Extrusion die for low-smoke halogen-free flame-retardant sheath
By designing a low smoke halogen-free flame-retardant sheath extrusion die including a die sleeve extrusion body, an extruded line bearing diameter sizing ring and a sizing ring gland, the existing molds have solved the problems of low glue output, slow production efficiency and uneven sheath surface, and the effect of improving production efficiency and surface quality is achieved.
Patent Information
- Application Number
- CN202421841745.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-20
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing low-smoke, halogen-free flame retardant sheath extrusion molds do not fully consider the special properties of low-smoke, halogen-free flame retardant materials in their design, resulting in low glue output and slow production efficiency. After increasing the screw speed, the surface of the sheath is prone to numbness and unevenness.
A low-smoke, halogen-free flame-retardant sheath extrusion die is designed, including a die sleeve extrusion body, an extruded bearing diameter sizing ring and a sizing ring pressure gland. The inner wall of the die sleeve extrusion body is equipped with a nanocoated layer. The flow channel is composed of the inner cavity of the die sleeve extrusion body and the inner cavity of the extruded bearing diameter sizing ring. The sizing ring pressure gland is used to limit the fixed extruded bearing diameter sizing ring.
Through this mold design, the sheath extrusion production efficiency and surface quality are improved, the screw speed can be increased by nearly 33%, the main engine current and extrusion pressure are more stable, and the sheath surface is smooth.
Smart Images
Figure CN222886210U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technology of mold design and manufacturing, and particularly relates to a low-smoke and halogen-free flame-retardant sheath extrusion mold. Background Technique
[0002] The low-smoke and halogen-free flame-retardant material is an environment-friendly material that does not produce toxic smoke and hydrogen halide gas during the combustion process and has remarkable flame-retardant performance. It does not contain halogens (F, Cl, Br, I, At) and harmful environmental substances such as lead, cadmium, chromium, and mercury. Therefore, it can reduce the harm to the environment and human health during combustion. This material has been widely used in many fields such as wire and cable, building decoration, transportation, and electronic and electrical appliances. In the field of wire and cable, the low-smoke and halogen-free flame-retardant material is used to make the insulation layer and sheath layer to improve the safety and service life of the cable. Especially in places with high fire risks such as high-rise buildings, subways, and nuclear power plants, its application is particularly important. In building decoration, this material can be used for carpets, wallpapers, partition boards, etc. to reduce fire hazards. In the transportation field, it is used for the interior decoration and components of vehicles such as cars and trains to improve traffic safety. In addition, due to its excellent flame-retardant performance and environmental protection characteristics, the low-smoke and halogen-free flame-retardant material is also widely used in electronic and electrical products.
[0003] At present, when cable manufacturers produce low-smoke and halogen-free flame-retardant outer sheaths, they generally use ordinary extrusion molds. These molds are not fully designed to consider the special properties of low-smoke and halogen-free flame-retardant materials, such as the poor melt fluidity and large extrusion pressure caused by high filling amounts of inorganic materials (such as aluminum hydroxide, magnesium hydroxide, etc.). Therefore, in actual production, these molds often have problems such as low glue output and slow production efficiency. In addition, when the screw speed is increased to pursue higher production efficiency, the surface of the sheath is prone to numbness and unevenness, which will have an adverse impact on its electrical performance, mechanical performance, and flame-retardant performance. Content of the Utility Model
[0004] To solve the problems existing in the prior art, the utility model provides a low-smoke and halogen-free flame-retardant sheath extrusion mold to achieve the improvement of the sheath extrusion production efficiency and the sheath surface quality.
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] The utility model provides a low-smoke and halogen-free flame-retardant sheath extrusion die, which is characterized in that it includes a die sleeve extrusion main body, an extrusion wire-bearing diameter sizing ring and a sizing ring gland; the extrusion wire-bearing diameter sizing ring is sleeved inside the die sleeve extrusion main body; the sizing ring gland is connected to the end of the die sleeve extrusion main body and is used to limit the extrusion wire-bearing diameter sizing ring; a nano-coating is arranged on the inner wall of the die sleeve extrusion main body; the inner cavity of the die sleeve extrusion main body and the inner cavity of the extrusion wire-bearing diameter sizing ring together form a flow channel.
[0007] Preferably, a plurality of fixing screw holes are arranged at one end of the die sleeve extrusion main body; a plurality of through holes are arranged on the sizing ring gland; the number and positions of the fixing screw holes correspond to those of the through holes; the fixing screw holes and the through holes are connected by gland fixing screws.
[0008] Preferably, the die sleeve extrusion main body is made of tungsten steel.
[0009] Preferably, the nano-coating is made of high-crystalline nano-coating material.
[0010] Preferably, the sizing ring gland is made of alloy structural steel.
[0011] Preferably, the inner cavity of the die sleeve extrusion main body includes a cylindrical inner cavity and a frustum-shaped inner cavity; the cylindrical inner cavity is communicated with the end of the frustum-shaped inner cavity.
[0012] Preferably, the cylindrical inner cavity is used to place the extrusion wire-bearing diameter sizing ring.
[0013] Preferably, the inner cavity of the extrusion wire-bearing diameter sizing ring is frustum-shaped.
[0014] Preferably, the inner cone angle of the die sleeve extrusion main body is the first inner cone angle; the inner cone angle of the extrusion wire-bearing diameter sizing ring is the second inner cone angle; the first inner cone angle and the second inner cone angle are equal.
[0015] Preferably, the inner cone angle of the die sleeve extrusion main body is the first inner cone angle; the inner cone angle of the extrusion wire-bearing diameter sizing ring is the second inner cone angle; the first inner cone angle and the second inner cone angle are not equal.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] The flow channel formed by the inner cavity of the extrusion main body of the mold sleeve of the present utility model and the inner cavity of the sizing ring for the extrusion bearing wire diameter facilitates the flow and extrusion of low-smoke and halogen-free flame-retardant materials. By connecting the sizing ring gland to the extrusion main body of the mold sleeve, the sizing ring for the extrusion bearing wire diameter can be conveniently fixed to prevent it from moving or deforming during the extrusion process, simplifying the mold installation steps and improving production efficiency. The inner wall of the extrusion main body of the mold sleeve is provided with a nano-coating, which improves the temperature resistance. Compared with traditional ordinary molds, the screw speed can be increased by nearly 33%, the main machine current and extrusion pressure are more stable, and the surface of the sheath is smooth.
[0018] Furthermore, the extrusion main body of the mold sleeve, the sizing ring for the extrusion bearing wire diameter, and the sizing ring gland are respectively made of materials such as tungsten steel, high-crystalline nano-coating, and alloy structural steel, which have excellent properties such as high strength, high hardness, wear resistance, and corrosion resistance. This not only extends the service life of the mold but also improves the quality and stability of the extruded products. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present utility model in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic for facilitating the understanding of the present utility model and do not specifically limit the shapes and proportional dimensions of the components of the present utility model.
[0020] In the drawings:
[0021] Figure 1 is a schematic structural view of a low-smoke and halogen-free flame-retardant sheath extrusion mold of the present utility model;
[0022] Figure 2 is a side view of the extrusion mold sleeve main body;
[0023] Figure 3 is a side view of the sizing ring for the extrusion bearing wire diameter;
[0024] In the figure, 1 - extrusion mold sleeve main body; 11 - fixing screw hole; α - first inner cone angle; 2 - sizing ring for the extrusion bearing wire diameter; β - first inner cone angle; 3 - sizing ring gland; 31 - screw fixing through hole; 4 - gland fixing screw. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] In order to enable those skilled in the art of the present technology to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0026] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.
[0027] The present utility model provides a low-smoke and halogen-free flame-retardant sheath extrusion die, and the die sleeve is of a split type. As Figure 1 shown, it specifically includes a die sleeve extrusion main body 1, an extrusion wire-bearing diameter sizing ring 2 and a sizing ring gland 3; the extrusion wire-bearing diameter sizing ring 2 is sleeved inside the die sleeve extrusion main body 1; the sizing ring gland 3 is connected to the end of the die sleeve extrusion main body 1 and is used to limit the extrusion wire-bearing diameter sizing ring 2; a nano-coating is provided on the inner wall of the die sleeve extrusion main body 1; the inner cavity of the die sleeve extrusion main body 1 and the inner cavity of the extrusion wire-bearing diameter sizing ring 2 together form a flow channel. The die sleeve extrusion main body 1, as the main part of the die, provides basic structural support and positioning for the extrusion process. The extrusion wire-bearing diameter sizing ring 2 is sleeved inside the die sleeve extrusion main body 1 and is used to precisely control the wire diameter and shape of the extruded sheath. The sizing ring gland 3 is used to limit the extrusion wire-bearing diameter sizing ring 2 to prevent it from moving or deforming during the extrusion process. The flow channel is jointly formed by the inner cavity of the die sleeve extrusion main body 1 and the inner cavity of the extrusion wire-bearing diameter sizing ring 2 and can guide the flow of the sheath material: the flow channel enables the low-smoke and halogen-free flame-retardant sheath material to be smoothly extruded, avoiding the accumulation or blockage of the material in the die. A nano-coating is provided on the inner wall of the die sleeve extrusion main body 1, and the presence of the nano-coating improves the temperature resistance. Compared with traditional ordinary dies, the screw speed can be increased by nearly 33%, the main machine current and extrusion pressure are more stable, and the surface of the sheath is smooth.
[0028] A number of fixing screw holes 11 are provided at one end of the die sleeve extrusion main body 1; a number of through holes 31 are provided on the sizing ring gland 3; the number and positions of the fixing screw holes 11 correspond to those of the through holes 31; the fixing screw holes 11 and the through holes 31 are connected by gland fixing screws 4. The fixing screw holes 11 are located at one end of the die sleeve extrusion main body. By installing the gland fixing screws 4 in these fixing screw holes 11, it can be ensured that the sizing ring gland 3 is firmly fixed on the die sleeve extrusion main body, thereby preventing the extrusion wire-bearing diameter sizing ring 2 from moving or falling off during the extrusion process. Since the structure between the die sleeve extrusion main body 1 and the sizing ring gland 3 is detachable, removing the gland fixing screws 4 can realize the disassembly of the die sleeve extrusion main body 1 and the sizing ring gland 3. At the same time, when replacing the die with adjacent specifications, only the extrusion wire-bearing diameter sizing ring 2 needs to be replaced, and there is no need for overall disassembly.
[0029] The die sleeve extrusion body 1 is made of tungsten steel, which is a high-hardness and high-strength alloy material mainly composed of tungsten and other alloy elements (such as nickel, molybdenum, chromium, cobalt, etc.). Its hardness is significantly higher than that of ordinary steel. Therefore, using tungsten steel for the die sleeve extrusion body can ensure that it remains sharp and precise during the extrusion process for a long time, reduce wear and deformation, and improve the service life of the die; at the same time, tungsten steel has good heat resistance and can maintain its hardness and rigidity in a high-temperature environment, not easily softening or deforming, which can ensure the stability and reliability of the die during the high-temperature extrusion process; tungsten steel also has good corrosion resistance and can resist the erosion of corrosive media such as acids and alkalis, which helps to extend the service life of the die.
[0030] The wire diameter sizing ring 2 is coated with a nano-coating, preferably made of a high-crystalline nano-coating material. The high-crystalline nano-coating material has characteristics such as high strength, high hardness, and high wear resistance. This coating can significantly improve the surface hardness and wear resistance of the wire diameter sizing ring, reduce friction and wear with the sheath material during the extrusion process, thereby extending the service life of the die; the nano-coating material also has a self-cleaning function, which can reduce the accumulation of dirt and impurities on the die surface, keeping the die clean and precise; the high-crystalline nano-coating also has certain anti-corrosion properties, which can further improve the durability of the wire diameter sizing ring in a harsh working environment.
[0031] When the wire diameter sizing ring 2 is made of a high-crystalline nano-coating material compared with traditional ordinary dies, using the same flame-retardant material, during the extrusion production with the same extruder, the temperature resistance performance of the extrusion die is better, it is not easy to overheat, the extrusion effect is better, and the efficiency is faster, as shown in Table 1:
[0032] Table 1 Performance comparison between ordinary dies and the dies of this application
[0033]
[0034] The sizing ring gland 3 is made of alloy structural steel, such as 38CrMoAL, etc. Alloy structural steel has relatively high strength and toughness and can withstand large pressures and impacts. Using alloy structural steel for the sizing ring gland can ensure that it is not easily deformed or broken during the fastening process, maintaining the stability and reliability of the die structure; alloy structural steel also has good wear resistance and corrosion resistance and can maintain its surface finish and precision during long-term use. This helps to reduce the friction and wear between the sizing ring gland and the die sleeve extrusion body, and at the same time prevent the erosion of corrosive media on the die.
[0035] Such as Figure 2 And Figure 3As shown, the inner cavity of the die sleeve extrusion body 1 includes a cylindrical inner cavity and a frustum-shaped inner cavity; the cylindrical inner cavity communicates with the end of the frustum-shaped inner cavity; the cylindrical inner cavity is used to place the extrusion wire diameter sizing ring 2. The inner cavity of the extrusion wire diameter sizing ring 2 is frustum-shaped. The inner cone angle of the die sleeve extrusion body 1 is the first inner cone angle α; the inner cone angle of the extrusion wire diameter sizing ring 2 is the second inner cone angle β; the first inner cone angle α and the second inner cone angle β can be equal or not equal; when the first inner cone angle α and the second inner cone angle β are equal, the extrusion production proceeds normally; when the first inner cone angle α and the second inner cone angle β are not equal, for semi-finished products with an outer diameter deviation within 5 mm, the first inner cone angle α can deviate from the second inner cone angle β, and it does not affect the extrusion production either.
[0036] For the semi-finished products with an outer diameter within 5 mm before extrusion, the present utility model only needs to replace the extrusion wire diameter sizing ring 2, without the need for overall disassembly, shortening the die change time and improving the extrusion production efficiency; and adopting a split design, the inner wall of the die has stronger heat resistance and a smoother surface due to the use of tungsten steel and high-crystalline nano-coating materials, and the extrusion efficiency and the surface of the sheath extrusion are better.
[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
Claims
1. A low smoke halogen-free flame retardant sheath extrusion die, characterized in that: The invention comprises a die sleeve extrusion body (1), an extrusion wire sizing ring (2) and a sizing ring pressure cover (3); the extrusion wire sizing ring (2) is sleeved in the die sleeve extrusion body (1); the sizing ring pressure cover (3) is connected to the end of the die sleeve extrusion body (1) and is used to limit the extrusion wire sizing ring (2); the inner wall of the die sleeve extrusion body (1) is provided with a nano coating; the inner cavity of the die sleeve extrusion body (1) and the inner cavity of the extrusion wire sizing ring (2) together form a flow channel.
2. A low-smoke, halogen-free, flame-retardant sheath extrusion die according to claim 1, characterized in that: A plurality of fixing screw holes (11) are arranged at one end of the die sleeve extrusion body (1); a plurality of through holes (31) are arranged on the sizing ring pressure cover (3); the number and positions of the fixing screw holes (11) correspond to those of the through holes (31); the fixing screw holes (11) and the through holes (31) are connected via pressure cover fixing screws (4).
3. The low-smoke halogen-free flame-retardant sheath extrusion die according to claim 1, characterized in that: The die sleeve extrusion body (1) is made of tungsten steel.
4. The low-smoke halogen-free flame-retardant sheath extrusion die according to claim 1, characterized in that: The nano coating is made of high-crystalline nano coating material.
5. The low-smoke zero-halogen flame-retardant sheath extrusion die according to claim 1, characterized in that: The sizing ring gland (3) is made of alloy structural steel.
6. The low-smoke zero-halogen flame-retardant sheath extrusion die according to claim 1, characterized in that: The inner cavity of the die sleeve extrusion body (1) comprises a cylindrical inner cavity and a truncated cone inner cavity; the cylindrical inner cavity is connected to the end of the truncated cone inner cavity.
7. The low-smoke zero-halogen flame-retardant sheath extrusion die according to claim 6, characterized in that: The cylindrical inner cavity is used for placing an extruded wire diameter sizing ring (2).
8. The low-smoke zero-halogen flame-retardant sheath extrusion die according to claim 1, characterized in that: The inner cavity of the extruded wire-bearing sizing ring (2) is in the shape of a truncated cone.
9. The low-smoke zero-halogen flame-retardant sheath extrusion die according to claim 1, characterized in that: The inner cone angle of the die sleeve extrusion body (1) is a first inner cone angle α; the inner cone angle of the extrusion wire diameter sizing ring (2) is a second inner cone angle β; the first inner cone angle α and the second inner cone angle β are equal.
10. The low-smoke zero-halogen flame-retardant sheath extrusion die according to claim 1, characterized in that: The inner cone angle of the die sleeve extrusion body (1) is a first inner cone angle α; the inner cone angle of the extrusion wire diameter sizing ring (2) is a second inner cone angle β; the first inner cone angle α and the second inner cone angle β are not equal.