A cable extrusion coating apparatus and method

Abstract

The present application relates to cable coating technical field, specifically said is a kind of cable extrusion coating device and method, including: core mould, for wearing wire core;Split outer mould, coaxially set in the core mould outside, the split outer mould is formed annular structure by at least three arc-shaped modules along the circumferential direction splicing, the inside of each arc-shaped module is equipped with radially extending partition, the partition is attached with the outer surface of the core mould, to form multiple circumferential independent distribution fan-shaped flow channel between core mould and split outer mould;Adjusting mechanism;And thickness monitor;Wherein, the drive unit is in response to the electrical signal of thickness monitor, can independently control the throttling area and melt pressure of corresponding fan-shaped flow channel.The split outer mould of the present application is spliced by multiple arc-shaped modules, each arc-shaped module is equipped with independent adjusting mechanism and thickness monitor, real-time monitoring cable eccentricity and feedback adjustment, realize circumferential pressure dynamic compensation, significantly improve the coaxiality of coating layer.

Description

Technical Field

[0001] This invention relates to the field of cable sheathing technology, specifically to a cable extrusion sheathing apparatus and method. Background Technology

[0002] In cable manufacturing, the extrusion coating process involves pushing molten material through an extruder screw to a die, forming a continuous and uniform coating layer on the surface of the core wire. However, existing technologies commonly suffer from cable eccentricity due to uneven material distribution, which severely affects product performance and reliability.

[0003] Traditional extrusion dies typically employ spiral or straight groove flow channels with a constant cross-section. The melt flow distribution depends solely on the initial design and cannot be adjusted in real time according to actual working conditions, which is not conducive to improving the eccentricity problem. Summary of the Invention

[0004] This invention addresses the problems in the prior art by providing a cable extrusion coating device and method, the specific technical solution of which is as follows:

[0005] On one hand, this application provides a cable extrusion coating apparatus, comprising:

[0006] Core mold, used for threading the wire core;

[0007] The split outer mold is coaxially sleeved outside the core mold. The split outer mold is formed by splicing at least three arc-shaped modules along the circumference to form a ring structure. Each arc-shaped module has a radially extending partition on its inner side. The partition is attached to the outer surface of the core mold to form multiple fan-shaped flow channels that are independently distributed along the circumference between the core mold and the split outer mold.

[0008] An adjustment mechanism is provided, wherein each of the arc-shaped modules is connected to the core mold through an independent adjustment mechanism, the adjustment mechanism including a drive unit, the output end of which is mounted on the arc-shaped module and connected to the core mold;

[0009] A thickness monitoring device is installed at the end of each of the arc-shaped modules to monitor the eccentricity of the cable sheath in real time and generate an electrical signal.

[0010] The drive unit responds to the electrical signal from the thickness monitor and drives the corresponding arc-shaped module to move along the core mold axis to adjust the throttling gap between the partition and the core mold, thereby independently controlling the throttling area and melt pressure of the corresponding fan-shaped flow channel.

[0011] As a further technical solution of the present invention, the core mold is a hollow cylindrical structure with a tapered part at its tail, and a throttling gap is formed between the tapered part and the pointed end of the tapered part and the split outer mold.

[0012] As a further technical solution of the present invention, the core mold head has an annular protrusion, and the arc-shaped module head has an overlapping portion corresponding to the annular protrusion. In the installed state, the overlapping portion overlaps on the annular protrusion to form a radial seal.

[0013] As a further technical solution of the present invention, a through-hole is provided in the core mold, and the head of the through-hole is flared.

[0014] As a further technical solution of the present invention, the adjustment mechanism further includes a connecting rod and a mounting plate. The connecting rod is connected to the output end of the drive unit and passes through the overlapping part. The mounting plate is fixed to the annular protrusion of the core mold by bolts and is connected to the connecting rod.

[0015] As a further technical solution of the present invention, each of the arc-shaped modules is provided with a through hole, the through hole is connected to the corresponding fan-shaped flow channel, and each through hole is independently connected to the output end of an external extruder.

[0016] As a further technical solution of the present invention, a reserved hole is provided on the overlapping part.

[0017] On the other hand, this application also provides a coating method for a cable extrusion coating device, the specific steps of which are as follows:

[0018] S1. Insert the wire core into the insertion channel of the core mold and drive the wire core to move along the core mold axis;

[0019] S2. Start the external extruder to allow the melt to enter the corresponding fan-shaped flow channel through the through holes of each arc module, and then coat the surface of the wire core through the throttling gap;

[0020] S3. The eccentricity of the cable sheath layer is monitored in real time by a thickness monitoring instrument. When a local thickness abnormality is detected, an electrical signal is generated and transmitted to the corresponding drive unit.

[0021] S4. The drive unit drives the corresponding arc-shaped module to move along the core mold axis according to the electrical signal, and adjusts the cross-sectional area of ​​the throttling gap to change the melt pressure and flow rate of the corresponding fan-shaped flow channel.

[0022] S5. By independently adjusting each arc module, the melt is evenly coated on the surface of the wire core in the circumferential direction to form a cable.

[0023] The beneficial effects of this invention are as follows:

[0024] (1) In this application, the split outer mold is composed of multiple arc-shaped modules, which supports partial disassembly and replacement, avoids scrapping the entire mold, and reduces maintenance costs; the flow channel is divided into independent areas, making it easy to clean up residues, reducing downtime and improving production efficiency.

[0025] (2) In this application, each arc module is equipped with an independent adjustment mechanism and a thickness monitoring instrument to monitor the cable eccentricity in real time and provide feedback adjustment, thereby achieving dynamic compensation of circumferential pressure and significantly improving the coaxiality of the coating layer. By adjusting the cross-sectional area of ​​the throttling gap, the local melt flow rate and pressure can be precisely controlled, avoiding thickness fluctuations caused by uneven pressure in traditional integrated molds.

[0026] (3) In this application, each flow channel is independently connected to the extruder through radial through holes, which supports the injection of differentiated materials or process parameters to meet the customized production needs of multilayer / composite cables; the modular design allows for quick adjustment of the number or layout of flow channels to adapt to the manufacturing of cables with different wire diameters or sheathing structures. Attached Figure Description

[0027] Figure 1 A schematic diagram of the overall structure of a cable extrusion coating device is shown;

[0028] Figure 2 A schematic diagram of the internal structure of the split outer mold is shown;

[0029] Figure 3 A schematic diagram of the core mold structure is shown;

[0030] Figure 4 A schematic diagram of the adjustment mechanism is shown.

[0031] Figure descriptions: 100, core mold; 110, conical part; 120, annular protrusion; 130, through channel; 200, split outer mold; 210, arc-shaped module; 220, partition; 230, through hole; 240, overlapping part; 241, reserved hole; 300, annular channel; 310, fan-shaped flow channel; 320, throttling gap; 330, conical flow channel; 400, adjusting mechanism; 410, drive unit; 420, connecting rod; 430, mounting plate. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0033] This application provides a cable extrusion coating device. Figure 1 A schematic diagram of the overall structure of a cable extrusion coating device is shown; Figure 1The cable extrusion coating device includes a core mold 100, a split outer mold 200 coaxially mounted outside the core mold 100, and an annular channel 300 formed between the core mold 100 and the split outer mold 200. The annular channel 300 is a flow channel formed between the core mold 100 and the split outer mold 200 after their installation, for supplying melt flow. In actual use, the annular channel 300 is connected to the output end of an external extruder. A wire core is inserted into the core mold 100. When the wire core is driven to pass through the core mold 100, a connecting port is formed at the junction of the outlet of the core mold 100 and the flow channel, and the melt coats the outside of the wire core through the connecting port.

[0034] Figure 2 A schematic diagram of the internal structure of the split outer mold 200 is shown; Figure 2 In this design, the split outer mold 200 is a split ring structure, comprising at least three sets of arc-shaped modules 210; that is, the split outer mold 200 is a ring structure assembled from at least three sets of arc-shaped modules 210; for example, Figure 2 The split-type outer mold 200 structure shown is composed of six sets of arc-shaped modules 210, each with an arc angle of 60 degrees, forming a sealed annular structure after assembly. By changing the traditional one-piece split-type outer mold 200 structure to a split structure, it is easier to clean the residue in the flow channel and replace local parts, which is beneficial for parts maintenance. Each arc-shaped module 210 has an inwardly extending partition 220 to form multiple non-interconnected fan-shaped flow channels 310. That is, in the installed state, the partition 220 fits against the outer surface of the core mold 100, which can divide the traditional one-piece annular channel 300 into multiple independent fan-shaped flow channels 310 in the circumferential direction. Each fan-shaped flow channel 310 does not interfere with each other, which is beneficial for subsequent adjustment of local pressure.

[0035] See also Figure 2Each arc-shaped module 210 is tunably connected to the core mold 100 via an adjustment mechanism 400, and each arc-shaped module 210 is equipped with a thickness monitoring instrument at its end to monitor cable eccentricity. The adjustment mechanism 400 can adjust the relative axial position of the core mold 100 and the split outer mold 200 in real time in response to the electrical signal from the thickness monitoring instrument to control the throttling area of ​​the fan-shaped flow channel 310. In other words, the thickness monitoring instrument can monitor the eccentricity of the covered cable in real time and feed the monitoring data back to the adjustment mechanism 400 via an electrical signal. The mechanism 400 can drive the independent arc-shaped module 210 to move axially relative to the core mold 100, thereby adjusting the throttling area of ​​the fan-shaped flow channel 310 to achieve local pressurization or depressurization, that is, the thickness of the fan-shaped flow channel 310 at the corresponding cable position is increased to achieve adjustment; that is, a set of adjustment mechanisms 400, a set of fan-shaped flow channels 310 and a set of arc-shaped modules 210 form an independent control system; and in the circumferential direction, several control systems are evenly distributed outside the core mold 100, which can adjust a certain point of the eccentric cable and adjust the coaxiality of the cable in real time.

[0036] See also Figure 2 Each arc-shaped module 210 has a through hole 230 radially opened to connect the fan-shaped flow channel 310; in actual use, each fan-shaped flow channel 310 is independently connected to the extruder through the through hole 230 to achieve individual material feeding.

[0037] Figure 3 A schematic diagram of the core mold 100 is shown; Figure 3 In the middle, the core mold 100 has a tapered part 110 at its tail, and a tapered flow channel 330 is formed between the tapered part 110 and the split outer mold 200. A throttling gap 320 is formed between the pointed end of the tapered part 110 and the split outer mold 200. That is, when the arc-shaped module 210 is axially displaced relative to the tapered part 110, the throttling area of ​​the throttling gap 320 in the corresponding flow channel can be adjusted to achieve the pressure change in the corresponding interval. A through-hole channel 130 is opened in the core mold 100, and the head of the through-hole channel 130 is flared. The flared shape of the insertion end of the through-hole channel 130 is conducive to the insertion of the wire core.

[0038] Figure 4 A schematic diagram of the adjusting mechanism 400 is shown; Figure 4 Combination Figure 3The core mold 100 has an annular protrusion 120 at its head, and the arc-shaped module 210 has an overlapping portion 240 that overlaps the annular protrusion 120 at its head. In the installed state, the overlapping portion 240 overlaps the annular protrusion 120 to form a radial seal, ensuring the sealing effect of the flow channel. The adjustment mechanism 400 includes a drive unit 410, a connecting rod 420, and a mounting plate 430. The drive unit 410 is mounted on the overlapping portion 240, the connecting rod 420 is connected to the output end of the drive unit 410 and passes through the overlapping portion 240, and the mounting plate 430 is mounted on the core mold by bolts. The core mold 100 is connected to the connecting rod 420, and the drive unit 410 is connected to the thickness monitor. In actual use, when the thickness monitor sends an electrical signal to the drive unit 410, the drive unit 410 starts, thereby forcing the core mold 100 and the corresponding arc module 210 to undergo axial displacement, thereby adjusting the throttling area of ​​the throttling gap 320. A reserved hole 241 is provided on the overlapping part 240. The reserved hole 241 is a through hole reserved for the installation and removal of bolts, which is conducive to the individual installation and removal of the arc module 210.

[0039] A method for applying a cable extrusion coating device, comprising the following specific steps:

[0040] S1. Insert the wire core into the insertion channel 130 of the core mold 100 and drive the wire core to move along the axial direction of the core mold 100.

[0041] S2. Start the external extruder so that the melt enters the corresponding fan-shaped flow channel 310 through the through hole 230 of each arc module 210, and is covered on the surface of the wire core through the throttling gap 320.

[0042] S3. The eccentricity of the cable sheath layer is monitored in real time by a thickness monitoring instrument. When a local thickness abnormality is detected, an electrical signal is generated and transmitted to the corresponding drive unit 410.

[0043] S4. The drive unit 410 drives the corresponding arc module 210 to move along the core mold 100 axially according to the electrical signal, and adjusts the cross-sectional area of ​​the throttling gap 320 to change the melt pressure and flow rate of the corresponding fan-shaped flow channel 310.

[0044] S5. Through the independent adjustment of each arc module 210, the melt is uniformly wrapped around the surface of the wire core in the circumferential direction to form a cable.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A cable extrusion coating apparatus, comprising: Core mold (100), used for threading the wire core; A split outer mold (200) is coaxially sleeved on the outside of the core mold (100). The split outer mold (200) is formed by splicing at least three arc-shaped modules (210) in a circumferential direction to form a ring structure. Each arc-shaped module (210) has a radially extending partition (220) on its inner side. The partition (220) is attached to the outer surface of the core mold (100) to form multiple fan-shaped flow channels (310) that are independently distributed in a circumferential direction between the core mold (100) and the split outer mold (200). An adjustment mechanism (400) is provided, wherein each of the arc-shaped modules (210) is connected to the core mold (100) via an independent adjustment mechanism (400). The adjustment mechanism (400) includes a drive unit (410), which is mounted on the arc-shaped module (210) and its output end is connected to the core mold (100). A thickness monitoring device is installed at the end of each of the arc modules (210) to monitor the eccentricity of the cable sheath in real time and generate an electrical signal; The drive unit (410) responds to the electrical signal of the thickness monitor and drives the corresponding arc module (210) to move along the axial direction of the core mold (100) to adjust the throttling gap (320) between the partition (220) and the core mold (100), thereby independently controlling the throttling area and melt pressure of the corresponding fan-shaped flow channel (310).

2. The cable extrusion coating device according to claim 1, characterized in that, The core mold (100) is a hollow cylindrical structure with a tapered part (110) at its tail. A throttling gap (320) is formed between the pointed end of the tapered part (110) and the split outer mold (200).

3. The cable extrusion coating device according to claim 2, characterized in that: The head of the core mold (100) has an annular protrusion (120), and the head of the arc-shaped module (210) has an overlapping portion (240) corresponding to the annular protrusion (120). In the installed state, the overlapping portion (240) overlaps on the annular protrusion (120) to form a radial seal.

4. The cable extrusion coating device according to claim 3, characterized in that: The core mold (100) has a through-hole (130) inside, and the head of the through-hole (130) is flared.

5. The cable extrusion coating device according to claim 3, characterized in that: The adjustment mechanism (400) also includes a connecting rod (420) and a mounting plate (430). The connecting rod (420) is connected to the output end of the drive unit (410) and passes through the overlapping part (240). The mounting plate (430) is fixed to the annular protrusion (120) of the core mold (100) by bolts and is connected to the connecting rod (420).

6. The cable extrusion coating device according to claim 3, characterized in that: Each of the arc-shaped modules (210) is provided with a through hole (230), which is connected to the corresponding fan-shaped flow channel (310), and each through hole (230) is independently connected to the output end of an external extruder.

7. The cable extrusion coating device according to claim 3, characterized in that: The overlapping part (240) is provided with a reserved hole (241).

8. The coating method of the cable extrusion coating device according to claim 6, characterized in that, The specific steps are as follows: S1. Insert the wire core into the insertion channel (130) of the core mold (100) and drive the wire core to move axially along the core mold (100); S2. Start the external extruder so that the melt enters the corresponding fan-shaped flow channel (310) through the through hole (230) of each arc module (210) and is covered on the surface of the wire core through the throttling gap (320); S3. The eccentricity of the cable sheath is monitored in real time by a thickness monitoring instrument. When a local thickness abnormality is detected, an electrical signal is generated and transmitted to the corresponding drive unit (410). S4. The drive unit (410) drives the corresponding arc module (210) to move along the core mold (100) axially according to the electrical signal, and adjusts the cross-sectional area of ​​the throttling gap (320) to change the melt pressure and flow rate of the corresponding fan-shaped flow channel (310). S5. By independently adjusting each arc module (210), the melt is uniformly wrapped around the surface of the wire core in the circumferential direction to form a cable.

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