Manufacturing device and manufacturing method of extruded insulation fire-resistant power cable

Abstract

The application discloses a manufacturing device and manufacturing method of extrusion insulated fire-resistant power cable, and relates to the technical field of cable production. The device comprises a cooling line and a workpiece, and further comprises a clamping mechanism and a rolling mechanism. The clamping mechanism comprises a closed frame sleeved on the workpiece, a sliding sleeve sleeved on the closed frame, a fixed plate fixedly connected to the inside of the opening side of the closed frame towards the workpiece, and a rotating ring rotatably installed in the closed frame. The clamping mechanism is arranged to flow the outer sheath layer to both sides under the extrusion of the clamping block, thereby filling the gap between the outer sheath layer and the inner core layer, sealing the front end of the workpiece, preventing moisture from entering the workpiece, and stopping the clamping mechanism in the rolling mechanism. The clamping mechanism is driven by a transmission structure to rotate quickly, thereby driving the nearby airflow to blow and dry the water droplets on the surface of the workpiece, ensuring the surface of the workpiece to be dry in the subsequent marking process, and ensuring the marking effect.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, specifically to a manufacturing apparatus and method for extruded insulated fire-resistant power cables. Background Technology

[0002] When extruding the outer sheath of a cable, the modified material is first heated to a viscous state using an injection molding machine. This viscous material is then injected into the extrusion mold. Simultaneously, the unextruded end of the cable passes through the mold and is pulled by a steel cable. As the cable moves and the injection molding machine continues to feed material, the viscous PVC material wraps around the cable. The extruded portion then passes through a water-cooling tank, where cold water cools the outer sheath, causing it to shrink and adhere to the cable surface, completing the cable extrusion process. After extrusion, the cable needs to be marked with its model number (e.g., laser marking, inkjet marking). This requires the cable surface to be free of moisture and water stains to ensure the clarity and durability of the markings.

[0003] In existing technologies, mechanical wiping is commonly used to remove moisture from the cable surface, essentially using a sponge to absorb the moisture. However, this design has a problem: after frequent squeezing, the sponge's internal pore structure gradually collapses, the fibers lose elasticity, leading to a decrease in its water absorption capacity and a significant reduction in its lifespan. This necessitates frequent inspection and cleaning of this area, affecting continuous cable production. Hot air drying, on the other hand, makes it difficult to cool the extruded outer sheath layer, resulting in poor concentricity between the outer sheath and inner core layer during traction, thus affecting cable quality. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for manufacturing extruded insulated fire-resistant power cables, so as to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a manufacturing apparatus for extruded insulated fire-resistant power cables, comprising a cooling line and a workpiece, wherein the cooling line includes a frame and a water tank, and further comprises:

[0006] A clamping mechanism includes a closed frame sleeved on the workpiece, a sliding sleeve slidably sleeved on the closed frame, a fixed plate fixedly connected inside the closed frame facing the opening side of the workpiece, a rotating ring rotatably installed inside the closed frame, a guide plate fixedly connected to the front end of the rotating ring, and a plurality of clamping blocks provided on the front side of the guide plate. When the clamping blocks are in the converged state, the clamping ends abut against the plastic layer of the workpiece.

[0007] A roller pressing mechanism, comprising a mounting frame fixedly connected to a machine frame, a fixed housing fixedly connected to the mounting frame, a roller frame fixedly mounted on the fixed housing, and two rubber rollers disposed inside the roller frame;

[0008] When the closed frame abuts against the side of the mounting frame, the clamping end of the clamping block moves away from the workpiece.

[0009] Preferably, the side of the fixing plate is provided with a plurality of through guide grooves I, the side of the guide plate is provided with a through guide groove II, and the side of the clamping block is fixedly connected with sliding column I and sliding column II. The sliding column II passes through the guide groove II and is slidably connected in the guide groove I, and the sliding column I is slidably connected in the guide groove II.

[0010] Preferably, the outer side of the closed frame is provided with multiple straight sliding grooves, and the inner side of the sliding sleeve is fixedly connected with multiple sliding plates. The sliding plates are slidably connected in the straight sliding grooves, and a push spring is elastically connected between the side of the sliding plate away from the clamping block and the inner side of the straight sliding groove to push the sliding plate to move towards the clamping block.

[0011] Preferably, a blocking plate that moves radially along the closed frame is slidably connected in the straight slide groove, and one side of the blocking plate is set as an inclined surface so that the sliding sleeve is blocked by the blocking plate when it is pushed back by the push spring.

[0012] Preferably, both sides of the blocking plate are provided with inclined notches, and an unlocking frame with its front end pointing towards the inclined notch is slidably connected inside the closed frame. One side of the unlocking frame is located on the side of the closed frame facing the mounting frame. After the unlocking frame moves into the closed frame, it pushes the blocking plate to move so that the blocking plate no longer contacts the sliding plate.

[0013] Preferably, the inner side of the sliding sleeve is fixedly connected to a plurality of drive columns, and the outer side of the rotating ring is provided with a plurality of arc grooves. The drive columns are slidably connected in the arc grooves. When the sliding sleeve moves away from the clamping block, the plurality of clamping blocks move toward a converged state and clamp the workpiece. When the sliding sleeve moves toward a closer state to the clamping block, the plurality of clamping blocks move toward an open state and release the workpiece.

[0014] Preferably, the two rubber rollers are arranged vertically, and a right-angle split gearbox is fixedly connected to the top surface of the fixed shell. A drive motor with an output shaft connected to the input shaft of the right-angle split gearbox is fixedly installed inside the fixed shell. Output shafts are provided on the top and side surfaces of the right-angle split gearbox, and the side output shaft of the right-angle split gearbox is connected to one of the rubber rollers for transmission.

[0015] Preferably, a rotating frame is rotatably mounted inside the mounting frame, and multiple trigger blocks are fixedly provided on the side of the rotating frame facing the clamping mechanism. A passive gear is fixedly sleeved on the side of the rotating frame adjacent to the roller frame.

[0016] Preferably, a speed-increasing gearbox is fixedly connected to the top surface of the fixed shell, the input end of the speed-increasing gearbox is connected to the output shaft of the right-angle split gearbox, and a driving gear is fixedly sleeved on the output shaft of the speed-increasing gearbox. The driving gear and the driven gear are connected by gear transmission.

[0017] A method for manufacturing an extruded insulated fire-resistant power cable includes the following steps:

[0018] S1: Clamp the clamping mechanism onto the workpiece and clamp the traction cable of the traction mechanism on the outside of the workpiece;

[0019] S2: The traction mechanism drives the workpiece to move and cools the outer sheath of the extrusion package through the water tank;

[0020] S3: One side of the clamping mechanism abuts against the side of the mounting bracket, and the trigger block pushes the unlocking bracket so that the clamping mechanism no longer clamps the workpiece;

[0021] S4: After the workpiece moves into the roller frame, fix the upper rubber roller;

[0022] S5: Start the motor inside the fixed housing to drive the rubber roller to rotate.

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

[0024] In this invention, the clamping mechanism causes the outer sheath layer to flow to both sides under the pressure of the clamping block, thereby filling the gap between the outer sheath layer and the inner core layer and sealing the front end of the workpiece. This eliminates the need to lift the front end of the workpiece after it is pulled into the water tank to prevent moisture from entering. As the clamping mechanism contacts the roller pressing mechanism, it switches from a closed state to an open state. The workpiece continues to move under the traction of the traction mechanism, while the clamping mechanism remains within the roller pressing mechanism. The roller pressing mechanism is then driven to roll the workpiece, and a transmission structure drives the clamping mechanism to rotate rapidly, thereby driving nearby airflow to blow away and dry the water droplets on the workpiece surface. This ensures the workpiece surface remains dry during the subsequent marking process, thus guaranteeing the marking effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the clamping mechanism of the present invention driving the cable into the mounting frame;

[0027] Figure 3 This is a schematic diagram of the clamping mechanism of the present invention;

[0028] Figure 4This is a partial exploded view of the clamping mechanism of the present invention;

[0029] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 This is a schematic diagram of a portion of the clamping mechanism of the present invention;

[0031] Figure 7 This is a schematic diagram of the enclosed frame structure of the present invention;

[0032] Figure 8 This is a schematic diagram of the roller pressing mechanism of the present invention;

[0033] Figure 9 This is a schematic diagram of the rolling mechanism of the present invention from another perspective.

[0034] In the diagram: 1. Cooling line; 11. Frame; 12. Water tank; 2. Workpiece; 3. Clamping mechanism; 31. Enclosed frame; 311. Straight slide groove; 312. Baffle plate; 313. Unlocking frame; 32. Sliding sleeve; 321. Slide plate; 322. Push spring; 323. Drive column; 33. Fixed plate; 331. Guide groove one; 34. Rotating ring; 341. Arc groove; 35. Guide plate; 351. Guide groove two; 36. Clamping block; 361. Slide column one; 362. Slide column two; 4. Roller pressing mechanism; 41. Mounting frame; 42. Rotating frame; 421. Trigger block; 43. Fixed shell; 44. Roller frame; 441. Rubber roller; 45. Right-angle split gearbox; 46. Speed-increasing gearbox; 47. Drive gear; 48. Driven gear. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figures 1 to 9 As shown in the figure, an embodiment of the present invention provides a manufacturing apparatus for extruded insulated fire-resistant power cables, including a cooling line 1 and a workpiece 2. The cooling line 1 includes a frame 11 and a water tank 12, and further includes:

[0037] The clamping mechanism 3 includes a closed frame 31 sleeved on the workpiece 2, a sliding sleeve 32 slidably sleeved on the closed frame 31, a fixed plate 33 fixedly connected inside the closed frame 31 facing the opening side of the workpiece 2, a rotating ring 34 rotatably installed inside the closed frame 31, a guide plate 35 fixedly connected to the front end of the rotating ring 34, and a plurality of clamping blocks 36 provided on the front side of the guide plate 35. When the clamping blocks 36 are in the gathered state, the clamping end abuts against the plastic layer of the workpiece 2.

[0038] The roller pressing mechanism 4 includes a mounting frame 41 fixedly connected to the frame 11, a fixed housing 43 fixedly connected to the mounting frame 41, a roller frame 44 fixedly mounted on the fixed housing 43, and two rubber rollers 441 disposed inside the roller frame 44.

[0039] When the closed frame 31 abuts against the side of the mounting frame 41, the clamping end of the clamping block 36 moves away from the workpiece 2.

[0040] In this invention, a sealing rubber sleeve is fitted at the interface between the outer sheath layer and the inner core layer of the workpiece 2. When the clamping block 36 is in the retracted state, it abuts against the sealing rubber sleeve, thereby preventing water in the water tank 12 from flowing into the gap between the outer sheath layer and the inner core layer.

[0041] In this invention, the shape of the clamping block 36 can be selected according to the actual parameters of the workpiece 2.

[0042] In this invention, the clamping mechanism 3 is positioned on the workpiece 2 at the beginning of the extrusion process, with the clamping block 36 resting on the outer sheath layer. Then, the sliding sleeve 32 is pushed, causing the guide plate 35 to move the clamping block 36 towards the outer sheath layer, thus compressing it. Under the pressure of the clamping block 36, this portion of the outer sheath layer flows to both sides, filling the gap between the outer sheath layer and the inner core layer, sealing the front end of the workpiece 2. Therefore, after the workpiece 2 is subsequently pulled into the water tank 12, it is not necessary to lift the front end of the workpiece 2 to prevent water from entering it. As the clamping mechanism 3 comes into contact with the rolling mechanism 4, the clamping block 36 switches from the gathered state of clamping the workpiece 2 to the open state of releasing the workpiece 2 under the push drive of the push spring 322. At this time, the workpiece 2 continues to move under the traction of the traction mechanism, while the clamping mechanism 3 remains in the rolling mechanism 4. Then, as the rolling mechanism 4 is driven to roll the workpiece 2, the clamping mechanism 3 is driven to rotate rapidly through the transmission structure, thereby driving the nearby airflow to blow away and dry the water droplets on the surface of the workpiece 2, thereby ensuring that the surface of the workpiece 2 is dry in the subsequent marking process, thus ensuring the marking effect.

[0043] In this embodiment, the side of the fixing plate 33 is provided with a plurality of through guide grooves 331, the side of the guide plate 35 is provided with a through guide groove 351, and the side of the clamping block 36 is fixedly connected with a sliding column 361 and a sliding column 362. The sliding column 362 passes through the guide groove 351 and is slidably connected in the guide groove 331, and the sliding column 361 is slidably connected in the guide groove 351.

[0044] like Figures 2 to 6As shown, the fixed plate 33, guide plate 35 and clamping block 36 are conventional opening and closing mechanisms. As the guide plate 35 rotates, the clamping block 36 performs gathering and opening actions under the guidance and limiting action of guide groove 1 331 and guide groove 2 351. Thus, in the gathered state, the clamping block 36 clamps the outer sheath layer of the workpiece 2, while in the open state, the workpiece 2 can move freely through the clamping mechanism 3.

[0045] In this embodiment, the outer side of the enclosure 31 is provided with a plurality of straight sliding grooves 311, and the inner side of the sliding sleeve 32 is fixedly connected with a plurality of sliding plates 321. The sliding plates 321 are slidably connected in the straight sliding grooves 311. A push spring 322 is elastically connected between the side of the sliding plate 321 away from the clamping block 36 and the inner side of the straight sliding groove 311 to push the sliding plate 321 to move towards the clamping block 36. A blocking plate 312 that moves radially along the enclosure 31 is slidably connected in the straight sliding groove 311. One side of the blocking plate 312 is set as an inclined surface so that when the sliding sleeve 32 is pushed back by the push spring 322, it is blocked by the blocking plate 312. Both sides of the blocking plate 312 are provided with inclined notches. An unlocking frame 313 with its front end pointing towards the inclined notch is slidably connected in the enclosure 31. One side of the unlocking frame 313 is located on the side of the enclosure 31 facing the mounting frame 41. After the unlocking frame 313 moves into the enclosure 31, it pushes the blocking plate 312 to move so that the blocking plate 312 no longer contacts the sliding plate 321.

[0046] like Figure 5 and Figure 7 As shown, when the sliding sleeve 32 is pulled to move away from the clamping block 36, due to the inclined surface on the blocking plate 312, the movement of the sliding plate 321 in this direction will squeeze and push the blocking plate 312 to slide into the closed frame 31, so that the sliding plate 321 is not blocked by the blocking plate 312. As the sliding plate 321 is no longer in contact with the blocking plate 312, the spring on the bottom surface of the blocking plate 312 will push it to extend again, so that the blocking plate 312 abuts against the sliding plate 321 from the side. At this time, the sliding plate 321 cannot move, so the clamping mechanism 3 is in a clamping state, thereby ensuring the clamping stability of the workpiece 2 when it is pulled by the traction device.

[0047] When the clamping mechanism 3 is pulled by the traction mechanism along with the workpiece 2, causing one side of the closed frame 31 to abut against the side of the rotating frame 42, as the closed frame 31 moves, the unlocking frame 313 is pushed inward by the trigger block 421, thereby causing the unlocking frame 313 to push the blocking plate 312 towards the axis of the closed frame 31. Since the blocking plate 312 is no longer in contact with the slide plate 321, the push spring 322 pushes the slide plate 321 to drive the sliding sleeve 32 to move towards the clamping block 36. As the sliding sleeve 32 slides, guided by the arc groove 341 and the drive column 323, the rotating ring 34 drives the guide plate 35 to rotate. At this time, the guide plate 35 drives the clamping mechanism to rotate. Block 36 switches from a retracted state to an open state, so that the side of the clamping block 36 no longer abuts against the surface of the workpiece 2. At this time, the workpiece 2 can continue to move with the traction of the traction mechanism, while the clamping mechanism 3 stays on the side of the mounting frame 41 of the roller pressing mechanism 4. Thus, the clamping mechanism 3 separates from the workpiece 2 after leaving the water tank 12. This seals the gap between the outer sheath layer and the inner core layer of the workpiece 2 when the workpiece 2 begins to enter the water tank 12, ensuring that water does not enter the interior of the outer sheath layer after the front end of the workpiece 2 enters the water tank 12, and ensuring that the sheath layer does not bulge after cooling and shrinking, so that the extrusion production of the outer sheath layer meets the production standards.

[0048] In this embodiment, a plurality of drive posts 323 are fixedly connected to the inner side of the sliding sleeve 32, and a plurality of arc grooves 341 are opened on the outer side of the rotating ring 34. The drive posts 323 are slidably connected in the arc grooves 341. When the sliding sleeve 32 moves away from the clamping block 36, the plurality of clamping blocks 36 move toward the converged state and clamp the workpiece 2. When the sliding sleeve 32 moves toward the clamping block 36, the plurality of clamping blocks 36 move toward the open state and release the workpiece 2.

[0049] By pulling the sliding sleeve 32 away from the clamping block 36, the sliding sleeve 32 drives the rotating ring 34 and the guide plate 35 to rotate, thereby causing the clamping block 36 to switch from the initial open state to the closed state. At this time, the clamping block 36 clamps the workpiece 2, thereby ensuring that the clamping mechanism 3 can move synchronously with the workpiece 2 when the traction mechanism is pulling the workpiece 2, thus sealing the front end of the workpiece 2. At the same time, the traction rope of the traction mechanism is clamped in the clamping mechanism 3, which can prevent the traction rope from falling off when pulling the workpiece 2, thereby ensuring the stability of traction.

[0050] In this embodiment, two rubber rollers 441 are arranged vertically. A right-angle split gearbox 45 is fixedly connected to the top surface of the fixed housing 43. A drive motor with an output shaft connected to the input shaft of the right-angle split gearbox 45 is fixedly installed inside the fixed housing 43. Output shafts are provided on the top and side surfaces of the right-angle split gearbox 45. The side output shaft of the right-angle split gearbox 45 is connected to a rubber roller 441 for transmission.

[0051] When extruding the outer sheath of cables, using a water tank 12 to cool the outer sheath can cause the outer temperature of the outer sheath to be lower than the inner temperature, which can easily lead to residual stress. If these stresses are not properly handled, they may cause the outer sheath to wrinkle, deform, or crack, affecting its long-term performance and reliability. At the same time, the wrinkled surface is also not conducive to subsequent laser marking. Therefore, the outer sheath is usually rolled to help eliminate stress. In addition, using a rubber roller 441 to roll the outer sheath can also repair the small depressions and bubble marks on the surface after cooling, which is more conducive to the cable achieving a high production qualification rate.

[0052] In this embodiment, a rotating frame 42 is rotatably mounted inside the mounting frame 41. Multiple trigger blocks 421 are fixedly provided on the side of the rotating frame 42 facing the clamping mechanism 3. A passive gear 48 is fixedly sleeved on the side of the rotating frame 42 adjacent to the roller frame 44. A speed-increasing gearbox 46 is fixedly connected to the top surface of the fixed shell 43. The input end of the speed-increasing gearbox 46 is connected to the output shaft on the top surface of the right-angle split gearbox 45. A driving gear 47 is fixedly sleeved on the output shaft of the speed-increasing gearbox 46. The driving gear 47 and the passive gear 48 are connected by gear transmission.

[0053] After the clamping mechanism 3, along with the workpiece 2, is pulled into the rotating frame 42 of the roller pressing mechanism 4 by the traction mechanism, the trigger block 421 pushes the unlocking frame 313 to unlock the sliding sleeve 32. At this time, the sliding sleeve 32 returns under the push of the return spring 322, thereby driving the clamping block 36 to switch from the gathered state to the open state. At this time, the workpiece 2 can continue to move with the traction of the traction mechanism, while the clamping mechanism 3 remains in the rotating frame 42. At this time, as the drive motor in the fixed shell 43 starts to work, the rubber roller 441 rolls the outer sheath layer, thereby releasing the stress inside the outer sheath layer and repairing the minor defects on the surface of the outer sheath layer. At this time, as the speed-increasing gear... The drive gear 48 of the wheel box 46 rotates at high speed, thereby driving the rotating frame 42 to rotate at high speed. At this time, since the trigger block 421 is inserted into the closed frame 31, the rotating frame 42 drives the entire clamping mechanism 3 to rotate at high speed (the clamping mechanism 3 is fixed relative to the rotating frame 42 by setting an elastic element on the inner side of the rotating frame 42 and setting a groove on the outer side of the sliding sleeve 32, which is a conventional structural setting and will not be described in detail here). At this time, the high-speed rotation of the clamping mechanism 3 will agitate the air in the vicinity to increase its flow rate, thereby drying the water droplets on the surface of the outer sheath layer, so that the workpiece 2 is dry before entering the laser marking stage, ensuring the accuracy of laser marking.

[0054] This invention also provides a method for manufacturing an extruded insulated fire-resistant power cable, which is carried out using the aforementioned extruded insulated fire-resistant power cable manufacturing apparatus, and specifically includes the following steps:

[0055] S1: Clamp the clamping mechanism 3 onto the workpiece 2, and clamp the traction cable of the traction mechanism on the outside of the workpiece 2;

[0056] S2: The traction mechanism drives the workpiece 2 to move and cools the outer sheath of the extrusion package through the water tank 12;

[0057] S3: One side of the clamping mechanism 3 abuts against the side of the mounting bracket 41, and the trigger block 421 pushes the unlocking bracket 313 so that the clamping mechanism 3 no longer clamps the workpiece 2;

[0058] S4: After workpiece 2 moves into the roller frame 44, fix the upper rubber roller 441;

[0059] S5: Start the motor inside the fixed housing 43 to drive the rubber roller 441 to rotate.

[0060] Therefore, the manufacturing method of extruded insulated fire-resistant power cable provided by the present invention should also have the effects brought about by the above-mentioned manufacturing device for extruded insulated fire-resistant power cable, which will not be described in detail.

[0061] Working principle:

[0062] When using this equipment to produce insulated fire-resistant power cables, firstly, after the inner core layer of the cable passes through the extrusion die, the traction rope of the traction mechanism passes through the clamping mechanism 3 and is tied to the inner core layer of the cable. Next, the clamping mechanism 3 is placed at the boundary between the outer sheath layer and the inner core layer. Then, the sliding sleeve 32 is pulled, causing it to drive the clamping block 36 to move, thus clamping the workpiece 2 from the outer sheath layer. Following the traction of the traction mechanism, the front end of the workpiece 2 enters the water tank 12 for cooling. At this time, the clamping mechanism 3 clamps and blocks the boundary of the cable to prevent water in the water tank 12 from entering along the gap between the inner core layer and the outer sheath layer. Then, as the workpiece 2 is continuously pulled by the traction mechanism, when the clamping mechanism 3 enters the rolling mechanism 4... After entering the rotating frame 42, the sliding sleeve 32 is unlocked under the relative push of the trigger block 421. Thus, driven by the push spring 322, the clamping block 36 switches from the gathered state of clamping the workpiece 2 to the open state of releasing the workpiece 2. At this time, the workpiece 2 is continued to be pulled by the traction mechanism to move. When the workpiece 2 enters the roller frame 44, the rubber roller 441 is driven to rotate. At this time, under the transmission of the right angle split gear box 45 and the speed-increasing gear box 46, the passive gear 48 drives the rotating frame 42 to rotate at high speed, thereby driving the clamping mechanism 3 to rotate at high speed. At this time, the airflow driven by the clamping mechanism 3 will blow away and dry the water droplets on the surface of the workpiece 2, thereby ensuring the dryness of the surface of the workpiece 2.

[0063] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A manufacturing apparatus for extruded insulated fire-resistant power cables, comprising a cooling line (1) and a workpiece (2), wherein the cooling line (1) comprises a frame (11) and a water tank (12), characterized in that, Also includes: The clamping mechanism (3) includes a closed frame (31) sleeved on the workpiece (2), a sliding sleeve (32) slidably sleeved on the closed frame (31), a fixed plate (33) fixedly connected inside the closed frame (31) facing the opening side of the workpiece (2), a rotating ring (34) rotatably installed inside the closed frame (31), a guide plate (35) fixedly connected to the front end of the rotating ring (34), and a plurality of clamping blocks (36) provided on the front side of the guide plate (35). When the clamping blocks (36) are in the converged state, the clamping end abuts against the plastic layer of the workpiece (2). Roller pressing mechanism (4), the roller pressing mechanism (4) includes a mounting frame (41) fixedly connected to the frame (11), a fixed shell (43) fixedly connected to the mounting frame (41), a roller frame (44) fixedly provided on the fixed shell (43), and two rubber rollers (441) provided inside the roller frame (44). When the closed frame (31) abuts against the side of the mounting frame (41), the clamping end of the clamping block (36) moves away from the workpiece (2). When the workpiece (2) is first extruded, the clamping mechanism (3) is placed on the workpiece (2) so that the clamping block (36) is on the outer sheath layer. Then, the sliding sleeve (32) is pushed so that the guide plate (35) drives the clamping block (36) to move towards the outer sheath layer and squeeze the outer sheath layer. At this time, under the squeezing of the clamping block (36), this part of the outer sheath layer flows to both sides, thereby filling the gap between the outer sheath layer and the inner core layer and sealing the front end of the workpiece (2). The mounting bracket (41) has a rotating bracket (42) rotatably mounted inside. The rotating bracket (42) has multiple trigger blocks (421) fixed on the side facing the clamping mechanism (3). A passive gear (48) is fixedly sleeved on the side of the rotating bracket (42) adjacent to the roller frame (44). The top surface of the fixed shell (43) is fixedly connected to a speed-increasing gearbox (46). The input end of the speed-increasing gearbox (46) is connected to the output shaft of the right-angle split gearbox (45). The output shaft of the speed-increasing gearbox (46) is fixedly sleeved with a driving gear (47). The driving gear (47) and the driven gear (48) are connected by gear transmission.

2. The manufacturing apparatus for extruded insulated fire-resistant power cables according to claim 1, characterized in that: The side of the fixed plate (33) is provided with a plurality of through guide grooves 1 (331), the side of the guide plate (35) is provided with a through guide groove 2 (351), the side of the clamping block (36) is fixedly connected with sliding column 1 (361) and sliding column 2 (362), the sliding column 2 (362) passes through the guide groove 2 (351) and is slidably connected in the guide groove 1 (331), and the sliding column 1 (361) is slidably connected in the guide groove 2 (351).

3. The manufacturing apparatus for extruded insulated fire-resistant power cables according to claim 1, characterized in that: The outer side of the closed frame (31) is provided with multiple straight slide grooves (311), and the inner side of the sliding sleeve (32) is fixedly connected with multiple slide plates (321). The slide plates (321) are slidably connected in the straight slide grooves (311). The side of the slide plate (321) away from the clamping block (36) is elastically connected to the inner side of the straight slide groove (311) with a push spring (322) to push the slide plate (321) to move towards the clamping block (36).

4. The manufacturing apparatus for extruded insulated fire-resistant power cables according to claim 3, characterized in that: A blocking plate (312) that moves radially along the closed frame (31) is slidably connected in the straight slide groove (311). One side of the blocking plate (312) is set as an inclined surface so that the slide sleeve (32) is blocked by the blocking plate (312) when it is pushed back by the push spring (322).

5. The manufacturing apparatus for extruded insulated fire-resistant power cables according to claim 4, characterized in that: Both sides of the blocking plate (312) are provided with sloping notches. The unlocking frame (313) with its front end pointing to the sloping notch is slidably connected inside the closed frame (31). One side of the unlocking frame (313) is located on the side of the closed frame (31) facing the mounting frame (41). After the unlocking frame (313) moves into the closed frame (31), it pushes the blocking plate (312) to move so that the blocking plate (312) no longer contacts the sliding plate (321).

6. The manufacturing apparatus for extruded insulated fire-resistant power cables according to claim 1, characterized in that: Multiple drive columns (323) are fixedly connected to the inner side of the sliding sleeve (32), and multiple arc grooves (341) are opened on the outer side of the rotating ring (34). The drive columns (323) are slidably connected in the arc grooves (341). When the sliding sleeve (32) moves away from the clamping block (36), the multiple clamping blocks (36) move toward the converged state and clamp the workpiece (2). When the sliding sleeve (32) moves toward the clamping block (36), the multiple clamping blocks (36) move toward the open state and release the workpiece (2).

7. The manufacturing apparatus for extruded insulated fire-resistant power cables according to claim 1, characterized in that: The two rubber rollers (441) are arranged vertically. A right-angle split gearbox (45) is fixedly connected to the top surface of the fixed shell (43). A drive motor with an output shaft connected to the input shaft of the right-angle split gearbox (45) is fixed inside the fixed shell (43). Output shafts are provided on the top and side surfaces of the right-angle split gearbox (45). The side output shaft of the right-angle split gearbox (45) is connected to one of the rubber rollers (441) in a transmission connection.

8. A method for manufacturing an extruded insulated fire-resistant power cable, based on the manufacturing apparatus for an extruded insulated fire-resistant power cable as described in claim 5, characterized in that, Includes the following steps: S1: Clamp the clamping mechanism (3) onto the workpiece (2) and clamp the traction cable of the traction mechanism on the outside of the workpiece (2); S2: The traction mechanism drives the workpiece (2) to move and cools the outer sheath of the extrusion package through the water tank (12); S3: One side of the clamping mechanism (3) abuts against the side of the mounting bracket (41), and the trigger block (421) pushes the unlocking bracket (313) so that the clamping mechanism (3) no longer clamps the workpiece (2). S4: After the workpiece (2) moves into the roller frame (44), the rubber roller (441) above it is fixed. S5: Start the motor inside the fixed housing (43) to drive the rubber roller (441) to rotate.

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