Multi-mold-cavity switching forming mechanism for plastic pipe fitting production

Abstract

The invention discloses a multi-mold-cavity switching forming mechanism for plastic pipe fitting production, and belongs to the technical field of plastic pipe fitting production. The multi-mold-cavity switching forming mechanism comprises a rack, two supporting rings are fixed to the upper portion of the rack, and the bottom of a storage barrel communicates with the interior of a forming cavity through an injection molding hole; the air cylinder is mounted in the left end of the rack, and an output shaft of the rack is connected with the switching mechanism; the motor is mounted in the right end of the rack, and an output shaft of the motor is connected with a vibrating mechanism; and the cooling mechanism is arranged at the right end of the forming mold, and the cooling mechanism and the vibrating mechanism are both driven by a motor. According to the multi-mold-cavity switching forming mechanism for plastic pipe fitting production and the same forming device, pipe fittings in different shapes can be machined in a mold cavity switching mode, bubbles in raw materials can be vibrated out after injection molding of the pipe fittings is completed, and then the quality of formed products is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic pipe fitting production, and specifically relates to a multi-cavity switching forming mechanism for plastic pipe fitting production. Background Art

[0002] Plastic is a recyclable material. After waste plastics are recycled and processed, they can be remade into pipe fittings. When producing plastic pipe fittings, the recycled plastics are heated and melted, and then injected into a forming mold, and are formed by extrusion and then cooled, for example, a plastic pipe thermoplastic forming device with the publication number CN213860577U, including a material box, one end of the material box is fixedly communicated with a discharge pipe, a hose is movably sleeved inside the discharge pipe, a forming groove is formed between the inner wall of the discharge pipe and the outer side surface of the hose, and a cylinder is arranged in the middle of the hose. By arranging a cylinder inside the hose, a telescopic rod is movably installed on the outer side surface of the cylinder, and on the telescopic rod, a support plate is fixed at the top of the telescopic rod, and the outer side surface of the support plate is in contact with the inner wall of the hose. When it is necessary to adjust the inner wall thickness of the plastic pipe, the cylinder can be started to drive the movement of the telescopic rod, and then drive the displacement of the support plate to expand the hose and adjust the distance between the hose and the inner wall of the discharge pipe, thereby reducing the area of the forming groove, and thus realizing the advantage of being able to change the wall thickness of the plastic pipe; For example, a forming device for a telescopic plastic pipe with the publication number CN216230660U, which relates to the technical field of plastic pipe production and processing, includes a plastic pipe processing box body, a feed hopper, a forming mold and an extruder. The bottom of the feed hopper is fixedly connected to the top of the plastic pipe processing box body, the bottom of the extruder is fixedly connected to the bottom of the inner wall of the plastic pipe processing box body, the right side of the extruder is fixedly connected to the left side of the forming mold, and a bearing plate is fixedly installed on the right side of the plastic pipe processing box body. By adopting the cooperation of a stirring motor and a mixing shaft, the plastic sol in the pushing box can be stirred more evenly, and a current heating plate arranged on the surface of the pushing box can increase the surface temperature of the pushing box. Under the action of heat conduction, the temperature inside the pushing box can be increased, avoiding excessive heat loss of the plastic sol before extrusion molding, and thus being beneficial to improving the forming effect of the plastic pipe. However, the above-mentioned forming device still has the following disadvantages in actual use: 1. Since the shapes of plastic pipe fittings are different, during the production process, different forming devices are required, and the same forming device cannot realize the processing of different pipe fittings by switching cavities. Therefore, the production of plastic pipe fittings is not convenient enough, increasing the equipment cost; 2. And after the molten plastic raw material is injected into the forming cavity, there will be bubbles in the raw material, and there is a lack of a structure for vibrating out the bubbles, which affects the quality of the pipe fittings after forming.

[0003] In view of the above problems, it is urgent to innovate and design on the basis of the original forming mechanism. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-cavity switching forming mechanism for plastic pipe fittings production, so as to solve the problems in the above background technology that the same forming device cannot realize the processing of different pipe fittings by switching the cavities, and there is a lack of a structure for vibrating out air bubbles.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A multi-cavity switching forming mechanism for plastic pipe fittings production, including a frame, two support rings are fixed above the frame, and a forming mold is installed through the inside of the support rings, and the bottom of the left support ring is connected to the bottom of the material storage barrel. An injection hole is opened at the top of the left support ring, and the bottom of the material storage barrel is interconnected with the inside of the forming cavity through the injection hole, and the forming cavities are arranged at equal angles inside the forming mold; It further includes: a cylinder, installed inside the left end of the frame, the output shaft of the frame is connected to the switching mechanism, and the switching mechanism drives a single rotation of 90° to switch different forming cavities; A motor, installed inside the right end of the frame, the output shaft of the motor is connected to the vibrating mechanism, and the vibrating mechanism is used to eliminate air bubbles in the forming cavity; A cooling mechanism, arranged at the right end of the forming mold, both the cooling mechanism and the vibrating mechanism are driven by the motor, and the cooling mechanism is arranged above the vibrating mechanism.

[0006] Preferably, the switching mechanism includes a rack fixed on the output shaft of the cylinder, and a first gear is meshed on the side of the rack, and the bottom of the rack is higher than the center point of the first gear, and the first gear is arranged at the left end of the forming mold through a rotating shaft, and at the same time, a one-way bearing is connected between the first gear and its rotating shaft. By driving the cylinder, the rack can be driven to descend and mesh with the first gear to drive the forming mold to rotate.

[0007] Preferably, one end of the output shaft side of the cylinder is fixedly connected to one end of a connecting rod, and the other end of the connecting rod is engaged with a limiting hole, and the limiting holes are arranged at equal angles at the left end of the forming mold, and at the same time, the number of limiting holes is equal to the number of forming cavities. Before the rack meshes with the first gear, it first drives the connecting rod to separate from the limiting hole.

[0008] Preferably, the vibrating mechanism includes a fixed cylinder arranged at the center of the forming mold, and the fixed cylinder is rotatably connected to the forming mold, and a transmission shaft is connected to the fixed cylinder through a bearing. When the forming mold rotates, the fixed cylinder remains stationary, while the transmission shaft can rotate in the fixed cylinder.

[0009] Preferably, two thread grooves with opposite directions are arranged on the outer side of the transmission shaft, and the transmission shaft is in threaded connection with the movable plate. The outer wall of the movable plate is in sliding fit with the inner wall of the fixed cylinder. At the same time, a movable rod slides through the top of the movable plate. When the transmission shaft rotates, it can drive the movable plate to reciprocate inside the fixed cylinder.

[0010] Preferably, a spring for resetting is wound around the outer side of the movable rod, and a connecting block is fixed to the top of the movable rod. The upper part of the connecting block is in contact with the fixed block. At the same time, the fixed blocks are fixedly arranged at equal intervals on the inner top surface of the fixed cylinder. When the movable plate moves, it drives the connecting block to contact the fixed block, and generates vibration through the impact between the connecting block and the fixed cylinder to vibrate out the bubbles.

[0011] Preferably, the cooling mechanism includes a fan blade fixedly installed on the output shaft of the motor. A fixed box is sleeved outside the fan blade, and the fixed box is fixed on the frame. At the same time, the top of the fixed box is connected to the discharge cylinder through an air delivery pipe. The gas generated by the rotation of the fan blade can be transmitted to the cavity of the discharge cylinder through the air delivery pipe.

[0012] Preferably, the discharge cylinder corresponds to the uppermost forming cavity. The inner wall of the discharge cylinder is provided with a cavity, and the cavity on the inner wall of the discharge cylinder is communicated with the fixed box through an air delivery pipe. At the same time, a connecting plate is fixed at one end of the air delivery pipe close to the discharge cylinder. When the discharge cylinder rotates, the connecting plate and the air delivery pipe remain stationary, which will not affect the gas transmission.

[0013] Preferably, the connecting plate and the discharge cylinder are in rotational connection. The inner wall of the discharge cylinder is uniformly provided with air outlet holes. The discharge cylinder rotates through the support plate. At the same time, the fixed cylinder is fixed at the bottom of the support plate, and the support plate is fixed on the support ring at the right end. The gas entering the discharge cylinder can finally be discharged from the air outlet holes and blown onto the pipe fittings to accelerate the molding.

[0014] Preferably, tooth blocks are fixedly arranged at equal angles on the outer wall of the discharge cylinder, and a second gear is meshed below the tooth blocks. The second gear is fixedly sleeved on the end of the transmission shaft. At the same time, the end of the transmission shaft is connected to the output shaft of the motor through a pulley mechanism. Through the meshing transmission between the second gear and the tooth blocks, the discharge cylinder can be driven to rotate on the support plate to realize multi-directional gas discharge.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: for the multi-cavity switching molding mechanism for plastic pipe fitting production, with the same molding device, by switching the mold cavities, the processing of pipe fittings with different shapes can be realized. And after the pipe fittings are injection molded, the bubbles in the raw materials can be vibrated out, thereby ensuring the quality of the molded products. The specific content is as follows: 1. The operation of the air cylinder drives the rack and the connecting rod to descend synchronously. First, it drives the connecting rod to separate from the limit hole. In this way, the rack can continue to descend and contact the first gear, and drives the forming die to rotate 90° through the meshing transmission between the two, realizing the switching of the forming cavity. Since the first gear and its rotating shaft are connected through a one-way bearing, the first gear will not be driven to rotate during the ascending process of the rack, so the position of the forming die will not change after rotation. Then, it drives the connecting rod to engage with the corresponding limit hole to ensure the stability of the position of the forming die; 2. Through the threaded transmission between the transmission shaft and the movable plate, the movable plate is driven to reciprocate in the fixed cylinder. During the movement, the connecting block can contact the fixed block. When the two no longer contact, the elasticity of the spring can drive the connecting block to knock on the inner top surface of the fixed cylinder, and then the bubbles are discharged through the generated vibration. When the forming die rotates, the fixed cylinder can remain stationary. On the one hand, it will not affect the transmission of the transmission shaft, and on the other hand, it can ensure that the connecting block always knocks on the inner top surface of the fixed cylinder; 3. The gas generated by the rotation of the fan blade can be transmitted to the cavity of the discharge cylinder through the air delivery pipe, and then discharged from the air outlet holes and blown onto the formed pipe fittings, which can accelerate its cooling and ensure shaping. When the transmission shaft rotates, it drives the second gear to rotate synchronously, and then drives the discharge cylinder to rotate on the support plate through the meshing transmission between the second gear and the tooth block. In this way, when the gas is discharged, the rotation of the discharge cylinder can increase the blowing range to ensure the comprehensiveness of the cooling of the pipe fittings. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the forming die of the present invention; Figure 3 It is a schematic diagram of the connection structure between the rack and the first gear of the present invention; Figure 4 It is a schematic cross-sectional view of the present invention; Figure 5 It is a schematic cross-sectional view of the fixed box of the present invention; Figure 6 It is a schematic diagram of the connection structure between the tooth block and the second gear of the present invention; Figure 7 It is a schematic cross-sectional view of the discharge cylinder of the present invention; Figure 8 It is a schematic rear view of the present invention; Figure 9 It is a schematic cross-sectional view of the forming die of the present invention; Figure 10 It is a schematic diagram of the structure of the movable plate of the present invention.

[0017] In the figure: 1, frame; 2, support ring; 3, forming die; 4, material storage barrel; 5, injection hole; 6, forming cavity; 7, cylinder; 8, rack; 9, first gear; 10, connecting rod; 11, limit hole; 12, motor; 13, transmission shaft; 14, movable plate; 15, movable rod; 16, connecting block; 17, fixed cylinder; 18, fixed block; 19, fan blade; 20, fixed box; 21, air delivery pipe; 22, discharge barrel; 23, connecting plate; 24, air outlet hole; 25, support plate; 26, tooth block; 27, second gear. Specific implementation manner

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 10 , the present invention provides the following technical solutions: Embodiment 1: In order to solve the problems existing in the prior art, therefore, in this embodiment, through the following technical solutions, a multi-cavity switching forming mechanism for plastic pipe fittings production includes a frame 1. Two support rings 2 are fixed above the frame 1, and a forming die 3 is installed through the inside of the support rings 2. And the left support ring 2 is connected to the bottom of the material storage barrel 4. An injection hole 5 is opened at the top of the left support ring 2. The bottom of the material storage barrel 4 is interconnected with the inside of the forming cavity 6 through the injection hole 5. And the forming cavities 6 are arranged at equal angles inside the forming die 3; It also includes: a cylinder 7, installed inside the left end of the frame 1. The output shaft of the frame 1 is connected to the switching mechanism, and the switching mechanism drives a single rotation of 90° to switch different forming cavities 6; a motor 12, installed inside the right end of the frame 1. The output shaft of the motor 12 is connected to the vibrating mechanism, and the vibrating mechanism is used to eliminate the air bubbles in the forming cavity 6; a cooling mechanism, arranged at the right end of the forming die 3. The cooling mechanism and the vibrating mechanism are both driven by the motor 12, and the cooling mechanism is arranged above the vibrating mechanism.

[0020] Since the shapes of plastic pipe fittings are different, during the production process, different forming devices are required. The same forming device cannot realize the processing of different pipe fittings by switching the mold cavity. Therefore, the production of plastic pipe fittings is not convenient enough, increasing the cost of the equipment, such as Figures 1 - 4As shown in the figure, the switching mechanism includes a rack 8 fixed to the output shaft of the cylinder 7. A first gear 9 is meshed and connected to the side of the rack 8. The bottom of the rack 8 is higher than the center point of the first gear 9. The first gear 9 is arranged at the left end of the molding die 3 through a rotating shaft, and the first gear 9 and its rotating shaft are connected through a one-way bearing. One end of the output shaft side of the cylinder 7 is fixedly connected to one end of the connecting rod 10, and the other end of the connecting rod 10 is engaged with the limiting hole 11. The limiting holes 11 are equally angled and opened at the left end of the molding die 3, and the number of the limiting holes 11 is equal to that of the molding cavities 6. The material in the storage barrel 4 can enter the corresponding molding cavity 6 through the injection hole 5, and then be discharged after extrusion and cooling. When it is necessary to replace different molding cavities 6, the cylinder 7 operates to drive the rack 8 to descend, driving the connecting rod 10 to descend synchronously. First, the connecting rod 10 is separated from the limiting hole 11. In this way, when the rack 8 continues to descend, it can contact the first gear 9, and drive the molding die 3 to rotate through the meshing transmission between the two. When the rack 8 descends once, it can drive the first gear 9 to rotate 90°, so as to drive the molding die 3 to rotate 90°, realizing the switching of the molding cavity 6. The corresponding molding cavity 6 is docked with the storage barrel 4 through the injection hole 5. After the adjustment is completed, the cylinder 7 drives the rack 8 to rise. Since the first gear 9 and its rotating shaft are connected through a one-way bearing, the first gear 9 will not be driven to rotate during the rising process of the rack 8, so the position of the molding die 3 will not change after rotation. Then, the connecting rod 10 is driven to be engaged with the corresponding limiting hole 11 to ensure the stability of the position of the molding die 3.

[0021] Embodiment 2: After the molten plastic raw material is injected into the molding cavity 6, there will be bubbles in the raw material, and there is no structure for vibrating out the bubbles, which affects the quality of the formed pipe fittings. Therefore, this embodiment adopts the following technical solutions, such as Figures 4 - 6 and Figures 9 - 10As shown, the vibrating mechanism includes a fixed cylinder 17 arranged at the center of the molding die 3, and the fixed cylinder 17 and the molding die 3 are rotatably connected, and the transmission shaft 13 and the fixed cylinder 17 are bearing-connected; two threaded grooves in opposite directions are arranged on the outer side of the transmission shaft 13, and the transmission shaft 13 and the movable plate 14 are threadedly connected, and the outer wall of the movable plate 14 fits and slides with the inner wall of the fixed cylinder 17, and at the same time, a movable rod 15 slides through the top of the movable plate 14; a spring for returning the movable rod 15 is wound around the outer side of the movable rod 15, and a connecting block 16 is fixed on the top of the movable rod 15, and the upper part of the connecting block 16 is in contact with the fixed block 18, and at the same time, the fixed block 18 is fixed to the inner top surface of the fixed cylinder 17 at equal intervals; after the material is injected into the molding cavity 6, the motor 12 runs, and its output shaft drives the transmission shaft 13 to rotate through the pulley mechanism, and then Afterwards, the threaded transmission of the transmission shaft 13 and the movable plate 14 drives the movable plate 14 to move reciprocatingly horizontally in the fixed cylinder 17. During the movement, the connecting block 16 can contact the fixed block 18, and the interference between the two can drive the movable rod 15 to slide on the movable plate 14. When the connecting block 16 is not in contact with the fixed block 18, the elasticity of the spring can drive the connecting block 16 to knock on the inner top surface of the fixed cylinder 17, and then the bubbles are discharged through the generated vibration to improve the product quality. Since the fixed cylinder 17 is fixed on the support plate 25, and the support plate 25 is fixed on the stationary support ring 2, the fixed cylinder 17 can remain stationary when the molding mold 3 rotates. On the one hand, it will not affect the transmission of the transmission shaft 13. On the other hand, it can ensure that the connecting block 16 always knocks on the inner top surface of the fixed cylinder 17 to knock on the molding cavity 6 filled with material.

[0022] Embodiment 3: The existing forming device is not efficient enough in cooling the pipe after forming, which makes the pipe easy to deform. The cooling position and angle of the pipe are relatively simple. Therefore, this embodiment adopts the following technical solutions, such as Figures 5 - 8As shown, the cooling mechanism includes a fan blade 19 fixedly installed on the output shaft of the motor 12. A fixed box 20 is sleeved outside the fan blade 19, and the fixed box 20 is fixed on the frame 1. At the same time, the top of the fixed box 20 is connected to the discharge cylinder 22 through an air delivery pipe 21; the discharge cylinder 22 corresponds to the uppermost forming cavity 6. A cavity is provided on the inner wall of the discharge cylinder 22, and the cavity on the inner wall of the discharge cylinder 22 is communicated with the fixed box 20 through the air delivery pipe 21. At the same time, a connecting plate 23 is fixed at one end of the air delivery pipe 21 close to the discharge cylinder 22; the connecting plate 23 is rotatably connected to the discharge cylinder 22. The inner wall of the discharge cylinder 22 is evenly provided with air outlet holes 24, and the discharge cylinder 22 rotatably penetrates through the support plate 25. At the same time, a fixed cylinder 17 is fixed at the bottom of the support plate 25, and the support plate 25 is fixed on the support ring 2 at the right end; the outer wall of the discharge cylinder 22 is fixedly provided with tooth blocks 26 at equal angles, and a second gear 27 is meshed and connected below the tooth blocks 26. The second gear 27 is fixedly sleeved on the end of the transmission shaft 13. At the same time, the end of the transmission shaft 13 is connected to the output shaft of the motor 12 through a pulley mechanism; when the motor 12 operates, it can also drive the fan blade 19 to rotate. The gas generated by the rotation of the fan blade 19 can be transmitted to the cavity of the discharge cylinder 22 through the air delivery pipe 21, and then discharged from the air outlet holes 24 and blown onto the formed pipe fittings, which can accelerate their cooling and ensure shaping. The discharge cylinder 22 is always docked with the uppermost forming cavity 6. Therefore, after the pipe fittings are formed, they can pass through the discharge cylinder 22. When the transmission shaft 13 rotates, it drives the second gear 27 to rotate synchronously. Then, through the meshing transmission of the second gear 27 and the tooth blocks 26, the discharge cylinder 22 can be driven to rotate on the support plate 25. In this way, when the gas is discharged from the air outlet holes 24, the blowing range can be increased through the rotation of the discharge cylinder 22 to ensure that the pipe fittings are cooled comprehensively. When the discharge cylinder 22 rotates, the connecting plate 23 remains stationary inside it, so that it will not affect the gas transmission between the air delivery pipe 21 and the discharge cylinder 22.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-cavity switching molding mechanism for producing plastic pipe fittings, comprising a frame (1), two support rings (2) are fixed on the top of the frame (1), and a molding mold (3) is installed inside the support ring (2), and the support ring (2) at the left end is connected to the bottom of a storage barrel (4), and an injection hole (5) is opened on the top of the support ring (2) at the left end, and the bottom of the storage barrel (4) is connected to the inside of a molding cavity (6) through the injection hole (5), and the molding cavity (6) is arranged at an equal angle inside the molding mold (3); It is characterized in that Also includes: The cylinder (7) is installed inside the left end of the frame (1), the output shaft of the frame (1) is connected to the switching mechanism, and the switching mechanism is driven to rotate 90 degrees in a single time to switch between different molding cavities (6); A motor (12) is installed inside the right end of the frame (1), the output shaft of the motor (12) is connected to a vibration mechanism, and the vibration mechanism is used to eliminate bubbles in the molding cavity (6); A cooling mechanism is arranged at the right end of the molding die (3); the cooling mechanism and the vibrating mechanism are both driven by an electric motor (12), and the cooling mechanism is arranged above the vibrating mechanism.

2. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 1, characterized in that: The switching mechanism comprises a rack (8) fixed on the output shaft of the cylinder (7), and the side of the rack (8) is meshedly connected with a first gear (9), and the bottom of the rack (8) is higher than the center point of the first gear (9), and the first gear (9) is arranged at the left end of the molding die (3) via a rotating shaft, and the first gear (9) and its rotating shaft are connected via a one-way bearing.

3. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 2, characterized in that: The output shaft side of the cylinder (7) is fixedly connected to one end of the connecting rod (10), and the other end of the connecting rod (10) is engaged with the limiting hole (11), and the limiting holes (11) are opened at equal angles at the left end of the molding die (3), and the number of the limiting holes (11) is equal to that of the molding cavity (6).

4. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 1, characterized in that: The vibrating mechanism comprises a fixed cylinder (17) arranged at the center of the forming mold (3), the fixed cylinder (17) and the forming mold (3) are rotatably connected, and the transmission shaft (13) and the fixed cylinder (17) are bearing-connected.

5. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 4, characterized in that: The outer side of the transmission shaft (13) is provided with two thread grooves in opposite directions, and the transmission shaft (13) and the movable plate (14) are threadedly connected, and the outer wall of the movable plate (14) slides in contact with the inner wall of the fixed cylinder (17), and a movable rod (15) slides through the top of the movable plate (14).

6. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 5, characterized in that: A spring for returning the movable rod (15) is wound around the outside of the movable rod (15), and a connecting block (16) is fixed to the top of the movable rod (15). The top of the connecting block (16) is in contact with a fixed block (18), and the fixed block (18) is fixed to the inner top surface of the fixed cylinder (17) at equal intervals.

7. The multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 1, characterized in that: The cooling mechanism comprises a fan blade (19) fixedly mounted on an output shaft of the motor (12), a fixing box (20) is sleeved on the outer side of the fan blade (19), and the fixing box (20) is fixed on the frame (1), and the top of the fixing box (20) is connected to the discharge barrel (22) via an air pipe (21).

8. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 7, characterized in that: The discharge barrel (22) corresponds to the uppermost molding cavity (6), and a cavity is provided on the inner wall of the discharge barrel (22). The cavity on the inner wall of the discharge barrel (22) is connected to each other through an air supply pipe (21) and a fixing box (20), and a connecting plate (23) is fixed to one end of the air supply pipe (21) close to the discharge barrel (22).

9. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 8, characterized in that: The connecting plate (23) and the discharge barrel (22) are rotatably connected, and the inner wall of the discharge barrel (22) is evenly reserved with air outlet holes (24), and the discharge barrel (22) rotates through the support plate (25), while the fixed barrel (17) is fixed to the bottom of the support plate (25), and the support plate (25) is fixed to the support ring (2) at the right end.

10. A multi-cavity switching molding mechanism for producing plastic pipe fittings according to claim 9, characterized in that: A tooth block (26) is fixed at an equal angle on the outer wall of the discharge barrel (22), and a second gear (27) is meshedly connected below the tooth block (26). The second gear (27) is fixedly sleeved on the end of the transmission shaft (13), and the end of the transmission shaft (13) is connected to the output shaft of the motor (12) through a pulley mechanism.

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