Extrusion device and method for cable production

Abstract

The application provides an extrusion device and method for cable production, which comprises a rack, an extrusion die, a wire tube and a wire core surface treatment device; the wire tube is horizontally fixed on the rack and connected with the extrusion die, and is used for guiding the wire core into the extrusion die; the wire core surface treatment device comprises extrusion rods and a driving mechanism; a plurality of extrusion rods are arranged uniformly around the central axis of the wire tube; one end of each extrusion rod is located in the wire tube and is provided with a patterned convex; the other end of each extrusion rod moves through the outside of the wire tube along the radial direction of the wire tube; the driving mechanism is arranged outside the wire tube and is used for synchronously driving the plurality of extrusion rods to move back and forth, so that the patterned convexes exert patterns on the outer surface of the wire core. By exerting patterns on the surface of the wire core, the contact area and the friction coefficient between the wire core and the insulation layer are increased, the adhesion between the insulation layer and the wire core is improved, and the insulation layer is more stable during the coating process and is not easy to peel off or slide.

Description

Technical Field

[0001] This invention relates to the field of cable production technology, and in particular to an extrusion apparatus and method for cable production. Background Technology

[0002] Cables are a crucial component of modern power and communication systems, used to transmit electrical energy or signal information. In the cable manufacturing process, insulation coating is a critical step, ensuring the cable's safety, stability, and lifespan. Currently, widely used cable extrusion equipment primarily uses high-temperature extrusion to uniformly coat the insulation material onto the outer surface of the conductor. However, under current technological conditions, traditional extrusion equipment has some shortcomings, particularly the lack of design to enhance the friction between the insulation layer and the conductor during the coating process, which affects the cable's structural stability during subsequent use.

[0003] Specifically, existing conductors often feature a smooth outer surface, with the insulation layer tightly wrapped around the conductor during extrusion. However, due to insufficient friction between the conductor and the insulation layer, relative slippage can easily occur between them during cable laying or pulling. The insulation layer may shift position under external force, or even slip off. This relative displacement phenomenon is more pronounced during long-distance cable laying or installation in complex environments. Lacking conductor support, the insulation layer is highly susceptible to tensile deformation or cracking under individual stress, affecting the cable's integrity and ultimately leading to decreased cable performance or even cable damage, impacting 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 firmly cover the outer surface of the conductor, and avoid relative displacement between the insulation layer and the conductor, has become a core problem that current extrusion equipment technology for cable production urgently needs to solve. Summary of the Invention

[0005] In view of this, the present invention proposes an extrusion apparatus 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 firmly cover the outer surface of the conductor.

[0006] The technical solution of this invention is implemented as follows:

[0007] On one hand, the present invention provides an extrusion apparatus for cable production, including a frame and an extrusion die mounted on the frame, and further including a conductor tube and a conductor surface treatment device; wherein,

[0008] The conduit is horizontally fixed 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 comprises extrusion rods and a driving mechanism, the extrusion rods are provided in plurality, the plurality of extrusion rods are uniformly arranged around the center axis of the wire tube, one end of the extrusion rod is located in the wire tube and is provided with a embossing protrusion, the other end of the extrusion rod is movably arranged through the outside of the wire tube along the radial direction of the wire tube, the driving mechanism is arranged outside the wire tube and is connected with the one end of the extrusion rod outside the wire tube, the driving mechanism is used for synchronously driving the plurality of extrusion rods to reciprocate, so that the embossing protrusion on the extrusion rod applies embossing to the outer surface of the wire core.

[0010] On the basis of the above technical scheme, preferably, the driving mechanism comprises a ring member, an elastic member, an extrusion member and a power assembly.

[0011] The ring member is sleeved outside the wire tube and is rotationally connected with the wire tube, one end face of the ring member is provided with a circular groove;

[0012] The number of the extrusion members is consistent with the number of the extrusion rods, the plurality of extrusion members are uniformly arranged on the inner circumferential surface of the circular groove, and the end face of the extrusion member is in a spherical shape;

[0013] One end of the extrusion rod extending out of the wire tube is fixedly provided with a first extrusion part in a spherical structure, and the first extrusion part 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 part;

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

[0016] Further, preferably, the circular groove is provided with an annular groove, the extrusion member 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 the axial direction thereof, 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 scheme, preferably, the outer circumferential surface of the ring member is provided with a threaded hole for mounting the extrusion member, the threaded hole is in communication with the annular groove, the extrusion member comprises a threaded part and a second extrusion part fixedly connected with the threaded part, the second extrusion part is located in the annular groove, and the threaded part is threadedly connected with the threaded hole.

[0019] On the basis of the above technical scheme, preferably, the power assembly comprises a servo motor, a speed reducer, a driving wheel, a driven wheel and a transmission member, the servo motor is fixedly arranged on the rack, an input shaft of the speed reducer is connected with an output shaft of the servo motor, an output shaft of the speed reducer is connected with 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 is in transmission connection with the driving wheel through the transmission member.

[0020] On the basis of the above technical scheme, preferably, the power assembly comprises a servo motor, a speed reducer, a driving wheel, a driven wheel and a transmission member, the servo motor is fixedly arranged on the rack, an input shaft of the speed reducer is connected with an output shaft of the servo motor, an output shaft of the speed reducer is connected with 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 is in transmission connection with the driving wheel through the transmission member.

[0021] The positioning mechanism comprises positioning rods and an adjusting device, the positioning rods are arranged in multiple, the multiple positioning rods are uniformly arranged around the central axis of the wire tube, one end of the positioning rod is located in the wire tube and used for contacting the outer sidewall of the wire core, the other end of the positioning rod is movably arranged through the outer side of the wire tube in the radial direction of the wire tube, and the adjusting device is fixedly arranged on the outer circumferential side of the wire tube and used for driving the multiple positioning rods to move horizontally synchronously so as to adjust the length of the multiple positioning rods extending into the wire tube.

[0022] Further, preferably, the adjusting device comprises a first disc body, a second disc body, an annular gear disc, a rotating gear and a driving gear.

[0023] The first disc body is coaxially fixedly arranged on the outer side of the wire tube, one end of the positioning rod located on the outer side of the wire tube is in sliding connection with the first disc body, and a tooth is arranged on the sidewall of the positioning rod.

[0024] The rotating gears are arranged in the same number as the positioning rods, the rotating gears are rotatably arranged on the first disc body and located on the side of the corresponding positioning rods and in meshing connection with the teeth.

[0025] The annular gear disc is horizontally arranged above the positioning rods, and the inner teeth of the annular gear disc are in meshing connection with the multiple rotating gears.

[0026] The second disc body is located above the annular gear disc and fixedly connected with the wire tube, the driving gear is rotatably arranged between the first disc body and the second disc body, the driving gear is in meshing connection with the outer teeth of the annular gear disc, and the central shaft of the driving gear movably penetrates through the outer side of the first disc body or the second disc body and is connected with an adjusting knob.

[0027] Further, preferably, one end of the positioning rod located on the inner side of the wire tube has a positioning block, the end of the positioning block is provided with a V-shaped groove connected with the outer circumferential wall of the wire core, and the positioning block is made of hard plastic material.

[0028] On the basis of the above technical scheme, preferably, the extrusion die comprises an inner die and an outer die, the inner die is sleeved in the outer die and fixedly connected with the outer die, the inner die is fixedly connected with the wire outlet end of the wire tube, the inner die and the outer die have an annular channel, the annular channel is communicated with the die hole of the outer die, the outer surface of the outer die is provided with an injection port communicated with the annular channel, the outer taper angle of the inner die is smaller than the inner taper angle of the outer die, and a spiral guide plate is arranged on the outer taper surface of the inner die and connected with the inner taper surface of the outer die.

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

[0030] S1, passing the core through the wire tube and the extrusion die;

[0031] S2, adjusting the length of the plurality of positioning rods inserted into the wire tube through the adjusting device, so that the plurality of positioning rods are positioned on the outer circumferential side of the core after being enclosed, and the coaxiality of the core and the wire tube is maintained;

[0032] S3, during the horizontal transmission of the core, the driving mechanism drives the plurality of extrusion rods to move back and forth synchronously, so that the embossing protrusions on the extrusion rods exert embossing on the outer surface of the core;

[0033] S4, after the core is subjected to surface embossing treatment in the wire tube, the core enters the extrusion die to complete the coating of the insulating layer on the surface of the core.

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

[0035] (1) Through the synchronous control of the driving mechanism, the plurality of extrusion rods can move back and forth, the embossing protrusions of the extrusion rods exert embossing on the outer surface of the wire, so that the surface of the core is no longer smooth but has certain lines or roughness. After embossing, the core continues to enter the extrusion die, and in this process, the insulating material is extruded and coated on the surface of the core with embossing, which increases the contact area and friction coefficient between the core and the insulating layer, improves the adhesion between the insulating layer and the core, and makes the insulating layer more stable during coating and less likely to peel off or slide.

[0036] (2) The rotation of the annular member uniformly exerts pressure on all extrusion rods through all extrusion members, so that the depth of embossing on the entire surface of the core is consistent, achieving uniform embossing effect. The design of the first extrusion part with a spherical structure and the spherical extrusion member ensures that they closely cooperate during rotation, the spherical structure can adapt to the relative movement of the circular groove, and the smooth transition of the extrusion member during contact with the first extrusion part is ensured, reducing the friction force during contact. This spherical design effectively avoids the jamming phenomenon caused by sharp edges, making the extrusion process more smooth, thereby improving the reliability and uniformity of the entire embossing process.

[0037] (3) By setting an annular groove on the inner wall of the circular groove, the extrusion part is located in the annular groove, and at least a part of the first extrusion part can be accommodated in the annular groove. By this setting, the annular groove provides a defined rotation path for the first extrusion part, ensuring that it does not deviate during rotation. Even if there is a large stress during the cooperation of the extrusion part and the first extrusion part, the annular groove can effectively avoid the deviation problem caused by stress, ensuring the stability of the extrusion process.

[0038] (4) By setting a threaded hole on the outer surface of the annular part for installing the extrusion part, by rotating the threaded part, the second extrusion part can protrude or retract in the annular groove, so as to adjust the movement stroke of the extrusion rod during the cooperation and extrusion of the second extrusion part and the first extrusion part, so as to adapt to the requirement of different depth of embossing. Make the extrusion device suitable for the requirement of various embossing depth, so as to flexibly adjust the surface roughness of the wire core, improve the wrapping combination strength of the wire core and the insulation layer. This greatly increases the flexibility of the device in the production process, meets the requirements of different cable specifications.

[0039] (5) By setting two groups of positioning mechanisms, the wire core can always maintain stable coaxiality with the lead tube when entering and leaving the wire core surface treatment device, so as to ensure that the wire core can pass through the wire core surface treatment device, and the multiple extrusion rods can be accurately applied to the outer surface of the wire core.

[0040] (6) By adjusting the position of the positioning rod according to the diameter of the wire core, the positioning rod forms a rotary body with an inner diameter suitable for different specifications of wire core, so that the same equipment can adapt to the production requirements of wire cores with 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 adjusting device realizes the synchronous adjustment of multiple positioning rods through the ingenious gear transmission system, ensures that the wire core maintains coaxiality in the lead tube, and enables the wire core surface treatment device to accurately and stably emboss the surface of the wire core, improving the embossing precision and stability of the wire core. In addition, the structure of the adjusting device is stable, the maintenance requirement is reduced, it is suitable for wire cores with different diameters, and the versatility and production efficiency of the extrusion device are significantly improved.

[0042] (8) by making the outer taper angle of the inner mold smaller than the inner taper angle of the outer mold, the pressure gradually increases during the flow of the plastic material in the annular channel to the mold hole of the outer mold. This gradually increasing pressure helps the plastic to wrap more tightly on the surface of the wire core, enhancing the adhesion of the wire core and the insulation layer; by providing a spiral flow guide plate on the outer taper surface of the inner mold, the spiral flow guide plate not only guides the plastic material to flow along the spiral path to the mold hole of the outer mold, but also further increases the pressure in the extrusion process. In this way, the transmission speed of the plastic material is accelerated, and the plastic material maintains sufficient pressure during the extrusion process, improves the wrapping adhesion of the wire core and the insulation layer under the premise of embossing treatment on the surface of the wire core, avoids or reduces the relative slip between the insulation layer and the wire core, and improves the stability and reliability of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0044] Figure 1 The three-dimensional structure schematic diagram of the cable production extrusion device disclosed by the present application is shown in the figure.

[0045] Figure 2 The assembly structure schematic diagram of the wire tube and the wire core surface treatment device of the present application is shown in the figure.

[0046] Figure 3 The three-dimensional structure schematic diagram of the wire core surface treatment device disclosed by the present application is shown in the figure.

[0047] Figure 4 The three-dimensional structure schematic diagram of the annular part disclosed by the present application is shown in the figure.

[0048] Figure 5 The three-dimensional structure schematic diagram of the extrusion rod and the extrusion part disclosed by the present application is shown in the figure.

[0049] Figure 6 The assembly structure schematic diagram of the extrusion rod and the wire tube disclosed by the present application is shown in the figure.

[0050] Figure 7 The assembly structure schematic diagram of the positioning mechanism and the wire tube disclosed by the present application is shown in the figure.

[0051] Figure 8 The three-dimensional structure schematic diagram of the positioning mechanism disclosed by the present application is shown in the figure.

[0052] Figure 9 The top view of the cable production extrusion device disclosed by the present application is shown in the figure.

[0053] Figure 10 As Figure 9 A-A plane view in the middle;

[0054] Figure 11 As Figure 9 B-B plane view in the middle;

[0055] Figure 12 A perspective view of the extrusion die disclosed in the present application;

[0056] Reference signs:

[0057] P, core; 1, frame; 2, extrusion die; 3, wire tube; 4, core surface treatment device; 41, extrusion rod; 410, embossing protrusion; 42, driving mechanism; 421, ring-shaped part; 422, elastic part; 423, extrusion part; 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, speed reducer; 4243, driving wheel; 4244, driven wheel; 4245, transmission part; 5, positioning mechanism; 51, positioning rod; 52, adjusting device; 521, first disc body; 522, second disc body; 523, annular gear disc; 524, rotating gear; 525, driving gear; 511, tooth; 5251, adjusting knob; 512, positioning block; 5121, V-shaped groove; 21, inner die; 22, outer die; 23, annular channel; 221, feeding port; 211, spiral guide vane. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0059] As Figure 1 shown, in conjunction with Figure 2 and 3 , the embodiment of the present application discloses an extrusion device for cable production, which comprises a frame 1 and an extrusion die 2 installed on the frame 1. The frame 1 is a support structure of the overall device, and the extrusion die 2 is used to extrude and coat the insulating material on the outer surface of the wire.

[0060] The extrusion device for cable production disclosed in the embodiment further comprises a wire tube 3 and a core P surface treatment device.

[0061] The lead tube 3 is horizontally fixed on the rack 1, which plays a role of guiding the lead core P into the extrusion die 2, and ensures that the lead core P stably passes through the whole extrusion process.

[0062] The lead core surface treatment device 4 is used for treating the surface of the lead core P before the lead core P enters the extrusion die 2. Specifically, the lead core surface treatment device 4 comprises extrusion rods 41 and a driving mechanism 42. The extrusion rods 41 are provided in plurality, and the plurality of extrusion rods 41 are uniformly arranged around the central axis of the lead tube 3. One end of the extrusion rod 41 is located in the lead tube 3 and is provided with a patterned protrusion 410. The other end of the extrusion rod 41 passes through the outside of the lead tube 3 in the radial direction of the lead tube 3. The driving mechanism 42 is arranged outside the lead tube 3 and is connected with the one end of the extrusion rod 41 located outside the lead tube 3. The driving mechanism 42 is used for synchronously driving the plurality of extrusion rods 41 to reciprocate, so that the patterned protrusion 410 on the extrusion rod 41 applies a pattern to the outer surface of the lead core P.

[0063] In this embodiment, when the lead core P passes through the lead tube 3, the plurality of extrusion rods 41 can reciprocate through the synchronous control of the driving mechanism 42. The patterned protrusion 410 of the extrusion rod 41 applies a pattern to the outer surface of the lead core P, so that the surface of the lead core P is no longer smooth, but has a certain texture or roughness. After the pattern is formed, the lead core P continues to enter the extrusion die 2. In this process, the insulating material is extruded and coated on the surface of the lead core P with the pattern, which increases the contact area and the friction coefficient between the lead core P and the insulating layer, improves the adhesion between the insulating layer and the lead core, and makes the insulating layer more stable during the coating process and less likely to peel off or slide. Especially during the pulling process of the cable in long-distance laying or complex environment, the stability of the insulating layer is improved.

[0064] By increasing the pattern on the surface of the lead core P, not only the friction is increased, but also a physical fitting effect can be formed, so that the insulating layer is more firmly fixed on the surface of the lead core P. This fitting effect can effectively reduce the relative displacement of the insulating layer and reduce the risk of deformation or rupture of the insulating 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 automatically performed, which ensures that the surface texture of each lead core P is consistent, and improves the production efficiency and the consistency of the product.

[0066] In order to realize the synchronous driving of the driving mechanism 42 to reciprocate the plurality of extrusion rods 41, a preferred structure of the driving mechanism 42 is shown in this embodiment. Specifically, referring to FIG. 4, the driving mechanism 42 comprises a ring member 421, an elastic member 422, an extrusion member 423 and a power assembly 424. Figures 2-5

[0067] ​The annular member 421 is sleeved outside the wire tube 3 and is rotationally connected with the wire tube 3, 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, the plurality of extrusion pieces 423 are uniformly arranged on the inner circumferential surface of the circular groove 4211, and the end surface of the extrusion piece 423 is in a spherical shape. The end of the extrusion rod 41 extending outside the wire tube 3 is fixedly provided with a first extrusion part 411 in a spherical structure, the first extrusion part 411 is located in the circular groove 4211, the circular groove 4211 provides a mounting basis for the extrusion piece 423 and provides a movement space for the extrusion rod 41 and the extrusion piece 423. The elastic piece 422 is sleeved on the extrusion rod 41, one end of the elastic piece 422 abuts against the outer wall of the wire tube 3, and the other end abuts against the first extrusion part 411, so that the extrusion rod 41 can return to the initial position after each extrusion, and the stable embossing effect is maintained. The power assembly 424 is arranged on the rack 1 and is used for driving the annular member 421 to rotate relative to the wire tube 3.

[0068] In the initial state, the elastic piece 422 exerts a force on the first extrusion part 411, so that the first extrusion part 411 is in close contact with the inner circumferential wall of the circular groove 4211. This close abutting state provides a preloaded elastic force for the entire embossing process, so that the extrusion process is stable and the relaxation phenomenon is avoided. When the power assembly 424 drives the annular member 421 to rotate around the wire tube 3, the annular member 421 rotates relative to the plurality of extrusion rods 41, so that the first extrusion part 411 on the plurality of extrusion rods 41 relatively rotates on the inner wall of the circular groove 4211. In the rotating process, the spherical extrusion piece 423 gradually contacts the first extrusion part 411 and exerts a downward pressure on it. The pressure is smoothly transmitted through the spherical extrusion piece 423, so that the first extrusion part 411 and the extrusion rod 41 move downward, thereby forming an embossing on the wire surface. At the moment when the extrusion piece 423 passes the first extrusion part 411, the first extrusion part 411 can quickly return to the initial position due to the resetting action of the elastic piece 422, that is, it is in contact with the inner wall of the circular groove 4211, thereby preparing for the next extrusion. This reciprocating motion forms a stable embossing process on the surface of the wire core P.

[0069] The rotation of the annular member 421 uniformly applies pressure to all extrusion rods 41 through all extrusion pieces 423, so that the depth of the embossing on the entire wire core P surface is consistent, thereby achieving uniform embossing. The design of the first extrusion part 411 in a spherical structure and the spherical extrusion piece 423 enables them to closely cooperate during rotation. The spherical structure can adapt to the relative movement of the circular groove 4211, thereby ensuring smooth transition of the extrusion piece 423 during contact with the first extrusion part 411 and reducing the friction force in the contact process. This spherical design effectively avoids the jamming phenomenon caused by sharp edges, making the extrusion process more smooth, thereby improving the reliability and uniformity of the entire embossing process.

[0070] The design of the spherical extruder 423 and the first extrusion section 411 ensures that the pressure applied each time is uniform and consistent, 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, which helps the insulation layer remain stable in complex environments and improves the overall reliability of the cable.

[0071] Since the first extrusion part 411 and the extrusion member 423 are spherically fitted, and the annular member 421 is constantly rotating, when the extrusion member 423 and the first extrusion part 411 are subjected to extrusion force in the vertical direction, the extrusion member 423 will instantly pass over the first extrusion part 411. Therefore, the extrusion rod 41 can apply embossing to the surface of the wire core P instantly without affecting the horizontal conveying of the wire core P. This ensures that the wire core P can be conveyed. During the conveying process, the extrusion rod 41 intermittently applies embossing to the surface of the wire core P. By controlling the rotation speed of the annular member 421, the spacing between two adjacent embossings in the axial direction of the wire core P can be adjusted.

[0072] It is worth noting that the first extrusion part 411 is in direct contact with the inner wall of the circular groove 4211. Since the inner circumferential wall of the circular groove 4211 is smooth, there is a large uncertainty when the spherical structure of the first extrusion part 411 is in contact with the extruder 423. Specifically, when the first extrusion part 411 and the spherical structure of the extruder 423 are in contact, the contact between the spherical surfaces may cause stress concentration at the moment when the extruder 423 passes the first extrusion part 411. This stress concentration will affect the stability of the fit and may cause extrusion deviation, thus making it impossible to guarantee the uniform distribution of force during the extrusion process.

[0073] Therefore, refer to the appendix Figure 3 , 4 As shown in Figure 10, the configuration of this embodiment is as follows: an annular groove 4212 is provided on the inner peripheral wall of the circular groove 4211, the extruder 423 is located in the annular groove 4212, and at least a portion of the first extrusion part 411 can be accommodated in the annular groove 4212. This configuration provides a defined rotation path for the first extrusion part 411, ensuring that it does not shift during rotation. Even if significant stress occurs during the engagement of the extruder 423 and the first extrusion part 411, the annular groove 4212 can effectively prevent shifting due to stress, ensuring the stability of the extrusion process.

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

[0075] Therefore, refer to the appendix Figure 5 and 6 As shown, in this embodiment, a guide sleeve 31 is fixedly installed on the inner circumferential wall of the wire conduit 3. The guide sleeve 31 provides a guide path for the extrusion rod 41, ensuring its axial stability during reciprocating motion. The extrusion rod 41 moves through the guide sleeve 31. A guide protrusion 412 is formed on the outer circumferential wall of the extrusion rod 41 along its axial direction, and a guide groove 311 is formed on the inner circumferential wall of the guide sleeve 31 to cooperate with 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 and ensuring the consistency of all embossing.

[0076] To accommodate adjustments for different embossing depths, this embodiment also includes the following technical solution, as detailed in the appendix. Figure 3 , 5 As shown in Figure 10, specifically, the outer circumferential surface of the annular member 421 has a threaded hole 4213 for mounting the extrusion member 423. The threaded hole 4213 communicates with the annular groove 4212, thereby allowing the extrusion member 423 to be mounted on the annular member 421 through the threaded hole 4213. 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 extension length of the extrusion member 423 in the annular groove 4212.

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

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

[0079] Due to the cooperation of the threaded part 4231 and the threaded hole 4213, the position of the extrusion piece 423 is very simple to adjust, and only needs to rotate the threaded part 4231 to adjust the depth of the embossing, which is convenient to operate without additional tools, and is convenient for quick adjustment.

[0080] The embodiment shows a preferred structure of the power assembly 424. Specifically, referring to the accompanying drawings Figure 2 As shown in the figure, the power assembly 424 includes a servo motor 4241, a speed reducer 4242, a driving wheel 4243, a driven wheel 4244 and a transmission member 4245. The servo motor 4241 is fixedly arranged on the rack 1. The input shaft of the speed reducer 4242 is connected with the output shaft of the servo motor 4241. The output shaft of the speed reducer 4242 is connected with the driving wheel 4243. 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 annular member 421. The speed reducer 4242 can provide a lower rotation speed to meet the rotation requirement of the annular member 421. The driven wheel 4244 is fixedly arranged at one end of the annular member 421 away from the circular groove 4211. The driven wheel 4244 is drivingly connected with the driving wheel 4243 through the transmission member 4245.

[0081] Through the driving connection of the servo motor 4241, the speed reducer 4242, the driving wheel 4243 and the driven wheel 4244, the annular member 421 can rotate relative to the wire tube 3. This rotation drives the plurality of extrusion pieces 423 in the annular member 421 to rotate synchronously along the circular groove 4211, thereby realizing continuous embossing processing of the outer surface of the core P. Since the annular member 421 drives the extrusion pieces 423 to rotate, the spherical end surface of the extrusion piece 423 always maintains cooperative contact with the first extrusion part 411 on the extrusion rod 41. Through the rotation of the annular member 421, the plurality of extrusion pieces 423 can be synchronously acted on the outer surface of the core P, thereby forming a uniform embossing effect.

[0082] The power assembly 424 can accurately control the rotation speed and angle of the annular member 421 through the cooperation of the servo motor 4241 and the speed reducer 4242, thereby realizing high-precision control of the embossing depth and embossing shape. This accurate control capability makes the embossing effect in the cable production process more consistent. By controlling the rotation speed of the annular member 421, the spacing between two adjacent embossings in the axial direction of the core P can be controlled, thereby obtaining uniform embossing in the axial direction of the core P, which can avoid the speed being too fast to cause the embossings to overlap and damage the surface of the core P.

[0083] Because the core P is not rigid enough and has a certain flexibility, when passing through the lead tube 3 into the extrusion die 2, the core P is easy to cause deviation and shaking due to inertia or vibration, which causes the core P to not always keep coaxial state with the lead tube 3, which makes the multiple extrusion rods 41 of the core surface treatment device 4 not accurately apply the embossing on the surface of the core P in the working process, which will cause the core P surface embossing misplacement and uneven embossing depth.

[0084] To this end, the solution adopted by the embodiment is to refer to the drawings Figure 7 、 9 , 11, and two sets of positioning mechanisms 5 are also provided, which are arranged on the lead tube 3 on both sides of the core surface treatment device 4, for keeping the core P and the lead tube 3 coaxial when passing through the core surface treatment device 4. In this way, the core P can always keep stable coaxial with the lead tube 3 when entering and leaving the core surface treatment device 4, so as to ensure that the multiple extrusion rods 41 can accurately apply uniform embossing on the outer peripheral surface of the core P when passing through the core surface treatment device 4.

[0085] Specifically, referring to the drawings Figure 8 , the positioning mechanism 5 of the embodiment includes positioning rods 51 and an adjusting device 52. The positioning rods 51 are provided in multiple numbers and are uniformly arranged around the center axis of the lead tube 3. One end of the positioning rods 51 is located in the lead tube 3 for contacting the outer side wall of the core P, and the other end passes through the outer side of the lead tube 3 in the radial direction of the lead tube 3 for connecting with the adjusting device 52. The adjusting device 52 is fixedly arranged on the outer peripheral side of the lead tube 3 for driving the multiple positioning rods 51 to move horizontally synchronously to adjust the length of the multiple positioning rods 51 extending into the lead tube 3.

[0086] When the core P is about to enter the lead tube 3, the adjusting device 52 shortens the extension length of the multiple positioning rods 51 to ensure that the core P can smoothly enter the lead tube 3 without being hindered. When the core P passes through the lead tube 3 and enters the extrusion die 2, the adjusting device 52 drives the multiple positioning rods 51 to move horizontally synchronously to increase the extension length of the positioning rods 51 in the lead tube 3, so that the positioning rods 51 surround the outer periphery of the core P and contact the surface thereof. In this way, the positioning rods 51 can effectively support the core P and keep the core P coaxial in the lead tube 3. Because the positioning mechanisms 5 are arranged on both sides of the core surface treatment device 4, the core P has two positioning points in the axial direction, so that the core P is straightened coaxially, and the core surface treatment device 4 between the two positioning mechanisms 5 can accurately and stably perform embossing work on the surface of the core P.

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

[0088] The embodiment shows a preferred structure of the adjusting device 52. Specifically, referring to the accompanying drawings Figure 8 As shown in the drawings, 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 drive gear 525.

[0089] The first disc body 521 is coaxially fixedly arranged outside the lead tube 3, and provides support and fixing for the entire adjusting device 52.

[0090] One end of the positioning rod 51 is located inside the lead tube 3, and the other end horizontally passes through the outside of the lead tube 3 and is slidably connected with the first disc body 521, so that the positioning rod 51 can slide on the first disc body 521, thereby adjusting the length of the positioning rod 51 extending into the lead tube 3.

[0091] The positioning rod 51 is provided with teeth 511 on the side wall, the number of rotating gears 524 is consistent with the number of positioning rods 51, the rotating gears 524 are rotationally arranged on the first disc body 521, and are located on the side of the corresponding positioning rod 51 and are meshingly connected with the teeth 511. Through the rotation of the rotating gear 524, the positioning rod 51 can be driven to slide on the first disc body 521, thereby adjusting the length of the positioning rod 51 extending into the lead tube 3.

[0092] The annular gear disc 523 is horizontally arranged above the positioning rod 51, the inner teeth of the annular gear disc 523 are meshingly connected with the plurality of rotating gears 524; the inner teeth of the annular gear disc 523 are meshingly connected with the plurality of rotating gears 524, achieving the effect of one driving source driving the synchronous movement of the plurality of positioning rods 51.

[0093] The second disc body 522 is located above the annular gear disc 523 and is fixedly connected with the lead tube 3, the drive gear 525 is rotationally arranged between the first disc body 521 and the second disc body 522, and the drive gear 525 is meshingly connected with the outer teeth of the annular gear disc 523, the center shaft of the drive gear 525 is movably arranged through the outside of the first disc body 521 or the second disc body 522 and is connected with the adjusting knob 5251.

[0094] The rotation of the adjusting knob 5251 drives the driving gear 525 to rotate, and then the rotation of the ring gear 523 drives the plurality of rotating gears 524 to rotate synchronously, so that all the positioning rods 51 can be synchronously extended or retracted. This structure ensures that all the positioning rods 51 can be extended or retracted at the same pace in the lead-through tube 3, realizes the coaxial positioning of the core P, and prevents the core P from shaking or deviating due to the asynchronization of the positioning rods 51.

[0095] In the embodiment, the adjusting knob can be a hexagonal knob or other forms of rotating adjusting structure.

[0096] The ring gear 523 is engaged with the rotating gears 524 and the driving gear 525 through the inner and outer teeth, so that the entire adjusting device 52 forms a compact mechanical transmission chain. The stability of this structure is high, which can reduce the loosening problem of the positioning rods 51 caused by vibration or other factors, reduce the maintenance requirement, and improve the reliability of the device.

[0097] The engagement of the teeth 511 on the side wall of the positioning rod 51 with the rotating gear 524 enables the movement of the positioning rod 51 to be accurately controlled. The driving force provided by the adjusting knob 5251 can enable the positioning rod 51 to realize small-amplitude accurate adjustment through the gear transmission structure, so as to adapt to the requirements of cores P of different diameters.

[0098] The adjusting device 52 realizes the synchronous adjustment of a plurality of positioning rods 51 through a clever gear transmission system, ensures that the core P remains in a coaxial state in the lead-through tube 3, enables the core surface treatment device 4 to accurately and stably perform the embossing work on the surface of the core P, and improves the embossing work precision and stability of the core P. In addition, the structure of the adjusting device 52 is stable, reduces the maintenance requirement, adapts to cores P of various diameters, and significantly improves the universality and production efficiency of the extrusion device.

[0099] As some preferable embodiments, one end of the positioning rod 51 inside the lead-through tube 3 is provided with a positioning block 512, the end of the positioning block 512 is provided with a V-shaped groove 5121 connected with the outer peripheral wall of the core P, and the positioning block 512 is made of hard plastic material.

[0100] The V-shaped groove 5121 on the positioning block 512 can reliably contact the outer peripheral wall of the core P, provide support and ensure the coaxiality of the core P in the lead-through tube 3, thereby improving the stability of the core P in 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 of the core P caused by metal materials, prolongs the service life of the equipment and the core P.

[0101] Referring to the drawings Figure 11 and 12As shown, the extrusion die 2 disclosed in the embodiment comprises an inner die 21 and an outer die 22, the inner die 21 is sleeved in the outer die 22 and fixedly connected with the outer die 22, the inner die 21 is fixedly connected with the outgoing end of the wire tube 3, the annular channel 23 is arranged between the inner die 21 and the outer die 22, the annular channel 23 is communicated with the die hole of the outer die 22, the outer surface of the outer die 22 is provided with the injection port 221 communicated with the annular channel 23 near one end of the wire tube 3, which is used for being connected with the injection molding machine, the outer taper angle of the inner die 21 is smaller than the inner taper angle of the outer die 22, and the outer taper surface of the inner die 21 is provided with the spiral flow guide plate 211, and the outer surface of the spiral flow guide plate 211 is connected with the inner taper surface of the outer die 22.

[0102] By adopting the technical scheme, the outer taper angle of the inner die 21 is smaller than the inner taper angle of the outer die 22, and the structure ensures that the pressure gradually increases during the flow of the plastic material in the annular channel 23 to the die hole of the outer die 22. The gradually increasing pressure helps the plastic to be more tightly wrapped on the surface of the wire core P, and enhances the adhesion of the wire core P and the insulation layer. The spiral flow guide plate 211 arranged on the outer taper surface of the inner die 21 not only guides the plastic material to flow along the spiral path to the die hole of the outer die 22, but also further improves the pressure in the extrusion process. In this way, the transmission speed of the plastic material is accelerated, and the plastic material maintains sufficient pressure in the extrusion process. Under the premise of the embossing treatment on the surface of the wire core P, the wrapping adhesion of the wire core P and the insulation layer is improved, the relative sliding 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 application further discloses a cable extrusion method using the extrusion device for cable production.

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

[0105] S2, the length of the plurality of positioning rods 51 inserted into the wire tube is adjusted by the adjusting device 52, so that the plurality of positioning rods 51 are positioned on the outer circumferential side of the wire core P after being enclosed, and the wire core P is kept coaxial with the wire tube 3; this step ensures that the wire core P keeps the central position during the whole transmission and processing process, and prevents deviation, thereby laying a foundation for the accuracy of the subsequent process.

[0106] S3, during the horizontal transmission of the wire core P, the driving mechanism 42 drives the plurality of extrusion rods 41 to move synchronously and reciprocally, so that the embossing protrusions 410 on the extrusion rods 41 exert embossing on the outer surface of the wire core P; the embossing treatment not only increases the friction force of the surface of the wire core P, but also improves the adhesion between the insulation layer and the wire core P, so that the insulation layer is more stable during the wrapping process and is not easy to peel off or slide.

[0107] S4, the wire core P is surface embossed in the lead tube 3, and then enters the extrusion die 2 to complete the coating operation of the insulation layer on the surface of the wire core P. Since the wire core P has been positioned and surface embossed, the insulation layer can closely adhere 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 only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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: Also include the wire tube (3) and the core surface treatment device (4); wherein, The wire tube (3) is horizontally fixedly arranged on the rack (1) and connected with the extrusion die (2), and is used for guiding the core (P) to enter the extrusion die (2); The core surface treatment device (4) comprises an extrusion rod (41) and a driving mechanism (42), the extrusion rod (41) is provided in plurality, the plurality of extrusion rods (41) are uniformly 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 a embossed convex (410), the other end of the extrusion rod (41) is movably arranged through the outside of the wire tube (3) along the radial direction of the wire tube (3), the driving mechanism (42) is arranged outside the wire tube (3) and connected with the one end of the extrusion rod (41) outside 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 convex (410) on the extrusion rod (41) applies embossed pattern to the outer surface of the core (P); The driving mechanism (42) comprises a ring member (421), an elastic member (422), an extrusion member (423) and a power assembly (424); The ring member (421) is sleeved outside the wire tube (3) and is rotatably connected with the wire tube (3), one end surface of the ring member (421) is provided with a circular groove (4211); The number of the extrusion member (423) is consistent with the number of the extrusion rod (41), and the plurality of extrusion members (423) are uniformly arranged on the inner circumferential surface of the circular groove (4211), and the end surface of the extrusion member (423) is in spherical shape; The one end of the extrusion rod (41) extending out of the wire tube (3) is fixedly provided with a first extrusion part (411) in spherical structure, and the first extrusion part (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) abuts against the outer wall of the wire tube (3), and the other end abuts against the first extrusion part (411); The power assembly (424) is arranged on the rack (1) and is used for driving the ring member (421) to rotate relative to the wire tube (3).

2. The extrusion device for cable production as claimed in claim 1, characterized in that: The inner circumferential wall of the circular groove (4211) is provided with an annular groove (4212), the extrusion member (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); The inner circumferential wall of the wire tube (3) is fixedly provided with a guide sleeve (31), the extrusion rod (41) movably passes through the guide sleeve (31), the outer circumferential wall of the extrusion rod (41) is provided with a guide convex (412) along the axial direction, and the inner circumferential wall of the guide sleeve (31) is provided with a guide groove (311) matched with the guide convex (412).

3. The extrusion device for cable production as claimed in claim 2, characterized in that: The outer peripheral surface of the ring-shaped part (421) is provided with a threaded hole (4213) for mounting an extrusion part (423), the threaded hole (4213) is communicated with an annular groove (4212), the extrusion part (423) comprises a threaded part (4231) and a second extrusion part (4232) fixedly connected with the threaded part (4231), the second extrusion part (4232) is a spherical structure, the second extrusion part (4232) is located in the annular groove (4212), and the threaded part (4231) is threadedly connected with the threaded hole (4213).

4. The extrusion device for cable production as claimed in claim 1, characterized in that: The power assembly (424) comprises a servo motor (4241), a speed reducer (4242), a driving wheel (4243), a driven wheel (4244) and a transmission member (4245), the servo motor (4241) is fixedly arranged on the rack (1), the input shaft of the speed reducer (4242) is connected with the output shaft of the servo motor (4241), the output shaft of the speed reducer (4242) is connected with the driving wheel (4243), the driven wheel (4244) is fixedly arranged on one end of the ring-shaped part (421) away from the circular groove (4211), and the driving wheel (4243) and the driven wheel (4244) are drivingly connected through the transmission member (4245).

5. The extrusion device for cable production as claimed in claim 1, characterized in that: The two sets of positioning mechanisms (5) are arranged on the wire tube (3) on the two sides of the core surface treatment device (4) respectively, and are used for keeping the wire core (P) and the wire tube (3) coaxial after passing through the core surface treatment device (4); The positioning mechanism (5) comprises a positioning rod (51) and an adjusting device (52), a plurality of positioning rods (51) are arranged uniformly around the central axis of the wire tube (3), one end of the positioning rod (51) is located in the wire tube (3) and is used for contacting the outer side wall of the wire core (P), the other end of the positioning rod (51) moves in the radial direction of the wire tube (3) and passes through the outer side of the wire tube (3), and the adjusting device (52) is fixedly arranged on the outer peripheral side of the wire tube (3) and is used for driving the plurality of positioning rods (51) to move horizontally synchronously, so as to adjust the length of the plurality of positioning rods (51) extending into the wire tube (3).

6. The extrusion device for cable production as claimed in claim 5, characterized in that: The adjusting device (52) comprises a first disc body (521), a second disc body (522), an annular toothed disc (523), a rotating gear (524) and a driving gear (525); The first disc body (521) is coaxially fixedly arranged on the outer side of the wire tube (3), one end of the positioning rod (51) located on the outer side of the wire tube (3) is slidably connected with the first disc body (521), and a tooth (511) is arranged on the side wall of the positioning rod (51); The number of the rotating gears (524) is consistent with the number of the positioning rods (51), the rotating gears (524) are rotatably arranged on the first disc body (521) and located on the side of the corresponding positioning rod (51) and are in meshing connection with the tooth (511); The annular toothed disc (523) is arranged above the positioning rod (51), and the inner teeth of the annular toothed disc (523) are in meshing connection with the plurality of rotating gears (524). The second disc body (522) is located above the annular gear disc (523) and is fixedly connected with the lead tube (3), the driving gear (525) is rotatably arranged between the first disc body (521) and the second disc body (522), and the driving gear (525) is in meshing connection with the outer gear of the annular gear disc (523), and the central shaft of the driving gear (525) is movably arranged through the outside of the first disc body (521) or the second disc body (522) and is connected with the adjusting knob (5251).

7. The extrusion device for cable production as claimed in claim 5, characterized in that: The positioning rod (51) is provided with a positioning block (512) at one end inside the lead tube (3), the positioning block (512) is provided with a V-shaped groove (5121) at the end connected with the outer peripheral wall of the wire core (P), and the positioning block (512) is made of hard plastic material.

8. The extrusion device for cable production as claimed in 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 is fixedly connected with the outer die (22), the inner die (21) is fixedly connected with the wire outlet end of the lead tube (3), the inner die (21) and the outer die (22) have an annular channel (23) therebetween, the annular channel (23) is in communication with the die hole of the outer die (22), the outer surface of the outer die (22) is provided with an injection port (221) in communication with the annular channel (23) at one end close to the lead tube (3), the outer taper angle of the inner die (21) is smaller than the inner taper angle of the outer die (22), and the outer taper surface of the inner die (21) is provided with a spiral flow guide plate (211), and the outer surface of the spiral flow guide plate (211) is connected with the inner taper surface of the outer die (22).

9. A cable extrusion method using the extrusion device for cable production according to any one of claims 5 to 8, characterized in that: The steps include the following: S1, the wire core is inserted into the lead tube and the extrusion die; S2, the lengths of the plurality of positioning rods inserted into the lead tube are adjusted by the adjusting device, so that the plurality of positioning rods are positioned on the outer peripheral side of the wire core after being enclosed, and the wire core and the lead tube are kept coaxial; S3, in the horizontal transmission process of the wire core, the driving mechanism drives the plurality of extrusion rods to move synchronously and reciprocally, so that the embossing protrusions on the extrusion rods exert embossing on the outer surface of the wire core; S4, after the wire core is subjected to surface embossing treatment in the lead tube, the wire core enters the extrusion die to complete the coating operation of the insulation layer on the surface of the wire core.

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