Large downhill core-pulling mechanism of injection mold

Abstract

The utility model relates to the technical field of injection molding production, in particular to a large downhill core-pulling mechanism of an injection mold, which comprises a wear-resisting plate (1), a sliding block (2), a pressing strip (3), a straight ejector block (4), a straight ejector rod (5), a guide sleeve (6), a locking block (8), a locking boss (9), a limiting block (10) and a movable mold (M), and is scientific and ingenious in design, simple and reasonable in structure, stable in mechanism movement, good in demolding and core-pulling effect, safe and reliable in action and high in production efficiency. The mass production efficiency is high and the manufacturing cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding production, in particular to a large downhill core pulling mechanism for an injection mold. Background Art

[0002] In injection molding, if a molded product has a large undercut (generally, an angle greater than 35° between the horizontal reference direction and the undercut direction), existing technology typically uses a reversing slider structure. This design results in a relatively high and large slider, resulting in a deep cavity on the movable mold side. To ensure mold strength and production stability, the movable mold needs to be thickened, resulting in a high consumption of mold steel. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides a large downhill core pulling mechanism for an injection mold to solve the above technical problems.

[0004] The technical solution adopted by this utility model is:

[0005] A large downslope core-pulling mechanism for an injection mold comprises a wear-resistant plate, a slider, a pressure strip, a straight ejector block, a straight ejector rod, a guide sleeve, a locking block, a locking boss, a limit block and a movable mold, characterized in that the movable mold is provided with an inclined step, the inclined angle of the inclined step is the ejection angle, the inclined step forms a front step surface and a rear step surface, the wear-resistant plate is fixed on the rear step surface of the inclined step of the movable mold, the pressure strip is fixed on the front upper step surface of the inclined step of the movable mold, and forms a slide groove with the wear-resistant plate, the slider is provided with a transparent working cavity, the working cavity is provided with an inclined platform, the inclined angle of the inclined surface of the inclined platform is the downslope angle, and a locking hole is also provided, the slider is movably mounted on In the slide groove formed by the pressure strip and the grinding plate, the inclined surface corresponding to the downward angle of the slider is provided with an inclined surface, and is installed in the working cavity. The corresponding inclined surfaces of the two are tightly attached to each other. The guide sleeve is fixedly installed on the movable mold, and the straight ejector rod is movably installed in the guide sleeve. The front end passes through the lower part of the working cavity and is fixedly connected to the straight ejector block, and the rear end is fixedly connected to the ejector plate of the injection molding machine. The locking block corresponding to the locking hole of the slider and the locking boss corresponding to the working cavity are both fixedly installed on the fixed mold of the injection molding machine, and the slider is locked together through the front part of the working cavity 21 of the slider 2 and the locking hole of the slider. The limit block is fixedly installed on the end of the wear-resistant plate part of the movable mold.

[0006] The large downhill core-pulling mechanism for an injection mold is characterized in that the downhill angle is in the range of 30°-50°.

[0007] The injection mold large downhill core pulling mechanism is characterized in that the ejection angle is in the range of 15°-30°.

[0008] The injection mold large downhill core pulling mechanism is characterized in that two guide sleeves are configured, both fixedly mounted on the movable mold, and the straight ejector rod is movably mounted in the two guide sleeves.

[0009] The injection mold large downhill core pulling mechanism is characterized in that it also includes a stop block, which is fixedly installed on the movable mold, and an axial stop groove is opened on the straight push rod corresponding to the stop block, and the end of the stop block is clamped in the stop groove.

[0010] The large downhill core pulling mechanism of the injection mold of the utility model has the advantages of scientific and ingenious design, simple and reasonable structure, stable mechanism movement, good demoulding and core pulling effect, safe and reliable operation, high mass production efficiency and saved manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0012] Figure 1 This is a schematic diagram of the large downhill core pulling mechanism of the injection mold of the utility model;

[0013] Figure 2 for Figure 1 Schematic top view of

[0014] Figure 3 for Figure 2 AA direction cross-sectional view of the state before demoulding and core pulling;

[0015] Figure 4 for Figure 2 AA direction cross-sectional view of the state after demoulding and core pulling;

[0016] Figure 5 for Figure 2 BB partial top view schematic diagram;

[0017] In the figure: 1-wear-resistant plate; 2-slider; 21-working chamber; 22-inclined table (inclined surface); 3-pressing strip; 4-straight ejector block; 5-straight ejector rod; 6-guide sleeve; 7-stop block; 8-locking block; 9-locking boss; 10-limiting block; M-movable mold; P-product; P1-inclined groove; α-downslope angle; β-ejection angle. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described below are only used to explain the present invention. In these descriptions, the keywords that need to be noted include "working chamber", "inclined platform", "inclined step (surface)", "front step surface", "rear step surface", "stop block", "locking boss", "core pulling angle" and "downhill angle", etc., and the present invention uses the large plane of the bottom plate of the injection molding machine (perpendicular to the movement direction of the straight push rod 5) as the reference plane. These are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting the present invention.

[0019] Example 1

[0020] In actual production, Figure 1 and Figure 2 As shown, the injection molded product P in this embodiment is provided with an inclined groove P1, which has an inclined groove angle with the reference surface. In order to demould and pull the core from the inclined groove P1, in this embodiment, the inclined groove angle is 42°, which is actually the downslope angle of the core pulling mechanism of the injection mold of the utility model, that is, the downslope angle α. Figure 3 As shown in FIG. 1 , the large downhill core pulling mechanism of the injection mold of the present invention comprises a wear plate 1, a slider 2, a pressure strip 3, a straight ejector block 4, a straight ejector rod 5, a guide sleeve 6, a locking block 8, a locking boss 9, a limit block 10 and a movable mold M. The movable mold M is provided with an inclined step (surface), and the inclined angle between the inclined step and the reference surface is the ejection angle β. According to the movement condition of the mechanism, it is set to 25° in this embodiment. The inclined step forms a front step surface and a rear step surface, see FIG. Figure 5 As shown, the wear-resistant plate 1 is fixed on the rear step surface of the inclined step of the movable mold M, and the pressure strip 3 is fixed on the front step surface of the inclined step of the movable mold M by screws, forming a slide groove with the wear-resistant plate 1, see Figure 3As shown, the slider 2 is provided with a transparent working chamber 21, which is used to correspond to the straight ejector block 4 and the locking boss 9. A ramp 22 is provided in the working chamber 21. The angle of the ramp 22 is the downslope angle α. The downslope angle α in this embodiment is set to 42°, which is used for demoulding and core pulling from the inclined groove P1 of the product P when in use. A locking hole is also provided. The slider 2 is movably installed in the slide groove formed by the pressure strip 3 and the grinding plate 1. The straight ejector block 4 is provided with an inclined surface corresponding to the downslope angle α set by the slider 2 and is installed in the working chamber 21. The corresponding inclined surfaces of the two are tightly attached to each other. The guide sleeve 6 is fixedly installed on the movable mold M, and the straight ejector rod 5 is movably installed in the guide sleeve 6. The front end passes through the lower part of the working chamber 21 and is fixedly connected to the straight ejector block 4, and the rear end is fixedly connected to the ejector plate of the injection molding machine. This embodiment is equipped with a locking block 8 corresponding to the locking hole of the slider 2 and a locking boss 9 corresponding to the working cavity 21. The locking block 8 and locking boss 9 are fixedly mounted on the fixed mold of the injection molding machine. When the mold is closed for injection, the front of the working cavity 21 of the slider 2 and the locking hole of the slider 2 are respectively used to lock the slider 2, thereby increasing the locking force. The limit block 10 is fixedly mounted on the end of the wear-resistant plate 1 of the movable mold M and is used to limit the sliding movement of the slider 2 during mold opening and core pulling. The downslope angle α of this embodiment is generally within the large downslope angle range of 30-50°, and the ejection angle β is generally within the range of 15-30°.

[0021] When the utility model is used, Figure 3 As shown, the mold is closed, the locking block 8 and the locking boss 9 lock the slider 2, and injection molding is carried out. After the injection molding is completed, the mold is opened, the locking block 8 and the locking boss 9 are removed, and the ejector plate of the injection molding machine pushes the straight ejector rod 5 and the straight ejector block 4. The straight ejector block 4 pushes the slider 2 to slide along the chute formed by the pressure strip 3 and the grinding plate 1 through the inclined surface of the two corresponding to the working chamber 21, and gradually pulls the core out of the inclined groove P1 of the product P. Figure 4 As shown, demoulding is finally completed smoothly. Then, the straight ejector rod 5 is reset along with the ejection plate.

[0022] Example 2

[0023] This embodiment is substantially similar to Embodiment 1, differing in that it further includes a stop block 7, which is fixedly mounted on the movable mold M. An axial stop groove is formed on the straight ejector pin 5, corresponding to the stop block 7. The end of the stop block 7 is engaged in the stop groove to prevent twisting of the straight ejector pin 5 during ejection. Furthermore, to ensure stable movement of the mechanism, two guide sleeves 6 are provided, both fixedly mounted on the movable mold M. The straight ejector pin 5 is movably mounted within these two guide sleeves 6.

[0024] The above description is merely a general embodiment of the present invention. Those skilled in the art will readily appreciate that the present invention may have various modifications and variations, which are not exhaustively described here. However, any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection claimed by the present invention.

Claims

1. A large downhill core pulling mechanism for an injection mold, comprising a wear-resistant plate (1), a slider (2), a pressure strip (3), a straight ejector block (4), a straight ejector rod (5), a guide sleeve (6), a locking block (8), a locking boss (9), a limit block (10) and a movable mold (M), characterized in that: The movable mold (M) is provided with an inclined step, the inclined angle of the inclined step is the ejection angle (β), the inclined step forms a front step surface and a rear step surface, the wear-resistant plate (1) is fixed on the rear step surface of the inclined step of the movable mold (M), the pressure strip (3) is fixed on the front step surface of the inclined step of the movable mold (M), and forms a slide groove with the wear-resistant plate (1), the slider (2) is provided with a transparent working cavity (21), the working cavity (21) is provided with an inclined platform (22), the inclined angle of the inclined surface of the inclined platform (22) is the downslope angle (α), and a locking hole is also provided, the slider (2) is movably installed in the slide groove formed by the pressure strip (3) and the wear plate (1), corresponding to the inclined surface of the downslope angle (α) of the slider (2), the straight ejector block (4 ) is provided with an inclined surface and is installed in the working chamber (21). The corresponding inclined surfaces of the two are tightly attached to each other. The guide sleeve (6) is fixedly installed on the movable mold (M). The straight ejector rod (5) is movably installed in the guide sleeve (6). The front end passes through the lower part of the working chamber (21) and is fixedly connected to the straight ejector block (4). The rear end is fixedly connected to the ejector plate of the injection molding machine. The locking block (8) corresponding to the locking hole of the slider (2) and the locking boss (9) corresponding to the working chamber (21) are both fixedly installed on the fixed mold of the injection molding machine. They respectively pass through the front part of the working chamber (21) of the slider (2) and the locking hole of the slider (2) to jointly lock the slider (2). The limit block (10) is fixedly installed at the end of the wear-resistant plate (1) of the movable mold (M).

2. The injection mold large downhill core pulling mechanism according to claim 1, characterized in that: The downslope angle (α) is in the range of 30°-50°.

3. The injection mold large downhill core pulling mechanism according to claim 1, characterized in that: The ejection angle (β) is in the range of 15°-30°.

4. The injection mold large downhill core pulling mechanism according to claim 1, characterized in that: The guide sleeves (6) are configured in pairs and are both fixedly mounted on the movable mold (M). The straight push rods (5) are movably mounted in the two guide sleeves (6).

5. The injection mold large downhill core pulling mechanism according to claim 1, characterized in that: It also includes a stop block (7), which is fixedly mounted on the movable mold (M), and an axial stop groove is opened on the straight push rod (5) corresponding to the stop block (7), and the end of the stop block (7) is clamped in the stop groove.

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