Material rod wire drawing prevention mechanism for injection mold

Abstract

The utility model discloses a material rod wire drawing prevention mechanism for an injection mold, and belongs to the field of structural design of injection molds. The injection mold comprises a movable mold and a fixed mold, a movable mold core and a fixed mold core are fixed to the movable mold and the fixed mold respectively, an injection molding cavity is formed between the movable mold core and the fixed mold core, a pouring cup is further arranged on the movable mold, and a material injection hole is formed in the pouring cup; a blowing mechanism is arranged on the fixed mold, a blowing insert is fixed to the position, close to the sprue cup, of the fixed mold core, a blowing hole connected with the blowing mechanism is formed in the blowing insert, an included angle is formed between the air outlet direction of the blowing hole and the axial direction of the injection hole, and the caliber of the blowing hole is gradually reduced in the airflow direction. The utility model has the following advantages and effects: air can be blown into the material injection hole of the sprue cup, so that the wire drawing part at the tail end of the material rod is quickly cooled and broken, the influence on the surface cleanliness of an injection mold and the product quality caused by the wire drawing of the material rod is avoided, and the use effect is very good.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, and more particularly to an anti-material rod wire drawing mechanism for injection molds. Background Art

[0002] An injection mold is a tool used to manufacture plastic products. Molten plastic is injected into the mold through injection molding, and the desired product is obtained after it cools and solidifies. An injection mold typically consists of a movable mold and a fixed mold. An injection cavity is located between the movable and fixed molds, matching the shape of the product being molded. A sprue cup is fixed to the movable mold, and a sprue hole is located within the sprue cup. During injection, the material enters the injection cavity through the sprue cup's sprue hole. After injection molding, when the movable and fixed molds are separated (i.e., mold opening), a section of the material stem formed within the sprue hole exits with the product. However, because the material is in a high-temperature molten state, stringing occurs at the end of the stem as it exits the sprue hole. This is particularly problematic when using highly viscous materials such as nylon. This not only affects mold cleanliness but can also lead to reduced quality in the finished product. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a material rod wire drawing prevention mechanism for injection molds, which can promptly cut off the wire drawing generated at the end of the material rod when the injection mold is opened, so as to prevent the wire drawing from affecting the cleanliness of the mold and the quality of the product.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] The utility model provides an anti-material rod wire drawing mechanism for an injection mold, comprising a movable mold and a fixed mold, wherein a movable mold core and a fixed mold core are fixed on the movable mold and the fixed mold core respectively, an injection cavity is formed between the movable mold core and the fixed mold core, and a pouring cup is further provided on the movable mold, wherein the pouring cup has an injection hole; an air blowing mechanism is provided on the fixed mold, and a air blowing insert is fixed on the fixed mold core near the pouring cup, and an air blowing hole connected to the air blowing mechanism is provided on the air blowing insert, the air outlet direction of the air blowing hole forms an angle with the axial direction of the injection hole, and the diameter of the air blowing hole gradually decreases along the air flow direction.

[0006] In some embodiments, the blowing mechanism includes a solenoid valve, an air pipe and a first air duct, the solenoid valve is fixed on the fixed mold, the first air duct is formed in the fixed mold, the external port of the first air duct is arranged on the outer wall of the fixed mold and is equipped with an air pipe joint, the air pipe joint is connected to the solenoid valve through the air pipe, and the first air duct is connected to the blowing hole.

[0007] In some embodiments, a second air duct connected to the first air duct is further provided in the fixed mold, and the external port of the second air duct is provided on the outer wall of the fixed mold, and the external port of the first air duct and the external port of the second air duct are provided on the outer walls of the fixed mold in different directions, and the external port of the second air duct is provided with a plug.

[0008] In some embodiments, the angle formed between the outlet direction of the blowing hole and the axial direction of the injection hole is 5-20 degrees.

[0009] In some embodiments, the first air channel and the second air channel are arranged vertically.

[0010] By adopting the above technical solution, the utility model has the following effects:

[0011] The utility model optimizes the design of the injection mold structure. When the utility model is installed and used, during the mold opening process, when the movable mold and the fixed mold are opened and separated by a distance (such as 25-30MM), the blowing mechanism is controlled to open the air path, and high-pressure gas is ejected through the blowing holes on the blowing insert to blow air into the injection hole of the pouring cup, so that the gas enters the injection hole along the gap between the material rod and the injection hole and quickly reduces the temperature of the tail end of the injection rod, so that the wire drawing at the tail end of the material rod can be broken in the injection hole in time when the mold is opened, so as to prevent long wire drawing at the tail end of the material rod from adhering to the mold surface when the mold is opened, thereby effectively avoiding the influence of wire drawing on the cleanliness of the mold and the adverse effect on product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 A three-dimensional diagram of the injection mold in the present invention;

[0014] Figure 2 This is a three-dimensional diagram of the fixed mold in the utility model;

[0015] Figure 3 for Figure 2 The structural diagram of the fixed mold shown;

[0016] Figure 4 This is a side view of the movable mold and the fixed mold of the utility model in the mold closing state;

[0017] Figure 5 This is a side view of the movable mold and the fixed mold in the utility model with a distance between them;

[0018] Figure 6 This is a schematic diagram of the structure of the air-blowing insert in the utility model.

[0019] The reference numerals shown in the figure are: 10, movable mold; 1, fixed mold; 12, fixed mold core; 2, pouring cup; 20, injection hole; 21, blowing insert; 3, solenoid valve; 31, air pipe; 32, air pipe joint; 33, first air channel; 34, second air channel; 35, plug; 4, blowing hole; 5, material rod. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0023] The anti-material rod wire drawing mechanism for injection molds provided in the embodiment of the present utility model has a structure as follows Figures 1 to 6As shown, it includes a movable mold 10 and a fixed mold 1. A movable mold core and a fixed mold core 12 are fixed on the movable mold 10 and the fixed mold 1 respectively. An injection cavity is formed between the movable mold core and the fixed mold core 12. A pouring cup 2 is provided on the movable mold 10. The pouring cup 2 has an injection hole 20. When the mold is closed for injection, the injection material melts at high temperature in the injection molding barrel and then enters the injection hole 20 under high pressure and is filled into the injection cavity. A blowing mechanism is provided on the fixed mold 1. A blowing insert 21 is fixed on the side surface of the fixed mold core 12 facing the movable mold core at a position close to the pouring cup 2. The blowing insert 21 is embedded and fixed on the fixed mold core 12. A blowing hole 4 connected to the blowing mechanism is provided on the blowing insert 21. The air outlet direction of the blowing hole 4 forms an angle A with the axial direction of the injection hole 20 (see Figure 4 ), the angle is preferably set to 5 degrees to 20 degrees, and the diameter of the blowing hole 4 along the air flow direction gradually decreases ( Figure 6 As shown), such a setting is conducive to the high-speed and accurate spraying of gas into the injection hole 20, thereby facilitating the rapid and effective disconnection of the wire drawing portion, and can prevent impurities from entering the interior of the blowing hole 4 through the outlet port of the blowing hole 4.

[0024] See attached Figure 4 and Figure 5 When the injection mold is installed on the injection molding machine, during the mold opening process, when the movable mold 10 and the fixed mold 1 are separated by a distance (e.g., 25-30 mm), the blowing mechanism is controlled to open, and high-pressure gas is ejected through the outlet of the blowing hole 4 on the blowing insert 21, blowing into the injection hole 20 of the pouring cup 2, so that the gas enters the injection hole 20 along the gap between the material rod 5 and the injection hole 20, quickly reducing the temperature of the tail end of the injection rod 5, so that the wire at the tail end of the material rod 5 can be broken in the injection hole 20 in time when the mold is opened, thereby preventing long wires from adhering to the mold surface at the tail end of the material rod 5 when the mold is opened, thereby effectively avoiding the wires affecting the mold cleanliness and the adverse effects on product quality caused by the wires. The high-pressure gas can be compressed air or cold air.

[0025] Reference Attachment Figure 3 As shown, the blowing mechanism includes a solenoid valve 3, an air pipe 31 and a first air channel 33. The solenoid valve 3 is fixed to the outside of the fixed mold 1. The first air channel 33 is formed in the fixed mold 1. The outer port of the first air channel 33 is arranged on the outer wall of the fixed mold 1 and is equipped with an air pipe joint 32. The air pipe joint 32 is connected to the solenoid valve 3 through the air pipe 31. The first air channel 33 is connected to the blowing hole. The side of the solenoid valve 3 facing away from the air pipe 31 is connected to an air supply source (such as an air pump) to provide gas. The solenoid valve 3 is used to control the on-off of the air circuit. When the solenoid valve 3 is opened, the gas passes through the air pipe 31, the first air channel 33 and the blowing hole 4 to blow air into the injection hole 20.

[0026] like Figure 3As shown, in some embodiments, a second air duct 34 connected to the first air duct 33 is further provided in the fixed mold 1. For the convenience of processing, it is preferred to set the first air duct 33 and the second air duct 34 to be vertically arranged. During processing, the first air duct 33 and the second air duct 34 are processed on the fixed mold 1 by drilling. The outer port of the second air duct 34 is arranged on the outer wall of the fixed mold 1, and the outer port of the first air duct 33 and the outer port of the second air duct 34 are arranged on the outer wall of the fixed mold 1 in different directions. The outer port of the second air duct 34 is provided with a plug 35. In this way, during actual installation, the plug 35 and the air pipe joint 32 can be flexibly installed on the outer port of the first air duct 33 and the outer port of the second air duct 34 according to actual conditions, thereby improving the flexibility of use. The plug 35 and the air pipe joint 32 are both detachable.

[0027] The specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A material rod wire drawing prevention mechanism for an injection mold, comprising a movable mold (10) and a fixed mold (1), wherein a movable mold core and a fixed mold core (12) are fixed to the movable mold (10) and the fixed mold (1), respectively, an injection cavity is formed between the movable mold core and the fixed mold core (12), and a pouring cup (2) is further provided on the movable mold (10), wherein the pouring cup (2) has a material injection hole (20); characterized in that, The fixed mold (1) is provided with a blowing mechanism, and a blowing insert (21) is fixed on the fixed mold core (12) at a position close to the pouring cup (2). The blowing insert (21) is provided with a blowing hole (4) connected to the blowing mechanism, and the air outlet direction of the blowing hole (4) forms an angle with the axial direction of the injection hole (20), and the diameter of the blowing hole (4) gradually decreases along the air flow direction.

2. The anti-material rod wire drawing mechanism for an injection mold according to claim 1, characterized in that: The blowing mechanism comprises a solenoid valve (3), an air pipe (31) and a first air channel (33), wherein the solenoid valve (3) is fixed to the outside of the fixed mold (1), the first air channel (33) is formed in the fixed mold (1), an outer end of the first air channel (33) is arranged on the outer wall of the fixed mold (1) and is provided with an air pipe joint (32), the air pipe joint (32) is connected to the solenoid valve (3) through the air pipe (31), and the first air channel (33) is communicated with the blowing hole.

3. The anti-material rod wire drawing mechanism for an injection mold according to claim 2, characterized in that: A second air channel (34) communicating with the first air channel (33) is further provided in the fixed mold (1), and an outer port of the second air channel (34) is provided on an outer side wall of the fixed mold (1). The outer port of the first air channel (33) and the outer port of the second air channel (34) are provided on the outer side walls of the fixed mold (1) in different directions, and a plug (35) is provided on the outer port of the second air channel (34).

4. The anti-material rod wire drawing mechanism for an injection mold according to claim 1, characterized in that: The angle formed between the air outlet direction of the blowing hole (4) and the axial direction of the injection hole (20) is 5-20 degrees.

5. The anti-material rod wire drawing mechanism for an injection mold according to claim 3, characterized in that: The first air channel (33) and the second air channel (34) are arranged vertically.

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