Fireproof compression-resistant cable and production device thereof

Abstract

The invention discloses a fireproof compression-resistant cable and a production device thereof, and relates to the technical field of cable production, and the fireproof compression-resistant cable comprises a cable core and a fireproof compression-resistant rubber layer which is formed at the outer side through extrusion molding; the fireproof compression-resistant rubber layer is arranged on the outer side of the cable core, the insulating plastic layer is formed on the outer side of the fireproof compression-resistant rubber layer through extrusion molding, and the cable core, the insulating plastic layer and the fireproof compression-resistant rubber layer are combined to form the cable. According to the invention, the fireproof and compression-resistant rubber layer and other parts are arranged, and the fireproof and compression-resistant rubber layer is extruded between the insulating plastic layer and the cable core, so that the fireproof and compression-resistant capabilities of the cable in the use process are improved, the risk of cable core damage in a fire scene is reduced, and the service life of the cable in a high-temperature environment is prolonged; meanwhile, the rubber material has good elasticity and pressure resistance, can buffer external extrusion, collision and other acting forces, prevents the cable core from being deformed or broken due to external force, and guarantees the transmission function of the cable.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, specifically to a fire-resistant and pressure-resistant cable and its manufacturing apparatus. Background Technology

[0002] As a core component in fields such as power transmission and communication connections, cables typically consist of a core made up of several or groups of conductors twisted together to form a rope-like structure. Each group of conductors is insulated from the others and is arranged around a central point. Subsequently, insulating plastic is extruded onto the outside of the core using a specialized extruder to form an insulating layer that provides insulation and protection, thus meeting the basic insulation requirements for power transmission.

[0003] However, in practical applications, the structural design of traditional cables has significant shortcomings: their protective function relies solely on a single outer insulating plastic layer, lacking specialized protective structural designs for fire-resistant and pressure-resistant scenarios. When cables are in high-temperature environments, fire scenarios, or subjected to complex conditions such as external compression or collisions, the existing protective structure is unable to withstand external influences, easily leading to damage to the cable core and failure of the insulation layer, which in turn causes power transmission interruptions and even induces safety hazards. This severely restricts the reliability of cables in complex environments and fails to meet higher standards of safety protection requirements. To address these issues, we provide a fire-resistant and pressure-resistant cable and its production equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a fire-resistant and pressure-resistant cable and its production device in order to solve the problem of poor cable protection.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fire-resistant and pressure-resistant cable, comprising: a cable core and a fire-resistant and pressure-resistant rubber layer extruded on the outside; an insulating plastic layer, wherein the insulating plastic layer is extruded on the outside of the fire-resistant and pressure-resistant rubber layer, the cable core, the insulating plastic layer, and the fire-resistant and pressure-resistant rubber layer are combined to form a cable; and a stepped groove, wherein the stepped groove is disposed on the outside of the fire-resistant and pressure-resistant rubber layer to improve the fit between the insulating plastic layer and the fire-resistant and pressure-resistant rubber layer.

[0006] As a further embodiment of the present invention: multiple stepped grooves are provided, and the multiple stepped grooves are distributed at equal intervals in a stepped manner on the outside of the fireproof and pressure-resistant rubber layer.

[0007] To adapt to the aforementioned fire-resistant and pressure-resistant cable, the present invention also proposes a fire-resistant and pressure-resistant cable production apparatus, comprising the following structure:

[0008] An insulating material extruder and a fire-resistant and pressure-resistant material extruder located on one side of the insulating material extruder, wherein the fire-resistant and pressure-resistant material extruder extrudes a fire-resistant and pressure-resistant rubber layer onto the outside of the cable core, and the insulating material extruder extrudes an insulating plastic layer onto the outside of the fire-resistant and pressure-resistant rubber layer.

[0009] The mold is provided in two parts, and the two molds are respectively installed at the discharge port of the insulating material extruder and the fireproof and pressure-resistant material extruder.

[0010] A roller pressing aid, located at the end of one of the molds, is used to roll the surface of the fire-resistant and pressure-resistant rubber layer to form stepped grooves.

[0011] As a further embodiment of the present invention: the roller pressing auxiliary device includes a fixed frame fixedly connected to the outer wall of one of the molds, a second auxiliary ring fixedly connected to the front end of the fixed frame, a first auxiliary ring fixedly connected to the front end of the second auxiliary ring via a connecting rod, and multiple pressure rollers are provided on the inner sides of both the first and second auxiliary rings. The two sets of pressure rollers are distributed at equal distances around the inner sides of the first and second auxiliary rings, respectively. Adjustment components for adjusting the pressure rollers are provided on the inner sides of both the first and second auxiliary rings.

[0012] As a further embodiment of the present invention: the roller pressing auxiliary device further includes an auxiliary frame disposed on the outside of each pressing roller, the pressing roller is rotatably connected to the auxiliary frame through a connecting shaft fixedly connected to the outside, and a plurality of pressing heads are fixedly connected to the outer wall of the pressing roller, the plurality of pressing heads being distributed at equal distances around the outer wall of the pressing roller.

[0013] As a further aspect of the present invention: each of the pressure heads has a stepped surface on its outer side, through which the outer side of the fireproof and pressure-resistant rubber layer is rolled into a stepped groove.

[0014] As a further aspect of the present invention: the distance by which the set of pressure rollers on the inner side of the second auxiliary ring presses against the outer wall of the fireproof and pressure-resistant rubber layer is less than the distance by which the set of pressure rollers on the inner side of the first auxiliary ring presses against the outer wall of the fireproof and pressure-resistant rubber layer.

[0015] As a further embodiment of the present invention: the adjustment assembly includes a plurality of one-way threaded screws rotatably connected to the inner sides of the second auxiliary ring and the first auxiliary ring, each of the one-way threaded screws being correspondingly disposed on one side of an auxiliary frame, and each of the auxiliary frames being threadedly connected to the outer wall of the one-way threaded screw.

[0016] As a further embodiment of the present invention: the adjusting assembly further includes a bevel gear ring rotatably connected to the outer walls of the first auxiliary ring and the second auxiliary ring, a bevel gear is fixedly connected to the outer wall of each one-way threaded screw, and each bevel gear meshes with the bevel gear ring, a plurality of fixing brackets are fixedly connected to the outer walls of the first auxiliary ring and the second auxiliary ring, each fixing bracket is correspondingly disposed on one side of one one-way threaded screw, and each one-way threaded screw is rotatably connected to the end of the fixing bracket, a drive motor is installed at one end of the fixing bracket on the outer walls of the first auxiliary ring and the second auxiliary ring, and the output end of the drive motor is fixedly connected to the one-way threaded screw.

[0017] As a further embodiment of the present invention: multiple suspension brackets are fixedly connected to the inner sides of the first auxiliary ring and the second auxiliary ring, and the multiple suspension brackets are respectively arranged on one side of one of the auxiliary brackets. A limiting block is fixedly connected to one side of each auxiliary bracket. A limiting groove matching the limiting block is opened on the inner side of the suspension bracket. The auxiliary bracket is slidably connected to the suspension bracket through the limiting block fixedly connected to the outer wall.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. By incorporating components such as a fire-resistant and pressure-resistant rubber layer, and extruding this layer between the insulating plastic layer and the cable core, the cable's fire resistance and pressure resistance during use are increased. This reduces the risk of core damage in fire scenarios and extends the cable's lifespan in high-temperature environments. The rubber material also possesses excellent elasticity and pressure resistance, buffering external pressure and impact forces to prevent core deformation or breakage, thus ensuring the cable's transmission function. Furthermore, the stepped grooves on the outer side of the fire-resistant and pressure-resistant rubber layer increase the contact area between the layer and the insulating plastic layer, creating a "biting" effect after extrusion, significantly improving fit. The evenly distributed design ensures more uniform force distribution during bonding, effectively preventing the insulating plastic layer from detaching or shifting during long-term use, and enhancing the overall stability and durability of the cable structure.

[0020] 2. By setting up components such as pressure rollers, when the cable core is being processed, the fire-resistant and pressure-resistant rubber layer is extruded onto the outside of the cable core through the mold at the end of the fire-resistant and pressure-resistant material extruder. After cooling, the formed fire-resistant and pressure-resistant rubber layer is then extruded onto the outside of the fire-resistant and pressure-resistant rubber layer through the mold at the end of the insulation material extruder. During this process, the pressure head on the outer wall of the pressure roller is set with a stepped surface, which directly contacts the freshly extruded fire-resistant and pressure-resistant rubber layer. The roller pressing accurately replicates the stepped groove that matches the stepped surface. Since the fire-resistant and pressure-resistant rubber layer is in a semi-softened state after extrusion, the roller pressing at this time can ensure that the stepped groove has a regular shape and consistent size, avoiding the problems of difficult processing or poor forming after hardening. At the same time, the multiple pressure rollers are distributed around and the pressure heads are arranged at equal intervals. With the uniform movement of the cable core, the stepped groove is distributed in a "stepped" manner on the outside of the rubber layer, providing a uniform interlocking foundation for the subsequent extrusion and bonding of the insulation plastic layer, thereby improving the stability after extrusion.

[0021] 3. By using components such as stepped grooves, during the extrusion process where the cable core passes through the mold, the pressure head abuts against the outer side of the fire-resistant and pressure-resistant rubber layer. The thrust generated by the movement of the cable core then pushes the pressure roller to rotate, forming a rolling operation. The distance between the pressure head on the outer side of the pressure roller and the center of the fire-resistant and pressure-resistant rubber layer is between the inner and outer diameters of the rubber layer, facilitating contact. When the cable core passes through the mold at the front end of the fire-resistant and pressure-resistant material extruder, the pressure head on the outer side of the second auxiliary ring presses against the outer side of the fire-resistant and pressure-resistant rubber layer, molding the surface of the layer. Multiple stepped grooves are designed to facilitate the extrusion of the insulating plastic layer onto the outside of the fire-resistant and pressure-resistant rubber layer using an insulating material extruder. The stepped grooves completely fill the recessed spaces during extrusion, forming a "protrusion-recession" mechanical interlocking structure. This interlocking structure far exceeds the frictional force of flat bonding. This interlocking effectively resists external forces during cable bending, stretching, or long-term use, preventing the insulation layer and the fire-resistant and pressure-resistant rubber layer from shifting or falling off. With the two layers tightly bonded, the protective function of the fire-resistant and pressure-resistant rubber layer can be stably maintained, and the pressure resistance and fire resistance will not be affected by the loosening between the layers. This improves the stability of the cable after extrusion molding.

[0022] 4. By setting up components such as the second auxiliary ring, the distance that the pressure rollers on the inner side of the second auxiliary ring roll against the outer wall of the fireproof and pressure-resistant rubber layer is less than the distance that the pressure rollers on the inner side of the first auxiliary ring roll against the outer wall of the fireproof and pressure-resistant rubber layer. This allows the newly extruded fireproof and pressure-resistant rubber layer to be initially rolled by the pressure head on the inner side of the second auxiliary ring, and finally rolled again by the fireproof and pressure-resistant rubber layer on the inner side of the first auxiliary ring. The newly extruded fireproof and pressure-resistant rubber layer is in a softened state, and direct strong rolling can easily lead to tearing, denting, or cable core misalignment. The initial rolling with the second auxiliary ring first defines the contour, and then the first auxiliary ring strengthens the rolling, dispersing the molding pressure and avoiding structural damage caused by one-time processing. Step-by-step rolling allows the rubber layer to slowly release internal stress during molding, reducing the risk of shrinkage and deformation during subsequent cooling or use. The stable shape of the stepped groove ensures that the insulating plastic layer can be fully filled and interlocked after extrusion, avoiding the impact of interlayer bonding force due to deformation of the stepped groove.

[0023] 5. By setting up components such as bevel gears, when it is necessary to adjust the roller pressure, the drive motor is started. The output end of the drive motor drives the one-way threaded screw to rotate, which in turn drives the bevel gear ring to rotate. This drives other bevel gears to drive one-way threaded screws to rotate synchronously, thereby adjusting the position of multiple auxiliary frames. This allows the distance between multiple pressure rollers and the cable core to be adjusted according to requirements, enabling the switching of production specifications and improving the equipment's versatility and production flexibility. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of one side of the mold structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a schematic diagram of the first auxiliary ring and the second auxiliary ring of the present invention;

[0028] Figure 5 This is a schematic diagram of the inner structure of the first auxiliary ring of the present invention;

[0029] Figure 6 This is a schematic diagram of the auxiliary frame structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the pressure roller structure of the present invention;

[0031] Figure 8 This is a cross-sectional view of the cable core of the present invention;

[0032] Figure 9 This is a schematic diagram of the stepped groove structure of the present invention.

[0033] In the diagram: 1. Extruder for insulating materials; 2. Extruder for fire-resistant and pressure-resistant materials; 3. Mold; 4. Cable; 5. Fixing frame; 6. First auxiliary ring; 7. Second auxiliary ring; 8. Connecting rod; 9. Pressure roller; 10. Fixing frame; 11. Bevel gear; 12. Drive motor; 13. One-way threaded screw; 14. Bevel gear ring; 15. Auxiliary frame; 16. Suspension frame; 17. Connecting shaft; 18. Pressure head; 19. Stepped surface; 20. Cable core; 21. Insulating plastic layer; 22. Stepped groove; 23. Fire-resistant and pressure-resistant rubber layer. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0036] Please see Figures 8-9This embodiment provides a fire-resistant and pressure-resistant cable, including: a cable core 20 and a fire-resistant and pressure-resistant rubber layer 23 extruded on the outside; an insulating plastic layer 21, which is extruded on the outside of the fire-resistant and pressure-resistant rubber layer 23; the cable core 20, the insulating plastic layer 21, and the fire-resistant and pressure-resistant rubber layer 23 are combined to form a cable 4; and stepped grooves 22, which are provided on the outside of the fire-resistant and pressure-resistant rubber layer 23 to improve the fit between the insulating plastic layer 21 and the fire-resistant and pressure-resistant rubber layer 23. Multiple stepped grooves 22 are provided, and the multiple stepped grooves 22 are distributed in a stepped manner at equal intervals on the outside of the fire-resistant and pressure-resistant rubber layer 23.

[0037] Firstly, the cable 4 is typically formed by extruding an insulating plastic layer 21 onto the outer wall of the cable core 20. By extruding a fire-resistant and pressure-resistant rubber layer 23 onto the insulating plastic layer 21 and the cable core 20, the fire resistance and pressure resistance of the cable 4 during use are increased, reducing the risk of damage to the cable core in fire scenarios and extending the service life of the cable in high-temperature environments. At the same time, the rubber material has good elasticity and pressure resistance, which can buffer external extrusion, collision and other forces, preventing the cable core from deforming or breaking due to external forces, and ensuring the cable transmission function. In addition, the stepped groove 22 opened on the outside of the fire-resistant and pressure-resistant rubber layer 23 increases the contact area between the fire-resistant and pressure-resistant rubber layer 23 and the insulating plastic layer 21, allowing the two layers to form an "interlocking" effect after extrusion, greatly improving the fit. The equidistant distribution design makes the bonding force more uniform, effectively preventing the insulating plastic layer 21 from falling off or shifting during long-term use, and enhancing the overall structural stability and durability of the cable 4.

[0038] Please see Figures 1-9 To adapt to the aforementioned fire-resistant and pressure-resistant cable, the present invention also proposes a fire-resistant and pressure-resistant cable production apparatus, comprising the following structure:

[0039] An insulating material extruder 1 and a fire-resistant and pressure-resistant material extruder 2, located on one side of the insulating material extruder 1, are used. The fire-resistant and pressure-resistant material extruder 2 extrudes the fire-resistant and pressure-resistant rubber layer 23 onto the outside of the cable core 20, while the insulating material extruder 1 extrudes the insulating plastic layer 21 onto the outside of the fire-resistant and pressure-resistant rubber layer 23. Two molds 3 are provided, and the two molds 3 are respectively installed at the discharge ports of the insulating material extruder 1 and the fire-resistant and pressure-resistant material extruder 2. A roller pressing auxiliary device is located at the end of one of the molds 3 and is used to roll the surface of the fire-resistant and pressure-resistant rubber layer 23 to form a stepped groove 22. The roller pressing auxiliary device includes a fixed frame 5 fixedly connected to the outer wall of one of the molds 3, and a second auxiliary device is fixedly connected to the front end of the fixed frame 5. The auxiliary ring 7 and the front end of the fixed frame 5 are fixedly connected to the second auxiliary ring 7. The front end of the second auxiliary ring 7 is fixedly connected to the first auxiliary ring 6 through the connecting rod 8. Multiple pressure rollers 9 are provided on the inner side of the first auxiliary ring 6 and the second auxiliary ring 7. The two sets of pressure rollers 9 are distributed at equal distances around the inner side of the first auxiliary ring 6 and the second auxiliary ring 7, respectively. The roller pressing auxiliary device also includes an auxiliary frame 15 provided on the outer side of each pressure roller 9. The pressure roller 9 is rotatably connected to the auxiliary frame 15 through the connecting shaft 17 fixedly connected on the outer side. Multiple pressure heads 18 are fixedly connected to the outer wall of the pressure roller 9. The multiple pressure heads 18 are distributed at equal distances around the outer wall of the pressure roller 9. Each pressure head 18 has a stepped surface 19 on its outer side. The fireproof and pressure-resistant rubber layer 23 is rolled into a stepped groove 22 through the stepped surface 19.

[0040] A device for cooling the newly extruded cable core 20 can be installed between the insulation material extruder 1 and the fireproof and pressure-resistant material extruder 2. After cooling and drying, the cable core 20 enters the insulation material extruder 1 for extrusion. This cooling and drying device is existing technology and is therefore not shown in this solution.

[0041] When the cable core 20 is being processed, the fire-resistant and pressure-resistant rubber layer 23 is extruded onto the outside of the cable core 20 through the mold 3 at the end of the fire-resistant and pressure-resistant material extruder 2. After cooling, the formed fire-resistant and pressure-resistant rubber layer 23 is then extruded onto the outside of the fire-resistant and pressure-resistant rubber layer 21 through the mold 3 at the end of the insulation material extruder 1. During this process, the stepped surface 19 on the outer wall of the pressure roller 9 directly contacts the freshly extruded fire-resistant and pressure-resistant rubber layer 23, achieving precise replication through roller pressing. The stepped groove 22 that matches the stepped surface is produced. Since the fireproof and pressure-resistant rubber layer is in a semi-softened state after extrusion, the roller pressing at this time can ensure that the stepped groove 22 has a regular shape and consistent size, avoiding the problems of difficult processing or poor molding after hardening. At the same time, through the multiple pressure rollers 9 distributed around and the pressure heads arranged at equal intervals, combined with the uniform movement of the cable core 20, the stepped groove 22 is distributed in a "stepped and equidistant" manner on the outside of the rubber layer, providing a uniform interlocking foundation for the subsequent extrusion and bonding of the insulating plastic layer 21, thereby improving the stability after extrusion molding.

[0042] During the extrusion process of the cable core 20 passing through the mold 3, the pressure head 18 abuts against the outside of the fire-resistant and pressure-resistant rubber layer 23. Then, the thrust generated by the movement of the cable core 20 pushes the pressure roller 9 to rotate circumferentially, forming a rolling operation. The distance between the pressure head 18 on the outside of the pressure roller 9 and the center of the fire-resistant and pressure-resistant rubber layer 23 is between the inner diameter and the outer diameter of the fire-resistant and pressure-resistant rubber layer 23 to facilitate abutment. When the cable core 20 passes through the inside of the mold 3 at the front end of the fire-resistant and pressure-resistant material extruder 2, the pressure head 18 on the outside of the second auxiliary ring 7 squeezes against the outside of the fire-resistant and pressure-resistant rubber layer 23, extruding the surface of the fire-resistant and pressure-resistant rubber layer 23 into multiple shapes. Each stepped groove 22 facilitates the extrusion of the insulating plastic layer 21 onto the outside of the fire-resistant and pressure-resistant rubber layer 23 by the insulating material extruder 1. The stepped groove 22 completely fills the recessed space during the extrusion of the insulating plastic layer 21, forming a "protrusion-recession" mechanical interlocking structure, which far exceeds the friction of flat bonding. This interlocking effectively resists external forces during cable bending, stretching, or long-term use, preventing the insulation layer and the fire-resistant and pressure-resistant rubber layer from shifting or falling off. After the two layers are tightly bonded, the protective function of the fire-resistant and pressure-resistant rubber layer 23 can be stably performed, and the pressure resistance and fire resistance will not be affected by the loosening between the layers, thereby improving the stability of the cable 4 after extrusion molding.

[0043] Please see Figure 4 The distance between the set of pressure rollers 9 on the inner side of the second auxiliary ring 7 and the outer wall of the fireproof and pressure-resistant rubber layer 23 is less than the distance between the set of pressure rollers 9 on the inner side of the first auxiliary ring 6 and the outer wall of the fireproof and pressure-resistant rubber layer 23.

[0044] Because the distance between the set of pressure rollers 9 on the inner side of the second auxiliary ring 7 and the outer wall of the fireproof and pressure-resistant rubber layer 23 is less than the distance between the set of pressure rollers 9 on the inner side of the first auxiliary ring 6 and the outer wall of the fireproof and pressure-resistant rubber layer 23, the fireproof and pressure-resistant rubber layer 23 that has just been extruded is initially rolled by the pressure head 18 on the inner side of the second auxiliary ring 7, and finally undergoes a final rolling operation through the fireproof and pressure-resistant rubber layer 23 on the inner side of the first auxiliary ring 6. The fireproof and pressure-resistant rubber layer 23 that has just been extruded is in a softened state, and direct strong rolling can easily lead to tearing, denting or cable core displacement. The initial rolling is first done by the second auxiliary ring 7 to define the contour, and then by the first auxiliary ring 6 to strengthen the rolling, dispersing the molding pressure and avoiding structural damage caused by one-time processing. Step-by-step rolling allows the rubber layer to slowly release internal stress during molding, reducing the risk of shrinkage and deformation during subsequent cooling or use. The stepped groove 22 has a stable shape, which can ensure that the insulating plastic layer 21 can be fully filled and interlocked after extrusion, avoiding the impact of interlayer bonding force due to deformation of the stepped groove.

[0045] Please see Figures 2-6The inner sides of both the first auxiliary ring 6 and the second auxiliary ring 7 are provided with adjustment components for adjusting the pressure roller 9. Each adjustment component includes multiple one-way threaded screws 13 rotatably connected to the inner sides of the second auxiliary ring 7 and the first auxiliary ring 6. Each one-way threaded screw 13 is correspondingly disposed on one side of an auxiliary frame 15, and each auxiliary frame 15 is threadedly connected to the outer wall of the one-way threaded screw 13. The adjustment component also includes a bevel gear ring 14 rotatably connected to the outer walls of the first auxiliary ring 6 and the second auxiliary ring 7. A bevel gear 11 is fixedly connected to the outer wall of each one-way threaded screw 13, and each bevel gear 11 meshes with the bevel gear ring 14. Multiple fixing frames 10 are fixedly connected to the outer walls of both the first auxiliary ring 6 and the second auxiliary ring 7. Each fixed frame 10 is correspondingly set on one side of a one-way threaded screw 13, and each one-way threaded screw 13 is rotatably connected to the end of the fixed frame 10. A drive motor 12 is installed at the end of one of the fixed frames 10 on the outer wall of the first auxiliary ring 6 and the second auxiliary ring 7, and the output end of the drive motor 12 is fixedly connected to the one-way threaded screw 13. Multiple suspension frames 16 are fixedly connected to the inner side of the first auxiliary ring 6 and the second auxiliary ring 7, and the multiple suspension frames 16 are respectively set on one side of an auxiliary frame 15. A limiting block is fixedly connected to one side of each auxiliary frame 15. A limiting groove matching the limiting block is opened on the inner side of the suspension frame 16. The auxiliary frame 15 is slidably connected to the suspension frame 16 through the limiting block fixedly connected to the outer wall.

[0046] When the roller pressure needs to be adjusted, the drive motor 12 is started. The output end of the drive motor 12 drives the one-way threaded screw 13 to rotate, which in turn drives the bevel gear ring 14 to rotate through a bevel gear 11. This drives other bevel gears 11 to drive one one-way threaded screw 13 to rotate synchronously, thereby adjusting the position of multiple auxiliary frames 15. This allows the distance between multiple pressure rollers 9 and the cable core 20 to be adjusted according to requirements, enabling the switching of production specifications and improving the equipment's versatility and production flexibility.

[0047] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fire-resistant and pressure-resistant cable, characterized in that, include: Cable core (20) and fire-resistant and pressure-resistant rubber layer (23) extruded on the outside; An insulating plastic layer (21) is formed by extrusion molding on the outside of the fireproof and pressure-resistant rubber layer (23). The cable core (20), the insulating plastic layer (21) and the fireproof and pressure-resistant rubber layer (23) are combined to form a cable (4). Stepped groove (22), the stepped groove (22) is provided on the outside of the fireproof and pressure-resistant rubber layer (23) to improve the fit between the insulating plastic layer (21) and the fireproof and pressure-resistant rubber layer (23).

2. The fire-resistant and pressure-resistant cable according to claim 1, characterized in that, Multiple stepped grooves (22) are provided, and the multiple stepped grooves (22) are distributed at equal intervals in a stepped manner on the outside of the fireproof and pressure-resistant rubber layer (23).

3. A fire-resistant and pressure-resistant cable production apparatus, characterized in that, include: An insulating material extruder (1) and a fire-resistant and pressure-resistant material extruder (2) disposed on one side of the insulating material extruder (1) extrude a fire-resistant and pressure-resistant rubber layer (23) onto the outside of the cable core (20) through the fire-resistant and pressure-resistant material extruder (2), and extrude an insulating plastic layer (21) onto the outside of the fire-resistant and pressure-resistant rubber layer (23) through the insulating material extruder (1); Mold (3), two molds (3) are provided, and the two molds (3) are respectively installed at the discharge port of the insulating material extruder (1) and the fireproof and pressure-resistant material extruder (2); A roller pressing aid, located at the end of one of the molds (3), is used to roll the surface of the fireproof and pressure-resistant rubber layer (23) to form a stepped groove (22).

4. The fire-resistant and pressure-resistant cable production device according to claim 3, characterized in that, The roller pressing auxiliary device includes a fixed frame (5) fixedly connected to the outer wall of one of the molds (3). A second auxiliary ring (7) is fixedly connected to the front end of the fixed frame (5). A first auxiliary ring (6) is fixedly connected to the front end of the second auxiliary ring (7) via a connecting rod (8). Multiple pressure rollers (9) are provided on the inner sides of both the first auxiliary ring (6) and the second auxiliary ring (7). The two sets of pressure rollers (9) are distributed at equal distances around the inner sides of the first auxiliary ring (6) and the second auxiliary ring (7). Adjustment components for adjusting the pressure rollers (9) are provided on the inner sides of both the first auxiliary ring (6) and the second auxiliary ring (7).

5. The fire-resistant and pressure-resistant cable production apparatus according to claim 4, characterized in that, The roller pressing auxiliary device also includes an auxiliary frame (15) disposed on the outside of each of the pressing rollers (9). The pressing rollers (9) are rotatably connected to the auxiliary frame (15) through a connecting shaft (17) fixedly connected to the outside. Multiple pressing heads (18) are fixedly connected to the outer wall of the pressing rollers (9). The multiple pressing heads (18) are distributed at equal distances around the outer wall of the pressing rollers (9).

6. The fire-resistant and pressure-resistant cable production apparatus according to claim 5, characterized in that, Each of the pressure heads (18) has a stepped surface (19) on its outer side, through which the fireproof and pressure-resistant rubber layer (23) is rolled into a stepped groove (22).

7. The fire-resistant and pressure-resistant cable production apparatus according to claim 6, characterized in that, The distance by which a set of pressure rollers (9) inside the second auxiliary ring (7) rolls against the outer wall of the fireproof and pressure-resistant rubber layer (23) is less than the distance by which a set of pressure rollers (9) inside the first auxiliary ring (6) rolls against the outer wall of the fireproof and pressure-resistant rubber layer (23).

8. The fire-resistant and pressure-resistant cable production apparatus according to claim 4, characterized in that, The adjustment assembly includes a plurality of one-way threaded screws (13) rotatably connected to the inner sides of the second auxiliary ring (7) and the first auxiliary ring (6). Each one-way threaded screw (13) is correspondingly disposed on one side of an auxiliary frame (15), and each auxiliary frame (15) is threadedly connected to the outer wall of the one-way threaded screw (13).

9. The fire-resistant and pressure-resistant cable production apparatus according to claim 8, characterized in that, The adjustment assembly further includes a bevel gear ring (14) rotatably connected to the outer walls of the first auxiliary ring (6) and the second auxiliary ring (7). Each one-way threaded screw (13) has a bevel gear (11) fixedly connected to its outer wall, and each bevel gear (11) meshes with the bevel gear ring (14). The outer walls of the first auxiliary ring (6) and the second auxiliary ring (7) are fixedly connected to multiple fixing frames (10). Each fixing frame (10) is correspondingly arranged on one side of one one-way threaded screw (13), and each one-way threaded screw (13) is rotatably connected to the end of the fixing frame (10). A drive motor (12) is installed at the end of one of the fixing frames (10) on the outer walls of the first auxiliary ring (6) and the second auxiliary ring (7), and the output end of the drive motor (12) is fixedly connected to the one-way threaded screw (13).

10. A fire-resistant and pressure-resistant cable production apparatus according to claim 9, characterized in that, Multiple suspension brackets (16) are fixedly connected to the inner sides of the first auxiliary ring (6) and the second auxiliary ring (7). Each of the multiple suspension brackets (16) is respectively arranged on one side of an auxiliary bracket (15). A limiting block is fixedly connected to one side of each auxiliary bracket (15). A limiting groove matching the limiting block is opened on the inner side of the suspension bracket (16). The auxiliary bracket (15) is slidably connected to the suspension bracket (16) through the limiting block fixedly connected to the outer wall.

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