Optical fiber coating mold

Abstract

The utility model discloses an optical fiber coating mold which comprises a lower mold assembly and an upper mold assembly, the lower mold assembly comprises a lower mold body, the upper mold assembly comprises an upper mold body, a coating cavity, a glue injection groove, a first exhaust groove and a second exhaust groove are formed on a mold closing surface between the lower mold body and the upper mold body, and the glue injection groove, the first exhaust groove and the second exhaust groove are respectively communicated with the coating cavity; the coating cavity extends in a first direction in the mold closing surface, and the first exhaust groove and the second exhaust groove are located on the two opposite sides of the glue injection groove; in the second direction of the mold closing surface, the first exhaust groove and the second exhaust groove extend from the first side of the coating cavity to the opposite second side; the depth of the first exhaust groove and the depth of the second exhaust groove in the joint face are several times to dozens of times smaller than the depth of the coating cavity. According to the scheme, bubbles in the glue solution injected into the coating cavity are extruded and discharged to the first exhaust groove and the second exhaust groove in the flowing process of the glue solution, so that bubbles generated on a coating layer can be reduced or even avoided, and the quality of the coating layer is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of optical fiber, specifically relates to a kind of optical fiber coating mould. BACKGROUND

[0002] Optical fiber is an important nonlinear optical medium, in the production process of optical fiber, need to set coating layer on the surface of bare optical fiber, for isolating external moisture, increase the mechanical strength of optical fiber and prevent the bending loss of optical fiber caused by external force etc..In some application scenarios of optical fiber, for example, optical fiber fusion, need to peel off coating layer after processing to optical fiber, re-coating treatment is carried out after processing is completed, the most common processing method is to use optical fiber coating machine to recoat optical fiber.

[0003] At present, optical fiber coating machine is provided with coating mould, coating mould is provided with circular cross-section coating cavity, first, after processing, the exposed part of optical fiber is placed in coating cavity, then coating material (usually ultraviolet curing glue) with certain refractive index is injected into coating cavity, then coating material is cured.The coating mould in the existing optical fiber coating machine, usually, semi-circular groove is arranged on upper die and lower die respectively, two semi-circular grooves form coating cavity when clamping, for example, Chinese patent application CN113617594A provides a kind of optical fiber automatic coating device, wherein the optical fiber clamping piece (i.e. coating mould) includes oppositely arranged first clamping piece and second clamping piece, semi-circular groove is arranged on the lamination surface of first clamping piece and second clamping piece and penetrates the lamination surface, and the upper and lower two semi-circular grooves form the accommodation cavity (i.e. coating cavity).It is found in actual application that the coating mould with this structure, when recoating optical fiber, coating layer is prone to bubble, and the appearance of coating layer may have defects such as bulge or depression, and the quality of coating layer needs to be improved. UTILITY MODEL CONTENTS

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a kind of optical fiber coating mould, solve how to reduce even avoid the problem of bubble in coating layer when coating optical fiber.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] An optical fiber coating mould, comprising a lower die assembly and an upper die assembly, the lower die assembly comprises a lower die body, the upper die assembly comprises an upper die body, and a coating cavity is formed on the clamping surface between the lower die body and the upper die body, and a glue injection groove, a first exhaust groove and a second exhaust groove are respectively communicated with the coating cavity;

[0007] The coating cavity extends in the first direction in the clamping surface, and in the first direction, the first exhaust groove and the second exhaust groove are located on opposite sides of the glue injection groove; in a second direction perpendicular to the first direction in the clamping surface, the first exhaust groove and the second exhaust groove extend from a first side to an opposite second side of the coating cavity respectively; the depth of the first exhaust groove and the second exhaust groove in the clamping surface is several to tens of times smaller than the depth of the coating cavity.

[0008] In a preferred scheme, the clamping surface includes a lower clamping surface located on the lower mold body and an upper clamping surface located on the upper mold body, a first circular-arc-face groove extending in the first direction is opened on the lower clamping surface, and a second circular-arc-face groove corresponding to the first circular-arc-face groove is opened on the upper clamping surface, the first circular-arc-face groove and the second circular-arc-face groove enclose the coating cavity with a circular cross section;

[0009] The first exhaust groove is opened on the lower clamping surface and communicates with the first circular-arc-face groove, or the first exhaust groove is opened on the upper clamping surface and communicates with the second circular-arc-face groove; the second exhaust groove is opened on the lower clamping surface and communicates with the first circular-arc-face groove, or the second exhaust groove is opened on the upper clamping surface and communicates with the second circular-arc-face groove.

[0010] In a preferred scheme, the first exhaust groove and the second exhaust groove are both opened on the upper clamping surface and respectively communicate with the second circular-arc-face groove, the glue injection groove is opened on the lower clamping surface and communicates with the first circular-arc-face groove, and the glue injection groove is provided with a glue injection port communicating with an external glue injection mechanism.

[0011] In a preferred scheme, the depth of the first exhaust groove and the second exhaust groove is 0.01mm-0.05mm respectively.

[0012] In a preferred scheme, the first exhaust groove and the second exhaust groove have the same shape, and in the first direction, the first exhaust groove and the second exhaust groove are mirror-symmetrically arranged on opposite sides of the glue injection groove.

[0013] In a preferred scheme, the first exhaust groove has an axisymmetric figure shape with an axis of the coating cavity as a symmetric axis, and the second exhaust groove has an axisymmetric figure shape with the axis of the coating cavity as a symmetric axis.

[0014] In a preferred solution, the width of the first exhaust groove gradually increases from one end close to the glue injection groove to the other end away from the glue injection groove, and the width of the second exhaust groove gradually increases from one end close to the glue injection groove to the other end away from the glue injection groove, with the size in the second direction being the width of the first and second exhaust grooves.

[0015] In a preferred solution, the lower mold assembly further comprises a lower mold base, and the lower mold body is connected to the lower mold base; the upper mold assembly further comprises an upper mold base, and the upper mold body is connected to the upper mold base; wherein,

[0016] The cross section of the lower mold body along the second direction is trapezoidal; in the second direction, the opposite sides of the lower mold body are respectively provided with first pressing strips extending along the first direction and having top pressing slopes corresponding to the side slopes of the lower mold body, the first pressing strips are fixedly connected to the lower mold base, and the top pressing slopes of the first pressing strips top press on the side slopes of the lower mold body to fix the lower mold body on the lower mold base; and / or,

[0017] The cross section of the upper mold body along the second direction is trapezoidal; in the second direction, the opposite sides of the upper mold body are respectively provided with second pressing strips extending along the first direction and having top pressing slopes corresponding to the side slopes of the upper mold body, the second pressing strips are fixedly connected to the upper mold base, and the top pressing slopes of the second pressing strips top press on the side slopes of the upper mold body to fix the upper mold body on the upper mold base.

[0018] In a preferred solution, the upper mold base is rotatably connected to the lower mold base; the lower mold base is provided with a first light transmission hole extending along the first direction and capable of allowing curing light to be incident on the coating cavity, and / or the upper mold base is provided with a second light transmission hole extending along the first direction and capable of allowing curing light to be incident on the coating cavity.

[0019] In a preferred solution, in the first direction, the opposite sides of the lower mold body are respectively provided with optical fiber guiding mechanisms connected to the lower mold base; the optical fiber guiding mechanism comprises a support part connected to the lower mold base and a guiding part protruding from one end of the support part, the support part is provided with an optical fiber accommodating groove coaxially arranged with the coating cavity, and the guiding part is provided with a V-shaped guiding groove communicating with the optical fiber accommodating groove.

[0020] The optical fiber coating mold provided by the embodiment of the utility model forms coating cavity and first exhaust groove and second exhaust groove communicated with coating cavity respectively on the mold closing surface between lower mold body and upper mold body, when coating optical fiber, the bubbles in glue solution (coating material) injected into coating cavity are extruded and discharged to first exhaust groove and second exhaust groove in the process of glue solution flowing, the glue solution in coating cavity solidifies to form coating layer, thus the bubbles in coating layer can be reduced or even avoided, and the quality of coating layer is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the optical fiber coating mold in the embodiment of the utility model in the mold closing state;

[0022] Figure 2 It is the sectional view of the optical fiber coating mold in the embodiment of the utility model in the mold closing state;

[0023] Figure 3 It is the structure schematic diagram of the optical fiber coating mold in the embodiment of the utility model in the mold opening state;

[0024] Figure 4 It is the structure schematic diagram of the lower mold assembly in the embodiment of the utility model;

[0025] Figure 5 It is the exploded view of the lower mold assembly in the embodiment of the utility model;

[0026] Figure 6 It is the structure schematic diagram of the lower mold body in the embodiment of the utility model;

[0027] Figure 7 It is the structure schematic diagram of the upper mold assembly in the embodiment of the utility model;

[0028] Figure 8 It is the exploded view of the upper mold assembly in the embodiment of the utility model;

[0029] Figure 9 It is the structure schematic diagram of the upper mold body in the embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantage of the utility model more clear, the specific embodiment of the utility model is explained in detail below with the help of the drawings. The example of these preferred embodiments is illustrated in the drawings. The embodiment of the utility model shown in the drawings and described according to the drawings is only exemplary, and the utility model is not limited to these embodiments.

[0031] It should be noted that the same or similar reference signs in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and therefore, the terms describing the positional relationships in the drawings cannot be understood as limiting the present patent, and the specific meanings of the above terms can be understood according to the specific circumstances by those of ordinary skill in the art.

[0032] It should be noted that, in order to avoid obscuring the present application due to unnecessary details, only the structures and / or processing steps closely related to the scheme according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0033] The optical fiber coating mold provided by the embodiment of the present application, referring to Figures 1 to 9 The optical fiber coating mold 1 comprises a lower mold assembly 11 and an upper mold assembly 12, the lower mold assembly 11 comprises a lower mold base 111 and a lower mold body 112 connected to the lower mold base 111, and the upper mold assembly 12 comprises an upper mold base 121 and an upper mold body 122 connected to the upper mold base 121.

[0034] In the embodiment, the lower mold assembly 11 and the upper mold assembly 12 are rotatably connected to each other through a rotating assembly 13, specifically, the lower mold base 111 and the upper mold base 121 are rotatably connected to each other through the rotating assembly 13. Through the rotating assembly 13, the rotation of the upper mold assembly 12 relative to the lower mold assembly 11 is controlled, thereby realizing the mold opening or closing of the optical fiber coating mold 1.

[0035] The mold closing surface between the lower mold body 112 and the upper mold body 122 is formed with a coating cavity 14, and an injection groove 113, a first exhaust groove 123 and a second exhaust groove 124 respectively communicating with the coating cavity 14. The coating cavity 13 extends in a first direction (such as the X direction in the figure) in the mold closing surface, and in the first direction, the first exhaust groove 123 and the second exhaust groove 124 are located on opposite sides of the injection groove 113. In a second direction (such as the Y direction in the figure) perpendicular to the first direction in the mold closing surface, the first exhaust groove 123 and the second exhaust groove 124 respectively extend from a first side of the coating cavity 14 to an opposite second side. In a third direction (such as the Z direction in the figure) perpendicular to the mold closing surface, the depth of the first exhaust groove 123 and the second exhaust groove 124 in the mold closing surface is several to several tens of times smaller than the depth of the coating cavity 14.

[0036] The coating cavity 14 is used to accommodate the optical fiber to be coated, the glue injection groove 113 receives glue (coating material) from an external glue injection mechanism and guides the glue into the coating cavity 14, and the bubbles in the glue are squeezed out to the first and second exhaust grooves 123 and 124 during the flow of the glue. The glue in the coating cavity 14 is solidified to form a coating layer, thereby reducing or even avoiding bubbles in the coating layer and improving the quality of the coating layer.

[0037] Referring to Figure 2 and Figure 3 , the mold closing surface includes a lower mold closing surface 115 of the lower mold body 112 and an upper mold closing surface 125 of the upper mold body 122. The lower mold closing surface 112 is provided with a first circular-arc-face groove 141 extending in the first direction, and the upper mold closing surface 125 is provided with a second circular-arc-face groove 142 corresponding to the first circular-arc-face groove 141, and the first and second circular-arc-face grooves 141 and 142 enclose the coating cavity 14 with a circular cross section. In this embodiment, the first and second circular-arc-face grooves 141 and 142 are semicircular grooves.

[0038] As a preferred solution, in this embodiment, the first and second exhaust grooves 123 and 124 are both provided in the upper mold closing surface 125 and communicate with the second circular-arc-face groove 142, and the glue injection groove 113 is provided in the lower mold closing surface 115 and communicates with the first circular-arc-face groove 141, and the glue injection groove 113 is provided with a glue injection port 114 communicating with an external glue injection mechanism (not shown in the figure). Based on the structure that the glue injection groove 113 is provided in the lower mold closing surface 115 and the first and second exhaust grooves 123 and 124 are both provided in the upper mold closing surface 125, the glue is injected from below, and in the coating cavity 14, the glue is easy to sink and the bubbles are easy to float, so that the bubbles in the glue can be more fully discharged to the first and second exhaust grooves 123 and 124 located relatively upwards. It is easy to understand that in some other embodiments, the first exhaust groove 123 can also be provided in the lower mold closing surface 115 and communicate with the first circular-arc-face groove 141, and the second exhaust groove 124 can also be provided in the lower mold closing surface 115 and communicate with the first circular-arc-face groove 141.

[0039] The specific depth of the first exhaust groove 123 and the second exhaust groove 124 in the mold closing surface needs to be set according to actual needs, and needs to consider that the requirements of exhaust can be met and overflow of glue is reduced as much as possible. Specifically, the depth of the first exhaust groove 123 and the second exhaust groove 124 is preferably set in the range of 0.01mm to 0.05mm.

[0040] As a preferred scheme, in the embodiment, the first exhaust groove 123 and the second exhaust groove 124 have the same shape, and in the first direction, the first exhaust groove 123 and the second exhaust groove 124 are mirror-symmetrically arranged on opposite sides of the glue injection groove 113. Therefore, the glue liquid introduced from the glue injection groove 113 can flow more uniformly to the coating cavity 14 on both sides of the glue injection groove 113. It should be noted that, in the embodiment, since the glue injection groove 113 is opened in the lower mold closing surface 115, and the first exhaust groove 123 and the second exhaust groove 124 are both opened in the upper mold closing surface 125, Figure 9 The projection position 113a of the glue injection groove 113 on the upper mold closing surface 125 in the mold closing state is shown by a dashed line.

[0041] The shape of the first exhaust groove 123 and the second exhaust groove 124 in the mold closing surface can be set as a regular shape, such as a rectangular shape, an oval shape, etc., or can be set as other irregular shapes. As a preferred scheme, the first exhaust groove 123 has an axisymmetric figure shape with the axis of the coating cavity 14 as the axis of symmetry, and the second exhaust groove 124 has an axisymmetric figure shape with the axis of the coating cavity 14 as the axis of symmetry. Specifically, referring to Figure 9 In the embodiment, the first exhaust groove 123 and the second exhaust groove 124 each have an axisymmetric figure shape with the axis of the second circular-arc-surface groove 142 as the axis of symmetry.

[0042] Further, referring to Figure 3 and Figure 9 The dimension in the second direction (Y direction) is the width of the first exhaust groove 123 and the second exhaust groove 124. The width of the first exhaust groove 123 gradually increases from one end close to the glue injection groove 113 to one end away from the glue injection groove 113, and the width of the second exhaust groove 124 gradually increases from one end close to the glue injection groove 113 to one end away from the glue injection groove 113. That is, the width of the first exhaust groove 123 and the second exhaust groove 124 gradually increases in the direction gradually away from the glue injection groove 113, which is beneficial to the glue liquid introduced from the glue injection groove 113 to flow to both ends of the coating cavity 14, and can make the finally formed coating layer more uniform.

[0043] It should be noted that in the prior art, the commonly used coating glue is ultraviolet curing glue. After the glue is injected into the coating cavity 14, ultraviolet light is irradiated to the coating cavity 14 to cure the glue in it to form a coating layer. Therefore, the lower die body 112 and the upper die body 122 are usually made of a practical light-transmitting material, and the most commonly used material is glass. In addition, the lower die body 112 is provided with a light-shielding coating on the area corresponding to the first circular arc groove 141 and the rest of the area. The upper die body 122 is provided with a light-shielding coating on the area corresponding to the second circular arc groove 142 and the rest of the area. Thus, the ultraviolet curing light irradiated from the outside can only enter the coating cavity 14.

[0044] In the existing coating mold, the lower die body and the upper die body are usually connected and fixed on the corresponding mold seat by punching holes on the lower die body and the upper die body and then fixed and connected by threaded fasteners. For example, the scheme disclosed in Chinese patent application CN113617594A in the background art section of the present application, see the attached Figure 3 and Figure 4 It can be seen that the first clamping member (corresponding to the lower die body) and the second clamping member (corresponding to the upper die body) are provided with holes near the four top corners, and the first clamping member and the second clamping member are fixed and connected with the corresponding mold seat through these holes. This connection method is easy to cause damage to the upper / lower die body, especially for the glass material upper / lower die body, which affects the service life of the mold.

[0045] In view of the above problems, the present application provides a coating mold, as shown in Figure 4 and Figure 5 The cross section of the lower die body 112 along the second direction (Y direction) is trapezoidal. In the second direction, the opposite sides of the lower die body 112 are respectively provided with first pressing strips 116, which extend along the first direction (X direction) and have top pressing inclined surfaces corresponding to the side inclined surfaces of the lower die body 112. The first pressing strips 116 are fixedly connected on the lower die seat 111, and the top pressing inclined surfaces of the first pressing strips 116 press on the side inclined surfaces of the lower die body 112 to fix the lower die body 112 on the lower die seat 111. Further, as shown in Figure 7 and Figure 8The upper die body 122 is trapezoidal in cross section in the second direction. In the second direction, opposite sides of the upper die body 122 are respectively provided with second pressing strips 126 extending in the first direction and having top pressing inclined surfaces corresponding to the side inclined surfaces of the upper die body 122. The second pressing strips 126 are fixedly connected to the upper die seat 121, and the top pressing inclined surfaces of the second pressing strips 126 press against the side inclined surfaces of the upper die body 122 to fix the upper die body 122 to the upper die seat 121. By the above fixing connection mode, on the one hand, the lower die body 112 and the upper die body 122 can be stably connected to the corresponding die seats, and on the other hand, holes can be avoided in the lower die body 112 and the upper die body 122, thereby improving the service life of the die.

[0046] Further, in the embodiment, the lower die seat 111 is provided with a first light transmission hole 117 extending in the first direction and capable of allowing curing light to be incident on the coating cavity 14, and the upper die seat 121 is provided with a second light transmission hole 127 extending in the first direction and capable of allowing curing light to be incident on the coating cavity 14. By respectively providing the first light transmission hole 117 and the second light transmission hole 127 on both sides of the coating cavity 14, when ultraviolet curing is performed, ultraviolet light can be irradiated from both sides at the same time to perform double-sided curing, thereby improving the curing efficiency and having better curing effect. Of course, in another alternative embodiment, only the first light transmission hole 117 or only the second light transmission hole 127 can be provided.

[0047] Further, in the embodiment, in the lower die assembly 11, opposite sides of the lower die body 112 in the first direction are respectively provided with optical fiber guiding mechanisms 118 connected to the lower die seat 111. The optical fiber guiding mechanism 118 includes a support portion 1181 connected to the lower die seat 111 and a guiding portion 1182 protruding from one end of the support portion 1181. The support portion 1181 is provided with an optical fiber accommodating groove 1183 coaxially arranged with the coating cavity 14, and the guiding portion 1182 is provided with a V-shaped guiding groove 1184 communicating with the optical fiber accommodating groove 1183. By providing the optical fiber guiding mechanism 118, when the optical fiber to be coated is placed in the lower die assembly 11, the V-shaped guiding groove 1184 can smoothly guide the optical fiber into the optical fiber accommodating groove 1183, and the optical fiber accommodating groove 1183 coaxially arranged with the coating cavity 14 can ensure that the optical fiber is accurately placed in the coating cavity 14, thereby avoiding damage caused by misplacement.

[0048] The above description is only a specific implementation of the present application. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. An optical fiber coating die comprising a lower die assembly and an upper die assembly, characterized in that, The lower die assembly comprises a lower die body, the upper die assembly comprises an upper die body, and a mold closing surface between the lower die body and the upper die body is formed with a coating cavity and glue injection grooves, first exhaust grooves and second exhaust grooves respectively communicating with the coating cavity; The coating cavity extends in a first direction in the mold closing surface, and in the first direction, the first exhaust grooves and the second exhaust grooves are located on opposite sides of the glue injection groove; in a second direction perpendicular to the first direction in the mold closing surface, the first exhaust grooves and the second exhaust grooves respectively extend from a first side of the coating cavity to an opposite second side; the depth of the first exhaust grooves and the second exhaust grooves in the mold closing surface is several to several tens of times smaller than the depth of the coating cavity.

2. The optical fiber coating die of claim 1, wherein, The mold closing surface comprises a lower mold closing surface on the lower die body and an upper mold closing surface on the upper die body, the lower mold closing surface is provided with a first circular arc surface groove extending in the first direction, and the upper mold closing surface is provided with a second circular arc surface groove corresponding to the first circular arc surface groove, the first circular arc surface groove and the second circular arc surface groove form the coating cavity with a circular cross section; The first exhaust grooves are provided on the lower mold closing surface and communicate with the first circular arc surface groove, or the first exhaust grooves are provided on the upper mold closing surface and communicate with the second circular arc surface groove; the second exhaust grooves are provided on the lower mold closing surface and communicate with the first circular arc surface groove, or the second exhaust grooves are provided on the upper mold closing surface and communicate with the second circular arc surface groove.

3. The optical fiber coating die of claim 2, wherein, The first exhaust grooves and the second exhaust grooves are both provided on the upper mold closing surface and respectively communicate with the second circular arc surface groove, the glue injection groove is provided on the lower mold closing surface and communicates with the first circular arc surface groove, and the glue injection groove is provided with a glue injection port communicating with an external glue injection mechanism.

4. The optical fiber coating die of claim 2, wherein, The depth of the first exhaust grooves and the second exhaust grooves is 0.01mm-0.05mm.

5. The optical fiber coating die of claim 2, wherein, The first exhaust grooves and the second exhaust grooves have the same shape, and in the first direction, the first exhaust grooves and the second exhaust grooves are mirror-symmetrically arranged on opposite sides of the glue injection groove.

6. The optical fiber coating die of any of claims 1-5, wherein, The first exhaust grooves have an axisymmetric figure shape with the axis of the coating cavity as the axis of symmetry, and the second exhaust grooves have an axisymmetric figure shape with the axis of the coating cavity as the axis of symmetry.

7. The optical fiber coating die of claim 6, wherein, The size in the second direction is the width of the first exhaust grooves and the second exhaust grooves, the width of the first exhaust grooves gradually increases from one end close to the glue injection groove to one end away from the glue injection groove, and the width of the second exhaust grooves gradually increases from one end close to the glue injection groove to one end away from the glue injection groove.

8. The optical fiber coating die of claim 1, wherein, The lower die assembly further comprises a lower die seat, and the lower die body is connected to the lower die seat; the upper die assembly further comprises an upper die seat, and the upper die body is connected to the upper die seat; wherein, The lower die body is trapezoidal in cross section along the second direction; opposite sides of the lower die body are respectively provided with first pressing strips extending along the first direction and having top pressing slopes corresponding to side slopes of the lower die body, the first pressing strips being fixedly connected to the lower die seat, the top pressing slopes of the first pressing strips pressing on the side slopes of the lower die body to fix the lower die body on the lower die seat; and / or, The upper die body is trapezoidal in cross section along the second direction; opposite sides of the upper die body are respectively provided with second pressing strips extending along the first direction and having top pressing slopes corresponding to side slopes of the upper die body, the second pressing strips being fixedly connected to the upper die seat, the top pressing slopes of the second pressing strips pressing on the side slopes of the upper die body to fix the upper die body on the upper die seat.

9. The optical fiber coating die of claim 8, wherein, The upper die seat is rotatably connected to the lower die seat; the lower die seat is provided with a first light transmission hole extending along the first direction and capable of allowing curing light to be incident on the coating cavity, and / or the upper die seat is provided with a second light transmission hole extending along the first direction and capable of allowing curing light to be incident on the coating cavity.

10. The optical fiber coating die of claim 8, wherein, In the first direction, opposite sides of the lower die body are respectively provided with optical fiber guiding mechanisms connected to the lower die seat; the optical fiber guiding mechanisms comprise support portions connected to the lower die seat and guiding portions protruding from one end of the support portions, the support portions are provided with optical fiber accommodating grooves coaxially arranged with the coating cavity, and the guiding portions are provided with V-shaped guiding grooves communicating with the optical fiber accommodating grooves.

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