Apparatus for suppressing fiber ribbon defects using vacuum pressure

Abstract

The device for suppressing defects of optical fiber cable by vacuum pressure comprises a cable structure, and a vacuum aluminum foil bag is arranged on the outer wall of the cable structure in a sleeving mode. The device for suppressing defects of optical fiber cable by vacuum pressure solves the problems of extrusion slip and cracks of the existing optical fiber cable in the process of heat curing and storage and transportation.

Description

Technical Field

[0001] This invention belongs to the technical field of fiber optic guided missile equipment, specifically relating to a device for suppressing defects in fiber optic coils using vacuum pressure. Background Technology

[0002] Fiber optic coils are a crucial component of fiber optic guidance technology. Optical fibers are wound onto a specially designed core tube using a winding machine to form fiber optic coils. These coils are installed at the tail of the missile, enabling bidirectional information transmission and precise missile control. The quality of the coils has a critical impact on the successful launch of fiber optic guided missiles.

[0003] A high-quality fiber coil should have neat unwinding at both the inner and outer ends, and dense fiber winding with no loose fiber turns on the surface. However, during the actual winding, subsequent curing, transportation, and storage of the fiber coil, various defects can occur due to different factors. For example, during thermosetting and low-temperature storage, when the fiber coil undergoes temperature changes, the mismatch in the thermal expansion coefficients of various internal materials and uneven temperature distribution throughout the coil can increase internal stress, causing the adhesive in some areas to crack and fail, resulting in defects such as cracks, extrusion, and interlayer slippage. These defects are generally difficult to repair directly. Severe defects can lead to unwinding or collapse of the fiber coil during the unwinding process, ultimately causing fiber-optic guided weapons to malfunction. Summary of the Invention

[0004] The purpose of this invention is to provide a device for suppressing defects in optical fiber coils using vacuum pressure, which solves the problems of extrusion slippage and cracks that occur in existing optical fiber coils during thermosetting and storage and transportation.

[0005] The technical solution adopted in this invention is a device for suppressing defects in optical fiber coils using vacuum pressure, comprising a coil structure, wherein a vacuum aluminum foil bag is vacuum-sealed on the outer wall of the coil structure.

[0006] The invention is further characterized by:

[0007] The coil structure includes a bottom end cap, a mandrel seat fixed to the inner wall of the bottom end cap, a mandrel, an adjusting layer and a coil sequentially fitted on the outer wall of the mandrel seat, a silicone rubber extrusion pad and a bottom pressure plate sequentially fitted on the outer wall of the mandrel seat, the silicone rubber extrusion pad being embedded in the mandrel seat, the mandrel and the adjusting layer being joined, the inner wall of the bottom pressure plate contacting the coil, a top pressure plate fitted on the outer wall of the coil at the end away from the mandrel seat, the inner wall of the top pressure plate having several grooves, the inner wall of the top pressure plate at the end away from the mandrel seat contacting the outer wall of the adjusting layer, a top end cap fixed to the end of the mandrel away from the mandrel seat, a silicone rubber connecting strip connected to the inner bottom surface of the bottom end cap, and the other end of the silicone rubber connecting strip being connected to the top end cap.

[0008] The inner wall of the bottom end cap is provided with several side air grooves along the circumferential direction. The bottom inner wall of the bottom end cap is provided with a bottom air groove ring, and several bottom air grooves are provided on the bottom air groove ring. The end face of the mandrel seat near the bottom end cap is in contact with the upper end face of the bottom air groove ring.

[0009] The bottom end cap has a bottom connecting frame on its inner bottom surface, which is connected to the silicone rubber connecting strip. The top end cap has a top connecting frame on its inner bottom surface, and the other end of the silicone rubber connecting strip is connected to the top connecting frame.

[0010] The outer wall of the mandrel seat is provided with a mandrel seat boss, which is in clearance fit with the inner wall of the bottom end cap.

[0011] One side of the surface of the silicone rubber extrusion pad is in contact with the outer wall of the mandrel seat. The other side of the surface of the silicone rubber extrusion pad is in contact with the end face of the adjustment layer near the mandrel seat and the bottom pressure plate, respectively. The other side of the surface of the silicone rubber extrusion pad is in contact with the outer wall of the end of the mandrel near the mandrel seat.

[0012] Both ends of the adjustment layer have circumferential bosses on their outer walls. The circumferential boss of the adjustment layer near the mandrel seat contacts the bottom pressure plate, and the circumferential boss of the adjustment layer away from the mandrel seat contacts the inner wall of the top pressure plate at the end away from the mandrel seat.

[0013] The top end cap wraps around the mandrel, and the top end cap is in contact with both side walls of the mandrel. The end face of the top end cap is in contact with the end face of the adjustment layer away from the mandrel seat.

[0014] The top end cap has several air vents.

[0015] The bottom pressure plate includes a left pressure plate and a right pressure plate. The inner walls of both the left and right pressure plates are provided with several grooves. Both the left and right pressure plates are in contact with the coil. A first connecting seat is provided at the junction of one side of the left and right pressure plates, and a second connecting seat is provided at the junction of the other side of the left and right pressure plates. A threaded hole is provided in the center of the first connecting seat, and a through hole is provided in the center of the second connecting seat. Fixing screws are provided in the threaded hole and the through hole.

[0016] The beneficial effects of this invention are:

[0017] The device for suppressing defects in optical fiber coils using vacuum pressure provided by this invention firstly utilizes atmospheric pressure in conjunction with a high-temperature resistant vacuum aluminum foil bag and ventilated end caps on both sides to achieve encapsulation and compression of the surface of the optical fiber coil, providing a large and stable pressure for an extended period. Secondly, simple initial installation and positioning are achieved using only fixing bolts, silicone rubber connecting strips, and silicone rubber compression pads, with final installation and positioning completed by encapsulating the fiber optic coil in the aluminum foil bag. This method occupies little space, is convenient to install, and does not require alteration to the original shape of the optical fiber coil. Finally, the pressure can be flexibly adjusted by changing the vacuum level inside the aluminum foil bag, and the pressure applied to the coil surface and its position can be adjusted by selecting a suitable inner groove shape and arrangement of pressure plates. This allows for more flexible suppression of the generation and spread of more serious defects based on the actual situation of the coil defects. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the device for suppressing defects in optical fiber coils using vacuum pressure, as per the present invention.

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a schematic diagram of the top end cap connection of the present invention;

[0021] Figure 4 This is a schematic diagram of the bottom pressure plate of the present invention.

[0022] In the diagram, 1. Mandrel seat, 101. Mandrel seat boss, 2. Mandrel, 3. Adjustment layer, 4. Coil, 5. Top end cap, 501. Top end cap vent, 502. Top connecting bracket, 6. Top pressure plate, 7. Bottom pressure plate, 701. Left pressure plate, 702. Right pressure plate, 703. Groove, 704. First connecting seat, 705. Second connecting seat, 706. Threaded hole, 707. Through hole, 8. Silicone rubber extrusion pad, 9. Bottom end cap, 901. Side air groove, 902. Bottom air groove ring, 903. Bottom air groove, 904. Bottom connecting bracket, 10. Silicone rubber connecting strip, 11. Fixing screw, 12. Vacuum aluminum foil bag. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] The device for suppressing fiber optic coil defects using vacuum pressure provided by this invention, such as... Figure 1 As shown, the device includes a coil structure, with a vacuum-sealed aluminum foil bag 12 fitted onto the outer wall of the coil structure. The vacuum aluminum foil bag 12 is selected as a high-temperature resistant round-bottom aluminum foil bag or a high-temperature resistant three-side-sealed flat-mouth aluminum foil bag that conforms to the external dimensions of the coil 4. Figure 2As shown, the coil structure includes a bottom end cap 9, with a mandrel seat 1 fixedly connected to the inner wall of the bottom end cap 9. A mandrel seat boss 101 is provided on the outer wall of the mandrel seat 1, and the mandrel seat boss 101 is clearance-fitted with the inner wall of the bottom end cap 9. A mandrel 2, an adjusting layer 3, and a coil 4 are sequentially fitted onto the outer wall of the mandrel seat 1. A silicone rubber extrusion pad 8 and a bottom pressure plate 7 are also sequentially fitted onto the outer wall of the mandrel seat 1. The silicone rubber extrusion pad 8 is embedded at the junction of the mandrel seat 1, the mandrel 2, and the adjusting layer 3. The inner wall of the bottom pressure plate 7 contacts the coil 4. A top pressure plate 6 is fitted onto the outer wall of the end of the coil 4 away from the mandrel seat 1. The inner wall of the top pressure plate 6 has several grooves. The inner wall of the end of the pressure plate 6 away from the mandrel seat 1 contacts the outer wall of the adjusting layer 3. The top end cap 5 is fixed to the end of the mandrel 2 away from the mandrel seat 1. A silicone rubber connecting strip 10 is connected to the bottom surface of the bottom end cap 9. The other end of the silicone rubber connecting strip 10 is connected to the top end cap 5. The bottom end cap 9 and the top end cap 5 are initially tightened by the silicone rubber connecting strip 10. The silicone rubber connecting strip 10 is made of high-temperature resistant and highly elastic silicone rubber. The length of the silicone rubber connecting strip 10 is slightly less than the distance between the bottom end cap 9 and the top end cap 5, providing a small tensile force and making installation less strenuous. Under atmospheric pressure, the vacuum aluminum foil bag 12 tightly adheres to the surface of the insulated package 4, providing stable pressure and completely fixing the wrapped parts. Under atmospheric pressure and the vacuum aluminum foil bag 12, the top pressure plate 6 and the bottom pressure plate 7 apply pressure to both sides of the coil 4. When there are no defects on the surface of the coil 4, the top pressure plate 6 and the bottom pressure plate 7 are tightly attached to the optical fibers of each layer, providing pressure perpendicular to the inclined plane and reducing the possibility of internal cracks and other defects. When defects such as protrusions or slippage occur on the surface of the coil 4, the pressure is concentrated on the optical fiber at the defect location through the top pressure plate 6 and the bottom pressure plate 7, preventing the generation of serious defects and their further expansion. Figure 3As shown, the inner wall of the bottom end cap 9 has several side air grooves 901 along the circumferential direction, and the bottom inner wall of the bottom end cap 9 has a bottom air groove ring 902 with several bottom air grooves 902 to facilitate air flow between the bottom and the top. The end face of the mandrel seat 1 near the bottom end cap 9 is in contact with the upper end face of the bottom air groove ring 902. The bottom surface of the bottom end cap 9 has a bottom connecting frame 904, which is connected to the silicone rubber connecting strip 10. The bottom surface of the top end cap 5 has a top connecting frame 502, and the other end of the silicone rubber connecting strip 10 is connected to the top connecting frame 502. One side of the surface of the silicone rubber extrusion pad 8 is in contact with the outer wall of the mandrel seat 1. One side of the surface of the silicone rubber extrusion pad 8 contacts the end face of the adjusting layer 3 near the mandrel seat 1 and the bottom pressure plate 7, respectively. One side of the surface of the silicone rubber extrusion pad 8 contacts the outer wall of the mandrel 2 near the mandrel seat 1. Both ends of the outer wall of the adjusting layer 3 are provided with circumferential bosses. The circumferential boss of the adjusting layer 3 near the mandrel seat 1 contacts the bottom pressure plate 7, and the circumferential boss of the adjusting layer 3 away from the mandrel seat 1 contacts the inner wall of the top pressure plate 6 away from the mandrel seat 1. The top end cap 5 wraps around the mandrel 2, and the top end cap 5 contacts both side walls of the mandrel 2. The end face of the top end cap 5 contacts the end face of the adjusting layer 3 away from the mandrel seat 1. The top end cap 5 is provided with several top end cap vents 501. Figure 4 As shown, the bottom pressure plate 7 includes a left pressure plate 701 and a right pressure plate 702. The inner walls of both the left pressure plate 701 and the right pressure plate 702 are provided with several grooves 703 to reduce the contact area between the inner side of the bottom pressure plate 7 and the coil 4 and increase the pressure at the contact point. Both the left pressure plate 701 and the right pressure plate 702 are in contact with the coil 4. A first connecting seat 704 is provided at the junction of one side of the left pressure plate 701 and the right pressure plate 702, and a second connecting seat 705 is provided at the junction of the other side of the left pressure plate 701 and the right pressure plate 702. A threaded hole 706 is provided in the center of the first connecting seat 704, and a through hole 707 is provided in the center of the second connecting seat 705. Fixing screws 11 are provided in the threaded hole 706 and the through hole 707.

[0025] The device for suppressing defects in optical fiber coils using vacuum pressure provided by this invention operates as follows: First, the silicone rubber connecting strip 10 is connected to the bottom connecting frame 904 for subsequent connection. The coil 4 is placed vertically on the bottom end cap 9, so that the bottom end cap 9 is tightly attached to the bottom of the mandrel seat 1 and the mandrel seat boss 101. Then, the left pressure plate 701 and the right pressure plate 702 are assembled. The first connecting seat 704 has a threaded hole 706 in the center, and the second connecting seat 705 has a through hole 707 in the center. The left pressure plate 701 and the right pressure plate 702 are joined together by fixing screws 11, and a high-temperature resistant silicone rubber extrusion pad 8 is embedded between the mandrel seat 1 and the adjusting layer 3, so that the bottom pressure plate 7 is initially close to the side of the coil 4, preventing misalignment and sliding of the bottom pressure plate 7 before or during vacuuming, and limiting excessive slippage of the adjusting layer 3 in the future. Then, install the top pressure plate 6, which, under gravity, conforms to the side of the coil 4 and the circumferential protrusion of the adjusting layer 3. Connect the top connecting frame 502 and the bottom connecting frame 904 using a high-temperature resistant and elastic silicone rubber connecting strip 10. Provide a small tensile force between the bottom end cap 9 and the top end cap 5. After connection, snap the top end cap 5 into the mandrel 2, so that the top end cap 5 abuts against the side wall of the mandrel 2 and the protrusion of the adjusting layer 3, achieving positioning and preventing the top end cap 5 from loosening or slipping before or during vacuuming. This completes the coil structure. Vertically insert the coil structure into a well-fitting vacuum aluminum foil bag 12. Finally, select a suitable vacuum sealing machine to evacuate and seal the vacuum aluminum foil bag 12.

[0026] Example 1

[0027] The device proposed in this embodiment for suppressing defects in optical fiber coils using vacuum pressure, such as... Figure 1 As shown, it includes a coil structure, and a vacuum aluminum foil bag 12 is vacuum-sealed on the outer wall of the coil structure.

[0028] Example 2

[0029] The device proposed in this embodiment for suppressing defects in optical fiber coils using vacuum pressure, such as... Figure 1 As shown, it includes a coil structure, and the outer wall of the coil structure is vacuum-sealed with a vacuum aluminum foil bag 12. Figure 2As shown, the coil structure includes a bottom end cap 9, a spindle seat 1 fixedly connected to the inner wall of the bottom end cap 9, a spindle seat boss 101 on the outer wall of the spindle seat 1, and a clearance fit between the spindle seat boss 101 and the inner wall of the bottom end cap 9; a spindle 2, an adjusting layer 3 and a coil 4 are sequentially fitted on the outer wall of the spindle seat 1, and a silicone rubber extrusion pad 8 and a bottom pressure plate 7 are also sequentially fitted on the outer wall of the spindle seat 1. The silicone rubber extrusion pad 8 is embedded in the junction of the spindle seat 1, the spindle 2 and the adjusting layer 3. The inner wall of the bottom pressure plate 7 is in contact with the coil 4. A top pressure plate 6 is fitted on the outer wall of the end of the coil 4 away from the spindle seat 1. The inner wall of the top pressure plate 6 has several grooves. The inner wall of the end of the top pressure plate 6 away from the spindle seat 1 is in contact with the outer wall of the adjusting layer 3. A top end cap 5 is fixedly connected to the end of the spindle 2 away from the spindle seat 1. A silicone rubber connecting strip 10 is connected to the bottom surface of the bottom end cap 9, and the other end of the silicone rubber connecting strip 10 is connected to the top end cap 5.

[0030] Example 3

[0031] The device proposed in this embodiment for suppressing defects in optical fiber coils using vacuum pressure, such as... Figure 1 As shown, it includes a coil structure, and the outer wall of the coil structure is vacuum-sealed with a vacuum aluminum foil bag 12. Figure 2 As shown, the coil structure includes a bottom end cap 9, a spindle seat 1 fixedly connected to the inner wall of the bottom end cap 9, a spindle seat boss 101 on the outer wall of the spindle seat 1, and a clearance fit between the spindle seat boss 101 and the inner wall of the bottom end cap 9; a spindle 2, an adjusting layer 3, and a coil 4 are sequentially fitted onto the outer wall of the spindle seat 1; a silicone rubber extrusion pad 8 and a bottom pressure plate 7 are also sequentially fitted onto the outer wall of the spindle seat 1; the silicone rubber extrusion pad 8 is embedded in the junction of the spindle seat 1, the spindle 2, and the adjusting layer 3; the inner wall of the bottom pressure plate 7 contacts the coil 4; a top pressure plate 6 is fitted onto the outer wall of the coil 4 at the end away from the spindle seat 1; the inner wall of the top pressure plate 6 has several grooves; the inner wall of the top pressure plate 6 at the end away from the spindle seat 1 contacts the outer wall of the adjusting layer 3; a top end cap 5 is fixedly connected to the end of the spindle 2 away from the spindle seat 1; a silicone rubber connecting strip 10 is connected to the bottom surface of the bottom end cap 9; the other end of the silicone rubber connecting strip 10 is connected to the top end cap 5. Figure 3As shown, the inner wall of the bottom end cover 9 has several side air grooves 901 along the circumferential direction, and the bottom inner wall of the bottom end cover 9 has a bottom air groove ring 902. Several bottom air grooves 903 are formed on the bottom air groove ring 902. One end face of the mandrel seat 1 near the bottom end cover 9 contacts the upper end face of the bottom air groove ring 902. A bottom connecting frame 904 is provided on the inner bottom surface of the bottom end cover 9, and the bottom connecting frame 904 is connected to the silicone rubber connecting strip 10. A top connecting frame 502 is provided on the inner bottom surface of the top end cover 5, and the other end of the silicone rubber connecting strip 10 is connected to the top connecting frame 502. One side of the surface of the silicone rubber extrusion pad 8 contacts the outer wall of the mandrel seat 1. One side of the surface of the pad 8 contacts the end face of the adjusting layer 3 near the mandrel seat 1 and the bottom pressure plate 7, respectively. One side of the surface of the silicone rubber extrusion pad 8 contacts the outer wall of the mandrel 2 near the mandrel seat 1. Both ends of the outer wall of the adjusting layer 3 are provided with circumferential bosses. The circumferential boss of the adjusting layer 3 near the mandrel seat 1 contacts the bottom pressure plate 7. The circumferential boss of the adjusting layer 3 away from the mandrel seat 1 contacts the inner wall of the top pressure plate 6 away from the mandrel seat 1. The top end cap 5 wraps around the mandrel 2. The top end cap 5 contacts both sides of the mandrel 2. The end face of the top end cap 5 contacts the end face of the adjusting layer 3 away from the mandrel seat 1. The top end cap 5 is provided with several top end cap vents 501.

[0032] Example 4

[0033] The device proposed in this embodiment for suppressing defects in optical fiber coils using vacuum pressure, such as... Figure 1 As shown, it includes a coil structure, and the outer wall of the coil structure is vacuum-sealed with a vacuum aluminum foil bag 12. Figure 2 As shown, the coil structure includes a bottom end cap 9, a spindle seat 1 fixedly connected to the inner wall of the bottom end cap 9, a spindle seat boss 101 on the outer wall of the spindle seat 1, and a clearance fit between the spindle seat boss 101 and the inner wall of the bottom end cap 9; a spindle 2, an adjusting layer 3 and a coil 4 are sequentially fitted on the outer wall of the spindle seat 1, and a silicone rubber extrusion pad 8 and a bottom pressure plate 7 are also sequentially fitted on the outer wall of the spindle seat 1. The silicone rubber extrusion pad 8 is embedded in the junction of the spindle seat 1, the spindle 2 and the adjusting layer 3. The inner wall of the bottom pressure plate 7 is in contact with the coil 4. A top pressure plate 6 is fitted on the outer wall of the end of the coil 4 away from the spindle seat 1. The inner wall of the top pressure plate 6 has several grooves. The inner wall of the end of the top pressure plate 6 away from the spindle seat 1 is in contact with the outer wall of the adjusting layer 3. A top end cap 5 is fixedly connected to the end of the spindle 2 away from the spindle seat 1. A silicone rubber connecting strip 10 is connected to the bottom surface of the bottom end cap 9, and the other end of the silicone rubber connecting strip 10 is connected to the top end cap 5. Under the combined action of atmospheric pressure and the vacuum aluminum foil bag 12, the top pressure plate 6 and the bottom pressure plate 7 apply pressure to both sides of the coil 4. If the diameter of the adjusting layer 3 is 110 mm, the diameter of the optical fiber is 0.36 mm, and it is wound with 70 layers, then the thickness of the coil 4 is approximately 21.87 mm. At this time, atmospheric pressure can provide a maximum force of approximately 900 N to the sides along the core cylinder axis. The specific applied pressure can be flexibly adjusted by controlling the vacuum level inside the vacuum aluminum foil bag 12 at the end of the vacuuming process. Figure 3 As shown, the inner wall of the bottom end cover 9 has several side air grooves 901 along the circumferential direction, and the bottom inner wall of the bottom end cover 9 has a bottom air groove ring 902. Several bottom air grooves 903 are formed on the bottom air groove ring 902. One end face of the mandrel seat 1 near the bottom end cover 9 contacts the upper end face of the bottom air groove ring 902. A bottom connecting frame 904 is provided on the inner bottom surface of the bottom end cover 9, and the bottom connecting frame 904 is connected to the silicone rubber connecting strip 10. A top connecting frame 502 is provided on the inner bottom surface of the top end cover 5, and the other end of the silicone rubber connecting strip 10 is connected to the top connecting frame 502. One side of the surface of the silicone rubber extrusion pad 8 contacts the outer wall of the mandrel seat 1. One side of the surface of the pad 8 contacts the end face of the adjusting layer 3 near the mandrel seat 1 and the bottom pressure plate 7, respectively. One side of the surface of the silicone rubber extrusion pad 8 contacts the outer wall of the end of the mandrel 2 near the mandrel seat 1. Both ends of the outer wall of the adjusting layer 3 are provided with circumferential bosses. The circumferential boss of the adjusting layer 3 near the mandrel seat 1 contacts the bottom pressure plate 7, and the circumferential boss of the adjusting layer 3 away from the mandrel seat 1 contacts the inner wall of the top pressure plate 6 away from the mandrel seat 1. The top end cap 5 covers the mandrel 2, and the top end cap 5 contacts both side walls of the mandrel 2. The end face of the top end cap 5 contacts the end face of the adjusting layer 3 away from the mandrel seat 1. The top end cap 5 is provided with several top end cap vents 501. Figure 4 As shown, the bottom pressure plate 7 includes a left pressure plate 701 and a right pressure plate 702. The inner walls of both the left pressure plate 701 and the right pressure plate 702 are provided with several grooves 703. Both the left pressure plate 701 and the right pressure plate 702 are in contact with the coil 4. A first connecting seat 704 is provided at the junction of one side of the left pressure plate 701 and the right pressure plate 702, and a second connecting seat 705 is provided at the junction of the other side of the left pressure plate 701 and the right pressure plate 702. A threaded hole 706 is provided in the center of the first connecting seat 704, and a through hole 707 is provided in the center of the second connecting seat 705. Fixing screws 11 are provided in the threaded hole 706 and the through hole 707.

Claims

1. An apparatus for suppressing fiber ribbon defects by vacuum pressure, characterized by, Includes a coil structure, wherein the outer wall of the coil structure is vacuum-sealed with a vacuum aluminum foil bag (12). The coil structure includes a bottom end cap (9), with a mandrel seat (1) fixedly connected to the inner wall of the bottom end cap (9). A mandrel (2), an adjusting layer (3), and a coil (4) are sequentially fitted onto the outer wall of the mandrel seat (1). A silicone rubber extrusion pad (8) and a bottom pressure plate (7) are also sequentially fitted onto the outer wall of the mandrel seat (1). The silicone rubber extrusion pad (8) is embedded in the mandrel seat (1), where the mandrel (2) and adjusting layer (3) meet. The inner wall of the bottom pressure plate (7) contacts the coil (4). 4) A top pressure plate (6) is fitted on the outer wall of the end away from the mandrel seat (1). The inner wall of the top pressure plate (6) is provided with several grooves. The inner wall of the top pressure plate (6) away from the mandrel seat (1) is in contact with the outer wall of the adjusting layer (3). A top end cap (5) is fixedly connected to the end of the mandrel (2) away from the mandrel seat (1). A silicone rubber connecting strip (10) is connected to the bottom surface of the bottom end cap (9). The other end of the silicone rubber connecting strip (10) is connected to the top end cap (5). The inner wall of the bottom end cap (9) is provided with a number of side air grooves (901) along the circumferential direction. The bottom inner wall of the bottom end cap (9) is provided with a bottom air groove ring (902). The bottom air groove ring (902) is provided with a number of bottom air grooves (903). The end face of the mandrel seat (1) near the bottom end cap (9) is in contact with the upper end face of the bottom air groove ring (902).

2. The apparatus for suppressing fiber ribbon defects by vacuum pressure according to claim 1, wherein, The bottom end cap (9) has a bottom connecting frame (904) on its inner bottom surface, which is connected to the silicone rubber connecting strip (10). The top end cap (5) has a top connecting frame (502) on its inner bottom surface, and the other end of the silicone rubber connecting strip (10) is connected to the top connecting frame (502).

3. The apparatus for suppressing fiber ribbon defects by vacuum pressure according to claim 2, wherein, The outer wall of the mandrel seat (1) is provided with a mandrel seat boss (101), and the mandrel seat boss (101) is in clearance fit with the inner wall of the bottom end cap (9).

4. The apparatus for suppressing optical fiber coil defects using vacuum pressure according to claim 3, characterized in that, One side of the surface of the silicone rubber extrusion pad (8) is in contact with the outer wall of the mandrel seat (1). One side of the surface of the silicone rubber extrusion pad (8) is in contact with the end face of the adjustment layer (3) near the mandrel seat (1) and the bottom pressure plate (7). One side of the surface of the silicone rubber extrusion pad (8) is in contact with the outer wall of the mandrel (2) near the mandrel seat (1).

5. The apparatus for suppressing optical fiber coil defects using vacuum pressure according to claim 4, characterized in that, The adjustment layer (3) has circumferential protrusions on both outer walls. The circumferential protrusion of the adjustment layer (3) near the mandrel seat (1) contacts the bottom pressure plate (7), and the circumferential protrusion of the adjustment layer (3) away from the mandrel seat (1) contacts the inner wall of the top pressure plate (6) away from the mandrel seat (1).

6. The apparatus for suppressing fiber ribbon defects by vacuum pressure according to claim 5, wherein, The top end cap (5) wraps around the mandrel (2), and the top end cap (5) is in contact with both sides of the mandrel (2). The end face of the top end cap (5) is in contact with the end face of the adjustment layer (3) away from the mandrel seat (1).

7. The apparatus for suppressing fiber ribbon defects by vacuum pressure according to claim 6, wherein The top end cap (5) is provided with several top end cap vents (501).

8. The apparatus for suppressing fiber ribbon defects by vacuum pressure according to claim 7, wherein, The bottom pressure plate (7) includes a left pressure plate (701) and a right pressure plate (702). The inner walls of the left pressure plate (701) and the right pressure plate (702) are provided with a number of grooves (703). The left pressure plate (701) and the right pressure plate (702) are in contact with the coil (4). A first connecting seat (704) is provided at the junction of one side of the left pressure plate (701) and the right pressure plate (702). A second connecting seat (705) is provided at the junction of the other side of the left pressure plate (701) and the right pressure plate (702). A threaded hole (706) is provided in the center of the first connecting seat (704). A through hole (707) is provided in the center of the second connecting seat (705). Fixing screws (11) are provided in the threaded hole (706) and the through hole (707).

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