Plastic extrusion die sleeve and medium voltage cable production device

Abstract

The utility model relates to the field of medium voltage cable production, especially a kind of plastic extrusion mould cover and medium voltage cable production device. Wherein a kind of plastic extrusion mould cover, including mould core (1), mould core (1) is equipped with mould cover base (2), and the inner side wall of mould cover base (2) and the outer side wall between mould core (1) form extrusion cavity (3);The one end of mould core (1) away from mould cover base (2) is detachably connected with main mould cover (4).The utility model uses modular design to make that mould cover base can be used with the main mould cover of multiple specifications, mould core, reduce the replacement frequency of mould, improve production efficiency.Meanwhile, the design that the mould cover base and main mould cover of the application are detachably connected also greatly reduces the work intensity of worker, has greater market promotion value.

Description

Technical Field

[0001] This utility model relates to the field of medium-voltage cable production, and in particular to a plastic extrusion die and a medium-voltage cable production device. Background Technology

[0002] In the production of medium-voltage cables, the sheath extrusion process is a crucial step in ensuring cable performance. Currently, the extruders commonly used for medium-voltage cable sheath extrusion are typically 150-type and 200-type plastic extruders. Different sizes of matching die cores are required during sheath extrusion. These two types of extruders generally have large dies made of #45 steel, resulting in significant weight. This makes die replacement time-consuming and labor-intensive, and requires continuous die changes when producing cables of various specifications.

[0003] Therefore, those skilled in the art are dedicated to developing a plastic extrusion die and a medium-voltage cable production device. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is to provide a plastic extrusion die and a medium-voltage cable production device.

[0005] To achieve the above objectives, this utility model provides a plastic extrusion mold sleeve, including a mold core, a mold sleeve base is provided outside the mold core, an extrusion cavity is formed between the inner side wall of the mold sleeve base and the outer side wall of the mold core; a main mold sleeve is detachably connected to the end of the mold sleeve base away from the mold core.

[0006] Preferably, the mold core includes a core body, the core body is conical and has a cable passage inside, and a shaping tube is provided at one end of the core body near the main mold sleeve, the shaping tube extending along the axial direction of the core body.

[0007] Preferably, the mold base is provided with a conical cavity that mates with the core.

[0008] Preferably, the radial cross-section of the extrusion cavity is annular, and its diameter decreases uniformly along the extrusion direction.

[0009] Preferably, the axes of the mold core, the mold base, and the main mold sleeve coincide.

[0010] Preferably, the distal end of the shaping tube is flush with the distal end of the main mold sleeve.

[0011] Preferably, a molding cavity is formed between the outer wall of the molding tube and the inner wall of the main mold sleeve.

[0012] Preferably, the inner cone angle α of the mold base is greater than the outer cone angle β of the core.

[0013] Preferably, the mold base has a clearance step at the end away from the mold core, the clearance step has an external thread, the main mold sleeve has an internal thread that mates with the external thread, and the main mold sleeve is threadedly connected to the mold base.

[0014] This utility model also provides a medium-voltage cable production device, including any of the plastic extrusion molds described above.

[0015] The beneficial effects of this utility model are as follows: The modular design allows the mold base to be used with various specifications of main mold sleeves and mold cores, reducing the frequency of mold replacement and improving production efficiency. Furthermore, the detachable connection between the mold base and the main mold sleeve greatly reduces the workload of workers and has significant market potential. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of a specific embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A magnified view of the local structure at point A in the middle.

[0018] Figure 3 This is a schematic cross-sectional view of the assembly of the mold base and the main mold in a specific embodiment of this utility model.

[0019] Figure 4 This is a cross-sectional structural diagram of the mold core in a specific embodiment of this utility model.

[0020] 1. Mold core; 11. Core body; 12. Shaping tube; 2. Mold sleeve base; 21. Relief step; 21a. External thread; 3. Extrusion cavity; 4. Main mold sleeve; 4a. Internal thread; 5. Shaping cavity; 6. Cable. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figure 1-4As shown, a plastic extrusion die includes a die core 1. Specifically, the die core 1 consists of a core body 11 and a shaping tube 12. The core body 11 is conical and has cable 6 passageways inside. Furthermore, the size of the cable 6 passageways inside each core body 11 is different, allowing selection of the appropriate core body 11 based on the diameter of the cable 6 to be laid. The shaping tube 12 is used in conjunction with the core body 11, and its overall shape is cylindrical, extending along the axial direction of the core body 11. In this embodiment, the core body 11 and the shaping tube 12 are manufactured using an integral molding technology to improve their structural strength. The combination design of the core body 11 and the shaping tube 12 restricts and guides the molten sheath material, enabling the molten material to be shaped according to the designed shape and size, ultimately forming a cable sheath that meets the requirements.

[0023] A die core 1 is fitted with a die sleeve base 2, one end of which is connected to the extruder head of an extruder (not shown in the figure). The die sleeve base 2 has a conical cavity that mates with the core 11. An extrusion cavity 3 is formed between the inner wall of the die sleeve base 2 and the outer wall of the die core 1. The radial cross-section of the extrusion cavity 3 is annular, and its diameter decreases uniformly along the extrusion direction. The extrusion cavity 3 provides a pathway for the molten material. Furthermore, the inner cone angle α of the die sleeve base 2 is always greater than the outer cone angle β of the core 11 to ensure the existence of the plastic extrusion cavity 3.

[0024] The main mold sleeve 4 is detachably connected to the end of the mold sleeve base 2 away from the mold core 1. In this embodiment, the main mold sleeve 4 is cylindrical and, like the core 11, has cable 6 passageways inside. The size of the cable 6 passageways inside each main mold sleeve 4 is different, and the corresponding main mold sleeve 4 can be selected according to the diameter of the cable 6 to be laid in actual use. Further, the detachable connection described in this embodiment is a threaded connection. Specifically, the end of the mold sleeve base 2 away from the mold core 1 is provided with a clearance step 21, and the clearance step 21 is provided with an external thread 21a. The main mold sleeve 4 is provided with an internal thread 4a that mates with the external thread 21a. The main mold sleeve 4 and the mold sleeve base 2 are connected through the internal and external threads 21a. In other embodiments, the detachable connection can also adopt other similar connection methods, such as magnetic connection, snap-fit ​​connection, pin connection, and key connection. The detachable connection design between the main mold sleeve 4 and the mold sleeve base 2 makes the replacement of the main mold sleeve 4 more convenient. Furthermore, the far end of the main mold sleeve 4 is flush with the far end of the forming tube 12, and a forming cavity 5 is formed between the inner wall of the main mold sleeve 4 and the outer wall of the forming tube 12. This structural design ensures the stability of the length and shape of the forming cavity 5, thereby ensuring that the extruded sheath has high dimensional accuracy and uniformity.

[0025] The core 1, the base 2, and the main die sleeve 4 are aligned to ensure extrusion accuracy. The base 2 can be used with multiple main die sleeves 4 and core 1 to improve its compatibility.

[0026] This utility model also provides a medium-voltage cable production device, including any of the plastic extrusion molds described above.

[0027] In use, firstly, select the corresponding main mold sleeve 4 and mold core 1 according to the diameter of the cable 6 to be laid. Then, install the mold core 1 and mold sleeve base 2 sequentially on the extruder head of the extruder. During installation, ensure that the inner cone angle α of the mold sleeve base 2 is always greater than the outer cone angle β of the core 11 to ensure the existence of the extrusion cavity 3. Finally, connect the main mold sleeve 4 to the mold sleeve base 2 via threads to complete the installation. This application adopts a modular design, which allows the mold sleeve base 2 to be used with main mold sleeves 4 and mold cores 1 of various specifications, reducing the frequency of mold replacement and improving production efficiency. At the same time, the detachable connection design of the mold sleeve base 2 and main mold sleeve 4 in this application also greatly reduces the labor intensity of workers and has significant market promotion value. The preferred embodiment of this utility model has been described in detail above.

[0028] It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A plastic extrusion die sleeve, characterized in that: Includes a mold core (1), and a mold base (2) is provided on the outer sleeve of the mold core (1). An extrusion cavity (3) is formed between the inner side wall of the mold base (2) and the outer side wall of the mold core (1). A main mold sleeve (4) is detachably connected to the end of the mold base (2) away from the mold core (1).

2. The plastic extrusion die sleeve as described in claim 1, characterized in that: The mold core (1) includes a core body (11), which is conical and has a cable passage inside. A plastic tube (12) is provided at one end of the core body (11) near the main mold sleeve (4), and the plastic tube (12) extends axially along the core body (11).

3. The plastic extrusion die sleeve as described in claim 2, characterized in that: The mold base (2) is provided with a conical cavity that cooperates with the core (11).

4. The plastic extrusion die sleeve as described in claim 1, characterized in that: The radial cross-section of the extrusion cavity (3) is annular, and its diameter decreases uniformly along the extrusion direction.

5. The plastic extrusion die sleeve as described in claim 1, characterized in that: The core (1), the base (2), and the main mold sleeve (4) have their axes aligned.

6. The plastic extrusion die sleeve as described in claim 2, characterized in that: The distal end of the shaping tube (12) is flush with the distal end of the main mold sleeve (4).

7. The plastic extrusion die sleeve as described in claim 6, characterized in that: A molding cavity (5) is formed between the outer wall of the molding tube (12) and the inner wall of the main mold sleeve (4).

8. The plastic extrusion die sleeve as described in claim 7, characterized in that: The inner cone angle α of the mold base (2) is greater than the outer cone angle β of the core (11).

9. The plastic extrusion die sleeve as described in claim 1, characterized in that: The mold base (2) has a clearance step (21) at one end away from the mold core (1). The clearance step (21) has an external thread (21a). The main mold sleeve (4) has an internal thread (4a) that matches the external thread (21a). The main mold sleeve (4) is threadedly connected to the mold base (2).

10. A medium-voltage cable production apparatus, characterized in that: Includes the plastic extrusion die as described in any one of claims 1-9.

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