Active exhaust device of injection mold

Abstract

The utility model relates to an active exhaust device of an injection mold, which comprises a mold core exhaust needle, a mold core exhaust via hole and a mold core exhaust joint, the mold core exhaust needle is connected with the mold core exhaust joint through the mold core exhaust via hole, and the mold core exhaust joint is directly connected into a negative pressure air exhaust system of an injection molding machine through a pipeline to form a continuous active exhaust channel. According to the exhaust device for the injection mold, through an external active exhaust mode, gas in the mold is exhausted outwards and exhausted actively during injection molding, and after the exhaust connector on the mold is connected with an injection molding machine, the exhaust connector is always in an exhaust state and exhausts the gas in the mold outwards, so that the exhaust function is achieved. In the production process, the exhaust state is kept all the time, pressure brought by gas in production can be effectively relieved, exhaust of the injection mold is completed, and therefore normal production of the mold can be achieved.

Description

Technical Field

[0001] This utility model relates to an injection mold venting device, which is used to vent gases trapped in the mold due to the complex structure of the product. It is used for products with severe gas trapping in the mold and belongs to the field of injection mold technology. Background Technology

[0002] Currently, some injection-molded plastic products, due to structural limitations, have difficulty venting gas from the mold. During the injection process, the inability to expel gas results in high pressure, leading to product defects and preventing the production of complete products. Furthermore, the inability to vent gas causes dimensional instability, making the products unsuitable for assembly and unacceptable to customers, resulting in significant losses for the company. In the field of injection molding technology, venting gas is a major headache, and many have struggled to solve this problem effectively. Therefore, venting is a crucial aspect of injection molding technology; at best, it increases the scrap rate, and at worst, it leads to mold failure. Figure 1 The diagram illustrates a traditional mold core venting method for injection molds, demonstrating how venting is achieved. This method, a relatively traditional and conventional approach, addresses the issue that the large amount of gas generated during injection molding is crucial. If this gas cannot be effectively expelled from the mold, it's impossible to produce a high-quality product, resulting in a significant waste of company resources – a potentially fatal outcome for any company. Traditional venting involves creating one or more venting channels around the product. During injection, the plastic is compressed within the mold, passively expelling the gas through these channels. While this method works for simple products, increasingly demanding requirements for both appearance and functionality have led to more complex product structures. Using conventional venting methods is insufficient, compromising production stability, dimensional accuracy, and ultimately increasing scrap rates, production costs, and time. This can even delay delivery dates, potentially causing customer order cancellations and rendering the molds unusable. Therefore, a better venting structure and method are needed to mitigate these potential problems. We tried various methods to solve this problem, many of which ultimately failed. Some methods, while barely usable, were not very effective. Through continuous effort and a spirit of perseverance, we fought on despite repeated setbacks, and finally, through our unremitting efforts, we solved this global problem. Summary of the Invention

[0003] The purpose of this invention is to provide an active venting device for injection molds, which employs a stable and effective venting method to effectively solve the venting problem during injection molding production, thereby reducing product scrap rate.

[0004] To achieve the above objectives, the technical solution of this utility model is: an active venting device for injection molds, comprising a core venting pin, a core venting through hole, and a core venting connector. The core venting pin is connected to the core venting connector through the core venting through hole. The core venting connector is directly connected to the negative pressure suction system of the injection molding machine through a pipeline to form a continuous active venting channel.

[0005] Furthermore, the core venting pin penetrates the mold core and extends to the surface of the mold cavity.

[0006] Furthermore, the core venting connector is fixed to the outer wall of the mold and connected to the end of the core venting through hole.

[0007] Furthermore, a core venting sealing ring is provided between the core venting pin and the mounting hole of the mold core.

[0008] Furthermore, the core venting through hole has a two-section hole structure, with one section connecting to the core venting pin and the other section connecting to the core venting connector.

[0009] The beneficial effects of this utility model are:

[0010] This utility model discloses an active venting device for injection molds. By employing an external active venting method, the venting connector on the mold is connected to the injection molding machine, ensuring it remains in a continuous venting state, drawing gas out of the mold and thus achieving the venting function. By simultaneously venting gas from the mold during injection molding and maintaining a continuous venting state throughout the production process, the device effectively reduces the pressure caused by gas during production, completing the venting of the injection mold and enabling normal production.

[0011] The advantages of this invention are active exhaust, simple installation, and convenient disassembly. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a traditional injection mold venting device.

[0013] Figure 2 This is a schematic diagram of the active venting device for injection molds according to this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and examples:

[0015] like Figure 2 As shown in the figure, an active venting device for injection molds provided in this embodiment of the present invention includes a core venting pin 1, a core venting sealing ring 2, a core venting through hole 3, and a core venting connector 4.

[0016] The core venting pin 1 connects to the core venting connector 4 through the core venting through-hole 3. The core venting connector 4 is directly connected to the negative pressure suction system of the injection molding machine through a pipeline, forming a continuous active venting channel. Wherein:

[0017] The core venting pin 1 penetrates the mold core and extends to the surface of the mold cavity.

[0018] The core venting connector 4 is fixed to the outer wall of the mold and connected to the end of the core venting through hole 3.

[0019] A core venting sealing ring 2 is provided between the core venting pin 1 and the mounting hole of the mold core. The core venting sealing ring 2 is pressed into the core venting pin 1 and the mounting hole to ensure that the pre-compression of the sealing ring reaches the design value.

[0020] The core venting through hole 3 has a two-section hole structure, with one section connecting to the core venting pin 1 and the other section connecting to the core venting connector 4.

[0021] This utility model discloses an active venting device for injection molds. Through an external connection, the venting connector on the mold is connected to the injection molding machine, and it remains in a continuous venting state, drawing gas out of the mold to achieve the venting function. By actively venting gas from the mold during injection molding, it effectively reduces the pressure caused by gas during production, completing the venting process and allowing the mold to operate normally.

[0022] This invention relates to an active venting device for injection molds. Through external active venting, it extracts gas from the mold during injection molding. This contrasts with traditional venting methods, which rely on extrusion during injection to force gas through venting channels. Traditional methods require high pressure on the injection molding machine, leading to burrs on the product. While small burrs can be removed manually, larger burrs are difficult to remove by hand, increasing both labor costs and overall efficiency. This active venting device actively vents gas throughout the production process, effectively reducing pressure and ensuring the mold can continue operating normally.

[0023] This utility model's active venting device for injection molds, when applied to molds, immediately solves the problem of trapped gas in injection molds. Its use has resolved all current issues of product defects caused by inadequate venting. This is an injection mold venting device that ensures no material shortage and stable product dimensions.

Claims

1. An injection mold active venting apparatus, characterized by: It includes a core venting pin, a core venting through hole, and a core venting connector. The core venting pin is connected to the core venting connector through the core venting through hole. The core venting connector is directly connected to the negative pressure suction system of the injection molding machine through a pipeline to form a continuous active venting channel.

2. The injection mold active venting apparatus of claim 1, wherein: The venting pins penetrate the mold core and extend to the surface of the mold cavity.

3. The injection mold active venting apparatus of claim 1, wherein: The core venting connector is fixed to the outer wall of the mold and connected to the end of the core venting through hole.

4. The injection mold active venting apparatus of claim 1, wherein: A core venting sealing ring is provided between the core venting pin and the mounting hole of the mold core.

5. The injection mold active venting apparatus of claim 1, wherein: The core venting through hole has a two-section structure, with one section connecting to the core venting pin and the other section connecting to the core venting connector.

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