Cable sheath extruder die head

Abstract

This invention discloses a cable sheath extruder head, comprising: a first housing; a second housing; a distributor disposed inside the first housing; a die core connected to the other end of the distributor; a die sleeve seat disposed at the other end of the first housing; a first pressure cap fitted over the portion of the die sleeve seat located outside the first housing and connected to the other end of the first housing; a second pressure cap connected to the end of the die sleeve seat away from the first housing; a die sleeve disposed inside the die sleeve seat and connected to the second pressure cap, the die sleeve and the die core being spaced apart to form a discharge channel; and a plurality of adjusting screws spaced apart around the circumference of the first pressure cap, the adjusting screws passing through the first pressure cap and abutting against the die sleeve seat, the eccentricity of the die sleeve seat being adjusted by adjusting the adjusting screws. With this cable sheath extruder head, when replacing the die core and die sleeve, there is no need to repeatedly adjust the eccentricity, thus the disassembly and assembly process is simple, fast, and controllable, improving disassembly and assembly efficiency.

Description

Technical Field

[0001] This invention belongs to the field of cable production technology, and specifically relates to a die head for a cable sheath extruder. Background Technology

[0002] Existing cable sheathing extruder heads require readjustment of the eccentricity when changing the die core and sleeve, which is time-consuming and labor-intensive. Furthermore, to ensure passing the bundled combustion test, it is essential to select a high-flame-retardant, low-smoke, halogen-free flame-retardant sheathing material. However, after enhancing the flame retardancy of the low-smoke, halogen-free sheathing material, its extrusion performance deteriorates. Moreover, existing cable sheathing extruder heads experience low extrusion efficiency or equipment tripping issues when extrudeing high-flame-retardant sheaths. Summary of the Invention

[0003] This invention provides a cable sheath extruder head to solve the aforementioned technical problems, specifically adopting the following technical solution:

[0004] A cable sheath extruder head, comprising:

[0005] The first housing is cylindrical, and a feed inlet is provided on the side of the first housing;

[0006] The second housing is arranged perpendicular to the first housing, and one end of the second housing is connected to the feed port of the ground housing;

[0007] A feeder is disposed inside the first housing, the first housing is sleeved on the feeder, one end of the feeder is connected to one end of the first housing, and a gap is formed between the first housing and the feeder.

[0008] The mold core is connected to the other end of the distributor;

[0009] A mold base is disposed at the other end of the first housing, and at least partially disposed outside the first housing;

[0010] A first pressure cap is fitted onto the portion of the mold base located outside the first housing and connected to the other end of the first housing. The first pressure cap is fixed to the first housing by a clamping screw.

[0011] The second pressure cover is connected to the end of the mold sleeve base away from the first housing. The second pressure cover is threadedly engaged with the mold sleeve base. The distance between the second pressure cover and the mold core can be adjusted by rotating the second pressure cover.

[0012] A mold sleeve is disposed within the mold sleeve base and connected to the second pressure cover. The mold sleeve and the mold core are spaced a certain distance apart to form a discharge channel. The mold sleeve moves closer to or further away from the mold core along with the second pressure cover, thereby adjusting the width of the discharge channel.

[0013] A plurality of adjusting screws are spaced apart around the first pressure plate. The adjusting screws pass through the first pressure plate and abut against the mold sleeve seat. The degree of eccentricity of the mold sleeve seat is adjusted by adjusting the adjusting screws.

[0014] Furthermore, the cable sheath extruder head also includes:

[0015] A screw is disposed at the other end of the second housing. The screw rotates under the drive of a drive motor to convey the sheathing material to the other end of the second housing.

[0016] The screw includes a splined connection part, a main body part, a first threaded section, a second threaded section, and a third threaded end;

[0017] The thread groove depth of the first threaded segment is greater than the thread groove depth of the second threaded segment;

[0018] The groove depth of the second threaded segment is greater than the groove depth of the third threaded segment.

[0019] Furthermore, the groove depth of the third thread segment first gradually increases and then gradually decreases in its extension direction.

[0020] Furthermore, the thread groove depth of the first thread segment is greater than or equal to 11 and less than or equal to 13.

[0021] The groove depth of the second threaded section is greater than or equal to 9 and less than or equal to 10.

[0022] The groove depth of the third threaded section is greater than or equal to 7 and less than or equal to 9.

[0023] Furthermore, the cable sheath extruder head also includes:

[0024] A first heating sleeve is fitted onto the first housing, and a first temperature sensor for detecting the temperature of the first heating sleeve is provided inside the first heating sleeve.

[0025] The second heating jacket is fitted onto the second housing, and a second temperature sensor is provided inside the second heating jacket for detecting the temperature of the second heating jacket;

[0026] The controller is connected to the first heating jacket, the first temperature sensor, the second heating jacket, and the second temperature sensor;

[0027] The configuration module is used to configure the parameter attributes of the sheath material;

[0028] The controller controls the predetermined heating temperature of the first heating jacket and the second heating jacket according to the parameters of the configuration module.

[0029] Furthermore, the cable sheath extruder head also includes:

[0030] A current detection module is connected to the drive motor that drives the screw and is used to detect the operating current of the drive motor. The controller is connected to the current detection module and dynamically corrects the predetermined heating temperature of the first heating jacket and the second heating jacket based on the operating current detected by the current detection module.

[0031] Furthermore, when the current detection module detects that the operating current of the drive motor is greater than the normal operating current for a predetermined time, the controller increases the predetermined heating temperature of the first heating jacket and the second heating jacket by a preset value.

[0032] Furthermore, the die head of the cable sheath extruder is used to extrude a high flame-retardant, low-smoke, halogen-free sheath.

[0033] Furthermore, when the core is an extrusion core, the aperture of the core is 0.4-1mm larger than the outer diameter of the cable core before sheath extrusion, and the aperture of the sleeve is 0.3-0.6mm larger than the outer diameter of the finished product after sheath extrusion.

[0034] Furthermore, when the die core is an extrusion tube die core, the aperture of the die core is 1-2 mm larger than the outer diameter of the cable core before sheath extrusion, and the aperture of the die sleeve is 1.5-2 times larger than the outer diameter of the finished product after sheath extrusion by the thickness of the extruded plastic layer.

[0035] The advantage of this invention is that the provided cable sheath extruder head does not require repeated eccentric adjustment when changing the die core and die sleeve, thus the disassembly and assembly process is simple, fast, and controllable, improving the efficiency of disassembly and assembly.

[0036] The advantage of this invention is that the provided cable sheath extruder head, through the optimization of the structure of the screw and the die core and sleeve, solves the problem of low extrusion efficiency or equipment tripping when extruding high flame retardant sheaths. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the die head of the cable sheath extruder of this application;

[0039] Figure 2 This is a schematic diagram of the screw in this application;

[0040] First housing 10, feed inlet 101, second housing 11, distributor 12, mold core 13, mold sleeve base 14, first pressure cover 15, second pressure cover 16, mold sleeve 17, adjusting screw 18, clamping screw 19, discharge channel 20, screw 21, spline connection 211, main body 212, first threaded section 213, second threaded section 214, third threaded end 215, first heating sleeve 22, second heating sleeve 23. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] like Figure 1 and 2 The image shows a cable sheath extruder head, comprising: a first housing 10, a second housing 11, a feeder 12, a die core 13, a die sleeve base 14, a first pressure plate 15, a second pressure plate 16, a die sleeve 17, and several adjusting screws 18.

[0045] The first housing 10 is cylindrical, and a feed inlet 101 is provided on its side. The second housing 11 is arranged perpendicularly to the first housing 10, with one end of the second housing 11 connected to the feed inlet 101 of the first housing. A distributor 12 is disposed inside the first housing 10. The first housing 10 is fitted onto the distributor 12, with one end of the distributor 12 connected to one end of the first housing 10, forming a gap between the first housing 10 and the distributor 12. A mold core 13 is connected to the other end of the distributor 12. Specifically, the mold core 13 and the distributor 12 can be fitted together by a threaded connection. A mold sleeve 14 is disposed at the other end of the first housing 10, and at least partially disposed outside the first housing 10. A first pressure cap 15 is fitted onto the portion of the mold sleeve 14 located outside the first housing 10 and connected to the other end of the first housing 10. Specifically, the first pressure cap 15 is fixed to the first housing 10 by a clamping screw 19. The second pressure cap 16 is connected to the end of the mold sleeve base 14 furthest from the first housing 10. The second pressure cap 16 is threaded into the mold sleeve base 14, and the distance between the second pressure cap 16 and the mold core 13 can be adjusted by rotating the second pressure cap 16. The mold sleeve 17 is disposed inside the mold sleeve base 14 and connected to the second pressure cap 16. The mold sleeve 17 and the mold core 13 are spaced apart to form a discharge channel 20. The mold sleeve 17 moves closer to or further away from the mold core 13 along with the second pressure cap 16, thereby adjusting the width of the discharge channel 20. A plurality of adjusting screws 18 are spaced apart around the first pressure cap 15. The adjusting screws 18 pass through the first pressure cap 15 and abut against the mold sleeve base 14. The degree of eccentricity of the mold sleeve base 14 can be adjusted by adjusting the adjusting screws 18.

[0046] In this application, the die head of the cable sheath extruder has an adjusting screw 18 fixed to the die holder 14. When adjusting the die, the operator adjusts the die holder 14 to the center, achieving the lowest possible eccentricity. When replacing the die core 13 and die holder 17, it is unnecessary to move the adjusting screw 18 and clamping screw 19 on the first pressure plate 15, as the die holder 14 is already centered, eliminating the need for further eccentricity adjustment. It is understandable that concentricity is required to ensure the die core 13 and die holder 17 are concentric after installation. During the replacement of the die core 13 and die holder 17, only the second pressure plate 16 needs to be removed, the die holder 17 pushed out, and the die core 13 removed using an insert wrench. Similarly, the die core 13, die holder 17, and second pressure plate 16 are installed sequentially. This process does not require moving the first pressure plate 15 or the adjusting screw 18 that presses against the die holder 14. Eccentricity adjustment is optional, or it can be fine-tuned. The disassembly and assembly process is simple, quick, and controllable, thus improving efficiency.

[0047] In an embodiment of this application, the cable sheath extruder head further includes a screw 21. The screw 21 is disposed at the other end of the second housing 11, and the screw 21 rotates under the drive of a drive motor to convey the sheath material to the other end of the second housing 11.

[0048] In the embodiments of this application, the die head of the cable sheath extruder is used to extrude a high flame-retardant, low-smoke, halogen-free sheath. To ensure the low-smoke, halogen-free cable passes the bundled combustion test, it is essential to select a high flame-retardant, low-smoke, halogen-free flame-retardant sheath material. However, after the flame retardancy of the low-smoke, halogen-free sheath material is enhanced, its extrusion performance deteriorates. In the cable industry, low extrusion efficiency or equipment tripping occurs during the extrusion of high flame-retardant sheaths. In this application, to improve such problems, the screw 21 is modified. For example... Figure 2 As shown, the screw 21 includes a spline connection portion 211, a main body portion 212, a first threaded section 213, a second threaded section 214, and a third threaded end 215. The third threaded end 215 is located near the other end of the second housing 11. The thread groove depth of the first threaded section 213 is greater than the thread groove depth of the second threaded section 214. The thread groove depth of the second threaded section 214 is greater than the thread groove depth of the third threaded section. Preferably, the thread groove depth of the first threaded section 213 is greater than or equal to 11 mm and less than or equal to 13 mm. The thread groove depth of the second threaded section 214 is greater than or equal to 9 mm and less than or equal to 10 mm. The thread groove depth of the third threaded section is greater than or equal to 7 mm and less than or equal to 9 mm.

[0049] In the embodiments of this application, the groove depth of the third thread segment first gradually increases and then gradually decreases in its extension direction.

[0050] Specifically, in this application, the thread groove depth of the first threaded section 213 is 12.37 mm. The thread groove depth of the second threaded section 214 is 9.65 mm. The thread groove depth of the third threaded section gradually increases from 7.64 mm to 8.5 mm, and then gradually decreases to 7.95 mm.

[0051] Similarly, to address the issues of low extrusion efficiency or equipment tripping during high flame-retardant sheath extrusion in the cable industry, the structures of the die core 13 and die sleeve 17 are optimized. Specifically, in the embodiments of this application, when the die core 13 is an extrusion die core 13, the aperture of the die core 13 is 0.4-1mm larger than the outer diameter of the cable core before sheath extrusion, and the aperture of the die sleeve 17 is 0.3-0.6mm larger than the outer diameter of the finished product after sheath extrusion. For example, if the outer diameter of the cable core before sheath extrusion is 20mm, the aperture of the die core 13 is 21mm. If the outer diameter of the cable core before sheath extrusion is 20.7mm, the aperture of the die core 13 is 22mm.

[0052] In the embodiments of this application, when the core 13 is an extrusion tube type core 13, the aperture of the core 13 is 1-2 mm larger than the outer diameter of the cable core before sheath extrusion, and the aperture of the sleeve 17 is 1.5-2 times larger than the outer diameter of the finished product after sheath extrusion, which is the thickness of the extruded plastic layer.

[0053] In an embodiment of this application, the cable sheath extruder head further includes: a first heating jacket 22, a second heating jacket 23, a controller, and a configuration module. The first heating jacket 22 is fitted onto the first housing 10 to heat the first housing 10. A first temperature sensor (not shown) is provided inside the first heating jacket 22 to detect its temperature. Multiple first temperature sensors can be used, and the average temperature of the multiple sensors is used as the detection temperature. The second heating jacket 23 is fitted onto the second housing 11 to heat the second housing 11. A second temperature sensor is provided inside the second heating jacket 23 to detect its temperature. The controller is connected to the first heating jacket 22, the first temperature sensor, the second heating jacket 23, and the second temperature sensor. The configuration module is used to configure the parameter properties of the sheath material. The controller controls the predetermined heating temperatures of the first heating jacket 22 and the second heating jacket 23 according to the parameters configured in the configuration module.

[0054] It is understood that the first heating jacket 22 and the second heating jacket 23 are used to heat the die head, keeping the material inside the die head in a molten state for easy extrusion. Different materials exhibit different characteristics, and correspondingly, require different heating temperatures. In this application, to ensure that the heating temperatures of the first heating jacket 22 and the second heating jacket 23 better match the material characteristics, the operator pre-configures the parameters of the jacket material in the configuration module according to the material to be extruded. It is understood that these parameters can be the heating level corresponding to the material. After the heating level is set, the controller controls the first heating jacket 22 and the second heating jacket 23 to adjust their heating temperatures to the predetermined heating temperature corresponding to the heating level.

[0055] In an embodiment of this application, the die head of the cable sheath extruder further includes a current detection module.

[0056] A current detection module is connected to the drive motor of the drive screw 21 to detect the operating current of the drive motor. A controller is connected to the current detection module and dynamically corrects the predetermined heating temperatures of the first heating jacket 22 and the second heating jacket 23 based on the operating current detected by the current detection module. Specifically, in the embodiments of this application, when the current detection module detects that the operating current of the drive motor is greater than the normal operating current for a predetermined period of time, the controller increases the predetermined heating temperatures of the first heating jacket 22 and the second heating jacket 23 by a preset value.

[0057] The heating level configured by the operator through the configuration module is designed according to the properties of the sheath material. However, during the early stages of production, slight changes in the formulation or mixing parameters, as well as differences in the current working environment of the extruder, may cause the heating level configured through the configuration module to not perfectly match the optimal preset heating temperature. Understandably, when the heating temperatures of the first heating jacket 22 and the second heating jacket 23 are not up to standard, the material becomes more difficult to extrude, and correspondingly, driving the screw 21 by the drive motor becomes more difficult. This is reflected in the drive motor's operating current, which is actually higher than the normal current. Therefore, based on the drive motor's current performance, it is possible to help determine whether the heating temperatures of the first heating jacket 22 and the second heating jacket 23 are appropriate. When the heating temperature is inappropriate, the target heating temperature is adjusted accordingly.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A cable sheath extruder head, characterized in that, Include: The first housing is cylindrical, and a feed inlet is provided on the side of the first housing; The second housing is arranged perpendicular to the first housing, and one end of the second housing is connected to the feed port of the first housing; A feeder is disposed inside the first housing, the first housing is sleeved on the feeder, one end of the feeder is connected to one end of the first housing, and a gap is formed between the first housing and the feeder. The mold core is connected to the other end of the distributor; A mold base is disposed at the other end of the first housing, and at least partially disposed outside the first housing; A first pressure cap is fitted onto the portion of the mold base located outside the first housing and connected to the other end of the first housing. The first pressure cap is fixed to the first housing by a clamping screw. The second pressure cover is connected to the end of the mold sleeve base away from the first housing. The second pressure cover is threadedly engaged with the mold sleeve base. The distance between the second pressure cover and the mold core can be adjusted by rotating the second pressure cover. A mold sleeve is disposed within the mold sleeve base and connected to the second pressure cover. The mold sleeve and the mold core are spaced a certain distance apart to form a discharge channel. The mold sleeve moves closer to or further away from the mold core along with the second pressure cover, thereby adjusting the width of the discharge channel. A plurality of adjusting screws are spaced apart around the first pressure plate. The adjusting screws pass through the first pressure plate and abut against the mold sleeve seat. The degree of eccentricity of the mold sleeve seat is adjusted by adjusting the adjusting screws. The cable sheath extruder head also includes: A screw is disposed at the other end of the second housing. The screw rotates under the drive of a drive motor to convey the sheathing material to the other end of the second housing. The screw includes a splined connection part, a main body part, a first threaded section, a second threaded section, and a third threaded end; The thread groove depth of the first threaded segment is greater than the thread groove depth of the second threaded segment; The thread groove depth of the second thread segment is greater than that of the third thread segment; The groove depth of the third threaded section first gradually increases and then gradually decreases in its extension direction.

2. The cable sheath extruder head according to claim 1, characterized in that, The groove depth of the first threaded segment is greater than or equal to 11 and less than or equal to 13. The groove depth of the second threaded section is greater than or equal to 9 and less than or equal to 10. The groove depth of the third threaded section is greater than or equal to 7 and less than or equal to 9.

3. The cable sheath extruder head according to claim 1, characterized in that, The cable sheath extruder head also includes: A first heating sleeve is fitted onto the first housing, and a first temperature sensor for detecting the temperature of the first heating sleeve is provided inside the first heating sleeve. The second heating jacket is fitted onto the second housing, and a second temperature sensor is provided inside the second heating jacket for detecting the temperature of the second heating jacket; The controller is connected to the first heating jacket, the first temperature sensor, the second heating jacket, and the second temperature sensor; The configuration module is used to configure the parameter attributes of the sheath material; The controller controls the predetermined heating temperature of the first heating jacket and the second heating jacket according to the parameters of the configuration module.

4. The cable sheath extruder head according to claim 3, characterized in that, The cable sheath extruder head also includes: A current detection module is connected to the drive motor that drives the screw and is used to detect the operating current of the drive motor. The controller is connected to the current detection module and dynamically corrects the predetermined heating temperature of the first heating jacket and the second heating jacket based on the operating current detected by the current detection module.

5. The cable sheath extruder head according to claim 4, characterized in that, When the current detection module detects that the operating current of the drive motor is greater than the normal operating current for a predetermined time, the controller increases the predetermined heating temperature of the first heating jacket and the second heating jacket by a preset value.

6. The cable sheath extruder head according to claim 1, characterized in that, The die head of the cable sheath extruder is used to extrude high flame retardant, low smoke, and halogen-free sheaths.

7. The cable sheath extruder head according to claim 1, characterized in that, When the core is an extrusion core, the aperture of the core is 0.4-1mm larger than the outer diameter of the cable core before sheath extrusion, and the aperture of the sleeve is 0.3-0.6mm larger than the outer diameter of the finished product after sheath extrusion.

8. The cable sheath extruder head according to claim 1, characterized in that, When the core is an extrusion tube type core, the aperture of the core is 1-2 mm larger than the outer diameter of the cable core before sheath extrusion, and the aperture of the sleeve is 1.5-2 times larger than the outer diameter of the finished product after sheath extrusion by the thickness of the extruded plastic layer.

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