A tilt extraction mechanism

Abstract

The utility model relates to injection mold technical field especially relates to a kind of oblique extraction mechanism, including front template and rear template, and front template is equipped with front die pin, and rear template is equipped with rear die pin, and front die pin is oppositely arranged with rear die pin and forms the cavity for molding product;Front die pin, rear die pin and rear template are equipped with through-hole, and through-hole penetrates rear template, rear die pin and front die pin;Oblique sliding block is slidably connected in through-hole, and one end of oblique sliding block extends into cavity and is used for the barb of molding product;The side, away from front die pin, of rear template is provided with rear spring plate, and cavity is formed between rear spring plate and rear template, and draw hook is arranged in cavity, and draw hook has hook portion, recess is equipped on oblique sliding block and is matched with hook portion, recess and hook portion are connected, and draw hook is fixedly connected with rear spring plate;Wear plate is equipped on rear spring plate, and wear plate is contacted with one end of oblique sliding block, away from front die pin, and the utility model is simple in structure, and movement is stable, effectively prevent product from being pulled, improve molding quality and mould life.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a slanted extraction mechanism. Background Technology

[0002] In the field of injection molding, when molding products with barbed structures, a slanted ejector mechanism is typically required for demolding. Existing slanted ejector mechanisms often employ sliders or slanted ejectors, but these are prone to jamming, severe wear, and even product damage due to inaccurate guidance during operation. Furthermore, some slanted ejector mechanisms are complex in structure, inconvenient to install and maintain, and prone to loosening or failure after repeated use, affecting molding accuracy and mold lifespan. For example, traditional slanted slider mechanisms may deviate from the intended trajectory during mold opening due to uneven force, leading to damage to the barbed parts or difficulty in demolding. Therefore, there is an urgent need for a slanted ejector mechanism with a simple structure, smooth movement, and high reliability to solve these problems. Utility Model Content

[0003] The purpose of this invention is to provide a slanted pulling mechanism to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a slanted pulling mechanism, comprising a front template and a rear template, wherein the front template is provided with a front mold core, and the rear template is provided with a rear mold core, the front mold core and the rear mold core are arranged opposite to each other to form a cavity for molding a product; the front mold core, the rear mold core and the rear template are provided with slanted through holes, the through holes penetrating the rear template, the rear mold core and the front mold core; a slanted slider is slidably connected in the through holes, one end of the slanted slider extends into the cavity and is used for a barb of the molded product; a rear spring plate is provided on the side of the rear template away from the front mold core, a cavity is formed between the rear spring plate and the rear template, a pull hook is provided in the cavity, the pull hook has a hook part, the slanted slider is provided with a groove that cooperates with the hook part, the groove engages with the hook part, and the pull hook is fixedly connected to the rear spring plate; a wear-resistant plate is provided on the rear spring plate, the wear-resistant plate is in contact with the end of the slanted slider away from the front mold core.

[0005] Preferably, the sliding direction of the inclined slider forms an acute angle with the mold opening direction, and the acute angle is 15-35°.

[0006] Preferably, the inclined slider is further provided with a limiting boss, which contacts the rear mold core to limit the position of the inclined slider.

[0007] Preferably, the through hole includes a first through hole, a second through hole, and a third through hole. The first through hole is located in the rear mold plate, the second through hole is located in the rear mold core, and the third through hole is located in the front mold core. The diameter of the first through hole is larger than the diameters of the second and third through holes, and the diameters of the second and third through holes are equal.

[0008] Preferably, the hook is fixedly connected to the rear spring plate by bolts.

[0009] Compared with existing technologies, this utility model provides a slanted sliding mechanism with the following advantages: By setting a hook between the rear template and the rear spring plate and engaging with a groove on the slanted slider, combined with a slanted through-hole structure, this utility model achieves smooth and precise slanted sliding of the slider during mold opening, effectively avoiding jamming or product damage caused by unstable movement. The wear-resistant plate significantly reduces frictional wear between the slanted slider and the rear spring plate, extending the service life of key moving parts. The segmented design of the through holes with gradually changing diameters facilitates the installation and sliding of the slanted slider, enhances guiding accuracy, and prevents slant. The limiting boss structure ensures accurate positioning of the slanted slider in the mold-closed state, further improving molding stability. The overall structure is compact and reasonable, with reliable movement, easy installation and maintenance, and is particularly suitable for precision injection molding of products with complex barbed structures, possessing high practical value and promising prospects for promotion. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the product structure of this utility model; Figure 2 This is a schematic diagram of the injection-molded structure in the mold-closed state of this utility model; Figure 3 This is a schematic diagram of the structure of the pull hook removal method of this utility model; Figure 4 This is a schematic diagram illustrating the principle of this utility model.

[0011] Explanation of reference numerals in the attached drawings: 1. Front template; 11. Front mold core; 2. Rear template; 21. Rear mold core; 3. Product; 31. Protrusion; 32. Barb; 321. First barb; 322. Second barb; 4. Through hole; 41. First through hole; 42. Second through hole; 43. Third through hole; 5. Slanted slider; 51. Groove; 52. Limiting boss; 6. Rear spring plate; 7. Cavity; 8. Pull hook; 81. Hook; 9. Wear-resistant plate; 10. Bolt. Detailed Implementation

[0012] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model: like Figure 1 The diagram shown is a structural schematic of the product 3 formed by this invention. Product 3 has an oblique protrusion 31, on which a barb 32 structure is formed. The barb 32 includes a first barb 321 and a second barb 322. Due to the presence of the barb 32, conventional mold opening methods cannot achieve smooth demolding; a demolding mechanism capable of lateral movement must be used to avoid damaging the product.

[0013] like Figure 2-4 As shown, the present invention provides a slanted extraction mechanism, including a front template 1 and a rear template 2. The front template 1 is provided with a front mold core 11, and the rear template 2 is provided with a rear mold core 21. The front mold core 11 and the rear mold core 21 are arranged opposite to each other to form a cavity for molding a product 3. The cavity is used to contain molten plastic and mold the product; its shape is designed according to product requirements.

[0014] A single, obliquely oriented through hole 4 is provided on the front mold core 11, the rear mold core 21, and the rear template 2, penetrating through the rear template 2, the rear mold core 21, and the front mold core 11. The through hole 4 consists of three sections: a first through hole 41, a second through hole 42, and a third through hole 43. The first through hole 41 is located in the rear template 2, the second through hole 42 is located in the rear mold core 21, and the third through hole 43 is located in the front mold core 11. The diameter of the first through hole 41 is larger than the diameters of the second and third through holes 42 and 43. This design facilitates the installation and sliding of the inclined slider 5 while reducing motion resistance. The diameters of the second and third through holes 42 and 43 are equal, ensuring the guiding accuracy of the inclined slider during movement and preventing deflection.

[0015] A slidable slider 5 is slidably connected to the through hole 4. One end of the slidable slider 5 extends into the cavity and is used to form the barb 32 of the product 3. Since the protrusion 31 and the barb 32 of the product 3 are sloping structures, their extension directions form an acute angle β with the mold opening direction. Correspondingly, the axial direction of the through hole 4 is also set to form the same angle β with the mold opening direction, and the sliding direction of the slidable slider 5 is also consistent with it. In this embodiment, the angle β is 25°. If the angle β between the extension direction of the protrusion 31 and the barb 32 and the mold opening direction is between 15° and 35°, the angle between the through hole 4, the slidable slider 5 and the mold opening direction should be consistent with β and between 15° and 35°. By making the tilt angle of the through hole 4, the tilt angle of the slidable slider 5 and the tilt angle of the protrusion 31 consistent, all being angle β, it can be ensured that the slidable slider 5 can smoothly disengage along the same sloping path as the barb 32 during the mold opening process, effectively avoiding damage to the product and achieving smooth demolding.

[0016] A movable rear spring plate 6 is provided on the side of the rear mold plate 2 away from the front mold core 11, forming a cavity 7 between the rear spring plate 6 and the rear mold plate 2. A pull hook 8 is provided within the cavity 7, with a hook portion 81. A groove 51 on the inclined slide block 5 mates with the hook portion 81, engaging with the hook portion 81. This connection between the pull hook 8 and the inclined slide block 5 enables power transmission. The pull hook 8 is fixedly connected to the rear spring plate 6 by bolts 10, ensuring a secure connection and facilitating disassembly and maintenance. A wear-resistant plate 9 is provided on the rear spring plate 6, contacting the end of the inclined slide block 5 away from the front mold core 11. The wear-resistant plate 9 reduces friction between the inclined slide block 5 and the rear spring plate 6, minimizing wear and extending the mold's service life.

[0017] In order to precisely control the final position of the inclined slide block 5 in the mold closing state and prevent it from extending too far into the cavity, a limiting boss 52 is also provided on the inclined slide block 5. When the mold is fully closed, the limiting boss 52 contacts the rear mold core 21, thereby limiting the inclined slide block 5 from moving forward and ensuring the accuracy of the molding dimensions.

[0018] Based on the principle of cosine functions, since the inclination angle β of protrusion 31 and barb 32 is already determined, the angle between the inclined slider 5, through hole 4, and the mold opening direction must also be designed to be β. The total length of protrusion 31 and barb 32 is L. After β is determined, to ensure that the inclined slider 5 completely detaches from protrusion 31 and barb 32, the displacement C of the inclined slider 5 along the direction of through hole 4 must be greater than L. The displacement of the inclined slider 5 along the direction of through hole 4 depends on the displacement b of the rear spring plate 6, that is, C = (b / cosβ) > L. In other words, the displacement b of the rear spring plate 6 is designed to be greater than L·cosβ. This is also the principle of the structural parameter design of this utility model, where the constant values ​​are L and β, where L is the total length of protrusion 31 and barb 32, b is the displacement of the rear spring plate, and C is the displacement of the inclined slider 5. This ensures that the inclined slider 5 can completely detach from the barb structure during the mold opening process, avoiding interference or damage.

[0019] The working principle and operation process of this utility model are as follows: 1. Mold closing and injection molding stage: Driven by the injection molding machine, the front mold plate 1 and the rear mold plate 2 close together, and the front mold core 11 and the rear mold core 21 close to form a cavity. At this time, the rear spring plate 6 moves forward under the action of the driving mechanism (such as the injection molding machine ejector rod). The rear spring plate 6 drives the hook 8 fixed on it to move forward together. The hook part 81 of the hook 8 pushes the groove 51 on the inclined slide block 5, driving the inclined slide block 5 to move forward along the inclined through hole 4 and in the inclined direction. When the inclined slide block 5 moves forward to the point where the limiting boss 52 on the inclined slide block 5 contacts the rear mold core 21, the movement stops. The inclined slide block 5 accurately reaches the predetermined molding position, and the front end of the inclined slide block 5 completely forms part of the product barb 32 in the cavity. Subsequently, the molten plastic is injected into the cavity, and after holding pressure and cooling, a product 3 with the barb 32 structure is formed.

[0020] 2. Mold opening and angled demolding stage: After injection molding, the mold begins to open. First, the front mold plate 1 drives the front mold core 11 to separate from the main surface of the product 3 (the main parting surface opens). Next, the rear spring plate 6 begins to move backward under the action of the drive mechanism, and the rear spring plate 6 drives the pull hook 8 to move backward together. The hook part 81 of the pull hook 8 acts on the groove 51 of the inclined slider 5, applying a backward pulling force to the inclined slider 5. Since the inclined slider 5 is constrained in the inclined through hole 4 at an angle β with the mold opening direction, the backward pulling force is decomposed into two components: one component causes the inclined slider 5 to move backward, and the other component forces the inclined slider 5 to move laterally away from the product barb 32. Under the combined action of these two components, the inclined slider 5 smoothly moves backward along the through hole 4, and the part of the inclined slider 5 forming the barb 32 gradually completely separates from the barb structure of the product 3. During this process, the wear-resistant plate 9 slides in contact with the end of the inclined slider 5, effectively reducing frictional resistance and wear.

[0021] 3. Reset Phase: After demolding is completed, before the start of the next injection cycle, the mold performs a mold closing action. The rear spring plate 6 is reset and moved forward under the action of the drive mechanism, and pushes the inclined slider 5 again through the pull hook 8, so that the inclined slider 5 is precisely reset to the mold closing and forming position along the through hole 4, preparing for the next injection cycle.

[0022] This invention utilizes a linkage structure between the rear spring plate 6, the hook 8, and the inclined slider 5. During mold opening, the rear spring plate 6 drives the hook 8, which pulls the inclined slider 5 along the inclined direction via the groove 51. This allows the inclined slider 5 to smoothly disengage from the product's barb 32, preventing product damage and improving the demolding success rate. The sliding direction of the inclined slider 5 forms an angle of 15–35° with the mold opening direction, ensuring smooth movement and directional stability. The inclined slider 5 is equipped with a limiting boss 52 that contacts the rear mold core 21, effectively limiting the position of the inclined slider 5 and preventing excessive forward movement. The through holes adopt a three-section design. The first through hole 41 has a larger diameter for easy installation and movement, while the second and third through holes 42 and 43 have equal diameters, ensuring guiding accuracy and reducing processing and assembly difficulty. The hook 8 is fixedly connected to the rear spring plate 6 by bolts 10, resulting in a stable structure that is easy to disassemble and reassemble, facilitating maintenance and replacement. The wear-resistant plate 9 on the rear spring plate 6 contacts the end of the inclined slide block 5, significantly reducing friction and wear and extending the service life of the mold. The overall structure is compact, the operation is simple, and the molding efficiency and quality are improved, making it suitable for molding various complex products.

[0023] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A slanted drawing mechanism, comprising a front template (1) and a rear template (2), wherein the front template (1) is provided with a front mold core (11) and the rear template (2) is provided with a rear mold core (21), characterized in that: The front mold core (11) and the rear mold core (21) are arranged opposite to each other to form a cavity for molding the product (3); the front mold core (11), the rear mold core (21) and the rear template (2) are provided with obliquely arranged through holes (4), the through holes (4) penetrate the rear template (2), the rear mold core (21) and the front mold core (11); an oblique slider (5) is slidably connected in the through hole (4), one end of the oblique slider (5) extends into the cavity and is used for the barb (32) of the product (3); the rear template (2) is provided with a side away from the front mold core (11) A rear spring plate (6) is provided, and a cavity (7) is formed between the rear spring plate (6) and the rear template (2). A hook (8) is provided in the cavity (7). The hook (8) has a hook part (81). The inclined slider (5) is provided with a groove (51) that cooperates with the hook part (81). The groove (51) is engaged with the hook part (81). The hook (8) is fixedly connected to the rear spring plate (6). A wear-resistant plate (9) is provided on the rear spring plate (6). The wear-resistant plate (9) is in contact with the end of the inclined slider (5) away from the front mold core (11).

2. The inclined pulling mechanism according to claim 1, characterized in that: The sliding direction of the inclined slider (5) forms an acute angle with the mold opening direction, and the acute angle is 15-35°.

3. The inclined pulling mechanism according to claim 1, characterized in that: The inclined slider (5) is also provided with a limiting boss (52), which contacts the rear mold core (21) to limit the position of the inclined slider (5).

4. The inclined pulling mechanism according to claim 1, characterized in that: The through hole (4) includes a first through hole (41), a second through hole (42) and a third through hole (43). The first through hole (41) is located in the rear template (2), the second through hole (42) is located in the rear mold core (21), and the third through hole (43) is located in the front mold core (11). The diameter of the first through hole (41) is greater than the diameters of the second through hole (42) and the third through hole (43), and the diameters of the second through hole (42) and the third through hole (43) are equal.

5. The inclined pulling mechanism according to claim 1, characterized in that: The hook (8) is fixedly connected to the rear spring plate (6) by bolts (10).

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