Ejection venting structure for a mold

Abstract

The utility model discloses a kind of ejection exhaust structure for mould, comprising: ejection and mould core, ejection includes top block and ejector rod, one end of ejector rod is connected with top block;Mould core is provided with accommodating cavity and empty hole on it, top block is located in accommodating cavity, ejector rod is located in empty hole, and there is formed with empty space gap between ejector rod and empty hole;Mould core is also provided with exhaust hole and exhaust groove, one end of exhaust hole is communicated with accommodating cavity, and exhaust groove is connected between empty space gap and exhaust hole.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to an ejection and venting structure for molds. Background Technology

[0002] In injection molding, the venting performance of the mold directly affects product quality and production efficiency. Common venting solutions in injection molds mainly rely on independent venting inserts. However, venting inserts require additional mold space, complicating the mold structure and increasing processing and assembly difficulties. This is especially true for products that require ejector blocks as ejection structures. Because ejector blocks occupy a large area of ​​the mold cavity, there isn't enough surface space to accommodate the venting inserts, leading to air trapping problems in the product.

[0003] In view of the above, an ejection venting structure for molds is proposed to avoid the need for additional venting inserts and improve product quality. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a simple ejection and venting structure for molds, avoiding the need for additional venting inserts and improving product quality.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An ejection and venting structure for a mold includes: an ejector and a mold core; the ejector includes an ejector block and an ejector rod, one end of the ejector rod being connected to the ejector block; the mold core has a receiving cavity and a clearance hole, the ejector block being located in the receiving cavity, the ejector rod being located in the clearance hole, and a clearance gap being formed between the ejector rod and the clearance hole; the mold core also has a venting hole and a venting groove, one end of the venting hole communicating with the receiving cavity, and the venting groove connecting the clearance gap and the venting hole.

[0007] In one embodiment, the top block includes a pushing part and a mounting part, and the top rod is mounted on the mounting part.

[0008] In one embodiment, the ejector further includes a limiting pin, the ejector rod has a slot, the limiting pin passes through the mounting part, and the limiting pin is partially located in the slot.

[0009] In one embodiment, the limiting pin is a cylindrical limiting pin.

[0010] In one embodiment, the surrounding surface of the pusher portion is a guide slope.

[0011] In one embodiment, two top rods are provided, and one end of each top rod is connected to the top block.

[0012] In one embodiment, the exhaust port and the exhaust groove are provided in two locations, and the two exhaust ports and exhaust grooves are respectively connected to the clearance gap.

[0013] In one embodiment, the depth of the venting groove is 0.1mm-0.3mm.

[0014] In one embodiment, the depth of the venting groove is 0.2 mm.

[0015] In one embodiment, the vent is a cylindrical vent.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] This utility model discloses an ejector venting structure for molds. An ejector is installed in the mold core through a receiving cavity and a clearance hole, enabling the product to be ejected from the mold. Simultaneously, venting holes and venting grooves are provided in the mold core, connecting the receiving cavity and the clearance hole, allowing gas to escape through these passages, thus achieving venting. This avoids the need for additional venting inserts, simplifies the overall mold structure, and improves product yield. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0019] Figure 1 This is a schematic diagram of the ejection and venting structure for a mold in one embodiment of the present invention;

[0020] Figure 2 for Figure 1 A cross-sectional view of the ejection and venting structure used in the mold.

[0021] Figure 3 for Figure 2 A partially enlarged schematic diagram of the ejection and venting structure for the mold at point A;

[0022] Figure 4 for Figure 1 A schematic diagram of the separation structure between the ejector and the mold core in the ejection and venting structure of the mold. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0024] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an ejector venting structure 10 for a mold includes: an ejector 100 and a mold core 200. The ejector 100 includes an ejector block 110 and an ejector rod 120, one end of which is connected to the ejector block 110. The mold core 200 has a receiving cavity and a clearance hole. The ejector block 110 is located in the receiving cavity, and the ejector rod 120 is located in the clearance hole, with a clearance gap 300 formed between the ejector rod 120 and the clearance hole. The mold core 200 also has a venting hole 210 and a venting groove 220. One end of the venting hole 210 is connected to the receiving cavity, and the venting groove 220 is connected between the clearance gap 300 and the venting hole 210.

[0025] It should be noted that by creating a receiving cavity and a clearance hole on the mold core 200 for mounting the ejector 100, the mold can eject the product. Simultaneously, by creating vent holes 210 and vent grooves 220 on the mold core 200, which connect the receiving cavity and the clearance space 300, gas can be discharged through these openings, achieving the venting function. This avoids the need for additional venting inserts, simplifies the overall mold structure, improves product yield, reduces product creasing issues caused by venting inserts, and ultimately enhances the product's aesthetics. Specifically, the ejector venting structure 10 is installed on the mold base, for example, on the moving mold, while the mold core 200 is a component that forms the molding cavity. After the product cools and solidifies in the molding cavity, the ejector pin 120 pushes the ejector block 110 to eject the product, thereby achieving product demolding. Furthermore, the fitting gap between the ejector 100 and the mold core 200 forms a venting channel. During the injection molding stage, when the molten plastic enters the cavity, it compresses the internal air and the gases produced by the decomposition of the plastic at high temperatures. The gases are then released under pressure. Under the action of the ejector, the gas enters through the vent 210 through the tiny gap between the ejector block 110 and the accommodating cavity, then passes through the vent groove 220, and finally exits the mold through the clearance 300 between the ejector rod 120 and the clearance hole. The ejector rod 120 penetrates the mold frame, so the clearance 300 also connects to the outside, allowing gas to escape from the mold. For example, the tiny gap between the ejector block 110 and the accommodating cavity can be 0.02mm-0.05mm, preventing plastic from entering while allowing gas molecules to pass freely. Simultaneously, during the product ejection stage, the ejector rod 120 drives the ejector block 110 to eject the product. During ejection, residual gas continues to exit through the vent groove 220, preventing vacuum adsorption that could cause ejection difficulties, and also increasing heat dissipation through the vent 210.

[0026] In one embodiment, the top block 110 includes a pushing portion 111 and a mounting portion 112, with a push rod 120 mounted on the mounting portion 112. A step is formed between the pushing portion 111 and the mounting portion 112, meaning the size of the pushing portion 111 is larger than the size of the mounting portion 112. This facilitates adjustment of the gap between the mounting portion 112 and the bottom surface of the cavity. By moving the mounting portion 112 away from the cavity, the gap between the mounting portion 112 and the sidewall of the cavity can be increased, thus facilitating gas discharge. In this embodiment, the surrounding surface of the pushing portion 111 is a guide slope, which facilitates the repositioning of the top block 110 and reduces mold closing friction.

[0027] Furthermore, the ejector 100 also includes a limiting pin 130. A slot is provided on the ejector rod 120, and the limiting pin 130 passes through the mounting portion 112, with a portion of the limiting pin 130 located within the slot. By engaging the limiting pin 130 into the slot of the ejector rod 120, the connection between the ejector rod 120 and the ejector block 110 is ensured to be stable, preventing the ejector rod 120 from dislodging and ensuring accurate ejection. Preferably, the limiting pin 130 is a cylindrical limiting pin 130, which makes it easier to insert into the corresponding mounting hole in the mounting portion 112 of the ejector block 110.

[0028] In one embodiment, two push rods 120 are provided, with one end of each push rod 120 connected to the top block 110. The double push rod 120 structure can balance the pushing force. In this embodiment, two vent holes 210 and two vent grooves 220 are respectively provided, and the two vent holes 210 and vent grooves 220 are respectively connected to the clearance gap 300. That is, the double push rod 120 structure can be matched with a double vent structure, thereby further improving venting efficiency.

[0029] In one embodiment, the depth of the venting groove 220 is 0.1mm-0.3mm. This allows gas from the venting hole 210 to enter the clearance space 300 through the venting groove 220 and ultimately exit to the outside of the mold. Preferably, the depth of the venting groove 220 is 0.2mm.

[0030] Preferably, the exhaust port 210 is a cylindrical exhaust port 210. The cylindrical exhaust port 210 is easy to process, and at the same time, the airflow resistance is relatively smaller, which can improve the exhaust effect.

[0031] In one embodiment, the clearance 300 between the push rod 120 and the clearance hole is localized, that is, the clearance 300 is not provided in the area near the cavity, while the clearance 300 is locally provided in the area away from the cavity; that is, the diameter of the clearance hole is stepped, and the larger diameter position is the clearance 300 area, which makes it easier for gas to be discharged, while preventing gas from re-entering the cavity from the clearance hole.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An ejector venting structure for a mold, characterized in that, include: An ejector, the ejector comprising a top block and a top rod, one end of the top rod being connected to the top block; and The mold core has a receiving cavity and a clearance hole. The top block is located in the receiving cavity, the top rod is located in the clearance hole, and a clearance gap is formed between the top rod and the clearance hole. The mold core is also provided with an exhaust hole and an exhaust groove. One end of the exhaust hole is connected to the receiving cavity, and the exhaust groove is connected between the clearance space and the exhaust hole.

2. The ejection venting structure for a mold according to claim 1, characterized in that, The top block includes a pushing part and a mounting part, and the top rod is mounted on the mounting part.

3. The ejection venting structure for a mold according to claim 2, characterized in that, The ejector also includes a limiting pin, and the ejector rod has a slot. The limiting pin passes through the mounting part, and part of the limiting pin is located in the slot.

4. The ejection and venting structure for a mold according to claim 3, characterized in that, The limiting pin is a cylindrical limiting pin.

5. The ejection venting structure for a mold according to claim 2, characterized in that, The four sides of the pusher are guide slopes.

6. The ejection venting structure for a mold according to claim 1, characterized in that, There are two top rods, and one end of each top rod is connected to the top block.

7. The ejection venting structure for a mold according to claim 6, characterized in that, The exhaust port and the exhaust groove are provided in two locations, and the two exhaust ports and the two exhaust grooves are respectively connected to the clearance gap.

8. The ejector venting structure for a mold according to claim 1, characterized in that, The depth of the exhaust groove is 0.1mm-0.3mm.

9. The ejector venting structure for a mold according to claim 8, characterized in that, The depth of the exhaust groove is 0.2 mm.

10. The ejection venting structure for a mold according to any one of claims 1-9, characterized in that, The exhaust port is a cylindrical exhaust port.

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