Cable insulation sleeve extruder die head and cable processing method

Abstract

This invention relates to the field of extruder die technology, and discloses a cable insulation sleeve extruder die and a cable processing method. The cable insulation sleeve extruder die includes a shell with an internal receiving cavity, a first core rod, and a second core rod disposed inside the receiving cavity. The second core rod is fixedly disposed at one end of the first core rod, and an annular groove is formed on the outer circumferential surface of the first core rod. When the insulation layer of the cable conductor core is attached, the sleeve moves away from the second core rod along the central axis of the first core rod. At this time, with the sleeve as the dividing line, the space near the second core rod in the receiving cavity instantly increases, thereby reducing the pressure of the molten plastic inside the current space. The molten plastic will no longer flow out from the outlet end of the gap, thus preventing the through hole of the second core rod from being blocked by molten plastic, ensuring that the subsequent cable conductor core can pass through the through hole normally.

Description

Technical Field

[0001] This invention relates to the field of extruder die technology, and more particularly to cable insulation sleeve extruder die and cable processing method. Background Technology

[0002] The die head of a cable insulation extruder is one of the most critical "molds" in the cable production line. It determines the thickness, concentricity, roundness, and surface quality of the insulation layer. If the extruder is the "furnace," then the die head is the "shaper." The cable insulation extruder die head is the "mold" for producing the insulation layer of wires and cables, where molten plastic is given precise dimensions and shapes, uniformly coating the conductor.

[0003] In existing cable insulation extruder dies, molten plastic is shaped into a thin-walled tube by passing through the annular gap between the die core and the die sleeve. The inner diameter of this "tube" is determined by the outer diameter of the die core, and the outer diameter is determined by the inner diameter of the die sleeve. When the cable conductor core passes through the center of the die core, this thin-walled tube is evenly stretched and wrapped around the cable conductor core, forming the required insulation layer. When the cable conductor core exits the insulation layer, it emerges from the hole in the center of the die core. However, the annular gap between the die core and the die sleeve is still filled with molten plastic. Due to the high pressure exerted by the injection molding machine, the molten plastic flows into the hole in the center of the die core the instant the cable conductor core emerges, blocking the hole and making subsequent threading difficult, thus affecting the production of the cable conductor. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a cable insulation sleeve extruder die and a cable processing method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The extrusion die for cable insulation sleeves includes: The outer shell has an internal cavity for receiving the contents. The first core rod and the second core rod are disposed inside the receiving cavity. The second core rod is fixedly disposed at one end of the first core rod. An annular groove is formed on the outer circumferential surface of the first core rod. A circular sleeve is fitted onto the outer surface of the annular groove and can move along the central axis of the first core rod. Multiple mounting grooves are equidistantly opened on the outer circumference of the circular sleeve. Several arc plates are respectively disposed inside multiple mounting slots. The arc plates are coupled to a circular sleeve. The arc plates are configured to drive the arc plates to radiate along the diameter of the circular sleeve when the circular sleeve moves along the central axis of the first core rod.

[0006] As a further embodiment of the present invention, one end of the second core rod is inserted into the interior of the first core rod, and both the first and second core rods have through holes that are connected to each other, and a gap is provided between the first and second core rods and the inner wall of the receiving cavity.

[0007] As a further embodiment of the present invention, the first core rod is provided with a plurality of first through slots at equal intervals on the outer surface of the annular groove, and the second core rod is provided with a plurality of second through slots at equal intervals on the outer circumferential surface near one end of the first core rod. The first through slots are connected to the second through slots. The inner wall of the circular sleeve is fixedly connected with a plurality of connecting rods at equal intervals. The connecting rods are disposed inside the first through slots and the second through slots. The second core rod is provided with a first circular hole and a second circular hole at one end near the first core rod. The diameter of the second circular hole is smaller than that of the first circular hole.

[0008] As a further embodiment of the present invention, a ring is slidably installed on the inner wall of the first circular hole, the bottom end of the connecting rod passes through the second through groove and is fixedly connected to the outer surface of the ring, a spring is fixedly connected to the outer surface of the ring near the second circular hole, and the other end of the spring is fixedly connected to the inner wall of the second circular hole.

[0009] As a further embodiment of the present invention, the inner wall of the ring is provided with a plurality of openings at equal intervals, and a rotating shaft is rotatably installed between the inner walls of the plurality of openings. A rotating block is fixedly installed on the outer surface of the rotating shaft, and a baffle is fixedly connected to the outer surface of the rotating block. A plurality of insert blocks are provided at equal intervals on the end face of the ring near the first core rod. The plurality of insert blocks are configured to move closer to or further away from each other along the diameter direction of the ring.

[0010] As a further embodiment of the present invention, a second guide post is provided at the bottom end of the insert block, a first guide groove is provided on the outer surface of the rotating block, the second guide post is slidably installed with the inner wall of the first guide groove, and torsion springs are sleeved at both ends of the rotating shaft. One end of the torsion spring is fixedly connected to the outer surface of the rotating shaft, and the other end of the torsion spring is fixedly connected to the inner wall of the opening.

[0011] As a further embodiment of the present invention, a plurality of square holes are equidistantly provided on the outer surface of the mounting groove. The square holes are provided with connecting rods and rings. The bottom end of the square hole is connected to the opening. A square rod is slidably inserted into the inner wall of the square hole. One end of the square rod is fixedly connected to the outer surface of the arc plate. The other end of the square rod is provided with a first guide post through the square hole. A second guide groove is provided on the outer surface of the rotating block. The first guide post is slidably installed on the inner wall of the second guide groove.

[0012] As a further embodiment of the present invention, a vent hole is provided through the interior of the square rod, the bottom end of the vent hole is connected to the through hole inside the second core rod, and the top end of the vent hole is connected to the mounting groove through the outer surface of the square rod near the top end.

[0013] As a further embodiment of the present invention, a sliding groove is provided on the outer surface of the insert block, and a plurality of T-shaped blocks are fixedly installed at equal intervals on the end face of the ring near the first core rod. The T-shaped blocks are slidably installed with the inner wall of the sliding groove.

[0014] As a further aspect of the present invention, the cable processing method includes the following steps: S1: The cable conductor core is inserted into the through hole through the first core rod and the second core rod. Then, one end of the cable conductor core is pulled out from the outlet end of the through hole of the second core rod, so that the cable conductor core passes through the through hole continuously. S2: Several arc plates move closer to each other along the diameter of the sleeve and are completely housed inside the mounting groove. The outer arc surface of the arc plate is flush with the outer circumference of the sleeve. At this time, the molten plastic can flow normally between the sleeve and the inner wall of the receiving cavity. S3: The sleeve moves away from the second core rod along the central axis of the first core rod. At this time, with the sleeve as the dividing line, the space of the receiving cavity close to the second core rod increases instantly, thereby reducing the pressure of the molten plastic inside the current space. S4: The sleeve moves away from the second core rod along the central axis of the first core rod. At this time, several arc plates will move away from each other along the diameter of the sleeve and extend out from the inside of the mounting groove.

[0015] When the insulation layer of the cable conductor core is attached, the circular sleeve moves away from the second core rod along the central axis of the first core rod. At this time, with the circular sleeve as the dividing line, the space of the receiving cavity near the second core rod increases instantaneously, thereby reducing the pressure of the molten plastic inside the current space. The molten plastic will not flow out from the outlet end of the gap, thus preventing the through hole of the second core rod from being blocked by the molten plastic, ensuring that the subsequent cable conductor core can pass through the through hole normally. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the extruder die head for cable insulation sleeves proposed in this invention; Figure 2 This is a perspective structural diagram of the extruder die head for cable insulation sleeves proposed in this invention; Figure 3 This is a cross-sectional schematic diagram of the outer shell of the extruder die head for cable insulation sleeves proposed in this invention; Figure 4 This is a cross-sectional view of the extruder die head for cable insulation sleeves proposed in this invention. Figure 5 This is a schematic diagram of the first core rod of the extruder die head for cable insulation sleeves proposed in this invention; Figure 6 This is a cross-sectional schematic diagram of the first core rod of the extruder die head for cable insulation sleeves proposed in this invention; Figure 7 This is a schematic diagram of the second core rod of the extruder die head for cable insulation sleeves proposed in this invention; Figure 8 This is a cross-sectional schematic diagram of the second core rod of the extruder die head for cable insulation sleeves proposed in this invention; Figure 9 This is a schematic diagram of the internal structure of the second core rod of the extruder die for cable insulation sleeves proposed in this invention; Figure 10 This is a schematic diagram of the annular shape of the extruder die head for the cable insulation sleeve proposed in this invention; Figure 11 This is a schematic diagram of the circular sleeve of the extruder die head for cable insulation sleeves proposed in this invention; Figure 12 This is a schematic diagram of the arc plate of the extruder die head for cable insulation sleeves proposed in this invention; Figure 13 This is a cross-sectional schematic diagram of the square rod of the extruder die for the cable insulation sleeve proposed in this invention; Figure 14 This is a schematic diagram of the insertion block of the extruder die for the cable insulation sleeve proposed in this invention; Figure 15 for Figure 10 A magnified view of a portion of point A in the middle.

[0017] In the picture: 100, outer shell; 110, feed port; 120, receiving cavity; 200, first core rod; 210, flow channel; 220, annular groove; 230, first through groove; 300, Second core rod; 310, Second through groove; 320, First round hole; 330, Second round hole; 400, Round sleeve; 410, Mounting groove; 420, Square hole; 500, Arc plate; 600, Square rod; 610, First guide post; 620, Vent hole; 700, Ring; 710, Opening; 800, Spring; 900, Shaft; 1000, Torsion spring; 1100, T-block; 1200, insert block; 1210, second guide post; 1220, slide groove; 1300, rotating block; 1310, baffle; 1320, first guide groove; 1330, second guide groove; 1400, connecting rod. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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 orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] To prevent molten plastic from flowing into the hole in the center of the mold core the instant the cable conductor core emerges, such as... Figure 1 Figure 2 As shown, this invention proposes a die head for a cable insulation sleeve extruder. The die head includes: a housing 100, a first core rod 200, a second core rod 300, a circular sleeve 400, and several arc-shaped plates 500. Specifically, as shown... Figure 3 As shown, the outer casing 100 has a receiving cavity 120 inside. The first core rod 200 and the second core rod 300 are disposed inside the receiving cavity 120. In actual use, the first core rod 200 and the second core rod 300 are assembled and then fixed inside the receiving cavity 120 by fixing the end face, as shown. Figure 4 and Figure 5As shown, one end of the second core rod 300 is inserted into the interior of the first core rod 200. Both the first core rod 200 and the second core rod 300 have through holes that are connected to each other. A gap is provided between the first core rod 200 and the second core rod 300 and the inner wall of the receiving cavity 120. The cable conductor core is inserted into the through holes of the first core rod 200 and the second core rod 300. Then, one end of the cable conductor core is pulled out from the outlet end of the through hole of the second core rod 300 and connected to the external dragging mechanism, so that the cable conductor core continuously passes through the through hole. At this time, the molten plastic in the gap also flows out from the position near the outlet end of the second core rod 300, forming a tubular thin-walled plastic film, which is then attached to the outer surface of the cable conductor core, completing the attachment of the insulating sleeve.

[0022] In this embodiment, in order to release the pressure on the molten plastic in the gap after the cable conductor core insulation layer has finished attaching, such as... Figure 4 As shown, an annular groove 220 is formed on the outer circumferential surface of the first core rod 200, and a circular sleeve 400 is fitted onto the outer surface of the annular groove 220. The circular sleeve 400 can move along the central axis of the first core rod 200. When the device is applying an insulation layer to the surface of the cable conductor core, such as... Figure 3 and Figure 4 As shown, the inner wall of the circular sleeve 400 and the annular groove 220 near the second core rod 300 is completely fitted. When the insulation layer of the cable conductor core is finished, the circular sleeve 400 moves away from the second core rod 300 along the central axis of the first core rod 200. At this time, with the circular sleeve 400 as the dividing line, the space of the receiving cavity 120 near the second core rod 300 increases instantaneously, thereby reducing the pressure of the molten plastic inside the current space. The molten plastic will no longer flow out from the outlet end of the gap, thus preventing the through hole of the second core rod 300 from being blocked by the molten plastic, ensuring that the subsequent cable conductor core can pass through the through hole normally.

[0023] In this embodiment, in order to allow the molten plastic to flow within the gap, a certain distance is provided between the outer circumferential surface of the sleeve 400 and the inner wall of the receiving cavity 120. This distance causes a large amount of molten plastic to leak out when the sleeve 400 moves away from the second core rod 300 along the central axis of the first core rod 200, resulting in poor pressure reduction of the molten plastic in the space near the second core rod 300 in the receiving cavity 120. To solve this problem, such as Figure 6 , Figure 7 and Figure 11As shown, the outer circumference of the sleeve 400 is provided with multiple mounting grooves 410 at equal intervals. Several arc plates 500 are respectively disposed inside the mounting grooves 410. The arc plates 500 are coupled to the sleeve 400. The arc plates 500 are configured to radiate radially along the diameter of the sleeve 400 when the sleeve 400 moves along the central axis of the first core rod 200. Specifically, when the cable conductor core is properly covered with insulation, i.e., when the sleeve 400 and the inner wall of the annular groove 220 near the second core rod 300 are completely in contact, the arc plates 500 move closer to each other along the diameter of the sleeve 400, completely housed inside the mounting grooves 410, and the arc-shaped outer surface of the arc plates 500 is flush with the outer circumference of the sleeve 400. At this time, the molten plastic can flow normally through the gap between the sleeve 400 and the inner wall of the receiving cavity 120. When the insulation layer of the cable conductor core is finished, the sleeve 400 moves away from the second core rod 300 along the central axis of the first core rod 200. At this time, several arc plates 500 will move away from each other along the diameter of the sleeve 400. The part extending from the inside of the mounting groove 410 blocks part of the gap between the outer circumference of the sleeve 400 and the inner wall of the receiving cavity 120. This makes less molten plastic leak out when the sleeve 400 moves away from the second core rod 300 along the central axis of the first core rod 200. This makes the pressure reduction effect of the molten plastic in the space of the receiving cavity 120 near the second core rod 300 better, and prevents the molten plastic from flowing out from the outlet end of the gap near the second core rod 300 due to high pressure.

[0024] In this embodiment, in order to drive the circular sleeve 400 to move along the central axis of the first core rod 200, such as... Figure 6 , Figure 7 and Figure 8 As shown, the first core rod 200 has multiple first through slots 230 equidistantly formed on the outer surface of the annular groove 220, and the second core rod 300 has multiple second through slots 310 equidistantly formed on the outer circumferential surface near one end of the first core rod 200. The first through slots 230 and the second through slots 310 are connected. Multiple connecting rods 1400 are fixedly connected equidistantly to the inner wall of the circular sleeve 400. The connecting rods 1400 are disposed inside the first through slots 230 and the second through slots 310, as shown. Figure 9As shown, the second core rod 300 has a first circular hole 320 and a second circular hole 330 inside the end near the first core rod 200. The diameter of the second circular hole 330 is smaller than that of the first circular hole 320, so that the first circular hole 320 and the second circular hole 330 form a step. A ring 700 is slidably installed on the inner wall of the first circular hole 320. The bottom end of the connecting rod 1400 passes through the second through groove 310 and is fixedly connected to the outer surface of the ring 700. A spring 800 is fixedly connected to the outer surface of the ring 700 near the second circular hole 330. The other end of the spring 800 is fixedly connected to the inner wall of the second circular hole 330. In actual use... When the ring 700 is pushed and moves towards the second core rod 300 along the central axis of the first core rod 200, the ring 700 drives the sleeve 400 to move towards the second core rod 300 along the central axis of the first core rod 200 through multiple connecting rods 1400. At this time, the device can normally perform insulation layer covering processing on the surface of the cable conductor core. When the insulation layer of the cable conductor core is attached, the elastic force of the spring 800 causes the sleeve 400 to move away from the second core rod 300 along the central axis of the first core rod 200, thereby reducing the pressure on the molten plastic in the space of the receiving cavity 120 near the second core rod 300.

[0025] In this embodiment, in order to push the ring 700 to move closer to the second core rod 300 along the central axis of the first core rod 200, such as... Figure 10 and Figure 11 As shown, the inner wall of the annulus 700 has multiple openings 710 at equal intervals. A rotating shaft 900 is rotatably mounted between the inner walls of each opening 710. A rotating block 1300 is fixedly mounted on the outer surface of the rotating shaft 900. A baffle 1310 is fixedly connected to the outer surface of the rotating block 1300. Torsion springs 1000 are sleeved at both ends of the rotating shaft 900. One end of the torsion spring 1000 is fixedly connected to the outer surface of the rotating shaft 900, and the other end is fixedly connected to the inner wall of the opening 710. Before the cable conductor core insulation layer is attached, it is... The force of the torsion spring 1000 keeps the rotating block 1300 in its initial position. At this time, the position of the baffle 1310 is parallel to the diameter of the ring 700. The adjacent ends of the multiple baffles 1310 are close to each other. When the cable conductor core is inserted into the through hole, it moves closer to the baffle 1310 along the direction of the through hole. At this time, the end of the cable conductor core abuts against the adjacent ends of the multiple baffles 1310. As the cable conductor core is continuously pushed in, it will drive the ring 700 to move closer to the second core rod 300 along the central axis of the first core rod 200 through the baffle 1310.

[0026] Because the rotating block 1300 is rotatably mounted between the inner walls of the opening 710 via the rotating shaft 900, in order for the cable conductor core to be able to push the baffle 1310, such as Figure 15 and Figure 12 As shown, a plurality of insert blocks 1200 are equidistantly arranged on the end face of the ring 700 near the first core rod 200, and a second guide post 1210 is provided at the bottom end of each insert block 1200. Figure 14 As shown, the outer surface of the rotating block 1300 is provided with a first guide groove 1320, and the second guide post 1210 is slidably installed with the inner wall of the first guide groove 1320. The plurality of insert blocks 1200 are configured to move closer to or further away from each other along the diameter of the ring 700. Before the cable conductor core insulation layer is attached, the force of the torsion spring 1000 keeps the rotating block 1300 in its initial position. At this time, the adjacent ends of the plurality of baffles 1310 are close to each other. The rotating block 1300 is connected to the first guide groove 1320 by the second guide post 1210. The coordination of 0 causes multiple plugs 1200 to be in a state of close proximity to each other. At this time, the top of the plug 1200 is flush with the inner wall of the first circular hole 320. When the end of the cable conductor core abuts against the adjacent end of the multiple baffles 1310, because the top of the plug 1200 is blocked by the inner wall of the first circular hole 320, the multiple baffles 1310 are still in a state parallel to the diameter of the ring 700. When the end of the cable conductor core pushes the baffle 1310, the rotating block 1300 will not rotate, thereby causing the ring 700 to move closer to the second core rod 200 along the central axis direction. As the core rod 300 moves, the top of the insertion block 1200 slides against the inner wall of the first circular hole 320 towards the second core rod 300 until it moves to the position of the second through slot 310. At this point, the top of the insertion block 1200 is no longer pressed against the second core rod 300, and the baffle 1310 is pushed by the end of the cable conductor core to rotate towards the second core rod 300. The baffle 1310 drives the rotating block 1300 to rotate. The rotating block 1300, through the cooperation of the second guide post 1210 and the first guide slot 1320, drives the insertion block 1200 to insert along the diameter direction of the ring 700. The cable conductor core is inserted into the second through slot 310. At this point, the baffle 1310 rotates and tilts, allowing the cable conductor core to pass through the multiple baffles 1310. Because the cable conductor core has a certain diameter, the bottom ends of the multiple baffles 1310 abut against the outer surface of the cable conductor core, allowing the insert block 1200 to continue inserting into the second through slot 310. This arrangement restricts the position of the ring 700, ensuring that the sleeve 400 and the inner wall of the annular groove 220 near the second core rod 300 are completely fitted, facilitating subsequent insulation layer coverage of the cable conductor core. It is important to note that the tilting direction of the baffle 1310 is the same as the forward direction of the cable conductor core, thus preventing the baffle 1310 from interfering with the forward movement of the cable conductor core.

[0027] In this embodiment, in order to limit the installation position of the insert 1200 on the end face of the ring 700, such as Figure 10 and Figure 15 As shown, the outer surface of the insert 1200 is provided with a sliding groove 1220. Multiple T-shaped blocks 1100 are fixedly installed at equal intervals on the end face of the ring 700 near the first core rod 200. The T-shaped blocks 1100 are slidably installed with the inner wall of the sliding groove 1220. The installation position of the insert 1200 is restricted by the cooperation between the T-shaped blocks 1100 and the sliding groove 1220.

[0028] To ensure proper insulation layer coverage during cable conductor core production, several arc-shaped plates 500 move closer to each other along the diameter of the sleeve 400, completely retracting into the mounting groove 410. Figure 11 , Figure 12 and Figure 14 As shown, the outer surface of the mounting groove 410 is provided with a plurality of square holes 420 at equal intervals. The square holes 420 pass through the connecting rod 1400 and the ring 700. The bottom end of each square hole 420 is connected to the opening 710. A square rod 600 is slidably inserted into the inner wall of each square hole 420. One end of the square rod 600 is fixedly connected to the outer surface of the arc plate 500, and the other end of the square rod 600 passes through the square hole 420 and is provided with a first guide post 610. The rotating block... The outer surface of 1300 is provided with a second guide groove 1330. The first guide post 610 is slidably installed on the inner wall of the second guide groove 1330. When the baffle 1310 is pushed by the cable conductor core and rotates towards the second core rod 300, the square rod 600 is driven to move towards the ring 700 through the cooperation of the first guide post 610 and the second guide groove 1330. This causes the arc plate 500 to move closer to each other along the diameter direction of the sleeve 400 and be completely housed inside the mounting groove 410.

[0029] In this embodiment, when the insulation layer on the surface of the cable conductor core is attached and the processing is completed, because the cable conductor core no longer supports the tilt of the baffle 1310, the baffle 1310 is reset under the force of the torsion spring 1000. At this time, the insert block 1200 slides out from the inside of the second through groove 310, releasing the restriction on the ring 700. At the same time, the arc plate 500 extends out from the inside of the mounting groove 410, and then, under the elastic force of the spring 800, drives the ring 700 and the sleeve 400 to move away from the second core rod 300.

[0030] In this embodiment, because the arc plate 500 extends and retracts within the mounting groove 410, and the shape of the arc plate 500 matches the inner wall of the mounting groove 410, in order to ensure normal gas flow during the movement of the arc plate 500, such as Figure 13As shown, a vent hole 620 is provided through the interior of the square rod 600. The bottom end of the vent hole 620 is connected to the through hole inside the second core rod 300, and the top end of the vent hole 620 is connected to the mounting groove 410 through the outer surface of the square rod 600 near the top end.

[0031] In this embodiment, when the device attaches an insulation layer to the surface of the cable conductor core, a certain gap space is provided between the inner wall of the annular groove 220 near the first core rod 200 and the outer surface of the circular sleeve 400. This space provides a certain movement distance for the circular sleeve 400. At the same time, when molten plastic is discharged from the flow channel 210, it can first flow into this gap space to accumulate and fuse the molten plastic, so that the surface of the tubular film will not be uneven in thickness when the material is discharged later.

[0032] In this embodiment, a feeding port 110 is provided through the outer surface of the outer shell 100, and a flow channel 210 is provided on the outer surface of the first core rod 200. The feeding port 110 is connected to the receiving cavity 120 through the flow channel 210. When attaching an insulation layer to the surface of the cable conductor core, molten plastic is squeezed in through the feeding port 110, and then flows into the receiving cavity 120 along the flow channel 210, and then flows out from the outlet end of the gap.

[0033] In this embodiment, the cable processing method includes the following steps: S1: The cable conductor core is inserted into the through hole through the first core rod 200 and the second core rod 300. Then, one end of the cable conductor core is pulled out from the outlet end of the through hole of the second core rod 300, so that the cable conductor core passes through the through hole continuously. S2: Several arc plates 500 move closer to each other along the diameter of the sleeve 400 and are completely housed inside the mounting groove 410. The outer arc surface of the arc plate 500 is flush with the outer circumferential surface of the sleeve 400. At this time, the molten plastic can flow normally between the sleeve 400 and the inner wall of the receiving cavity 120. S3: The sleeve 400 moves away from the second core rod 300 along the central axis of the first core rod 200. At this time, with the sleeve 400 as the dividing line, the space of the receiving cavity 120 near the second core rod 300 increases instantaneously, thereby reducing the pressure of the molten plastic inside the current space. S4: The sleeve 400 moves away from the second core rod 300 along the central axis of the first core rod 200. At this time, several arc plates 500 will move away from each other along the diameter of the sleeve 400 and extend out from the inside of the mounting groove 410.

[0034] 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 present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A die head for a cable insulation sleeve extruder, characterized in that, include: The outer shell (100) has an internal cavity (120). The first core rod (200) and the second core rod (300) are disposed inside the receiving cavity (120). The second core rod (300) is fixedly disposed at one end of the first core rod (200). The outer circumferential surface of the first core rod (200) is provided with an annular groove (220). A circular sleeve (400) is fitted onto the outer surface of the annular groove (220) and can move along the central axis of the first core rod (200). The outer circumferential surface of the circular sleeve (400) is provided with a plurality of mounting grooves (410) at equal intervals. Several arc plates (500) are respectively disposed inside multiple mounting slots (410). The arc plates (500) are coupled to the circular sleeve (400). The arc plates (500) are configured to drive the arc plates (500) to radiate along the diameter direction of the circular sleeve (400) when the circular sleeve (400) moves along the central axis of the first core rod (200).

2. The extruder die for cable insulation sleeves according to claim 1, characterized in that, One end of the second core rod (300) is inserted into the interior of the first core rod (200). Both the first core rod (200) and the second core rod (300) have through holes that are connected to each other. There is a gap between the first core rod (200) and the second core rod (300) and the inner wall of the receiving cavity (120).

3. The extruder die for cable insulation sleeves according to claim 2, characterized in that, The first core rod (200) has multiple first through slots (230) equidistantly opened on the outer surface of the annular groove (220). The second core rod (300) has multiple second through slots (310) equidistantly opened on the outer circumferential surface near one end of the first core rod (200). The first through slots (230) and the second through slots (310) are connected. The inner wall of the circular sleeve (400) is fixedly connected with multiple connecting rods (1400) equidistantly. The connecting rods (1400) are disposed inside the first through slots (230) and the second through slots (310). The second core rod (300) has a first circular hole (320) and a second circular hole (330) equidistantly opened on the inner surface of one end of the first core rod (200). The diameter of the second circular hole (330) is smaller than that of the first circular hole (320).

4. The extruder die for cable insulation sleeves according to claim 3, characterized in that, A ring (700) is slidably installed on the inner wall of the first circular hole (320). The bottom end of the connecting rod (1400) passes through the second through groove (310) and is fixedly connected to the outer surface of the ring (700). A spring (800) is fixedly connected to the outer surface of the ring (700) near the second circular hole (330). The other end of the spring (800) is fixedly connected to the inner wall of the second circular hole (330).

5. The extruder die for cable insulation sleeves according to claim 4, characterized in that, The inner wall of the ring (700) is provided with a plurality of openings (710) at equal intervals. A rotating shaft (900) is rotatably installed between the inner walls of the plurality of openings (710). A rotating block (1300) is fixedly installed on the outer surface of the rotating shaft (900). A baffle (1310) is fixedly connected to the outer surface of the rotating block (1300). A plurality of inserts (1200) are provided at equal intervals on the end face of the ring (700) near the first core rod (200). The plurality of inserts (1200) are configured to move closer to or further away from each other along the diameter direction of the ring (700).

6. The extruder die for cable insulation sleeves according to claim 5, characterized in that, The bottom end of the insert (1200) is provided with a second guide post (1210), and the outer surface of the rotating block (1300) is provided with a first guide groove (1320). The second guide post (1210) is slidably installed with the inner wall of the first guide groove (1320). Both ends of the rotating shaft (900) are fitted with torsion springs (1000). One end of the torsion spring (1000) is fixedly connected to the outer surface of the rotating shaft (900), and the other end of the torsion spring (1000) is fixedly connected to the inner wall of the opening (710).

7. The extruder die for cable insulation sleeves according to claim 6, characterized in that, The outer surface of the mounting groove (410) is provided with a plurality of square holes (420) at equal intervals. The square holes (420) are provided with connecting rods (1400) and rings (700) passing through them. The bottom end of the square holes (420) is connected to the opening (710). A square rod (600) is slidably inserted into the inner wall of the square holes (420). One end of the square rod (600) is fixedly connected to the outer surface of the arc plate (500). The other end of the square rod (600) is provided with a first guide post (610) through the square holes (420). The outer surface of the rotating block (1300) is provided with a second guide groove (1330). The first guide post (610) is slidably installed on the inner wall of the second guide groove (1330).

8. The extruder die for cable insulation sleeves according to claim 7, characterized in that, The square rod (600) has a through-hole (620) inside. The bottom end of the through-hole (620) is connected to the through hole inside the second core rod (300). The top end of the through-hole (620) passes through the outer surface of the square rod (600) near the top end and is connected to the mounting groove (410).

9. The extruder die for cable insulation sleeves according to claim 8, characterized in that, The outer surface of the insert (1200) is provided with a sliding groove (1220). Multiple T-shaped blocks (1100) are fixedly installed at equal intervals on the end face of the ring (700) near the first core rod (200). The T-shaped blocks (1100) are slidably installed on the inner wall of the sliding groove (1220).

10. A cable processing method, characterized in that, The cable insulation sheath extruder die as described in claim 9 includes the following steps: S1: The cable conductor core is inserted into the through hole through the first core rod (200) and the second core rod (300), and then one end of the cable conductor core is pulled out from the outlet end of the through hole of the second core rod (300), so that the cable conductor core passes through the through hole continuously. S2: Several arc plates (500) move closer to each other along the diameter direction of the sleeve (400) and are completely housed inside the mounting groove (410). The outer arc surface of the arc plate (500) is flush with the outer circumferential surface of the sleeve (400). At this time, the molten plastic can flow normally between the sleeve (400) and the inner wall of the receiving cavity (120). S3: The sleeve (400) moves away from the second core rod (300) along the central axis of the first core rod (200). At this time, with the sleeve (400) as the dividing line, the space of the receiving cavity (120) close to the second core rod (300) increases instantaneously, thereby reducing the pressure of the molten plastic inside the current space. S4: The sleeve (400) moves away from the second core rod (300) along the central axis of the first core rod (200). At this time, several arc plates (500) will move away from each other along the diameter of the sleeve (400) and extend out from the inside of the mounting groove (410).

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