Large injection mold automation structure and manufacturing method thereof

Abstract

The invention belongs to the technical field of injection molds, and particularly relates to a large injection mold automation structure and a manufacturing method thereof.The large injection mold automation structure comprises a movable mold, a fixed mold and a pipe bending mold core rod, and the fixed mold and the movable mold are provided with movable cavity grooves allowing the pipe bending mold core rod to rotate; the movable cavity groove is provided with a forming groove matched with the forming end of the pipe bending mold core rod to form a pipe bending injection molding part. The first core pulling mechanism is arranged at one end of the movable cavity groove and used for driving the pipe bending mold core rod to move, the plug is arranged at the other end of the movable cavity groove and used for plugging the forming groove, and the second core pulling mechanism is used for driving the plug to coaxially and spirally move. A forming boss is coaxially arranged on the end face, close to the pipe bending mold core rod, of the plug and corresponds to an inner cavity of a pipe bending injection part, and a circumferential forming position is arranged on the side wall of the forming boss. The end face of the forming boss is coaxially attached to and abuts against the forming end of the pipe bending mold core rod. The plug and the forming boss are designed, and the first core-pulling mechanism and the second core-pulling mechanism are matched, so that the bent pipe injection part can be automatically formed, and efficient and lossless stripping can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and in particular to an automated structure of a large injection mold and a manufacturing method thereof. Background Art

[0002] Plastic products are widely used in our daily lives. They are made through injection molding or blow molding. Injection molds are tools used to produce plastic products and give them their complete structure and precise dimensions. Injection molding is a processing method used for mass production of complex components. Specifically, molten material is injected into a mold cavity under high pressure, and the resulting molded product is solidified after cooling.

[0003] For injection molded parts such as bent tubes, the molding method currently used in the industry is basically an embedded one-way core-pulling mold. Traditional embedded core-pulling molds usually use a cylinder core-pulling mechanism, which connects the tube bending mold core rod to the movable rod of the cylinder through a hinge to convert the linear motion of the cylinder into the rotational motion of the tube bending mold core rod. When the cylinder is reset, the tube bending mold core rod can be axially moved out of the inner cavity of the injection molded part. However, this structural method is only suitable for some general pipe fittings. For some special products, such as those that need to form threads or circumferential grooves or ribs on the inside of the bent tube, the existing molds cannot achieve non-destructive demolding and blanking. Therefore, it is necessary to design a new automated mold to meet higher production needs. Summary of the Invention

[0004] The object of the present invention is to provide a large injection mold automation structure and a manufacturing method thereof to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: an automated structure for a large-scale injection mold, comprising a movable mold and a fixed mold relative to each other horizontally, and a bending mold core rod longitudinally rotatably connected to the fixed mold, wherein both the fixed mold and the movable mold are provided with a movable cavity groove for longitudinally rotating the bending mold core rod, characterized in that both ends of the movable cavity groove penetrate the lower side wall of the fixed mold, and the middle portion of the movable cavity groove has a molding groove for cooperating with the molding end of the bending mold core rod to form a bent pipe injection molded part; It also includes a first core-pulling mechanism that drives the bending mold core rod to move back and forth at one end of the movable cavity, a plug that seals the forming groove at the other end of the movable cavity, and a second core-pulling mechanism that drives the plug to move coaxially and spirally; a forming boss is coaxially provided on an end face of the plug close to the bending mold core rod corresponding to the inner cavity of the bending injection part, and a circumferential forming position is provided on the side wall of the forming boss; when assembled in place, the end face of the forming boss is coaxially fitted and pressed against the forming end of the bending mold core rod.

[0006] The large injection mold automation structure described in the present invention is characterized in that the diameter of the forming end of the bending mold core rod is the same as the diameter of the forming boss. When assembled in place, the plug and the adjacent end faces of the forming end are coaxially fitted and pressed against each other.

[0007] The large injection mold automation structure described in the present invention is characterized in that a mounting groove is provided on the fixed mold on the centripetal side of the movable cavity, a rotating shaft is provided in the mounting groove coaxially rotating with the movable cavity, the bending tube mold core rod is fixedly connected to the rotating shaft, and the movable terminal of the first core pulling mechanism is connected to the bending tube mold core rod.

[0008] In the large injection mold automation structure of the present invention, a heating element is embedded in the core rod of the bending mold, and the heating element is distributed in a spiral shape along the axial direction of the core rod of the bending mold.

[0009] In the large injection mold automation structure of the present invention, the heating element is a thermocouple, and a connection port connected to the heating element is provided in the rotating shaft.

[0010] The large injection mold automation structure described in the present invention is characterized in that a drive shaft is coaxially provided on the outer end surface of the plug, the drive shaft is rotatably connected to the fixed mold through a bearing assembly, a drive thread is provided on the outer side wall of the drive shaft, and a threaded sleeve adapted to the drive thread is fixedly provided on the fixed mold, and the second core-pulling mechanism is a motor and is connected to the drive shaft through a shaft connection assembly.

[0011] The large injection mold automation structure described in the present invention, wherein the shaft connection assembly includes a connecting shaft coaxially arranged between the drive shaft and the rotating shaft of the second core-pulling mechanism, and the drive shaft extends into the connecting shaft and is axially slidably connected thereto.

[0012] The large injection mold automation structure described in the present invention, wherein the shaft connection assembly also includes a movable outer ring coaxially rotatably connected to the outside of the connecting shaft; a first flow channel is provided in the plug, and two second flow channels connected to the first flow channel at both ends are radially arranged side by side in the drive shaft, and two third flow channels respectively connected to the two second flow channels are provided in the connecting shaft, and a first through hole is provided on the circumferential side wall of the connecting shaft corresponding to the two third flow channels, and an annular conducting groove is circumferentially provided on the inner wall of the movable outer ring corresponding to the first through hole, and a second through hole is radially penetrated through the inner wall of the annular conducting groove.

[0013] In the large injection mold automation structure of the present invention, the first flow channel is spiral and coaxial with the plug.

[0014] In addition, the present invention also provides an injection molding method of a large injection mold automation structure, the injection molding method comprising the following steps: Mold closing: The first core-pulling mechanism drives the forming end of the core rod of the bending tube mold into the forming groove; The second core-pulling mechanism drives the plug to make the forming boss enter the groove and coaxially fit and press against the end surface of the forming end of the bending mold core rod; The movable mold and the fixed mold are closed, and the two molding grooves and the molding end and the molding shape and the plug together enclose a molding cavity for molding the elbow injection part; Mold opening: The second core-pulling mechanism drives the plug so that the molding boss spirally and axially exits the interior of the elbow injection molded part; The first core-pulling mechanism drives the forming end of the core rod of the elbow mold to axially withdraw from the interior of the elbow injection mold; The movable mold is separated from the fixed mold to realize mold opening and material removal.

[0015] Compared with the prior art, the present invention has the following beneficial effects: When the mold is closed and the glue is injected, by designing the molding position on the molding boss and its surrounding side wall, it is possible to form a spiral or circumferential rib or groove structure on the inner wall of the elbow injection part, and cooperate with the second core-pulling mechanism to automatically realize the efficient and non-destructive separation of the molding boss and the elbow injection part. Compared with traditional mold technology, it is not only more efficient, but also the complexity of the workpiece that can be processed is higher, the adaptability is stronger, and it is more conducive to the company's cost control for the production of replacement products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is the overall structural diagram of the present invention.

[0018] Figure 2 It is a structural diagram of the movable mold of the present invention.

[0019] Figure 3 It is a fixed mold structure diagram of the present invention.

[0020] Figure 4 It is a side view of the fixed mold of the present invention.

[0021] Figure 5 for Figure 4 AA cross-sectional view.

[0022] Figure 6 for Figure 5 A magnified view of the local structure.

[0023] Figure 7 for Figure 6 A magnified view of the local structure.

[0024] Figure 8 It is a front view of the fixed mold of the present invention.

[0025] Figure 9 for Figure 8 BB cross-sectional view. DETAILED DESCRIPTION

[0026] The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of the present invention are used to distinguish between different items, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0027] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] "Multiple" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0029] Moreover, the terms "up, down, left, right, upper end, lower end, longitudinal" and the like indicating directions are all based on the posture and position of the device or apparatus described in this solution during normal use.

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the following will be a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work shall fall within the scope of protection of the present invention.

[0031] This embodiment discloses Figures 1 to 9 The large-scale injection mold automation structure shown includes a movable mold 10 and a fixed mold 20 that are horizontally opposite to each other, and a bending tube mold core rod 30 that is longitudinally rotatably connected to the fixed mold 20. Both the fixed mold 20 and the movable mold 10 are provided with a movable cavity 40 for the longitudinal rotation of the bending tube mold core rod 30. Specifically, the movable cavity 40 is annular and is arranged on the injection surface of the mold core 21 arranged on the fixed mold 20; both ends of the movable cavity 40 pass through the lower side wall of the fixed mold 20 for easy installation and driving; further, the middle part of the movable cavity 40 has a molding groove 41 for cooperating with the molding end of the bending tube mold core rod 30 to form a bending tube injection molded part 500. When the bending tube mold core rod 30 moves into position under the injection state, the sealing end with a larger diameter of the bending tube mold core rod 30 seals one end of the molding groove 41. At this time, a molding gap for accommodating the molten glue is formed between the outer wall of the molding end of the bending tube mold core rod 30 and the inner wall of the molding groove 41.

[0032] Furthermore, the large injection mold automation structure of this embodiment also includes a first core pulling mechanism 50 that drives the bending tube mold core rod 30 to move back and forth at one end of the movable cavity 40, and a plug 60 that seals the molding groove 41 at the other end of the movable cavity 40, and a second core pulling mechanism 70 that drives the plug 60 to move coaxially spirally; half of the first core pulling mechanism 50 adopts a linear mechanism such as an oil cylinder or an air cylinder or a screw module. As a preference, this embodiment specifically adopts an oil cylinder and its movable rod extends into the movable cavity 40 and is horizontally hinged to the bending tube mold core rod 30 through a hinge 80; wherein, the cylinder body 51 of the oil cylinder is arranged in the position corresponding to the movable cavity 40 of the fixed mold 20 to avoid mold interference during mold closing.

[0033] Furthermore, a molding boss 601 is coaxially provided on one end face of the plug 60 close to the bending mold core rod 30, corresponding to the inner cavity of the bending injection molded part 500, and a circumferential molding position 62 is provided on the side wall of the molding boss 601. The molding position 62 is any one of an external thread, a circumferential long groove and a long protrusion, which is specifically embodied by a thread in this embodiment; when assembled in place, the end face of the molding boss 601 is coaxially fitted and pressed against the molding end of the bending mold core rod 30; when the mold is closed and the glue is injected, by designing the molding boss 601 and the molding position 62 on its circumferential side wall, a spiral or circumferential rib or groove structure can be formed on the inner wall of the bending injection molded part, and in conjunction with the second core pulling mechanism 70, the molding boss 601 can be automatically separated from the bending injection molded part in an efficient and non-destructive manner. Compared with traditional mold technology, it is not only more efficient, but also the complexity of the workpiece that can be processed is higher, the adaptability is stronger, and it is more conducive to the company's cost control for the production of replacement products.

[0034] In this embodiment, the diameter of the forming end of the bending tube mold core rod 30 is the same as the diameter of the forming boss 601. When assembled in place, the plug 60 and the adjacent end faces of the forming end are coaxially fitted and pressed against each other to ensure that the inner wall of the bent tube injection molding is smoother and flatter.

[0035] In this embodiment, a mounting groove 42 is provided on the fixed mold 20 on the centripetal side of the movable cavity 40, and a rotating shaft 90 is provided in the mounting groove 42 to rotate coaxially with the movable cavity 40. The bending tube mold core rod 30 is fixedly connected to the rotating shaft 90, and the movable terminal 52 of the first core-pulling mechanism 50 is connected to the upper bending tube mold core rod 30; further, guide grooves 43 are provided on the outer arc side wall and the inner arc side wall of the movable cavity 40, and a reciprocating movable seat 100 is provided in the movable cavity 40, and guide ribs 101 adapted to the guide grooves 43 are provided at both ends of the movable seat 100. The fixed end of the bending tube mold core rod 30 is fixed on the movable seat 100 and achieves smooth sliding in the movable cavity 40 through the cooperation of the guide groove 43 and the guide rib 101.

[0036] In addition, in order to ensure the sealing between the bending tube mold core rod 30 and the molding cavity after the mold is closed, the fixed end of the bending tube mold core rod 30 is higher than the movable cavity groove 40 at one end facing the movable mold 10, and has a first inclined surface 110 at the end of the fixed end away from the molding groove 41, and a positioning groove 120 corresponding to the fixed end of the bending tube mold core rod 30 is provided on the mold core of the movable mold 10, and a second inclined surface 130 is provided on the inner wall of the positioning groove 120. When the mold is closed, the second inclined surface 130 is pressed against the first inclined surface 110 and the fixed end of the bending tube mold core rod 30 is pressed against the fixed end to ensure the sealing of the molding cavity and avoid glue leakage during glue injection; similarly, the same pressing structure principle is also adopted on the plug 60, thereby ensuring the sealing of both ends of the molding cavity and reducing the water outlet generation rate at both ends of the bent tube injection.

[0037] In this embodiment, a heating element 140 is embedded in the core rod 30 of the bending tube mold, and the heating element 140 is spirally distributed along the axial direction of the core rod 30 of the bending tube mold, so as to achieve high-precision control of the core temperature of the core rod 30 of the bending tube mold, thereby further improving the injection molding quality of the bending tube injection molded part (the core rod 30 of the bending tube mold needs to be movable relative to the fixed mold 20, which also makes it impossible to control the temperature inside it in the prior art, and further causes shrinkage wrinkles and uneven internal stress on the inner wall of the injection molded part - this problem is a major disadvantage of the core-pulling injection mold); wherein, the heating element 140 is specifically a thermocouple, and in order to ensure the normal power supply of the thermocouple, a connection port connected to the heating element 140 is provided in the rotating shaft 90, and the connection port is realized by a coaxial channel 91 in the rotating shaft 90 and an opening 92 on its inner wall. Correspondingly, a wiring groove 102 for arranging wires is also provided in the movable seat 100, so as to facilitate the rotating shaft 90 to pass through the fixed mold 20 and its mold core and introduce the wires from the back of the fixed mold 20.

[0038] Furthermore, in order to ensure the stability of the rotating shaft 90, a fixing seat 150 for fixing the end of the rotating shaft 90 is provided in the mounting groove 42. The fixing seat 150 and the mold core 21 of the fixed mold 20 are fixed together by bolts, and the wire enters the bending mold core rod 30 from the opening 92 on the side wall of the rotating shaft 90 and the channel in the fixing seat 150 and is connected to the thermocouple. This design can realize the fully hidden layout of the wire.

[0039] In this embodiment, a drive shaft 61 is coaxially and integrally provided on the outer end surface of the plug 60, and the drive shaft 61 is rotatably connected to the fixed mold 20 through a bearing assembly 160. Specifically, two bearing assemblies 160 are provided and axially arranged side by side. The bearing assembly 160 includes a bearing body 161 coaxially fixed on the drive shaft 61, and a bearing seat 162 for fixing the bearing body 161 on the mold core of the fixed mold 20; further, a drive thread 610 is provided on the outer wall of the drive shaft 61, and the drive thread 610 is located between the two bearing assemblies 160. A threaded sleeve 190 adapted to the drive thread 610 is fixed on the fixed mold 20. The second core-pulling mechanism 70 is a motor and is connected to the drive shaft 61 through a shaft connection assembly 170. Through the layout design of the two bearing assemblies 160, the coaxiality of the plug 60 and the drive shaft 61 in moving forward and backward can be ensured, so that the sealing accuracy of the plug 60 to the molding cavity is higher.

[0040] In practice, in order to avoid interfering with the closing process of the fixed mold 20 and the movable mold 10, a receiving groove 210 for accommodating the two bearing assemblies 160 and the threaded sleeve 190 is provided on the fixed mold 20 and its mold core 21. Half of the receiving groove 210 is located on the mold core 21 of the fixed mold 20, and the other half is located on the fixed mold 20. The receiving groove 210 is also used for the plug 60 to move forward and backward, so that the plug 60 can be removed from the molding cavity for replacement or maintenance.

[0041] In addition, in order to facilitate the installation or disassembly of the plug 60, a guide rail assembly 180 that can be in the same direction as the drive shaft 61 is provided on the fixed mold 20 corresponding to the end of the movable cavity 40, and the second core-pulling mechanism 70 is provided on the slider of the guide rail assembly 180. However, it should be noted that under normal working conditions, the slider of the guide rail assembly 180 is relatively fixed to the fixed mold 20 by bolts.

[0042] In this embodiment, the shaft connection assembly 170 includes a connecting shaft 171 coaxially arranged between the drive shaft 61 and the rotating shaft 71 of the second core-pulling mechanism 70. The end of the drive shaft 61 extends into the connecting shaft 171 and is axially slidably connected thereto to provide the necessary travel space for the forward and backward movement of the plug 60, thereby isolating the action and reaction forces of the second core-pulling mechanism 70 and the drive shaft 61 in the axial direction. It should be noted that the cross-section of the end of the drive shaft 61 extending into the connecting shaft 171 is specifically elliptical, so as to facilitate the transmission of torque while also facilitating the setting of a sealing ring in the connecting shaft 171.

[0043] In this embodiment, the shaft connection assembly 170 also includes a movable outer ring 172 that is coaxially rotatably connected to the outside of the connecting shaft 171; a first flow channel 63 is provided in the plug 60, and two second flow channels 611 that are connected to the two ends of the first flow channel 63 are radially arranged side by side in the driving shaft 61, and two third flow channels 1710 that are respectively connected to the two second flow channels 611 are provided in the connecting shaft 171. A first through hole 1711 is provided on the peripheral side wall of the connecting shaft 171 corresponding to the two third flow channels 1710, and a first through hole 1711 is provided on the inner wall of the movable outer ring 172 corresponding to the first through hole 1711. An annular conducting groove 1721 is provided, and a second through hole 1722 is radially penetrated on the inner wall of the annular conducting groove 1721. By installing a nozzle in the two second through holes 1722, heat transfer oil can be circulated in the drive shaft 61 and the plug 60, so as to quickly cool down the part of the elbow injection corresponding to the molding boss 601 before opening the mold, so as to ensure that the plug 60 will not adhere to the molding position 62 during the process of rotating to exit the elbow injection, resulting in demolding failure or the torque generated in the process will cause damage to the injection part, thereby significantly improving the yield rate of demolding.

[0044] Furthermore, in order to ensure the independence of the two second flow channels 611 inside the driving shaft during the axial relative movement with the connecting shaft, an extension tube portion 612 is provided on the end face of the driving shaft 61 extending into the connecting shaft corresponding to the two second flow channels. Correspondingly, an avoidance groove 1712 adapted to the extension tube portion 612 is provided on the bottom surface of the inner cavity 1713 of the connecting shaft for the driving shaft to be inserted.

[0045] In addition, the hollow design of the drive shaft 61 also facilitates heat treatment and strengthening of its inner and outer side walls to improve the bending resistance of the drive shaft 61 and ensure the sealing accuracy of the plug 60.

[0046] In this embodiment, the first flow channel 63 is spiral and coaxial with the plug 60 to prolong the contact time between the heat exchange fluid and the plug 60 and accelerate the heat exchange speed.

[0047] In addition, this embodiment also provides an injection molding method for a large injection mold automation structure, the injection molding method comprising the following steps: Mold closing: The first core-pulling mechanism 50 drives the forming end of the tube bending mold core rod 30 into the forming groove 41; Second, the core pulling mechanism drives the plug 60 to make the forming boss 601 enter the groove and coaxially fit with the end face of the forming end of the tube bending mold core rod 30; The movable mold 10 and the fixed mold 20 are closed, and the two molding grooves 41 and the molding end and the molding shape and the plug 60 together enclose a molding cavity for molding the elbow injection part; Mold opening: The second core-pulling mechanism 70 drives the plug 60 so that the forming boss 601 spirally withdraws from the interior of the elbow injection molded part; The first core-pulling mechanism 50 drives the forming end of the tube bending mold core rod 30 to axially withdraw from the interior of the tube bending injection molding; The movable mold 10 is separated from the fixed mold 20 to realize mold opening and material removal.

[0048] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A large-scale injection mold automation structure, comprising a movable mold and a fixed mold relative to each other horizontally, and a bending mold core rod connected to the fixed mold for longitudinal rotation, wherein both the fixed mold and the movable mold are provided with a movable cavity groove for longitudinal rotation of the bending mold core rod, characterized in that: Both ends of the movable cavity groove pass through the lower side wall of the fixed mold, and the middle part of the movable cavity groove has a molding groove that cooperates with the molding end of the bending mold core rod to form a bent pipe injection molded part; It also includes a first core-pulling mechanism that drives the bending mold core rod to move back and forth at one end of the movable cavity, a plug that seals the forming groove at the other end of the movable cavity, and a second core-pulling mechanism that drives the plug to move coaxially and spirally; a forming boss is coaxially provided on an end face of the plug close to the bending mold core rod corresponding to the inner cavity of the bending injection part, and a circumferential forming position is provided on the side wall of the forming boss; when assembled in place, the end face of the forming boss is coaxially fitted and pressed against the forming end of the bending mold core rod.

2. The large injection mold automation structure according to claim 1, characterized in that: The diameter of the forming end of the bending tube mold core rod is the same as the diameter of the forming boss. When assembled in place, the plug and the adjacent end faces of the forming end are coaxially fitted and pressed against each other.

3. The large injection mold automation structure according to claim 1, characterized in that: The fixed mold is provided with an installation groove on the centripetal side of the movable cavity groove, and a rotating shaft is provided in the installation groove to rotate coaxially with the movable cavity groove. The bending tube mold core rod is fixedly connected to the rotating shaft, and the movable terminal of the first core pulling mechanism is connected to the bending tube mold core rod.

4. The large injection mold automation structure according to claim 3, characterized in that: A heating element is embedded in the core rod of the pipe bending mold, and the heating element is distributed in a spiral shape along the axial direction of the core rod of the pipe bending mold.

5. The large injection mold automation structure according to claim 4, characterized in that: The heating element is a thermocouple, and a connection port connected to the heating element is provided in the rotating shaft.

6. The large injection mold automation structure according to claim 1, characterized in that: A drive shaft is coaxially provided on the outer end surface of the plug, and the drive shaft is rotatably connected to the fixed mold through a bearing assembly. A drive thread is provided on the outer side wall of the drive shaft, and a threaded sleeve adapted to the drive thread is fixedly provided on the fixed mold. The second core-pulling mechanism is a motor and is connected to the drive shaft through a shaft connection assembly.

7. The large injection mold automation structure according to claim 6, characterized in that: The shaft connection assembly includes a connecting shaft coaxially arranged between the driving shaft and the rotating shaft of the second core-pulling mechanism. The driving shaft extends into the connecting shaft and is axially slidably connected thereto.

8. The large injection mold automation structure according to claim 7, characterized in that: The shaft connection assembly also includes a movable outer ring coaxially rotatably connected to the outside of the connecting shaft; a first flow channel is provided in the plug, two second flow channels connected to the two ends of the first flow channel are radially arranged side by side in the drive shaft, and two third flow channels respectively connected to the two second flow channels are provided in the connecting shaft, a first through hole is provided on the circumferential side wall of the connecting shaft corresponding to the two third flow channels, an annular conducting groove is circumferentially provided on the inner wall of the movable outer ring corresponding to the first through hole, and a second through hole is radially penetrated on the inner wall of the annular conducting groove.

9. The large injection mold automation structure according to claim 7, characterized in that: The first flow channel is spiral and coaxial with the plug.

10. An injection molding method for a large injection mold automation structure, according to any one of claims 1 to 9, characterized in that: The injection molding method includes the following steps: Mold closing: The first core-pulling mechanism drives the forming end of the core rod of the bending tube mold into the forming groove; The second core-pulling mechanism drives the plug to make the forming boss enter the groove and coaxially fit and press against the end surface of the forming end of the bending mold core rod; The movable mold and the fixed mold are closed, and the two molding grooves and the molding end and the molding shape and the plug together enclose a molding cavity for molding the elbow injection part; Mold opening: The second core-pulling mechanism drives the plug so that the molding boss spirally and axially exits the interior of the elbow injection molded part; The first core-pulling mechanism drives the forming end of the core rod of the elbow mold to axially withdraw from the interior of the elbow injection mold; The movable mold is separated from the fixed mold to realize mold opening and material removal.

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