A core pulling mechanism

Abstract

The present invention provides a core-pulling mechanism, comprising: a first limiting structure and a first slider, the inner side of the first slider being slidably connected to the first limiting structure, a second limiting structure and a second slider, the inner side of the second slider being slidably connected to the outer side of the first slider, and a telescopic mechanism for causing the first slider to reciprocate, wherein the sliding contact surface between the first slider and the second slider is an inclined surface, and the second limiting structure limits the second slider so that the second slider does not displace in the reciprocating direction of the first slider. Thus, when the first slider reciprocates in one direction, the second slider can be driven to reciprocate in the second direction by the inclined surface of the sliding contact, thereby enabling external core pulling of the fixed mold. The use of core pulling in the fixed mold avoids line clamping. The core-pulling mechanism is simple, low in complexity, and highly stable. At the same time, the use of external core pulling facilitates assembly and disassembly.

Description

Technical Field

[0001] The invention relates to the field of processing and manufacturing, and in particular to a double-slider core-pulling mechanism for preventing wire pinching. Background Art

[0002] Currently, in the field of processing and manufacturing, for some products with deep holes and grooves, the following problems are usually encountered: a slider-inserted core-pulling mechanism or an inverted mold core-pulling structure.

[0003] 1. Slider-inlaid core-pulling structures often have defects such as pinch lines on the product surface. This is especially true for inlaid structures, where gaps in the inlays can cause pinch lines and splicing marks. For high-quality exterior parts, pinch lines must be avoided.

[0004] 2. Use flip mold for core pulling. Conventional appearance surface is in the fixed mold, while the appearance surface of flip mold is in the movable mold. Generally, the core pulling mechanism is designed inside the mold, which leads to the complex structure of mold assembly and great difficulty in assembly. Summary of the Invention

[0005] To solve at least one of the above problems, the present invention provides a core-pulling mechanism.

[0006] A core pulling mechanism includes: a first limiting structure and a first slider, the inner side of the first slider is slidably connected to the first limiting structure; a second limiting structure and a second slider, the inner side of the second slider is slidably connected to the outer side of the first slider; and a telescopic mechanism for making the first slider reciprocate, wherein the sliding contact surface between the first slider and the second slider is an inclined surface, and the second limiting structure limits the second slider so that the second slider does not displace in the reciprocating motion direction of the first slider.

[0007] As a result, when the first slider reciprocates in one direction, the second slider is driven to reciprocate in a second direction via the sliding contact inclined surface, enabling core pulling from the fixed mold. This avoids wire pinching. The core pulling mechanism is simple, less complex, and more stable. Furthermore, using external core pulling facilitates assembly and disassembly.

[0008] Furthermore, it also includes a pin connected to the outside of the second slider and moving synchronously with the second slider, so that the reversible core pulling mechanism composed of the double sliders can be used to perform fixed mold external core pulling on features similar to circular holes.

[0009] Furthermore, the tail of the insert pin has a protrusion, and the outer side of the second slider has a fourth slide groove that cooperates with the protrusion. Through the slide groove, the second slider drives the insert pin to reciprocate. When there is stress in directions other than the core pulling direction caused by deviations such as assembly errors, the slide groove connection can absorb the extra stress, making the core pulling operation smoother while preventing product line pinching.

[0010] Preferably, the telescopic mechanism includes a cylinder and a connecting rod, and the lower end of the cylinder is fixedly connected to the upper end of the connecting rod.

[0011] Preferably, the lower end of the connecting rod has a connecting end portion, and the upper end surface of the first slider has a downwardly collapsed groove, the groove corresponding to the connecting end portion. The groove corresponding to the connecting end portion can pre-position the connecting rod and the first slider.

[0012] Preferably, the lower end surface of the connecting end has a connecting rod boss, and the lower surface of the groove has second sliding grooves extending to both sides, through which the connecting rod boss is slidably engaged with the first slider. The sliding grooves can further absorb additional stress caused by deviations such as assembly errors in the transmission part of the telescopic mechanism, making the core pulling operation smoother.

[0013] Preferably, the first limiting structure is an inwardly concave U-shaped structure. The inner wall of the concave cavity of the first limiting structure has an insert groove extending on both sides. The inner side surface of the first slider has a slider boss that matches the insert groove. The slider boss and the insert groove of the first limiting structure cooperate and engage with each other. The inwardly concave U-shaped structure saves space and quality and facilitates the first slider to be fixed in the first limiting structure.

[0014] Preferably, it further comprises: a stopper fixedly connected to the insert groove to limit and fix the first sliding block that is engaged with the insert groove.

[0015] Preferably, the outer surface of the first slider has a protrusion, and the inner surface of the second slider has a recess corresponding to the protrusion. The protrusion and the recess cooperate to facilitate pre-assembly positioning and limit the movement of the product, thereby preventing the product from being clamped due to core pulling displacement deviation.

[0016] Preferably, the protrusion has first sliding grooves on both sides, and the inner wall of the recess inside the second sliding block has third sliding grooves extending on both sides, and the first sliding groove and the third sliding groove cooperate to slide and engage with each other.

[0017] Therefore, the present invention provides a core-pulling mechanism, which performs external core pulling of fixed molds for similar circular hole features through a reversing core-pulling mechanism composed of double sliders. The core pulling is performed in the fixed mold to avoid line clamping. The core-pulling mechanism is simple, less complex, and more stable. At the same time, the external core pulling is used for easy assembly and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0020] Figure 1 This is a schematic diagram of the product structure of the present invention and an enlarged view of part A;

[0021] Figure 2 This is an explosion diagram of a core pulling mechanism of the present invention;

[0022] Figure 3 This is a schematic diagram of a mold assembly according to the present invention and an enlarged view of parts B and C;

[0023] Figure 4 This is the initial state of the core pulling movement of the mold of the present invention and the enlarged view of the local D;

[0024] Figure 5 This is a schematic diagram of the assembly of the mold slider of the present invention;

[0025] Figure 6 Schematic diagram of the fixed mold assembly of the present invention and an enlarged view of part E;

[0026] Figure 7 This is an overall assembly diagram of a core pulling mechanism of the present invention and an enlarged view of a part F;

[0027] Figure 8 This is a schematic diagram of parts of a core pulling mechanism of the present invention;

[0028] Figure 9 This is a schematic diagram of the connection and assembly of a core pulling mechanism of the present invention and an enlarged view of parts G and H;

[0029] Figure 10 This is an assembly diagram of a slider of a core pulling mechanism of the present invention and an enlarged diagram of a local part I;

[0030] Figure 11 This is a motion effect diagram of a core pulling mechanism of the present invention;

[0031] Figure 12 This is a schematic diagram of the core-pulling mechanism of the present invention at the end of core-pulling movement and an enlarged view of local J.

[0032] Description of reference numerals:

[0033] 1-product; 2-cylinder; 3-connecting rod; 4-first slider; 5-insert; 6-second slider; 7-core-pulling pin; 8-fixed mold base plate; 9-hot runner plate; 10-fixed mold fixed plate; 11-movable mold fixed plate; 12-movable mold core; 13-fixed mold core; 14-screw; 15-fixed stopper; S-fixed mold core molding surface; a-product hole; b-screw column hole; c-fixed plate slide; d-slider boss; e-insert groove; f-first slide; h-second slide; i-third slide; j-fourth slide; k-connecting rod boss. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0035] The present invention provides a core pulling mechanism, specifically a double-slider core pulling mechanism to prevent wire pinching, suitable for producing Figure 1 The product 1 shown is particularly suitable for producing product holes a and similar structures in the processed product 1.

[0036] Core pulling mechanism such as Figure 2 As shown, the external core-pulling mechanism is composed of components such as the oil cylinder 2, the connecting rod 3, the first slider 4, the insert 5, the second slider 6 and the core-pulling needle 7, which realizes external core-pulling molding. The fixed mold core is integrally formed to prevent the product from having clipping lines (the surface of the fixed mold core molded product is integral to avoid clipping lines caused by inlay molding). The mechanism has a simple structure, low complexity, and is easy to disassemble and replace, effectively reducing the complexity of mold assembly. The specific structure is as follows:

[0037] The lower end of the oil cylinder 2 is fixedly connected to the upper end of the connecting rod 3. The lower end of the connecting rod 3 has a connecting end, the lower end surface of which has a connecting rod boss k. The upper end surface of the first slider 4 has a downwardly collapsed groove that corresponds to the lower connecting end of the connecting rod 3. The lower surface of the groove has a second chute h extending in both directions. The connecting rod boss k slides and engages with the first slider 4 through the second chute h. The alignment of the groove with the connecting end allows the connecting rod and the first slider to be pre-positioned. The chute combination further absorbs additional stress caused by deviations such as assembly errors in the transmission part of the telescopic mechanism, ensuring smoother core pulling.

[0038] The insert 5 has an inwardly concave U-shaped structure, with the inner wall of the concave cavity having insert grooves e extending on both sides. The inwardly concave U-shaped structure saves space and quality and facilitates the positioning of the first slider in the first limiting structure. The inner side surface of the first slider 4 has a slider boss d that matches the insert groove e. The slider boss d on the first slider 4 and the insert groove e on the insert 5 are mutually engaged. A fixed block 15 is also included. The middle portion of the lower end surface of the insert 5 has a groove corresponding to the fixed block 15, and the groove has a screw hole. The fixed block 15 has a screw 14 corresponding to the screw hole. The screw 14 fixes the fixed block 15 to the groove in the middle portion of the lower end surface of the insert 5, thereby limiting and fixing the first slider 4 that is mutually engaged with the insert groove e.

[0039] The outer surface of the first slider 4 has a protrusion that corresponds to the inner recess of the second slider 6. The protrusion is flanked by first chute grooves f, which slidably engage with third chute grooves i extending from the inner wall of the recess inside the second slider 6. The cooperation between the protrusion and the recess facilitates pre-assembly positioning and limits movement during relative movement, preventing product line clamping due to core pulling deviation.

[0040] The protrusion on the outer side of the first slider 4 is an inclined surface at a certain angle to the vertical direction. As a result, the first slider 4, viewed from the side on both sides, forms a trapezoidal structure with a larger upper end surface and a smaller lower end surface. Correspondingly, the recess on the inner side of the second slider 6 matches the inclined surface of the protrusion on the outer side of the first slider 4. This allows the second slider 6 to move horizontally based on the horizontal component of the inclined surface when the first slider 4 moves vertically up and down, and when the second slider 6 is vertically limited. As a result, when the first slider reciprocates in one direction, the inclined surface in sliding contact drives the second slider to reciprocate in a second direction, thereby enabling external core pulling of the fixed mold. Using core pulling in the fixed mold avoids wire clamping. The core pulling mechanism is simple, low in complexity, and highly stable. The use of external core pulling facilitates assembly and disassembly.

[0041] The outer sides of the second slider 6 are formed with fourth slots j. The tails of the two core-pulling pins 7 have projections corresponding to these slots j, allowing them to slide and engage in the left and right fourth slots j, respectively. This allows the dual-slider, reversible core-pulling mechanism to be used for externally positioned core pulling of features similar to circular holes. Furthermore, the slots allow the second slider to drive the pins in reciprocating motion. Furthermore, the slots absorb stress in directions other than the core-pulling direction caused by deviations such as assembly errors, ensuring smoother core-pulling and preventing product line pinching.

[0042] (1) Assembly relationship of core pulling mechanism:

[0043] Figure 3 、 4 As shown: the oil cylinder 2 is fixed to the fixed mold base plate and the hot runner plate with screws 14 through the screw hole b. The oil cylinder provides the power for the core pulling mechanism to move. Figure 5 In the embodiment, the second slider 6 cooperates with the fixed mold fixing plate 10 through the fixed plate slide c on the fixed mold fixing plate 10. The fixed plate slide c limits the second slider 6 from moving in the vertical direction and can only move in the horizontal direction along the slide; the core pulling forming pin 7 is assembled with the fixed mold core 13 as shown in FIG. Figure 6 As shown, the tail of the core-pulling needle 7 plays the role of core-pulling forming circular hole, and the S surface of the fixed mold core 13 is an integral structure, not an inlaid component, to ensure that there is no clamping line after core pulling. Among them, as long as it is a non-inlaid structure, there will be no clamping line.

[0044] The overall assembly effect of the core pulling mechanism is as follows Figure 7 As shown in the figure, the mechanism consists of various parts such as Figure 7 shown. Figure 9 In the figure, the connecting rod boss k on the connecting rod 3 is assembled on the second slide groove h on the first slider 4, and the connecting rod boss k provides vertical force to the first slider 4; the slider boss d on the first slider 4 cooperates with the insert groove e on the insert 5, and the insert groove e limits and guides the first slider 4 to move vertically. Figure 10 Middle: The first chute f on the first slider 4 and the third chute i on the second slider 6 cooperate with each other, and the first chute f plays a role in giving the chute 2 a motion force perpendicular to the third chute i. However, due to the restriction of the second slider 6 on the fixed plate chute c of the fixed mold core, as shown in FIG. Figure 4 As shown, the upward movement of the second slider 6 is offset, and the second slider 6 can only move in the horizontal direction. The core-pulling forming needle 7 is fixed in the fourth slide j on the second slider 6. If the needle 7 moves in the horizontal direction, it moves in the horizontal direction together with the second slider 6.

[0045] (2) Movement Narrative:

[0046] like Figure 4The figure shows the core pulling movement state. When the core pulling starts, the oil cylinder 2 provides power to drive the connecting rod 3 to move in the vertical positive direction. The connecting rod 3 drives the first slider 4 to move in the vertical direction through the connecting rod boss. The first slide f drives the second slider 6 to move in the horizontal direction along the fixed plate slide c through the third slide i. The fourth slide j on the second slider 6 drives the core pulling forming pin 7 to pull the core in the horizontal direction. Figure 12 As shown, when the oil cylinder 2 drives the first slide block 4 to move vertically for a certain working distance, the core-pulling insert is separated from the product by a certain safety distance, which is generally 0.02 mm, to complete the core-pulling movement.

[0047] Therefore, the present invention uses a double-slide core-pulling mechanism to perform external core pulling on features similar to circular holes. This core pulling in the fixed mold avoids line clamping. Furthermore, the core-pulling mechanism is simple, less complex, and more stable. Furthermore, the external core pulling facilitates assembly and disassembly.

[0048] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0050] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made thereto. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A core pulling mechanism, characterized in that: include: A first limiting structure and a first slider (4), The inner side of the first sliding block (4) is slidably connected to the first limiting structure, and The second limiting structure and the second slider (6), The inner side of the second slider (6) is slidably connected to the outer side of the first slider (4), and A telescopic mechanism is used to make the first slider (4) move back and forth, The sliding contact surface between the first slider (4) and the second slider (6) is an inclined surface. The second limiting structure limits the second slider (6). so that the second slider (6) does not generate displacement in the reciprocating motion direction of the first slider (4); It also includes: a core-pulling needle (7) connected to the outside of the second slider (6) and moving synchronously with the second slider (6); the tail of the core-pulling needle (7) has a protrusion, and the outside of the second slider (6) has a fourth sliding groove that is matched with the protrusion; The first limiting structure is a concave U-shaped structure, the inner wall of the concave cavity of the first limiting structure has an insert groove extending on both sides, the inner side surface of the first slider (4) has a slider boss matching the insert groove, and the slider boss and the insert groove on the first limiting structure are mutually engaged; It also includes a fixed stopper (15), the fixed stopper (15) being fixedly connected to the insert groove to limit and fix the first sliding block (4) that is engaged with the insert groove; The fixed mold fixing plate (10) is provided with a fixed plate sliding groove, and the second sliding block (6) cooperates with the fixed mold fixing plate (10) through the fixed plate sliding groove, so that the second sliding block (6) moves horizontally along the fixed plate sliding groove; The fixed mold core (13) of the fixed mold fixing plate (10) is an integrally formed structure.

2. The core-pulling mechanism according to claim 1, characterized in that: The telescopic mechanism comprises an oil cylinder (2) and a connecting rod (3), wherein the lower end of the oil cylinder (2) is fixedly connected to the upper end of the connecting rod (3).

3. The core-pulling mechanism according to claim 2, characterized in that: The lower end of the connecting rod (3) has a connecting end portion, and the upper end surface of the first sliding block (4) has a downwardly collapsed groove, and the groove corresponds to the connecting end portion.

4. The core-pulling mechanism according to claim 3, characterized in that: The lower end surface of the connecting end portion has a connecting rod boss, and the lower surface of the groove has a second sliding groove extending to both sides, and the connecting rod boss is slidably engaged with the first sliding block (4) through the second sliding groove.

5. The core-pulling mechanism according to claim 1, wherein: The first slider (4) has a protrusion on its outer side, and the second slider (6) has a recess corresponding to the protrusion on its inner side.

6. The core-pulling mechanism according to claim 5, characterized in that: There are first sliding grooves on both sides of the protrusion. A third sliding groove extends from both sides of the inner wall of the recess inside the second sliding block (6). The first sliding groove and the third sliding groove are matched and slidably engaged with each other.

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