Plastic injection molding device for pipe production

Abstract

The application discloses a plastic injection forming device for pipe production, and relates to the technical field of plastic pipe production, which comprises a base, a supporting frame welded to the outer wall of the top of the base, a plastic injection machine and a plastic pipe forming machine, the plastic pipe forming machine comprises a forming die and a high-efficiency cooling mechanism, the plastic injection machine comprises a heating cylinder, an injection head, a feeding bin fixedly communicated with the heating cylinder through a feeding pipe, a plastic smashing mechanism arranged on the feeding bin and an electric screw rod mechanism arranged on the heating cylinder. The plastic smashing mechanism is arranged, the volume of the plastic raw material is reduced by smashing the plastic raw material, the pushing effect of the spiral conveying blade rotating in the discharging pipe is matched, the situation that the plastic raw material is blocked during feeding can be effectively avoided, the feeding efficiency of the plastic raw material is improved, and the plastic raw material can move more smoothly in the extrusion screw rod, and the extrusion efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe fitting production, in particular to a plastic injection molding device for pipe fitting production. Background Art

[0002] A plastic injection molding machine is a device used for mass production of plastic products. It heats plastic pellets until they are molten and injects them into a closed mold under high pressure. After cooling and solidifying, the pellets are formed into the desired shape. This molding method is suitable for almost all thermoplastics and some thermosetting plastics, and is capable of producing plastic products with complex shapes and precise dimensions.

[0003] However, existing plastic injection molding devices for pipe production are prone to blockage during the feeding stage, which affects the feeding efficiency, and are prone to low cooling efficiency during the mold forming stage, which affects the molding efficiency of plastic pipes. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a plastic injection molding device for pipe fitting production, which effectively solves the problem that the existing plastic injection molding device is prone to blockage during the feeding stage, thereby affecting the feeding efficiency, and the problem that the cooling efficiency is low during the mold forming stage, thereby affecting the molding efficiency of plastic pipe fittings.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A plastic injection molding device for pipe fitting production, comprising a base, a support frame welded to the top outer wall of the base, a plastic injection machine, and a plastic pipe fitting molding machine, wherein the plastic pipe fitting molding machine comprises a molding die and a high-efficiency cooling mechanism;

[0007] The plastic injection machine includes a heating barrel welded to the outer wall of the top of the support frame, an injection head fixedly connected to one side of the heating barrel, a feed bin fixedly connected to the heating barrel through a feed pipe, a plastic crushing mechanism provided on the feed bin, and an electric screw mechanism provided on the heating barrel;

[0008] The electric screw mechanism includes a positioning plate fixedly connected to the other side of the heating barrel, an extrusion screw rotatably mounted on the positioning plate and located in the heating barrel, a protective cover fixedly connected to the side wall of the positioning plate, a drive motor fixedly mounted on the top outer wall of the protective cover, a driving bevel gear fixedly sleeved on the output shaft of the drive motor, and a driven bevel gear fixedly sleeved on one end of the extrusion screw;

[0009] The plastic crushing mechanism comprises two crushing assemblies and a driving assembly, each of the two crushing assemblies comprises a crushing shaft rotatably arranged in the feeding bin and two crushing rollers fixedly sleeved on the crushing shaft, and the driving assembly comprises a mounting rod fixedly connected to the top outer wall of the feeding bin, a crushing motor fixedly arranged on the top outer wall of the mounting rod, a transmission shaft coaxially fixedly connected to the output shaft of the crushing motor through a shaft coupling, a worm fixedly sleeved on the upper portion of the transmission shaft, and worm gears fixedly sleeved on the middle regions of the two crushing shafts in sequence.

[0010] The forming mold comprises a fixed mold base and a bearing plate fixedly connected to the top outer wall of the base in sequence, a plurality of fixed mold cores fixedly arranged on the fixed mold base and uniformly distributed, a gas cylinder fixedly arranged on the side wall of the bearing plate, a movable mold base fixedly connected to the piston end of the gas cylinder, and movable mold cores fixedly arranged on the movable mold base and matched with the fixed mold cores, and the same injection pipeline is fixedly communicated between all the fixed mold cores and the injection head.

[0011] Preferably, the output shaft of the driving motor penetrates the top of the protective cover, and the driving bevel gear and the driven bevel gear are in meshing engagement with each other and are located in the protective cover.

[0012] Preferably, one side of the positioning plate is welded with four threaded pins, one side of the heating cylinder is welded with a connecting plate, the four corners of the connecting plate are provided with pin holes, the four threaded pins are respectively inserted into the four pin holes in a corresponding manner, and the four threaded pins are respectively screwed with butterfly nuts.

[0013] Preferably, the worm is located between the two worm gears, the two worm gears are in meshing engagement with the worm, and the lower outer wall of the transmission shaft is welded with helical conveying blades located in the feeding pipe.

[0014] Preferably, four guide shafts are welded between the fixed mold base and the bearing plate, four sliding holes are formed at the four corners of the movable mold base, and the four sliding holes are respectively in sliding connection with the four guide shafts.

[0015] Preferably, the high-efficiency cooling mechanism comprises a heat dissipation shell fixedly connected to the side wall of the fixed mold base, a condensing square tube fixedly penetrating into the heat dissipation shell, a plurality of heat dissipation assemblies uniformly arranged on the condensing square tube, and an output pump, a refrigeration water tank and a return pump fixedly connected to the top outer wall of the heat dissipation shell in sequence.

[0016] Preferably, the liquid suction end of the output pump is in communication with one side of the refrigeration water tank, the liquid delivery end of the output pump is in communication with one end of the condensing square tube, and the liquid delivery end of the output pump and one end of the condensing square tube are fixedly connected through two first sealing flanges, the liquid delivery end of the return pump is in communication with the other side of the refrigeration water tank, the liquid suction end of the return pump is in communication with the other end of the condensing square tube, and the liquid suction end of the return pump and the other end of the condensing square tube are fixedly connected through two second sealing flanges.

[0017] Preferably, the heat dissipation assembly includes a shaft connected to the condensing square tube through a sealed bearing, an impeller fixedly connected to one end of the shaft and located in the condensing square tube, a heat dissipation hole opened on one side of the heat dissipation shell, and a heat dissipation fan blade fixedly connected to the other end of the shaft and located in the heat dissipation hole.

[0018] Preferably, the support frame is provided with a cylinder wall cleaning mechanism, and the cylinder wall cleaning mechanism includes a motor support plate welded to the side wall of the support frame, a servo motor fixedly mounted on the top outer wall of the motor support plate, a lead screw rotatably mounted on the support frame, a reciprocating slide rod threadedly connected to the lead screw, a cleaning ring fixedly connected to the top outer wall of the reciprocating slide rod, and a guide cross shaft welded to the support frame.

[0019] Preferably, the output shaft of the servo motor is coaxially fixedly connected to one end of the screw through a coupling, and a guide hole is provided on the reciprocating slide rod which is slidably connected to the guide horizontal axis. The cleaning ring is coaxially arranged with the heating barrel, and the inner wall of the cleaning ring is provided with bristles distributed in an annular manner and in contact with the outer wall of the heating barrel.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention is provided with a plastic crushing mechanism, which reduces the volume of the plastic raw material by crushing it and cooperates with the pushing effect of the spiral conveying blade located in the discharge pipe and rotating, which can effectively avoid blockage during the feeding process of the plastic raw material, thereby improving the feeding efficiency of the plastic raw material. By reducing the volume of the plastic raw material, it can move more smoothly in the extrusion screw, thereby improving the extrusion efficiency;

[0022] 2. The present invention cooperates with the positioning plate, threaded pins and butterfly nuts. By simply unscrewing the four butterfly nuts, the positioning plate can be removed from the connecting plate, thereby facilitating the disassembly and cleaning of the extrusion screw.

[0023] 3. The present invention is provided with a high-efficiency cooling mechanism. First, through the coordinated cooperation of the refrigeration water tank, the output pump and the return pump, the cooling water in the refrigeration water tank can circulate in the condensing square tube, thereby achieving a circulating cooling effect. Secondly, under the action of the water flow in the condensing square tube, the impeller can rotate, prompting the heat dissipation fan blades on the shaft to rotate to dissipate heat. In this way, through the operation of all the heat dissipation components, the heat emitted by the fixed mold core during the cooling process can be further quickly dissipated to the outside, thereby effectively improving the cooling efficiency of the fixed mold core and helping to improve the molding efficiency of plastic pipe fittings.

[0024] 4. The present invention uses water flow as a power source, so that all the heat dissipation components on the heat dissipation shell do not need to be driven by an external driving source, which is more energy-saving, economical and practical;

[0025] 5. The present invention is provided with a barrel wall cleaning mechanism. The bristles evenly distributed on the inner wall of the cleaning ring reciprocate on the barrel wall of the heating barrel, which can automatically and effectively clean the dust and other impurities attached to the surface, thereby helping to improve the heat conduction efficiency of the heating barrel and ensure that the plastic material can be fully and evenly heated inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0027] Figure 2 It is a front view structural schematic diagram of the present invention as a whole;

[0028] Figure 3 It is a schematic diagram of the vertical cross-section structure of the plastic injection machine of the present invention;

[0029] Figure 4 It is a three-dimensional enlarged structural diagram of the positioning plate in the present invention;

[0030] Figure 5 This is a schematic diagram of the three-dimensional enlarged structure of the interior of the protective cover in the present invention;

[0031] Figure 6 It is a schematic diagram of the three-dimensional enlarged structure of two crushing component areas in the present invention;

[0032] Figure 7 It is a three-dimensional enlarged structural diagram of the driving component in the present invention;

[0033] Figure 8 This is a schematic diagram of a three-dimensional enlarged structure after the movable mold core and the four guide shafts are separated in the present invention;

[0034] Figure 9 It is a schematic diagram of the three-dimensional exploded structure of the plastic pipe forming machine of the present invention;

[0035] Figure 10 This is a three-dimensional enlarged structural diagram of the connection between the heat dissipation component and the condensation square tube in the present invention;

[0036] Figure 11 Schematic diagram of the side structure of the plastic molding machine of the present invention;

[0037] Figure 12 It is a schematic diagram of the three-dimensional enlarged structure of the cleaning ring in the present invention.

[0038] In the figure: 1. Base; 2. Support frame; 3. Heating barrel; 4. Injection head; 5. Feed bin; 6. Extrusion screw; 7. Positioning plate; 8. Protective cover; 9. Driving motor; 10. Active bevel gear; 11. Driven bevel gear; 12. Threaded pin; 13. Butterfly nut; 14. Crushing shaft; 15. Crushing roller; 16. Mounting rod; 17. Crushing motor; 18. Transmission shaft; 19. Worm; 20. Worm gear; 21. Spiral conveying blade; 22. Fixed mold base; 23. Fixed mold core; 24. Loading plate; 25. Cylinder; 26. Moving mold base; 27. Moving mold core; 28. Guide shaft; 29. ​​Heat dissipation shell; 30. Condensation square tube; 31. Refrigeration water tank; 32. Output pump; 33. Reflux pump; 34. Shaft; 35. Impeller; 36. Cooling fan blade; 37. Servo motor; 38. Screw; 39. Reciprocating slide; 40. Cleaning ring; 41. Brush; 42. Guide horizontal axis; 43. Injection pipeline. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] Example 1, reference Figure 1-9 A plastic injection molding device for pipe production includes a base 1, a support frame 2 welded to the top outer wall of the base 1, a plastic injection machine and a plastic pipe molding machine, wherein the plastic pipe molding machine includes a molding mold and a high-efficiency cooling mechanism;

[0041] In this embodiment, the plastic injection machine includes a heating barrel 3 welded to the top outer wall of the support frame 2, an injection head 4 fixedly connected to one side of the heating barrel 3, a feed bin 5 fixedly connected to the heating barrel 3 through a feed pipe, a plastic crushing mechanism provided on the feed bin 5, and an electric screw mechanism provided on the heating barrel 3;

[0042] Furthermore, the electric screw mechanism includes a positioning plate 7 fixedly connected to the other side of the heating barrel 3, an extrusion screw 6 rotatably mounted on the positioning plate 7 and located in the heating barrel 3, a protective cover 8 fixedly connected to the side wall of the positioning plate 7, a drive motor 9 fixedly mounted on the top outer wall of the protective cover 8, a driving bevel gear 10 fixedly sleeved on the output shaft of the drive motor 9, and a driven bevel gear 11 fixedly sleeved on one end of the extrusion screw 6;

[0043] Further, the output shaft of the driving motor 9 penetrates the top of the protective cover 8, the driving bevel gear 10 and the driven bevel gear 11 are in meshing with each other and are located in the protective cover 8, the four corners of one side of the positioning plate 7 are welded with threaded pins 12, one side of the heating cylinder 3 is welded with a connecting plate, the four corners of the connecting plate are provided with pin holes, the four threaded pins 12 are respectively inserted into the four pin holes, and the four threaded pins 12 are all threadedly connected with butterfly nuts 13.

[0044] When the electric screw mechanism is disassembled, the positioning plate 7 can be taken off from the connecting plate only by screwing off the four butterfly nuts 13, so that the extrusion screw 6 can be conveniently disassembled and cleaned.

[0045] Further, the plastic crushing mechanism comprises two crushing assemblies and a driving assembly, the two crushing assemblies each comprise a crushing shaft 14 rotatably installed in the feeding bin 5 and two crushing rollers 15 fixedly sleeved on the crushing shaft 14, and the driving assembly comprises an installation rod 16 fixedly connected to the top outer wall of the feeding bin 5, a crushing motor 17 fixedly installed on the top outer wall of the installation rod 16, a transmission shaft 18 coaxially fixedly connected with the output shaft of the crushing motor 17 through a shaft coupling, a worm 19 fixedly sleeved on the upper portion of the transmission shaft 18, and a worm wheel 20 fixedly sleeved on the middle region of the two crushing shafts 14.

[0046] Further, the worm 19 is located between the two worm wheels 20, the two worm wheels 20 are in meshing with the worm 19, and the lower outer wall of the transmission shaft 18 is welded with helical conveying blades 21 located in the feeding pipe. Through the meshing transmission of the worm 19 and the two worm wheels 20, not only the reverse rotation of the two crushing shafts 14 is realized, but also the rotation of the helical conveying blades 21 on the transmission shaft 18 is realized, and the same driving device is used for control, so that the number of driving devices is reduced.

[0047] In the embodiment, the forming mold comprises a fixed mold seat 22 and a bearing plate 24 which are fixedly connected to the top outer wall of the base 1 in sequence, a plurality of fixed mold cores 23 which are fixedly installed on the fixed mold seat 22 and are uniformly distributed, a gas cylinder 25 which is fixedly installed on the side wall of the bearing plate 24, a movable mold seat 26 which is fixedly connected to the piston end of the gas cylinder 25, and a movable mold core 27 which is fixedly installed on the movable mold seat 26 and is used in cooperation with the fixed mold core 23, and all the fixed mold cores 23 and the injection head 4 are fixedly communicated with the same injection pipeline 43.

[0048] Further, four guide shafts 28 are welded between the fixed mold seat 22 and the bearing plate 24, and four sliding holes are formed in the four corners of the movable mold seat 26, and the four sliding holes are slidably connected with the four guide shafts 28, so that the stability of the mold closing process of the fixed mold seat 22 and the movable mold seat 26 can be ensured through the guidance of the four guide shafts 28.

[0049] During the specific implementation of this embodiment: first, the transmission shaft 18 is driven to rotate by the crushing motor 17, and then the worm 19 and the spiral conveying blade 21 on the transmission shaft 18 will rotate synchronously, and then the two worm gears 20 engaged with the worm 19 will drive the two crushing shafts 14 to rotate in opposite directions, and then the two sets of crushing rollers 15 on the two crushing shafts 14 can rotate relative to each other to fully crush the plastic raw material added to the feed bin 5. Then, by crushing the plastic raw material to reduce the volume of the plastic raw material and cooperating with the pushing effect of the spiral conveying blade 21 located in the discharge pipe and rotating, it can effectively avoid the blockage of the plastic raw material feeding process, which is beneficial to improving the feeding efficiency of the plastic raw material, and by reducing the volume of the plastic raw material, it can move more smoothly in the extrusion screw 6, thereby improving the extrusion efficiency;

[0050] Secondly, the driving motor 9 controls the driving bevel gear 10 to rotate, and then the driven bevel gear 11 meshing with the driving bevel gear 10 drives the extrusion screw 6 to rotate, thereby pushing the plastic raw material entering from the discharge pipe forward. During the pushing process, the plastic raw material contacts the inner wall of the heating barrel 3 and is heated and melted;

[0051] Finally, the heated and molten plastic raw material is extruded from the injection head 4 and injected into each fixed mold core 23 through the injection pipe 43, so that the molten plastic fills the space between the fixed mold core 23 and the movable mold core 27 to form a plastic pipe fitting. After cooling is completed, the movable mold base 26 is controlled by the cylinder 25 to move backward for subsequent demolding operations.

[0052] Example 2, reference Figure 1-2 and Figure 8-11 This embodiment is optimized based on the first embodiment. Specifically, the efficient cooling mechanism includes a heat dissipation shell 29 fixedly connected to the side wall of the fixed mold base 22, a condensing square tube 30 fixed through the heat dissipation shell 29, a plurality of heat dissipation components evenly distributed on the condensing square tube 30, and an output pump 32, a cooling water tank 31, and a reflux pump 33 fixedly connected to the top outer wall of the heat dissipation shell 29 in sequence. The condensing square tube 30 is a serpentine curved tube structure, and the outer walls of all the fixed mold cores 23 are in contact with the tube wall of the condensing square tube 30.

[0053] Furthermore, the liquid extraction end of the output pump 32 is communicated with one side of the refrigeration water tank 31, the liquid delivery end of the output pump 32 is communicated with one end of the condensing square tube 30, and the liquid delivery end of the output pump 32 and one end of the condensing square tube 30 are fixedly connected via two first sealing flanges. The liquid delivery end of the refrigeration pump 33 is communicated with the other side of the refrigeration water tank 31, the liquid extraction end of the reflux pump 33 is communicated with the other end of the condensing square tube 30, and the liquid extraction end of the reflux pump 33 and the other end of the condensing square tube 30 are fixedly connected via two second sealing flanges.

[0054] Through the coordinated cooperation of the refrigeration water tank 31, the output pump 32 and the reflux pump 33, the cooling water in the refrigeration water tank 31 can circulate in the condensing square tube 30, thereby achieving a circulating cooling effect;

[0055] Furthermore, the heat dissipation assembly includes a shaft 34 connected to the condensing square tube 30 via a sealed bearing, an impeller 35 fixedly connected to one end of the shaft 34 and located within the condensing square tube 30, a heat dissipation hole formed on one side of the heat dissipation shell 29, and heat dissipation blades 36 fixedly connected to the other end of the shaft 34 and located within the heat dissipation hole. Under the action of water flow in the condensing square tube 30, the impeller 35 can rotate, thereby causing the heat dissipation blades 36 on the shaft 34 to rotate to dissipate heat. In this way, using water flow as a power source eliminates the need for an external drive source to drive all the heat dissipation components on the heat dissipation shell 29, making it more energy-efficient, economical and practical.

[0056] During the specific implementation of this embodiment, first, the cooling water in the refrigeration water tank 31 is pumped out by the output pump 32 and fed into one end of the condensation square tube 30. At the same time, the reflux pump 33 continuously pumps the cooling water out from the other end of the condensation square tube 30 and feeds it into the refrigeration water tank 31. In this way, the cooling water in the refrigeration water tank 31 circulates in the condensation square tube 30 to cool all the fixed mold cores 23, thereby achieving a circulating cooling effect.

[0057] Secondly, under the action of the water flow in the condensing square tube 30, the impeller 35 can rotate, prompting the heat dissipation fan blades 36 on the shaft 34 to rotate for heat dissipation. In this way, through the operation of all the heat dissipation components, the heat emitted by the fixed mold core 23 during the cooling process can be further quickly dissipated to the outside world, thereby effectively improving the cooling efficiency of the fixed mold core 23 and helping to improve the molding efficiency of plastic pipe fittings.

[0058] Example 3, reference Figure 1-2 and Figure 12 This embodiment is optimized on the basis of embodiment 1, specifically: a cylinder wall cleaning mechanism is provided on the support frame 2, and the cylinder wall cleaning mechanism includes a motor support plate welded to the side wall of the support frame 2, a servo motor 37 fixedly mounted on the top outer wall of the motor support plate, a screw 38 rotatably mounted on the support frame 2, a reciprocating slide 39 threadedly connected to the screw 38, a cleaning ring 40 fixedly connected to the top outer wall of the reciprocating slide 39, and a guide horizontal shaft 42 welded to the support frame 2;

[0059] Furthermore, the output shaft of the servo motor 37 is coaxially fixedly connected to one end of the lead screw 38 through a coupling. A guide hole is provided on the reciprocating slide 39 and is slidably connected to the guide horizontal shaft 42. The cleaning ring 40 is coaxially arranged with the heating barrel 3. The inner wall of the cleaning ring 40 is provided with bristles 41 distributed in an annular manner and in contact with the outer wall of the heating barrel 3.

[0060] During the specific implementation of this embodiment: the lead screw 38 is driven to rotate by the servo motor 37, and then under the guidance of the guide horizontal shaft 42, the reciprocating slide 39 threadedly connected to the lead screw 38 drives the cleaning ring 40 to reciprocate in the horizontal direction. In this way, the bristles 41 evenly distributed on the inner wall of the cleaning ring 40 reciprocate on the barrel wall of the heating barrel 3, which can automatically and effectively clean the dust and other impurities attached to its surface, thereby helping to improve the heat conduction efficiency of the heating barrel 3 and ensure that the plastic material can be fully and evenly heated inside.

[0061] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A plastic injection molding device for pipe fitting production, comprising a base (1), a support frame (2) welded to the top outer wall of the base (1), a plastic injection machine and a plastic pipe fitting molding machine, characterized in that: The plastic pipe forming machine includes a forming die and a high-efficiency cooling mechanism; The plastic injection machine comprises a heating barrel (3) welded to the top outer wall of the support frame (2), an injection head (4) fixedly connected to one side of the heating barrel (3), a feed bin (5) fixedly connected to the heating barrel (3) via a feed pipe, a plastic crushing mechanism provided on the feed bin (5), and an electric screw mechanism provided on the heating barrel (3); The electric screw mechanism comprises a positioning plate (7) fixedly connected to the other side of the heating barrel (3), an extrusion screw (6) rotatably mounted on the positioning plate (7) and located in the heating barrel (3), a protective cover (8) fixedly connected to the side wall of the positioning plate (7), a driving motor (9) fixedly mounted on the top outer wall of the protective cover (8), a driving bevel gear (10) fixedly mounted on the output shaft of the driving motor (9), and a driven bevel gear (11) fixedly mounted on one end of the extrusion screw (6); The plastic pulverizing mechanism comprises two pulverizing assemblies and a driving assembly, wherein the two pulverizing assemblies each comprise a pulverizing shaft (14) rotatably mounted in a feed bin (5) and two pulverizing rollers (15) fixedly mounted on the pulverizing shaft (14), and the driving assembly comprises a mounting rod (16) fixedly connected to the top outer wall of the feed bin (5), a pulverizing motor (17) fixedly mounted on the top outer wall of the mounting rod (16), a transmission shaft (18) fixedly connected to the output shaft of the pulverizing motor (17) coaxially through a coupling, a worm (19) fixedly mounted on the upper part of the transmission shaft (18), and a worm gear (20) fixedly mounted in sequence on the middle areas of the two pulverizing shafts (14); The molding die comprises a fixed die seat (22) and a bearing plate (24) fixedly connected to the top outer wall of the base (1) in sequence, a plurality of fixed die cores (23) fixedly mounted on the fixed die seat (22) and uniformly distributed, a cylinder (25) fixedly mounted on the side wall of the bearing plate (24), a movable die seat (26) fixedly connected to the piston end of the cylinder (25), and a movable die core (27) fixedly mounted on the movable die seat (26) and used in conjunction with the fixed die core (23), and all the fixed die cores (23) and the injection head (4) are fixedly connected to the same injection pipeline (43), and the efficient cooling mechanism comprises a heat dissipation shell (29) fixedly connected to the side wall of the fixed die seat (22), a condensation square tube (30) penetrating and fixed in the heat dissipation shell (29), a plurality of heat dissipation components arranged on the condensation square tube (30) and uniformly distributed, and an output pump (32), a cooling water tank (31) and a reflux pump (33) fixedly connected to the top outer wall of the heat dissipation shell (29) in sequence.

2. A plastic injection molding device for pipe production according to claim 1, characterized in that: The output shaft of the driving motor (9) passes through the top of the protective cover (8), and the driving bevel gear (10) and the driven bevel gear (11) are meshed with each other and are both located inside the protective cover (8).

3. A plastic injection molding device for pipe production according to claim 1, characterized in that: Threaded pins (12) are welded to the outer walls of the four corners of one side of the positioning plate (7), and a connecting plate is welded to one side of the heating barrel (3). Pin holes are opened at the four corners of the connecting plate, and the four threaded pins (12) are respectively plugged into the four pin holes, and butterfly nuts (13) are threadedly connected to the four threaded pins (12).

4. A plastic injection molding device for pipe production according to claim 1, characterized in that: The worm (19) is located between the two worm wheels (20), both worm wheels (20) are meshed with the worm (19), and a spiral conveying blade (21) located in the feed pipe is welded to the lower outer wall of the transmission shaft (18).

5. A plastic injection molding device for pipe production according to claim 1, characterized in that: Four guide shafts (28) are welded between the fixed die seat (22) and the bearing plate (24), and sliding holes are provided at the four corners of the movable die seat (26), and the four sliding holes are respectively slidably connected to the four guide shafts (28).

6. A plastic injection molding device for pipe production according to claim 1, characterized in that: The liquid extraction end of the output pump (32) is connected to one side of the refrigeration water tank (31), the liquid delivery end of the output pump (32) is connected to one end of the condensation square tube (30), and the liquid delivery end of the output pump (32) and one end of the condensation square tube (30) are fixedly connected through two first sealing flanges, the liquid delivery end of the reflux pump (33) is connected to the other side of the refrigeration water tank (31), the liquid extraction end of the reflux pump (33) is connected to the other end of the condensation square tube (30), and the liquid extraction end of the reflux pump (33) and the other end of the condensation square tube (30) are fixedly connected through two second sealing flanges.

7. A plastic injection molding device for pipe production according to claim 1, characterized in that: The heat dissipation assembly includes a shaft (34) connected to the condensing square tube (30) through a sealed bearing, an impeller (35) fixedly connected to one end of the shaft (34) and located in the condensing square tube (30), a heat dissipation hole opened on one side of the heat dissipation shell (29), and a heat dissipation fan blade (36) fixedly connected to the other end of the shaft (34) and located in the heat dissipation hole.

8. A plastic injection molding device for pipe production according to claim 1, characterized in that: The support frame (2) is provided with a cylinder wall cleaning mechanism, and the cylinder wall cleaning mechanism comprises a motor support plate welded to the side wall of the support frame (2), a servo motor (37) fixedly mounted on the top outer wall of the motor support plate, a lead screw (38) rotatably mounted on the support frame (2), a reciprocating slide (39) threadedly connected to the lead screw (38), a cleaning ring (40) fixedly connected to the top outer wall of the reciprocating slide (39), and a guide transverse shaft (42) welded to the support frame (2).

9. A plastic injection molding device for pipe production according to claim 8, characterized in that: The output shaft of the servo motor (37) is coaxially fixedly connected to one end of the lead screw (38) through a coupling, and a guide hole is provided on the reciprocating slide rod (39) for sliding connection with the guide transverse shaft (42). The cleaning ring (40) is coaxially arranged with the heating barrel (3), and the inner wall of the cleaning ring (40) is provided with bristles (41) distributed in an annular manner and in contact with the outer wall of the heating barrel (3).

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