Injection mold for an internally threaded flat injection molded part

Abstract

The utility model relates to the field of injection molding, the utility model discloses a female thread flat injection molding's injection mold, include: water gap board, front mould, back mould, backing plate and twist tooth mechanism, water gap board, front mould, back mould and backing plate set gradually, and twist tooth mechanism includes: two forming subassembly, drive part, first transmission part and second transmission part, and forming subassembly includes a plurality of core prints that distribute gradually along the length direction of back mould, and core print all includes core print main part, hollow shaft and top rod, and hollow shaft rotatablely set up in backing plate, and drive part detachably set up in the side of backing plate, and first transmission part transmission is connected between the adjacent hollow shaft, and second transmission part transmission is connected between drive part and hollow shaft. A plurality of core print main parts are drivenly connected through first transmission part between the plurality of core print main parts, make a plurality of core print main parts synchronous rotation and the same rotating direction. Drive part can be freely installed on any one side wall of backing plate, and drive part drives a plurality of core print main parts synchronous rotation through second transmission part.

Description

Technical Field

[0001] This utility model relates to the field of injection molding, and in particular to an injection mold for a flat injection molded part with internal threads. Background Technology

[0002] As shown in Figure 4, the plastic shell is 15mm high and has external threads on its inner wall. The height of the external threads is only 9mm, and the pitch is small. Therefore, the threads on the inner wall of the plastic shell need to be formed in one go. Common threading mechanisms in injection molds mainly use a motor to drive the core body to automatically thread through a sprocket and chain, or a hydraulic cylinder to drive the core body to automatically thread through a gear and rack.

[0003] However, in actual use, for molds with small cores and multiple core bodies densely arranged within them, the small size of the cores and the presence of ejector pins for ejecting solidified material from the runners can cause interference between the ejector pins and the chain / rack, which are positioned along the movement paths of the chain and rack. This interference leads to difficulties in machining. Utility Model Content

[0004] The purpose of this invention is to provide an injection mold for a flat injection molded part with internal threads, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an injection mold for an internally threaded flat injection molded part, comprising: a sprue plate, a front mold, a rear mold, a backing plate, and a threading mechanism, wherein the sprue plate, the front mold, the rear mold, and the backing plate are arranged sequentially, and the threading mechanism comprises: Two molding components are arranged sequentially on the rear mold along the width direction of the rear mold. Each molding component includes several cores arranged sequentially along the length direction of the rear mold. Each core includes a core body, a hollow shaft, and an ejector pin. The core body rotatably passes through the rear mold. The hollow shaft is fixedly connected to the core body and rotatably disposed on a pad. The ejector pin passes through the hollow shaft and the core body in sequence. A drive component, which is detachably connected to any side of the pad; The first transmission component is connected to four adjacent hollow shafts. The second transmission component is rotatably connected to the pad, one end of the second transmission component is connected to the drive component, and the other end of the second transmission component is connected to any two adjacent hollow shafts.

[0006] Preferably, the first transmission component includes a first rotating shaft, a first gear, and a second gear. The first gear is slidably connected to the hollow shaft, the second gear is fixedly connected to the hollow shaft, the first rotating shaft is rotatably connected to the pad, and the first gear and the second gear mesh with each other.

[0007] Preferably, the second transmission component includes a second rotating shaft and a third gear, the third gear being disposed on the second rotating shaft, and the end of the first gear away from the second gear meshing with the third gear.

[0008] Preferably, the driving component includes a fixed base, a servo motor, an output gear, and a main gear. The fixed base is detachably mounted on the side of the pad, the servo motor is mounted on the fixed base, the output gear is mounted on the output shaft of the servo motor, and the main gear and the second rotating shaft are rotatably connected to the fixed base. The output gear, the main gear, and the third gear mesh sequentially.

[0009] Preferably, the pad has a first groove and a second groove that are interconnected. The second groove is evenly spaced around the first groove and extends to the side of the pad. The first rotating shaft, the hollow shaft and the second rotating shaft are all distributed inside the first groove, and the main gear is distributed inside the second groove.

[0010] Preferably, one end of the fixed base is provided with a protrusion, and a stepped groove is provided at the edge of the bottom of the first groove. The stepped groove is connected to the second groove. The two ends of the protrusion are respectively distributed inside the second groove and the stepped groove. The surface of the protrusion near the front mold core is coplanar with the bottom of the first groove. The main gear and the second rotating shaft are rotatably connected to the two ends of the protrusion.

[0011] Preferably, the rear mold has a tapered hole, the core body passes through the tapered hole, the diameter of the tapered hole increases gradually in the direction away from the front mold core, the end of the tapered hole near the front mold core is taper-fitted with the core body, and the end of the tapered hole away from the front mold core is clearance-fitted with the core body.

[0012] Preferably, the upper end of the core body is provided with a threaded groove and an venting groove in sequence along the direction away from the front mold core. The venting groove is connected to the threaded groove and extends to the surface of the rear mold away from the front mold. The venting groove is spiral-shaped and the inner diameter of the venting groove is smaller than the outer diameter of the threaded groove.

[0013] Preferably, a first bearing and a second bearing are slidably disposed on the hollow shaft, the first gear is distributed between the first bearing and the second bearing, the first bearing is rotatably connected to the rear mold, and the second bearing is rotatably connected to the bottom of the first groove.

[0014] Preferably, the injection mold for the internally threaded flat injection molded part further includes an ejector plate. The ejector plate includes a cylinder and a cuboid that are fixedly connected to each other. The cuboid is disposed inside the ejector plate, and the cylinder passes through the ejector plate, the pad, the hollow shaft and the core body in sequence.

[0015] The beneficial effects of this utility model are as follows: multiple core bodies are connected by a first transmission component, enabling them to rotate synchronously in the same direction. The drive component can be freely installed on any side wall of the pad, and drives the multiple core bodies to rotate synchronously through a second transmission component. The drive component can be installed on a side with fewer structural elements as needed, avoiding interference between the second transmission component and the drive component on other structures. Attached Figure Description

[0016] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of an injection mold provided in an embodiment of the present invention; Figure 2 This is a front view of an injection mold provided according to an embodiment of the present invention; Figure 3 A cross-sectional view of an injection mold provided in an embodiment of this utility model; Figure 4 This is a structural schematic diagram of an internally threaded flat injection molded part provided in an embodiment of the present invention; Markings in the diagram: 1: Sprue plate; 2: Front mold; 3: Rear mold; 4: Backing plate; 5: Ejector plate; 6: Ejector rod; 7: Hollow shaft; 8: Core body; 9: First rotating shaft; 10: First gear; 11: Second gear; 12: Second rotating shaft; 13: Third gear; 14: Main gear; 15: Fixed base; 16: Servo motor; 17: First groove; 18: Second groove; 19: Step groove. Detailed Implementation

[0018] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0019] It should be noted that, in this utility model, unless otherwise stated, when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element present. "Inner" and "outer" refer to the inner and outer contours.

[0020] like Figures 1-3As shown in the figure, an injection mold for an internally threaded flat injection molded part provided in one embodiment of the present invention includes: a sprue plate 1, a front mold 2, a rear mold 3, a backing plate 4, and a threading mechanism. The sprue plate 1, the front mold 2, the rear mold 3, and the backing plate 4 are arranged sequentially. The threading mechanism includes: Two molding components are arranged sequentially on the rear mold 3 along the width direction. Each molding component includes a plurality of cores arranged sequentially along the length direction of the rear mold 3. Each core includes a core body 8, a hollow shaft 7 and an ejector rod 6. The core body 8 rotatably passes through the rear mold 3. The hollow shaft 7 is fixedly connected to the core body 8 and rotatably disposed on the pad 4. The ejector rod 6 passes through the hollow shaft 7 and the core body 8 in sequence. A driving component, which is detachably connected to any side of the pad 4; The first transmission component is connected to four adjacent hollow shafts 7. The second transmission component is rotatably connected to the pad 4, one end of the second transmission component is connected to the drive component, and the other end of the second transmission component is connected to any two adjacent hollow shafts 7.

[0021] The first transmission component includes a first rotating shaft 9, a first gear 10, and a second gear 11. The first gear 10 is slidably connected to the hollow shaft 7, and the second gear 11 is fixedly connected to the hollow shaft. The first rotating shaft 9 is rotatably connected to the pad 4, and the first gear 10 and the second gear 11 mesh with each other. The first rotating shaft 9 supports the second gear 11 and is located between four hollow shafts 7. The first gears 10 on the four hollow shafts 7 are all meshed with the middle second gear 11, and the second gear 11 drives the first gear 10 to rotate synchronously with the hollow shaft 7.

[0022] The second transmission component includes a second rotating shaft 12 and a third gear 13. The third gear 13 is mounted on the second rotating shaft 12, and the end of the first gear 10 away from the second gear 11 meshes with the third gear 13. The third gear 13 is fixed to the second rotating shaft 12 by a key connection, and one end of the second rotating shaft 12 is rotatably connected to a pad 4. The second rotating shaft 12 supports the third gear 13. The third gear 13 drives the first transmission component to rotate synchronously with the hollow shaft 7.

[0023] The driving component includes a fixed base 15, a servo motor 16, an output gear, and a main gear 14. The fixed base 15 is detachably mounted on the side of the pad 4. The servo motor 16 is mounted on the fixed base 15. The output gear is mounted on the output shaft of the servo motor 16. The main gear 14 and the second rotating shaft 12 are rotatably connected to the fixed base 15. The output gear, main gear 14, and third gear 13 mesh sequentially. The servo motor 16 is a servo motor equipped with a gear reducer. The servo motor 16 drives the main gear 14 to rotate, which in turn drives the third gear 13 to rotate. The third gear 13 drives any two first gears 10 to rotate, thereby causing each first gear 10 and each second gear 11 to rotate synchronously.

[0024] The pad 4 has a first groove 17 and a second groove 18 that are interconnected. The second groove 18 is evenly spaced around the first groove 17 and extends to the side of the pad 4. The first rotating shaft 9, the hollow shaft 7, and the second rotating shaft 12 are all located inside the first groove 17, and the main gear 14 is located inside the second groove 18. The first groove 17 accommodates the hollow shaft 7, the first transmission component, and the second transmission component, while the second groove 18 accommodates the main gear 14. The second rotating shaft 12 and the main gear 14 are fixed in position to avoid interfering with other moving parts inside the mold.

[0025] The fixed base 15 has a protrusion at one end, and a stepped groove 19 is formed at the edge of the bottom of the first groove 17. The stepped groove 19 communicates with the second groove 18. The two ends of the protrusion are respectively distributed inside the second groove 18 and the stepped groove 19. The surface of the protrusion near the front mold core 2 is coplanar with the bottom of the first groove 17. The main gear 14 and the second rotating shaft 12 are rotatably connected to the two ends of the protrusion. The main gear 14 and the third gear 13 are supported by the protrusion. When the fixed base 15 is installed on the side of the pad 4, the protrusion will be inserted into the second groove 18 and the stepped groove 19, and the main gear 14 and the third gear 13 will be moved into the pad 4 by the protrusion. By observing whether the protrusion is installed in place, it can be determined whether the main gear 14 and the third gear 13 are installed in place and meshing with the first gear 10.

[0026] The rear mold 3 has a tapered hole through which the core body 8 passes. The diameter of the tapered hole increases progressively away from the front mold core 2. The end of the tapered hole near the front mold core 2 is taper-fitted with the core body 8, while the end away from the front mold core 2 is clearance-fitted with the core body 8. The middle portion of the core body 8 passes through the tapered hole and slides against the inner wall of the tapered hole. The sliding range between the core body 8 and the hollow shaft 7 is limited by the tapered hole.

[0027] The upper end of the core body 8 is provided with a threaded groove and a venting groove in sequence along the direction away from the front mold 2. The venting groove is connected to the threaded groove and extends to the surface of the rear mold 3 away from the front mold 2. The venting groove is spiral-shaped, and its inner diameter is smaller than the outer diameter of the threaded groove. The threaded groove is used to form threads on the inner wall of the product. Gas inside the cavity is discharged through the venting groove and guided to the gap between the backing plate 4 and the rear mold 3, and then discharged to the outside of the mold.

[0028] A first bearing and a second bearing are slidably mounted on the hollow shaft 7. The first gear 10 is distributed between the first bearing and the second bearing. The first bearing is rotatably connected to the rear mold 3, and the second bearing is rotatably connected to the bottom of the first groove 17. The inner ring of the first bearing is slidably connected to the hollow shaft 7, and the outer ring of the first bearing is interference-fitted with the rear mold 3. The inner ring of the second bearing is slidably connected to the hollow shaft 7, and the outer ring of the second bearing is interference-fitted into the bottom of the first groove 17. The first bearing and the second bearing guide the hollow shaft 7 and the first gear 10.

[0029] The injection mold for the internally threaded flat injection molded part also includes an ejector plate 6 5. The ejector plate 6 5 comprises a cylinder and a cuboid fixedly connected to each other. The cuboid is disposed inside the ejector plate 6 5 5. The cylinder sequentially passes through the ejector plate 6 5 5 5 6 ...

[0030] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these should all be considered to be within the scope of this specification.

Claims

1. An injection mold for a flat injection molded part with internal threads, characterized in that: include: The system comprises a sprue plate, a front mold, a rear mold, a backing plate, and a threaded joint mechanism, wherein the sprue plate, the front mold, the rear mold, and the backing plate are arranged sequentially, and the threaded joint mechanism includes: Two molding components are arranged sequentially on the rear mold along the width direction of the rear mold. Each molding component includes a plurality of cores arranged sequentially along the length direction of the rear mold. Each core includes a core body, a hollow shaft and an ejector pin. The core body rotatably passes through the rear mold. The hollow shaft is fixedly connected to the core body and rotatably disposed on a pad. The ejector pin passes through the hollow shaft and the core body in sequence. A drive component, which is detachably connected to any side of the pad; The first transmission component is connected to four adjacent hollow shafts. The second transmission component is rotatably connected to the pad, one end of the second transmission component is connected to the drive component, and the other end of the second transmission component is connected to any two adjacent hollow shafts.

2. The injection mold for the internally threaded flat injection molded part according to claim 1, characterized in that: The first transmission component includes a first rotating shaft, a first gear, and a second gear. The first gear is slidably connected to the hollow shaft, and the second gear is fixedly connected to the hollow shaft. The first rotating shaft is rotatably connected to a pad, and the first gear and the second gear mesh with each other.

3. The injection mold for the internally threaded flat injection molded part according to claim 2, characterized in that: The second transmission component includes a second rotating shaft and a third gear. The third gear is disposed on the second rotating shaft, and the end of the first gear away from the second gear meshes with the third gear.

4. The injection mold for the internally threaded flat injection molded part according to claim 3, characterized in that: The driving component includes a fixed base, a servo motor, an output gear, and a main gear. The fixed base is detachably mounted on the side of the pad. The servo motor is mounted on the fixed base. The output gear is mounted on the output shaft of the servo motor. The main gear and the second rotating shaft are rotatably connected to the fixed base. The output gear, the main gear, and the third gear mesh sequentially.

5. The injection mold for the internally threaded flat injection molded part according to claim 4, characterized in that: The pad has a first groove and a second groove that are interconnected. The second groove is evenly spaced around the first groove and extends to the side of the pad. The first rotating shaft, the hollow shaft and the second rotating shaft are all distributed inside the first groove, and the main gear is distributed inside the second groove.

6. The injection mold for the internally threaded flat injection molded part according to claim 5, characterized in that: One end of the fixed base is provided with a protrusion, and a stepped groove is provided at the edge of the bottom of the first groove. The stepped groove is connected to the second groove. The two ends of the protrusion are respectively distributed inside the second groove and the stepped groove. The surface of the protrusion near the front mold core is coplanar with the bottom of the first groove. The main gear and the second rotating shaft are rotatably connected to the two ends of the protrusion.

7. The injection mold for the internally threaded flat injection molded part according to claim 1, characterized in that: The rear mold has a tapered hole, and the core body passes through the tapered hole. The diameter of the tapered hole increases in a stepwise manner away from the front mold core. The end of the tapered hole near the front mold core is taper-fitted with the core body, and the end of the tapered hole away from the front mold core is clearance-fitted with the core body.

8. The injection mold for the internally threaded flat injection molded part according to claim 1, characterized in that: The upper end of the core body is provided with a threaded groove and an venting groove in sequence along the direction away from the front mold core. The venting groove is connected to the threaded groove and extends to the surface of the rear mold away from the front mold. The venting groove is spiral-shaped and the inner diameter of the venting groove is smaller than the outer diameter of the threaded groove.

9. The injection mold for the internally threaded flat injection molded part according to claim 2, characterized in that: A first bearing and a second bearing are slidably mounted on the hollow shaft. The first gear is distributed between the first bearing and the second bearing. The first bearing is rotatably connected to the rear mold, and the second bearing is rotatably connected to the bottom of the first groove.

10. The injection mold for the internally threaded flat injection molded part according to claim 1, characterized in that: The injection mold also includes an ejector plate, which includes a cylinder and a cuboid that are fixedly connected to each other. The cuboid is disposed inside the ejector plate, and the cylinder passes through the ejector plate, the pad, the hollow shaft and the core body in sequence.

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