 is fixed to the side of the second reducer 48, and the output end of the power motor 49 is fixedly connected to the input end of the second reducer 48. The top of the protective cover 13 has a purification mechanism.

[0035] When using an injection molding device for PVC pipe fitting production, the material is melted and conveyed through the movement of the conveying mechanism. After being connected to the corresponding injection head 20 on one side, the molten material medium flows into the lower mold 19. Through the cavity formed by the upper mold 21, the PVC pipe fitting is formed. Then, it is no longer connected to the injection head 20. The control motor 49 drives the second reducer 48 to move, which in turn drives the support column 15 to rotate. When the support column 15 rotates, it drives the mounting plate 16 to rotate. The guide mechanism guides the mounting plate 16 to move smoothly. When the mounting plate 16 rotates, it drives multiple sets of lower molds 19 and upper molds 21 to move synchronously. After rotating 90 degrees, the next set of un-injected lower molds 19 and upper molds 21 moves to the injection point, while the already-injected molds move to the next station for cooling. After rotating 90 degrees again, the injection mold moves to the material discharge trough. After reaching 50, the position of the upper mold 21 is adjusted by the adjustment mechanism, which allows the lower mold 19 and the upper mold 21 to separate, enabling the demolding and unloading of the formed PVC pipe fitting. This allows for the rapid production of PVC pipe fittings. Compared to the traditional single-mold injection molding method, which requires waiting for the product to cool and be removed before the next injection, this method eliminates the need for long standby cooling processes, significantly improving the utilization rate of injection molding equipment and shortening the production cycle of a single piece. While ensuring stable molding quality of plastic parts, it effectively improves the efficiency of batch production. At the same time, it facilitates operators to continuously complete auxiliary operations such as part removal and pre-embedding, resulting in higher labor utilization and stronger production compatibility and automation scalability. Different cavities of different specifications can also be set in multiple sets of upper molds 19 and lower molds 21, making it convenient to produce pipe fittings of different specifications. It can also adapt to the rotation production of multiple specifications of products. The purification mechanism can effectively filter the generated gas.

[0036] Furthermore, the conveying mechanism includes a support 2, a screw extruder 3, a conveying shaft 4, a first reducer 5, and a drive motor 6. The support 2 is fixed on the worktable 1, the screw extruder 3 is fixed inside the support 2, the conveying shaft 4 is rotatably installed inside the screw extruder 3, the first reducer 5 is fixed on the worktable 1 and is located on one side of the screw extruder 3, one end of the conveying shaft 4 is fixedly connected to the output end of the first reducer 5, the drive motor 6 is fixed on one side of the first reducer 5, and the output end of the drive motor 6 is fixedly connected to the input end of the first reducer 5. A hopper 7 is installed on the top of the screw extruder 3, and a controller 47 is fixedly installed on the side of the protective cover 13. The controller 47 is electrically connected to the electronic equipment on the injection molding device for PVC pipe fitting production, and can control the operation of the electronic equipment. After the raw material is placed inside the hopper 7, it can enter the screw extruder 3. The drive motor 6 can drive the first reducer 5 to move, which in turn can drive the conveyor shaft 4 to rotate. The raw material can be conveyed through the conveyor shaft 4. A heating component is provided on the screw extruder 3 to perform fusion processing on the raw material (existing technology).

[0037] Furthermore, the conveying mechanism also includes a conveying pump 8, a conveying pipe 9, a connecting plate 10, a connector 11, and an electric push rod 12. The conveying pump 8 is fixed to the side of the protective cover 13, and the output end of the screw extruder 3 is connected to the input end of the conveying pump 8. One end of the conveying pipe 9 is connected to the output end of the conveying pump 8. The connector 11 is fixedly connected to the end of the conveying pipe 9. The connecting plate 10 is fixed on the connector 11. The electric push rod 12 is fixed inside the protective cover 13, and the telescopic end of the electric push rod 12 is fixedly connected to the connecting plate 10. The connector 11 is located on one side of the injection head 20. After the melted raw material flows into the delivery pump 8, the connector 11 is aligned with the injection head 20. The electric push rod 12 is controlled to work. The position of the connector 11 can be adjusted through the connecting plate 10. After the connector 11 is connected to the injection head 20, the delivery pump 8 works to extract and deliver the raw material. The delivered raw material can flow into the mold cavity through the injection head 20, which facilitates the production of PVC pipe fittings. The position of the connector 11 can be adjusted by the electric push rod 12. (The upper mold 19 and the lower mold 21 are existing technologies.)

[0038] Furthermore, the guiding mechanism includes an annular groove 17 and a guide ring 18. The annular groove 17 is disposed on the mounting plate 16, the guide ring 18 engages with the annular groove 17, and the guide ring 18 is fixedly connected to the inner wall of the protective cover 13. When the support column 15 rotates and drives the mounting plate 16 to move, the mounting plate 16 can be guided and limited by the cooperation of the annular groove 17 and the guide ring 18, so that the mounting plate 16 can rotate smoothly.

[0039] Furthermore, the adjustment mechanism includes a connecting block 22, a guide groove 23, a limiting plate 24, a threaded rod 25, and a servo motor 26. The connecting block 22 is fixed to the side of the upper mold 21, the guide groove 23 corresponding to the upper mold 21 is fixed on the mounting plate 16, the limiting plate 24 passes through the guide groove 23, and the other end of the limiting plate 24 is fixedly connected to the connecting block 22. The threaded rod 25 is threadedly connected to the limiting plate 24, and the servo motor 26 is fixed in the guide groove 23, and the output end of the servo motor 26 is fixedly connected to one end of the threaded rod 25. After the PVC pipe fitting is formed, the upper mold 19 and the lower mold 21 are moved to the top of the unloading groove 50. When demolding and unloading are required, the servo motor 26 is controlled to drive the threaded rod 25 to rotate. When the threaded rod 25 rotates, it will adjust the position of the limiting plate 24. The limiting plate 24 will be guided by the guide groove 23, which will cause the connecting block 22 to move smoothly. When the connecting block 22 moves, it will drive the upper mold 21 to move. After the upper mold 21 and the lower mold 19 are separated, the formed PVC pipe fitting can be unloaded.

[0040] Furthermore, a guide cylinder 27 is fixedly installed on the upper mold 21, a guide shaft 28 is inserted inside the guide cylinder 27, a support plate 29 is fixedly installed on the support column 15, and the other end of the guide shaft 28 is fixedly connected to the side of the support plate 29. When the upper mold 21 moves, it will drive the guide cylinder 27 to move. Through the cooperation of the guide shaft 28, the upper mold 21 will be guided, so that the upper mold 21 moves smoothly.

[0041] Furthermore, a wind ring 30 is fixedly installed on the side of the support plate 29, and nozzles 31 are arranged in a circular array on the wind ring 30. A large gear 32 is fixedly installed on the support column 15. A rotary joint 33 is installed at one end of the support column 15. A connecting pipe 34 is installed inside the support column 15, and one end of the connecting pipe 34 is connected to the rotary joint 33, and the other end of the connecting pipe 34 is connected to the wind ring 30. The support plate 29 provides installation space for the air ring 30. After the air enters the air ring 30 through the connecting pipe 34, it will flow to one side through the nozzle 31. When the air flows, the generated gas will flow towards the air cover 46, which facilitates the collection and treatment of harmful gases and effectively prevents the diffusion of harmful gases.

[0042] Furthermore, a bellows 35 is fixedly installed on the support frame 14, a filter screen 36 is fixedly installed on the side of the bellows 35, a fan 37 is fixedly installed inside the bellows 35, a drive shaft 38 is fixedly connected to the impeller inside the fan 37, a small gear 39 is fixedly connected to the end of the drive shaft 38, and the small gear 39 meshes with the large gear 32. An air inlet pipe 41 is connected to the input end of the fan 37, and an air delivery pipe 40 is connected to the output end of the fan 37, and the other end of the air delivery pipe 40 is connected to the rotary joint 33. When the support column 15 rotates, it drives the large gear 32 to rotate, which in turn drives the drive shaft 38 to move through the small gear 39. When the drive shaft 38 moves, it drives the fan 37 to move and generate airflow. The airflow can be delivered through the air pipe 40. After the airflow enters the rotary joint 33, it will flow into the connecting pipe 34 and then be delivered through the connecting pipe 34. Air can be extracted through the air inlet pipe 41.

[0043] Furthermore, the purification mechanism includes a purification box 42, a ventilation pipe 43, a filter plate 44, an air duct 45, and an air hood 46. The purification box 42 is fixed to the top of the protective cover 13, the ventilation pipe 43 is fixed to one side of the purification box 42, and the other end of the ventilation pipe 43 is connected to the air inlet pipe 41. The filter plate 44 is fixed inside the purification box 42, the air duct 45 is fixed to the bottom of the purification box 42, and one end of the purification box 42 extends into the protective cover 13. The air hood 46 is connected to the air duct 45, and the air hood 46 is inclined inside. When air is drawn in through the intake pipe 41, the air inside the purification chamber 42 is also drawn in through the ventilation pipe 43. This airflow causes the air duct 45 and the air hood 46 to generate suction, which in turn draws in the gas inside the protective cover 13. After the gas flows into the purification chamber 42, it flows through the filter plate 44. The filter material inside the filter plate 44 can effectively filter and intercept the particulate matter carried by the gas, thereby effectively purifying the gas and effectively preventing the spread of harmful gases from affecting the surrounding environment.

[0044] Furthermore, the mounting plate 16 has grooves 51 arranged in a circumferential array, and the grooves 51 are connected to the annular groove 17. The guide ring 18 has a movable groove 52, and a limiting shaft 53 is symmetrically fixed in the movable groove 52. A sliding plate 54 is arranged in the movable groove 52, and the limiting shaft 53 passes through the sliding plate 54. A first spring 56 is arranged around the limiting shaft 53, and the ends of the first spring 56 are fixedly connected to the movable groove 52 and the sliding plate 54 respectively. A magnetic block 55 is fixedly arranged in the movable groove 52, and a magnetic block 55 is fixedly arranged in the sliding plate 54. The electromagnet 57 corresponding to the suction block 55 has a through groove 62 on the movable groove 52, and a striking block 61 is inserted through the through groove 62. One end of the striking block 61 is arc-shaped. A frame 58 is fixedly installed on the sliding plate 54, and one end of the striking block 61 extends into the frame 58. The striking block 61 is convex in shape. A shaft 59 is fixedly installed inside the frame 58, and the shaft 59 passes through the striking block 61. A second spring 60 is arranged around the shaft 59, and the ends of the second spring 60 are fixedly connected to the striking block 61 and the sliding plate 54 respectively. When the mounting plate 16 rotates to adjust the mold position, under normal conditions, the striking block 61 is completely inside the movable groove 52 and will not be driven to move. When it is necessary to fill the complex cavity of the pipe more fully, the electromagnet 57 is controlled to work to generate a strong magnet, which, in conjunction with the magnetic block 55, will drive the sliding plate 54 to move. The limiting shaft 53 will guide the sliding plate 54. When the sliding plate 54 moves, it will drive the frame 58 and the striking block 61 to move. Through the through groove 62, one end of the striking block 61 will enter the annular groove 17. The striking block 61 will contact the inner wall of the annular groove 17. Then, when the mounting plate 16 rotates, the groove 51 and the striking block 61 will cooperate to push the striking block 61 to move. Through the second spring 60, the striking block 61 can be driven to move repeatedly. The striking block 61 collidees with the annular groove 17, causing the mounting plate 16 to vibrate. This vibration is then transmitted to the mold. Using low-frequency vibration to assist in the injection molding of pipe fittings can effectively reduce the viscosity of PVC melt, improve the cavity filling effect, quickly expel trapped gas in the melt, reduce quality problems such as shrinkage cavities, weld lines, and internal stress deformation, improve the density of pipe fittings and the yield of finished products, and can also appropriately reduce the injection pressure to avoid material overheating and degradation. Combined with multi-station rotating molds, it can stably achieve continuous and efficient production. While optimizing the product molding quality, it can also reduce the generation of waste gas, reduce the treatment load of the workshop's waste gas purification device, and ensure uninterrupted continuous production with multi-station rotation. This effectively achieves high-quality, uninterrupted, large-scale continuous production of pipe fittings.

[0045] Working Principle: First, when using the injection molding device for PVC pipe fitting production to produce PVC pipe fittings, the raw material is placed inside the hopper 7 and then enters the screw extruder 3. The drive motor 6 drives the first reducer 5, which in turn drives the conveyor shaft 4 to rotate. The conveyor shaft 4 conveys the raw material. The screw extruder 3 is equipped with a heating component to melt and process the raw material. After the melted raw material flows into the conveying pump 8, the connector 11 is aligned with the injection head 20. The electric push rod 12 is controlled to adjust the position of the connector 11 through the connecting plate 10. After the connector 11 is connected to the injection head 20, the conveying pump 8 operates to extract and convey the raw material, allowing the molten material to flow into the lower mold 19. Through the cavity formed with the upper mold 21, the PVC pipe fitting is formed. Then, it is no longer connected to the injection head 20. The power motor 49 drives the second reducer 48, which in turn drives the support column 15 to rotate. When the support column 15 rotates, it drives the mounting plate 16 to rotate. The mounting plate 16 is guided by a guiding mechanism to ensure smooth movement. The rotation of the mounting plate 16 drives multiple sets of lower molds 19 and upper molds 21 to move synchronously. After rotating 90 degrees, the next set of un-injected lower molds 19 and upper molds 21 moves to the injection point, while the already-injected molds move to the next station for cooling. After rotating 90 degrees again, the injection mold moves directly above the material discharge groove 50. The servo motor 26 then drives the threaded rod 25 to rotate. The rotation of the threaded rod 25 adjusts the position of the limit plate 24, which is guided by the guide groove 23. This causes the connecting block 22 to move smoothly. The movement of the connecting block 22 drives the upper mold 21 to move, separating the upper mold 21 from the lower mold 19. This allows for the unmolding of the formed PVC pipe fittings, enabling rapid production of PVC pipe fittings. Compared to the traditional single-mold injection molding process that requires waiting for the product to cool and be removed before the next injection, this method eliminates the need for long standby cooling periods, significantly improving the utilization rate of injection molding equipment, shortening the production cycle time per piece, and effectively increasing batch production efficiency while ensuring stable molded part quality. It also allows operators to continuously perform auxiliary tasks such as part removal and insert embedding, resulting in higher labor utilization and stronger production compatibility and automation scalability. Multiple upper molds 19 and lower molds 21 can be fitted with cavities of different specifications, facilitating the production of different sizes of pipe fittings and adapting to the rotational production of multiple product specifications. When the support column 15 rotates, it drives the large gear 32, which in turn drives the drive shaft 38 via the small gear 39. The drive shaft 38 then drives the fan 37, generating airflow. This airflow is then distributed through the air pipe 40. The airflow enters the rotary joint 33 and flows into the connecting pipe 34, where it is then transported. After entering the air ring 30, the airflow passes through the nozzle 31 and flows to one side. This airflow causes the generated gas to flow towards the air hood 46. Air is drawn in through the air inlet pipe 41, and simultaneously, the ventilation pipe 43 draws air from inside the purification chamber 42. This airflow creates suction in the air duct 45 and the air hood 46, further drawing in gas from inside the protective cover 13. Once inside the purification chamber 42, the gas flows through the filter plate 44. The filter material inside the filter plate 44 effectively filters and intercepts particulate matter carried by the gas, thus effectively purifying the gas and preventing the spread of harmful gases that could impact the surrounding environment.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding device for producing PVC pipe fittings, characterized in that: Includes a workbench (1), on which a protective cover (13) is fixedly installed, and on which a conveying mechanism for conveying raw materials is installed; A support column (15) is rotatably arranged inside the protective cover (13). A support frame (14) is sleeved on the support column (15) and the support frame (14) is fixedly connected to the workbench (1). An installation plate (16) is fixedly arranged on the support column (15). A lower mold (19) is arranged in a circular array on the installation plate (16). An injection head (20) is arranged on the side of the lower mold (19) and one end of the injection head (20) extends out of the installation plate (16). An upper mold (21) is arranged on the side of the lower mold (19). An adjustment mechanism for adjusting the position of the upper mold (21) is arranged on the installation plate (16). A guide mechanism is arranged on the installation plate (16). A material discharge groove (50) is arranged inside the workbench (1) and the material discharge groove (50) is located on one side of the installation plate (16). A drive mechanism for driving the support column (15) to rotate is arranged on the side of the protective cover (13). The drive mechanism includes a second reducer (48) and a power motor (49). The second reducer (48) is fixed on the side of the protective cover (13), and the output end of the second reducer (48) is fixedly connected to one end of the support column (15). The power motor (49) is fixed on the side of the second reducer (48), and the output end of the power motor (49) is fixedly connected to the input end of the second reducer (48). The top of the protective cover (13) is equipped with a purification mechanism.

2. The injection molding device for producing PVC pipe fittings according to claim 1, characterized in that: The conveying mechanism includes a support (2), a screw extruder (3), a conveying shaft (4), a first reducer (5), and a drive motor (6). The support (2) is fixed on the workbench (1), the screw extruder (3) is fixed inside the support (2), the conveying shaft (4) is rotatably disposed inside the screw extruder (3), the first reducer (5) is fixed on the workbench (1), and the first reducer (5) is located on one side of the screw extruder (3). One end of the conveying shaft (4) is fixedly connected to the output end of the first reducer (5), the drive motor (6) is fixed on one side of the first reducer (5), and the output end of the drive motor (6) is fixedly connected to the input end of the first reducer (5). A hopper (7) is installed on the top of the screw extruder (3), and a controller (47) is fixedly disposed on the side of the protective cover (13).

3. The injection molding device for producing PVC pipe fittings according to claim 2, characterized in that: The conveying mechanism also includes a conveying pump (8), a conveying pipe (9), a connecting plate (10), a connector (11), and an electric push rod (12). The conveying pump (8) is fixed on the side of the protective cover (13), and the output end of the screw extruder (3) is connected to the input end of the conveying pump (8). One end of the conveying pipe (9) is connected to the output end of the conveying pump (8). The connector (11) is fixedly connected to the end of the conveying pipe (9). The connecting plate (10) is fixed on the connector (11). The electric push rod (12) is fixed inside the protective cover (13), and the telescopic end of the electric push rod (12) is fixedly connected to the connecting plate (10). The connector (11) is located on the side of the injection head (20).

4. The injection molding device for producing PVC pipe fittings according to claim 3, characterized in that: The guiding mechanism includes an annular groove (17) and a guide ring (18). The annular groove (17) is disposed on the mounting plate (16). The guide ring (18) engages with the annular groove (17) and is fixedly connected to the inner wall of the protective cover (13).

5. The injection molding device for producing PVC pipe fittings according to claim 1, characterized in that: The adjustment mechanism includes a connecting block (22), a guide groove (23), a limiting plate (24), a threaded rod (25), and a servo motor (26). The connecting block (22) is fixed on the side of the upper mold (21). The guide groove (23) corresponding to the upper mold (21) is fixed on the mounting plate (16). The limiting plate (24) passes through the guide groove (23), and the other end of the limiting plate (24) is fixedly connected to the connecting block (22). The threaded rod (25) is threadedly connected to the limiting plate (24). The servo motor (26) is fixed in the guide groove (23), and the output end of the servo motor (26) is fixedly connected to one end of the threaded rod (25).

6. The injection molding device for producing PVC pipe fittings according to claim 5, characterized in that: A guide cylinder (27) is fixedly installed on the upper mold (21), and a guide shaft (28) is inserted inside the guide cylinder (27). A support plate (29) is fixedly installed on the support column (15), and the other end of the guide shaft (28) is fixedly connected to the side of the support plate (29).

7. The injection molding device for producing PVC pipe fittings according to claim 6, characterized in that: A wind ring (30) is fixedly installed on the side of the support plate (29). A nozzle (31) is arranged in a circular array on the wind ring (30). A large gear (32) is fixedly installed on the support column (15). A rotary joint (33) is provided at one end of the support column (15). A connecting pipe (34) is provided inside the support column (15). One end of the connecting pipe (34) is connected to the rotary joint (33), and the other end of the connecting pipe (34) is connected to the wind ring (30).

8. The injection molding device for producing PVC pipe fittings according to claim 7, characterized in that: A bellows (35) is fixedly installed on the support frame (14). A filter screen (36) is fixedly installed on the side of the bellows (35). A fan (37) is fixedly installed inside the bellows (35). A drive shaft (38) is fixedly connected to the impeller inside the fan (37). A small gear (39) is fixedly connected to the end of the drive shaft (38), and the small gear (39) meshes with the large gear (32). An air inlet pipe (41) is connected to the input end of the fan (37), and an air delivery pipe (40) is connected to the output end of the fan (37). The other end of the air delivery pipe (40) is connected to a rotary joint (33).

9. The injection molding device for producing PVC pipe fittings according to claim 1, characterized in that: The purification mechanism includes a purification box (42), a ventilation pipe (43), a filter plate (44), an air duct (45), and an air hood (46). The purification box (42) is fixed to the top of the protective cover (13). The ventilation pipe (43) is fixed to one side of the purification box (42), and the other end of the ventilation pipe (43) is connected to the air inlet pipe (41). The filter plate (44) is fixed inside the purification box (42). The air duct (45) is fixed to the bottom of the purification box (42), and one end of the purification box (42) extends into the protective cover (13). The air hood (46) is connected to the air duct (45), and the air hood (46) is inclined inside.

10. The injection molding device for producing PVC pipe fittings according to claim 4, characterized in that: The mounting plate (16) has grooves (51) arranged in a circumferential array, and the grooves (51) are connected to the annular groove (17). The guide ring (18) has a movable groove (52), and a limiting shaft (53) is symmetrically fixed in the movable groove (52). A sliding plate (54) is provided in the movable groove (52), and the limiting shaft (53) passes through the sliding plate (54). A first spring (56) is arranged around the limiting shaft (53), and the ends of the first spring (56) are fixedly connected to the movable groove (52) and the sliding plate (54) respectively. A magnetic block (55) is fixedly provided in the movable groove (52), and a magnetic block (55) is fixedly provided in the sliding plate (54). 5) Corresponding electromagnet (57), the movable slot (52) is provided with a through slot (62), a striking block (61) is provided in the through slot (62), and one end of the striking block (61) is arc-shaped. A frame (58) is fixedly provided on the sliding plate (54), and one end of the striking block (61) extends into the frame (58). The striking block (61) is convex in shape. A shaft (59) is fixedly provided in the frame (58), and the shaft (59) passes through the striking block (61). A second spring (60) is arranged around the shaft (59), and the ends of the second spring (60) are fixedly connected to the striking block (61) and the sliding plate (54) respectively.

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