Pen barrel injection mold and injection molding method

Abstract

The application discloses a pen barrel injection mold and an injection method, which comprises a female mold and a male mold, a female mold plate is arranged in the female mold, a male mold plate is arranged in the male mold, a plurality of sliders arranged in a ring shape and a slider driving mechanism for driving the plurality of sliders to move reversely along the center of the pen barrel are further arranged, an inner extension rod and a threaded rod sleeved outside the inner extension rod are arranged between the female mold plate and the male mold plate, a retreat mechanism arranged in the male mold for driving the inner extension rod and the threaded rod to retreat is further arranged, the female mold plate, the male mold plate, the plurality of sliders, the inner extension rod and the threaded rod jointly form a pen barrel cavity, and a feeding channel communicated with the pen barrel cavity is further arranged. In the application, the plurality of sliders are arranged in a ring shape, so that the setting of a blind hole on the outer side of the front end of the pen barrel can be realized, the retreat mechanism is designed in a step-by-step core-pulling mode, the completion of the threaded rod can be maintained after the core-pulling operation is completed, and only one cylinder is needed for the driving mechanism.

Description

Technical Field

[0001] This invention relates to the field of molds, and particularly to pen barrel injection molds and injection molding methods. Background Technology

[0002] When injection molding the pen barrel, because the inner side of the pen barrel tail is threaded and the outer side of the pen barrel front is blind hole, and the blind hole includes multiple directions, in general molds, the mold is designed with two directions, left and right or front and back. This design cannot make the pen barrel front end form a good blind hole structure, and when performing core pulling operation inside the pen barrel, it is easy to damage the threads inside the pen barrel. Summary of the Invention

[0003] The technical problem solved by this invention is to provide a pen barrel injection mold and injection method that ensures that the pen barrel will not be damaged when the mold is opened and the pen barrel is removed.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a pen barrel injection mold, including a female mold and a male mold, wherein a female template is provided in the female mold and a male template is provided in the male mold, and further includes a plurality of sliders arranged in a ring and a slider driving mechanism for driving the plurality of sliders to move in opposite directions along the center of the pen barrel, wherein an inner extension rod and a threaded rod sleeved outside the inner extension rod are preferably provided between the female template and the male template, and further includes a retraction mechanism provided in the male mold for driving the inner extension rod and the threaded rod to retract, wherein the female template, the male template, the plurality of sliders, the inner extension rod and the threaded rod together constitute the pen barrel cavity, and further includes a material inlet channel communicating with the pen barrel cavity;

[0005] The retraction mechanism includes a driven gear disposed outside the threaded rod, with a driving gear meshing on one side of the driven gear. It also includes a first slider assembly, a second slider assembly, and a firing rod. The firing rod extends into and engages with the driving gear, with one end fixed inside the first slider assembly. The driving gear is located inside the first slider assembly. The mechanism also includes a first slider drive cylinder for driving the first slider assembly to move backward, and a limiting rod with a limiting groove. One end of the limiting rod is fixed to the side of the second slider assembly. A limiting wheel is disposed on one side of the first slider assembly, extending into the limiting groove. The tail end of the inner extension rod is fixed inside the second slider assembly.

[0006] Furthermore, the driven gear is longer than the driving gear, the tail end of the threaded rod is provided with an external thread, the second slider assembly is provided with a threaded sleeve, and the threaded sleeve is provided with an internal thread that mates with the external thread.

[0007] Furthermore, each of the multiple sliders has a protrusion at its front end for forming a blind hole in the pen barrel, and the front ends of the multiple sliders are arranged in a 360-degree circle.

[0008] Furthermore, the plurality of sliders includes an upper slider, a lower slider, an upper left slider, a lower left slider, an upper right slider, and a lower right slider, and the female mold and the male mold are provided with channels for the upper slider, the lower slider, the upper left slider, the lower left slider, the upper right slider, and the lower right slider to move in a predetermined direction;

[0009] The upper slider is fixedly connected to the female mold. The slider driving mechanism includes an upper left slider driving mechanism, a lower left slider driving mechanism, an upper right slider driving mechanism, a lower right slider driving mechanism, and a lower slider driving mechanism. The upper left slider driving mechanism, the lower left slider driving mechanism, the upper right slider driving mechanism, and the lower right slider driving mechanism have the same structure.

[0010] The upper left slider driving mechanism includes an X-axis retracting slider and a Y-axis retracting slider. The Y-axis retracting slider is obliquely provided with a first slide rail. The tail end of the X-axis retracting slider is provided on the first slide rail and can slide along the first slide rail. The front end of the X-axis retracting slider is obliquely provided with a second slide rail. The tail end of the upper left slider is provided on the second slide rail and can slide along the second slide rail. The tail end of the Y-axis retracting slider is provided with a Y-axis retracting slider driving mechanism that drives the Y-axis retracting slider to move along the Y-axis. When the Y-axis retracting slider retracts in the Y-axis direction, the X-axis retracting slider retracts in the X-axis direction, and at the same time, the upper left slider retracts in the radial center direction of the pen barrel.

[0011] Furthermore, the sliding block drive mechanism includes a first retractable slider, the surface of which is provided with an inclined slide rail. The tail end of the sliding block is disposed on the inclined slide rail and can slide along the inclined slide rail. One end of the first retractable slider is fixedly connected to a second retractable slider. An inclined guide post is provided on the female mold, extending into the second retractable slider. A connecting block is provided on the female mold, the inner side of which contacts the second retractable slider, and the inner side of which contacts the inclined surface of the second retractable slider.

[0012] This invention also discloses a pen barrel injection molding method, including the pen barrel injection mold described above. After mold closing, the female mold plate, male mold plate, multiple sliders, inner extension rod, and threaded rod together constitute the pen barrel cavity. Then, injection molding is performed from the material inlet channel. After injection molding, the Y-axis retraction slider drive mechanism moves, causing the Y-axis retraction slider to retract in the Y-axis direction, causing the X-axis retraction slider to retract in the X-axis direction. At the same time, the upper left slider, lower left slider, upper right slider, and lower right slider retract along the radial center direction of the pen barrel. Then, the female mold moves away from the male mold, driving the upper slider to... The upper movement, along with the upward movement of the connecting block and the inclined guide post, causes the second retractable slider to move horizontally outward, thereby causing the lower slider to move downward along the inclined slide rail. Then, the first slider drive cylinder drives the first slider assembly to move backward, simultaneously driving the rifle rod to move backward. The rifle rod drives the drive gear to rotate, the drive gear drives the driven gear to rotate, and the driven gear drives the threaded rod to rotate backward. When the limit wheel contacts the end of the limit waist-shaped groove, the first slider assembly continues to move backward, pulling the second assembly backward through the limit rod, thus driving the inner extension rod to exit the pen barrel.

[0013] The beneficial effects of the present invention are: the surrounding arrangement of multiple sliders in the present invention can realize the setting of blind holes on the outer side of the front end of the pen barrel; at the same time, the step-by-step core pulling design of the retraction mechanism can maintain the integrity of the thread after the core pulling operation is completed; and the drive mechanism only requires one cylinder to complete the operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the pen barrel injection mold according to an embodiment of this application.

[0015] Figure 2 This is a schematic diagram of the retraction mechanism of the pen barrel injection mold according to an embodiment of this application.

[0016] Figure 3 This is a schematic diagram of the internal structure of the retraction mechanism of the pen barrel injection mold according to an embodiment of this application.

[0017] Figure 4 This is a schematic diagram of the structure of multiple sliders in the pen barrel injection mold according to an embodiment of this application.

[0018] Figure 5 This is a schematic diagram of the lower left and lower right sliders of the pen barrel injection mold according to an embodiment of this application.

[0019] Figure 6 This is a schematic diagram of the lower slider of the pen barrel injection mold according to an embodiment of this application.

[0020] The components in the diagram are labeled as follows: female mold 1, male mold 2, inner extension rod 3, threaded rod 4, retraction mechanism 5, driven gear 6, driving gear 7, first slider assembly 8, second slider assembly 9, bolt rod 10, first slider drive cylinder 11, limit rod 12, limit waist groove 13, limit wheel 14, threaded sleeve 15, upper slider 16, lower slider 17, upper left slider 18, lower left slider 19, upper right slider 20, lower right slider 21, X-axis retraction slider 22, Y-axis retraction slider 23, first slide rail 24, second slide rail 25, Y-axis retraction slider drive mechanism 26, first retraction slider 27, oblique slide rail 28, second retraction slider 29, connecting block 30. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the embodiments of this application disclose a pen barrel injection mold, characterized in that: it includes a female mold 1 and a male mold 2, the female mold 1 is provided with a female template, the male mold 2 is provided with a male template, and it also includes a plurality of sliders arranged in a ring and a slider driving mechanism for driving the plurality of sliders to move in opposite directions along the center of the pen barrel. An inner extension rod 3 and a threaded rod 4 sleeved on the outside of the inner extension rod 3 are preferably provided between the female template and the male template. It also includes a retraction mechanism 5 provided in the male mold 2 for driving the inner extension rod 3 and the threaded rod 4 to retract. The female template, the male template, the plurality of sliders, the inner extension rod 3 and the threaded rod 4 together constitute the pen barrel cavity, and it also includes a material feeding channel communicating with the pen barrel cavity.

[0023] The retraction mechanism 5 includes a driven gear 6 disposed outside the threaded rod 4, with a driving gear 7 meshing on one side of the driven gear 6. It also includes a first slider assembly 8, a second slider assembly 9, and a bolt rod 10. The bolt rod 10 extends into the driving gear 7 and engages with it. One end of the bolt rod 10 is fixed inside the first slider assembly 8. The driving gear 7 is located inside the first slider assembly 8. The mechanism also includes a first slider drive cylinder 11 for driving the first slider assembly 8 to move backward. It also includes a limiting rod 12, which has a limiting groove 13. One end of the limiting rod 12 is fixed to the side of the second slider assembly 9. A limiting wheel 14 is disposed on one side of the first slider assembly 8, extending into the limiting groove 13. The tail end of the inner extension rod 3 is fixed inside the second slider assembly 9.

[0024] In practice, after the mold is closed, the female mold plate, male mold plate, multiple sliders, inner extension rod 3, and threaded rod 4 together form the pen barrel cavity. Then, injection molding is performed through the feed channel. After injection molding, the slider drive mechanism drives the slider to retract. Then, the first slider drive cylinder 11 drives the first slider assembly 8 to move backward, which in turn drives the bolt rod 10 to move backward. The bolt rod 10 drives the drive gear 7 to rotate, which in turn drives the driven gear 6 to rotate. The driven gear 6 drives the threaded rod 4 to rotate backward. When the limit wheel 14 contacts the tail end of the limit waist groove 13, the first slider assembly 8 continues to move backward, pulling the second assembly backward through the limit rod 12, which drives the inner extension rod 3 to exit the pen barrel, completing the entire demolding operation.

[0025] In the above structure, the slider is retracted first, then the mold opening operation is performed. Next, the screw rod 4 is rotated and retracted first, and then the core pulling operation of the entire inner extension rod 3 is realized. This ensures that the screw thread is not damaged during the core pulling operation, and the multiple sliders arranged in a ring also ensure the integrity of the blind hole.

[0026] In this embodiment, the length of the driven gear 6 is greater than the length of the driving gear 7, the tail end of the threaded rod 4 is provided with an external thread, and the second slider assembly 9 is provided with a threaded sleeve 15, the threaded sleeve 15 is provided with an internal thread that mates with the external thread.

[0027] In the above structure, during the retraction of the threaded rod 4, the rear end of the threaded rod 4 rotates into the threaded sleeve 15.

[0028] The threaded sleeve 15 in the above structure can ensure the accuracy of the retraction of the threaded rod 4 and reduce damage to the product threads. At the same time, the length of the driven gear 6 is greater than the length of the driving gear 7, which can ensure that even after the threaded rod 4 is retracted, the driving gear 7 can still mesh with the driven gear 6, thereby ensuring the normal operation of the entire mechanism.

[0029] In this embodiment, the front ends of the plurality of sliders are provided with protrusions for forming blind holes in the pen barrel, and the front ends of the plurality of sliders are arranged in a 360-degree circle.

[0030] Specifically, since the blind holes on the pen barrel have six directions, the sliders in this application are designed to be six in number, each corresponding to one of the directions of the blind holes on the pen barrel.

[0031] In this embodiment, the plurality of sliders includes an upper slider 16, a lower slider 17, a connecting block 30, a lower left slider 19, an upper right slider 20, and a lower right slider 21. The female mold 1 and the male mold 2 are provided with channels for the upper slider 16, the lower slider 17, the connecting block 30, the lower left slider 19, the upper right slider 20, and the lower right slider 21 to move in a predetermined direction.

[0032] The upper slider 16 is fixedly connected to the female mold 1. The slider driving mechanism includes a connecting block driving mechanism, a lower left slider driving mechanism, an upper right slider driving mechanism, a lower right slider driving mechanism, and a lower slider driving mechanism. The connecting block driving mechanism, the lower left slider driving mechanism, the upper right slider driving mechanism, and the lower right slider driving mechanism have the same structure.

[0033] The connecting block driving mechanism includes an X-axis retraction slider 22 and a Y-axis retraction slider 23. The Y-axis retraction slider 23 is obliquely provided with a first slide rail 24. The tail end of the X-axis retraction slider 22 is provided on the first slide rail 24 and can slide along the first slide rail 24. The front end of the X-axis retraction slider 22 is obliquely provided with a second slide rail 25. The tail end of the connecting block 30 is provided on the second slide rail 25 and can slide along the second slide rail 25. The tail end of the Y-axis retraction slider 23 is provided with a Y-axis retraction slider driving mechanism 26 that drives the Y-axis retraction slider 23 to move along the Y-axis. When the Y-axis retraction slider 23 retracts in the Y-axis direction, the X-axis retraction slider 22 retracts in the X-axis direction, and at the same time, the connecting block 30 retracts in the radial center direction of the pen barrel.

[0034] The sliding block drive mechanism includes a first retractable slider 27, the surface of which is provided with an inclined slide rail 28. The tail end of the sliding block 17 is provided on the inclined slide rail 28 and can slide along the inclined slide rail 28. One end of the first retractable slider 27 is fixedly connected to a second retractable slider 29. An inclined guide post is provided on the female mold 1, which extends into the second retractable slider 29. A connecting block 30 is provided on the female mold 1, the inner side of which contacts the second retractable slider 29, and the inner side of which contacts the inclined surface of the second retractable slider 29.

[0035] In actual operation, after injection molding, the Y-axis retraction slider drive mechanism 26 moves, causing the Y-axis retraction slider 23 to retract in the Y-axis direction, which in turn causes the X-axis retraction slider 22 to retract in the X-axis direction. At the same time, the connecting block 30, the lower left slider 19, the upper right slider 20, and the lower right slider 21 retract along the radial center direction of the pen barrel. Then, the female mold 1 moves away from the male mold 2, driving the upper slider 16 to move upward. At the same time, the connecting block 30 and the inclined guide post move upward, causing the second retraction slider 29 to move horizontally outward, thereby causing the lower slider 17 to move downward along the inclined slide rail 28, thus completing the retraction operation of the six sliders.

[0036] In the above structure, the six sliders can be retracted from six directions. During the retraction operation, the direction of the slider corresponds one-to-one with that of the blind hole, and the six sliders do not interfere with each other, thus ensuring the accuracy of the blind hole setting.

[0037] This invention also discloses a pen barrel injection molding method, including the pen barrel injection mold described above. Specifically, after mold closing, the female mold plate, male mold plate, multiple sliders, inner extension rod 3, and threaded rod 4 together constitute the pen barrel cavity. Then, injection molding is performed from the material inlet channel. After injection molding, the Y-axis retraction slider drive mechanism 26 moves, causing the Y-axis retraction slider 23 to retract in the Y-axis direction, causing the X-axis retraction slider 22 to retract in the X-axis direction. At the same time, the connecting block 30, the lower left slider 19, the upper right slider 20, and the lower right slider 21 retract along the radial center direction of the pen barrel. Then, the female mold 1 moves away from the male mold 2, driving the upper slider 16 to move upward. Simultaneously, the connecting block 30 and the inclined guide post move upward, causing the second retractable slider 29 to move horizontally outward, thereby causing the lower slider 17 to move downward along the inclined slide rail 28. Then, the first slider drive cylinder 11 drives the first slider assembly 8 to move backward, simultaneously driving the rifle rod 10 to move backward. The rifle rod 10 drives the drive gear 7 to rotate, the drive gear 7 drives the driven gear 6 to rotate, and the driven gear 6 drives the threaded rod 4 to rotate backward. When the limiting wheel 14 contacts the tail end of the limiting waist groove 13, the first slider assembly 8 continues to move backward, pulling the second assembly backward through the limiting rod 12, that is, driving the inner extension rod 3 to exit the pen barrel.

[0038] In this invention, the surrounding arrangement of multiple sliders enables the setting of blind holes on the outer side of the pen barrel front end. At the same time, the step-by-step core-pulling design of the retraction mechanism 5 ensures that the thread integrity is maintained after the core-pulling operation is completed, and the drive mechanism only requires one cylinder to complete the operation.

[0039] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pen barrel injection mold, characterized in that: The device includes a female mold (1) and a male mold (2). The female mold (1) is provided with a female template, and the male mold (2) is provided with a male template. It also includes multiple sliders arranged in a ring and a slider driving mechanism that drives the multiple sliders to move in the opposite direction along the center of the pen barrel. An inner extension rod (3) and a threaded rod (4) sleeved on the outside of the inner extension rod (3) are provided between the female template and the male template. It also includes a retraction mechanism (5) provided in the male mold (2) for driving the inner extension rod (3) and the threaded rod (4) to retract. The female template, the male template, the multiple sliders, the inner extension rod (3) and the threaded rod (4) together constitute the pen barrel cavity. It also includes a material feeding channel that communicates with the pen barrel cavity. The retraction mechanism (5) includes a driven gear (6) disposed outside the threaded rod (4), a driving gear (7) meshing on one side of the driven gear (6), a first slider assembly (8), a second slider assembly (9), and a bolt (10). The bolt (10) extends into the driving gear (7) and is connected to the driving gear (7). One end of the bolt (10) is fixed inside the first slider assembly (8). The driving gear (7) is located inside the first slider assembly (8). The mechanism also includes a first slider drive cylinder (11) for driving the first slider assembly (8) to move backward. It also includes a limiting rod (12). A limiting groove (13) is provided on the limiting rod (12). One end of the limiting rod (12) is fixed to the side of the second slider assembly (9). A limiting wheel (14) is provided on one side of the first slider assembly (8). The limiting wheel (14) extends into the limiting groove (13). The tail end of the inner extension rod (3) is fixed inside the second slider assembly (9). The front ends of the plurality of sliders are provided with protrusions for forming blind holes in the pen barrel, and the front ends of the plurality of sliders are arranged in a 360-degree circle, with the blind holes including multiple directions; The plurality of sliders includes an upper slider (16), a lower slider (17), an upper left slider (18), a lower left slider (19), an upper right slider (20), and a lower right slider (21). The female mold (1) and the male mold (2) are provided with channels for the upper slider (16), the lower slider (17), the upper left slider (18), the lower left slider (19), the upper right slider (20), and the lower right slider (21) to move in a predetermined direction. The upper slider (16) is fixedly connected to the female mold (1). The slider driving mechanism includes an upper left slider driving mechanism, a lower left slider driving mechanism, an upper right slider driving mechanism, a lower right slider driving mechanism and a lower slider driving mechanism. The upper left slider driving mechanism, the lower left slider driving mechanism, the upper right slider driving mechanism and the lower right slider driving mechanism have the same structure. The slider driving mechanism includes an X-axis retractable slider (22) and a Y-axis retractable slider (23). The Y-axis retractable slider (23) is obliquely provided with a first slide rail (24). The tail end of the X-axis retractable slider (22) is provided on the first slide rail (24) and can slide along the first slide rail (24). The front end of the X-axis retractable slider (22) is obliquely provided with a second slide rail (25). The tail end of the upper left slider is provided on the second slide rail (25) and can slide along the second slide rail (25). The tail end of the Y-axis retractable slider (23) is provided with a Y-axis retractable slider driving mechanism (26) that drives the Y-axis retractable slider (23) to move along the Y-axis. When the Y-axis retractable slider (23) retracts in the Y-axis direction, the X-axis retractable slider (22) retracts in the X-axis direction, and at the same time, the upper left slider retracts in the radial center direction of the pen barrel.

2. The pen barrel injection mold as described in claim 1, characterized in that: The driven gear (6) is longer than the driving gear (7). The tail end of the threaded rod (4) is provided with an external thread. The second slider assembly (9) is provided with a threaded sleeve (15). The threaded sleeve (15) is provided with an internal thread that mates with the external thread.

3. The pen barrel injection mold as described in claim 1, characterized in that: The sliding block drive mechanism includes a first retractable slider (27), the surface of which is provided with an inclined slide rail (28), the tail end of which is provided on the inclined slide rail (28) and can slide along the inclined slide rail (28), one end of which is fixedly connected to a second retractable slider (29), the female mold (1) is provided with an inclined guide post, which extends into the second retractable slider (29), the female mold (1) is provided with a connecting block (30), the inner side of which contacts the second retractable slider (29), and the inner side of which contacts the inclined surface of the second retractable slider (29).

4. A pen barrel injection molding method, comprising the pen barrel injection mold as described in claim 3, characterized in that: After the mold is closed, the female mold plate, male mold plate, multiple sliders, inner extension rod (3) and threaded rod (4) together form the pen barrel cavity. Then, the injection molding operation is performed from the feed channel. After injection molding, the Y-axis retraction slider drive mechanism (26) moves, causing the Y-axis retraction slider (23) to retract in the Y-axis direction, causing the X-axis retraction slider (22) to retract in the X-axis direction. At the same time, the upper left slider (18), lower left slider (19), upper right slider (20) and lower right slider (21) retract along the radial center direction of the pen barrel. Then, the female mold (1) moves away from the male mold (2), driving the upper slider (16) to move upward. At the same time, the connecting block (30) and the inclined guide post move upward, causing the first The second sliding block (29) moves horizontally outward, causing the lower sliding block (17) to move downward along the inclined slide rail (28). Then, the first sliding block drive cylinder (11) drives the first sliding block assembly (8) to move backward, which in turn drives the rifle rod (10) to move backward. The rifle rod (10) drives the drive gear (7) to rotate, and the drive gear (7) drives the driven gear (6) to rotate. The driven gear (6) drives the threaded rod (4) to rotate backward. When the limiting wheel (14) contacts the end of the limiting waist groove (13), the first sliding block assembly (8) continues to move backward, and the limiting rod (12) pulls the second sliding assembly to move backward, which drives the inner extension rod (3) to exit the pen barrel.

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