Extruder die head

Abstract

The utility model relates to the technical field of extruders, in particular to an extruder die head which comprises a main die head and an auxiliary die head, the main die head is fixedly assembled with an extruder head, the main die head is provided with a material cavity communicated with the extruder head and a plurality of first extrusion holes communicated with the material cavity, and the auxiliary die head is connected with the main die head in a sliding and limiting mode. The die head comprises a plurality of extrusion nozzles, each extrusion nozzle is provided with a second extrusion hole, the extrusion nozzles and the auxiliary die head are detachably installed, the extrusion nozzles are provided with second extrusion holes with at least two hole diameters, and the second extrusion holes of the extrusion nozzles can be communicated with the first extrusion holes. According to the device, the dismounting difficulty is reduced, and the manufacturing cost of the device is greatly reduced compared with a plurality of traditional integral die heads because only one main die head is needed as the largest part and is not required to be dismounted.

Description

An extruder die Technical Field

[0001] This utility model relates to the field of extruder technology, and in particular to an extruder die. Background Technology

[0002] In plastic molding equipment, the plastic extruder is an important part of various plastic extrusion molding production lines. It is mainly used to extrude soft and hard thermoplastic plastics such as polyvinyl chloride and polyethylene. When used with corresponding auxiliary machines (including molding heads), it can process a variety of plastic products, such as films, pipes, rods, sheets, filaments, tapes, cable insulation layers and hollow products. It can also be used for granulation to produce various plastic products.

[0003] To facilitate the production of masterbatches of different diameters, an extruder is typically equipped with multiple types of dies. By changing the die at the extruder head, masterbatches of different particle sizes can be produced. In the current technology, the die that needs to be replaced is usually a single, integral die. When replacing it, the entire die needs to be disassembled and replaced from the extruder head. On the one hand, the installation workload is large, and on the other hand, since each type of die is a single, integral die, the overall cost of multiple types of dies is higher. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing die heads, namely, the large workload involved in installation and the higher overall cost due to the use of a single, integrated die head for each model. This invention provides a new extruder die head.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An extruder die head is mounted on an extruder head. The die head includes a main die head and a secondary die head. The main die head is fixedly assembled to the extruder head. The main die head has a material cavity communicating with the extruder head and a plurality of first extrusion orifices communicating with the material cavity. The secondary die head is slidably limited to the main die head. The die head includes a plurality of extrusion nozzles, each of which has a second extrusion orifice. The extrusion nozzles are detachably mounted to the secondary die head. The plurality of extrusion nozzles have at least two types of second extrusion orifices with different orifice diameters. The second extrusion orifices of the extrusion nozzles can communicate with the first extrusion orifices.

[0007] The secondary die head is provided with threaded through holes at the corresponding positions of each first extrusion hole. The extrusion nozzle is a cylindrical tube with an external thread at one end, which is threaded into the threaded through hole.

[0008] The first extrusion orifice has a stepped end face, and the extrusion nozzle end face can abut against the stepped end face.

[0009] The main mold head has a mounting groove, and the secondary mold head has vertically arranged slide rails on both sides. The secondary mold head can be slidably installed in the mounting groove from top to bottom, or the secondary mold head can be slidably detached from the mounting groove from bottom to top.

[0010] The main die head has a flange, and the main die head is fixed to the extruder head by the flange and bolt assembly.

[0011] The first extrusion orifice is a round orifice, the second extrusion orifice has a circular or polygonal cross-section, and the diameter of the second extrusion orifice is less than or equal to the diameter of the first extrusion orifice.

[0012] The present invention provides an extruder die head with the following advantages: the main die head is fixed to the extruder head, while the auxiliary die head is detachable from the main die head. The extrusion nozzle is mounted on the auxiliary die head. Each time a die head with a different orifice diameter needs to be replaced, only the auxiliary die head along with the extrusion nozzle needs to be removed from the main die head. It is not necessary to remove the main die head from the extruder head, which reduces the difficulty of disassembly. Since the largest component, the main die head, only needs to be one and does not need to be disassembled, the manufacturing cost of this device is greatly reduced compared to traditional multi-piece integral die heads. Attached Figure Description

[0013] Figure 1 is a schematic diagram of the separated structure of this utility model;

[0014] Figure 2 is a schematic diagram of the structure after the main mold head and the auxiliary mold head of this utility model are connected;

[0015] Figure 3 is a cross-sectional view of the main mold head and the auxiliary mold head of this utility model;

[0016] Figure 4 is a schematic diagram of the sub-mold head structure of this utility model;

[0017] Figure 5 is a schematic diagram of the structure of the die head and extruder head after assembly.

[0018] In the figure: 1. Main die head, 2. Flange, 3. Mounting groove, 4. First extrusion hole, 5. Stepped end face, 6. Secondary die head, 7. Slide rail, 8. Extrusion nozzle, 9. Hexagonal head, 10. Second extrusion hole, 11. Material cavity, 12. Threaded through hole, 13. Extruder head. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Referring to Figures 1-5, an extruder die head is installed on an extruder head 13. The die head includes a main die head 1 and a secondary die head 6. The main die head 1 is fixedly assembled with the extruder head 13. The main die head 1 has a material cavity 11 communicating with the extruder head 13 and several first extrusion holes 4 communicating with the material cavity 11. The molten material from the extruder head 13 is fed into the material cavity 11 and then distributed to the multiple first extrusion holes 4 through the material cavity 11. The secondary die head 6 is slidably limited to the main die head 1. The secondary die head 6 is slidably connected to the main die head 1 and limitedly assembled together. The die head includes several extrusion nozzles 8, each extrusion nozzle 8 having a second extrusion hole 10. The extrusion nozzles 8 and the secondary die head 6 are detachably installed to facilitate the replacement of different extrusion nozzles 8. The several extrusion nozzles 8 have at least two types of second extrusion holes 10 with different orifice diameters. By setting multiple orifice diameters of second extrusion holes 10, it is possible to handle masterbatches of different diameters. The second extrusion holes 10 of the extrusion nozzles 8 can communicate with the first extrusion holes 4.

[0021] The entire die head of this device includes a main die head 1, a secondary die head 6, and multiple extrusion nozzles 8. The main die head 1 is fixed to the extruder head 13, while the secondary die head 6 is detachable from the main die head 1. The extrusion nozzles 8 are assembled on the secondary die head 6. Each time a die head with a different orifice diameter needs to be replaced, the secondary die head 6 along with the extrusion nozzles 8 only needs to be removed from the main die head 1. It is not necessary to remove the main die head 1 from the extruder head 13, which reduces the difficulty of disassembly. Furthermore, since only the secondary die head 6 and multiple extrusion nozzles 8 need to be replaced, or only the secondary die head 6 needs to be disassembled and different extrusion nozzles 8 replaced, only one secondary die head 6 and multiple sets of extrusion nozzles 8, or multiple secondary die heads 6 and multiple extrusion nozzles 8, need to be manufactured. Since the largest component, the main die head 1, only needs to be one and does not need to be disassembled, the manufacturing cost of this device is greatly reduced compared to traditional multi-piece integral die heads.

[0022] As one implementation method, referring to Figure 3, the auxiliary die head 6 is provided with threaded through holes 12 at the corresponding positions of each first extrusion hole 4. The extrusion nozzle 8 is a cylindrical tube with an external thread at one end. The external thread is threadedly engaged with the threaded through hole 12. By rotating the extrusion nozzle 8, one end of the extrusion nozzle 8 abuts against the end of the first extrusion hole 4, so that the first extrusion hole 4 and the second extrusion hole 10 are connected. This installation method is relatively simple.

[0023] In one embodiment, the end of the extrusion nozzle 8 away from the external thread is provided with a hexagonal head 9, which facilitates the rotation of the extrusion nozzle 8.

[0024] The first extrusion hole 4 has a stepped end face 5 at its end, and the end face of the extrusion nozzle 8 can abut against the stepped end face 5, which improves the ease of connection and sealing between the first extrusion hole 4 and the second extrusion hole 10.

[0025] The main mold head 1 has a mounting groove 3, and the auxiliary mold head 6 has vertically arranged slide rails 7 on both sides. The auxiliary mold head 6 can be slidably installed in the mounting groove 3 from top to bottom, or the auxiliary mold head 6 can be slidably detached from the mounting groove 3 from bottom to top. Referring to Figure 1, the mounting groove 3 and the auxiliary mold head adopt a convex structure to fit together. After the auxiliary mold head 6 slides into the mounting groove 3 of the main mold head 1, the extrusion nozzle 8 is rotated so that the end of the extrusion nozzle 8 abuts against the stepped end face 5 of the first extrusion hole 4, and they are tightly abutted together to prevent the molten plastic fluid from overflowing from the joint position.

[0026] Furthermore, this device uses the secondary die head 6 as an intermediate connecting part between the first extrusion hole 4 of the main die head 1 and the extrusion nozzle 8. On the one hand, this makes the extrusion nozzle 8 and the secondary die head 6 more integrated, avoiding the problem of easy loss of parts. On the other hand, if the first extrusion hole 4 is set as a threaded hole and the extrusion nozzle 8 is directly threaded to the first extrusion hole 4 of the main die head 1, since the first extrusion hole 4 of the main die head 1 connects to the melting chamber of the extruder head 13, the threaded wall of the first extrusion hole 4 is easily blocked by dirt, such as stagnant plastic fluid or dust, when disassembling, replacing or repairing the extrusion nozzle 8. The dirt is difficult to clean the threaded seam, affecting the subsequent sealing assembly. However, in this device, the threaded part is set on the secondary die head 6, and the first extrusion hole 4 is a circular smooth wall. When disassembling, the extrusion nozzle 8 is simply twisted backward a short distance so that the secondary die head 6 can be pulled upward. When pulling out the secondary die head 6, the extrusion nozzle 8 is pulled out together. In this way, the first extrusion hole 4 is easy to clean, and the threaded through hole 12 of the secondary die head 6 will not be blocked by molten plastic fluid. Even if it is blocked, it is easy to clean.

[0027] The main die head 1 has a flange 2. The main die head 1 is fixed to the extruder head 13 by the flange 2 and bolt assembly. The main die head 1 is fixed to the extruder head 13 by the flange 2 and bolt assembly. This fixing method is a conventional fixing method.

[0028] The first extrusion hole 4 is a round hole, and the second extrusion hole 10 has a circular or polygonal cross-section. The diameter of the second extrusion hole 10 is less than or equal to the diameter of the first extrusion hole 4, which facilitates the fluid to fill the entire second extrusion hole 10 and makes it easier to extrude the plastic strip.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technical solution, concept, or design obtained by those skilled in the art by making equivalent substitutions or changes based on the technical solution and utility model concept disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An extruder die head, said die head being mounted on an extruder die head (13), characterized in that, The die head includes a main die head (1) and a secondary die head (6). The main die head (1) is fixedly assembled with the extruder head (13). The main die head (1) has a material cavity (11) communicating with the extruder head (13) and several first extrusion holes (4) communicating with the material cavity (11). The secondary die head (6) is slidably limited connected to the main die head (1). The die head includes several extrusion nozzles (8). Each extrusion nozzle (8) has a second extrusion hole (10). The extrusion nozzles (8) and the secondary die head (6) are detachably installed. The several extrusion nozzles (8) have at least two types of second extrusion holes (10). The second extrusion holes (10) of the extrusion nozzles (8) can communicate with the first extrusion holes (4).

2. An extruder die according to claim 1, wherein The sub-die head (6) is provided with threaded through holes (12) at the corresponding positions of each first extrusion hole (4). The extrusion nozzle (8) is a cylindrical tube. One end of the extrusion nozzle (8) has an external threaded part, which is threadedly engaged with the threaded through hole (12).

3. An extruder die head according to claim 2, characterized in that, The first extrusion orifice (4) has a stepped end face (5) at its end, and the end face of the extrusion nozzle (8) can abut against the stepped end face (5).

4. An extruder die head according to any one of claims 1-3, characterized in that, The main mold head (1) has a mounting groove (3), and the auxiliary mold head (6) has vertically arranged slide rails (7) on both sides. The auxiliary mold head (6) can be slidably installed in the mounting groove (3) from top to bottom, or the auxiliary mold head (6) can be slidably disengaged from the mounting groove (3) from bottom to top.

5. An extruder die head according to any one of claims 1-3, characterized in that, The main die head (1) has a flange (2), and the main die head (1) is fixed to the extruder head (13) by the flange (2) and bolt assembly.

6. An extruder die head according to any one of claims 1-3, characterized in that, The first extrusion hole (4) is a round hole, and the cross-section of the second extrusion hole (10) is circular or polygonal. The diameter of the second extrusion hole (10) is less than or equal to the diameter of the first extrusion hole (4).

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