Extrusion device and method for cable production

Abstract

The invention provides an extrusion device and method for cable production. The extrusion device comprises a rack, an extrusion mold, a wire conduit and a wire core surface treatment device, wherein the wire conduit is horizontally and fixedly arranged on the rack, is connected with the extrusion die and is used for guiding a wire core to enter the extrusion die; the wire core surface treatment device comprises a plurality of extrusion rods and a driving mechanism, the plurality of extrusion rods are uniformly arranged around the central axis of the wire conduit, one end of each extrusion rod is located in the wire conduit and is provided with an embossing bulge, and the other end of each extrusion rod movably penetrates through the outer side of the wire conduit in the radial direction of the wire conduit; and the driving mechanism is arranged on the outer side of the wire conduit and is used for synchronously driving the plurality of extrusion rods to reciprocate, so that the embossing bulges apply embossing on the outer surface of the wire core. The embossing is applied to the surface of the wire core, so that the contact area and the friction coefficient between the wire core and the insulating layer are increased, the adhesive force between the insulating layer and the wire core is improved, and the insulating layer is more stable and is not easy to strip or slide in the coating process.

Description

Technical Field

[0001] The present invention relates to the technical field of cable production, and in particular to an extrusion device and method for cable production. Background Art

[0002] Cables are an important part of modern power and communication systems, used to transmit electrical energy or signal information. In the cable production process, the coating of the insulation layer is one of the key links to ensure the safety, stability and service life of the cable. At present, the widely used cable extrusion equipment mainly uses high-temperature extrusion to evenly coat the insulating material on the outer surface of the conductor. However, under the existing technical conditions, traditional extrusion equipment has some shortcomings, especially the lack of design to enhance the friction between the insulation layer and the conductor during the coating process, which affects the stability of the cable structure during subsequent use.

[0003] Specifically, the outer surface of existing conductors mostly adopts a smooth design, and the insulation layer is tightly wrapped around the outer surface of the conductor during extrusion. However, due to the insufficient friction between the conductor and the insulation layer, relative slippage between the insulation layer and the conductor is likely to occur during the laying or pulling of the cable. The insulation layer may shift position or even slip under the action of external force. This relative displacement phenomenon is more significant when the cable is laid over long distances or installed in complex environments. Due to the lack of support from the conductor, the insulation layer is very likely to be stretched, deformed or torn when subjected to force alone, which in turn affects the integrity of the cable, ultimately resulting in a decrease in the performance of the cable, and may even cause damage to the cable, affecting the safety and reliability of power or signal transmission.

[0004] Therefore, how to effectively increase the friction between the conductor and the insulation layer during the cable extrusion process, ensure that the insulation layer can be firmly covered on the outer surface of the conductor, and avoid relative displacement between the insulation layer and the conductor has become a core issue that needs to be urgently solved in the current cable production extrusion equipment technology. Summary of the invention

[0005] In view of this, the present invention proposes an extrusion device and method for cable production, which effectively increases the friction between the conductor and the insulation layer during the cable extrusion process, ensuring that the insulation layer can be firmly coated on the outer surface of the conductor.

[0006] The technical solution of the present invention is achieved in this way:

[0007] In one aspect, the present invention provides an extrusion device for cable production, comprising a frame and an extrusion die mounted on the frame, and also comprising a conductor tube and a wire core surface treatment device; wherein:

[0008] The wire tube is fixedly arranged horizontally on the frame and connected to the extrusion die to guide the wire core into the extrusion die;

[0009] The wire core surface treatment device includes an extrusion rod and a driving mechanism. There are multiple extrusion rods, which are evenly arranged around the central axis of the wire tube. One end of the extrusion rod is located in the wire tube and is provided with an embossed protrusion. The other end of the extrusion rod moves along the radial direction of the wire tube and passes through the outside of the wire tube. The driving mechanism is arranged on the outside of the wire tube and is connected to the end of the extrusion rod located on the outside of the wire tube. The driving mechanism is used to synchronously drive the multiple extrusion rods to reciprocate so that the embossed protrusions on the extrusion rods emboss the outer surface of the wire core.

[0010] On the basis of the above technical solution, preferably, the driving mechanism includes an annular member, an elastic member, an extrusion member and a power assembly;

[0011] The annular member is sleeved on the outside of the wire tube and is rotatably connected to the wire tube, and one end surface of the annular member is provided with a circular groove;

[0012] The number of the extrusion pieces is consistent with the number of the extrusion rods, and the multiple extrusion pieces are evenly arranged on the inner circumference of the circular groove, and the end surface of the extrusion piece is spherical;

[0013] A first extrusion portion with a spherical structure is fixedly provided at one end of the extrusion rod extending out of the outer side of the wire tube, and the first extrusion portion is located in the circular groove;

[0014] The elastic member is sleeved on the extrusion rod, one end of the elastic member abuts against the outer wall of the wire tube, and the other end abuts against the first extrusion portion;

[0015] The power assembly is arranged on the frame and is used for driving the annular member to rotate relative to the wire tube.

[0016] Further, preferably, the inner peripheral wall of the circular groove is provided with an annular groove, the extrusion piece is located in the annular groove, and at least a part of the first extrusion part can be accommodated in the annular groove;

[0017] The inner circumferential wall of the wire tube is fixedly provided with a guide sleeve, the extrusion rod movably passes through the guide sleeve, the outer circumferential wall of the extrusion rod is provided with a guide protrusion along its axial direction, and the inner circumferential wall of the guide sleeve is provided with a guide groove matched with the guide protrusion.

[0018] On the basis of the above technical solution, preferably, a threaded hole for installing an extrusion piece is opened on the outer peripheral surface of the annular member, and the threaded hole is connected to the annular groove. The extrusion piece includes a threaded portion and a second extrusion portion fixedly connected to the threaded portion, and the second extrusion portion is located in the annular groove, and the threaded portion is threadedly connected to the threaded hole.

[0019] On the basis of the above technical solution, preferably, the power assembly includes a servo motor, a reducer, a driving wheel, a driven wheel and a transmission member, the servo motor is fixedly arranged on the frame, the input shaft of the reducer is connected to the output shaft of the servo motor, the output shaft of the reducer is connected to the driving wheel, the driven wheel is fixedly arranged at one end of the annular member away from the circular groove, and the driven wheel and the driving wheel are connected through a transmission member.

[0020] On the basis of the above technical solution, preferably, it further comprises two sets of positioning mechanisms, which are respectively arranged on the wire tubes on both sides of the wire core surface treatment device, and are used to keep the wire core and the wire tube passing through the wire core surface treatment device coaxial;

[0021] The positioning mechanism includes a positioning rod and an adjusting device. There are multiple positioning rods, which are evenly arranged around the central axis of the wire tube. One end of the positioning rod is located in the wire tube and is used to contact the outer wall of the wire core. The other end moves along the radial direction of the wire tube and passes through the outside of the wire tube. The adjusting device is fixedly arranged on the outer peripheral side of the wire tube and is used to drive the multiple positioning rods to move horizontally synchronously to adjust the length of the multiple positioning rods extending into the wire tube.

[0022] Further, preferably, the adjustment device includes a first disc body, a second disc body, an annular gear disc, a rotating gear and a driving gear;

[0023] The first disk is coaxially fixedly arranged outside the wire tube, one end of the positioning rod located outside the wire tube is slidably connected to the first disk, and the side wall of the positioning rod is provided with teeth;

[0024] The number of rotating gears is consistent with the number of positioning rods, and the rotating gears are rotatably arranged on the first disk body, and are located on one side of the corresponding positioning rod and meshed with the teeth;

[0025] The annular gear plate is horizontally arranged above the positioning rod, and the inner teeth of the annular gear plate are meshed and connected with a plurality of rotating gears;

[0026] The second disk body is located above the annular gear disk and is fixedly connected to the wire tube. The driving gear is rotatably arranged between the first disk body and the second disk body, and the driving gear is meshed with the outer teeth of the annular gear disk. The central axis of the driving gear moves through the outside of the first disk body or the second disk body and is connected to an adjustment knob.

[0027] Furthermore, preferably, the positioning rod has a positioning block at one end located inside the wire tube, and the end of the positioning block is provided with a V-shaped groove connected to the outer peripheral wall of the wire core, and the positioning block is made of hard plastic material.

[0028] On the basis of the above technical solution, preferably, the extrusion mold includes an inner mold and an outer mold, the inner mold is sleeved in the outer mold and fixedly connected to the outer mold, the inner mold is fixedly connected to the outlet end of the wire pipe, an annular channel is provided between the inner mold and the outer mold, the annular channel is connected to the mold hole of the outer mold, an injection port connected to the annular channel is provided on the outer surface of the outer mold near one end of the wire pipe, the outer cone angle of the inner mold is smaller than the inner cone angle of the outer mold, a spiral guide plate is provided on the outer cone surface of the inner mold, and the outer surface of the spiral guide plate is connected to the inner cone surface of the outer mold.

[0029] In a second aspect, the present invention discloses a cable extrusion method, which utilizes the cable production extrusion device described in the first aspect, and comprises the following steps:

[0030] S1. Pass the wire core through the wire tube and extrusion die;

[0031] S2. Adjust the length of the plurality of positioning rods extending into the wire tube by means of the adjusting device, so that the plurality of positioning rods are enclosed to position the outer peripheral side of the wire core, and keep the wire core and the wire tube coaxial;

[0032] S3. During the horizontal transmission of the wire core, the driving mechanism drives the multiple extrusion rods to move back and forth synchronously, so that the embossed protrusions on the extrusion rods emboss the outer surface of the wire core;

[0033] S4. After the wire core is embossed in the wire tube, it enters the extrusion die to complete the insulation layer coating operation on the surface of the wire core.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) Through the synchronous control of the driving mechanism, multiple extrusion rods can move back and forth. The embossed protrusions of the extrusion rods emboss the outer surface of the wire, so that the surface of the wire core is no longer smooth, but has certain textures or roughness. After the embossing is formed, the wire core continues to enter the extrusion die. During this process, the insulating material is extruded and coated on the surface of the wire core with the embossing, which increases the contact area and friction coefficient between the wire core and the insulation layer, improves the adhesion between the insulation layer and the wire core, and makes the insulation layer more stable during the coating process and not easy to peel off or slide.

[0036] (2) The rotation of the annular member drives all the extrusion members to evenly apply pressure to all the extrusion rods, so that the depth of the embossing on the entire wire core surface is consistent, achieving a uniform embossing effect. The design of the first extrusion part and the spherical extrusion member of the spherical structure allows the two to fit closely during the rotation process. The spherical structure can adapt to the relative movement of the circular groove, ensuring a smooth transition of the extrusion member during the contact process with the first extrusion part, reducing the friction during the contact process. This spherical design effectively avoids the jamming phenomenon caused by sharp edges, making the extrusion process smoother, thereby improving the reliability and uniformity of the entire embossing process.

[0037] (3) An annular groove is provided on the inner peripheral wall of the circular groove, the extrusion piece is located in the annular groove, and at least a portion of the first extrusion part can be accommodated in the annular groove. In this way, the annular groove provides a limited rotation path for the first extrusion part, ensuring that it will not deviate during the rotation process. Even if a large stress occurs during the cooperation between the extrusion piece and the first extrusion part, the annular groove can effectively avoid the deflection problem caused by the stress, thereby ensuring the stability of the extrusion process.

[0038] (4) By opening a threaded hole for installing the extrusion part on the outer circumferential surface of the annular part, the second extrusion part can be protruded or retracted in the annular groove by rotating the threaded part, thereby adjusting the movement stroke of the extrusion rod during the extrusion process of the second extrusion part and the first extrusion part, so as to meet the requirements of embossing of different depths. The extrusion device is suitable for various embossing depth requirements, so as to flexibly adjust the surface roughness of the wire core and improve the wrapping bonding strength between the wire core and the insulation layer. This greatly increases the flexibility of the device during the production process and meets the requirements of different cable specifications.

[0039] (5) By setting up two sets of positioning mechanisms, the wire core can always maintain stable coaxiality with the wire tube when entering and leaving the wire core surface treatment device, thereby ensuring that when the wire core passes through the wire core surface treatment device, multiple extrusion rods can accurately apply uniform embossing to the outer peripheral surface of the wire core.

[0040] (6) By setting the adjustment device, the position of the positioning rod can be flexibly adjusted according to the diameter of the wire core, so that the inner diameter of the rotating body formed by the positioning rod can adapt to wire cores of different specifications, so that the same equipment can meet the production needs of wire cores of different diameters. This flexibility reduces the frequency of equipment replacement or adjustment, saves time and cost, and improves the versatility and adaptability of the equipment.

[0041] (7) The adjustment device achieves synchronous adjustment of multiple positioning rods through an ingenious gear transmission system, ensuring that the wire core remains coaxial in the wire tube, so that the wire core surface treatment device can accurately and stably emboss the wire core surface, improving the accuracy and stability of the wire core embossing operation. In addition, the structure of the adjustment device is stable, which reduces maintenance requirements, adapts to a variety of wire core diameters, and significantly improves the versatility and production efficiency of the extrusion device.

[0042] (8) By making the outer cone angle of the inner mold smaller than the inner cone angle of the outer mold, it is ensured that the pressure of the plastic material gradually increases during the process of flowing from the annular channel to the outer mold hole. This gradually increasing pressure helps the plastic to be more tightly wrapped on the surface of the wire core, thereby enhancing the fit between the wire core and the insulation layer; by setting a spiral guide plate on the outer cone surface of the inner mold, the spiral guide plate not only guides the plastic material to flow along the spiral path to the outer mold hole, but also further increases the pressure during the extrusion process. This not only accelerates the transmission speed of the plastic material, but also enables the plastic material to maintain sufficient pressure during the extrusion process. On the premise of embossing the surface of the wire core, the wrapping bonding force between the wire core and the insulation layer is improved, the relative slip between the insulation layer and the wire core is avoided or reduced, and the stability and reliability of the cable are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 It is a schematic diagram of the three-dimensional structure of the extrusion device for cable production disclosed in the present invention;

[0045] Figure 2 It is a schematic diagram of the assembly structure of the wire tube and the wire core surface treatment device of the present invention;

[0046] Figure 3 It is a schematic diagram of the three-dimensional structure of the wire core surface treatment device disclosed in the present invention;

[0047] Figure 4 It is a schematic diagram of the three-dimensional structure of the ring member disclosed in the present invention;

[0048] Figure 5 It is a three-dimensional structural schematic diagram of the extrusion rod and the extrusion piece disclosed in the present invention;

[0049] Figure 6 It is a schematic diagram of the assembly structure of the extruded rod and the wire tube disclosed in the present invention;

[0050] Figure 7 It is a schematic diagram of the assembly structure of the positioning mechanism and the wire tube disclosed in the present invention;

[0051] Figure 8 It is a three-dimensional structural schematic diagram of the positioning mechanism disclosed in the present invention;

[0052] Fig. 9 A top view of the extrusion device for cable production disclosed in the present invention;

[0053] Fig.10 for Fig. 9 Plane section view at AA in the middle;

[0054] Fig.11 for Fig. 9 Plane section view at BB in the middle;

[0055] Fig.12 It is a schematic diagram of the three-dimensional structure of the extrusion die disclosed in the present invention;

[0056] Reference numerals:

[0057] P, wire core; 1, frame; 2, extrusion die; 3, wire tube; 4, wire core surface treatment device; 41, extrusion rod; 410, embossed protrusion; 42, driving mechanism; 421, annular member; 422, elastic member; 423, extrusion member; 424, power assembly; 4211, circular groove; 411, first extrusion part; 4212, annular groove; 31, guide sleeve; 412, guide protrusion; 311, guide groove; 4213, threaded hole; 4231, threaded part; 4232, second extrusion part; 4241, Servo motor; 4242, reducer; 4243, driving wheel; 4244, driven wheel; 4245, transmission member; 5, positioning mechanism; 51, positioning rod; 52, adjusting device; 521, first disk body; 522, second disk body; 523, annular gear plate; 524, rotating gear; 525, driving gear; 511, teeth; 5251, adjusting knob; 512, positioning block; 5121, V-groove; 21, inner mold; 22, outer mold; 23, annular channel; 221, injection port; 211, spiral guide plate. DETAILED DESCRIPTION

[0058] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] like Figure 1 As shown, combined Figure 2 and 3 The embodiment of the present invention discloses an extrusion device for cable production, including a frame 1 and an extrusion die 2 installed on the frame 1, the frame 1 is a supporting structure of the whole device, and the extrusion die 2 is used to extrude and coat the insulating material on the outer surface of the conductor.

[0060] The cable production extrusion device disclosed in this embodiment also includes a conductor tube 3 and a wire core P surface treatment device.

[0061] The wire tube 3 is fixed horizontally on the frame 1 to guide the wire core P into the extrusion die 2, ensuring that the wire core P passes stably through the entire extrusion process.

[0062] The wire core surface treatment device 4 is used to treat the surface of the wire core P before the wire core P enters the extrusion die 2. Specifically, the wire core surface treatment device 4 includes an extrusion rod 41 and a driving mechanism 42. There are multiple extrusion rods 41, and the multiple extrusion rods 41 are evenly arranged around the central axis of the wire tube 3. One end of the extrusion rod 41 is located in the wire tube 3 and is provided with an embossed protrusion 410. The other end of the extrusion rod 41 moves along the radial direction of the wire tube 3 through the outside of the wire tube 3. The driving mechanism 42 is arranged on the outside of the wire tube 3 and is connected to the end of the extrusion rod 41 located on the outside of the wire tube 3. The driving mechanism 42 is used to synchronously drive the multiple extrusion rods 41 to move back and forth, so that the embossed protrusion 410 on the extrusion rod 41 applies embossing to the outer surface of the wire core P.

[0063] In this embodiment, when the wire core P passes through the wire tube 3, the multiple extrusion rods 41 are able to move back and forth through the synchronous control of the driving mechanism 42. The embossed protrusions 410 of the extrusion rods 41 apply embossing to the outer surface of the wire, so that the surface of the wire core P is no longer smooth, but has certain textures or roughness. After the embossing is formed, the wire core P continues to enter the extrusion die 2. During this process, the insulating material is extruded and coated on the surface of the wire core P with the embossing, which increases the contact area and friction coefficient between the wire core P and the insulation layer, improves the adhesion between the insulation layer and the wire core, and makes the insulation layer more stable during the coating process, not easy to peel off or slide, especially during the long-distance laying of the cable or the pulling process in a complex environment, which improves the stability of the insulation layer.

[0064] By adding embossing to the surface of the wire core P, not only the friction is increased, but also a physical interlocking effect may be formed, so that the insulation layer is more firmly fixed to the surface of the wire core P. This interlocking effect can effectively reduce the relative displacement of the insulation layer and reduce the risk of deformation or rupture of the insulation layer due to sliding or external force, thereby enhancing the structural integrity of the cable.

[0065] In addition, through the synchronous control of the extrusion rod 41 and the driving mechanism 42, the surface treatment process can be automated to ensure that the surface texture of each section of the wire core P is consistent, thereby improving production efficiency and product consistency.

[0066] In order to realize that the driving mechanism 42 synchronously drives the multiple extrusion rods 41 to reciprocate, this embodiment shows a preferred structural mode of the driving mechanism 42. Figure 2-5 As shown, the driving mechanism 42 includes an annular member 421 , an elastic member 422 , an extruding member 423 and a power assembly 424 .

[0067] The ring member 421 is sleeved on the outside of the wire tube 3 and is rotatably connected to the wire tube 3. A circular groove 4211 is provided on one end face of the ring member 421. The number of extrusion members 423 is consistent with the number of extrusion rods 41. Multiple extrusion members 423 are evenly arranged on the inner circumference of the circular groove 4211. The end face of the extrusion member 423 is spherical. The end of the extrusion rod 41 extending out of the outside of the wire tube 3 is fixedly provided with a first extrusion portion 411 of a spherical structure. The first extrusion portion 411 is located in the circular groove 4211. The setting of the circular groove 4211 provides a mounting base for the extrusion member 423 on the one hand, and provides a space for the extrusion rod 41 and the extrusion member 423 to cooperate with each other. The elastic member 422 is sleeved on the extrusion rod 41. One end of the elastic member 422 abuts against the outer wall of the wire tube 3, and the other end abuts against the first extrusion portion 411, ensuring that the extrusion rod 41 can return to the initial position after each extrusion to maintain a stable embossing effect. The power assembly 424 is disposed on the frame 1 and is used to drive the annular member 421 to rotate relative to the wire tube 3 .

[0068] In the initial state, the elastic member 422 applies a force to the first extrusion part 411, so that the first extrusion part 411 maintains close contact with the inner wall of the circular groove 4211. This close contact state provides a preloaded elastic force for the entire embossing process, making the extrusion process smooth and avoiding looseness. When the power component 424 drives the annular member 421 to rotate around the wire tube 3, the annular member 421 rotates relative to the multiple extrusion rods 41, so that the first extrusion parts 411 on the multiple extrusion rods 41 rotate relatively on the inner wall of the circular groove 4211. During the rotation process, the spherical extrusion part 423 gradually contacts the first extrusion part 411 and applies downward pressure to it. This pressure is smoothly transitioned by the spherical extrusion part 423, so that the first extrusion part 411 and the extrusion rod 41 move downward, thereby forming embossing on the surface of the wire. At the moment when the extrusion member 423 passes over the first extrusion portion 411, due to the reset effect of the elastic member 422, the first extrusion portion 411 can quickly return to the initial position, that is, contact with the inner wall of the circular groove 4211, preparing for the next extrusion. This reciprocating motion forms a stable embossing treatment on the surface of the wire core P.

[0069] The rotation of the annular member 421 drives all the extrusion members 423 to uniformly apply pressure to all the extrusion rods 41, so that the depth of the embossing on the surface of the entire wire core P is consistent, achieving a uniform embossing effect. The design of the first extrusion part 411 and the spherical extrusion member 423 of the spherical structure allows the two to fit closely during the rotation process. The spherical structure can adapt to the relative movement of the circular groove 4211, ensuring that the extrusion member 423 smoothly transitions during the contact process with the first extrusion part 411, reducing the friction during the contact process. This spherical design effectively avoids the jamming phenomenon caused by sharp edges, making the extrusion process smoother, thereby improving the reliability and uniformity of the entire embossing process.

[0070] The design of the spherical extrusion piece 423 and the first extrusion part 411 ensures that the pressure applied each time is uniform, so that the embossing depth and width on the surface of the conductor remain consistent. The uniform embossing structure increases the friction between the conductor and the insulation layer, helps the insulation layer remain stable in complex environments, and improves the overall reliability of the cable.

[0071] Since the first extrusion portion 411 and the extrusion piece 423 are spherically matched, and the ring member 421 is continuously rotating, when the extrusion piece 423 and the first extrusion portion 411 obtain extrusion force in the vertical direction, the extrusion piece 423 will instantly pass over the first extrusion portion 411, so that the extrusion rod 41 can instantly apply embossing to the surface of the wire core P without affecting the horizontal transportation of the wire core P, ensuring that the wire core P can be conveyed during the transportation process. The extrusion rod 41 intermittently applies embossing to the surface of the wire core P, and the spacing between two adjacent embossings in the axial direction of the wire core P can be adjusted by controlling the rotation speed of the ring member 421.

[0072] It is worth noting that the first extrusion portion 411 is in direct contact with the inner wall of the circular groove 4211. Since the inner wall of the circular groove 4211 is smooth, there is a large uncertainty in the spherical structure of the first extrusion portion 411 when it is extruded in cooperation with the extrusion piece 423. Specifically, when the first extrusion portion 411 is extruded in cooperation with the spherical structure of the extrusion piece 423, at the moment when the extrusion piece 423 passes over the first extrusion portion 411, the contact between the spherical surfaces may cause stress concentration, which may affect the stability of the cooperation and may cause extrusion deviation, thereby making it impossible to ensure uniform distribution of force during the extrusion process.

[0073] For this purpose, refer to the attached Figure 3 , 4 As shown in FIG. 10 , the scheme of this embodiment is as follows: an annular groove 4212 is provided on the inner peripheral wall of the circular groove 4211, the extrusion piece 423 is located in the annular groove 4212, and at least a part of the first extrusion part 411 can be accommodated in the annular groove 4212. Thus, the annular groove 4212 provides a limited rotation path for the first extrusion part 411, ensuring that it will not deviate during the rotation process. Even if a large stress occurs during the cooperation process between the extrusion piece 423 and the first extrusion part 411, the annular groove 4212 can effectively avoid the deflection problem caused by the stress, thereby ensuring the stability of the extrusion process.

[0074] In this embodiment, in order to ensure that the reciprocating movement of the extrusion rod 41 is smoother, the extrusion rod 41 is configured as a cylindrical structure. Since the extrusion rod 41 will rotate circumferentially relative to the wire tube 3 during the reciprocating movement, the embossed pattern applied by the extrusion rod 41 to the wire core P changes, resulting in uneven multiple embossings at the same cross-section on the wire core P.

[0075] For this purpose, refer to the attached Figure 5 and 6 As shown, the solution adopted in this embodiment is to fix a guide sleeve 31 on the inner circumferential wall of the wire tube 3. The setting of the guide sleeve 31 provides a guide path for the extrusion rod 41, so that it maintains stability in the axial direction during reciprocating motion. The extrusion rod 41 moves through the guide sleeve 31, and the outer circumferential wall of the extrusion rod 41 is provided with a guide protrusion 412 along its axial direction, and the inner circumferential wall of the guide sleeve 31 is provided with a guide groove 311 that matches the guide protrusion 412. Through the cooperation of the guide groove 311 and the wire protrusion, the extrusion rod 41 can only move axially, avoiding circumferential movement, thereby ensuring the consistency of all embossing.

[0076] In order to adapt to the adjustment of different embossing depths, this embodiment also provides the following technical solutions, see the attached Figure 3 , 5 As shown in Figure 10, specifically, the outer circumferential surface of the annular member 421 is provided with a threaded hole 4213 for mounting the extrusion member 423, and the threaded hole 4213 is connected to the annular groove 4212, so that the extrusion member 423 can be mounted on the annular member 421 through the threaded hole 4213. The setting of the threaded hole 4213 allows the extrusion member 423 to be rotated and adjusted along the axial direction of the annular member 421, thereby controlling the protruding length of the extrusion member 423 in the annular groove 4212.

[0077] The extrusion member 423 includes a threaded portion 4231 and a second extrusion portion 4232 fixedly connected to the threaded portion 4231. The second extrusion portion 4232 is a spherical structure. The second extrusion portion 4232 is located in the annular groove 4212. The threaded portion 4231 is threadedly connected to the threaded hole 4213. By rotating the threaded portion 4231, the second extrusion portion 4232 can be protruded or retracted in the annular groove 4212, thereby adjusting the movement stroke of the extrusion rod 41 during the extrusion process of the second extrusion portion 4232 and the first extrusion portion 411, so as to adapt to the embossing requirements of different depths. The extrusion device is suitable for various embossing depth requirements, thereby flexibly adjusting the surface roughness of the wire core P and improving the wrapping bonding strength between the wire core P and the insulation layer. This greatly increases the flexibility of the device during the production process and meets the requirements of different cable specifications.

[0078] When the diameter of the cable core P changes, the length of the extrusion piece 423 can be adjusted by rotating the threaded portion 4231 to adapt it to the core P of different diameters. The adjustable extrusion piece 423 structure allows the operator to quickly adjust the extension length of the extrusion piece 423 according to the change in the diameter of the core P without replacing parts. This not only improves production efficiency, but also saves adjustment time and cost.

[0079] Due to the cooperation between the threaded portion 4231 and the threaded hole 4213, it is very simple to adjust the position of the extrusion piece 423. The depth of the embossing can be adjusted by simply rotating the threaded portion 4231. The operation is convenient and no additional tools are required, which facilitates quick adjustment.

[0080] This embodiment shows a preferred structural mode of the power assembly 424. For details, refer to the attached Figure 2 As shown, the power assembly 424 includes a servo motor 4241, a reducer 4242, a driving wheel 4243, a driven wheel 4244 and a transmission member 4245, wherein the servo motor 4241 is fixedly arranged on the frame 1, the input shaft of the reducer 4242 is connected to the output shaft of the servo motor 4241, and the output shaft of the reducer 4242 is connected to the driving wheel 4243, and the servo motor 4241 can accurately adjust its rotation speed and angle through a control signal, thereby realizing accurate control of the rotation of the ring member 421. The reducer 4242 can provide a lower rotation speed to meet the rotation requirements of the ring member 421. The driven wheel 4244 is fixedly arranged at one end of the ring member 421 away from the circular groove 4211, and the driven wheel 4244 is connected to the driving wheel 4243 through a transmission member 4245.

[0081] The ring member 421 can be rotated relative to the wire tube 3 through the transmission connection of the servo motor 4241, the reducer 4242, the driving wheel 4243 and the driven wheel 4244. This rotation drives the multiple extrusion members 423 in the ring member 421 to rotate synchronously along the circular groove 4211, thereby realizing continuous embossing treatment on the outer surface of the wire core P. Since the ring member 421 drives the extrusion member 423 to rotate, the spherical end surface of the extrusion member 423 always maintains a matching contact with the first extrusion portion 411 on the extrusion rod 41. Through the rotation of the ring member 421, the multiple extrusion members 423 can act synchronously on the outer surface of the wire core P, thereby forming a uniform embossing effect.

[0082] The power assembly 424 can accurately control the rotation speed and angle of the ring 421 through the cooperation of the servo motor 4241 and the reducer 4242, thereby achieving high-precision control of the embossing depth and embossing shape. This precise control capability makes the embossing effect more consistent during the cable production process. By controlling the rotation speed of the ring 421, the spacing between two adjacent embossings in the axial direction of the core P can be controlled, so that uniform and consistent embossing is obtained in the axial direction of the core P, and it can be avoided that the speed is too fast, resulting in overlapping embossings and damage to the surface of the core P.

[0083] Since the wire core P is not rigid enough and has a certain degree of flexibility, when passing through the wire tube 3 and entering the extrusion die 2, the wire core P is easily offset and shaken due to inertia or vibration, resulting in the wire core P not being able to always remain coaxial with the wire tube 3. This makes it impossible for the wire core surface treatment device 4 to accurately apply embossing on the surface of the wire core P during operation, which will cause the embossing on the surface of the wire core P to be misplaced and the embossing depth to be uneven.

[0084] To this end, the solution adopted in this embodiment is to refer to the attached Figure 7 , 9 As shown in Figures 1 and 11, two sets of positioning mechanisms 5 are also provided, and the two sets of positioning mechanisms 5 are respectively provided on the wire tubes 3 on both sides of the wire core surface treatment device 4, and are used to keep the wire core P passing through the wire core surface treatment device 4 and the wire tube 3 coaxial. In this way, the wire core P can always maintain stable coaxiality with the wire tube 3 when entering and leaving the wire core surface treatment device 4, so as to ensure that when the wire core P passes through the wire core surface treatment device 4, the multiple extrusion rods 41 can accurately apply uniform embossing on the outer peripheral surface of the wire core P.

[0085] For details, please refer to the attached Figure 8 As shown, the positioning mechanism 5 of this embodiment includes a positioning rod 51 and an adjusting device 52. A plurality of positioning rods 51 are provided, and the plurality of positioning rods 51 are evenly arranged around the central axis of the wire tube 3. One end of the positioning rod 51 is located in the wire tube 3 for contacting the outer wall of the wire core P, and the other end is movable along the radial direction of the wire tube 3 through the outer side of the wire tube 3 for connection with the adjusting device 52. The adjusting device 52 is fixedly provided on the outer peripheral side of the wire tube 3, and is used to drive the plurality of positioning rods 51 to move horizontally synchronously to adjust the length of the plurality of positioning rods 51 extending into the wire tube 3.

[0086] When the wire core P is about to enter the wire tube 3, the adjustment device 52 shortens the extension length of the multiple positioning rods 51 to ensure that the wire core P can smoothly enter the wire tube 3 without being blocked. After the wire core P passes through the wire tube 3 and enters the extrusion die 2, the adjustment device 52 drives the multiple positioning rods 51 to move horizontally synchronously, increasing the extension length of the positioning rods 51 in the wire tube 3, so that the positioning rods 51 surround the outer periphery of the wire core P and contact its surface. In this way, the positioning rods 51 can effectively support the wire core P and keep the wire core P in a coaxial state in the wire tube 3. Since the positioning mechanisms 5 are set on both sides of the wire core surface treatment device 4, the wire core P can have two positioning points in the axial direction, so that the wire core P can be coaxially straightened, ensuring that the wire core surface treatment device 4 between the two positioning mechanisms 5 can accurately and stably perform embossing operations on the surface of the wire core P.

[0087] In addition, it is worth noting that, by setting the adjustment device 52, the position of the positioning rod 51 can be flexibly adjusted according to the diameter of the wire core P, so that the inner diameter of the rotating body formed by the positioning rod 51 can adapt to wire cores P of different specifications, so that the same equipment can meet the production needs of wire cores P of different diameters. This flexibility reduces the frequency of equipment replacement or adjustment, saves time and cost, and improves the versatility and adaptability of the equipment.

[0088] This embodiment shows a preferred structural mode of the adjustment device 52. For details, refer to the attached Figure 8 As shown, the adjusting device 52 includes a first disc body 521 , a second disc body 522 , an annular gear disc 523 , a rotating gear 524 and a driving gear 525 .

[0089] The first disk 521 is coaxially fixedly disposed on the outside of the wire tube 3 to provide support and fixation for the entire adjustment device 52 .

[0090] One end of the positioning rod 51 is located in the wire tube 3, and the other end horizontally passes through the outside of the wire tube 3 and is slidably connected to the first disk 521, so that the positioning rod 51 can slide on the first disk 521, thereby adjusting its insertion length in the wire tube 3.

[0091] The side wall of the positioning rod 51 is provided with teeth 511, and the number of the rotating gears 524 is the same as the number of the positioning rods 51. The rotating gears 524 are rotatably provided on the first plate 521, and are located on one side of the corresponding positioning rod 51 and meshed with the teeth 511. The rotation of the rotating gears 524 can drive the positioning rod 51 to slide on the first plate 521, thereby adjusting the insertion length of the positioning rod 51.

[0092] The annular gear disc 523 is horizontally arranged above the positioning rod 51, and the inner teeth of the annular gear disc 523 are meshed and connected with multiple rotating gears 524; the inner teeth of the annular gear disc 523 are meshed and connected with multiple rotating gears 524, achieving the effect of one driving source driving multiple positioning rods 51 to move synchronously.

[0093] The second disk body 522 is located above the annular toothed disk 523 and is fixedly connected to the wire tube 3. The driving gear 525 is rotatably arranged between the first disk body 521 and the second disk body 522, and the driving gear 525 is meshed with the outer teeth of the annular toothed disk 523. The central axis of the driving gear 525 can move through the outside of the first disk body 521 or the second disk body 522 and is connected to an adjusting knob 5251.

[0094] The driving gear 525 is driven to rotate by adjusting the knob 5251, and then the multiple rotating gears 524 are driven to rotate synchronously through the annular gear plate 523, so that all the positioning rods 51 can be extended and retracted synchronously. This structure ensures that all the positioning rods 51 can be extended or retracted in the wire tube 3 at the same pace, realizing the coaxial positioning of the wire core P, and preventing the problem of shaking or deviation of the wire core P due to the asynchronous positioning rods 51.

[0095] In this embodiment, the adjustment rotation may be a hexagonal knob, or may be other forms of rotation adjustment structures.

[0096] The annular toothed disc 523 meshes with the rotating gear 524 and the driving gear 525 through internal and external teeth, so that the entire adjusting device 52 forms a tight mechanical transmission chain. This structure has high stability, can reduce the problem of loosening of the positioning rod 51 caused by vibration or other factors, reduce maintenance requirements, and improve the reliability of the device.

[0097] The teeth 511 on the side wall of the positioning rod 51 mesh with the rotating gear 524, so that the movement of the positioning rod 51 can be precisely controlled. The driving force provided by the adjustment knob 5251 can achieve small-scale precise adjustment of the positioning rod 51 through the gear transmission structure, so as to meet the requirements of wire cores P with different diameters.

[0098] The adjusting device 52 realizes the synchronous adjustment of multiple positioning rods 51 through a clever gear transmission system, ensuring that the wire core P remains coaxial in the wire tube 3, so that the wire core surface treatment device 4 can accurately and stably perform embossing operations on the surface of the wire core P, thereby improving the accuracy and stability of the embossing operation of the wire core P. In addition, the adjusting device 52 has a stable structure, reduces maintenance requirements, adapts to a variety of wire core P diameters, and significantly improves the versatility and production efficiency of the extrusion device.

[0099] As some preferred embodiments, the positioning rod 51 has a positioning block 512 at one end located inside the wire tube 3, and the end of the positioning block 512 is provided with a V-shaped groove 5121 connected to the outer peripheral wall of the wire core P, and the positioning block 512 is made of hard plastic.

[0100] The V-groove 5121 on the positioning block 512 can reliably contact the outer wall of the wire core P, provide support and ensure the coaxiality of the wire core P in the wire tube 3, thereby improving the stability of the wire core P during the extrusion process. The positioning block 512 is made of hard plastic material, which not only ensures sufficient hardness and wear resistance, but also avoids scratches or wear on the wire core P caused by metal materials, thereby extending the service life of the equipment and the wire core P.

[0101] Refer to the attached Fig.11 and 12As shown, the extrusion mold 2 disclosed in this embodiment includes an inner mold 21 and an outer mold 22, the inner mold 21 is sleeved in the outer mold 22 and fixedly connected to the outer mold 22, the inner mold 21 is fixedly connected to the outlet end of the wire tube 3, an annular channel 23 is provided between the inner mold 21 and the outer mold 22, the annular channel 23 is connected to the mold hole of the outer mold 22, and an injection port 221 connected to the annular channel 23 is provided on the outer surface of the outer mold 22 near the end of the wire tube 3 for connecting to the injection molding machine, the outer cone angle of the inner mold 21 is smaller than the inner cone angle of the outer mold 22, and a spiral guide plate 211 is provided on the outer cone surface of the inner mold 21, and the outer surface of the spiral guide plate 211 is connected to the inner cone surface of the outer mold 22.

[0102] By adopting the above technical solution, the outer cone angle of the inner mold 21 is smaller than the inner cone angle of the outer mold 22. This structural setting ensures that the pressure of the plastic material gradually increases during the process of flowing from the annular channel 23 to the die hole of the outer mold 22. This gradually increasing pressure helps the plastic to be more tightly wrapped on the surface of the wire core P, and enhances the fit between the wire core P and the insulation layer; the spiral guide plate 211 arranged on the outer cone surface of the inner mold 21 not only guides the plastic material to flow along the spiral path to the die hole of the outer mold 22, but also further increases the pressure during the extrusion process. This not only accelerates the transmission speed of the plastic material, but also enables the plastic material to maintain sufficient pressure during the extrusion process. On the premise of embossing the surface of the wire core P, the wrapping bonding force between the wire core P and the insulation layer is improved, the relative slip between the insulation layer and the wire core P is avoided or reduced, and the stability and reliability of the cable are improved.

[0103] The present invention also discloses a cable extrusion method, which utilizes the cable production extrusion device disclosed in the above embodiment, and comprises the following steps:

[0104] S1, pass the wire core P through the wire tube 3 and the extrusion die 2;

[0105] S2. Adjust the length of the multiple positioning rods 51 extending into the wire tube through the adjustment device 52, so that the multiple positioning rods 51 are enclosed to position the outer peripheral side of the wire core P, and keep the wire core P coaxial with the wire tube 3; this step ensures that the wire core P remains in the center position during the entire transmission and processing process to prevent deviation, laying the foundation for the accuracy of subsequent processes.

[0106] S3. During the horizontal transmission of the wire core P, the driving mechanism 42 drives the multiple extrusion rods 41 to move back and forth synchronously, so that the embossed protrusions 410 on the extrusion rods 41 emboss the outer surface of the wire core P; the embossing treatment not only increases the friction on the surface of the wire core P, but also improves the adhesion between the insulation layer and the wire core P, making the insulation layer more stable during the coating process and not easy to peel off or slide.

[0107] S4. After the wire core P is embossed in the wire tube 3, it enters the extrusion die 2 to complete the coating of the insulation layer on the surface of the wire core P. Since the wire core P has been positioned and embossed, the insulation layer can fit closely to the surface of the wire core P, thereby improving the insulation effect and overall mechanical strength of the finished product, and ensuring the safety and durability of the cable in use.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An extrusion device for cable production, comprising a frame (1) and an extrusion die (2) mounted on the frame (1), characterized in that: It also includes a wire tube (3) and a wire core surface treatment device (4); wherein, The wire tube (3) is fixedly arranged horizontally on the frame (1) and connected to the extrusion die (2) for guiding the wire core (P) into the extrusion die (2); The wire core surface treatment device (4) comprises an extrusion rod (41) and a driving mechanism (42). The extrusion rod (41) is provided in plurality and the plurality of extrusion rods (41) are evenly arranged around the central axis of the wire tube (3). One end of the extrusion rod (41) is located in the wire tube (3) and is provided with an embossed protrusion (410). The other end of the extrusion rod (41) moves along the radial direction of the wire tube (3) and passes through the outside of the wire tube (3). The driving mechanism (42) is provided on the outside of the wire tube (3) and is connected to one end of the extrusion rod (41) located on the outside of the wire tube (3). The driving mechanism (42) is used for synchronously driving the plurality of extrusion rods (41) to reciprocate so that the embossed protrusion (410) on the extrusion rod (41) applies embossing to the outer surface of the wire core (P).

2. The extrusion device for cable production according to claim 1, characterized in that: The driving mechanism (42) comprises an annular member (421), an elastic member (422), an extrusion member (423) and a power assembly (424); The annular member (421) is sleeved on the outside of the wire tube (3) and is rotatably connected to the wire tube (3), and one end surface of the annular member (421) is provided with a circular groove (4211); The number of the extrusion pieces (423) is consistent with the number of the extrusion rods (41), and the plurality of extrusion pieces (423) are evenly arranged on the inner circumference of the circular groove (4211), and the end faces of the extrusion pieces (423) are spherical; A first squeezing portion (411) with a spherical structure is fixedly provided at one end of the squeezing rod (41) extending out of the outside of the wire tube (3), and the first squeezing portion (411) is located in the circular groove (4211); The elastic member (422) is sleeved on the extrusion rod (41), one end of the elastic member (422) is in contact with the outer wall of the wire tube (3), and the other end is in contact with the first extrusion portion (411); The power assembly (424) is arranged on the frame (1) and is used to drive the annular member (421) to rotate relative to the wire tube (3).

3. The extrusion device for cable production according to claim 2, characterized in that: The inner peripheral wall of the circular groove (4211) is provided with an annular groove (4212), the extrusion piece (423) is located in the annular groove (4212), and at least a part of the first extrusion part (411) can be accommodated in the annular groove (4212); A guide sleeve (31) is fixedly arranged on the inner peripheral wall of the wire tube (3), the extrusion rod (41) movably passes through the guide sleeve (31), the outer peripheral wall of the extrusion rod (41) is provided with a guide protrusion (412) along its axial direction, and the inner peripheral wall of the guide sleeve (31) is provided with a guide groove (311) matching with the guide protrusion (412).

4. The extrusion device for cable production according to claim 3, characterized in that: The outer circumferential surface of the annular member (421) is provided with a threaded hole (4213) for installing an extrusion member (423); the threaded hole (4213) is communicated with the annular groove (4212); the extrusion member (423) comprises a threaded portion (4231) and a second extrusion portion (4232) fixedly connected to the threaded portion (4231); the second extrusion portion (4232) is a spherical structure; the second extrusion portion (4232) is located in the annular groove (4212); the threaded portion (4231) is threadedly connected to the threaded hole (4213).

5. The extrusion device for cable production according to claim 2, characterized in that: The power assembly (424) comprises a servo motor (4241), a reducer (4242), a driving wheel (4243), a driven wheel (4244) and a transmission member (4245); the servo motor (4241) is fixedly arranged on the frame (1); the input shaft of the reducer (4242) is connected to the output shaft of the servo motor (4241); the output shaft of the reducer (4242) is connected to the driving wheel (4243); the driven wheel (4244) is fixedly arranged on one end of the annular member (421) away from the circular groove (4211); and the driven wheel (4244) and the driving wheel (4243) are connected in transmission via the transmission member (4245).

6. The extrusion device for cable production according to claim 1, characterized in that: It also includes two sets of positioning mechanisms (5), which are respectively arranged on the wire tubes (3) on both sides of the wire core surface treatment device (4) and are used to keep the wire core (P) passing through the wire core surface treatment device (4) and the wire tube (3) coaxial; The positioning mechanism (5) comprises a positioning rod (51) and an adjusting device (52). A plurality of positioning rods (51) are provided. The plurality of positioning rods (51) are evenly arranged around the central axis of the wire tube (3). One end of the positioning rod (51) is located inside the wire tube (3) and is used to contact the outer wall of the wire core (P). The other end of the positioning rod (51) moves along the radial direction of the wire tube (3) and passes through the outside of the wire tube (3). The adjusting device (52) is fixedly provided on the outer peripheral side of the wire tube (3) and is used to drive the plurality of positioning rods (51) to move synchronously horizontally so as to adjust the length of the plurality of positioning rods (51) extending into the wire tube (3).

7. The extrusion device for cable production according to claim 6, characterized in that: The adjusting device (52) comprises a first disc body (521), a second disc body (522), an annular gear disc (523), a rotating gear (524) and a driving gear (525); The first disk (521) is coaxially fixedly arranged outside the wire tube (3), one end of the positioning rod (51) located outside the wire tube (3) is slidably connected to the first disk (521), and the side wall of the positioning rod (51) is provided with teeth (511); The number of rotating gears (524) is the same as the number of positioning rods (51), and the rotating gears (524) are rotatably disposed on the first disk body (521), and are located on one side of the corresponding positioning rod (51) and meshed with the teeth (511); The annular toothed disc (523) is horizontally arranged above the positioning rod (51), and the inner teeth of the annular toothed disc (523) are meshedly connected with a plurality of rotating gears (524); The second disk (522) is located above the annular toothed disk (523) and is fixedly connected to the wire tube (3). The driving gear (525) is rotatably arranged between the first disk (521) and the second disk (522), and the driving gear (525) is meshed with the outer teeth of the annular toothed disk (523). The central axis of the driving gear (525) moves through the outside of the first disk (521) or the second disk (522) and is connected to an adjusting knob (5251).

8. The extrusion device for cable production according to claim 6, characterized in that: The positioning rod (51) has a positioning block (512) at one end located inside the wire tube (3), and a V-shaped groove (5121) connected to the outer peripheral wall of the wire core (P) is provided at the end of the positioning block (512), and the positioning block (512) is made of hard plastic material.

9. The extrusion device for cable production according to claim 1, characterized in that: The extrusion die (2) comprises an inner die (21) and an outer die (22); the inner die (21) is sleeved in the outer die (22) and fixedly connected to the outer die (22); the inner die (21) is fixedly connected to the outlet end of the wire tube (3); an annular channel (23) is provided between the inner die (21) and the outer die (22); the annular channel (23) is connected to the die hole of the outer die (22); an injection port (221) connected to the annular channel (23) is provided at one end of the outer surface of the outer die (22) close to the wire tube (3); the outer cone angle of the inner die (21) is smaller than the inner cone angle of the outer die (22); a spiral guide plate (211) is provided on the outer cone surface of the inner die (21); the outer surface of the spiral guide plate (211) is connected to the inner cone surface of the outer die (22).

10. A cable extrusion method, using the cable production extrusion device according to any one of claims 6 to 9, characterized in that: The steps include: S1. Pass the wire core through the wire tube and extrusion die; S2. Adjust the length of the plurality of positioning rods extending into the wire tube by means of the adjusting device, so that the plurality of positioning rods are enclosed to position the outer peripheral side of the wire core, and keep the wire core and the wire tube coaxial; S3. During the horizontal transmission of the wire core, the driving mechanism drives the multiple extrusion rods to move back and forth synchronously, so that the embossed protrusions on the extrusion rods emboss the outer surface of the wire core; S4. After the wire core is embossed in the wire tube, it enters the extrusion die to complete the insulation layer coating operation on the surface of the wire core.

Images