Exhaust type injection molding machine charging barrel

Abstract

The utility model relates to an exhaust type charging barrel of an injection molding machine, which belongs to the field of structural design of injection molding machines, and can effectively ensure that gas in the charging barrel is exhausted in time by improving the structure of the charging barrel so as to achieve the aims of exhausting and dehumidifying. The exhaust type injection molding machine charging barrel comprises a charging barrel and a screw rod arranged in the charging barrel, small exhaust holes are formed in the wall of the charging barrel, an inner cavity of the charging barrel is communicated with the outside through the small exhaust holes, the small exhaust holes are formed downwards from inside to outside, and the diameter of the inner end of each small exhaust hole is not larger than 1 mm.

Description

Technical Field

[0001] The utility model relates to a barrel of an injection molding machine, belonging to the field of injection molding machine structure design. Background Art

[0002] When an injection molding machine is working, plastic materials are added into the barrel. Through the rotation of the screw in the barrel and the heating of the barrel, the plastic materials become molten state. Then, through the rotation of the screw, the plastic materials are driven forward, so that the plastic is ejected from the nozzle at the end of the barrel with great pressure and speed and injected into the closed mold. After pressure holding and cooling, it is solidified into the required plastic products. During the working process, the plastic materials in the barrel undergo melting, compression and decompression processes. The water and volatile substances in the molten plastic materials will vaporize. If the vaporized water vapor and volatile substances cannot be discharged, the quality of the injection molded products will be affected. Summary of the Utility Model

[0003] The utility model provides an exhaust type injection molding machine barrel. Through the improvement of the barrel structure, the exhaust can be effectively ensured, the overflow of materials can be reduced, and the injection molding quality can be guaranteed.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] The utility model provides an exhaust type injection molding machine barrel, which comprises a barrel and a screw arranged in the barrel; exhaust small holes are arranged on the barrel wall of the barrel, the exhaust small holes communicate the inner cavity of the barrel with the outside, the exhaust small holes are arranged downward from inside to outside, and the inner port diameter of the exhaust small holes is not greater than 1 mm.

[0006] In some embodiments, a groove recessed inward is formed on the outer wall of the barrel, and the outer port of the exhaust small hole is arranged on the bottom surface of the groove.

[0007] In some embodiments, the outer port of the exhaust small hole is of a conical structure with a large outer part and a small inner part.

[0008] In some embodiments, at least one row of exhaust small holes is arranged on the barrel wall of the barrel in a circumferential distribution along the barrel, and each row of exhaust small holes comprises a plurality of exhaust small holes arranged at intervals along the axial direction of the barrel.

[0009] In some embodiments, the screw has a compression section, and the exhaust small holes are arranged deviating from the position opposite to the compression section.

[0010] In some embodiments, the inner port diameter of the exhaust small holes is 0.4 mm to 0.8 mm.

[0011] The barrel of the exhaust type injection molding machine provided by the present utility model is provided with exhaust small holes on the barrel wall, and water vapor in the barrel is discharged through the exhaust small holes. Since materials will enter the exhaust small holes during exhaust, in order to prevent the materials from easily clogging after entering the exhaust small holes, the exhaust small holes are arranged downward, so that it is more conducive for the materials entering the exhaust small holes to be discharged from their outer ports, and the clogging of the exhaust small holes by materials is avoided as much as possible. In order to prevent the problem of excessive overflow of materials due to the too large inner port diameter of the exhaust small holes causing the materials to enter the exhaust small holes more easily, the inner port diameter of the exhaust small holes is controlled not to be greater than 1 mm, so as to reduce the overflow amount during exhaust. This improvement point can effectively ensure the timely discharge of gas in the barrel to achieve the purpose of exhaust dehumidification, and further ensure the injection molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0013] Figure 1 is a schematic structural diagram of the barrel of the exhaust type injection molding machine in the present utility model;

[0014] Figure 2 is a schematic structural diagram when the screw and the barrel are separated in the present utility model;

[0015] Figure 3 is Figure 1 a schematic structural diagram of another perspective of the barrel of the exhaust type injection molding machine in;

[0016] Figure 4 is for smoke Figure 3 a sectional view taken along the A-A line in (rotated 90 degrees counterclockwise);

[0017] Figure 5 is Figure 4 a partial enlarged view at B in.

[0018] The reference numerals shown in the figures: 1 - barrel; 2 - screw; 21 - compression section; 3 - exhaust small hole;

[0019] 4 - groove; 41 - groove bottom surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0023] As Figures 1 to 5 shown, the present utility model provides an exhaust type injection molding machine barrel, which includes a barrel 1 and a screw 2 disposed inside the barrel 1; exhaust small holes 3 are provided on the barrel wall of the barrel 1, and the exhaust small holes 3 communicate the inner cavity of the barrel 1 with the outside. The exhaust small holes 3 are arranged downward from the inside to the outside, and the inner diameter of the inner port of the exhaust small holes 3 is not greater than 1 mm. Specifically, the inner diameter of the inner port of the exhaust small holes 3 can be set to 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, or 1 mm. The above "downward" includes inclined downward and vertically downward. Specifically, when the barrel 1 is installed and used, the outer port of the exhaust small hole 3 is set lower than the inner port of the exhaust small hole 3.

[0024] In this embodiment, exhaust small holes 3 are provided on the barrel wall of the barrel 1, and water vapor in the barrel 1 is discharged through the exhaust small holes 3. Since materials will enter the exhaust small holes 3 during exhaust, in order to prevent the problem that the materials are prone to blockage after entering the exhaust small holes 3, the exhaust small holes 3 are arranged downward, so that it is more conducive to the materials entering the exhaust small holes 3 to be discharged from their outer ports, and as much as possible to avoid the blockage of the exhaust small holes 3 by materials. In order to prevent the problem that when the inner port diameter of the exhaust small holes 3 is too large, the materials are more likely to enter the exhaust small holes 3, resulting in too much overflow of materials, the inner port diameter of the exhaust small holes 3 is controlled not to be greater than 1 mm, so as to reduce the overflow amount during exhaust and ensure the injection molding quality.

[0025] Preferably, as Figure 1 , Figure 4 and Figure 5 shown, a recess 4 is provided on the outer wall of the barrel 1 and recesses inward. The recess 4 can be processed by milling. The outer port of the exhaust small hole 3 is arranged on the groove bottom surface 41 of the recess 4. By providing the recess 4, the thickness of the corresponding position of the barrel wall is reduced, so as to reduce the axial length of the exhaust small hole 3 at the corresponding position, which can reduce the exhaust resistance, make the exhaust smoother, and is convenient for cleaning when overflowing glue occurs.

[0026] Preferably, the outer port of the exhaust small hole 3 is set as a conical structure with a large outer and a small inner, so that it is beneficial for gas and materials to be discharged from the exhaust small hole 3.

[0027] Refer to Figure 1 shown. In order to further improve the exhaust effect and increase the exhaust volume, at least one row of exhaust small holes 3 is arranged on the barrel wall of the barrel 1 along the circumferential direction of the barrel 1. Each row of exhaust small holes 3 includes a plurality of exhaust small holes 3 arranged at intervals along the axial direction of the barrel 1.

[0028] The screw 2 has a compression section 21. There is at least one section of the compression section 21 on the screw 2. When the screw 2 moves, a great pressure will be generated on the materials in its compression section 21. If the exhaust small holes 3 are correspondingly arranged at the compression section 21, under the strong pressure of the compression section 21, the materials are more likely to overflow from the exhaust small holes 3, resulting in a more serious overflow phenomenon. Therefore, the exhaust small holes 3 are arranged at a position deviated from the position opposite to the compression section 21 to reduce the overflow problem.

[0029] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A venting type injection molding machine barrel, comprising a barrel (1) and a screw (2) disposed in the barrel (1); characterized in that: An exhaust hole (3) is provided on the wall of the barrel (1), and the exhaust hole (3) connects the inner cavity of the barrel (1) with the outside. The exhaust hole (3) is arranged downward from the inside to the outside, and the inner diameter of the exhaust hole (3) is not greater than 1 mm.

2. The exhaust type injection molding machine barrel according to claim 1, characterized in that: An inwardly recessed groove (4) is provided on the outer wall of the barrel (1), and the outer end of the exhaust hole (3) is arranged on the groove bottom surface (41) of the groove (4).

3. The exhaust type injection molding machine barrel according to claim 1, characterized in that: The outer end of the exhaust hole (3) is a conical structure that is larger on the outside and smaller on the inside.

4. The exhaust type injection molding machine barrel according to claim 1, characterized in that: At least one row of exhaust holes (3) is arranged on the barrel wall of the barrel (1) in a circumferential direction of the barrel (1), and each row of exhaust holes (3) comprises a plurality of exhaust holes (3) arranged at intervals along the axial direction of the barrel (1).

5. The exhaust type injection molding machine barrel according to claim 1, characterized in that: The screw (2) has a compression section (21), and the exhaust hole (3) is arranged at a position deviated from and opposite to the compression section (21).

6. The exhaust type injection molding machine barrel according to claim 1, characterized in that: The inner diameter of the exhaust hole (3) is 0.4 mm to 0.8 mm.

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