A method for manufacturing a special-shaped injection molded pipe fitting and a special-shaped injection molded pipe fitting structure

Abstract

The present invention relates to the field of injection molding technology, and discloses a method for manufacturing a special-shaped injection-molded pipe fitting and a special-shaped injection-molded pipe fitting structure. The method for manufacturing a special-shaped injection-molded pipe fitting comprises the following steps: 1. Injection-molding a pipe fitting liner in two halves, wherein a raised portion is provided on the outer wall of the pipe fitting liner; 2. The two halves of the pipe fitting liner are aligned to form a synthetic liner as a whole; 3. The pipe fitting liner is placed in a mold, wherein the raised portion abuts against the inner wall of the mold, and a secondary rubber coating is performed on the outer side of the pipe fitting liner to obtain a finished pipe fitting. The special-shaped injection-molded pipe fitting structure comprises a pipe fitting liner and a rubber coating layer, wherein the pipe fitting liner is composed of two halves corresponding to the synthetic whole, wherein a raised portion is provided on the outer wall of the pipe fitting liner, and the rubber coating layer wraps the outer wall of the pipe fitting liner. The mold used in the production process of this manufacturing method is very easy to manufacture, which can effectively reduce the cost of the mold, is very easy to produce, and has a very high production efficiency, and the quality of the special-shaped pipe fittings is also better.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, in particular to a method for manufacturing a special-shaped injection-molded pipe fitting and a special-shaped injection-molded pipe fitting structure. Background Art

[0002] At present, in the injection molding production of pipe fittings such as hoses and plastic pipes, the injection molding method is generally more commonly used for pipe fittings of conventional shapes. It is more difficult to perform injection molding on special-shaped pipe fittings. The production of injection molds is quite difficult, which is not conducive to processing and production. The cost is high and the efficiency is low, and the quality of the finished product is difficult to control. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for manufacturing a special-shaped injection-molded pipe fitting which is easy to produce, low in cost, high in efficiency and has good injection molding quality.

[0004] In order to solve the above technical problems, the present invention provides a method for manufacturing a special-shaped injection-molded pipe fitting.

[0005] A method for manufacturing a special-shaped injection-molded pipe fitting comprises the following steps:

[0006] 1. The inner tube of the pipe is injection molded in two halves, and a raised portion is provided on the outer wall of the inner tube of the pipe;

[0007] 2. Combining the two halves of the tube liner into a whole liner;

[0008] 3. The inner shell of the pipe fitting is placed in a mold, the raised portion is in contact with the inner wall of the mold, and the outer shell of the pipe fitting is injected with a secondary rubber coating to obtain a finished pipe fitting.

[0009] As a preferred solution of the present invention, the two halves of the tube liner are respectively provided with mutually matching recessed portions and plug-in portions at the joint.

[0010] As a preferred solution of the present invention, the recessed portion is a stepped recess extending along the inner liner of the tube, and the plug-in portion is a stepped protrusion extending along the inner liner of the tube.

[0011] As a preferred solution of the present invention, the protrusion is in the shape of an oblate cylinder, and a plurality of the protrusions are distributed axially on the outer wall of the inner liner of the tube.

[0012] As a preferred embodiment of the present invention, the raised portion is distributed at the top ends of the two halves of the outer wall of the tube liner, the central axis of the raised portion is perpendicular to the mating surface of the tube liner, and the raised portions are symmetrical along the mating surface of the tube liner.

[0013] A special-shaped injection-molded pipe structure includes a pipe liner and a rubber coating. The pipe liner is composed of two corresponding synthetic halves. A protrusion is provided on the outer wall of the pipe liner, and the rubber coating wraps the outer wall of the pipe liner.

[0014] As a preferred solution of the present invention, the two halves of the tube liner are respectively provided with mutually matching recessed portions and plug-in portions at the joint.

[0015] As a preferred solution of the present invention, the recessed portion is a stepped recess extending along the inner liner of the tube, and the plug-in portion is a stepped protrusion extending along the inner liner of the tube.

[0016] As a preferred solution of the present invention, the protrusion is in the shape of an oblate cylinder, and a plurality of the protrusions are distributed axially on the outer wall of the inner liner of the tube.

[0017] As a preferred embodiment of the present invention, the raised portion is distributed at the top ends of the two halves of the outer wall of the tube liner, the central axis of the raised portion is perpendicular to the mating surface of the tube liner, and the raised portions are symmetrical along the mating surface of the tube liner.

[0018] Compared with the prior art, the method for manufacturing a special-shaped injection molded pipe fitting and the special-shaped injection molded pipe fitting structure of the embodiment of the present invention have the following beneficial effects: the mold used in the production process of this manufacturing method is very easy to manufacture, which can effectively reduce the cost of the mold, is very easy to produce, and has a very high production efficiency, and the quality of the special-shaped pipe fitting is also better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 2 is a schematic diagram of the two halves of the inner liner of a pipe fitting according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Structural diagram from another perspective;

[0021] Figure 3 This is a schematic structural diagram of a finished pipe fitting according to an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the cross-sectional structure of a finished pipe fitting in an embodiment of the present invention.

[0023] In the figure, 1, inner liner of the pipe; 11, raised part; 12, recessed part; 13, plug-in part; 2, rubber coating. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0025] In the description of the present invention, it should be understood that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" used in the present invention should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] In the description of the present invention, it should also be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the machine or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0027] refer to Figure 1 -3. A method for manufacturing a special-shaped injection-molded pipe fitting according to a preferred embodiment of the present invention comprises the following steps:

[0028] 1. The tubular liner 1 is injection molded in two halves. A raised portion 11 is provided on the outer wall of the tubular liner 1. The raised portion 11 can be cylindrical, hemispherical, conical, rectangular, or strip-shaped. The raised portion 11 can extend radially or circumferentially on the outer wall of the tubular liner 1. The structure of the tubular liner 1 being divided into two halves allows injection molding to be achieved using only a simple mold, without the need for a special-shaped strip corresponding to the inner hole of the tubular liner 1 to form a tube hole during injection molding.

[0029] 2. The two halves of the pipe liner 1 are combined into a whole liner and fixed into a pipe prototype;

[0030] 3. The pipe liner 1 is placed in the mold, and the raised portion 11 is in contact with the inner wall of the mold, so that the pipe liner 1 can be fixed in the mold only by the inner wall. The pipe liner 1 is injected with secondary rubber coating to form a rubber coating layer 2 to obtain a finished pipe. The rubber coating layer 2 further wraps the two halves of the pipe liner 1 from the outside, and the pipe liner 1 also serves as the injection mold core of the rubber coating layer 2. The raised portion 11 is naturally surrounded by the rubber coating layer 2 and is flush with it. The structure is quite firm. The mold used in the entire injection molding production process of the special-shaped pipe fitting is very easy to manufacture, which can effectively reduce the cost of the mold, and the production efficiency is quite high, and the quality of the special-shaped pipe fitting is also better.

[0031] refer to Figure 2 and 4 For example, the two halves of the tube liner 1 are respectively provided with mutually matching recessed portions 12 and plug-in portions 13 at the mating position, and the two halves of the tube liner 1 are respectively inserted into the recessed portions 12 through the plug-in portions 13 on the mating edges, thereby playing a role in limiting and fixing when mating. The recessed portion 12 can be a concave hole, a groove, a concave position, etc., and the plug-in portion 13 can also be a corresponding convex pin, a convex strip, a protrusion, etc., and the recessed portion 12 and the plug-in portion 13 can extend accordingly along the extension of the tube liner 1 or be distributed in multiples.

[0032] refer to Figure 2 and 4 , exemplarily, the recessed portion 12 is a stepped recess extending along the tube liner 1, and the plug-in portion 13 is a stepped protrusion extending along the tube liner 1, so the recessed portion 12 and the plug-in portion 13 are correspondingly close to the mating edges on the inner side or outer side of the tube liner 1, and the two are simply joined and easy to position the tube liner 1. The recessed portion 12 and the plug-in portion 13 extend along the tube liner 1, which can make the mating have better structural force. In addition, it is also easier to design the injection mold, especially for special-shaped tubes, which are already small, and the subtle structure is more difficult to design on the mold. For example, if the recessed portion 12 is a groove, the mold needs to be more refined at the structure corresponding to the groove, which is not convenient for better cost reduction.

[0033] refer to Figure 1 and 3, for example, the raised portion 11 is an oblate cylinder, and the outer wall of the tube liner 1 is provided with several raised portions 11 along the axial direction. Generally, the two halves of the tube liner 1 are respectively in contact with the wall surface of the mold through the raised portions 11 on the outer wall, so that the tube liner 1 is fixed in the mold and space is left for injection molding and overmolding. The positioning of the tube liner 1 can be supported in the mold by the reverse force exerted by the inner wall of the mold on the raised portions 11. Therefore, the raised portions 11 can be dispersed around the outer wall of the tube liner 1 in the radial direction. For example, two raised portions 11 are distributed at a certain radial position on the outer wall of half of the tube liner 1, and at least one raised portion 11 is distributed at the radial position on the outer wall of the other half of the tube liner 1, thereby forming a limit position that is automatically aligned in at least three directions, and the angles between the raised portions 11 can be arbitrarily spaced, which is very convenient during injection molding and overmolding.

[0034] refer to Figure 1 and 3 , exemplarily, the raised portions 11 are distributed at the top ends of the two halves of the outer walls of the tube liner 1, the central axis of the raised portions 11 is perpendicular to the mating surface of the tube liner 1, and the raised portions 11 are symmetrical along the mating surface of the tube liner 1. Therefore, when the tube liner 1 is in the mold, the raised portions 11 receive the reaction force from the inner wall of the mold and press the two halves of the tube liner 1 together vertically along the mating surface. The symmetrical raised portions 11 also support the tube liner 1 accordingly to ensure uniform force, and the tube liner 1 only needs symmetrical and consistent raised portions 11 on both sides. If the raised portions 11 on the two halves of the tube liner 1 are staggered from each other along the axial direction, although they can also be positioned in the mold, the tube liner 1 may retain corresponding internal stress after injection molding.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for manufacturing a special-shaped injection molded pipe fitting, characterized in that The following steps are involved:

1. The pipe liner is injection molded in two halves, wherein the two halves of the pipe liner are respectively provided with a matching recess and a plug-in portion at the mating portion, and a raised portion is provided on the outer wall of the pipe liner. The raised portion is an oblate cylindrical portion, and the outer wall of the pipe liner has several raised portions distributed axially. The raised portions are distributed at the top ends of the two halves of the outer wall of the pipe liner, and the central axis of the raised portion is perpendicular to the mating surface of the pipe liner, and the raised portions are symmetrical along the mating surface of the pipe liner; 2. Combining the two halves of the tube liner into a whole liner; 3. The inner shell of the pipe fitting is placed in a mold, the raised portion is in contact with the inner wall of the mold, and the outer shell of the pipe fitting is injected with a secondary rubber coating to obtain a finished pipe fitting.

2. The method for manufacturing a special-shaped injection-molded pipe fitting according to claim 1, characterized in that: The recessed portion is a stepped recess extending along the inner liner of the tube, and the plug-in portion is a stepped protrusion extending along the inner liner of the tube.

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