Multi-layer extrusion die

Abstract

The utility model discloses a multi-layer extrusion die which comprises a main-layer spiral body and a coating body group, an outer shell is sleeved outside the main-layer spiral body, and a plurality of first main spiral flow channels are formed in the main-layer spiral body; the coating body group is connected with the outer shell, so that the coating body group is connected with the main layer spiral body, the coating body group is formed by sleeving a plurality of coating spiral bodies, the inner diameters of the plurality of coating spiral bodies are sequentially increased, the inner diameter of the coating spiral body positioned on the outer layer is larger than that of the coating spiral body positioned on the inner layer, the coating spiral bodies are conical, and the inner diameter of the coating spiral body positioned on the outer layer is larger than that of the coating spiral body positioned on the inner layer. A main runner is arranged on the outer wall of the coating spiral body, the tail end of the coating spiral body is sleeved with the fixing ring, and a feeding port is formed in the fixing ring; according to the number of pipe coatings, the number of coating spiral bodies is selected, and the coating spiral bodies are sleeved to form a coating body group; and meanwhile, the coating spiral body is conical, so that the flow path of the main runner is lengthened, the flow speed of materials is ensured to be stable, material accumulation is avoided, the pressure of a mold is reduced, the requirement of high-speed production is met, and the product quality is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a multi-layer extrusion mold. Background Art

[0002] In existing pipeline manufacturing, when producing multi-layer polymer pipes, multiple layers of flat spirals are stacked and installed in sequence. The flat spirals have spiral flow channels. However, due to the short flow channels on the flat spirals, material accumulation is prone to occur, and the coating is prone to exceed the preset thickness, affecting the quality of the pipe. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an embodiment of the present invention proposes a multi-layer extrusion die, comprising a main layer spiral, a coating body group, an outer shell sleeved on the main layer spiral, a plurality of first main spiral flow channels being opened on the main layer spiral; the coating body group is connected to the outer shell so that the coating body group is connected to the main layer spiral, the coating body group is composed of a plurality of coating spirals fitted together, the inner diameters of the plurality of coating spirals increase successively, and the inner diameter of the coating spiral located in the outer layer is larger than the inner diameter of the coating spiral located in the inner layer, the coating spiral is conical, a main flow channel is provided on the outer wall of the coating spiral, the fixing ring is sleeved on the tail end of the coating spiral, a feed port is provided on the fixing ring, and the feed port is communicated with the main flow channel.

[0004] The utility model has at least the following beneficial effects:

[0005] 1. According to the number of coating layers on the pipe, select the appropriate number of coating spirals and put them together to form a coating group;

[0006] 2. The coating spiral is tapered, which lengthens the flow of the main channel, ensures the stability of the material flow rate, avoids material accumulation, and reduces the pressure on the mold to meet the requirements of high-speed production and ensure product quality.

[0007] According to some embodiments of the present invention, a branch flow channel is further provided on the fixing ring, and the branch flow channel is used to connect the main flow channel with the feed port.

[0008] According to some embodiments of the present invention, the main flow channel is provided in two groups, and the branch flow channel is provided with two discharge ports, and the two discharge ports lead to one group of the main flow channel respectively.

[0009] According to some embodiments of the present invention, the main channel includes a first branch channel, a second branch channel, and a second main spiral channel. The first branch channel is connected to the feed port, the first branch channel is connected to the second branch channel, and the second branch channel is connected to the second main spiral channel.

[0010] According to some embodiments of the present invention, two first diversion ports are provided on the first branch flow channel, and the two first diversion ports respectively lead to a second branch flow channel; two second diversion ports are provided on the second branch flow channel, and the two second diversion ports respectively lead to a second main spiral flow channel.

[0011] According to some embodiments of the present invention, a plurality of material distribution openings are provided at the tail end of the main layer spiral body, and the plurality of material distribution openings are respectively communicated with one of the first main spiral flow channels.

[0012] According to some embodiments of the present invention, a mold core is further included, the tail end of the mold core is connected to the main layer spiral body, and the covering body is assembled on the mold core.

[0013] According to some embodiments of the present invention, a discharge flow channel is further included, and the discharge flow channel is communicated with the first main spiral flow channel and the main flow channel.

[0014] According to some embodiments of the present invention, a light-enhancing ring is mounted on the end of the front end of the mold core.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic cross-sectional view of an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of a coated spiral according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the main layer spiral body of an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0022] In the description of this utility model, "a plurality" means more than two, and "greater than," "less than," "exceed," etc. are understood to exclude the number itself. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number or order of the technical features indicated.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] Reference Figure 1 A multi-layer extrusion die comprises a main layer spiral body 100, a coating body group 201, and an outer shell 300 is sleeved on the outer surface of the main layer spiral body 100, and a plurality of first main spiral flow channels 110 are opened on the main layer spiral body 100; the coating body group 201 is connected to the outer shell 300, so that the coating body group 201 is connected to the main layer spiral body 100, and the coating body group 201 is composed of a plurality of coating spiral bodies 200 that are sleeved together. The inner diameters of the plurality of coating spirals 200 increase successively, and the inner diameter of the coating spiral 200 located in the outer layer is larger than the inner diameter of the coating spiral 200 located in the inner layer. The coating spiral 200 is conical, and a main flow channel 210 is provided on the outer wall of the coating spiral 200. The fixing ring 220 is sleeved on the tail end of the coating spiral 200, and a feed port 221 is provided on the fixing ring 220, and the feed port 221 is communicated with the main flow channel 210.

[0025] According to the number of coating layers on the pipe, the number of coating body groups 201 or the number of coating spirals 200 is selected and assembled to form the coating body group 201; at the same time, the coating spirals 200 are tapered, which lengthens the flow of the main channel 210, ensures a stable flow rate of the material, avoids material accumulation, and reduces the pressure on the mold to meet the requirements of high-speed production and ensure product quality.

[0026] Reference Figure 3As shown, the main channel 210 includes a first branch channel 211, a second branch channel 212, and a second main spiral channel 213. The first branch channel 211 is connected to the feed port 221, the first branch channel 211 is connected to the second branch channel 212, and the second branch channel 212 is connected to the second main spiral channel 213.

[0027] The first branch channel 211 is provided with two first diversion openings 2111 , each leading to a second branch channel 212 ; the second branch channel 212 is provided with two second diversion openings 2121 , each leading to a second main spiral channel 213 .

[0028] Through the above arrangement, the path for the material to pass is extended, and the material is diverted through the bifurcated path, thereby reducing the amount of material entering the single second main spiral flow channel 213, thereby maintaining a stable flow rate and avoiding material accumulation.

[0029] Reference Figure 1 、 3 As shown, a plurality of feed openings 120 are provided at the tail end of the main layer spiral body 100, and the plurality of feed openings 120 are respectively communicated with a first main spiral flow channel 110. The material enters the first main spiral flow channel 110 through the feed openings 120 to ensure the stability of the material flow rate. At the same time, the main body material enters the discharge flow channel 500 from the first main spiral flow channel 110, and cooperates with the mold core 400 to form the tube blank body. The coating material enters the discharge flow channel 500 from the second main spiral flow channel 213 in the main channel 210, and covers the surface of the main tube blank to form a multi-layer tube blank.

[0030] Throughout this specification, references to the terms "some embodiments" or "it is contemplated that" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0031] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A multi-layer extrusion die, characterized in that: include: A main layer spiral body (100), wherein the main layer spiral body (100) is covered with an outer shell (300), and a plurality of first main spiral flow channels (110) are formed on the main layer spiral body (100); A coating body group (201), wherein the coating body group (201) is connected to the outer shell (300), so that the coating body group (201) is connected to the main layer spiral body (100), and the coating body group (201) is composed of a plurality of coating spiral bodies (200) that are nested together, and the inner diameters of the plurality of coating spiral bodies (200) increase in sequence, and the inner diameter of the coating spiral body (200) located in the outer layer is larger than the inner diameter of the coating spiral body (200) located in the inner layer, The coating spiral (200) is conical, and a main flow channel (210) is provided on the outer wall of the coating spiral (200). A fixing ring (220) is sleeved on the tail end of the coating spiral (200), and a feed port (221) is provided on the fixing ring (220). The feed port (221) is communicated with the main flow channel (210).

2. A multi-layer extrusion die according to claim 1, characterized in that: Two of the coating spiral bodies (200) are used, and the two coating spiral bodies (200) are sequentially nested and fixed to the outer shell (300).

3. A multi-layer extrusion die according to claim 1, characterized in that: The main flow channel (210) comprises a first branch flow channel (211), a second branch flow channel (212), and a second main spiral flow channel (213); the first branch flow channel (211) is connected to the feed port (221); the first branch flow channel (211) is connected to the second branch flow channel (212); and the second branch flow channel (212) is connected to the second main spiral flow channel (213).

4. A multi-layer extrusion die according to claim 3, characterized in that: The first branch flow channel (211) is provided with two first branch openings (2111), and the two first branch openings (2111) respectively lead to a second branch flow channel (212); the second branch flow channel (212) is provided with two second branch openings (2121), and the two second branch openings (2121) respectively lead to a second main spiral flow channel (213), thereby improving the flow rate of the material during the injection molding production process and avoiding material accumulation.

5. A multi-layer extrusion die according to claim 1, characterized in that: The tail end of the main layer spiral body (100) is provided with a plurality of material distribution openings (120), and the plurality of material distribution openings (120) are respectively communicated with one of the first main spiral flow channels (110).

6. A multi-layer extrusion die according to claim 1, characterized in that: It also includes a mold core (400), the tail end of the mold core (400) is connected to the main layer spiral body (100), and the coating body group (201) is sleeved on the mold core (400).

7. A multi-layer extrusion die according to claim 1, characterized in that: It also includes a discharge flow channel (500), wherein the discharge flow channel (500) is in communication with the first main spiral flow channel (110) and the main flow channel (210).

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