Machine head inner die of plastic extruder

Abstract

The utility model relates to the technical field of extruders, in particular to a machine head inner mold of a plastic extruder, which comprises an insertion part connected with a machine head and a guide part, a feeding channel is arranged in the insertion part, the guide part is arranged on one side of the insertion part, and a guide hole is arranged on the guide part; a connecting sleeve is arranged on the inserting part, the connecting sleeve is detachably connected with the machine head, a connecting part is arranged on the guiding part, a connecting groove is formed in the side, close to the guiding part, of the inserting part, and the connecting part is detachably connected with the connecting groove. When the inner mold is worn, the worn inner mold can be taken down for replacement, when the inner mold passes through the conductor, the conductor is in contact with the guide part, so that the wear of the guide part is faster than that of the insertion part, and the inner mold is divided into the insertion part and the guide part, so that the guide part can be taken down independently for replacement.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to an inner die of the head of a plastic extruder. Background Art

[0002] In the current technology, an extruder extrudes rubber or molten plastic through the action of a screw and extrudes it through an extrusion outlet with a fixed shape. After being stretched by a tractor and cooled and shaped by water cooling, it is then cut. This equipment is mainly used for large-scale continuous production of various products with the same cross-section, such as pipes, rods, profiled materials, etc. In addition, the extruder can also be used in processes such as rubber modification, rubber particle production, and plastic modification and pelletization. By reasonably using the extruder, production efficiency can be improved and the product quality can be ensured to meet the requirements.

[0003] The existing extruder head usually consists of an inner die and an outer die. The inner die is used to lead out the conductor, and the outer die is used to inject the insulating material and coat the insulating material on the conductor to form an insulating layer. For example, Chinese Patent Publication No. CN214645737U discloses "a plastic extruder head", which is provided with a conductor channel for threading the conductor. The conductor advances along the direction of the first inner hole, and the plastic fluid enters from the first flow channel, passes through the second flow channel and the third flow channel in sequence, and finally extrudes from the first inner hole and is evenly coated on the conductor moving forward. By setting the first inner hole to be concentric with the conductor channel, the plastic fluid extruded from the first inner hole can evenly cover the outer surface of the conductor;

[0004] However, in actual use, when the inner die leads the conductor, the inner wall of the inner die will contact the conductor and generate friction. Long-term use will cause wear of the inner die, affecting the product quality and dimensional stability. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the disadvantages in the prior art that when the inner die leads the conductor, the inner wall of the inner die will contact the conductor and generate friction, and long-term use will cause wear of the inner die, etc., and to propose an inner die of the head of a plastic extruder.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] Design an inner die of the head of a plastic extruder, including a plug-in part connected to the head and a guiding part. An inlet channel is opened in the plug-in part, and the guiding part is arranged on one side of the plug-in part and a guiding hole is opened on the guiding part;

[0008] A connecting sleeve is provided on the plugging part. The connecting sleeve is detachably connected to the machine head. A connecting part is provided on the guiding part. A connecting groove is provided on one side of the plugging part close to the guiding part. The connecting part is detachably connected to the connecting groove.

[0009] Further, an extending part is fixedly provided in the connecting groove. The extending part abuts against the guiding part.

[0010] Further, a wear-resistant sleeve is provided in the guiding part. A guiding tube matching with the guiding hole is provided on one side of the wear-resistant sleeve.

[0011] Further, an installation groove is provided on one side of the guiding part close to the extending part. An installation part matching with the installation groove is fixedly provided on the wear-resistant sleeve.

[0012] Further, internal threads are provided on the inner wall of the connecting sleeve and the inner wall of the connecting groove, so as to be threadedly connected to the machine head or the connecting part.

[0013] Further, grooves are provided on both sides of the outer wall of the guiding part. The two grooves are arranged oppositely so that the guiding part can be clamped by a wrench.

[0014] The beneficial effects of the inner die of the machine head of a plastic extruder proposed by the present utility model are as follows:

[0015] In the present utility model, by providing that the connecting sleeve is detachably connected to the machine head, the worn inner die can be removed for replacement. When passing a conductor, the conductor will contact the guiding part, resulting in faster wear of the guiding part than that of the plugging part. And the inner die is divided into a plugging part and a guiding part, and the guiding part can be separately removed for replacement;

[0016] Secondly, in the present utility model, by providing a wear-resistant sleeve in the guiding part, the wear resistance of the guiding part is increased. When the wear-resistant sleeve is severely worn, the wear-resistant sleeve can be removed for replacement, avoiding wear caused by overall replacement. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the inner die of the machine head of a plastic extruder proposed by the present utility model;

[0018] Figure 2 is a schematic structural diagram of the groove of the present utility model;

[0019] Figure 3 is a schematic structural diagram of the connecting sleeve of the present utility model;

[0020] Figure 4 is a schematic structural diagram of the wear-resistant sleeve of the present utility model.

[0021] In the figure: 1. Plug-in part; 11. Connecting sleeve; 2. Guiding part; 21. Connecting portion; 22. Connecting groove; 23. Extension portion; 24. Wear-resistant sleeve; 25. Guiding tube; 26. Mounting portion; 3. Guiding hole; 4. Groove. Detailed implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Refer to Figures 1-4 , an inner die of the head of a plastic extruder, including a plug-in part 1 connected to the head and a guiding part 2. A feeding channel is provided in the plug-in part 1, and the guiding part 2 is arranged on one side of the plug-in part 1 and a guiding hole 3 is provided on the guiding part 2;

[0024] A connecting sleeve 11 is provided on the plug-in part 1. The connecting sleeve 11 is detachably connected to the head. A connecting portion 21 is provided on the guiding part 2, and a connecting groove 22 is provided on one side of the plug-in part 1 close to the guiding part 2. The connecting portion 21 is detachably connected to the connecting groove 22.

[0025] In the present invention, the plug-in part 1 and the guiding part 2 are detachably connected to the head through the detachable connection of the connecting sleeve 11 and the head, so that the worn inner die can be removed and replaced. In this embodiment, the inner diameter of the feeding channel is 8 mm, the cross-section of the plug-in part 1 is a trapezoidal structure, the length of the lower base of the trapezoidal structure is 17 + 0.02 mm, the included angle between the waist and the lower base of the trapezoidal structure is 85 degrees, the height of the trapezoidal structure is 32 mm, the total length of the plug-in part 1 and the guiding part 2 is 52 mm, and the connecting sleeve 11 is threadedly connected to the head of the extruder to fix the inner die. When producing XLPE rubber-insulated wires, because the rubber is sticky and there are gaps in the conductor formed by mutual twisting, the rubber will be embedded in the gaps of the conductor. When the customer opens the skin for processing, there will be rubber filaments remaining on the conductor. For soldering processing, by adjusting the angle of the inner die, the pressure of the rubber on the conductor is reduced, and the degree of the rubber being embedded in the gaps of the conductor is alleviated. By increasing the length of the inner die, part of the pressure of the rubber extruded from the head directly falling on the conductor will be decomposed. Moreover, since the length of the inner die is increased, the distance between the inner die and the outer die will be smaller, which will greatly reduce the pressure between the rubber and the conductor.

[0026] Furthermore, in this embodiment, an extension portion 23 is fixedly arranged in the connecting groove 22. The extension portion 23 abuts against the guiding part 2. The extension portion 23 is provided to guide the conductor to prevent the conductor from deforming and becoming blocked due to abutting against the guiding part 2 at the position of the connecting groove 22 and being unable to be smoothly led out.

[0027] Furthermore, in this embodiment, a wear-resistant sleeve 24 is provided inside the guiding portion 2. A guiding tube 25 that matches the guiding hole 3 is provided on one side of the wear-resistant sleeve 24. The provision of the wear-resistant sleeve 24 and the guiding tube 25 increases the strength of the guiding portion 2. When the wear-resistant sleeve is severely worn, the wear-resistant sleeve 24 can be removed and replaced, avoiding wear caused by overall replacement and also avoiding making the entire guiding portion 2 from wear-resistant materials, thereby reducing costs.

[0028] It should be noted that, in this embodiment, an installation groove is provided on one side of the guiding portion 2 close to the extension portion 23. An installation portion 26 that matches the installation groove is fixedly provided on the wear-resistant sleeve 24. By providing the installation portion 26, the wear-resistant sleeve 24 is prevented from separating and falling off from the guiding portion 2.

[0029] In addition, in some embodiments, internal threads are provided on the inner wall of the connecting sleeve 11 and the inner wall of the connecting groove 22, so as to be threadedly connected to the head of the extruder or the connecting portion 21. The inner die is connected to the head by rotating the connecting sleeve 11, and then the connecting portion 21 is threadedly connected to the plugging portion 1 to complete the installation.

[0030] More specifically, in some embodiments, grooves 4 are provided on both sides of the outer wall of the guiding portion 2. The two grooves 4 are arranged oppositely so that the guiding portion 2 can be clamped by a wrench. The opening of the wrench is inserted into the guiding portion 2, and by rotating the wrench, the guiding portion 2 can be driven to rotate to separate it from the plugging portion 1, thereby facilitating the removal of the wear-resistant sleeve 24 for replacement.

[0031] Working mode: During work, the inner die is connected to the head by rotating the connecting sleeve 11. The wear-resistant sleeve 24 is inserted into the guiding portion 2, and the installation portion 26 is aligned with the installation groove. Then the connecting portion 21 is threadedly connected to the plugging portion 1 to complete the installation. The opening of the wrench is inserted into the guiding portion 2, and by rotating the wrench, the guiding portion 2 can be driven to rotate to separate it from the plugging portion 1, thereby facilitating the removal of the wear-resistant sleeve 24 for replacement.

[0032] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A die head inner mold of a plastic extruder, comprising a plug-in part (1) connected to the die head and a guide part (2), characterized in that: A feeding channel is provided in the plug-in portion (1), the guide portion (2) is arranged on one side of the plug-in portion (1) and a guide hole (3) is provided on the guide portion (2); The plug-in part (1) is provided with a connecting sleeve (11), and the connecting sleeve (11) is detachably connected to the machine head; the guide part (2) is provided with a connecting portion (21); a connecting groove (22) is provided on a side of the plug-in part (1) close to the guide part (2); and the connecting portion (21) is detachably connected to the connecting groove (22).

2. The die head inner mold of a plastic extruder according to claim 1, characterized in that: An extension portion (23) is fixedly arranged in the connection groove (22), and the extension portion (23) abuts against the guide portion (2).

3. The die head inner mold of a plastic extruder according to claim 2, characterized in that: A wear-resistant sleeve (24) is arranged in the guide part (2), and a guide tube (25) matching with the guide hole (3) is arranged on one side of the wear-resistant sleeve (24).

4. The die head inner mold of a plastic extruder according to claim 3, characterized in that: A mounting groove is provided on one side of the guide portion (2) close to the extension portion (23), and a mounting portion (26) matching the mounting groove is fixedly provided on the wear-resistant sleeve (24).

5. The die head inner mold of a plastic extruder according to claim 1, characterized in that: The inner wall of the connecting sleeve (11) and the inner wall of the connecting groove (22) are both provided with internal threads, so as to be threadedly connected with the machine head or the connecting part (21).

6. The die head inner mold of a plastic extruder according to claim 5, characterized in that: Grooves (4) are provided on both sides of the outer wall of the guide part (2), and the two grooves (4) are arranged opposite to each other so that the guide part (2) can be clamped by a wrench.

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