Injection molding mold for a plastic elbow

Abstract

This invention relates to the field of injection mold technology, specifically to an injection molding mold for plastic bent pipes. The mold includes a moving module and a fixed module arranged front to rear and cooperating with each other, and a moving mold core and a fixed mold core respectively embedded inside the rear side of the moving module and the front side of the fixed module and cooperating with each other. It also includes a linked core-pulling assembly, which includes a traction slider slidably connected in the vertical direction to the front side of the fixed module and located below the fixed mold core, a core-pulling cylinder fixed to the lower outer wall of the fixed module, a fan-shaped slider slidably connected in the circumferential direction to the end face of the fixed mold core and located below the opening at the end of the arc-shaped semi-circular bottom groove, and a traction arm disposed between the fan-shaped slider and the traction slider. This invention reduces manufacturing costs and the complexity of processing, installation, and debugging, while ensuring smooth demolding of the plastic bent pipe.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and more specifically, to an injection molding mold for a plastic bent pipe. Background Technology

[0002] Plastic bends are pipe fittings or curved pipe sections made of plastic material used to change the direction of pipes. Most plastic bends consist of straight sections and curved sections. A single straight mandrel can only complete the internal forming and core pulling of the straight section. To complete the internal forming and core pulling of the curved section, a rotatable arc-shaped mandrel must be set in the curved section. In addition, the outer walls of the curved section and the outer walls of the straight section are not completely smooth, and holes and baffles must be set according to design requirements.

[0003] In order to form the aforementioned holes and baffles in one go, the existing injection molds for plastic bends must have at least one set of active core-pulling mechanisms for each hole and baffle. Since the active core-pulling mechanism must be equipped with a hydraulic cylinder and an air circuit, the manufacturing cost is high and the complexity of the processing, installation and debugging process is increased. Moreover, interference can easily occur between the active core-pulling mechanisms, which will affect the smooth demolding of the plastic bend. This problem urgently needs to be solved. Summary of the Invention

[0004] In view of the current state of the prior art, the technical problem to be solved by the present invention is to provide an injection molding mold for plastic bends that reduces manufacturing costs, simplifies the processing, installation and debugging process, and ensures smooth demolding of plastic bends.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an injection molding mold for plastic bent pipe, including a moving module and a fixed module that are respectively arranged in front and behind and cooperate with each other, and a moving mold core and a fixed mold core that are respectively embedded in the rear side of the moving module and the front side of the fixed module and cooperate with each other. A straight semi-circular bottom horizontal groove is provided on the end face of the moving mold core and the fixed mold core, and a symmetrically distributed straight semi-circular bottom horizontal groove is formed at the right end opening of each straight semi-circular bottom horizontal groove to the lower left. It also includes a linkage core-pulling assembly, which includes a traction slider that is slidably connected to the front side of the fixed module and located below the fixed mold core in the vertical direction, a core-pulling cylinder fixed to the lower outer wall of the fixed module, a fan-shaped slider that is slidably connected to the end face of the fixed mold core in the circumferential direction and located below the opening of the arc-shaped semi-circular bottom groove, and a traction arm disposed between the fan-shaped slider and the traction slider. The telescopic end of the core-pulling cylinder is vertically upward and fixed to the traction slider. The lower end of the traction arm is rotatably connected to the traction slider, and the upper end of the traction arm is slidably and rotatably connected to the fan-shaped slider. The linkage core-pulling assembly also includes a core-pulling column that is radially slidably connected to the end face of the fixed mold core along the rotation center line of the fan-shaped slider and located on the upper right side of the arc-shaped semi-circular bottom groove, and a core-pulling screw that is concentrically inserted and screwed into the upper end of the core-pulling column. The lower end of the core-pulling column can extend movably into the interior of the arc-shaped semi-circular bottom groove. An arc-shaped transmission bar is formed on the upper outer wall of the fan-shaped slider, facing left, and is concentrically arranged with the rotation center line of the fan-shaped slider. It is movably inserted into the fixed mold core and connected to the core-pulling screw to drive its rotation.

[0006] Preferably, a first arc-shaped tooth surface is formed on the front outer wall near the root of the arc-shaped transmission bar. The linkage core-pulling assembly further includes a first linkage gear that is rotatably connected to the end face of the fixed mold core and concentrically sleeved and fixed outside the core-pulling screw and located on the upper right side of the core-pulling column. The front half of the first linkage gear cooperates with the rear outer wall of the moving mold core, and the rear half of the first linkage gear is rotatably embedded in the front interior of the fixed mold core and meshes with the first arc-shaped tooth surface.

[0007] Preferably, the linkage core-pulling assembly further includes a limiting block that is slidably connected in the vertical direction inside the end face of the fixed mold core and located above the straight semi-circular bottom horizontal groove; a straight rack that is vertically fixed on the rear outer wall of the limiting block and offset from the arc-shaped transmission bar; and a second linkage gear that is horizontally and rotatably connected in the vertical direction inside the end face of the fixed mold core and located above or below the arc-shaped transmission bar. The upper or lower outer wall of the arc-shaped transmission bar near its end is formed with a second arc-shaped tooth surface that meshes with the second linkage gear. The straight tooth surface of the straight rack is arranged in the direction of the second linkage gear and meshes with the second linkage gear.

[0008] Preferably, a base block is formed on the upper outer wall of the traction slider, which is movably inserted into the end face of the fixed mold core. A first clamping block is formed on the upper outer wall of the base block and the lower outer wall of the limiting block, both of which are vertically arranged and symmetrically distributed in the direction of the straight semi-circular bottom groove. The ends of the two first clamping blocks can be movably inserted into the interior of each straight semi-circular bottom groove.

[0009] Preferably, each of the first clamping blocks is further fixed on the right outer wall of a vertically arranged and symmetrically distributed second clamping block that can be movably inserted into the interior of each straight semi-circular bottom groove. The opposite outer walls of the first clamping block and the second clamping block are provided with symmetrically distributed baffle notches. The middle of the outer wall of the first clamping block and the second clamping block facing the straight semi-circular bottom groove is provided with a symmetrically distributed arc-shaped groove.

[0010] Preferably, a forming notch is provided on the left edge of the end face of the fixed mold core, and a vertically arranged sealing plate is also inserted into the fixed mold core. The front part of the sealing plate extends into the interior of the forming notch, and the right outer wall of the sealing plate is attached to the inner wall of the forming notch facing the sealing plate. A rectangular opening groove is provided on the front part of the sealing plate, and a concave arc surface is formed on both the upper and lower edges of the opening of the rectangular opening groove.

[0011] Preferably, the linkage core-pulling assembly further includes a correction block fixed on the front outer wall of the fixed module and located to the right of the fan-shaped slider. A pressure plate is formed outward on the left outer wall of the correction block. A guide arc surface is formed on the outer wall of the pressure plate facing the fan-shaped slider, which cooperates with the outer arc-shaped outer wall of the fan-shaped slider. Concentrically distributed arc-shaped notches are formed on the guide arc surface. An arc-shaped protrusion is also formed outward on the outer arc-shaped outer wall of the fan-shaped slider, which cooperates with the arc-shaped notches. The arc-shaped protrusion is rotatably embedded in the arc-shaped notches.

[0012] Preferably, it further includes an inner core forming assembly, which includes a forming slider that is slidably connected to the front side of the fixed module and located to the left of the fixed mold core in a left-right direction, and a forming cylinder fixed to the left outer wall of the fixed module. The telescopic end of the forming cylinder is arranged laterally to the right and fixed on the forming slider. A first base that cooperates with the forming notch is formed on the right outer wall of the forming slider. A straight inner core column that is arranged laterally and cooperates with both straight semi-circular bottom horizontal grooves is formed on the end face of the first base.

[0013] Preferably, a stop is formed on the front outer wall of the fan-shaped slider, and a second base is formed on the upper outer wall of the stop in the direction of the opening at the end of the arc-shaped semi-circular bottom groove. An arc-shaped inner core column is formed on the end face of the second base in the direction of the opening at the end of the arc-shaped semi-circular bottom groove, and the end of the arc-shaped inner core column cooperates with the end of the straight inner core column.

[0014] Preferably, a symmetrically arranged guide notch is formed at the lower right corner of the rear outer wall of the moving mold core and the front outer wall of the fixed mold core. The fan-shaped slider is rotatably disposed in one of the guide notches on the fixed mold core. A limiting arc surface is formed at the inner corner of the guide notch, which cooperates with the inner arc-shaped outer wall of the fan-shaped slider. The front outer wall of the stop block slides against the bottom surface of one of the guide notches of the moving mold core.

[0015] Compared with the prior art, the advantages of the present invention are as follows: This invention can form the bent section of the plastic tube, the hole on the outer wall of the bent section, and the baffle on the outer wall of the straight section in one step using only the core-pulling cylinder in the linkage core-pulling assembly. There is no need to set up a separate active core-pulling mechanism for the above structures. Therefore, it reduces the manufacturing cost and the complexity of the processing, installation and debugging process, while ensuring the smooth demolding of the plastic tube. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings: Figure 1 This is an exploded structural diagram of the right front side of the present invention; Figure 2 This is an exploded structural diagram of the right front side of the linkage core-pulling assembly and inner core forming assembly of the present invention. Figure 3 This is an exploded structural diagram of the right front side of the linkage core-pulling assembly and the fan-shaped slider of the present invention. Figure 4 This is an exploded structural diagram of the left front side of the corrective block, sealing plate, and fixed mold core of the present invention; Figure 5 This is a structural diagram of the right front side of the mold core of the present invention. Detailed Implementation

[0017] The embodiments of this application will now be described in more detail with reference to the accompanying drawings. Although some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0018] It should be understood that the various steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown, and the scope of this application is not limited in this respect.

[0019] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the relevant definitions of other terms will be given in the description below.

[0020] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] like Figures 1 to 5 As shown, an injection molding mold for a plastic bent pipe includes a moving module 1 and a fixed module 2 that are respectively arranged in front of and behind and cooperate with each other, and a moving mold core 3 and a fixed mold core 4 that are respectively embedded in the rear side of the moving module 1 and the front side of the fixed module 2 and cooperate with each other. A straight semi-circular bottom transverse groove 8 is provided on the end face of the moving mold core 3 and the fixed mold core 4. A symmetrically arranged arc-shaped semi-circular bottom groove 9 is formed at the right end opening of each straight semi-circular bottom transverse groove 8 towards the lower left. It also includes a linkage core-pulling assembly 5, which includes a traction slider 52 that is slidably connected in the vertical direction to the front side of the fixed module 2 and located below the fixed mold core 4, a core-pulling cylinder 51 fixed on the lower outer wall of the fixed module 2, a fan-shaped slider 54 that is slidably connected in the circumferential direction to the end face of the fixed mold core 4 and located below the end opening of the arc-shaped semi-circular bottom groove 9, and a traction arm 53 disposed between the fan-shaped slider 54 and the traction slider 52. The telescopic end of the core-pulling cylinder 51 is vertically upward and fixed on the traction slider 52. The lower end of the traction arm 53 is rotatably connected to the traction slider 52, and the upper end of the traction arm 53 is slidably and rotatably connected to the fan-shaped slider 54. The linkage core-pulling assembly 5 also includes a core-pulling post 515 that is radially slidably connected to the end face of the fixed mold core 4 along the rotation center line of the fan-shaped slider 54 and located on the upper right side of the arc-shaped semi-circular bottom groove 9, and a core-pulling screw 56 that is concentrically inserted and screwed into the upper end of the core-pulling post 515. The lower end of the core-pulling post 515 can extend movably into the interior of the arc-shaped semi-circular bottom groove 9. An arc-shaped transmission bar 541 is formed on the upper outer wall of the fan-shaped slider 54, which is concentric with the rotation center line of the fan-shaped slider 54, movably inserted into the fixed mold core 4, and connected to the core-pulling screw 56 to drive its rotation.

[0023] A first arc-shaped tooth surface 542 is formed on the front outer wall near the root of the arc-shaped transmission bar 541. The linkage core-pulling assembly 5 also includes a first linkage gear 55 that is rotatably connected to the end face of the fixed mold core 4 and concentrically sleeved and fixed outside the core-pulling screw 56 and located to the right and above the core-pulling column 515. The front half of the first linkage gear 55 cooperates with the rear outer wall of the moving mold core 3, and the rear half of the first linkage gear 55 is rotatably embedded into the front interior of the fixed mold core 4 and meshes with the first arc-shaped tooth surface 542.

[0024] The linkage core-pulling assembly 5 also includes a limiting block 57 that is slidably connected in the vertical direction inside the end face of the fixed mold core 4 and located above the straight semi-circular bottom transverse groove 8, a straight rack 58 that is vertically fixed on the rear outer wall of the limiting block 57 and offset from the arc-shaped transmission bar 541, and a second linkage gear 59 that is horizontally and rotatably connected in the vertical direction inside the end face of the fixed mold core 4 and located above or below the arc-shaped transmission bar 541. The upper or lower outer wall of the arc-shaped transmission bar 541 near its end is formed with a second arc-shaped tooth surface 543 that meshes with the second linkage gear 59. The straight tooth surface of the straight rack 58 is set towards the second linkage gear 59 and meshes with the second linkage gear 59.

[0025] A base block 521 is formed on the upper outer wall of the traction slider 52, which is movably inserted into the end face of the fixed mold core 4. A first clamping block 511 is formed on the upper outer wall of the base block 521 and the lower outer wall of the limiting block 57, both facing the direction of the straight semi-circular bottom horizontal groove 8. The ends of the two first clamping blocks 511 can be movably inserted into the interior of each straight semi-circular bottom horizontal groove 8.

[0026] Each first clamping block 511 also has a vertically arranged and symmetrically distributed second clamping block 510 fixed on its right outer wall, which can be movably inserted into each straight semi-circular bottom transverse groove 8. Each first clamping block 511 and the second clamping block 510 has a symmetrically distributed baffle notch 512 on their opposite outer walls. Each first clamping block 511 and the second clamping block 510 has a symmetrically distributed arc-shaped groove 513 in the middle of the outer wall facing the straight semi-circular bottom transverse groove 8.

[0027] A guide slider 571 is formed on the upper outer wall of the limiting block 57. The guide slider 571 is slidably connected to the front interior of the fixed module 2 and located above the fixed mold core 4 in the vertical direction.

[0028] A forming notch 41 is provided on the left edge of the end face of the fixed mold core 4. A vertically arranged sealing plate 7 is also inserted into the fixed mold core 2. The front part of the sealing plate 7 extends into the interior of the forming notch 41. The right outer wall of the sealing plate 7 is attached to the inner wall of the forming notch 41 facing the sealing plate 7. A rectangular opening groove 71 is provided on the front part of the sealing plate 7. A concave arc surface 72 is formed on both the upper and lower edges of the opening of the rectangular opening groove 71.

[0029] The inner wall of the molding notch 41 facing the sealing plate 7 is connected to the left end opening of the straight semi-circular bottom horizontal groove 8. Two groove-shaped notches 42 are symmetrically distributed between the inner wall of the molding notch 41 facing the sealing plate 7 and the left end opening of the straight semi-circular bottom horizontal groove 8.

[0030] The linkage core-pulling assembly 5 also includes a correction block 514 fixed on the front outer wall of the fixed module 2 and located to the right of the fan-shaped slider 54. A pressure plate 5141 is formed outward on the left outer wall of the correction block 514. A guide arc surface 5142 is formed on the outer wall of the pressure plate 5141 facing the fan-shaped slider 54, which cooperates with the outer arc-shaped outer wall of the fan-shaped slider 54.

[0031] The guide arc surface 5142 is provided with concentric arc-shaped notches 5143, and the outer arc-shaped outer wall of the fan-shaped slider 54 is also provided with an arc-shaped protrusion 544 that cooperates with the arc-shaped notches 5143. The arc-shaped protrusion 544 is rotatably embedded in the arc-shaped notches 5143.

[0032] An injection molding mold for a plastic bent pipe further includes an inner core molding component 6. The inner core molding component 6 includes a molding slider 61 that is slidably connected to the front side of the fixed module 2 and located to the left of the fixed mold core 4 in the left-right direction, and a molding cylinder 62 that is fixed to the outer wall of the left side of the fixed module 2. The telescopic end of the molding cylinder 62 is arranged laterally to the right and fixed on the molding slider 61. A first base 611 that cooperates with the molding notch 41 is formed on the outer wall of the right side of the molding slider 61. A straight inner core column 612 that is arranged laterally and cooperates with both straight semi-circular bottom horizontal grooves 8 is formed on the end face of the first base 611.

[0033] A stop 545 is formed on the front outer wall of the fan-shaped slider 54. A second base 546 is formed on the upper outer wall of the stop 545 in the direction of the opening at the end of the arc-shaped semi-circular bottom groove 9. An arc-shaped inner core 547 is formed on the end face of the second base 546 in the direction of the opening at the end of the arc-shaped semi-circular bottom groove 9. The end of the arc-shaped inner core 547 cooperates with the end of the straight inner core 612.

[0034] A guide notch 10 is formed at the lower right corner of the rear outer wall of the moving mold core 3 and the front outer wall of the fixed mold core 4. The fan-shaped slider 54 is rotatably disposed in a guide notch 10 on the fixed mold core 4. A limiting arc surface 48 is formed at the inner corner of the guide notch 10, which cooperates with the inner arc-shaped outer wall of the fan-shaped slider 54. The front outer wall of the stop block 545 slides against the bottom surface of a guide notch 10 of the moving mold core 3.

[0035] The front outer wall of the fixed mold core 4 is provided with a limiting vertical groove 45 located above the straight semi-circular bottom horizontal groove 8 and a recessed cavity 44 located to the right of the arc-shaped semi-circular bottom groove 9. The limiting block 57 is slidably connected in the limiting vertical groove 45 in the vertical direction. The straight rack 58 is located in the limiting vertical groove 45. The rear half of the first linkage gear 55 is rotatably embedded in the recessed cavity 44.

[0036] A rectangular groove 46 is provided at the opening of the recessed cavity 44 facing one side edge of the arc-shaped semi-circular bottom groove 9. A semi-circular bottom limiting groove 47 is provided between the opening of the rectangular groove 46 facing one side edge of the arc-shaped semi-circular bottom groove 9 and the upper side edge of the opening of the arc-shaped semi-circular bottom groove 9. The core-pulling column 515 is movably disposed in the semi-circular bottom limiting groove 47 along the axial direction of the semi-circular bottom limiting groove 47. A rectangular guide block 5151 is formed outward on the outer circumferential surface of the upper end of the core-pulling column 515. The rectangular guide block 5151 is movably disposed in the rectangular groove 46.

[0037] An arc-shaped countersunk hole 43 is provided on the upper inner wall of a guide notch 10 on the fixed mold core 4, which passes through the countersunk cavity 44 and the limiting vertical groove 45. The arc-shaped transmission bar 541 is rotatably inserted into the arc-shaped countersunk hole 43.

[0038] Working principle: A feed plate 11 and a base plate 12 are fixed to the front side of the moving module 1 and the rear side of the fixed module 2, respectively. An ejection mechanism 13 is set between the base plate 12 and the fixed module 2. The feed plate 11 and the moving module 1 are fixed together on the action mechanism of the injection molding machine. The base plate 12, the fixed module 2, and the ejection mechanism 13 are fixed together on the base of the injection molding machine. The action mechanism drives the feed plate 11 and the moving module 1 to move backward until the rear outer wall of the moving module 1 and the front outer wall of the fixed module 2 are in contact with each other. This causes the end face of the moving mold core 3 to be in contact with the end face of the fixed mold core 4, thereby making the two straight semi-circular bottom grooves 8 and the two arc-shaped semi-circular bottom grooves 9 fit together. The above structure and principle are existing technologies.

[0039] Next, the telescopic end of the core-pulling cylinder 51 in the drive linkage core-pulling assembly 5 extends outward to drive the traction slider 52 to move upward, thereby driving the traction arm 53 to move upward as well. Thus, the traction arm 53 drives the fan-shaped slider 54 to rotate to the upper left, thereby causing the arc-shaped transmission bar 541 on the fan-shaped slider 54 to rotate along the arc-shaped countersunk hole 43. In turn, the first arc-shaped tooth surface 542 drives the first linkage gear 55 and the core-pulling screw 56 to rotate, thereby driving the core-pulling column 515 to move radially towards the arc-shaped semi-circular bottom groove 9 along the rotation center line of the fan-shaped slider 54 according to the principle of spiral connection. When the fan-shaped slider 54 rotates, the arc-shaped inner core column 547 on the fan-shaped slider 54 also gradually extends into the interior of the two arc-shaped semi-circular bottom grooves 9. When the fan-shaped slider 54 rotates to the bottom, the lower end of the core-pulling column 515 is inserted into the outer wall of the arc-shaped inner core column 547.

[0040] Meanwhile, during the rotation of the arc-shaped transmission bar 541, it will also drive the second linkage gear 59 to rotate through the second arc-shaped tooth surface 543, and then drive the limiting block 57 to move downward along the limiting vertical groove 45 through the linear rack 58. This will cause a first clamping block 511 and a second clamping block 510 provided on the limiting block 57 to move downward, while a first clamping block 511 and a second clamping block 510 provided on the base block 521 will move upward with the traction slider 52 until the opposite sides of the two first clamping blocks 511 and the opposite sides of the two second clamping blocks 510 are in contact with each other.

[0041] During the above process, the telescopic end of the forming cylinder 62 in the inner core forming assembly 6 is also driven to extend outward to drive the forming slider 61 to move to the right, thereby driving the straight inner core column 612 on the forming slider 61 to gradually extend into the two straight semi-circular bottom horizontal grooves 8 until the end of the straight inner core column 612 and the end of the arc-shaped inner core column 547 are pressed together.

[0042] Next, the injection molding machine feeds the molten material through the gate in the feed plate 11 and the runner in the moving module 1 into the space between the two straight semi-circular bottom grooves 8 and the two arc-shaped semi-circular bottom grooves 9. After cooling, a plastic bend is formed. Then, the telescopic end of the core-pulling cylinder 51 is driven to retract inward to drive the fan-shaped slider 54 to reverse and reset, thereby driving the arc-shaped inner core column 547 to leave the right end of the formed plastic bend. The core-pulling column 515 will also move in the opposite direction to leave the plastic bend and the two arc-shaped semi-circular bottom grooves 9. Each first clamping block 511 and each second clamping block 510 will also move in the opposite direction to reset. At the same time, the telescopic end of the molding cylinder 62 is driven to retract inward to drive the end of the straight inner core column 612 to move to the left until it leaves the left end of the plastic bend. Finally, the action mechanism drives the feed plate 11 and the moving module 1 to move forward, and the ejection mechanism 13 ejects the formed plastic bend forward (existing technology).

[0043] This invention can form the bent section of the plastic tube, the hole on the outer wall of the bent section, and the baffle on the outer wall of the straight section in one go using only the core-pulling cylinder 51 in the linkage core-pulling assembly 5. There is no need to set up an active core-pulling mechanism for each of the above structures. Therefore, it reduces the manufacturing cost and the complexity of the processing, installation and debugging process, while ensuring the smooth demolding of the plastic tube.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding mold for a plastic bent pipe, comprising a moving module and a fixed module respectively arranged front to back and cooperating with each other, and a moving mold core and a fixed mold core respectively embedded inside the rear side of the moving module and the front side of the fixed module and cooperating with each other, wherein each of the moving mold core and the fixed mold core has a symmetrically distributed straight semi-circular bottom transverse groove on its end face, and each straight semi-circular bottom transverse groove has a symmetrically arranged arc-shaped semi-circular bottom groove at the right end opening facing downward to the left, characterized in that: It also includes a linkage core-pulling assembly, which includes a traction slider that is slidably connected to the front side of the fixed module and located below the fixed mold core in the vertical direction, a core-pulling cylinder fixed to the lower outer wall of the fixed module, a fan-shaped slider that is slidably connected to the end face of the fixed mold core in the circumferential direction and located below the opening of the arc-shaped semi-circular bottom groove, and a traction arm disposed between the fan-shaped slider and the traction slider. The telescopic end of the core-pulling cylinder is vertically upward and fixed to the traction slider. The lower end of the traction arm is rotatably connected to the traction slider, and the upper end of the traction arm is slidably and rotatably connected to the fan-shaped slider. The linkage core-pulling assembly also includes a core-pulling column that is radially slidably connected to the end face of the fixed mold core along the rotation center line of the fan-shaped slider and located on the upper right side of the arc-shaped semi-circular bottom groove, and a core-pulling screw that is concentrically inserted and screwed into the upper end of the core-pulling column. The lower end of the core-pulling column can extend movably into the interior of the arc-shaped semi-circular bottom groove. An arc-shaped transmission bar is formed on the upper outer wall of the fan-shaped slider, facing left, and is concentrically arranged with the rotation center line of the fan-shaped slider. It is movably inserted into the fixed mold core and connected to the core-pulling screw to drive its rotation.

2. A plastic elbow injection molding mold according to claim 1, characterized in that, The arc-shaped transmission bar has a first arc-shaped tooth surface formed on the front outer wall near its root. The linkage core-pulling assembly also includes a first linkage gear that is rotatably connected to the end face of the fixed mold core and concentrically sleeved and fixed outside the core-pulling screw and located on the upper right side of the core-pulling column. The front half of the first linkage gear cooperates with the rear outer wall of the moving mold core, and the rear half of the first linkage gear is rotatably embedded in the front side of the fixed mold core and meshes with the first arc-shaped tooth surface.

3. The injection molding mold for a plastic elbow according to claim 1, wherein The linkage core-pulling assembly also includes a limiting block that is slidably connected in the vertical direction inside the end face of the fixed mold core and located above the straight semi-circular bottom horizontal groove; a straight rack that is vertically fixed on the rear outer wall of the limiting block and staggered from the front and back of the arc-shaped transmission bar; and a second linkage gear that is horizontally and rotatably connected in the vertical direction inside the end face of the fixed mold core and located above or below the arc-shaped transmission bar. The upper or lower outer wall of the arc-shaped transmission bar near its end has a second arc-shaped tooth surface that meshes with the second linkage gear. The straight tooth surface of the straight rack is set towards the direction of the second linkage gear and meshes with the second linkage gear.

4. A mould for injection moulding a plastic elbow according to claim 3, characterised in that The upper outer wall of the traction slider has a base block that is movably inserted into the end face of the fixed mold core. The upper outer wall of the base block and the lower outer wall of the limiting block each have a first clamping block that is vertically arranged and symmetrically distributed in the direction of the straight semi-circular bottom groove. The ends of the two first clamping blocks can be movably inserted into the interior of each straight semi-circular bottom groove.

5. A mould for injection moulding a plastic elbow according to claim 4, characterised in that Each of the first clamping blocks is also fixed with a second clamping block that is vertically arranged and symmetrically distributed, and can be movably inserted into the interior of each straight semi-circular bottom groove. The opposite outer walls of the first clamping block and the second clamping block are provided with symmetrically distributed baffle notches. The middle of the outer wall of the first clamping block and the second clamping block facing the straight semi-circular bottom groove is provided with a symmetrically distributed arc-shaped groove.

6. The injection molding mold for a plastic elbow according to claim 1, wherein The left edge of the end face of the fixed mold core is provided with a forming notch. A vertically arranged sealing plate is also inserted into the fixed mold core. The front part of the sealing plate extends into the interior of the forming notch. The right outer wall of the sealing plate is attached to the inner wall of the forming notch facing the sealing plate. A rectangular opening groove is provided at the front part of the sealing plate. The upper and lower edges of the opening of the rectangular opening groove form an inward arc surface.

7. The injection molding die for a plastic bent pipe according to claim 1, characterized in that, The linkage core-pulling assembly also includes a correction block fixed on the front outer wall of the fixed module and located to the right of the fan-shaped slider. A pressure plate is formed outward on the left outer wall of the correction block. A guide arc surface is formed on the outer wall of the pressure plate facing the fan-shaped slider, which cooperates with the outer arc-shaped outer wall of the fan-shaped slider. Concentrically distributed arc-shaped notches are formed on the guide arc surface. An arc-shaped protrusion is also formed outward on the outer arc-shaped outer wall of the fan-shaped slider, which cooperates with the arc-shaped notches. The arc-shaped protrusion is rotatably embedded in the arc-shaped notches.

8. The injection molding die for a plastic bent pipe according to claim 6, characterized in that, It also includes an inner core forming assembly, which includes a forming slider that is slidably connected to the front side of the fixed module and located to the left of the fixed mold core in the left-right direction, and a forming cylinder fixed to the left outer wall of the fixed module. The telescopic end of the forming cylinder is arranged laterally to the right and fixed on the forming slider. A first base that cooperates with the forming notch is formed on the right outer wall of the forming slider. A straight inner core column that is arranged laterally and cooperates with both straight semi-circular bottom horizontal grooves is formed on the end face of the first base.

9. The injection molding die for a plastic bent pipe according to claim 8, characterized in that, A stop is formed on the front outer wall of the fan-shaped slider. A second base is formed on the upper outer wall of the stop in the direction of the opening at the end of the arc-shaped semi-circular bottom groove. An arc-shaped inner core column is formed on the end face of the second base in the direction of the opening at the end of the arc-shaped semi-circular bottom groove. The end of the arc-shaped inner core column cooperates with the end of the straight inner core column.

10. The injection molding die for a plastic bent pipe according to claim 9, characterized in that, The rear outer wall of the moving mold core and the lower right corner of the front outer wall of the fixed mold core each have a symmetrically arranged guide notch. The fan-shaped slider is rotatably disposed in one of the guide notches on the fixed mold core. The inner corner of the guide notch has a limiting arc surface that cooperates with the inner arc-shaped outer wall of the fan-shaped slider. The front outer wall of the stop block slides against the bottom surface of one of the guide notches of the moving mold core.

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