Inner core-pulling demoulding device

Abstract

The utility model provides an inner core-pulling demoulding device. The inner core-pulling demoulding device comprises a push plate mechanism, a core column main body, a locking mechanism and a driving mechanism, the core column body is provided with a center channel arranged in the axial direction of the core column body and a first through hole communicated with the center channel. The locking mechanism comprises an inner pulling sliding block driving piece and an inner pulling sliding block. The inner pulling sliding block driving piece is installed in the center channel and can slide in the axial direction of the center channel. The inner pulling sliding block is installed in the first through hole and can slide in the first through hole, and one end of the inner pulling sliding block driving piece is matched with the locking mechanism. According to the inner core-pulling demolding device provided by the utility model, the position of a product is locked through the locking mechanism, the locking is unlocked after the product is formed, and the product is pushed out through the push plate mechanism; the inner core-pulling demolding device solves the problem that a traditional inner core-pulling demolding device is too long, and has the advantages of being small in size, simplified in mold structure and low in mold cost. By changing the locking and ejecting modes of the product, an oil cylinder driving long core pulling structure in the traditional technology is eliminated, and the size of the mold is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to an inner core-pulling demoulding device. Background Art

[0002] The internal core-pulling demolding device is suitable for demolding products with long cylindrical shells. It includes a core body. The product is first molded over the core body and then released from the core body to complete the demolding process. Conventionally, products with long cylindrical shells require a slender core body to support the internal structure. This means that the slender core body must be completely pulled out of the product before demolding to facilitate product removal.

[0003] The existing technology often uses a cylinder or an angle pin in combination with a cylinder to drive the core column body to be pulled out of the product, but these two structures have the following defects: 1. The unit price of a long-stroke cylinder is higher than that of a short-stroke cylinder; 2. The mold needs to be enlarged to follow the shape of the core column body, at least larger than the length of the product plus the core column body, which makes it difficult to match the injection molding machine; 3. The operation steps are complicated. After the injection molding is completed, the core column body needs to be completely withdrawn from the product before the product can be ejected; 4. Since the head of the core column body is long and thin, in order to prevent the core column body from colliding with the cantilever beam, the length and thickness of the core column seat must also be increased accordingly, resulting in the corresponding mold also having to be enlarged and thickened to ensure that there is enough space to meet the movement of the core column body and the strength of the mold itself. The enlargement and thickening of the mold requires matching a larger tonnage injection molding machine during injection molding production, resulting in matching difficulties; 5. The place where the core column body contacts the product is difficult to cool, and the product is prone to defects; 6. The existing technology cannot be applied to the situation where a snap is provided on the inside of the product, and the core column body lacks a structure that cooperates with the snap.

[0004] Therefore, cylindrical products with undercut inner walls need to rely on a long-distance core-pulling mechanism to securely place the product. However, the long-distance core-pulling structure has a significant impact on the size of the mold frame, the ability to withstand lateral injection pressure, and the ability to adjust the mold temperature.

[0005] In the above situation, there is an urgent need for an internal core-pulling demoulding device that can reduce the moving distance of the core column body, reduce the size of the core column body and the mold, simplify the product ejection steps, is suitable for situations where there are buckles on the inside of the product, and can fully cool the center core column. Utility Model Content

[0006] In light of this, the purpose of this utility model is to provide an internal core-pulling demoulding device that locks the product in place through a locking mechanism. Once the product is formed, the lock is released and the product is ejected through a push-plate mechanism. This device solves the problem of excessive length in conventional internal core-pulling demoulding devices, offering advantages such as a compact size, simplified mold structure, and reduced mold costs. By changing the method of locking and ejecting the product, the traditional long cylinder-driven core-pulling structure is eliminated, reducing mold size.

[0007] The utility model provides an inner core-pulling demoulding device for separating a product from a mold, comprising a push plate mechanism, a core column body, a locking mechanism and a driving mechanism;

[0008] The core column body is provided with a central channel arranged along its axial direction and a first through hole communicating with the central channel;

[0009] The locking mechanism includes an inner-drawing slider driver and an inner-drawing slider; the inner-drawing slider driver is installed in the central channel and can slide along the axial direction thereof; the inner-drawing slider is installed in the first through hole and can slide in the first through hole, and one end of the inner-drawing slider driver is engaged with the inner-drawing slider;

[0010] The driving mechanism cooperates with the other end of the inner-extraction slider driving member and is used to drive the inner-extraction slider driving member to move axially along the stem body in the central channel, so as to drive the inner-extraction slider to extend from the first through hole to the outer wall of the stem body or to retract into the stem body;

[0011] The push plate mechanism is sleeved on the core column body and can move on the core column body along the axial direction of the core column body to push the formed product away from the core column body.

[0012] Specifically, the driving mechanism includes an inclined guide column, and the end of the inner-pullout slider driving member away from the inner-pullout slider is provided with an inclined guide hole that cooperates with the inclined guide column; the moving direction of the inclined guide column is perpendicular to the axial direction of the core column body, and when the inclined guide column slides in the inclined guide hole, it can drive the inner-pullout slider driving member to move synchronously along the axial direction of the core column body.

[0013] Specifically, the driving mechanism also includes a locking member fixedly connected to one end of the inclined guide column away from the inward-pullout slider driving member, and the locking member is provided with a protrusion. When the inclined guide column is inserted into the inclined guide hole to a preset position, the protrusion is configured to press the end face of the inward-pullout slider driving member and to limit the moving position of the inward-pullout slider driving member.

[0014] Specifically, an inclined groove is provided on the side of the inner-pull-out slider driving member, the bottom of the inner-pull-out slider is mounted on the inclined groove and slides along the inclined groove, and the side of the inner-pull-out slider abuts against the hole wall of the first through hole and is used to limit the movement of the inner-pull-out slider in the opening direction of the first through hole to extend out of the outer wall of the core column body or retract into the core column body.

[0015] Specifically, the inner core-pulling demoulding device also includes a wear-resistant plate, which is arranged on the inner wall of the central channel to reduce the friction force encountered by the inner core-pulling slider driver during movement and guide the moving direction of the inner core-pulling slider driver.

[0016] Specifically, the inner core-pulling demolding device also includes a stop member and a shifting ball arranged on the inner wall of the central channel. The stop member is used to limit the moving range of the inner pull-out slider driving member. When the inner pull-out slider driving member abuts against the stop member, the shifting ball pops out and engages with the inner pull-out slider driving member to limit the position of the inner pull-out slider driving member.

[0017] Specifically, the core column body is further provided with a second through hole, and the first through hole and the second through hole are respectively located on the side walls at both ends of the core column body; the driving mechanism passes through the second through hole and cooperates with the other end of the inner sliding block driving member.

[0018] Specifically, a locking groove is provided on the inner wall of the central channel, and the opening of the locking groove faces the second through hole; the driving mechanism passes through the second through hole and cooperates with the inward-pull-out slider driving member and is inserted into the locking groove, and the driving mechanism and the inward-pull-out slider driving member are limited by the locking groove together.

[0019] Specifically, a cooling circuit is provided in the core column body, and the cooling circuit includes a liquid inlet line and a liquid outlet line. The liquid inlet line and the liquid outlet line are axially arranged on both sides of the axis of the core column body, and are intertwined and wound at one end of the core column body close to the product to form a spiral structure for increasing the cooling contact area.

[0020] Specifically, the push plate mechanism includes a push plate seat and an ejector block. The push plate seat is provided with a third through hole that cooperates with the core column body. The ejector block is arranged on the side of the push plate seat facing the product. The ejector block is fixedly arranged next to the third through hole for ejecting the formed product.

[0021] In summary, the internal core-pulling demolding device of this utility model locks the product in place through a locking mechanism. After the product is formed, the lock is released and the product is ejected through a push plate mechanism. This solves the problem of the excessive length of traditional internal core-pulling demolding devices, and has the advantages of being compact, simplifying the mold structure, and reducing mold costs. By changing the method of locking and ejecting the product, the traditional technology's long hydraulic cylinder-driven core-pulling structure is eliminated, reducing the mold size.

[0022] Optionally, a wear-resistant plate is added to the inner wall of the central channel. The shape of the wear-resistant plate can guide the movement direction of the inner-pull-out slider driver, and can also achieve the effect of reducing friction and smooth movement, avoiding wear caused by direct contact between the inner-pull-out slider driver and the core column body.

[0023] Optionally, a stopper and a shifting ball are provided on the inner wall of the central channel to limit the inner pull-out slider driving member to a preset position, so as to avoid the problem that the inner pull-out slider driving member shakes when the product is demolded, causing the inner pull-out slider to suddenly extend and scratch the inside of the product. It can also prevent the inner pull-out slider driving member from generating flash due to the retreat of the injection pressure.

[0024] Optionally, the stem body is further provided with a second through hole, and a locking groove is provided on the inner wall of the central channel. The driving mechanism passes through the second through hole and is inserted into the locking groove after cooperating with the inner-drawing slider driving member. The driving mechanism and the inner-drawing slider driving member are both restrained by the locking groove, thereby fixing the positions of the inner-drawing slider driving member and the inner-drawing slider.

[0025] Optionally, a cooling circuit comprising an inlet and outlet line is provided within the core body. The inlet and outlet lines are axially arranged on either side of the core body axis and intertwined to form a spiral structure at the end of the core body closest to the product. This increases the cooling contact area and fully cools the core body. This can effectively improve the ability to withstand lateral injection pressure and regulate mold temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is one of the structural schematic diagrams of the inner core-pulling demoulding device in the first embodiment of the present utility model;

[0028] Figure 2 This is an exploded view of the structure of the inner core-pulling demoulding device in the first embodiment of the present utility model;

[0029] Figure 3 It is a side sectional schematic diagram of the main structure of the inner core-pulling demoulding device in the first embodiment of the present utility model;

[0030] Figure 4 This is a schematic plan view of the structure of the inner core-pulling demoulding device in the first embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of the planar cross-sectional structure of the inner core-pulling demoulding device in the first embodiment of the present utility model;

[0032] Figure 6 This is the second structural diagram of the inner core-pulling demoulding device in the first embodiment of the present utility model;

[0033] Figure 7 It is a side sectional schematic diagram of the initial state of the inner core-pulling demoulding device in the first embodiment of the present utility model;

[0034] Figure 8 for Figure 7 A partial enlarged view of area A in the middle;

[0035] Figure 9 for Figure 7 A partial enlarged view of the middle B area;

[0036] Figure 10 It is a side sectional schematic diagram of the inner core-pulling demoulding device in the first embodiment of the present utility model in the demoulding state;

[0037] Figure 11 It is a side sectional schematic diagram of the inner core-pulling demoulding device in the first embodiment of the present utility model after demoulding;

[0038] Figure 12 This is a schematic structural diagram of the inner core-pulling demoulding device in the second embodiment of the present utility model.

[0039] The reference numerals of the embodiments of the present invention in the above drawings are as follows:

[0040] 110, first mold; 120, second mold; 130, product;

[0041] 200 push plate mechanism; 210, push plate seat; 220, push plate seat guide pillar; 230, ejector block; 240, slider; 250, reset member;

[0042] 310, stem body; 311, central channel; 312, first through hole; 313, second through hole; 314, locking groove; 320, stem seat; 330, stem seat guide;

[0043] 400, locking mechanism; 410, inner slide driver; 411, oblique guide hole; 420, inner slide; 430, mounting seat;

[0044] 500, driving mechanism; 510, inclined guide column; 520, anti-locking member; 521, protruding portion;

[0045] 610, wear-resistant plate; 620, stopper; 630, shifting bead;

[0046] 700, cooling circuit; 710, spiral structure;

[0047] 800, ejector guide block; 810, inclined sliding hole; 820, straight sliding hole. DETAILED DESCRIPTION

[0048] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the description of the present invention, all other embodiments derived by persons of ordinary skill in the art without inventive effort are also within the scope of protection of the present invention.

[0049] In the description of this utility model, unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0050] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the utility model.

[0051] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature and do not indicate or imply relative importance or a particular order.

[0052] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0053] The following is a detailed description through specific embodiments.

[0054] First embodiment

[0055] like Figures 1 to 3 As shown, the first embodiment of the present invention provides an inner core-pulling demoulding device for separating a product 130 from a mold, comprising a push plate mechanism 200, a core column body 310, a locking mechanism 400 and a driving mechanism 500;

[0056] The stem body 310 is provided with a central passage 311 arranged along its axial direction and a first through hole 312 communicating with the central passage 311;

[0057] Specifically, such as Figure 2 As shown, the core body 310 is in the shape of a cylinder, and the outer surface is a contoured surface that matches the inner side of the product 130, and is used for the product 130 to be manufactured and formed thereon. There are two first through holes 312, which are distributed on opposite sides. Figure 8 and Figure 9 As shown, the central channel 311 refers to a long strip-shaped cavity provided in the core column body 310 and distributed along the axial direction thereof.

[0058] The locking mechanism 400 includes an inner slide driver 410 and an inner slide 420. The inner slide driver 410 is mounted in the central channel 311 and is slidable along the central channel 311. The inner slide 420 is mounted in the first through hole 312 and is slidable within the first through hole 312. One end of the inner slide driver 410 engages with the inner slide 420.

[0059] Specifically, the inner slide driver 410 is strip-shaped. In this embodiment, since there are two first through-holes 312 and they are symmetrically distributed along the axial direction, the number of inner slides 420 is also set to two. Correspondingly, the inner slide driver 410 is shaped like a long strip, and the two side surfaces at one end of the inner slide driver 410 mate with the inner slide 420. The formed product 130 is sleeved onto the core body 310, completely enveloping one end thereof, with the inner side surface of the product 130 partially or completely covering the first through-hole 312.

[0060] The driving mechanism 500 cooperates with the other end of the inner-drawing slider driving member 410 and is used to drive the inner-drawing slider driving member 410 to move axially along the stem body 310 within the central channel 311, thereby driving the inner-drawing slider 420 to extend from the outer wall of the stem body 310 through the first through hole 312 or retract into the stem body 310;

[0061] Specifically, when the inner slide 420 extends out of the outer wall of the stem body 310, it is designed to fit against the inner side surface of the molded product 130. The inner slide 420 engages with the inner side surface of the molded product 130 to fix the position of the molded product 130 and fix it on the stem body 310 to prevent it from falling off. When the inner slide 420 is retracted into the stem body 310, the inner slide 420 is released from the inner side surface of the molded product 130, and the molded product 130 can be separated from the stem body 310. The portion of the inner slide 420 that extends out of the outer wall of the stem body 310 is provided with a snap-fit ​​structure on the inner wall of the molded product 130, and the two abut and cooperate to connect the molded product 130 to the inner slide 420.

[0062] When moving, the inner slide driver 410 does not need to be fully withdrawn from the product 130; it only needs to be withdrawn a short distance to ensure that the inner slide 420 is retracted into the core body 310. The inner slide 420 is inserted into the center channel 311 to a fixed depth and moves radially. Compared with the existing technology, the travel distance of the inner slide driver 410 is reduced. The inner slide 420 is a simplified conventional slide 240 structure, eliminating the cylinder drive, simplifying the overall structure of the inner core demolding device and reducing mold costs.

[0063] The push plate mechanism 200 is sleeved on the core column body 310 and can move on the core column body 310 along the axial direction of the core column body 310 to push the formed product 130 away from the core column body 310 .

[0064] Specifically, this embodiment changes the ejection method of the molded product 130, eliminating the ejector plate ejection system of the prior art and replacing it with a push plate mechanism 200. The push plate mechanism 200 is arranged to face the tail of the product 130 and is used to push the molded product 130 away from the core column body 310 from the tail. The thickness of the push plate mechanism 200 only needs to be greater than the diameter of the core column body 310 to ensure that it can abut the tail of the product 130. This design can significantly reduce the thickness of the internal core pulling demolding device and the mold, reduce the demand for large-tonnage injection molding machines, and reduce the cost of using injection molding machines. At the same time, it allows the residence time to effectively meet material requirements, reduces the risk of degradation and carbonization, and improves the quality of the product 130.

[0065] like Figure 3 As shown, in this embodiment, the driving mechanism 500 includes an inclined guide column 510, and an inclined guide hole 411 that cooperates with the inclined guide column 510 is provided at the end of the inner-pull-out slider driving member 410 away from the inner-pull-out slider 420; the moving direction of the inclined guide column 510 is perpendicular to the axial direction of the core column body 310. When the inclined guide column 510 slides in the inclined guide hole 411, it can drive the inner-pull-out slider driving member 410 to move synchronously along the axial direction of the core column body 310.

[0066] Specifically, the direction of the column body of the inclined guide column 510 is parallel to the direction of the inclined guide hole 411, and both are at an angle to the axial direction of the core column body 310. During the movement of the inclined guide column 510, the column body of the inclined guide column 510 squeezes the hole wall of the inclined guide hole 411, and the oblique force on the inclined guide hole 411 is decomposed into a force parallel to the axial direction of the core column body 310 and a force perpendicular to the axial direction of the core column body 310. Since the inner pull-out slider driver 410 is disposed in the central channel 311 and can only move along its axial direction, the force applied by the inclined guide column 510 to the oblique guide hole 411 ultimately pushes the inner pull-out slider driver 410 to move back and forth in two directions along the axial direction of the core column body 310.

[0067] Specifically, the locking mechanism 400 further includes a mounting seat 430, such as Figure 3 As shown, the mounting seat 430 is a block-shaped body, and the end of the inner-drawing slider driving member 410 away from the inner-drawing slider 420 is fixedly connected to the mounting seat 430, and moves synchronously in the central channel 311. The oblique guide hole 411 is opened on the mounting seat 430. Figure 3 When the upper middle part moves, the pressing mounting seat 430 moves rightward, driving the inner slide block driving member 410 to move rightward, and in conjunction with the structure of the inclined slide groove, drives the inner slide block 420 to move toward the axis of the core column body 310, retracts from the first through hole 312 into the core column body 310, and releases the limit on the molded product 130. Figure 3 When moving in the middle and lower part, the squeezing mounting seat 430 moves it to the left, driving the inner pull-out slider driving member 410 to move to the left, and cooperating with the structure of the inclined slide groove, driving the inner pull-out slider 420 to move back to the axis of the core column body 310, extending the outer wall of the core column body 310 from the first through hole 312, and applying a limit to the molded product 130.

[0068] In this embodiment, the drive mechanism 500 further includes a locking member 520 fixedly connected to one end of the inclined guide post 510 away from the inner slide driver 410. The locking member 520 has a protrusion 521. When the inclined guide post 510 is inserted into the inclined guide hole 411 to a predetermined position, the protrusion 521 is configured to press against the end surface of the inner slide driver 410 and limit the movement of the inner slide driver 410. The predetermined position of the inclined guide post 510 is the depth position at which the inclined guide post 510 is inserted into the inclined guide hole 411 when the inner slide 420 is retracted from the first through hole 312 into the core body 310.

[0069] Specifically, such as Figure 3 As shown, when the oblique guide post 510 is fully inserted into the oblique guide hole 411, the mounting seat 430 moves to the leftmost end, and the protrusion 521 abuts against the mounting seat 430 to limit the position, preventing the locking mechanism 400 from retreating due to pressure and generating burrs during injection molding.

[0070] In this embodiment, an inclined groove is provided on the side of the inner-pull-out slider driving member 410, and the bottom of the inner-pull-out slider 420 is installed on the inclined groove and slides along the inclined groove. The side of the inner-pull-out slider 420 abuts against the hole wall of the first through hole 312 and is used to limit the movement of the inner-pull-out slider 420 in the opening direction of the first through hole 312 to extend out of the outer wall of the core column body 310 or retract into the core column body 310.

[0071] Specifically, the inner sliding block 420 is connected to the inner sliding block driving member 410 by means of a slide rail and a protruding block. Figure 3 As shown, the inclined slide is a "T"-shaped slide rail, and the axis of the slide rail and the core column body are located in the same plane and at an angle; the contact surface between the inner pull-out slider 420 and the inclined slide rail is provided with a "T"-shaped protruding block, which is inserted into the slide rail and slides to cooperate with the slide rail, so that the inner pull-out slider 420 remains in contact with the inner pull-out slider driver 410. The inclined slide is designed to narrow as it approaches the product 130. In this way, when the inner pull-out slider driver 410 moves toward the product 130, the inclined slide will squeeze the inner pull-out slider 420 out of the first through hole 312 and extend out of the outer wall of the core column body 310; when the inner pull-out slider driver 410 moves away from the product 130, the inclined slide will retract the inner pull-out slider 420 from the first through hole 312 and retract it into the core column body 310.

[0072] like Figure 3 and Figure 4 As shown, in this embodiment, the inner core pulling demolding device also includes a wear-resistant plate 610, which is arranged on the inner wall of the central channel 311 to reduce the friction force encountered by the inner pulling slider driving member 410 during movement and guide the moving direction of the inner pulling slider driving member 410.

[0073] Specifically, wear plates 610 are provided on the bottom and sides of the mounting seat 430. The bottom wear plate 610 is thinner, while the side wear plates 610 are thicker. The side wear plates 610 are shaped like beadings and act as guides, limiting the direction of movement of the mounting seat 430 and the inner-drawing slider driver 410 and ensuring smooth movement of the mounting seat 430 and the inner-drawing slider driver 410.

[0074] like Figure 3 As shown, in this embodiment, the inner core-pulling demolding device also includes a stop member 620 and a shifting ball 630 arranged on the inner wall of the central channel 311. The stop member 620 is used to limit the moving range of the inner pull-out slider driver 410. When the inner pull-out slider driver 410 abuts against the stop member 620, the shifting ball 630 pops out and engages with the inner pull-out slider driver 410, so as to limit the position of the inner pull-out slider driver 410.

[0075] Specifically, the stopper 620 cooperates with the ball 630 to restrict the inner slide driver 410 to a preset position. This prevents the inner slide driver 410 from shaking during demolding of the product 130, causing the inner slide 420 to suddenly extend and scratch the inside of the product 130. It also prevents the inner slide driver 410 from flashing due to the retreat of the injection molding pressure. The preset position of the inner slide driver 410 is the length at which the inner slide driver 410 slides when the inner slide 420 is retracted from the first through hole 312 into the core body 310.

[0076] Specifically, when the inclined guide post 510 moves upward and withdraws from the inclined guide hole 411, the mounting seat 430 moves to the right to its maximum distance. At this time, the mounting seat 430 abuts the stop member 620, and the bead 630 pops out and abuts the mounting seat 430, relying on friction to limit the position movement of the mounting seat 430, preventing the locking mechanism 400 from retreating due to pressure and generating flash during injection molding. Optionally, a groove can be provided at the bottom of the mounting seat 430 for the bead 630 to insert and limit the position. The bead 630 is used to prevent the mounting seat 430 from moving forward due to external factors after it retreats into place.

[0077] In this embodiment, the core column body 310 is also provided with a second through hole 313, and the first through hole 312 and the second through hole 313 are respectively located on the side walls at both ends of the core column body 310; the driving mechanism 500 passes through the second through hole 313 and cooperates with the other end of the inner sliding block driving member 410.

[0078] Specifically, the internal core-pulling demolding device also includes a stem seat 320. The end of the stem body 310 facing away from the product 130 is fixedly connected to the stem seat 320. A second through-hole 313 is provided in the stem seat 320. The second through-hole is shaped like a receiving groove and is provided on the side of the stem seat 320, with the opening direction being radial to the stem body. The second through-hole 313 communicates with the central channel 311 of the stem body 310. The central channel 311 runs through the stem body 310 and the stem seat 320, and its ends communicate with the first through-hole 312 and the second through-hole 313, respectively. The central channel 311 is divided into two sections, one located in the stem body 310 and the other in the stem seat 320. The stem body 310 and the stem seat 320 are fixedly connected, and the two sections of the central channel 311 are merged and connected into one. The internal pull-out slider driver 410 slides both within the central channel 311 section of the stem body 310 and within the central channel 311 section of the stem seat 320. Optionally, the stem body 310 and the stem seat 320 may be integrally formed, and the two may be combined into a whole. In this case, the central channel 311 is a separate channel.

[0079] The mounting seat 430 is arranged to slide in the second through hole 313, and the inner slide driver 410 is arranged to slide in the stem body 310. The advantage of this design is that the mounting seat 430 contacts and moves with the stem seat 320, driving the inner slide driver 410 to insert and move into the stem body 310, which is convenient for replacing and repairing parts, and other structures can be matched on the mounting seat 430 and the stem seat 320. Because the material of the mounting seat 430 is hard iron and the material of the stem seat 320 is soft iron, if the two are in direct contact, the mounting seat 430 will scratch the stem seat 320 under the force of its own weight, resulting in unsmooth movement. Therefore, the wear-resistant plate 610 at the bottom of the mounting seat 430 has the effect of preventing scratching and wear.

[0080] Since the core column seat 320 can support the core column body 310 in the axial direction of the core column body 310, and the core column seat 320 has high strength, during injection molding, the core column body 310 and the core column seat 320 can withstand greater injection pressure in the axial direction of the core column body 310, avoiding the core column body 310 and the core column seat 320 from moving in the axial direction of the core column body 310 due to excessive injection pressure; since the core column body 310 can withstand greater injection pressure in the axial direction of the core column body 310, the rib grooves on the product 130 can be better formed, that is, thinner rib grooves can be injection molded under the same conditions, which can effectively reduce the risk of stress marks and shrinkage marks on the outer surface of the product 130, and ensure that the main wall thickness of the product 130 at the same strength can be reduced accordingly, reducing the amount of glue and reducing the injection molding cost, because when injecting thinner rib grooves, the injection molding machine needs to apply greater injection pressure to fully fill the rib groove position with molten plastic.

[0081] like Figure 9 As shown, in this embodiment, a locking groove 314 is provided on the inner wall of the central channel 311, and the opening of the locking groove 314 faces the second through hole 313; the driving mechanism 500 passes through the second through hole 313 and cooperates with the inner-pull-out slider driving member 410 and is inserted into the locking groove 314, and the driving mechanism 500 and the inner-pull-out slider driving member 410 are limited by the locking groove 314 together.

[0082] Specifically, the oblique guide post 510 passes through the second through hole 313 and is engaged with the oblique guide hole 411 of the mounting seat 430 and then inserted into the locking groove 314 .

[0083] like Figure 4 and Figure 5 As shown, in this embodiment, a cooling circuit 700 is provided in the core column body 310, and the cooling circuit 700 includes a liquid inlet line and a liquid outlet line. The liquid inlet line and the liquid outlet line are axially arranged on both sides of the axis of the core column body 310, and are intertwined at one end of the core column body 310 close to the product 130 to form a spiral structure 710 for increasing the cooling contact area.

[0084] Specifically, the liquid inlet and outlet of the cooling circuit 700 are arranged at the bottom of the stem seat 320, and the cooling circuit 700 is distributed in the stem seat 320 and the stem body 310. Figure 2 As shown, the spiral structure 710 refers to a portion of the cooling circuit 700 that is spirally distributed around the axial direction of the core column body 310, thereby achieving 360-degree lateral heat dissipation of the core column body 310. Figure 5 As shown, since one end of the stem body 310 is fixedly connected to the stem seat 320, the stem body 310 can be provided with a bypass water channel for balancing the mold temperature in the region of the stem seat 320 by adding a large-diameter fountain or other means. The bypass water channel is a branch of the cooling circuit 700 and is provided within the stem seat 320 to reduce the temperature of the first mold 110 and the second mold 120 on both sides of the stem seat 320. The bypass water channel with a larger space on the stem seat 320 can be directly added in a conventional manner, effectively enhancing the ability to withstand lateral injection pressure, while also enhancing the ability to quickly adjust the mold temperature in the region of the stem body 310, thereby reducing the injection cycle and improving injection efficiency.

[0085] Since the design of the locking structure of this embodiment saves a lot of space compared to the prior art, a larger bypass water channel can be added in the stem seat 320.

[0086] like Figure 1 、 Figure 2 and Figure 6 As shown, the push plate mechanism 200 in this embodiment also includes a push plate seat 210, a push plate seat guide column 220, an ejection block 230, a slider 240 and a reset member 250, and the internal core pulling and demolding device also includes a core column seat guide column 330, a first mold 110, a second mold 120, an ejection guide block 800 and a second driving mechanism.

[0087] One end of the stem seat guide pin 330 is fixedly connected to the second mold 120 , and the stem seat 320 and the first mold 110 are sequentially sleeved on the stem seat guide pin 330 and can move thereon.

[0088] The push plate seat 210 is provided with a third through-hole that mates with the stem body 310 and a fourth through-hole that mates with the push plate seat guide post 220. An ejector block 230 is fixedly disposed adjacent to the third through-hole, which abuts against the formed product 130. The ejector block 230 is positioned on the side of the push plate seat 210 facing the product and is used to eject the formed product. One end of the push plate seat guide post 220 is fixedly connected to the stem body 320, and the push plate seat 210 is slidably connected to and able to slide on the push plate seat guide post 220. In this embodiment, there is one third through-hole and two fourth through-holes, one on either side of the third through-hole.

[0089] One end of the stem body 310 extends through the third through hole and out of the push plate seat 210. An ejection block 230 is provided on the push plate seat 210, thereby making it easier to eject the product 130 on the stem body 310.

[0090] In this embodiment, the push plate seat guide column 220 and the stem body 310 are located on the same side of the stem seat 320. Furthermore, a reset member 250 is provided on the push plate seat guide column 220. The reset member 250 has a force that causes the push plate seat 210 to slide toward the stem seat 320. Preferably, the reset member 250 is a spring, one end of the spring abuts against the push plate seat 210, and the other end of the spring abuts against the

[0091] The end of the push plate seat guide post 220 away from the push plate seat 210 abuts against the push plate seat 210 .

[0092] The stem seat guide 330 is oriented perpendicularly to the axis of the stem body 310. A second drive mechanism is fixedly connected to the stem seat 320 and is used to propel the stem seat 320 in a direction perpendicular to the axis of the stem body 310, i.e., along the stem of the stem seat guide 330. Optionally, the second drive mechanism is a driving rod of an injection molding machine.

[0093] In this embodiment, guide sleeves (such as linear bearings) are provided between the push plate seat guide column 220 and the push plate seat 210 and between the core column seat guide column 330 and the core column seat 320 to reduce friction during relative sliding.

[0094] The ejector guide block 800 is fixedly connected to the second mold 120. It is provided with a connected oblique sliding hole 810 and a straight sliding hole 820. The oblique sliding hole 810 extends at an angle to the axial direction of the stem body 310, while the straight sliding hole 820 extends perpendicularly to the axial direction of the stem body 310. A slider 240 is fixedly provided on the ejector seat, cooperating with the oblique sliding hole 810 and the straight sliding hole 820. When the second drive mechanism drives the stem seat 320 to slide in the direction of the stem seat guide 330, the slider 240 first slides within the straight sliding hole 820 to release the product 130 from the second mold 120. The slider 240 then slides within the oblique sliding hole 810 and drives the ejector plate seat 210 to slide relative to the stem seat 320 in the axial direction of the stem body 310.

[0095] The slider 240 is provided with a roller, which cooperates with the inclined sliding hole 810 and the straight sliding hole 820, thereby reducing the friction between the slider 240 and the inclined sliding hole 810 and the straight sliding hole 820, and reducing the wear of the mold.

[0096] In this embodiment, there are two ejection guide blocks 800, which are respectively arranged at both ends of the push plate seat 210. The push plate seat 210 and the core column seat 320 are both located between the two ejection guide blocks 800, and sliders 240 are provided at both ends of the push plate seat 210.

[0097] In this embodiment, in actual use, the axial direction of the core column body 310 can be either vertical or horizontal. When the axial direction of the core column body 310 is vertical, the product 130 is vertically upward, and the first mold 110 and the second mold 120 are left and right molds. When the axial direction of the core column body 310 is horizontal, the product 130 is horizontal, the first mold 110 is the upper mold, and the second mold 120 is the lower mold. The first mold 110 and the second mold 120 are also called the male mold and the female mold. The two molds cooperate to form a receiving cavity. The core column body 310 is disposed in the receiving cavity and cooperates with the receiving cavity to form a cavity with the same structure as the product 130.

[0098] The working principle of this embodiment is described below:

[0099] like Figures 6 to 9 As shown, in the initial state, slider 240 is located in straight slide hole 820, first mold 110, stem seat 320, and second mold 120 are sequentially overlapped, inclined guide post 510 is fully inserted into the inclined slide groove, mounting seat 430 and inner slide driver 410 move toward product 130, and the distance between them and product 130 reaches a minimum, while inner slide 420 extends the maximum distance from first through hole 312. Injection molding is completed by first mold 110 and second mold 120, and product 130 is formed on stem body 310 and locked with inner slide 420.

[0100] like Figure 10 As shown, for ease of observation, the first mold 110 and the second mold 120 are not shown in the figure. During demoulding, the first mold 110 first moves along the core column seat guide column 330 away from the core column seat 320, so that the product 130 is separated from the first mold 110. The anti-locking member 520 and the inclined guide column 510 are driven to move together, and the inclined guide column 510 is pulled out of the inclined slide groove. The inclined guide column 510 squeezes and drives the mounting seat and the inner pull-out slider driving member 410 to move back to the product 130. The distance from the product 130 reaches the maximum value, and the inner pull-out slider 420 retracts into the first through hole 312, and the engagement relationship with the product 130 is released. The mounting seat 430 abuts the stop member 620, and the shifting bead 630 pops out and engages with the mounting seat 430. The two cooperate to limit the position of the mounting seat 430.

[0101] like Figure 11As shown, for ease of observation, the first mold 110 and the second mold 120 are not shown in the figure. The second drive mechanism then pushes the stem seat 320 to move in a direction perpendicular to the axial direction of the stem body 310, that is, along the column direction of the stem seat guide 330. The slider 240 first slides a distance within the straight slide hole 820, allowing the molded product 130 to separate from the second mold 120. The slider 240 then slides into the inclined slide hole 810, driving the push plate seat 210 and the ejector block 230 to move along the push plate seat guide 220. The ejector block 230 ejects the molded product 130 from the stem body 310, thereby preventing the product 130 from being damaged by friction with the first mold 110 or the second mold 120. In this embodiment, each ejection guide block 800 is provided with a straight sliding hole 820, and the slider 240 first passes through the straight sliding hole 820 and then passes through the inclined slider 240. The product 130 is first lifted and then pushed away from the core column body 310, thereby ensuring that the product 130 is separated from the second mold 120 by a sufficient distance, making it easier for the robot to take the product 130 away.

[0102] Finally, the push plate mechanism 200 is reset. Under the action of the second driving mechanism, the core column seat 320 is reset, and the push plate seat 210 is synchronously reset under the joint action of the reset member 250 and the inclined sliding hole 810. After the push plate seat 210 is in place, the reset is completed.

[0103] Second embodiment

[0104] like Figure 12 As shown, the second embodiment of the present invention provides an internal core-pulling demolding device. Its structure is generally the same as that of the first embodiment, except that in this embodiment, the number of core column bodies 310 and locking mechanisms 400 is the same and multiple, and the push plate mechanism 200 is mounted on multiple core column bodies 310 and can move on multiple core column bodies 310 simultaneously. The number of core column bodies 310 and locking mechanisms 400 is the same and multiple, so that multiple products 130 can be processed simultaneously.

[0105] In summary, the internal core-pulling demolding device of the present invention locks the position of the product 130 via a locking mechanism 400. After the product 130 is formed, the locking mechanism 400 releases the lock and ejects the product 130 via a push plate mechanism 200. This solves the problem of the excessive length of conventional internal core-pulling demolding devices, offering advantages such as a compact size, simplified mold structure, and reduced mold costs. By changing the method for locking and ejecting the product 130, the traditional long cylinder-driven core-pulling structure is eliminated, reducing mold size.

[0106] Optionally, a wear-resistant plate 610 is added to the inner wall of the central channel 311. The shape of the wear-resistant plate 610 can guide the movement direction of the inner-pull-out slider driver 410, and can also achieve the effect of reducing friction and smooth movement, thereby avoiding direct contact between the inner-pull-out slider driver 410 and the core column body 310 to cause wear.

[0107] Optionally, a stop member 620 and a shifting ball 630 are further provided on the inner wall of the central channel 311, which are used to limit the inner pull-out slider driver 410 to a preset position, so as to avoid the problem that the inner pull-out slider driver 410 shakes when the product 130 is demolded, causing the inner pull-out slider 420 to suddenly extend and scratch the inner side of the product 130, and can also prevent the inner pull-out slider driver 410 from generating flash due to the retreat of the injection pressure.

[0108] Optionally, the stem body 310 is further provided with a second through hole 313, and a locking groove 314 is provided on the inner wall of the central passage 311. The driving mechanism 500 passes through the second through hole 313 and, after cooperating with the inner-drawing slider driver 410, is inserted into the locking groove 314. The driving mechanism 500 and the inner-drawing slider driver 410 are both restrained by the locking groove 314, thereby fixing the positions of the inner-drawing slider driver 410 and the inner-drawing slider 420.

[0109] Optionally, a cooling circuit 700 comprising a liquid inlet and outlet is provided within the core body 310. The inlet and outlet lines are axially arranged on either side of the core body 310 axis and intertwined to form a spiral structure 710 at the end of the core body 310 near the product 130. This increases the cooling contact area and effectively cools the center of the core. This effectively improves the ability to withstand lateral injection pressure and regulate mold temperature.

[0110] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this utility model should be included in the scope of protection of the present utility model. Therefore, the scope of protection of the present utility model shall be based on the appended claims.

Claims

1. An internal core-pulling demoulding device for removing a product from a mold, characterized in that: It includes a push plate mechanism, a core column body, a locking mechanism and a driving mechanism; The core column body is provided with a central channel arranged along its axial direction and a first through hole communicating with the central channel; The locking mechanism includes an inner-drawing slider driver and an inner-drawing slider; the inner-drawing slider driver is installed in the central channel and can slide along the axial direction thereof; the inner-drawing slider is installed in the first through hole and can slide in the first through hole, and one end of the inner-drawing slider driver is engaged with the inner-drawing slider; The driving mechanism cooperates with the other end of the inner-extraction slider driving member and is used to drive the inner-extraction slider driving member to move axially along the stem body in the central channel, so as to drive the inner-extraction slider to extend from the first through hole to the outer wall of the stem body or to retract into the stem body; The push plate mechanism is sleeved on the core column body and can move on the core column body along the axial direction of the core column body to push the formed product away from the core column body.

2. The inner core-pulling demoulding device according to claim 1, characterized in that: The driving mechanism includes an inclined guide column, and an end of the inner-pull-out slider driving member away from the inner-pull-out slider is provided with an inclined guide hole that cooperates with the inclined guide column; the moving direction of the inclined guide column is perpendicular to the axial direction of the core column body, and when the inclined guide column slides in the inclined guide hole, it can drive the inner-pull-out slider driving member to move synchronously along the axial direction of the core column body.

3. The inner core-pulling demoulding device according to claim 2, characterized in that: The driving mechanism also includes a locking member fixedly connected to one end of the inclined guide column away from the inner-pull-out slider driving member, and the locking member is provided with a protrusion. When the inclined guide column is inserted into the inclined guide hole to a preset position, the protrusion is configured to press the end surface of the inner-pull-out slider driving member and to limit the moving position of the inner-pull-out slider driving member.

4. The inner core-pulling demoulding device according to claim 1, characterized in that: An inclined groove is provided on the side of the inner-pull-out slider driving member, and the bottom of the inner-pull-out slider is mounted on the inclined groove and slides along the inclined groove. The side of the inner-pull-out slider abuts against the hole wall of the first through hole and is used to limit the movement of the inner-pull-out slider in the opening direction of the first through hole so as to extend out of the outer wall of the core column body or retract into the core column body.

5. The inner core-pulling demoulding device according to claim 1, characterized in that: The inner core-pulling demoulding device also includes a wear-resistant plate, which is arranged on the inner wall of the central channel and is used to reduce the friction force encountered by the inner core-pulling slider driving member during movement and guide the moving direction of the inner core-pulling slider driving member.

6. The inner core-pulling demoulding device according to claim 1, characterized in that: The inner core-pulling demolding device also includes a stopper and a shifting ball arranged on the inner wall of the central channel. The stopper is used to limit the moving range of the inner pull-out slider driver. When the inner pull-out slider driver abuts against the stopper, the shifting ball pops out and engages with the inner pull-out slider driver to limit the position of the inner pull-out slider driver.

7. The inner core-pulling demoulding device according to claim 1, characterized in that: The core column body is further provided with a second through hole, and the first through hole and the second through hole are respectively located on the side walls at both ends of the core column body; the driving mechanism passes through the second through hole and cooperates with the other end of the inner sliding block driving member.

8. The inner core-pulling demoulding device according to claim 7, characterized in that: A locking groove is provided on the inner wall of the central channel, and the opening of the locking groove faces the second through hole; the driving mechanism passes through the second through hole and is inserted into the locking groove after cooperating with the inward-pull-out slider driving member, and the driving mechanism and the inward-pull-out slider driving member are limited by the locking groove together.

9. The inner core-pulling demoulding device according to claim 1, characterized in that: A cooling circuit is provided in the core column body, and the cooling circuit includes a liquid inlet line and a liquid outlet line. The liquid inlet line and the liquid outlet line are axially arranged on both sides of the axis of the core column body, and are intertwined and wound around one end of the core column body close to the product to form a spiral structure for increasing the cooling contact area.

10. The inner core-pulling demoulding device according to claim 1, characterized in that: The push plate mechanism includes a push plate seat and an ejector block. The push plate seat is provided with a third through hole that cooperates with the core column body. The ejector block is arranged on the side of the push plate seat facing the product. The ejector block is fixedly arranged next to the third through hole for ejecting the formed product.

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