Plastic injection molding device for pipe fitting production

Abstract

The invention discloses a plastic injection molding device for pipe fitting production, and relates to the technical field of plastic pipe fitting production, the plastic injection molding device comprises a base, a support frame welded on the outer wall of the top of the base, a plastic injection machine and a plastic pipe fitting forming machine, the plastic pipe fitting forming machine comprises a forming mold and an efficient cooling mechanism, the plastic injection machine comprises a heating machine barrel, an injection head, a feeding bin fixedly communicated with the heating machine barrel through a feeding pipe, a plastic crushing mechanism arranged on the feeding bin and an electric screw mechanism arranged on the heating machine barrel. The plastic crushing mechanism is arranged, the volume of plastic raw materials is reduced by crushing the plastic raw materials, and the pushing effect of spiral conveying blades located in the discharging pipe and rotating is matched, so that the situation of blockage in the feeding process of the plastic raw materials can be effectively avoided, and the feeding efficiency of the plastic raw materials can be improved; and the volume of the plastic raw material is reduced, so that the plastic raw material can move more smoothly in the extrusion screw, 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] Plastic injection molding machine is a kind of equipment used for mass production of plastic products. It heats plastic particles to a molten state and injects them into a closed mold under high pressure. After cooling and solidification, it forms the desired shape. This molding method is applicable to almost all thermoplastics and some thermosetting plastics, and can produce plastic products with complex shapes and precise dimensions.

[0003] However, the 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 the plastic pipes. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a plastic injection molding device for pipe fitting production, which effectively solves the problem that the prior art 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 outer wall of the top of the base, a plastic injection machine and a plastic pipe fitting molding machine, wherein the plastic pipe fitting molding machine comprises a molding mold and a high-efficiency cooling mechanism;

[0007] The plastic injection machine comprises 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 arranged on the feed bin, and an electric screw mechanism arranged 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 driving motor fixedly mounted on the top outer wall of the protective cover, a driving bevel gear fixedly sleeved on the output shaft of the driving 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, wherein the two crushing assemblies each comprise a crushing shaft rotatably mounted in a feed 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 feed bin, a crushing motor fixedly mounted to the top outer wall of the mounting rod, a transmission shaft coaxially fixedly connected to the output shaft of the crushing motor through a coupling, a worm fixedly sleeved on the upper part of the transmission shaft, and a worm gear fixedly sleeved in turn on the middle areas of the two crushing shafts;

[0010] The molding die includes a fixed mold base and a bearing plate which are fixedly connected to the outer wall of the top of the base in sequence, a plurality of fixed mold cores which are fixedly installed on the fixed mold base and are evenly distributed, a cylinder which is fixedly installed on the side wall of the bearing plate, a movable mold base which is fixedly connected to the piston end of the cylinder, and a movable mold core which is fixedly installed on the movable mold base and used in conjunction with the fixed mold core, and all the fixed mold cores are fixedly connected to the injection head via the same injection pipeline.

[0011] Preferably, the output shaft of the driving motor passes through the top of the protective cover, and the driving bevel gear and the driven bevel gear are meshed with each other and are both located inside the protective cover.

[0012] Preferably, threaded pins are welded on the outer walls of the four corners of one side of the positioning plate, and a connecting plate is welded on one side of the heating barrel. Pin holes are opened at the four corners of the connecting plate, and the four threaded pins are respectively plugged into the four pin holes, and butterfly nuts are threadedly connected to the four threaded pins.

[0013] Preferably, the worm is located between two worm wheels, both worm wheels are meshed with the worm, and a spiral conveying blade located in the feed pipe is welded to the lower outer wall of the transmission shaft.

[0014] Preferably, four guide shafts are welded between the fixed mold base and the bearing plate, sliding holes are opened at four corners of the movable mold base, and the four sliding holes are slidably connected to the four guide shafts respectively.

[0015] Preferably, the efficient cooling mechanism includes a heat dissipation shell fixedly connected to the side wall of the fixed mold base, a condensing square tube penetrating and fixed in the heat dissipation shell, a plurality of heat dissipation components arranged on the condensing square tube and evenly distributed, and an output pump, a refrigeration water tank and a reflux pump fixedly connected to the top outer wall of the heat dissipation shell in sequence.

[0016] Preferably, the liquid extraction end of the output pump is connected to one side of the refrigeration water tank, the liquid delivery end of the output pump is connected to one end of the condensation square tube, and the liquid delivery end of the output pump and one end of the condensation square tube are fixedly connected by two first sealing flanges, the liquid delivery end of the refrigeration pump is connected to the other side of the refrigeration water tank, the liquid extraction end of the reflux pump is connected to the other end of the condensation square tube, and the liquid extraction end of the reflux pump and the other end of the condensation square tube are fixedly connected by 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 slidably connected to the guide horizontal axis is provided on the reciprocating slide rod. 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 crushes the plastic raw material to reduce the volume of the plastic raw material and cooperates with the pushing effect of the spiral conveying blade located in the discharge pipe and rotating, which can effectively avoid the blockage in the feeding process of the plastic raw material, which is beneficial to improve 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, thereby improving the extrusion efficiency;

[0022] 2. The present invention cooperates with the positioning plate, the threaded pin and the butterfly nut, and the positioning plate can be removed from the connecting plate by simply unscrewing the four butterfly nuts, so that the extrusion screw can be easily disassembled and cleaned;

[0023] 3. The present invention is provided with an efficient cooling mechanism. Firstly, through the coordinated cooperation of the refrigeration water tank, the output pump and the reflux pump, the cooling water in the refrigeration water tank can circulate in the condensation square tube, so as to achieve the effect of circulating cooling. Secondly, under the action of the water flow in the condensation square tube, the impeller can rotate to cause the heat dissipation fan blades on the shaft body 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 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 the plastic pipe fittings.

[0024] 4. The present invention uses water flow as a power source, so that all 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, which can automatically and effectively clean dust and other impurities attached to the surface of the heating barrel through the reciprocating motion of the bristles evenly distributed on the inner wall of the cleaning ring, 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-sectional structure of the plastic injection machine in the present invention;

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

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

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

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

[0033] Figure 8 It is a three-dimensional enlarged structural schematic diagram of the present invention after the movable mold core is separated from the four guide shafts;

[0034] Fig. 9 It is a three-dimensional exploded structural schematic diagram of the plastic pipe forming machine in the present invention;

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

[0036] Fig.11 It is a side view structural schematic diagram of the plastic molding machine in the present invention;

[0037] Fig.12 It is a three-dimensional enlarged structural schematic diagram 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. drive 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 wheel; 21. spiral conveying blade; 22. Fixed mold base; 23, fixed mold core; 24, bearing plate; 25, cylinder; 26, movable mold base; 27, movable 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 body; 35, impeller; 36, heat dissipation fan blade; 37, servo motor; 38, lead screw; 39, reciprocating slide rod; 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 described clearly and completely 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, 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 molding machine, the plastic pipe molding machine comprising 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 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;

[0043] Furthermore, the output shaft of the driving motor 9 passes through the top of the protective cover 8, the active bevel gear 10 and the driven bevel gear 11 mesh with each other and are both located inside the protective cover 8, threaded pins 12 are welded to the outer walls of the four corners of one side of the positioning plate 7, a connecting plate is welded to one side of the heating barrel 3, and pin holes are opened at the four corners of the connecting plate, and 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;

[0044] When the electric screw mechanism is disassembled, the positioning plate 7 can be removed from the connecting plate by simply unscrewing the four butterfly nuts 13, so that the extrusion screw 6 can be easily disassembled and cleaned;

[0045] Furthermore, the plastic crushing mechanism includes two crushing components and a driving component, the two crushing components each include a crushing shaft 14 rotatably mounted in the feed bin 5 and two crushing rollers 15 fixedly sleeved on the crushing shaft 14, the driving component includes a mounting rod 16 fixedly connected to the top outer wall of the feed bin 5, a crushing motor 17 fixedly mounted on the top outer wall of the mounting rod 16, a transmission shaft 18 coaxially fixedly connected to the output shaft of the crushing motor 17 through a coupling, a worm 19 fixedly sleeved on the upper part of the transmission shaft 18, and a worm wheel 20 fixedly sleeved in the middle area of ​​the two crushing shafts 14 in sequence;

[0046] Furthermore, the worm 19 is located between the two worm wheels 20, and the two worm wheels 20 are meshed with the worm 19. The lower outer wall of the transmission shaft 18 is welded with a spiral conveying blade 21 located in the feed 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 achieved, but also the rotation of the spiral conveying blade 21 on the transmission shaft 18 is achieved, and it is controlled by the same driving device, reducing the number of deployed driving devices;

[0047] In this embodiment, the molding die includes a fixed die seat 22 and a carrier plate 24 which are fixedly connected to the top outer wall of the base 1 in sequence, a plurality of fixed die cores 23 which are fixedly mounted on the fixed die seat 22 and are evenly distributed, a cylinder 25 which is fixedly mounted on the side wall of the carrier plate 24, a movable die seat 26 which is fixedly connected to the piston end of the cylinder 25, and a movable die core 27 which is 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 are fixedly connected to the injection head 4 by a same injection pipeline 43;

[0048] Furthermore, four guide shafts 28 are welded between the fixed mold base 22 and the carrier plate 24, and sliding holes are opened at the four corners of the movable mold base 26. The four sliding holes are slidably connected to the four guide shafts 28 respectively. The stability of the mold closing process of the fixed mold base 22 and the movable mold base 26 can be ensured by the guidance of the four guide shafts 28;

[0049] In 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 wheels 20 meshing with the worm 19 will drive the two crushing shafts 14 to rotate in the opposite direction, and then the two groups of crushing rollers 15 on the two crushing shafts 14 rotate relative to each other to fully crush the plastic raw materials added to the feed bin 5. Then, by crushing the plastic raw materials to reduce the volume of the plastic raw materials and cooperating with the pushing effect of the spiral conveying blade 21 located in the discharge pipe and rotating, the blockage in the feeding process of the plastic raw materials can be effectively avoided, which is beneficial to improving the feeding efficiency of the plastic raw materials, and by reducing the volume of the plastic raw materials, the plastic raw materials can move more smoothly in the extrusion screw 6, thereby improving the extrusion efficiency;

[0050] Secondly, the driving motor 9 controls the active bevel gear 10 to rotate, and then the driven bevel gear 11 meshing with the active bevel gear 10 drives the extrusion screw 6 to rotate, thereby being able to push 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 pipeline 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 on the basis of the embodiment 1, specifically: the efficient cooling mechanism includes a heat dissipation shell 29 fixedly connected to the side wall of the fixed mold base 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 evenly distributed, and an output pump 32, a refrigeration water tank 31 and a reflux pump 33 fixedly connected to the top outer wall of the heat dissipation shell 29 in sequence, the condensation 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 condensation square tube 30;

[0053] Further, 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, the liquid delivery end of the output pump 32 is fixedly connected to one end of the condensation square tube 30 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 is fixedly connected to the other end of the condensation square tube 30 through two second sealing flanges;

[0054] Through the 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 condensation square tube 30, so as to achieve the effect of circulating cooling.

[0055] Furthermore, the heat dissipation component 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. Under the action of the water flow in the condensing square tube 30, the impeller 35 can rotate to cause the heat dissipation fan blade 36 on the shaft 34 to rotate for heat dissipation. In this way, the water flow is used as a power source, so that all the heat dissipation components on the heat dissipation shell 29 do not need to be driven by an additional external driving source, which is more energy-saving, economical and practical.

[0056] In the specific implementation of this embodiment: first, the cooling water in the refrigeration water tank 31 is pumped out through the output pump 32 and sent into one end of the condensation square tube 30, and at the same time, the reflux pump 33 continuously pumps out the cooling water from the other end of the condensation square tube 30 and sends it into the refrigeration water tank 31, so that the cooling water in the refrigeration water tank 31 can circulate in the condensation square tube 30 to cool down all the fixed mold cores 23, so as to achieve the effect of circulating cooling;

[0057] Secondly, under the action of the water flow in the condensing square tube 30, the impeller 35 can rotate to prompt 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, 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 Fig.12 This embodiment is optimized on the basis of the 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 lead screw 38 rotatably mounted on the support frame 2, a reciprocating slide rod 39 threadedly connected to the lead screw 38, a cleaning ring 40 fixedly connected to the top outer wall of the reciprocating slide rod 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 slidably connected to the guide horizontal shaft 42 is provided on the reciprocating slide rod 39, 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 which are distributed in an annular manner and contact the outer wall of the heating barrel 3;

[0060] In 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 rod 39 threadedly connected to the lead screw 38 will drive the cleaning ring 40 to reciprocate in the horizontal direction, so that 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 the 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 implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic injection molding device for pipe 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 molding machine, characterized in that: The plastic pipe forming machine comprises 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 a 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 arranged on the feed bin (5), and an electric screw mechanism arranged 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 components and a driving component, wherein the two pulverizing components 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 component 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) coaxially fixedly connected to the output shaft of the pulverizing motor (17) via a coupling, a worm (19) fixedly mounted on the upper part of the transmission shaft (18), and a worm wheel (20) fixedly mounted in sequence on the middle regions of the two pulverizing shafts (14); The molding die comprises a fixed mold base (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 mounted on the fixed mold base (22) and are evenly distributed, a cylinder (25) which is fixedly mounted on the side wall of the bearing plate (24), a movable mold base (26) which is fixedly connected to the piston end of the cylinder (25), and a movable mold core (27) which is fixedly mounted on the movable mold base (26) and is used in conjunction with the fixed mold core (23), and all the fixed mold cores (23) are fixedly connected to the injection head (4) via a same injection pipeline (43).

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 at 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 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), the two 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 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 high-efficiency cooling mechanism comprises a heat dissipation shell (29) fixedly connected to the side wall of the fixed mold base (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 evenly distributed, and an output pump (32), a refrigeration water tank (31) and a reflux pump (33) fixedly connected to the top outer wall of the heat dissipation shell (29) in sequence.

7. A plastic injection molding device for pipe production according to claim 6, 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 via 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 via two second sealing flanges.

8. A plastic injection molding device for pipe production according to claim 6, characterized in that: The heat dissipation component comprises 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 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.

9. 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 rod (39) threadedly connected to the lead screw (38), a cleaning ring (40) fixedly connected to the top outer wall of the reciprocating slide rod (39), and a guide transverse shaft (42) welded to the support frame (2).

10. A plastic injection molding device for pipe production according to claim 9, 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 slidably connected to the guide transverse axis (42) is provided on the reciprocating slide rod (39). 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 shape and in contact with the outer wall of the heating barrel (3).

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