Rotary guide core-pulling structure capable of shortening injection molding period

Abstract

The utility model discloses a rotary guide core-pulling structure capable of shortening an injection molding period, and relates to the technical field of injection molds. Comprising a bottom die main body, the bottom die main body is provided with a guide core-pulling mechanism used for an injection mold, the guide core-pulling mechanism comprises a rotating assembly and a fixing block arranged on the side wall of the bottom die main body, and a locking block is connected with a locking groove in a clamping mode, so that a connecting block can be effectively fixed; the connecting block is prevented from moving due to pressure fluctuation of the hydraulic rod or other factors, so that stable meshing of the gear rod and the annular gear is guaranteed, high pressure in the injection molding process is effectively resisted through rigid locking, displacement of the mold core is prevented, and the forming precision of precise structures such as threads is guaranteed; the energy is saved, the action time is shortened, locking and unlocking operation can be achieved by rotating the screw, and the device is simple, convenient and easy to control.

Description

A rotary guide core-pulling structure for shortening injection molding cycle Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically a rotary guide core-pulling structure for shortening the injection cycle. Background Technology

[0002] In the field of injection molding of plastic products, with the continuous development of industrial design and the increasing diversification of market demands, plastic products with complex structures, such as those with side holes, side recesses, or undercuts, are being used more and more widely. The existence of these complex structures places higher demands on the core-pulling technology of injection molds.

[0003] Reference patent (Publication No.: CN219968702U; Publication Date: 2023-11-07) discloses a rotary core-pulling mechanism for injection molds, including a motor, a pad, a first connecting plate, a second connecting plate, a pad, a screw, a screw sleeve, a connecting block, a rack, a gear, a rotating block, a positioning guide rod, a rear mold insert, a front mold insert, a front mold core, a rear mold core, an A plate, a B plate, and an injection molded product. It is used for injection molding of semi-annular tubular structures with one end closed. The motor-driven rotary core-pulling mechanism completes the annular core-pulling action of the injection molded product. This mechanism has a simple structure, is easy to manufacture, and can improve injection molding production efficiency.

[0004] Based on the aforementioned patents, traditional linear core-pulling methods typically employ linear motion mechanisms such as sliders to achieve the core-pulling action. During mold design, the movement direction and spatial layout of the slider are significantly limited. For some plastic products with special shapes or complex structures, it is difficult to find a suitable linear core-pulling direction and spatial position, resulting in a complex mold structure. Furthermore, the use of gear rods to drive gears and rotate blocks for core-pulling is prone to deviation due to the lack of a guiding structure. Additionally, during injection molding, it is impossible to lock and fix the core, leading to gaps between the gears and the rack, which can easily cause shaking. Therefore, this utility model provides a rotary guide core-pulling structure that shortens the injection molding cycle. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a rotary guide core-pulling structure that shortens the injection molding cycle. It solves the problem that traditional linear core-pulling methods typically use linear motion mechanisms such as sliders to achieve the core-pulling action. During mold design, the slider's movement direction and spatial layout are significantly limited. For some plastic products with special shapes or complex structures, it is difficult to find a suitable linear core-pulling direction and spatial position, leading to a complex mold structure. Furthermore, using a gear rod to drive the rotating block for core-pulling is prone to misalignment due to the lack of a guiding structure. Additionally, during injection molding, it is impossible to lock and fix the gear rod, resulting in gaps between the gear and the gear rod, which can easily cause shaking.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rotary guide core-pulling structure for shortening the injection molding cycle, comprising a bottom mold body, wherein the bottom mold body is provided with a guide core-pulling mechanism for the injection mold, the guide core-pulling mechanism comprising:

[0007] The rotating assembly includes a fixing block disposed on the side wall of the bottom mold body, a connecting block connected by a telescopic assembly on one side of the fixing block, a gear rod fixed on one side of the connecting block, a support block fixed inside the bottom mold body, and a ring gear connected by a guide assembly at the upper end of the support block.

[0008] The locking assembly includes a locking groove on one side of the connecting block, a slide rail bracket fixed to the upper end face of the fixing block, and a locking block connected by a pushing assembly inside the slide rail bracket.

[0009] Preferably, an upper mold body is provided at the upper end of the bottom mold body, and an injection port for feeding material is provided at the upper end of the upper mold body.

[0010] Preferably, the telescopic assembly includes a fixing rod fixed to one side wall of a fixing block, a hydraulic rod fixed to one end of the fixing rod, and a connecting block fixedly connected to the telescopic end of the hydraulic rod.

[0011] Preferably, the guide assembly includes a fixing plate fixed to one side of the upper end of the support block, a guide rod fixed to the inner wall of the fixing plate, a ring gear located on the outer wall of the guide rod, the ring gear being slidably connected to the guide rod, the ring gear being meshed with the gear rod, and a guide plate for the gear rod to slide against the edge of the support block.

[0012] Preferably, a rotating block is fixed to the upper end of the ring gear, and an insert block is fixed to the upper end of the rotating block.

[0013] Preferably, the jacking assembly includes a screw rotatably connected inside the slide rail bracket, a slider slidably connected to the inner wall of the slide rail bracket, the slider being threadedly connected to the screw, a locking block being fixedly connected to one end of the slider, and the locking block being engaged with a locking groove on the side wall of the connecting block.

[0014] Beneficial effects

[0015] This invention provides a rotary guide core-pulling structure for shortening the injection molding cycle. Compared with the prior art, it has the following advantages:

[0016] Firstly, the linear motion of the gear rod in this invention causes the ring gear to rotate around the guide rod. When the ring gear rotates, it drives the rotating block fixed on its upper end to rotate, which in turn drives the insert block to rotate, realizing actions such as core pulling or resetting. By converting the linear motion of the hydraulic rod into the rotational motion of the ring gear, which in turn drives the insert block to rotate, it can meet the core pulling requirements of plastic products with side holes, side recesses, or undercuts. Compared with the traditional linear core pulling method, it provides more flexibility for mold design. Moreover, the setting of the guide rod and guide plate ensures the stable meshing of the gear rod and the ring gear, reduces vibration and error in the transmission process, and improves the accuracy and stability of core pulling. The layout of each component is reasonable, realizing complex rotary core pulling functions within a limited space.

[0017] Secondly, this utility model effectively fixes the connecting block by engaging the locking block with the locking groove, preventing the connecting block from moving due to pressure fluctuations in the hydraulic rod or other factors. This ensures stable meshing between the gear rod and the ring gear. Through rigid locking, it effectively resists high pressure during the injection molding process, prevents core displacement, and ensures the molding accuracy of precision structures such as threads. The hydraulic rod does not need to maintain pressure continuously; it only needs to be activated during core pulling, saving energy and shortening the operation time. Locking and unlocking operations can be achieved by rotating the screw, which is simple, convenient, and easy to control. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 is a schematic diagram of the ring gear structure of this utility model;

[0020] Figure 3 is a schematic diagram of the insert block structure of this utility model;

[0021] Figure 4 is a schematic diagram of the gear rod structure of this utility model;

[0022] Figure 5 is a schematic cross-sectional view of the locking block of this utility model.

[0023] In the diagram: 1. Bottom mold body; 2. Upper mold body; 3. Fixing block; 301. Fixing rod; 302. Hydraulic rod; 303. Connecting block; 4. Gear rod; 401. Support block; 402. Fixing plate; 403. Guide rod; 404. Ring gear; 5. Rotating block; 501. Insert block; 6. Slide rail bracket; 601. Screw; 602. Slider; 603. Locking block; 604. Locking groove; 7. Guide plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please refer to Figures 1-5. This utility model provides a technical solution: a rotary guide core-pulling structure for shortening the injection molding cycle, including a bottom mold body 1. The bottom mold body 1 is provided with a guide core-pulling mechanism for the injection mold. The guide core-pulling mechanism includes:

[0026] The rotating component includes a fixing block 3 provided on the side wall of the bottom mold body 1, a connecting block 303 connected by a telescopic component on one side of the fixing block 3, a gear rod 4 fixed on one side of the connecting block 303, a support block 401 fixed inside the bottom mold body 1, and a ring gear 404 connected by a guide component at the upper end of the support block 401.

[0027] The locking assembly includes a locking groove 604 on one side of the connecting block 303, a slide rail bracket 6 fixed on the upper end face of the fixing block 3, and a locking block 603 connected by a push assembly inside the slide rail bracket 6.

[0028] In a preferred embodiment, an upper mold body 2 is provided at the upper end of the bottom mold body 1, and an injection port for feeding material is provided at the upper end of the upper mold body 2.

[0029] In a preferred embodiment, the telescopic assembly includes a fixed rod 301 fixed to one side wall of a fixed block 3, a hydraulic rod 302 fixed to one end of the fixed rod 301, and a connecting block 303 fixedly connected to the telescopic end of the hydraulic rod 302. The guide assembly includes a fixed plate 402 fixed to one side of the upper end of a support block 401, a guide rod 403 fixed to the inner wall of the fixed plate 402, a ring gear 404 located on the outer wall of the guide rod 403, the ring gear 404 and the guide rod 403 being slidably connected, and the ring gear 404 and the gear rod 4 being meshed. A guide plate 7 for the gear rod 4 to slide against the edge of the support block 401 is fixed, a rotating block 5 is fixed to the upper end of the ring gear 404, and an insert block 501 is fixed to the upper end of the rotating block 5. When the hydraulic rod 302 is activated, under the fixed support of the fixed rod 301, the telescopic end of the hydraulic rod 302 drives the connecting block 303 to move linearly.

[0030] When the connecting block 303 moves, it drives the gear rod 4 fixed on it to move. Since the gear rod 4 meshes with the ring gear 404, and the ring gear 404 can only rotate under the guidance of the guide rod 403, the linear motion of the gear rod 4 will cause the ring gear 404 to rotate around the guide rod 403. When the ring gear 404 rotates, it drives the rotating block 5 fixed on its upper end to rotate, which in turn drives the insert block 501 to rotate, realizing actions such as core pulling or resetting. The linear motion of the hydraulic rod 302 is converted into the rotational motion of the ring gear 404, which in turn drives the insert block 501 to rotate. This can meet the core pulling requirements of plastic products with side holes, side recesses or undercuts. Compared with the traditional linear core pulling method, it provides more flexibility for mold design. The setting of the guide rod 403 and the guide plate 7 ensures the stable meshing of the gear rod 4 and the ring gear 404, reduces vibration and error in the transmission process, and improves the accuracy and stability of core pulling. The layout of each component is reasonable, realizing complex rotary core pulling functions in a limited space.

[0031] Additional explanation: The rotary core-pulling method can complete the core-pulling action of multiple side holes or side recesses in one go by rotating the insert block 501. The insert block 501 can be customized according to the structural characteristics of the product. During the rotation process, different parts of it can be separated from the corresponding structure of the product in sequence, avoiding interference between multiple linear core-pulling mechanisms, thus better adapting to the core-pulling needs of complex products.

[0032] Furthermore, the guide plate 7 serves as an auxiliary guide to ensure the stability of the movement of the gear rod 4, so that it always meshes well with the ring gear 404.

[0033] In a preferred embodiment, the jacking assembly includes a screw 601 rotatably connected inside the slide rail bracket 6, a slider 602 slidably connected to the inner wall of the slide rail bracket 6, the slider 602 being threadedly connected to the screw 601, a locking block 603 being fixedly connected to one end of the slider 602, and the locking block 603 being engaged with the locking groove 604 on the side wall of the connecting block 303. When the locking block 603 and the locking groove 604 are engaged, the stability of the gear rod 4 on the connecting block 303 is ensured.

[0034] When it is necessary to lock the connecting block 303, rotate the screw 601. Since the screw 601 is threadedly connected to the slider 602, and the slider 602 can only move linearly under the limiting action of the inner wall of the slide rail bracket 6, the rotation of the screw 601 will cause the slider 602 to move along the axial direction of the screw 601. When the slider 602 moves, it drives the locking block 603 fixed at one end to move. When the locking block 603 moves to the position corresponding to the locking groove 604 on the side wall of the connecting block 303, continue to rotate the screw 601 so that the locking block 603 is engaged in the locking groove 604, thereby locking the connecting block 303 and ensuring the stability of the gear rod 4 on the connecting block 303. When it is necessary to unlock, rotate the screw 601 in the opposite direction so that the slider 602 drives the locking block 603 to exit from the locking groove 604, thereby releasing the locking of the connecting block 303.

[0035] The locking block 603 and the locking groove 604 are engaged to effectively fix the connecting block 303 and prevent the connecting block 303 from moving due to pressure fluctuations of the hydraulic rod 302 or other factors. This ensures stable meshing of the gear rod 4 and the ring gear 404. Through rigid locking, it effectively resists the high pressure during the injection molding process, prevents core displacement, and ensures the molding accuracy of precision structures such as threads. The hydraulic rod 302 does not need to maintain pressure continuously and only needs to be activated when pulling the core, saving energy and shortening the action time. The locking and unlocking operations can be achieved by rotating the screw 601, which is simple, convenient and easy to control.

[0036] One end of the screw 601 is fixed with a nut, which can be operated with a wrench, making the operation simple and convenient.

[0037] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0038] After injection molding, when core pulling is required, first rotate the screw 601 in the opposite direction. The slider 602 drives the locking block 603 to exit from the locking groove 604, releasing the locking of the connecting block 303. Then, the hydraulic rod 302 is activated. Under the fixed support of the fixed rod 301, its telescopic end drives the connecting block 303 to move linearly. The connecting block 303 drives the gear rod 4 to move. Since the gear rod 4 is meshed with the ring gear 404, and the ring gear 404 can only rotate under the guidance of the guide rod 403, the linear movement of the gear rod 4 will cause the ring gear 404 to rotate around the guide rod 403. When the ring gear 404 rotates, it drives the rotating block 5 fixed on its upper end to rotate, which in turn drives the insert block 501 to rotate, thus realizing the core pulling action.

[0039] After the core pulling is completed, the material removal operation can be performed. When the mold is closed, the hydraulic rod 302 moves in the reverse direction, driving the gear rod 4 to move in the reverse direction, causing the ring gear 404 to rotate in the reverse direction, and the insert block 501 is reset accordingly. When the connecting block 303 moves into place, the screw 601 is rotated, causing the slider 602 to drive the locking block 603 to engage in the locking groove 604, thereby locking the connecting block 303 and ensuring the stability of the gear rod 4 on the connecting block 303, preparing for the next injection molding.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary guide core-pulling structure for shortening the injection molding cycle, comprising a bottom mold body (1), characterized in that: The bottom mold body (1) is provided with a guide core pulling mechanism for injection molds. The guide core pulling mechanism includes: a rotating component, including a fixing block (3) provided on the side wall of the bottom mold body (1), a connecting block (303) connected by a telescopic component on one side of the fixing block (3), a gear rod (4) fixed on one side of the connecting block (303), a support block (401) fixed inside the bottom mold body (1), and a ring gear (404) connected by a guide component at the upper end of the support block (401); and a locking component, including a locking groove (604) opened on one side of the connecting block (303), a slide rail bracket (6) fixed on the upper end face of the fixing block (3), and a locking block (603) connected by a push component inside the slide rail bracket (6).

2. The rotary guide core-pulling structure for shortening the injection molding cycle according to claim 1, characterized in that: The upper end of the bottom mold body (1) is provided with an upper mold body (2), and the upper end of the upper mold body (2) is provided with an injection port for feeding material.

3. The rotary guide core-pulling structure for shortening the injection molding cycle according to claim 1, characterized in that: The telescopic assembly includes a fixing rod (301) fixed to one side wall of a fixing block (3), a hydraulic rod (302) fixed to one end of the fixing rod (301), and a connecting block (303) fixedly connected to the telescopic end of the hydraulic rod (302).

4. The rotary guide core-pulling structure for shortening the injection molding cycle according to claim 1, characterized in that: The guide assembly includes a fixing plate (402) fixed to one side of the upper end of the support block (401), a guide rod (403) fixed to the inner wall of the fixing plate (402), a ring gear (404) located on the outer wall of the guide rod (403), the ring gear (404) and the guide rod (403) being slidably connected, the ring gear (404) and the gear rod (4) being meshed, and a guide plate (7) for the gear rod (4) to slide against the edge of the support block (401).

5. The rotary guide core-pulling structure for shortening the injection molding cycle according to claim 1, characterized in that: The upper end of the ring gear (404) is fixed with a rotating block (5), and the upper end of the rotating block (5) is fixed with an insert block (501).

6. The rotary guide core-pulling structure for shortening the injection molding cycle according to claim 1, characterized in that: The jacking assembly includes a screw (601) rotatably connected inside the slide rail bracket (6), a slider (602) slidably connected to the inner wall of the slide rail bracket (6), the slider (602) being threadedly connected to the screw (601), a locking block (603) being fixedly connected to one end of the slider (602), and the locking block (603) being engaged with the locking groove (604) on the side wall of the connecting block (303).

Images