Optical fiber sheath extrusion system and process

Abstract

The present application relates to an optical fiber sheath extrusion system and its process, wherein the system includes an extruder and a cooling water trough, wherein guide wheels are arranged at both ends of the cooling water trough, a support is arranged in the cooling water trough, an optical fiber is overlapped on the support, the support is made of a high thermal conductivity material, the upper part of the support protrudes above the liquid level in the cooling water trough, and the lower part is sunk below the liquid level in the cooling water trough; a downpipe arranged along the length direction of the support is arranged above the cooling water trough, and a water supply assembly is arranged between the downpipe and the cooling water trough; a plurality of downholes are arranged at the lower part of the downpipe, and the water flowing out of the plurality of downholes converges above the support to form a water curtain. The present application uses a water curtain to cool and reduce the temperature of the optical fiber on the support in a flowing manner, thereby ensuring the temperature control consistency of the optical fiber output from the extruder when it is shaped by cooling water; and the cooling water trough does not need to be arranged long, which can well save the floor space occupied by the extrusion system in the factory; at the same time, the water consumption is small and the refrigeration load is small.

Description

Technical Field

[0001] The present application relates to the technical field of optical fiber extrusion processing equipment, and in particular to an optical fiber sheath extrusion system and a process thereof. Background Art

[0002] Optical fiber is a technology that uses light waves to transmit information. Its core is the optical fiber conductor, which is mainly composed of three parts: core, cladding and outer sheath. The core is usually made of high-purity silica glass and its function is to transmit optical signals. The outer sheath is used to protect the optical fiber from environmental influences. It is mainly made of plastic raw materials such as polyethylene (PE), polyvinyl chloride (PVC) or polypropylene (PP), which are melted and extruded and wrapped around the outer periphery of the optical fiber to form a sheath. The extruded optical fiber sheath needs to be quickly cooled by a water tank or cooling device to solidify it and maintain its shape.

[0003] At present, long water troughs are basically used as cooling equipment in production lines. The optical fiber that passes through the extruder and is extruded into the sheath passes through the water trough. The optical fiber is cooled and shaped by the heat exchange between a large amount of cooling water in the water trough and the optical fiber. The equipment is simple, easy to maintain, and has a low cost of use.

[0004] However, the long water tank occupies a large area in the factory, and the cooling water in the water tank is in contact with the environment in a large area. In the hot season, the indoor temperature in the factory is high, and it is difficult to efficiently cool the cooling water in the water tank, which will affect the cooling speed of the optical fiber. Therefore, it is necessary not only to increase the water supply, but also to set up auxiliary cooling or refrigeration equipment to control the cooling water temperature, which increases the water consumption and power consumption, but increases the cost of use, which is not conducive to the energy-saving production of optical fiber. Summary of the invention

[0005] In order to improve the problem that a long water tank cannot cool the optical fiber in an efficient and energy-saving manner when the room temperature is high, the present application provides an optical fiber sheath extrusion system and a process thereof.

[0006] The first aspect of the present application provides an optical fiber sheath extrusion system that adopts the following technical solution:

[0007] An optical fiber sheath extrusion system comprises an extruder and a cooling water tank arranged at one side of an extrusion head of the extruder, wherein guide wheels for guiding optical fibers are arranged at both ends of the cooling water tank, a support platform is arranged in the cooling water tank along its length direction, and optical fibers passing through the two guide wheels at both ends are overlapped on the support platform, the support platform is made of a high thermal conductivity material, and the upper part of the support platform protrudes above the liquid level in the cooling water tank, and the lower part is sunk below the liquid level in the cooling water tank;

[0008] A downpipe is arranged above the cooling water trough along the length direction of the support platform, and a water supply component for conveying low-temperature water to the downpipe is arranged between the downpipe and the cooling water trough;

[0009] A plurality of water drop holes are provided at the lower part of the downpipe, and water flowing out of the plurality of water drop holes converges above the support platform to form a water curtain.

[0010] Furthermore, the upper end surface of the support platform has a smooth groove arranged along its length direction, and the thickness of the water curtain below the downpipe is smaller than the width of the groove.

[0011] Furthermore, the upper end surface of the support platform has a smooth groove arranged along its length direction, and the thickness of the water curtain below the downpipe is smaller than the width of the groove.

[0012] Furthermore, a plurality of hollow portions are arranged in an array on the water curtain plate, and a plurality of teeth arranged along the length direction of the water curtain plate are fixedly connected to the bottom of the water curtain plate.

[0013] Furthermore, a refrigerant is encapsulated in the water curtain plate, and the water curtain plate can be detachably installed below the downpipe.

[0014] Furthermore, a transition slope is provided on the upper end surface of the support platform close to one end of the extruder, the end of the transition slope close to the middle of the support platform is the higher end, and at least half of the transition slope is submerged below the liquid level of the cooling water tank.

[0015] Furthermore, a plurality of heat conducting members extending to the bottom of the cooling water trough are fixedly connected to the bottom of the support platform, and the heat conducting members are used to conduct heat on the support platform to cooling water at the bottom of the cooling water trough.

[0016] Furthermore, the support platform is provided with a plurality of drainage holes spaced apart along the length direction thereof on the groove wall, and the drainage holes are arranged throughout the thickness direction of the support platform.

[0017] Furthermore, both ends of the support platform are provided with limit blocks for limiting the optical fiber from falling out of the groove.

[0018] The second aspect of the present application provides an optical fiber sheath extrusion process using the following technical solution:

[0019] An optical fiber sheath extrusion process, based on the above optical fiber sheath extrusion system, comprises the following steps:

[0020] S1. The sheath raw material is put into the extruder for hot melting, and the optical fiber is passed through the extrusion head of the extruder, the optical fiber wrapped in the sheath passes through the two guide wheels, and the middle portion thereof is overlapped on the platform;

[0021] S2. Water is supplied to the downpipe through the water supply assembly, so that the cooling water in the downpipe flows down from the multiple downpipe holes and forms a water curtain to continuously flush the optical fiber on the support platform, thereby efficiently cooling the optical fiber with the flowing cooling water.

[0022] In summary, the beneficial technical effects of this application are:

[0023] 1. The optical fiber passes through the support in the cooling water tank, and the water curtain formed by the continuous outflow of water from the multiple water holes on the downpipe can cool the optical fiber on the support in a flowing manner, which can ensure the temperature control consistency of the optical fiber output from the extruder when it is shaped by the cooling water. It can effectively avoid the temperature control deviation caused by the inconsistent water temperature before and after the optical fiber passes directly in the cooling water in the conventional technology, and ensure the extrusion molding quality of the optical fiber sheath of the same batch;

[0024] 2. The water curtain cools the optical fiber in a flowing manner. This cooling method is highly efficient and can make the optical fiber reach the set molding temperature faster. Therefore, the cooling water tank does not need to be set up for a long time, which can well save the floor space of the extrusion system in the factory. At the same time, there is no need to circulate a large amount of cooling water, which can reduce water consumption and reduce the refrigeration load when necessary, and the economy is more significant.

[0025] 3. By setting a water curtain plate under the downpipe, a good guiding effect can be formed for the water curtain under the multiple downspouts, so that the water curtain can accurately fall on the optical fiber in the groove, which is beneficial to reduce the thickness of the water curtain to reduce the amount of circulating water, and can also prevent the water curtain from shaking and breaking due to the influence of external airflow;

[0026] 4. The hollow part and teeth are arranged on the water curtain plate, which helps to reduce the thickness of the water curtain while maintaining the continuity of the water curtain. The teeth can break the surface tension of the water curtain flowing down from the bottom of the water curtain plate to ensure the integrity of the water curtain strip formed under the water curtain plate.

[0027] 5. By encapsulating the refrigerant in the water curtain plate and pre-freezing it before use, the water curtain can be cooled by the frozen refrigerant in the water curtain plate. There is no need to install refrigeration equipment in the water supply component. Only the frozen water curtain plate needs to be replaced manually, which can reduce the refrigeration cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the structure of the embodiment of the present application mainly used to show the water drop hole;

[0030] Figure 3 It is a schematic diagram of the longitudinal section structure of an embodiment of the present application;

[0031] Figure 4 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Extruder;

[0034] 2. Cooling water tank; 21. Guide wheel;

[0035] 3. Capping platform; 31. Groove; 32. Transition slope; 33. Heat conducting member; 34. Drain hole; 35. Limit block;

[0036] 4. Downpipe; 41. Downhole; 42. Connecting groove;

[0037] 5. water curtain plate; 51. hollow portion; 52. tooth portion;

[0038] 61. Water storage tank; 62. Water pump;

[0039] 71. T-block; 72. T-slot. DETAILED DESCRIPTION

[0040] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0041] The present application embodiment discloses an optical fiber sheath extrusion system, referring to Figure 1 , Figure 2 and Figure 3 , which includes an extruder 1 and a cooling water trough 2 arranged on one side of the extrusion head of the extruder 1, and in order to reduce the heat conduction between the cooling water trough 2 and the indoor environment, the cooling water trough 2 should be made of heat-insulating material or a heat-insulating layer should be arranged on the outer wall. Both ends of the cooling water trough 2 are provided with guide wheels 21 for guiding the optical fiber, and the guide wheels 21 are specifically groove wheels; a support platform 3 is arranged along its length direction in the cooling water trough 2, and the optical fiber passing through the two guide wheels 21 at both ends is overlapped on the support platform 3, specifically, the upper edge of the guide wheel 21 is flush with the upper end surface of the support platform 3. In addition, the support platform 3 is made of high thermal conductivity material, such as aluminum alloy, stainless steel, etc., but the part of the support platform 3 that contacts the optical fiber must be a smooth surface to reduce the probability of scratching the optical fiber sheath. The upper part of the support platform 3 protrudes above the liquid level in the cooling water trough 2, and the lower part is sunk below the liquid level in the cooling water trough 2.

[0042] In addition, a downpipe 4 is arranged above the cooling water trough 2 along the length direction of the pedestal 3. The length of the downpipe 4 is not greater than the length of the pedestal 3. A plurality of downpipe holes 41 are opened at the lower part of the downpipe 4. The plurality of downpipe holes 41 are arranged at equal intervals along the length direction of the downpipe 4. Water flowing out of the plurality of downpipe holes 41 converges above the pedestal 3 to form a water curtain; wherein, two adjacent downpipe holes 41 may be connected or not connected. If connected, the width of the connecting groove 42 between the two shall be smaller than the diameter of the downpipe hole 41, so as to ensure the stability and continuity of the formed water curtain to the greatest extent.

[0043] A water supply component for conveying low-temperature water to the downpipe 4 is provided between the downpipe 4 and the cooling water trough 2; the water supply component can directly circulate the cooling water in the lower layer of the cooling water trough 2 to the downpipe 4, or can first appropriately cool or refrigerate the upper layer of the cooling water in the cooling water trough 2 before conveying it to the downpipe 4, and the specific configuration can be configured according to the actual indoor temperature; or, in another feasible embodiment, a water storage tank 61 connected to the downpipe 4 can be further provided above the downpipe 4, and the cooling water in the cooling water trough 2 can be conveyed to the water storage tank 61 by means of a water pump 62 in the water supply component, and the cooling water in the water storage tank 61 flows out from the downhole 41 under its own gravity, which can not only ensure the stability of the water curtain, but also suspend the water supply component when there is sufficient water in the water storage tank 61 to save energy.

[0044] After such arrangement, when the optical fiber passes through the extrusion head of the extruder 1, the extruder 1 extrude the molten plastic raw material and wrap it around the outer periphery of the optical fiber to form a sheath, and then the optical fiber wrapped with the sheath is overlapped on two guide wheels 21 and passes through the cooling water tank 2. During this period, the optical fiber passes on the support platform 3 in the cooling water tank 2, and the water supply component continuously delivers low-temperature cooling water to the downpipe 4, so that the multiple downhole holes 41 on the downpipe 4 continuously flow out water and converge into a water curtain above the support platform 3. The water curtain can perform flowing water cooling and cooling on the optical fiber on the support platform 3, which can ensure the consistency of temperature control of the optical fiber output from the extruder 1 when it is shaped by cooling water, and can effectively avoid the deviation of shaping temperature control caused by inconsistent water temperature before and after the optical fiber passes directly in the cooling water in conventional technology, and can ensure the extrusion molding quality of the optical fiber sheaths of the same batch.

[0045] Furthermore, since the water curtain cools the optical fiber in a flowing manner, this cooling method is highly efficient and can enable the optical fiber to reach the set molding temperature more quickly. Therefore, the cooling water tank 2 does not need to be set longer, which can greatly save the floor space of the extrusion system in the factory. At the same time, there is no need to circulate a large amount of cooling water, which can not only reduce water consumption, but also reduce the refrigeration load when necessary, and the economy is more significant.

[0046] Specifically, refer to Figure 3 and Figure 4, in order to ensure the stable cooling effect of the water curtain on the optical fiber passing through the support platform 3.

[0047] On the one hand, there is a smooth groove 31 arranged along the length direction on the upper end surface of the support 3, and the thickness of the water curtain under the downpipe 4 is less than the width of the groove 31. In this way, while the water curtain cools the optical fiber in a flowing manner, the falling water flow also converges in the groove 31, which can also immerse the optical fiber, further improving the cooling effect on the optical fiber; at the same time, the setting of the groove 31 also increases the contact area between the support 3 and the water curtain, so that the support 3 can also be cooled by the water curtain and controlled in a lower temperature rise range as much as possible, so as to prevent the cooling water in the cooling water tank 2 from heating up after a long period of operation and affecting the heat-conducting support 3.

[0048] On the other hand, a vertically arranged water curtain plate 5 is installed below the downpipe 4, and there is a gap between the water curtain plate 5 and the upper end surface of the support platform 3, and the thickness of the water curtain plate 5 is smaller than the diameter of the downhole 41. In this way, under the action of the water curtain plate 5, a good guiding effect can be formed for the water curtain below the multiple downholes 41, so that the water curtain can accurately fall on the optical fiber in the groove 31, which is conducive to reducing the thickness of the water curtain to reduce the amount of circulating water, and can also prevent the water curtain from shaking and breaking due to the influence of external airflow.

[0049] Further, in a feasible embodiment, referring to Figure 1 and Figure 3 A plurality of hollow portions 51 are arranged in an array on the water curtain plate 5, and a plurality of teeth 52 arranged along the length direction are fixedly connected to the bottom of the water curtain plate 5. The setting of the hollow portions 51 helps to reduce the thickness of the water curtain while maintaining the continuity of the water curtain. The setting of the teeth 52 can break the surface tension of the water curtain flowing down from the bottom of the water curtain plate 5, so as to ensure the integrity of the water curtain strip formed under the water curtain plate 5.

[0050] In another feasible embodiment, the water curtain plate 5 is encapsulated with a refrigerant, and the water curtain plate 5 can be detachably installed under the downpipe 4. Its detachable installation method is not limited to any method that can maintain the stability of the water curtain plate 5, such as snap-on, plug-in, and bolt-on. In this embodiment, T-blocks 71 are fixedly connected to the upper parts of both ends of the water curtain plate 5, and T-slots 72 are provided at both ends of the downpipe 4. The T-blocks 71 are plugged and adapted to the T-slots 72. In the specific setting, a plurality of convex parts are arranged at intervals along the length direction of the water curtain plate 5, and the top and bottom ends of the convex parts are both provided with streamlined transition surfaces to reduce water flow resistance. The convex parts are arranged vertically and the distances of their protrusions on the two side surfaces of the water curtain plate 5 are the same. A cavity is preset inside the convex part, and the cavity is filled with refrigerant.

[0051] In this way, in actual operation, multiple water curtain plates 5 of the same specifications can be pre-placed in a refrigerator or freezing equipment for freezing. After the freezing liquid reaches the freezing requirements, the water curtain plates 5 can be mounted under the downpipe 4. The water curtain can be cooled by the frozen freezing liquid in the water curtain plates 5. There is no need to set up refrigeration equipment in the water supply assembly, and only the frozen water curtain plates 5 need to be manually replaced.

[0052] In other feasible embodiments, the above-mentioned hollow portion 51 and the method of setting the refrigerant in the cavity can also be combined. For example, a convex portion is set on the upper part of the water curtain plate 5 and filled with refrigerant, and a hollow portion 51 and a tooth portion 52 are set on the lower part, which can have the above-mentioned multiple beneficial effects.

[0053] In addition, considering that in actual production, the temperature of the optical fiber just output from the extruder 1 is relatively high, if it is suddenly cooled, the outer layer of the sheath will quickly solidify and set, but the inner layer will not reach the setting temperature, which may easily cause quality problems.

[0054] Therefore, refer to Figure 1 and Figure 2 A transition slope 32 is provided on the upper end surface of the support platform 3 close to the extruder 1, and the end of the transition slope 32 close to the middle of the support platform 3 is the higher end, and at least half of the transition slope 32 is submerged below the liquid level of the cooling water tank 2.

[0055] The significance of such a setting is that when the cooling water in the cooling water tank 2 is in a stationary state, there will be a stratification phenomenon in which warm water moves upward and cold water sinks. Even if the water curtain on the downpipe 4 continues to input cooling water into the cooling water tank 2, the water temperature of the upper layer of the cooling water is still the highest, followed by the cooling water that flows down through the transition slope 32 after contacting the optical fiber for flow-type heat exchange and the water temperature of the lower layer of the cooling water, and then the water temperature of the water flow in the water curtain. Through the above setting, the optical fiber can first be immersed in the upper layer of warm water in the cooling water tank 2, and then smoothly move up to the groove 31 on the support 3 with the help of the transition slope 32, and be cooled and cooled by the water stored in the groove 31 and the water curtain, so that a gradient cooling and cooling of the optical fiber can be formed to ensure the extrusion molding quality of the optical fiber sheath as much as possible.

[0056] Moreover, refer to Figure 3 and Figure 4 , in order to prevent the pedestal 3 from overheating in the upper layer of cooling water.

[0057] On the one hand, a plurality of heat conducting members 33 extending to the bottom of the cooling water tank 2 are fixedly connected to the bottom of the pedestal 3. The heat conducting members 33 are used to conduct the heat on the pedestal 3 to the cooling water at the bottom of the cooling water tank 2. The heat conducting members 33 may be fins. With the arrangement of the heat conducting members 33, part of the heat on the pedestal 3 may be conducted to the low-temperature cooling water at the bottom of the cooling water tank 2, so as to reduce the temperature of the pedestal 3 itself as much as possible.

[0058] On the other hand, the support 3 is provided with a plurality of drainage holes 34 spaced apart along the length direction thereof on the groove wall of the groove 31. The drainage holes 34 are arranged in the thickness direction of the support 3. The drainage holes 34 are arranged in two rows along the length direction of the support 3. The drainage holes 34 in the two rows are arranged in an "eight" shape and penetrate the oblique groove wall of the groove 31, and the drainage holes 34 are all rounded at one end close to the groove 31. With the arrangement of the drainage holes 34, the cooling water in the water curtain can flow through the plurality of drainage holes 34 into the cooling water tank 2, which can have a certain temperature control effect on the support 3; at the same time, the arrangement of the drainage holes 34 can also reduce the impact of the water flow of the water curtain in the groove 31, and reasonably control the water storage amount in the groove 31, which can significantly reduce the phenomenon of disordered swinging of the optical fiber in the groove 31 due to the impact of the water curtain, and ensure the precise cooling and cooling effect of the water curtain on the optical fiber as much as possible.

[0059] At the same time, refer to Figure 1 Both ends of the support platform 3 are provided with limit blocks 35 for limiting the optical fiber from falling out of the groove 31. The limit blocks 35 can be bolted and fixed on the end of the support platform 3, or can be plugged, clamped or magnetically attracted to the support platform 3. The specific implementation method is not limited.

[0060] The present application embodiment discloses an optical fiber sheath extrusion process, based on the above-mentioned optical fiber sheath extrusion system, referring to Figure 1 , which comprises the following steps:

[0061] S1. The sheath raw material is put into the extruder 1 for hot melting, and the optical fiber is passed through the extruder head 1, the optical fiber wrapped in the sheath passes through two guide wheels 21, and the middle part thereof is overlapped on the support 3;

[0062] S2. Water is supplied to the downpipe 4 through the water supply assembly, so that the cooling water in the downpipe 4 flows down from the multiple downpipe holes 41 and forms a water curtain to continuously flush the optical fiber on the base 3, and the flowing cooling water is used to efficiently cool the optical fiber.

[0063] The implementation principle of an optical fiber sheath extrusion system in the embodiment of the present application is:

[0064] After the optical fiber passes through the extruder head of the extruder 1, the extruder 1 extrude the molten plastic raw material and wrap it around the outer periphery of the optical fiber to form a sheath, and then the optical fiber wrapped with the sheath is overlapped on two guide wheels 21 and passes through the cooling water tank 2. During this period, the optical fiber passes on the support platform 3 in the cooling water tank 2, and the water supply component continuously transports low-temperature cooling water to the downpipe 4, so that the multiple downholes 41 on the downpipe 4 continuously flow out water and converge into a water curtain above the support platform 3. The water curtain can perform flowing water cooling and cooling on the optical fiber on the support platform 3. On the first hand, it can ensure the consistency of temperature control of the optical fiber output from the extruder 1 when it is shaped by cooling water, and can effectively avoid the deviation of shaping temperature control caused by inconsistent water temperature before and after the optical fiber passes directly in the cooling water in conventional technology, and can ensure the extrusion molding quality of the optical fiber sheaths of the same batch.

[0065] Secondly, since the water curtain cools the optical fiber in a flowing manner, this cooling method is highly efficient and can enable the optical fiber to reach the set molding temperature more quickly. Therefore, the cooling water tank 2 does not need to be set longer, which can greatly save the floor space of the extrusion system in the factory. Secondly, a large amount of cooling water does not need to be circulated in the corresponding cooling water tank 2, which can not only reduce water consumption, but also reduce the refrigeration load when necessary, and the economy is more significant.

[0066] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical fiber sheath extrusion system, comprising an extruder (1) and a cooling water tank (2) arranged on one side of an extrusion head of the extruder (1), characterized in that: Guide wheels (21) for guiding optical fibers are provided at both ends of the cooling water trough (2); a support platform (3) is provided in the cooling water trough (2) along its length direction; the optical fibers passing through the two guide wheels (21) at both ends are overlapped on the support platform (3); the support platform (3) is made of a high thermal conductivity material; the upper part of the support platform (3) protrudes above the liquid level in the cooling water trough (2) and the lower part is sunken below the liquid level in the cooling water trough (2); A water down pipe (4) is arranged above the cooling water trough (2) and is arranged along the length direction of the support platform (3); a water supply component for conveying low-temperature water to the water down pipe (4) is arranged between the water down pipe (4) and the cooling water trough (2); A plurality of water drop holes (41) are provided at the lower part of the water drop pipe (4), and water flowing out of the plurality of water drop holes (41) converges above the support platform (3) to form a water curtain; The upper end surface of the support platform (3) has a smooth groove (31) arranged along its length direction, and the thickness of the water curtain below the downpipe (4) is smaller than the groove width of the groove (31); A vertically arranged water curtain plate (5) is installed below the downpipe (4), and a gap is provided between the water curtain plate (5) and the upper end surface of the support platform (3); The water curtain plate (5) is provided with a plurality of hollow portions (51) in an array on the upper side, and the bottom side of the water curtain plate (5) is fixedly connected with a plurality of tooth portions (52) arranged along the length direction thereof; The water curtain plate (5) contains a refrigerant liquid, and the water curtain plate (5) is detachably mounted below the downpipe (4).

2. The optical fiber sheath extrusion system according to claim 1, characterized in that: A transition slope (32) is provided on the upper end surface of the support platform (3) close to one end of the extruder (1); the end of the transition slope (32) close to the middle of the support platform (3) is the higher end; at least half of the transition slope (32) is submerged below the liquid level of the cooling water tank (2).

3. The optical fiber sheath extrusion system according to claim 2, characterized in that: A plurality of heat-conducting members (33) extending to the bottom of the cooling water trough (2) are fixedly connected to the bottom of the support platform (3), and the heat-conducting members (33) are used to conduct heat on the support platform (3) to cooling water at the bottom of the cooling water trough (2).

4. The optical fiber sheath extrusion system according to claim 1, characterized in that: The support platform (3) is provided with a plurality of drainage holes (34) spaced apart along the length direction of the groove (31) on the groove wall, and the drainage holes (34) are arranged through the thickness direction of the support platform (3).

5. The optical fiber sheath extrusion system according to claim 4, characterized in that: Both ends of the support platform (3) are provided with limit blocks (35) for limiting the optical fiber from falling out of the groove (31).

6. An optical fiber sheath extrusion process, based on an optical fiber sheath extrusion system as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Putting the sheath raw material into the extruder (1) for heat melting, passing the optical fiber through the extrusion head of the extruder (1), passing the optical fiber wrapped in the sheath through the two guide wheels (21), and making the middle part thereof overlap on the support platform (3); S2. Water is supplied to the downpipe (4) through the water supply assembly, so that the cooling water in the downpipe (4) flows down from the plurality of downpipe holes (41) and forms a water curtain to continuously flush the optical fiber on the support platform (3), thereby efficiently cooling the optical fiber with the flowing cooling water.

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