A one-way drive realizes the demolding structure of inclined roof ejection

Abstract

This invention discloses a demolding structure for unidirectional drive to achieve inclined ejection. It includes a base plate, an ejector pin seat, a vertical ejector pin, an inclined ejector pin, a vertical through hole and an inclined through hole disposed on the mold core. The inclined ejector pin has a clearance opening to accommodate the vertical ejector pin, and the upper end of the clearance opening has a first inclined surface. The top of the vertical ejector pin has an inclined head with an inclination corresponding to the first inclined surface. The ejector pin seat has an inclined groove, and a slider that can move along the inclined groove is installed in the inclined groove. The upper end of the slider is hinged to the bottom of the inclined ejector pin. This invention, relying on the vertical and inclined ejector pins, allows the mold core to detach from the product first, while the ejector pin separates slightly later, reducing the risk of product damage. Simultaneously, the demolding drive relies solely on the relative movement of the mold core and the ejector pin seat. After the mold core detaches from the product, the drive continues, allowing the inclined ejector pin to also detach smoothly, achieving unidirectional drive to successfully complete the entire demolding process.

Description

Technical Field

[0001] This invention relates to the field of injection molding demolding technology, and in particular to a demolding structure that achieves unidirectional drive for inclined ejection. Background Technology

[0002] Injection molding is a method of shaping industrial products. This method typically uses rubber injection molding and plastic injection molding. It uses an upper mold and a lower mold to form a closed injection cavity. After injection molding is completed, the upper mold and the lower mold are separated, and finally the product is removed.

[0003] Currently, existing demolding methods either rely on directly prying the product off with tools, which is only suitable for relatively large injection molded products. For some small injection molded products (such as Bluetooth headphones), directly prying them off with tools can easily damage the product. Another method is to use ejector pins (or angled ejectors). During injection, the top surface of the ejector pin passes through the injection cavity, forming part of the cavity wall with the end face of the ejector pin. This pushes the product back when the upper and lower molds retract, preventing the product from moving with the upper or lower molds, thus achieving automatic demolding. Although this achieves demolding of the product from the upper and lower molds, there is still a connection between the ejector pin and the product support. Manually detaching it is wasteful of manpower. Furthermore, although the contact area of ​​the ejector pin is not too large, for small products, there is still a certain contact area to prevent the product from moving with the upper and lower molds. Therefore, if a hard retraction demolding method is used, there is still a risk of demolding, and it cannot guarantee a smooth product ejection, thus failing to better adapt to automated production.

[0004] Therefore, structural optimization is required for the existing demolding structure. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention aims to provide a demolding structure that achieves unidirectional drive for inclined ejection.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A demolding structure for unidirectional drive to achieve inclined ejection includes a base plate, an ejector pin seat, a vertical ejector pin, an inclined ejector pin, a vertical through hole and an inclined through hole disposed on a mold core. The outlets of the vertical through hole and the inclined through hole are located at the injection end face of the mold core. The vertical ejector pin and the inclined ejector pin are respectively inserted into the vertical through hole and the inclined through hole. The upper part of the inclined ejector pin is provided with a clearance opening to accommodate the vertical ejector pin. The upper end of the clearance opening is provided with a first slope surface. The top of the vertical ejector pin is provided with an inclined head with an inclination corresponding to the first slope surface. The inclined head rests against the clearance opening. The tilting head and the top surface of the tilting rod are both provided with locking protrusions for injection molding. The locking protrusions on the tilting head and the top surface of the tilting rod can be flush with each other to form part of the cavity wall of the injection cavity. The vertical push rod is installed on the push rod seat. The push rod seat is provided with an inclined groove that gradually slopes downward toward the vertical push rod relative to the side on which the vertical push rod is installed. A slider that can move along the inclined groove is installed in the inclined groove. The upper end of the slider is hinged to the bottom of the tilting rod. The push rod seat is fixedly installed on the base plate.

[0008] Preferably, the top rod seat is divided into a first rod seat and a second rod seat. The vertical top rod is installed on the first rod seat, and the inclined sliding groove is provided on the second rod seat. The first rod seat and the second rod seat are positioned by a pin and locked by bolts, wherein the pin is square.

[0009] Preferably, the bottom of the vertical push rod is provided with axial protrusions on both sides, and the top of the first rod seat is provided with a T-shaped fitting port. The bottom of the vertical push rod is inserted from the side of the fitting port, and the axial protrusion is placed in the groove wall of the fitting port. The axial protrusion is cylindrical, so that the vertical push rod can move laterally along the fitting port and can rotate with the axial protrusion as the axis.

[0010] Preferably, the upper end of the slider is provided with a "C"-shaped bayonet, and the bottom of the inclined push rod is provided with a cylindrical bayonet. The bayonet is embedded in the bayonet, so that the inclined push rod and the slider form a hinge.

[0011] Preferably, it further includes at least one auxiliary ejector pin, the upper end of which passes through the mold core and is positioned at the injection end face of the mold core.

[0012] Preferably, the ejector pin seat is further provided with a guide seat, the guide seat is installed on the mold core, and the guide seat is provided with guide holes at corresponding positions of the ejector pin seat and the auxiliary ejector pin, and the guide seat is fixedly installed on the mold core.

[0013] By adopting the above-mentioned scheme, the present invention can rely on the establishment of vertical ejector pins and angled ejector pins to allow the mold core to separate from the product first, while the ejector pins separate one step later, so that the product is not completely demolded at once, reducing the risk of product damage. At the same time, the demolding drive relies solely on the relative movement of the mold core and the ejector pin seat. After the mold core separates from the product, the drive continues along the direction of the ejector pin. This can be combined with the oblique guidance between the vertical ejector pins and the angled ejector pins, the pushing of the angled ejector pins by the oblique through holes, and the movement guidance of the slider and the oblique slide groove, so that the angled ejector pins can also be demolded smoothly, achieving unidirectional drive to successfully complete the entire demolding process. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0015] Figure 2 This is a structural cross-sectional view of an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure between the vertical push rod and the inclined push rod in an embodiment of the present invention.

[0017] Figure 4 This is an exploded view of the top rod seat according to an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] 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 mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0021] like Figures 1 to 4 As shown, this embodiment provides a demolding structure for unidirectional drive to achieve inclined ejection, including a base plate 1, an ejector pin seat 2, a vertical ejector pin 3, an inclined ejector pin 4, a vertical through hole 5 and an inclined through hole 6 disposed on the mold core 100. The outlets of the vertical through hole 5 and the inclined through hole 6 are located at the injection end face of the mold core. The vertical ejector pin 3 and the inclined ejector pin 4 are respectively inserted into the vertical through hole 5 and the inclined through hole 6. The inclined ejector pin 4 is provided with a clearance opening 7 to accommodate the vertical ejector pin 3. The upper end of the clearance opening 7 extends to the top of the inclined ejector pin 4. The upper port of the clearance opening 7 is provided with a first inclined surface 8. The top of the vertical ejector pin 3 is provided with an inclined head 9 with an inclination corresponding to the first inclined surface 8. The inclined head 9 abuts against... At the first ramp surface 8 of the clearance opening 7, and can move relative to each other along the first ramp surface 8, the outer side of the tilting head 9 and the top surface of the tilting rod 4 are provided with locking protrusions for injection molding. The locking protrusions on the tilting head 9 and the locking protrusions on the top surface of the tilting rod 4 can be flush with each other to form part of the cavity wall of the injection cavity. The vertical ejector rod 3 is installed on the ejector rod seat 2. The ejector rod seat 2 is provided with an inclined groove 10 that gradually slopes downward toward the vertical ejector rod 3 relative to the side on which the vertical ejector rod 3 is installed. A slider 11 that can move along the inclined groove 10 is installed in the inclined groove 10. The upper end of the slider 11 is hinged to the bottom of the tilting rod 4. The ejector rod seat 2 is fixedly installed on the base plate 1. It should be noted that the top surface area of ​​the tilting rod 4 is relatively large, occupying about half of the contact area with the product. Therefore, demolding mainly involves demolding the mold core 100 and the tilting rod 4.

[0022] During the demolding process, the entire base plate 1 moves upward, i.e., the ejector pin 2 pushes upward (or the mold core 100 moves downward, because whether the mold core 100 moves downward or the ejector pin 2 pushes upward, it is a relative vertical movement between the two). After the movement, since the vertical ejector pin 3 corresponds to the vertical through hole 5, no matter how it moves up or down, the lateral position of the vertical ejector pin will not change. As for the inclined ejector pin 4, since it corresponds to the inclined through hole 6, when the vertical direction of the mold core 100 and the inclined ejector pin 4 changes, it will push the inclined ejector pin 4 to shift its angle. However, since the other end of the inclined ejector pin 4 is hinged and there is a slider 11 that can move obliquely downward along the oblique slide groove 10, the top of the inclined ejector pin 4 can be adapted to the lifting height, so that the vertical ejector pin 3 and the inclined ejector pin 4 together lift the product, so that the product is demolded from the mold core 100, and the inclined ejector pin 4 and the vertical ejector pin 3 do not demold at first. However, as the slider 11 continues to move, it can no longer move diagonally downwards. At the same time, the diagonal through hole 6 also provides diagonal limitation for the diagonal ejector rod 4. At the top of the diagonal ejector rod 4, the vertical ejector rod 3 also pushes upwards. There is a first inclined surface 8 and a tilting head 9 between the vertical ejector rod 3 and the diagonal ejector rod 4. While the vertical ejector rod 3 and the diagonal ejector rod 4 are pushed up simultaneously, the upper end face of the diagonal ejector rod 4 will rotate diagonally downwards (the other end is hinged to the slider 11 and rotates). The tilting head 9 of the vertical ejector rod 3 will protrude out of the clearance opening 7, so that the end faces of the vertical ejector rod 3 and the diagonal ejector rod 4 are no longer flush, thus allowing the product to be demolded from the diagonal ejector rod 4. Finally, the product can be removed. It should be noted that the locking surface area of ​​the vertical ejector rod 3 is small. Even if the vertical ejector rod 3 is not disengaged, because the surface area is very small, the product can be directly pried apart when picking it up without damaging the product.

[0023] Furthermore, in this embodiment, the top rod seat 2 is divided into a first rod seat 21 and a second rod seat 22. The vertical top rod 3 is installed on the first rod seat 21, and the inclined sliding groove 10 is provided on the second rod seat 22. The first rod seat 21 and the second rod seat 22 are positioned by a pin and secured by bolts, wherein the pin is square. During assembly, the square design of the pin can be used to first determine the height difference between the first rod seat 21 and the second rod seat 22 before tightening, avoiding height tolerances during manual assembly.

[0024] Furthermore, since both the vertical push rod 3 and the inclined push rod 4 have large tops, they cannot be inserted from the bottom upwards. Therefore, to facilitate the installation of the vertical push rod 3 and the inclined push rod 4, the bottom of the vertical push rod 3 in this embodiment is provided with shaft protrusions 31 on both sides. The top of the first rod seat 21 is provided with a "T"-shaped fitting port 23. The bottom of the vertical push rod 3 is inserted from the side of the fitting port 23, and the shaft protrusions 31 are placed in the groove wall of the fitting port 23. The shaft protrusions 31 are cylindrical, so that the vertical push rod 3 can move laterally along the fitting port 23 and rotate around the shaft protrusions 31 as the axis. This design is as follows: Firstly, the shaft protrusion 31 can be inserted into the vertical ejector rod 3 through a horizontal bar, forming shaft protrusions 31 on both sides, so that both the vertical ejector rod 3 and the inclined ejector rod 4 can be inserted from above the mold core. The shaft protrusion 31 on the vertical ejector rod 3 allows it to rotate, mainly to facilitate the direct assembly of the vertical ejector rod 3 and the inclined ejector rod 4. When assembling the two, first place the vertical ejector rod 3 in the clearance opening 7, pass through the mold core, and then grasp the first rod seat 21 to allow the shaft protrusion 31 to be inserted from the assembly opening to complete the assembly smoothly.

[0025] Furthermore, in order to better achieve the hinged connection between the inclined push rod 4 and the slider 11 and to easily complete the assembly, the upper end of the slider 11 in this embodiment is provided with a "C"-shaped bayonet 41, and the bottom of the inclined push rod 4 is provided with a cylindrical bayonet 42. The bayonet 42 is embedded in the bayonet 41, so that the inclined push rod 4 and the slider 11 form a hinge.

[0026] Furthermore, to assist in the support function during ejection, this embodiment also includes at least one auxiliary ejector rod 13. The upper end of the auxiliary ejector rod 13 passes through the mold core 100 and is placed at the injection end face of the mold core 100. During demolding, it is ejected together with the vertical ejector rod 3. The surface area of ​​the auxiliary ejector rod 13 should also be designed to be small, generally the same as or smaller than the surface area of ​​the vertical ejector rod 3 in contact with the product.

[0027] Furthermore, since the ejector pin 2 has a certain height, in order to avoid unnecessary swaying during pushing, the ejector pin 2 in this embodiment is also provided with a guide seat 14. The guide seat 14 is installed on the mold core 100. The guide seat 14 is provided with guide holes at corresponding positions of the ejector pin 2 and the auxiliary ejector pin 13. The guide seat 14 is fixedly installed on the mold core 100, so that it can play a supporting and guiding role during demolding and movement, making the movement more stable.

[0028] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A demolding structure for achieving a slanted ejection by a one-way drive, characterized by: The system includes a base plate, an ejector pin seat, a vertical ejector pin, an angled ejector pin, and vertical and angled through holes disposed on the mold core. The outlets of the vertical and angled through holes are located at the injection end face of the mold core. The vertical and angled ejector pins are respectively inserted into the vertical and angled through holes. The angled ejector pin has a clearance opening on its upper part to accommodate the vertical ejector pin. The upper end of the clearance opening extends to the top of the angled ejector pin. The upper end of the clearance opening has a first slope. The top of the vertical ejector pin has an inclined head with an inclination corresponding to the first slope. The inclined head rests against the first slope of the clearance opening and can... The tilting head and the top surface of the tilting rod are both provided with locking protrusions for injection molding. The locking protrusions on the tilting head and the top surface of the tilting rod can be flush with each other to form part of the cavity wall of the injection cavity. The vertical push rod is installed on the push rod seat. The push rod seat is provided with an inclined groove that gradually slopes downward toward the vertical push rod relative to the side on which the vertical push rod is installed. A slider that can move along the inclined groove is installed in the inclined groove. The upper end of the slider is hinged to the bottom of the tilting rod. The push rod seat is fixedly installed on the base plate.

2. The demolding structure of claim 1, wherein: The top rod seat is divided into a first rod seat and a second rod seat. The vertical top rod is installed on the first rod seat, and the inclined sliding groove is provided on the second rod seat. The first rod seat and the second rod seat are positioned by a pin and locked by bolts. The pin is square.

3. The demolding structure of claim 2, wherein: The vertical push rod has axial protrusions on both sides of its bottom. The top of the first rod seat has a T-shaped fitting port. The bottom of the vertical push rod is inserted from the side of the fitting port, and the axial protrusion is placed in the groove wall of the fitting port. The axial protrusion is cylindrical, so that the vertical push rod can move laterally along the fitting port and can rotate with the axial protrusion as the axis.

4. The demolding structure of claim 3, wherein: The upper end of the slider is provided with a "C"-shaped bayonet, and the bottom of the inclined push rod is provided with a cylindrical bayonet. The bayonet is embedded in the bayonet, so that the inclined push rod and the slider form a hinge.

5. A demolding structure for unidirectional drive to achieve inclined ejection as described in claim 1, characterized in that: It also includes at least one auxiliary ejector pin, the upper end of which passes through the mold core and is positioned at the injection end face of the mold core.

6. The demolding structure of claim 5, wherein: The ejector pin seat is also provided with a guide seat, which is installed on the mold core. The guide seat has guide holes at corresponding positions relative to the ejector pin seat and the auxiliary ejector pin, and the guide seat is fixedly installed on the mold core.

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