Three-layer co-extrusion die

Abstract

The utility model discloses a three-layer co-extrusion die which comprises a die part and a distribution part used for uniform extrusion, one side of the distribution part is communicated with the die part, the other side of the distribution part is provided with pipeline devices which can be respectively connected with three extrusion production lines, and the die part comprises an extrusion die head and fixing pieces which are respectively arranged on two sides of the extrusion die head. Three first runners are uniformly arranged in the extrusion die head at intervals, the distribution part comprises a distributor mounted on the upper end surface of the extrusion die head, three second runners are arranged in the distributor at intervals, one end of each second runner is communicated with the pipeline device, and the other end of each second runner is communicated with the corresponding first runner, so that the precision of the runners can be ensured during processing; and after the molten mass passes through the pipeline device, the molten mass can be uniformly extruded through the distributor, so that overflow in the extrusion process is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of mold manufacturing, and more specifically relates to a three-layer co-extrusion mold. Background Art

[0002] The die is designed so that two materials flow along independent flow channels, converge near the die outlet, and are extruded together. When melts with different rheological properties are co-extruded through a common flow channel, a multi-layer flow is formed. Co-extruded products with different functions require completely different technical indicators of the co-extruded layers on the profile, thus placing different requirements on the co-extrusion die head design.

[0003] The current difficulty in the processing of three-layer co-extrusion molds is how to ensure the accuracy of the flow channel during processing while also considering the overflow problem that may be caused by the pressure in the flow channel during the extrusion process. Utility Model Content

[0004] The main purpose of the utility model is to provide a three-layer co-extrusion die which can ensure the accuracy of the flow channel during processing and solve the problem of overflow during the extrusion process.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:

[0006] A three-layer co-extrusion die comprises a die portion and a distribution portion for uniform extrusion, wherein one side of the distribution portion is connected to the die portion, and the other side of the distribution portion is provided with a pipeline device that can be connected to three extrusion production lines respectively. The die portion comprises an extrusion die head and fixing parts respectively arranged on both sides of the extrusion die head, three first flow channels are evenly spaced in the extrusion die head, the distribution portion comprises a distributor installed on the upper end surface of the extrusion die head, three second flow channels are spaced in the distributor, one end of each second flow channel is connected to the pipeline device, and the other end of each second flow channel is connected to the corresponding first flow channel.

[0007] In a specific embodiment of the present invention, the distribution part also includes a main elbow movably connected to the upper end surface of the distributor, and the two sides and the upper end surface of the distributor are respectively provided with a first interface and a second interface, and the main elbow is connected to the second interface.

[0008] In a specific embodiment of the present invention, a guide groove is provided between each first interface and the corresponding second flow channel.

[0009] In a specific embodiment of the present invention, a plurality of air holes are evenly spaced on the surface of the dispenser.

[0010] In a specific embodiment of the present invention, the mold portion further comprises a plurality of spacers which are spaced apart and arranged on the upper end surface of the extrusion die head, and the plurality of spacers are respectively located on both sides of the distributor.

[0011] In a specific embodiment of the present invention, a plurality of threaded holes for fixing the spacer blocks are provided at intervals on the upper end surface of the extrusion die head.

[0012] In a specific embodiment of the present invention, the pipeline device includes three connectors that can be connected to the extrusion production line respectively and a plurality of connecting pipes for connecting the connectors and the distributor, and adjacent connecting pipes are connected by secondary elbows.

[0013] In a specific embodiment of the present invention, a screen changer is provided between each of the connectors and the distributor, and the screen changer includes a driving device and a slide arranged at the output end of the driving device, and the slide is arranged perpendicular to the side of the screen changer.

[0014] In a specific embodiment of the present invention, at least two filter plates are arranged in parallel on the slide plate.

[0015] In a specific embodiment of the present invention, the extrusion die head is arranged vertically downward, the fixing piece is threadedly connected to the extrusion die head, and the fixing piece is tapered.

[0016] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0017] The utility model arranges mold parts and pipeline devices on both sides of the distribution part for communication, and then evenly arranges three first flow channels in the extrusion die head and three second flow channels in the distributor, further connects one end of each second flow channel with the pipeline device, and the other end of each second flow channel with the corresponding first flow channel, so that the accuracy of the flow channel can be guaranteed during processing, and after the molten body passes through the pipeline device, it can be uniformly extruded through the distributor, thereby preventing overflow during the extrusion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Attachment Figure 1 This is an overall structural diagram of an embodiment of the utility model;

[0020] Attachment Figure 2 A side view of an embodiment of the present invention;

[0021] Attachment Figure 3 A top view of an embodiment of the present invention;

[0022] Attachment Figure 4 This is a partial structural diagram of an embodiment of the utility model;

[0023] Attachment Figure 5 This is an exploded view of a mold portion according to an embodiment of the present invention;

[0024] Attachment Figure 6 An exploded view of a dispenser according to an embodiment of the present invention;

[0025] Attachment Figure 7 A side view of an extrusion die head according to an embodiment of the present invention;

[0026] Attachment Figure 8 This is a cross-sectional view taken along the AA direction of an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals 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 only used to explain the present invention, and should not be understood as limiting the present invention.

[0028] 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.

[0029] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0032] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0033] Refer to the attached Figure 1 To the attached Figure 8 As shown, a three-layer co-extrusion die includes a die portion 1, a pipeline device 3 and a distribution portion 2 for uniform extrusion. One side of the distribution portion 2 is connected to the die portion 1, and the other side of the distribution portion 2 is provided with a pipeline device 3 that can be connected to three extrusion production lines respectively.

[0034] In one embodiment of the present invention, the mold portion 1 includes an extrusion die 11, four pads 13 spaced apart on the upper end surface of the extrusion die 11, and fixing parts 12 respectively arranged on both sides of the extrusion die 11. The extrusion die 11 is arranged vertically downward, and three first flow channels 111 are evenly spaced inside the extrusion die 11. The four pads 13 are respectively located on both sides of the distributor 21.

[0035] In one embodiment of the present invention, the fixing member 12 is tapered and is threadedly connected to the extrusion die 11 . In addition, eight threaded holes 112 for fixing the spacer 13 are provided at intervals on the upper end surface of the extrusion die 11 .

[0036] In one embodiment of the present invention, the distribution part 2 includes a distributor 21 installed on the upper end surface of the extrusion die 11 and a main elbow 22 movably connected to the upper end surface of the distributor 21. The two sides and the upper end surface of the distributor 21 are respectively provided with a first interface 4 and a second interface 5, and the main elbow 22 is connected to the second interface 5.

[0037] In one embodiment of the present invention, a plurality of air vents 212 for rapid cooling are evenly spaced apart on the surface of the distributor 21, and three second flow channels 211 are spaced apart inside the distributor 21. One end of each second flow channel 211 is connected to the pipeline device 3, and the other end of each second flow channel 211 is connected to the corresponding first flow channel 111, so that the accuracy of the flow channel can be ensured during processing, and after the melt passes through the pipeline device 3, it can be uniformly extruded through the distributor 21, thereby preventing overflow during the extrusion process.

[0038] In one embodiment of the present invention, a guide groove 6 is provided between each first interface 4 and the corresponding second flow channel 211. After the molten extrudate enters the first interface 4, it can flow into the corresponding second flow channel 211 through the guide groove 6, and then flow into the corresponding first flow channel 111 for extrusion molding.

[0039] In one embodiment of the present invention, the pipeline device 3 includes three connectors 31 that can be connected to the extrusion production line respectively and several pipes 32 for connecting the connectors 31 and the distributor 21. Adjacent pipes 32 are connected by secondary elbows 7, so that they can adapt to various complex installation environments.

[0040] In one embodiment of the present invention, a screen changer 8 is provided between each joint 31 and the distributor 21. The screen changer 8 includes a driving device and a slide arranged at the output end of the driving device. The driving device can drive the slide to perform reciprocating motion in the screen changer 8.

[0041] In one embodiment of the present invention, a slide is arranged perpendicular to the side of the screen changer 8, and two filter plates are arranged in parallel on the slide, one for working and the other for standby. When the filter screen needs to be replaced, the driving device is started to realize the station switching, the dirty screen is pushed out, and the standby station is then entered, thereby completing the entire screen changing process.

[0042] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A three-layer co-extrusion die, characterized in that: The invention comprises a die portion (1) and a distribution portion (2) for uniform extrusion, wherein one side of the distribution portion (2) is connected to the die portion (1), and the other side of the distribution portion (2) is provided with a pipeline device (3) which can be respectively connected to three extrusion production lines, the die portion (1) comprises an extrusion die head (11) and fixing members (12) respectively arranged on both sides of the extrusion die head (11), three first flow channels (111) are evenly spaced in the extrusion die head (11), the distribution portion (2) comprises a distributor (21) installed on the upper end surface of the extrusion die head (11), and three second flow channels (211) are spaced in the distributor (21), one end of each second flow channel (211) is connected to the pipeline device (3), and the other end of each second flow channel (211) is connected to the corresponding first flow channel (111).

2. The three-layer co-extrusion die according to claim 1, characterized in that: The distribution portion (2) further comprises a main elbow (22) movably connected to the upper end surface of the distributor (21); both sides and the upper end surface of the distributor (21) are respectively provided with a first interface (4) and a second interface (5); the main elbow (22) is in communication with the second interface (5).

3. The three-layer co-extrusion die according to claim 2, characterized in that: A guide groove (6) is provided between each first interface (4) and the corresponding second flow channel (211).

4. The three-layer co-extrusion die according to claim 2, characterized in that: The surface of the distributor (21) is also provided with a plurality of air holes (212) at even intervals.

5. The three-layer co-extrusion die according to claim 1, characterized in that: The mold part (1) further comprises a plurality of spacers (13) arranged at intervals on the upper end surface of the extrusion die head (11), and the plurality of spacers (13) are respectively located on both sides of the distributor (21).

6. The three-layer co-extrusion die according to claim 5, characterized in that: The upper end surface of the extrusion die head (11) is also provided with a plurality of threaded holes (112) for fixing the cushion block (13) at intervals.

7. The three-layer co-extrusion die according to claim 1, characterized in that: The pipeline device (3) includes three connectors (31) that can be connected to the extrusion production line respectively and a plurality of connecting pipes (32) for connecting the connectors (31) and the distributor (21), and adjacent connecting pipes (32) are connected by secondary elbows (7).

8. The three-layer co-extrusion die according to claim 7, characterized in that: A screen changer (8) is provided between each of the connectors (31) and the distributor (21). The screen changer (8) comprises a driving device and a slide plate provided at the output end of the driving device. The slide plate is provided perpendicular to the side of the screen changer.

9. The three-layer co-extrusion die according to claim 8, characterized in that: At least two filter plates are arranged in parallel on the slide plate.

10. The three-layer co-extrusion die according to claim 1, characterized in that: The extrusion die head (11) is arranged vertically downward, the fixing piece (12) is threadedly connected to the extrusion die head (11), and the fixing piece (12) is tapered.

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