Silicone tube extrusion die for forming spiral cavity

Abstract

The utility model relates to a silicone tube extrusion die for forming a spiral cavity, which comprises a bottom die, a positioning die, a feeding die core, a forming die, a cylindrical die core for forming a silicone tube central cavity structure and a spiral extrusion die core for forming a spiral constant-temperature cavity structure, a through hole is formed in the front end face of the positioning die, a positioning groove for positioning the spiral extrusion die core is further formed in the periphery of the through hole in the front end face of the positioning die, the spiral axis of the spiral extrusion die core coincides with the axis of the cylindrical die core, a feeding cavity is formed in the center of the feeding die core and is in a funnel shape, and an extrusion opening is formed in the center of the feeding cavity. By means of the spiral extrusion die core, a silica gel material fully occupies a spiral gap of the spiral extrusion die core under strong extrusion and is extruded in a spiral mode under the influence of a spiral structure in the pressurized extrusion forming process, and a constant-temperature cavity on the periphery of a formed silica gel tube is spiral, so that it is guaranteed that the outer wall of a pipeline structure is evenly stressed, local bending is not prone to occurring, and the production process is simple and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of silicone product molds, in particular to a silicone tube extrusion mold for forming a spiral cavity. Background Art

[0002] Silicone products can be seen everywhere in life. Because of their skin-friendly, smooth touch and good feel, they are deeply loved by the majority of friends. They can also be used in biomedicine, children's toys and other fields. Among them, silicone tubes used in biomedicine are countless. There is currently a kind of medical tube with a central cavity circulating medical liquid, and the central cavity is also surrounded by insulation liquid to ensure that the liquid circulating in the tube maintains the required medical temperature. However, the constant temperature cavity where the insulation liquid circulates is mostly a spiral structure. The purpose is to ensure that the outer wall of the pipeline structure is evenly stressed and not prone to local bending. However, most of the traditional production molds can only produce linear constant temperature cavities, and it is difficult to form a spiral structure. In order to facilitate the production of spiral constant temperature cavity structures and improve the production efficiency of such biomedical silicone tubes, it is necessary to design a production mold. Utility Model Content

[0003] The utility model aims to provide a silicone tube extrusion die for molding a spiral cavity, so as to solve the problem that most of the production dies traditionally used in the above-mentioned background technology can only produce linear constant temperature cavities and are difficult to mold spiral constant temperature cavities.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A silicone tube extrusion die for forming a spiral cavity comprises a bottom die, a positioning die, a feeding die core and a forming die, as well as a cylindrical die core for forming a central cavity structure of the silicone tube and a spiral extrusion die core for forming a spiral constant temperature cavity structure.

[0006] The bottom mold, positioning mold, feeding mold core and forming mold are stacked in sequence and are screwed and positioned by positioning studs arranged at the four corners. A cylindrical mold core is sleeved in the center of the bottom mold. A top platform is arranged in the middle of the cylindrical mold core. The top platform is nested in a circular groove arranged in the center of the bottom mold to accurately control the position of the cylindrical mold core.

[0007] The center of the positioning die is provided with a through hole for passing through the cylindrical die core, and the through hole and the cylindrical die core are transitionally matched. The outer periphery of the through hole on the front end surface of the positioning die is also provided with a positioning groove for positioning the spiral extrusion die core. The spiral axis of the spiral extrusion die core coincides with the axis of the cylindrical die core.

[0008] A feeding cavity is arranged at the center of the feeding mold core, which is funnel-shaped and is connected to a feeding channel with external pressurized silicone material. An extrusion port is arranged at the center of the feeding cavity, which is sleeved with a gap between the cylindrical mold core and the spiral extrusion mold core shaft hole. The extrusion port faces the molding port arranged at the center of the molding mold, and the pressurized silicone material is evenly extruded from the molding port to form the required silicone tube.

[0009] Furthermore, the extrusion port coincides with the axis of the cylindrical die core and also coincides with the axis of the spiral extrusion die core.

[0010] Furthermore, the pressurized silicone material fills all the remaining space in the feed cavity and occupies the spiral gap of the spiral extrusion mold core. During the pressurized extrusion molding process, the molded silicone tube is rotated and discharged under the influence of the spiral structure.

[0011] Furthermore, the diameter of the molding port of the molding die is adjusted according to the outer diameter of the silicone tube to be molded to meet the production needs of silicone tubes with more diameters.

[0012] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0013] The silicone tube extrusion die for forming a spiral cavity has an extended spiral extrusion die core, so that the silicone material is forced to fill the spiral gap of the spiral extrusion die core, and is affected by the spiral structure during the pressurized extrusion molding process and is extruded in a spiral manner, so that the constant temperature cavity on the periphery of the molded silicone tube is spiral, thereby ensuring that the outer wall of the pipeline structure is subjected to equal force and is not prone to local bending. The production process is simple, efficient, practical and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the silicone tube described in this embodiment;

[0015] Figure 2 Schematic diagram of the cross section of the silicone tube described in this embodiment;

[0016] Figure 3 It is a three-dimensional schematic diagram of a silicone tube extrusion die for forming a spiral cavity in this embodiment;

[0017] Figure 4 It is a cross-sectional view of a silicone tube extrusion die for forming a spiral cavity in this embodiment;

[0018] Figure 5 Schematic diagram of the structure of the cylindrical mold core and the spiral extrusion mold core described in this embodiment;

[0019] Among them: 1-silicone tube, 2-central cavity, 3-constant temperature cavity, 4-molding mold, 5-feeding mold core, 6-positioning mold, 7-bottom mold, 8-feeding channel, 9-screw positioning hole, 10-molding port, 11-cylindrical mold core, 12-spiral extrusion mold core, 13-top platform, 14-feeding cavity, 15-extrusion port. DETAILED DESCRIPTION

[0020] The technical solution of the present utility model will be described clearly and completely in the following in conjunction with the accompanying drawings in the form of embodiments.

[0021] See also Figure 1-5 The present embodiment provides a technical solution: a silicone tube extrusion die for forming a spiral cavity, comprising a bottom die 7, a positioning die 6, a feeding die core 5 and a forming die 4, as well as a cylindrical die core 11 for forming the structure of the central cavity 2 of such silicone tube 1 and a spiral extrusion die core 12 for forming a spiral constant temperature cavity 3 structure. The bottom die 7, the positioning die 6, the feeding die core 5 and the forming die 4 are stacked in sequence and screwed and positioned by positioning studs arranged at the four corners. The center of the bottom die 7 is sleeved with a cylindrical die core 11, and a top platform 13 is arranged in the middle of the cylindrical die core 11. The top platform 13 is nested in a circular groove arranged in the center of the bottom die 7 to accurately control the position of the cylindrical die core 11.

[0022] In order to ensure that the silicone tube is molded into a precise central cavity 2 and a constant temperature cavity 3, refer to Figure 3 and Figure 4 A through hole for passing through the cylindrical mold core 11 is arranged at the center of the positioning mold 6, and the through hole is transitionally matched with the cylindrical mold core 11. A positioning groove for positioning the spiral extrusion mold core 12 is also arranged on the outer periphery of the through hole on the front end surface of the positioning mold 6, and the spiral axis of the spiral extrusion mold core 12 coincides with the axis of the cylindrical mold core 11.

[0023] See also Figure 4 A feeding cavity 14 is arranged at the center of the feeding mold core 5. The feeding cavity 14 is funnel-shaped and is connected to a feeding channel 8 with the external pressurized silicone material. An extrusion port 15 is arranged at the center of the feeding cavity 14. The extrusion port 15 is sleeved with the axial hole gap of the cylindrical mold core 11 and the spiral extrusion mold core 12. The extrusion port 15 is directly opposite to the molding port 10 arranged at the center of the molding mold 4, and the pressurized silicone material is evenly extruded from the molding port 10 to form the required silicone tube 1.

[0024] See also Figure 4 and Figure 5 The extrusion port 15 coincides with the axis of the cylindrical die core 11 and also coincides with the axis of the spiral extrusion die core 12 .

[0025] A further implementation scheme is that the pressurized silicone material fills all the remaining space in the feed cavity 14 and occupies the spiral gap of the spiral extrusion core 12, and during the pressurized extrusion molding process, the molded silicone tube 1 is rotated and discharged under the influence of the spiral structure.

[0026] In order to meet the production requirements of silicone tubes with different outer diameters, the diameter of the molding port 10 of the molding die 4 is adjusted according to the outer diameter of the silicone tube 1 to be molded to meet the production requirements of silicone tubes 1 with more diameters.

[0027] The above describes in detail the implementation modes of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes. Various changes, modifications, substitutions and variations can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A silicone tube extrusion die for forming a spiral cavity, comprising a bottom die (7), a positioning die (6), a feeding die core (5) and a forming die (4), characterized in that: and a cylindrical mold core (11) for molding the central cavity (2) structure of the silicone tube (1) and a spiral extrusion mold core (12) for molding the spiral constant temperature cavity (3) structure. The bottom mold (7), the positioning mold (6), the feeding mold core (5) and the forming mold (4) are stacked in sequence and are screwed and positioned by positioning studs arranged at the four corners. A cylindrical mold core (11) is sleeved in the center of the bottom mold (7). A top platform (13) is arranged in the middle of the cylindrical mold core (11). The top platform (13) is nested in a circular groove arranged in the center of the bottom mold (7). The center of the positioning die (6) is provided with a through hole for passing through the cylindrical die core (11), and the through hole and the cylindrical die core (11) are transitionally matched. The outer periphery of the through hole on the front end surface of the positioning die (6) is also provided with a positioning groove for positioning the spiral extrusion die core (12), and the spiral axis of the spiral extrusion die core (12) coincides with the axis of the cylindrical die core (11). The center of the feed mold core (5) is provided with a feed cavity (14), which is funnel-shaped and is connected to a feed channel (8) with externally pressurized silicone material. The center of the feed cavity (14) is provided with an extrusion port (15), which is sleeve-matched with the axial holes of the cylindrical mold core (11) and the spiral extrusion mold core (12). The extrusion port (15) faces the molding port (10) provided at the center of the molding mold (4), and the pressurized silicone material is uniformly extruded from the molding port (10) to form the required silicone tube (1).

2. The silicone tube extrusion die for forming a spiral cavity according to claim 1, characterized in that: The extrusion port (15) coincides with the axis of the cylindrical die core (11) and also coincides with the axis of the spiral extrusion die core (12).

3. The silicone tube extrusion die for forming a spiral cavity according to claim 1, characterized in that: The pressurized silicone material fills all the remaining space in the feed cavity (14) and occupies the spiral gap of the spiral extrusion die core (12), and the molded silicone tube (1) is rotated and discharged during the pressurized extrusion molding process.

4. The silicone tube extrusion die for forming a spiral cavity according to claim 1, characterized in that: The diameter of the molding opening (10) of the molding die (4) is adjusted and set according to the outer diameter of the silicone tube (1) to be molded.

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