A demolding mechanism for a bottle cap with a relatively deep internal undercut

Abstract

The present invention provides a demolding mechanism for a bottle cap with a relatively deep internal undercut, which includes a first slider assembly, a first push plate, a second slider assembly, a second push plate and a stripper. The first slider assembly is fixedly connected to the first push plate, the second slider assembly is fixedly connected to the second push plate, and the first push plate is detachably connected to the second push plate. The bottle cap is injection molded on the top of the stripper. The first slider assembly, the second slider assembly and the stripper cooperate with each other. A demolding ejector rod is provided in the injection molding machine, and the demolding ejector rod is drivingly connected to the first push plate. The demolding ejector rod can drive the first push plate to move, drive the second push plate to move, and then drive the first slider assembly to contract and the second slider assembly to contract. Moreover, after the first push plate and the second push plate are separated, it can continue to drive the first slider assembly to contract to complete the demolding operation of the bottle cap. The beneficial effect of the present invention is that it can realize segmented ejection to complete the demolding operation of the bottle cap, improving the stability of product quality and product competitiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of precision manufacturing equipment, and particularly relates to a demolding mechanism for a bottle cap with a relatively deep internal undercut. Background Art

[0002] A demolding mechanism is a mechanical device that separates a plastic part from a manufacturing mold. During injection molding, plastic parts with lateral protrusions or grooves are often encountered. When the size of the protrusion or lateral groove is large, a lateral core-pulling mechanism is generally required to demold the plastic part. When the size of the protrusion or lateral groove is small, forced demolding can be achieved by the elastic deformation of the plastic part. To facilitate the demolding of plastic products and prevent scratching the surface of the products during demolding, the surface of the plastic part parallel to the demolding direction should generally have a reasonable demolding slope.

[0003] Due to certain requirements for aesthetics and practicality, many bottle caps have a design with a relatively deep internal undercut, and some bottle caps even have an internal undercut design throughout the entire circumference. Currently, there are usually two demolding methods for such plastic part products.

[0004] One demolding method is to use a slider + angled lifter combined structure for demolding. The specific implementation method is generally that the ejector plate ejects. The latch mechanism drives the push plate to move together for 20 mm. The lifter is fixed on the support plate and drives 4 internal sliders to retract backward by 5 mm. Then the ejector plate continues to eject by 60 mm and drives the angled lifter to retract backward by 7 mm. This method increases the spacer block and ejector plate because an angled lifter needs to be made, and the mold thickness will be much larger. There are also many accessories related to the angled lifter, such as angled lifter guide blocks, angled lifter seats, etc. If a multi-cavity product is made, the mold layout will be very large, resulting in an increase in the cost of the mold, and the matching injection molding machine will also become larger, and the subsequent injection molding production cost will increase synchronously.

[0005] Another demolding method is to use an explosion buckle for demolding. All sliders are installed on one layer of the template, and all internal sliders are synchronously retracted inward by one lifter. There are fewer parts and the space is compact. However, the backward stroke of the slider is limited. Generally, it can only demold an undercut within 5 mm. If the inner hole of the product is small, the retraction stroke will be even more cramped. In the field of bottle caps, most of the internal undercuts of bottle caps exceed 5 mm, and due to the need for a certain safety distance, the slider needs to retract more than 8 mm. Therefore, the explosion buckle demolding method is difficult to apply to bottle caps. Summary of the Invention

[0006] To solve the problems in the prior art, the present invention provides a demolding mechanism for a bottle cap with a relatively deep internal undercut. By arranging a first slider assembly, a first push plate, a second slider assembly, a second push plate and a stripper in the demolding mechanism of the bottle cap with a relatively deep internal undercut, the demolding ejector rod can drive the first push plate to move, drive the second push plate to move, and then drive the first slider assembly and the second slider assembly to contract. And it can continue to drive the first push plate to move and drive the first slider assembly to contract to complete the demolding operation of the bottle cap after the first push plate and the second push plate are separated, improving the stability of product quality and product competitiveness, greatly reducing the overall size of the mold, and solving the problems of large volume, high cost and difficulty in adopting the explosion-proof demolding method in the prior art of the bottle cap demolding mechanism.

[0007] A demolding mechanism for a bottle cap with a relatively deep internal undercut provided by the present invention includes a first slider assembly, a first push plate, a second slider assembly, a second push plate and a stripper. The first slider assembly is fixedly connected to the first push plate, the second slider assembly is fixedly connected to the second push plate, the first push plate and the second push plate are detachably connected. The bottle cap is injection-molded on the top of the stripper. The first slider assembly, the second slider assembly and the stripper cooperate with each other. A demolding ejector rod is arranged in the injection molding machine, and the demolding ejector rod is drivingly connected to the first push plate. The demolding ejector rod can drive the first push plate to move, drive the second push plate to move, and then drive the first slider assembly and the second slider assembly to contract, and can continue to drive the first push plate to move and drive the first slider assembly to contract to complete the demolding operation of the bottle cap after the first push plate and the second push plate are separated.

[0008] The present invention is further improved. The first slider assembly includes 4 cooperating T-shaped sliders. The 4 T-shaped sliders are respectively detachably connected to the first push plate. The 4 T-shaped sliders are arranged around the stripper and cooperate with the stripper.

[0009] The present invention is further improved. The second slider assembly includes 4 cooperating straight sliders. The 4 straight sliders are respectively detachably connected to the second push plate. The 4 straight sliders are arranged around the stripper and cooperate with the stripper.

[0010] The present invention is further improved. A latch is arranged between the first push plate and the second push plate, and the first push plate and the second push plate are snap-connected through the latch.

[0011] The present invention is further improved and further includes a bottom plate. The bottom of the stripper is fixedly arranged on the bottom plate. The first push plate is slidably connected to the bottom plate, and the second push plate is slidably connected to the bottom plate.

[0012] The present invention is further improved, and the demolding ejector rod is driven by a hydraulic drive cylinder or a drive motor.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a demolding mechanism for a bottle cap with a relatively deep internal undercut. By arranging a first slider assembly, a first push plate, a second slider assembly, a second push plate, and a lifter that cooperate with each other in the demolding mechanism of the bottle cap with a relatively deep internal undercut, the demolding ejector rod can drive the first push plate to move, drive the second push plate to move, and then drive the first slider assembly to contract and the second slider assembly to contract. Moreover, after the first push plate and the second push plate are separated, it can continue to drive the first push plate to move and drive the first slider assembly to contract to complete the demolding operation of the bottle cap. By installing the first slider assembly on the first push plate and the second slider assembly on the second push plate, it is possible to achieve segmented ejection to complete the demolding operation of the bottle cap, without causing damage to the bottle cap, improving the stability of product quality and product competitiveness. It not only achieves the demolding effect of the traditional slider + inclined ejector demolding structure but also greatly reduces the overall size of the mold, solving the problems of large volume, high cost, and difficulty in using the explosion-proof demolding method in the prior art for the bottle cap demolding mechanism. Description of the Drawings

[0014] In order to more clearly illustrate the solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a sectional view structure diagram of the demolding mechanism of the bottle cap with a relatively deep internal undercut of the present invention;

[0016] Figure 2 It is a sectional view structure diagram of the demolding mechanism of the bottle cap with a relatively deep internal undercut of the present invention;

[0017] Figure 3 It is a sectional view structure diagram of the demolding mechanism of the bottle cap with a relatively deep internal undercut of the present invention.

[0018] In the figure, 1 - first slider assembly, 11 - T-shaped slider, 2 - first push plate, 3 - second slider assembly, 31 - straight plate slider, 4 - second push plate, 5 - lifter, 6 - demolding ejector rod, 7 - latch, 8 - bottom plate. Detailed Embodiments

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0020] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0021] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0022] As Figures 1 - 3 shown, a demolding mechanism for a bottle cap with a relatively deep internal undercut provided by the present invention includes a first slider assembly 1, a first push plate 2, a second slider assembly 3, a second push plate 4, and a lifter 5. The first slider assembly 1 is fixedly connected to the first push plate 2, the second slider assembly 3 is fixedly connected to the second push plate 4, the first push plate 2 is detachably connected to the second push plate 4. The bottle cap is injection molded on the top of the lifter 5. The first slider assembly 1, the second slider assembly 3, and the lifter 5 cooperate with each other. A demolding ejector rod 6 is provided in the injection molding machine, and the demolding ejector rod 6 is drivingly connected to the first push plate 2. In this embodiment, the demolding ejector rod can drive the first push plate to move, drive the second push plate to move, and then drive the first slider assembly to contract and the second slider assembly to contract. Moreover, after the first push plate and the second push plate are separated, it can continue to drive the first push plate to move and drive the first slider assembly to contract to complete the demolding operation of the bottle cap. By installing the first slider assembly on the first push plate and the second slider assembly on the second push plate, it is possible to achieve segmented ejection to complete the demolding operation of the bottle cap, without damaging the bottle cap, improving the stability of product quality and product competitiveness. It not only achieves the demolding effect of the traditional slider + angled ejector demolding structure, but also greatly reduces the overall size of the mold.

[0023] As Figures 1 - 3As shown in the figure, the first slider assembly 1 includes four cooperating T-shaped sliders 11. The four T-shaped sliders 11 are respectively detachably connected to the first push plate 2. The four T-shaped sliders 11 are arranged around the shoveling machine 5 and cooperate with the shoveling machine 5. The second slider assembly 3 includes four cooperating straight plate sliders 31. The four straight plate sliders 31 are respectively detachably connected to the second push plate 4. The four straight plate sliders 31 are arranged around the shoveling machine 5 and cooperate with the shoveling machine 5. A buckle 7 is provided between the first push plate 2 and the second push plate 4. The first push plate 2 and the second push plate 4 are snap-connected through the buckle 7. It further includes a bottom plate 8. The bottom of the shoveling machine 5 is fixedly arranged on the bottom plate 8. The first push plate 2 is slidably connected to the bottom plate 8, and the second push plate 4 is slidably connected to the bottom plate 8. The demolding ejector rod 6 is driven by a hydraulic drive cylinder or a drive motor. In this embodiment, after the injection molding, cooling and shaping are completed on the outer surface of the shoveling machine of the bottle cap, the demolding mechanism of the bottle cap with a relatively deep internal undercut starts to work. The demolding ejector rod pushes the first push plate forward. Since the first push plate and the second push plate are connected by a buckle, the first push plate and the second push plate move forward synchronously by 20 mm. At this time, the first slider assembly and the second slider assembly contract inward at the same time. After the buckle is disengaged, the second push plate stops, and the second slider assembly no longer contracts inward. The first push plate continues to move forward by 60 mm. At this time, the first slider assembly continues to contract inward, and the bottle cap can be easily pushed out and detached, completing the entire demolding operation of the bottle cap.

[0024] As can be seen from the above, the present invention provides a demolding mechanism for a bottle cap with a relatively deep internal undercut. By arranging a first slider assembly, a first push plate, a second slider assembly, a second push plate and a shoveling machine that cooperate with each other in the demolding mechanism of the bottle cap with a relatively deep internal undercut, the demolding ejector rod can drive the first push plate to move, drive the second push plate to move, and then drive the first slider assembly and the second slider assembly to contract inward. Moreover, after the first push plate and the second push plate are separated, it can continue to drive the first push plate to move and drive the first slider assembly to contract inward to complete the demolding operation of the bottle cap. By installing the first slider assembly on the first push plate and the second slider assembly on the second push plate, it can realize segmented ejection to complete the demolding operation of the bottle cap, without damaging the bottle cap, improving the stability of product quality and product competitiveness. It not only achieves the demolding effect of the traditional slider + inclined ejector demolding structure, but also greatly reduces the overall size of the mold, solving the problems of large volume, high cost and difficulty in using the explosion-proof demolding method in the existing bottle cap demolding mechanism.

[0025] The above-mentioned specific implementation manners are the preferred implementation manners of the present invention, and do not limit the specific implementation scope of the present invention by this. The scope of the present invention includes but is not limited to this specific implementation manner. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A demoulding mechanism for a bottle cap with a relatively deep internal undercut, which is arranged on an injection molding machine for the bottle cap, and is characterized in that: It includes a first slider assembly, a first push plate, a second slider assembly, a second push plate and a stripper. The first slider assembly is fixedly connected to the first push plate, the second slider assembly is fixedly connected to the second push plate, the first push plate is detachably connected to the second push plate, and the bottle cap is injection-molded on the top of the stripper. The first slider assembly, the second slider assembly and the stripper cooperate with each other. There is a demolding ejector rod in the injection molding machine, and the demolding ejector rod is drivingly connected to the first push plate. The demolding ejector rod can drive the first push plate to move forward and drive the second push plate to move forward synchronously by 20 mm. At this time, the first slider assembly and the second slider assembly contract inward simultaneously. After the first push plate and the second push plate are separated, the second push plate stops, and the second slider assembly no longer contracts inward. The demolding ejector rod can drive the first push plate to continue to move forward by 60 mm. At this time, the first slider assembly continues to contract inward to complete the demolding operation of the entire bottle cap.

2. The demolding mechanism of the bottle cap with a relatively deep internal undercut according to claim 1, characterized in that: The first slider assembly includes 4 cooperating T-shaped sliders. The 4 T-shaped sliders are respectively detachably connected to the first push plate. The 4 T-shaped sliders are arranged around the stripper and cooperate with the stripper.

3. The demolding mechanism of the bottle cap with a relatively deep internal undercut according to claim 2, characterized in that: The second slider assembly includes 4 cooperating straight sliders. The 4 straight sliders are respectively detachably connected to the second push plate. The 4 straight sliders are arranged around the stripper and cooperate with the stripper.

4. The demolding mechanism of the bottle cap with a relatively deep internal undercut according to claim 3, characterized in that: There is a latch between the first push plate and the second push plate. The first push plate and the second push plate are snap-connected through the latch.

5. The demolding mechanism of the bottle cap with a relatively deep internal undercut according to claim 4, characterized in that: It further includes a bottom plate. The bottom of the stripper is fixedly arranged on the bottom plate. The first push plate is slidably connected to the bottom plate, and the second push plate is slidably connected to the bottom plate.

6. The demoulding mechanism of the bottle cap with a relatively deep internal undercut according to claim 5, characterized in that: The demolding ejector rod is driven by a hydraulic drive cylinder or a drive motor.

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