A secondary mold opening mechanism for upside down product

Abstract

The application discloses a secondary mold opening mechanism for upside-down buckling of products, which comprises a fixed mold, an ejection plate, a large inclined ejector and a small inclined ejector. The fixed mold is provided with an ejection cavity, and the large inclined ejector is slidably arranged in the ejection cavity. The ejection plate is arranged below the fixed mold, and the upper surface of the ejection plate is provided with a groove, and a reverse T-shaped groove is arranged in the groove. A T-shaped sliding block is slidably arranged in the reverse T-shaped groove, and the bottom end of the large inclined ejector is fixedly arranged on the T-shaped sliding block. The upper half of the large inclined ejector is provided with a small inclined ejector sliding through hole penetrating through the upper and lower portions of the large inclined ejector, and the small inclined ejector is slidably arranged in the small inclined ejector sliding through hole. The bottom end of the small inclined ejector is connected to a small ejection plate, the small ejection plate is transversely arranged in the middle of the two legs of a U-shaped structure of the lower half of the large inclined ejector, and the small ejection plate is fixed to the corresponding bottom of the fixed mold. Through the twice relative movement between the inclined ejectors, the demolding of the upside-down buckling of the inner side of the product is realized, the upside-down buckling of the rib position is prevented from being adhered to the inclined ejector and inconveniently taken out, the integrity of the product is ensured, and the product forming quality is improved.

Description

Technical Field

[0001] This invention relates to the field of injection mold forming and demolding technology, specifically to a secondary mold opening mechanism for undercutting on products. Background Technology

[0002] With societal development, plastic products have emerged, leading to the significant development of injection molds for producing these products. Injection molds are crucial process equipment in the production of various plastic industrial products, serving as tools that give plastic products their complete structure and precise dimensions. However, due to different application scenarios, the design structures of various plastic products also differ. Figure 1 The product shown has several undercut ribs on its inner side. One of the locations has a relatively narrow space, but multiple undercut ribs are spaced apart there. The spacing between adjacent undercuts is small. When demolding using the traditional one-time demolding method, the demolding resistance of the mold increases. The molded undercuts are easy to stick to the inclined ejector and are difficult to remove. This can easily cause friction damage to the product and the inclined ejector, thereby affecting the product molding quality, increasing production costs, and affecting the production efficiency of the entire injection molding industry's automation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing background technology and provide a secondary mold opening mechanism for undercutting on products.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a secondary mold opening mechanism for undercutting on a product, comprising a fixed mold, an ejector plate, a large inclined ejector, and a small inclined ejector. The fixed mold is provided with an ejection cavity, and the large inclined ejector is slidably installed in the ejection cavity. The upper end of the large inclined ejector is provided with an undercutting forming groove, which is adapted to the product forming cavity above the fixed mold. The ejector plate is located directly below the fixed mold, and its upper surface is provided with a groove. An inverted T-shaped groove is fixedly installed in the groove, and a T-shaped slider is slidably installed in the inverted T-shaped groove. The bottom end of the large inclined ejector is fixedly installed on the T-shaped slider. The lower half of the large inclined top is arranged in an inverted U-shape, and the upper half of the large inclined top is provided with a small inclined top sliding through hole that runs through it from top to bottom. The small inclined top is slidably installed in the corresponding small inclined top sliding through hole. The top of the small inclined top is flush with the top of the large inclined top, and it is also provided with an undercut forming groove, which is adapted to and connected with the undercut forming groove on the large inclined top. The bottom end of the small inclined top is connected to the small ejector plate. The small ejector plate is horizontally accommodated between the two legs of the U-shaped structure of the lower half of the large inclined top and is fixedly installed at the bottom of the corresponding fixed mold. The bottom surface of the small ejector plate is flush with the bottom surface of the fixed mold.

[0005] Further, the small ejection plate comprises an upper ejection plate and a lower ejection plate, wherein the upper surface and the lower surface of the lower ejection plate are provided with an included angle of 10-15°, the upper ejection plate is installed on the upper surface of the lower ejection plate and is attached to the lower ejection plate, the upper ejection plate is provided with a ejection rod through hole, the width of the ejection rod through hole is greater than the ejection rod below the small inclined ejection, and the ejection rod can swing in the ejection rod through hole; the bottom side of the ejection rod is provided with a limiting column which is relatively parallel.

[0006] Further, the bottom of the fixed mold upper ejection cavity is provided with a small ejection plate accommodating cavity, and the small ejection plate is fixedly installed in the small ejection plate accommodating cavity of the fixed mold through a countersunk head bolt.

[0007] Further, the large inclined ejection and the small inclined ejection are provided in an inclined manner, the inclined angles of the two are consistent, and the inclined angles are adapted to the molding of the upside down buckle of the product, and the large inclined ejection and the small inclined ejection are provided with an included angle of 60° between the upper surface of the ejection plate.

[0008] Further, the side wall of the large inclined ejection is provided with a brass oiling groove on the contact surface with the fixed mold, and the brass oiling groove is internally filled with butter.

[0009] Further, the ejection plate is provided with a ejector pin plate and a bottom plate below the ejection plate, the ejection plate and the bottom plate are connected through a supporting block, and the ejector pin plate is arranged between the ejection plate and the bottom plate; the ejector pin plate comprises an ejector pin surface plate and an ejector pin bottom plate, and the ejector pin bottom plate is installed at the bottom of the ejector pin surface plate.

[0010] Compared with the prior art, the present application has the following beneficial effects: the present application realizes the demolding process of the upside down buckle of the product inside the middle product through the relative movement of the inclined ejections twice, reduces the demolding resistance between the mold and the product, prevents the upside down buckle from being adhered to the inclined ejection and being difficult to take out, ensures the integrity of the product, improves the product molding quality, and improves the production efficiency of the injection molding. Figure 1 BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The present application is aimed at the structure of the molded product;

[0012] Figure 2 The present application is aimed at the structure of the molded product;

[0013] Figure 3 The present application is aimed at the structure of the molded product;

[0014] Figure 4 The present application is aimed at the structure of the molded product;

[0015] Figure 5 The present application is aimed at the structure of the molded product;

[0016] Figure 6 ​This is a schematic diagram of the large sloping roof structure in this invention;

[0017] Figure 7 This is a schematic diagram of the small sloping top structure in this invention;

[0018] In the diagram: 1. Molded product, 2. Fixed mold, 3. Ejector plate, 4. Large angled ejector, 5. Small angled ejector, 6. Ejector rod, 7. Small ejector plate, 8. Base plate, 9. Ejector pin plate, 10. Support block, 11. Rib undercut, 12. Positioning end block, 13. Limiting post, 21. Ejector cavity, 22. Small ejector plate receiving cavity, 31. Groove, 32. Inverted T-slot, 33. T-slider, 41. Support leg, 42. Small angled ejector sliding through hole, 43. Undercut molding groove, 71. Upper ejector plate, 72. Lower ejector plate. Detailed Implementation

[0019] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only used to facilitate the description of the structural relationship between the components in this invention and do not specifically mean that any component in this invention must have a specific orientation, be constructed and operated in a specific orientation, or be construed as a limitation of this invention.

[0020] It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0022] Figure 1 The structure of the molded product 1 shown is designed according to actual usage requirements. As shown in part A of the figure, multiple undercuts 11 are arranged in a relatively narrow space. The spacing between two adjacent undercuts 11 is small, making it easy for the undercuts 11 to stick to the molding die, resulting in high demolding resistance. Therefore, this invention proposes a secondary mold opening mechanism for undercuts on products. This secondary mold opening mechanism is set on the fixed mold side of the injection mold, combined with... Figures 2 to 5 As shown, it includes a fixed mold 2, an ejector plate 3, a large angled ejector 4, and a small angled ejector 5. The fixed mold 2 is a punch, and an ejector cavity 21 is provided through the top and bottom of the fixed mold 2 at the position where the undercut 11 is formed on the upper rib of the product. The large angled ejector 4 is slidably installed in the ejector cavity 21, and an undercut forming groove 43 corresponding to the undercut 11 is provided at the top of the large angled ejector 4; combined with Figure 6As shown, the lower half of the large inclined top 4 is provided in an inverted U-shaped structure, with a hollow in the middle, and a brass oil groove is provided on the two legs 41 of the inverted U-shaped structure, around the outer side wall in contact with the fixed mold 2, and butter is injected into the brass oil groove to reduce relative friction and prevent wear and tear, facilitating the sliding of the large inclined top 4 in the fixed mold 2. The upper half of the large inclined top 4 is provided with a small inclined top sliding hole 42 extending through its upper and lower dimensions, with its central axis parallel to the central axis of the large inclined top 4, and the small inclined top 5 is installed in the corresponding small inclined top sliding hole 42, and the top end face is also provided with an inverted buckle forming groove 43, which cooperates with the inverted buckle forming groove 43 provided on the large inclined top 4 to complete the forming of the entire rib position inverted buckle 11; in combination Figure 7 As shown, the bottom of the small inclined top 5 is fixedly connected to an ejection rod 6, and the lower end of the ejection rod 6 is connected to a small ejection plate 7, which includes an upper ejection plate 72 and a lower ejection plate 71, wherein the extension surface of the upper top surface of the lower ejection plate 71 has an included angle of 10°-15° with the extension surface of its lower top surface, and the upper ejection plate 72 is fixedly installed above the upper top surface of the lower ejection plate 71 and is attached thereto. The structure is arranged so that the bottom surface of the small ejection plate 7 is flush with the upper surface of the ejection plate 3, and the top end face of the small ejection plate 7 is parallel to the horizontal section of the lower half of the inverted U-shaped structure of the large inclined top 4; the small ejection plate 7 is laterally accommodated between the two legs 41 of the inverted U-shaped structure of the large inclined top 4, and is fixedly installed in the small ejection plate accommodating cavity 22 at the bottom end of the ejection cavity 21 in the fixed mold 2 by means of a countersunk head bolt, and the bottom surface of the small ejection plate 7 is flush with the bottom surface of the fixed mold 2, as shown in Figure 4 As shown, the small ejection plate 7 is provided with a top rod through hole on the upper ejection plate 72, and the front and rear width of the top rod through hole is greater than the width of the ejection rod 6, and the bottom end of the ejection rod 6 passes through the upper ejection plate 72 from top to bottom and is hinged in the top rod through hole, so that the ejection rod 6 can swing relatively in the top rod through hole; a limiting column 13 is provided beside the bottom end of the ejection rod 6, which is parallel to the limiting column 13, to control the swing angle of the ejection rod 6 and the ejection distance of the small inclined top 5. A positioning end block 12 is also provided on the ejection rod 6, which is fixedly installed at the bottom end of the small inclined top sliding hole 42 of the large inclined top 4 by means of a countersunk head bolt, and the ejection rod 6 can slide in the positioning end block 12, and the positioning end block 12 serves as a limit to the sliding position of the ejection rod 6.

[0023] The ejection plate 3 is located directly below the fixed mold 2, and the upper surface thereof is provided with a groove 31 corresponding to the ejection cavity 21 of the fixed mold 2. A reverse T-shaped groove 32 is fixedly installed in the groove 31, and a T-shaped sliding block 33 matched with the reverse T-shaped groove 32 is slidingly installed on the reverse T-shaped groove 32. The bottom end of the large inclined ejector pin 4 is fixedly installed on the upper surface of the T-shaped sliding block 33. The large inclined ejector pin 4 and the small inclined ejector pin 5 are arranged obliquely relative to the ejection plate 3, and the inclination angles of the two are consistent, so as to adapt to the molding position of the rib position reverse buckle 11 of the molded product 1. Further, the large inclined ejector pin 4 and the small inclined ejector pin 5 are arranged at an angle of 60° with the upper surface of the ejection plate 3.

[0024] The bottom of the ejection plate 3 is provided with a pin plate 9 and a bottom plate 8. The ejection plate 3 and the bottom plate 8 are connected through two support blocks 10, and the pin plate 9 is arranged between the ejection plate 3 and the bottom plate 8. The pin plate 9 includes a pin surface plate and a pin bottom plate. The pin bottom plate is installed at the bottom of the pin surface plate, and a plurality of pins are arranged on the pin surface plate for ejection demolding of the product.

[0025] When the fixed mold 2 and the movable mold are relatively buckled, the upper end surface of the small inclined ejector pin 5 is flush with the top end surface of the large inclined ejector pin 4, the reverse buckle molding groove 43 is matched with the product molding cavity, and then injection molding is performed. After the product is cooled and molded, demolding is started. First, the pin plate 9 and the pins installed on the pin plate 9 cooperate to eject, so as to realize the ejection action of the entire molded product 1. Then, the large inclined ejector pin 4 performs a core pulling action backward, slides backward along the reverse T-shaped groove 32, and because the small ejection plate 7 is fixedly connected with the fixed mold 2, the small ejection plate 7 does not move relative to the fixed mold 2 at this time, and the small inclined ejector pin 5 is ejected upward relative to the large inclined ejector pin 4. The two are relatively slid, and the first demolding of the rib position reverse buckle 11 of the molded product 1 is completed. Then, because the large inclined ejector pin 4 slides backward to pull the core, the fixed positioning end block 12 fixedly installed on the large inclined ejector pin 4 moves synchronously, the ejection rod 6 is blocked and limited by the positioning end block 12 to be inclined, the limiting column 13 beside the bottom end of the ejection rod 6 is synchronously inclined with the inclination of the bottom of the small inclined ejector pin 5, and when the inclination angle reaches the vertical position of the hinge part between the limiting column 13 and the bottom end of the ejection rod 6, the ejection rod 6 is limited, and then the large inclined ejector pin 4 is synchronously core-pulled, and the second demolding of the rib position reverse buckle 11 of the molded product 1 is completed.

[0026] The fixed mold 2 can complete injection molding and ejection demolding of two molded products 1 at a time. Correspondingly, two sets of the secondary mold opening mechanisms are arranged in the fixed mold 2, and the two sets of secondary mold opening mechanisms are arranged symmetrically relative to the longitudinal center line of the fixed mold 2. The embodiment is described on one side.

[0027] The technical features not mentioned in the related technical solutions described in the above embodiment can be realized by using or referring to the conventional technical means in the prior art.

[0028] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the spirit and scope of the present application should also be included in the protection scope of the present application.

Claims

1. A secondary mold opening mechanism for upside down product ejection, characterized by: The utility model relates to a product ejection mechanism, including fixed mould, ejection plate, big slope and small slope, be equipped with ejection cavity on fixed mould, big slope sliding installation is in ejection cavity, and the upper end of big slope is equipped with inverted buckle forming groove, and is adapted with product forming cavity above fixed mould, the upper surface of ejection plate is located in the right below fixed mould, and is equipped with recess, and recess is fixedly installed with inverted T groove, and T slide is slidingly installed in inverted T groove, and the bottom of big slope is fixedly installed on T slide, the lower half of big slope is inverted U type setting, and the upper half of big slope is equipped with the small slope sliding through hole of passing through its upper and lower, and small slope sliding is installed in the small slope sliding through hole, and the top of small slope is flush with the top of big slope, and is also equipped with inverted buckle forming groove on the top of small slope, and is adapted with inverted buckle forming groove of big slope and communicates, the bottom of small slope is connected to small ejection plate, and small ejection plate is laterally accommodated in the two legs of the U type structure of the lower half of big slope and is fixedly installed in the corresponding fixed mould bottom, and the bottom surface of small ejection plate is flush with the bottom surface of fixed mould. The small ejection plate includes an upper ejection plate and a lower ejection plate, wherein the upper top surface and the lower top surface of the lower ejection plate have an included angle of 10°-15°, the upper ejection plate is installed on the upper top surface of the lower ejection plate and is attached thereto, the upper ejection plate is provided with a top rod through hole, the width of the top rod through hole is greater than that of the ejection rod below the small slope, and the ejection rod can swing relatively in the top rod through hole, and the bottom side of the ejection rod is provided with relatively parallel limiting columns.

2. A mechanism for secondary mold opening for product on-dumping according to claim 1, characterized in that: The bottom of the ejection cavity of the fixed mould is provided with a small ejection plate accommodating cavity, and the small ejection plate is fixedly installed in the small ejection plate accommodating cavity of the fixed mould through a countersunk head bolt.

3. A mechanism for secondary mold opening for product on-dumping according to claim 1, characterized in that: The big slope and the small slope are inclined, the inclination angles of the big slope and the small slope are consistent, and the big slope and the small slope are adapted to the inverted buckle forming of the product, and the big slope and the small slope are arranged at an included angle of 60° with the upper surface of the ejection plate.

4. A mechanism for secondary mold opening for product on-dumping according to claim 1, characterized in that: The side wall of the big slope is provided with a brass oiling groove on the contact surface with the fixed mould, and butter is injected into the brass oiling groove.

5. A mechanism for secondary mold opening for product on-dumping according to claim 1, characterized in that: A thimble plate and a bottom plate are arranged below the ejection plate, the ejection plate and the bottom plate are connected through a support block, and the thimble plate is arranged between the ejection plate and the bottom plate, the thimble plate includes a thimble face plate and a thimble bottom plate, and the thimble bottom plate is installed at the bottom of the thimble face plate.

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