A core-pulling device for injection molds

Abstract

This utility model relates to the field of injection mold technology, specifically to a core-pulling device for injection molds. It includes a frame, on which an upper mold is slidably mounted, and a lower mold is fixedly mounted. A sliding groove is formed within the lower mold, and a core-pulling device is located within it. A driving mechanism is mounted on the frame. The driving mechanism includes a branch pipe fixedly mounted on the frame and a main pipe fixedly mounted on the branch pipe. A connecting rod is slidably mounted within the main pipe, and a piston is fixedly mounted at the lower end of the connecting rod. The upper end of the connecting rod is fixedly connected to the side of the upper mold. A fixing frame is fixedly mounted within the branch pipe, and a pusher is slidably sleeved on the fixing frame. The core-pulling device is driven directly by the mold-opening force of the injection molding machine. The ejection force during mold opening propels hydraulic oil from the main pipe into the branch pipe via the sliding rod and piston, and the pusher pushes the push rod and locking rod to move the core-pulling device, effectively eliminating the need for an electrical or hydraulic system.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold core-pulling device. Background Technology

[0002] Injection molding is a method of shaping industrial products. Products are usually made using rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding compression molding and die casting. Injection molding machines are the main molding equipment that uses plastic molds to make plastic products of various shapes from thermoplastic or thermosetting materials. Injection molding is achieved through injection molding machines and molds. At the end of the molding cycle, a core-pulling action is usually required to complete the ejection of the product.

[0003] Traditional core-pulling techniques typically involve integrating an independent drive mechanism, such as an electric cylinder, inside the mold. While this method achieves the core-pulling purpose, the addition of extra drive components significantly increases the complexity of mold design and the difficulty of internal layout. The purchase, installation, and maintenance costs of the independent drive mechanism directly increase the overall manufacturing cost of the mold. Furthermore, the powerful ejection forces provided by the injection molding machine itself, such as mold opening force and ejection force, are not effectively utilized in this process, resulting in a waste of power resources. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a core-pulling device for injection molds, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a core-pulling device for injection molds, comprising a frame, an upper mold slidably mounted on the frame, a lower mold fixedly mounted on the frame, a sliding groove provided in the lower mold, a core-pulling device provided in the lower mold, and a driving mechanism provided on the frame;

[0008] The drive mechanism includes a branch pipe fixedly installed on the frame and a main pipe fixedly installed on the branch pipe. A connecting rod is slidably installed inside the main pipe, and a piston is fixedly installed at the lower end of the connecting rod. The piston fits against the inner wall of the main pipe, and the upper end of the connecting rod is fixedly connected to the side of the upper mold. A fixed frame is fixedly installed inside the branch pipe, and a push plug is slidably sleeved on the fixed frame. A push rod is slidably installed at the end of the branch pipe away from the main pipe, and the push rod is fixedly connected to the push plug. The core pulling device includes a slide frame slidably installed inside the lower mold. Slide rods are fixedly installed on both sets of slide frames. The slide rods are correspondingly set with slide grooves, and the slide rods are slidably connected to the lower mold through the slide grooves.

[0009] Preferably, two sets of symmetrically distributed sliders are fixedly installed on the pusher, and the pusher is slidably connected to the branch pipe through the sliders.

[0010] Preferably, two sets of symmetrically distributed first springs are movably sleeved on the fixing frame, and the two ends of the two sets of first springs are respectively fixedly connected to the push plug and the fixing frame.

[0011] Preferably, a second spring is sleeved on the slide, and the two ends of the second spring are fixedly connected to the slide rod and the lower mold, respectively.

[0012] Preferably, racks are fixedly installed on both sets of slides, and gears are provided between the two sets of racks. The gears mesh with the two sets of racks respectively. Two sets of symmetrically distributed fixing rods are fixedly installed in the lower mold. The two sets of racks are correspondingly arranged with the fixing rods. A locking rod is fixedly installed on the inner rack, and the locking rod is fixedly connected to the end of the push rod away from the push plug.

[0013] Preferably, the gear is rotatably connected to the lower mold via a mounting shaft, and two sets of symmetrically distributed torsion springs are sleeved on the mounting shaft. The two ends of the two sets of torsion springs are respectively fixedly connected to the gear and the lower mold.

[0014] Preferably, the rack is slidably sleeved with the corresponding fixed rod, and two sets of symmetrically distributed third springs are sleeved on the fixed rod, with the two ends of the two sets of third springs respectively fixedly connected to the rack and the lower mold.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a core-pulling device for injection molds, which has the following beneficial effects:

[0017] Traditional core-pulling requires an additional electric or hydraulic cylinder, while this device directly utilizes the injection molding machine's mold-opening force to drive the core-pulling mechanism through a linkage mechanism (main pipe-piston-connecting rod-push rod). The drive mechanism is integrated into the frame and mold sidewall, eliminating the need to reserve drive space inside the mold. This solves the layout congestion problem caused by independent drive components in traditional solutions. The ejection force during mold opening of the injection molding machine pushes the hydraulic oil in the main pipe into the branch pipe through the slide rod and piston, and pushes the push rod and clamp rod through the push plug to push the core-pulling device. This effectively saves the cost of electrical or hydraulic systems (such as sensors, oil circuits, etc.). Furthermore, the gear-rack transmission mechanism and spring reset structure (second spring, third spring) use standardized parts, resulting in lower processing and maintenance costs. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the lower mold of this utility model;

[0021] Figure 3 This is a schematic diagram of the branch pipe of this utility model;

[0022] Figure 4 This is a schematic diagram of the drive mechanism of this utility model;

[0023] Figure 5 This is a schematic diagram of the core-pulling mechanism of this utility model.

[0024] In the diagram: 1. Frame; 2. Lower mold; 3. Drive mechanism; 301. Main pipe; 302. Connecting rod; 303. Piston; 304. Branch pipe; 305. Fixing frame; 306. Push plug; 307. Slider; 308. First spring; 309. Push rod; 310. Retaining ring; 4. Slide groove; 5. Core pulling mechanism; 501. Slide frame; 502. Slide rod; 503. Second spring; 504. Rack; 505. Gear; 506. Mounting shaft; 507. Torsion spring; 508. Fixing rod; 509. Third spring; 510. Clamping rod; 6. Upper mold. Detailed Implementation

[0025] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0026] Figures 1-5In one embodiment of this utility model, a core-pulling device for injection molds includes a frame 1, an upper mold 6 slidably mounted on the frame 1, a lower mold 2 fixedly mounted on the frame 1, a groove 4 formed in the lower mold 2, a core-pulling mechanism 5 provided in the lower mold 2, and a driving device on the frame 1. The driving device includes a branch pipe 304 fixedly mounted on the frame 1 and a main pipe 301 fixedly mounted on the branch pipe 304. A connecting rod 302 is slidably mounted in the main pipe 301. A piston 303 is fixedly installed at the lower end, and the piston 303 is in contact with the inner wall of the main pipe 301. The upper end of the connecting rod 302 is fixedly connected to the side of the upper mold 6. A fixing bracket 305 is fixedly installed inside the branch pipe 304, and a pusher 306 is slidably sleeved on the fixing bracket 305. A push rod 309 is slidably installed at the end of the branch pipe 304 away from the main pipe 301, and the push rod 309 is fixedly connected to the pusher 306. The core-pulling mechanism 5 includes a slide 501 slidably installed in the lower mold 2, and two sets of slides 501. Each mold 1 is fixedly equipped with a slide rod 502, which corresponds to the slide groove 4. The slide rod 502 is slidably connected to the lower mold 2 through the slide groove 4. Traditional core pulling requires an additional electric cylinder or hydraulic cylinder. However, this device directly uses the mold opening force of the injection molding machine to drive the core pulling through the linkage mechanism main pipe 301-piston 303-connecting rod 302-push rod 309. The drive device is integrated into the frame 1 and the mold side wall, eliminating the need to reserve drive space inside the mold. This solves the problem of layout issues caused by independent drive components in traditional solutions. To address the issue of congestion, the ejection force during mold opening of the injection molding machine propels the hydraulic oil in the main pipe 301 into the branch pipe 304 via the slide rod 502 and piston 303. This, in turn, pushes the push rod 309 and the locking rod 510 via the push plug 306, thereby driving the core-pulling mechanism 5. This effectively eliminates the cost of electrical or hydraulic systems such as sensors and oil circuits. Furthermore, the gear 505-rack 504 transmission mechanism and the spring reset structure, including the second spring 503 and the third spring 509, use standardized parts, resulting in lower processing and maintenance costs.

[0027] In this embodiment, reference Figure 3 , Figure 4As shown, two sets of symmetrically distributed sliders 307 are fixedly installed on the pusher 306, and the pusher 306 is slidably connected to the branch pipe 304 through the sliders 307. Two sets of symmetrically distributed first springs 308 are movably sleeved on the fixed frame 305. The two ends of the two sets of first springs 308 are fixedly connected to the pusher 306 and the fixed frame 305 respectively. A second spring 503 is sleeved on the slide 501, and the two ends of the second spring 503 are fixedly connected to the slide rod 502 and the lower mold 2 respectively. When the mold is closed, the upper mold 6 and the lower mold 2 are pressed together to form a cavity. The drive device is in a compressed state. The connecting rod 302 drives the piston 303 to be at the bottom of the main pipe 301. The push rod 309 is constrained by the fixed frame 305. The pusher 306 compresses the first spring 308. The rack 504 retracts under the action of the third spring 509. The gear 505 is kept neutral by the preload of the torsion spring 507. The slide 501 drives the slide rod 502 to stick tightly to the cavity wall. The injection molding machine drives the upper mold 6 to move vertically upward, and the connecting rod 302 is lifted simultaneously. The piston 303 in the main pipe 301 and the branch pipe 304 are filled with hydraulic oil. Therefore, during the process of the connecting rod 302 driving the piston 303 to move upward, the hydraulic oil is further squeezed into the branch pipe 304. The hydraulic oil pushes the pusher 306 to slide along the branch pipe 304 through the slider 307 and releases the elastic force of the first spring 308, which in turn helps the pusher rod 309 to extend horizontally.

[0028] In this embodiment, reference Figure 5As shown, racks 504 are fixedly installed on both sets of slides 501, and gears 505 are provided between the two sets of racks 504. The gears 505 mesh with the two sets of racks 504 respectively. Two sets of symmetrically distributed fixing rods 508 are fixedly installed inside the lower mold 2. The two sets of racks 504 are correspondingly arranged with the fixing rods 508. A locking rod 510 is fixedly installed on the inner rack 504, and the locking rod 510 is fixedly connected to the end of the push rod 309 away from the push plug 306. The gears 505 and 506 are fixedly connected to the inner rack 504. 5. The mounting shaft 506 is rotatably connected to the lower mold 2. Two sets of symmetrically distributed torsion springs 507 are sleeved on the mounting shaft 506. The two ends of the two sets of torsion springs 507 are fixedly connected to the gear 505 and the lower mold 2, respectively. The rack 504 is slidably sleeved with the corresponding fixing rod 508, and two sets of symmetrically distributed third springs 509 are sleeved on the fixing rod 508. The two ends of the two sets of third springs 509 are fixedly connected to the rack 504 and the lower mold 2, respectively. Push rod 3 The end of 09 is rigidly connected to the inner rack 504 via the locking rod 510, pushing the rack 504 outward. The gear 505 and rack 504 move in a two-way linkage. The outward movement of the inner rack 504 drives the gear 505 to rotate. The gear 505 meshes with the outer rack 504 and moves outward in the opposite direction, realizing the synchronous back-to-back movement of the two side slides 501. The slide 501 drives the slide rod 502 to slide horizontally outward along the slide groove 4 of the lower mold 2, disengaging from the side hole / groove of the plastic part. The second spring 503 counteracts the inertia of the slide 501. Vibration occurs when the fixed rod 508 constrains the trajectory of the rack 504 to prevent skewing. When the mold is closed, the upper mold 6 is pressed down, the connecting rod 302 pushes the piston 303 to move down, and the first spring 308 on the fixed frame 305 pushes the push plug 306 and the push rod 309 to return to their original positions. The push rod 309 pulls the rack 504 back through the locking rod 510. The gear 505 rotates in the opposite direction under the action of the torsion spring 507, driving the racks 504 on both sides to reset. The slide 501 is assisted in returning to its original position by the third spring 509.

[0029] In this embodiment, when the mold is closed, the upper mold 6 and the lower mold 2 press together to form a cavity. The drive device is in a compressed state. The connecting rod 302 drives the piston 303 to the bottom of the main pipe 301. The push rod 309 is constrained by the fixed frame 305. The push plug 306 compresses the first spring 308. The rack 504 retracts under the action of the third spring 509. The gear 505 is kept neutral by the preload of the torsion spring 507. The slide 501 drives the slide rod 502 to stick tightly to the cavity wall. The injection molding machine drives the upper mold 6 to move vertically upward, and the connecting rod 302 lifts synchronously. Hydraulic oil is filled above the piston 303 in the main pipe 301 and in the branch pipe 304. Therefore, during the upward movement of the piston 303 driven by the connecting rod 302, the hydraulic oil is further squeezed into the branch pipe 304. The hydraulic oil pushes the pusher plug 306 through the slider 307 along the branch pipe 304 and releases the elastic force of the first spring 308, which in turn helps the push rod 309 extend horizontally. The end of the push rod 309 is rigidly connected to the inner rack 504 through the locking rod 510, pushing the rack 504 outward. The gear 505 and rack 504 move in a two-way linkage; the outward movement of the inner rack 504 drives the gear 505 to rotate, and the gear 505 meshes with the outer gear. The slide 504 moves outward in the opposite direction, realizing the synchronous back-to-back movement of the two slides 501. The slide 501 drives the slide rod 502 to slide horizontally outward along the slide groove 4 of the lower mold 2, disengaging from the side hole / groove of the plastic part. The second spring 503 counteracts the inertial vibration of the slide 501, and the fixing rod 508 constrains the trajectory of the rack 504 to avoid deflection. When the mold is closed, the upper mold 6 is pressed down, the connecting rod 302 pushes the piston 303 to move down, and the first spring 308 on the fixing frame 305 pushes the push plug 306 and the push rod 309 to return to their original positions. The push rod 309 pulls back the rack 504 through the locking rod 510. The gear 505 rotates in the opposite direction under the action of the torsion spring 507, driving the racks 504 on both sides to reset. The slide 501 is assisted in returning to its original position by the third spring 509.

[0030] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0031] It should be noted that 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.

[0032] 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. An injection mold core-pulling device comprising a frame (1), characterized in that: The upper mold (6) is slidably installed on the frame (1), and the lower mold (2) is fixedly installed on the frame (1). The lower mold (2) has a sliding groove (4) and a core pulling mechanism (5). The frame (1) is equipped with a driving device. The driving device includes a branch pipe (304) fixedly installed on the frame (1) and a main pipe (301) fixedly installed on the branch pipe (304). A connecting rod (302) is slidably installed inside the main pipe (301), and a piston (303) is fixedly installed at the lower end of the connecting rod (302). The piston (303) is in contact with the inner wall of the main pipe (301), and the upper end of the connecting rod (302) is fixedly connected to the side of the upper mold (6). A fixing frame (305) is fixedly installed inside the branch pipe (304), and a pusher (306) is slidably sleeved on the fixing frame (305). 304) A push rod (309) is slidably installed at one end away from the main pipe (301), and the push rod (309) is fixedly connected to the push plug (306). The core pulling mechanism (5) includes a slide (501) slidably installed in the lower mold (2). A slide rod (502) is fixedly installed on both slides (501). The slide rod (502) is correspondingly set with the slide groove (4), and the slide rod (502) is slidably connected to the lower mold (2) through the slide groove (4). A retaining ring (310) is fixedly installed in the branch pipe (304), and the push plug (306) is movably engaged with the retaining ring (310).

2. A core-pulling device for injection molds according to claim 1, characterized in that: Two sets of symmetrically distributed sliders (307) are fixedly installed on the pusher (306), and the pusher (306) is slidably connected to the branch pipe (304) through the sliders (307).

3. A core-pulling device for injection molds according to claim 1, characterized in that: Two sets of symmetrically distributed first springs (308) are movably sleeved on the fixed frame (305), and the two ends of the two sets of first springs (308) are fixedly connected to the push plug (306) and the fixed frame (305) respectively.

4. An injection mold core pulling apparatus as defined in claim 1 wherein: A second spring (503) is sleeved on the slide (501), and the two ends of the second spring (503) are fixedly connected to the slide rod (502) and the lower mold (2) respectively.

5. An injection mold core pulling apparatus as defined in claim 1 wherein: Both sets of slides (501) are fixedly mounted with racks (504), and gears (505) are provided between the two sets of racks (504). The gears (505) mesh with the two sets of racks (504) respectively. Two sets of symmetrically distributed fixing rods (508) are fixedly mounted in the lower mold (2). The two sets of racks (504) are correspondingly set with the fixing rods (508). A locking rod (510) is fixedly mounted on the inner rack (504), and the locking rod (510) is fixedly connected to the end of the push rod (309) away from the push plug (306).

6. The injection mold core-pulling device according to claim 5, characterized in that: The gear (505) is rotatably connected to the lower mold (2) via the mounting shaft (506). Two sets of symmetrically distributed torsion springs (507) are sleeved on the mounting shaft (506). The two ends of the two sets of torsion springs (507) are fixedly connected to the gear (505) and the lower mold (2) respectively.

7. An injection mold core pulling apparatus as defined in claim 5 wherein: The rack (504) is slidably sleeved with the corresponding fixed rod (508), and two sets of symmetrically distributed third springs (509) are sleeved on the fixed rod (508). The two ends of the two sets of third springs (509) are respectively fixedly connected to the rack (504) and the lower mold (2).

Images