A driving inclined roof structure for product inversion

Abstract

The application discloses a driving inclined ejection structure for product reverse buckling, which comprises a bottom plate, a ejector plate, an auxiliary ejection block, a sliding ejector rod, a large inclined ejection, a small inclined ejection, a straight ejection block and corresponding ejection rods, the bottom plate is arranged below the back mold, the ejector plate is arranged above the bottom plate, a T-shaped groove guide block is arranged on the ejector plate, the large inclined ejection is arranged on the back mold, the bottom of the large inclined ejection is provided with an inclined ejection rod, the inclined ejection rod penetrates through the back mold and is provided with a T-shaped sliding block, the T-shaped sliding block is slidably connected in the T-shaped groove of the T-shaped groove guide block, the large inclined ejection is provided with an inclined ejection cavity, the small inclined ejection is arranged in the inclined ejection cavity and is connected to the auxiliary ejection block through the sliding ejector rod, the auxiliary ejection block is arranged in the back mold and is connected to the ejector plate through the ejection rod, the straight ejection block is arranged above the auxiliary ejection block and is connected to the ejector plate through a straight ejection rod. The application has the advantages of simple structure, convenient setting, no occupation of mold space, ensured demolding integrity of the product reverse buckling and improved product quality.

Description

Technical Field

[0001] This invention relates to the field of ejection technology for injection molded products, and specifically to a drive angled ejector structure for product undercutting. Background Technology

[0002] With the rapid development of the plastics industry, all kinds of tools and products used in daily production and life, from large ships and automobiles to small screws and buttons, are closely related to plastic products. Injection molds are important process equipment used to produce various plastic industrial products, and they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic under high pressure into a mold cavity formed by the interlocking of a front mold and a rear mold through an injection molding machine. After cooling and solidification, the molded product is obtained. After the molded product cools and solidifies, it needs to be demolded and ejected. However, during the product manufacturing process, due to the design requirements of the product structure, refer to the instruction manual. Figure 1 As shown, undercuts are often present at specific locations on molded products. The undercuts are formed in the demolding direction, making demolding of the entire product difficult, easily damaging the product, and affecting product quality. Moreover, the product shape in the area shown in the figure has more complex undercuts, and demolding cannot be achieved by a single structure. If conventional technical means are used, multiple forming angled ejectors in multiple directions are required for segmented core pulling demolding, which increases the manufacturing cost of the mold. At the same time, the multiple core pulling angled ejectors in multiple directions also increase the technical difficulty in mold design, making it impossible to simply open and demold, thus affecting production efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing background technology and provide a drive inclined top structure for product inversion.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is: a driving inclined ejector structure for product undercutting, disposed on the rear mold of an injection mold, including a base plate, an ejector plate, an auxiliary ejector block, a large inclined ejector, a small inclined ejector, multiple ejector rods, a sliding ejector rod, a straight ejector block, a T-shaped slider, and a T-slot guide block. The base plate is located directly below the rear mold. The ejector plate is disposed between the rear mold and the base plate, including an ejector plate face and an ejector base plate, with the ejector plate face above the ejector base plate. The large inclined ejector is disposed on the rear mold, with an inclined ejector rod fixedly installed at its bottom. The lower end of the inclined ejector rod passes obliquely downward through the rear mold and is fixedly installed with a T-shaped slider. The T-slot guide block is fixedly installed on the upper surface of the ejector plate face, which has a T-slot. The T-shaped slider is adapted to be installed on the T-slot guide block. The auxiliary ejector block is slidably mounted on the rear mold, with an ejector rod fixedly mounted at its bottom. The lower end of the ejector rod passes downward through the rear mold, ejector plate, and ejector base plate in sequence, and is fixedly mounted on the ejector base plate. The auxiliary ejector block has a sliding cavity, and sliding grooves are symmetrically provided on the two side walls of the sliding cavity. The large inclined ejector has an inclined ejector receiving cavity, and the small inclined ejector is slidably mounted in the inclined ejector receiving cavity. A sliding ejector rod is connected to its rear end. The lower end of the sliding ejector rod is inserted into the sliding cavity of the auxiliary ejector block and is provided with a transverse guide rod. The two ends of the transverse guide rod are slidably mounted in the corresponding sliding grooves. The straight ejector block is located above the auxiliary ejector block, and a straight ejector rod is fixedly mounted at its bottom. The lower end of the straight ejector rod passes downward through the rear mold and is fixedly mounted on the ejector plate.

[0005] Furthermore, the tangent of the auxiliary top block is pentagonal, with the lower part being square; the sliding groove on the auxiliary top block is a two-section bent structure, with an obtuse angle between the two bent sections, and is set obliquely upward.

[0006] Furthermore, there is a clearance fit between the large inclined jack and the sliding jack.

[0007] Furthermore, the bottom of the straight top block is sloped, and its inclination angle is consistent with the top surface of the large sloping top; the bottom of the straight top block is also provided with a top block groove, which is adapted to the top of the auxiliary top block, and the upper right top edge of the auxiliary top block is parallel to the bottom slope of the straight top block.

[0008] Furthermore, the T-slot is sloped, and the bottom surface of the T-slider is in contact with the bottom surface of the T-slot.

[0009] Furthermore, a guide sleeve is provided between the ejector rod of the top block and the rear mold, and the guide sleeve is fixedly installed inside the rear mold.

[0010] Furthermore, the direction in which the inclined ejector rod is set is consistent with the product demolding direction.

[0011] Compared with the prior art, the present invention has the following advantages: The present invention has a simple overall structure, is easy to install and set up, and completes the undercut molding demolding in the demolding direction through two-stage sliding ejection and small inclined ejector, ensuring the integrity of the product and improving the product molding quality; at the same time, the entire structure is set in the rear mold, which does not occupy the overall mold space, reduces the mold cost, and can effectively improve the product demolding efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the molded product for which this invention is intended;

[0013] Figure 2 This is a cross-sectional view of the molded product for which this invention pertains;

[0014] Figure 3 This is a schematic diagram of the overall structure of the present invention (excerpt of the mold);

[0015] Figure 4 This is a structural schematic diagram (excerpt) of the rear mold in this invention;

[0016] Figure 5 This is a schematic diagram of the auxiliary top block in this invention;

[0017] Figure 6 This is a schematic diagram of the large sloping roof structure in this invention;

[0018] Figure 7 This is a schematic diagram of the direct-acting block in this invention;

[0019] Figure 8 This is a diagram showing the fit and connection between the small inclined top, the auxiliary top block, and the straight top block in this invention.

[0020] Figure 9 This is a schematic diagram of the T-slot guide block in this invention;

[0021] Figure 10 This is a schematic diagram of the ejection state one during the operation of the present invention;

[0022] Figure 11 This is a schematic diagram of the ejection state two during the operation of the present invention;

[0023] Figure 12 This is a diagram showing the position of the auxiliary ejector block during the molding and ejection process of the present invention;

[0024] In the diagram: 1. Molded product, 2. Rear mold, 3. Base plate, 4. Ejector plate, 5. Large angled ejector, 6. Small angled ejector, 7. Straight ejector block, 8. Auxiliary ejector block, 9. T-slot guide block, 10. T-slide block, 11. Angled ejector rod, 12. Sliding ejector rod, 13. Ejector block ejector rod, 14. Straight ejector rod, 15. Guide sleeve, 21. Ejection cavity, 22. Ejector block cavity, 41. Ejector plate, 42. Ejector base plate, 51. Angled ejector receiving cavity, 52. Ejection through hole, 71. Ejector block groove, 81. Sliding cavity, 82. Sliding groove, 91. T-slot, 101. Undercut structure, 121. Horizontal guide rod. Detailed Implementation

[0025] 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 of 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.

[0026] Furthermore, the use of terms such as "first" and "second" in the invention is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0027] In the description of this invention, it should 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.

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0029] like Figure 1 and Figure 2As shown, the inner surface of the molded product 1 has multiple undercut structures 101 arranged side by side. The forming direction of the undercut structures 101 is exactly the same as the final ejection direction of the product, making the core-pulling and demolding process relatively complex. The ejection of the undercut structures 101 requires the cooperation of multiple core-pulling components to complete. However, the setting of multiple core-pulling components increases the mold cost. Therefore, the present invention provides a driving inclined ejector structure for product undercuts. The driving inclined ejector structure is set on the rear mold 2 of the injection mold, as shown in the figure. Figure 3 As shown, it includes a base plate 3, an ejector plate 4, a large inclined ejector 5, a small inclined ejector 6, an auxiliary ejector block 8, multiple ejector rods in different positions, a sliding ejector rod 12, a straight ejector block 7, a T-shaped slider 10, and a T-shaped groove guide block 9.

[0030] Combination Figure 4 As shown, the rear mold 2 has a matching ejector cavity 21 at a designated position. The large inclined ejector 5 is slidably installed in the ejector cavity 21. The bottom of the ejector cavity 21 has an ejector rod hole that penetrates the rear mold 2. The right side of the rear mold of the ejector cavity 21 has an ejector block cavity 22. The bottom of the ejector block cavity 22 has a through hole that penetrates the rear mold 2. A guide sleeve 15 is fixedly installed inside the through hole. A downwardly recessed groove is also provided between the ejector block cavity 22 and the ejector cavity 21, connecting the ejector cavity 21 and the ejector block cavity 22. The base plate 3 is located directly below the rear mold 2 and is spaced apart. The ejector plate 4 is located between the rear mold 2 and the base plate 3, including an ejector plate 41 and an ejector base plate 42. The ejector plate 41 is located above the ejector base plate 42. A T-slot guide block 9 is fixedly installed on the upper surface of the ejector plate 41. The T-slot guide block 9 has a T-slot 91, which is combined with... Figure 9 As shown, the T-slot 91 is inclined, with its bottom surface being sloping. A T-slider 10 is slidably installed inside the T-slot 91. The bottom of the T-slider 10 is also sloping, and its inclination angle is consistent with the inclination angle of the bottom surface of the T-slot 91, fitting together. An inclined ejector rod 11 is fixedly installed at the bottom of the aforementioned large inclined ejector 5. The inclined ejector rod 11 passes through the ejector rod hole on the rear mold 2 and extends downward. Its bottom end is fixedly installed at the top of the T-slider 10. The setting direction of the inclined ejector rod 11 is consistent with the product demolding direction.

[0031] Combination Figure 6As shown, the left side of the large inclined top 5 is provided with an inwardly recessed inclined top receiving cavity 51, and the back side of the inclined top receiving cavity 51 is provided with an ejection through hole 52 that penetrates the thickness of the large inclined top 5. The small inclined top 6 is adapted to be installed in the inclined top receiving cavity 51, and there is a product forming gap between it and the large inclined top 5; a sliding ejector rod 12 is connected and installed on the back side of the small inclined top 6, the sliding ejector rod 12 passes through the ejection through hole 52 on the large inclined top 5 and extends out, and there is a clearance fit between the sliding ejector rod 12 and the ejection through hole 52 to provide room for the sliding ejector rod 12 to move; a transverse guide rod 121 is fixedly installed at the lower end of the sliding ejector rod 12, and the transverse guide rod 121 is perpendicular to the sliding ejector rod 12. The auxiliary ejector block 8 is slidably installed in the ejector block cavity 22 on the rear mold 2, and an ejector rod 13 is fixedly installed at its bottom. The lower end of the ejector rod 13 passes through the through hole at the bottom of the ejector block cavity 22, and passes downward through the rear mold 2, the ejector plate 41, and the ejector base plate 42 in sequence, and is fixedly installed on the ejector base plate 42 by a fixing seat and bolts; combined with Figure 5 As shown, the cross-section of the auxiliary top block 8 is pentagonal, with the lower middle part being a right-angled square structure. A recessed sliding cavity 81 is provided on the upper left inclined surface of the auxiliary top block 8. Sliding grooves 82 are symmetrically provided on the front and rear side walls of the sliding cavity 81. Each sliding groove 82 has a two-section bent structure, with an obtuse angle between the two bent sections. The lower end of the aforementioned sliding top rod 12 is inserted into the sliding cavity 81, and the two ends of its bottom transverse guide rod 121 are respectively installed in the sliding grooves 82 on the side walls. (Refer to...) Figure 8 As shown, the small inclined ejector 6 provides guiding support. The straight ejector block 7 is positioned above the auxiliary ejector block 8, and two straight ejector rods 14 are fixedly installed at its bottom. The lower ends of the straight ejector rods 14 pass downward through the rear mold 2 and the ejector panel 41 in sequence, and are fixedly installed on the lower surface of the ejector panel 41; combined with Figure 7 As shown, the lower end face of the straight ejector block 7 is sloped, and the angle of the slope is consistent with the upper top face of the large inclined ejector 5, which makes it easier to make room for the large inclined ejector 5 to pull out the core; the bottom of the straight ejector block 7 is also provided with an ejector slot 71. When the mold is closed, the top of the auxiliary ejector block 8 is just right to be inserted into the ejector slot 71, and the upper right inclined surface of the auxiliary ejector block 8 is parallel to the bottom inclined surface of the straight ejector block 7.

[0032] Combination Figures 10 to 12As shown, the specific working principle is as follows: After the molded product 1 cools and solidifies, the front mold and rear mold 2 complete the mold opening action. Subsequently, the ejector plate 4 simultaneously ejects upward along the guide post, driving the T-slot guide block 9, the ejector rod 13, and the straight ejector rod 14 to eject upward. Due to the restriction of the rear mold 2, the inclined ejector rod 11 ejects upward along the ejector rod hole, while its bottom fixed T-slide block 10 slides downward along the T-slot 91, thereby driving the large inclined ejector 5 to complete the core pulling and demolding action upward and backward. At this time, the auxiliary ejector block 8 and the straight ejector block 7 are also ejected upward under the action of the corresponding ejector rods; at the same time, under the limiting action of the ejector through hole 52 on the large inclined ejector 5, the sliding ejector rod 121 at its bottom end slides upward along the first section of the sliding groove 82, thereby driving the small inclined ejector 6 to eject from the inclined ejector receiving cavity 51 of the large inclined ejector 5, realizing the first demolding of the undercut structure, as shown in the figure. Figure 2 The motion trajectory is shown in the figure. Then, the ejector plate 41 in the ejector plate 4 is ejected upward along the guide post, separating from the ejector base plate 42, which drives the T-slot guide block 9 and the straight ejector rod 14 to be ejected upward. The straight ejector rod 14 drives the straight ejector block 7 to be ejected upward, providing exit space for the large angled ejector 5. At this time, the angled ejector rod 11 is limited by the cooperation of the ejector rod hole and the T-slot 91 on the rear mold 2, which drives the large angled ejector 5 to continue to pull the core upward and backward, while the auxiliary ejector block 8 remains stationary. At this time, the sliding ejector rod 12 is affected by the ejection movement of the large angled ejector 5, and its bottom transverse guide rod 121 begins to slide upward along the second sliding groove 82, thereby driving the small angled ejector 6 to perform a core-pulling movement relative to the molded product 1, completing the second demolding action, so that the undercut structure in the molded product 1 is perfectly removed, and then the product is taken out, completing the demolding. After the product is taken out, it is reset in sequence to perform the next product molding injection.

[0033] The structures mentioned in the above embodiments and their accompanying drawings are all excerpts from a part of a complete mold. Multiple driving inclined ejector structures can be added according to actual processing requirements and the undercut molding position to complete the product molding and demolding. Furthermore, the relevant technical features not mentioned in the above embodiments can be achieved by adopting or referencing existing technologies.

[0034] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A drive angled ejector structure for product undercutting, disposed on the rear mold of an injection mold, characterized in that: The system includes a base plate, an ejector plate, an auxiliary ejector block, a large angled ejector, a small angled ejector, multiple ejector rods, a sliding ejector rod, a straight ejector block, a T-shaped slider, and a T-slot guide block. The base plate is located directly below the rear mold. The ejector plate is positioned between the rear mold and the base plate, and includes an ejector face plate and an ejector base plate, with the face plate positioned above the base plate. The large angled ejector is mounted on the rear mold, with an angled ejector rod fixedly installed at its bottom. The lower end of the angled ejector rod passes diagonally downward through the rear mold and is fixedly mounted with a T-shaped slider. The T-slot guide block is fixedly installed on the upper surface of the ejector face plate, which has a T-slot. The T-shaped slider is fitted into the T-slot. The auxiliary ejector block is slidably mounted on the rear mold, with its bottom fixedly mounted... The auxiliary ejector block has an ejector rod, the lower end of which passes downward through the rear mold, ejector plate, and ejector base plate, and is fixedly installed on the ejector base plate. The auxiliary ejector block has a sliding cavity, and the two side walls of the sliding cavity have symmetrical sliding grooves. The large inclined ejector has an inclined ejector receiving cavity, and the small inclined ejector is slidably installed in the inclined ejector receiving cavity. Its rear end is connected to a sliding ejector rod, the lower end of which is inserted into the sliding cavity of the auxiliary ejector block and is provided with a transverse guide rod. The two ends of the transverse guide rod are slidably installed in the corresponding sliding grooves. The straight ejector block is set above the auxiliary ejector block, and a straight ejector rod is fixedly installed at its bottom. The lower end of the straight ejector rod passes downward through the rear mold and is fixedly installed on the ejector plate. The tangent of the auxiliary top block is pentagonal, with the lower part being square; the sliding groove on the auxiliary top block is a two-section bent structure with an obtuse angle between the two bent sections, and is set obliquely upward.

2. The driving angled top structure for product undercutting according to claim 1, characterized in that: The large inclined jack and the sliding jack are fitted with a clearance.

3. The driving angled top structure for product undercutting according to claim 1, characterized in that: The bottom of the straight top block is sloped, and its inclination angle is consistent with the top surface of the large sloping top. The bottom of the straight top block is also provided with a top block groove, which is adapted to the top of the auxiliary top block. The upper right top edge of the auxiliary top block is parallel to the bottom slope of the straight top block.

4. The driving angled top structure for product undercutting according to claim 1, characterized in that: The T-slot is sloped, and the bottom surface of the T-slide block is in contact with the bottom surface of the T-slot.

5. The driving angled top structure for product undercutting according to claim 1, characterized in that: A guide sleeve is provided between the ejector rod of the top block and the rear mold, and the guide sleeve is fixedly installed inside the rear mold.

6. The driving angled top structure for product undercutting according to claim 1, characterized in that: The angled ejector rod is positioned in the same direction as the product demolding direction.

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