System and method for preparing silicon carbide preform with length-diameter ratio for cladding

Abstract

The invention provides a preparation system and method of a length-diameter-ratio silicon carbide preform for cladding, the system comprises a feeding system, a weaving system, a flexible traction system, an online shape maintaining system and a discharging system which are arranged in sequence, and a core mold is fed through the feeding system and penetrates through the weaving system and the flexible traction system to the discharging system; the weaving system is used for weaving silicon carbide fibers on the core mold; the flexible traction system is used for providing self-adaptive pressing force for the woven core mold; the online shape maintaining system is used for normalizing the external shape of the prefabricated body; the supporting levelness of the flexible traction system, the on-line shape maintaining system and the discharging system for the core mold is consistent. According to the manufacturing system, the feeding system, the weaving system, the flexible traction system, the online shape maintaining system and the discharging system are adopted for supporting the core mold, the core mold can be prevented from generating deflection due to the gravity of the core mold, and then the straightness of the formed prefabricated body is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of textile technology, and in particular to a system and method for preparing a silicon carbide preform with an aspect ratio for a cladding. Background Art

[0002] At present, in order to deal with the risks of core meltdown and hydrogen explosion, and thus to minimize the probability and risk of core meltdown and large-scale radioactive release, a reactor cladding system based on silicon carbide composite ceramic (SiCf / SiC) has been proposed. The advantages of SiCf / SiC composite cladding over zirconium alloy cladding are:

[0003] (1) More stable in high temperature environment, the thermal expansion coefficient is only 4.4×10-5K-1 at high temperature;

[0004] (2) It produces less heat and hydrogen when reacting with high-temperature steam. Under the same accident conditions, the reaction rate with water vapor is only 0.1% of that of zirconium alloy, and the amount of hydrogen produced is only 0.25% of that of zirconium alloy;

[0005] (3) Lower neutron toxicity.

[0006] Since the SiCf / SiC composite cladding has the characteristics of long size, thin thickness, fine diameter and high straightness, and the SiC fiber preform is the key core skeleton in the SiCf / SiC composite cladding, its structure, porosity and other parameters directly affect the performance of the cladding material.

[0007] At present, the degree of manual intervention in the preform forming method of silicon carbide cladding tubes is high, and the uniformity of the braided structure, ultra-high aspect ratio, tension stability control, and product quality consistency are difficult to ensure, which has a great impact on the performance of the SiCf / SiC composite cladding.

[0008] Based on this, the inventors of the present application propose a system and method for preparing a silicon carbide preform with a high aspect ratio for cladding, in order to solve the above technical problems. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the defect of poor quality of silicon carbide preform products in the prior art and to provide a system and method for preparing a silicon carbide preform with a high aspect ratio for cladding.

[0010] The present invention solves the above technical problems through the following technical solutions:

[0011] The present invention provides a system for preparing a silicon carbide preform with a high aspect ratio for a cladding, which is characterized in that it comprises: a feeding system, a weaving system, a flexible traction system, an online shaping system and a discharging system which are arranged in sequence, the core mold is fed through the feeding system, and is passed through the weaving system, the flexible traction system to the discharging system;

[0012] The weaving system is used to weave the silicon carbide fiber onto the core mold; the flexible traction system is used to provide an adaptive pressing force to the woven core mold; the online shaping system is used to regularize the external shape of the preform; wherein,

[0013] The flexible traction system, the online shaping system and the discharging system have consistent support levels for the core mold.

[0014] According to one embodiment of the present invention, the braidable length of the core mold is between 0.5m and 6m.

[0015] According to one embodiment of the present invention, the distance from the front end of the flexible traction system to the front end of the discharging system is between 0.5m and 6m.

[0016] According to one embodiment of the present invention, the diameter of the core mold is between 3 mm and 20 mm, and the weaving angle is 20°-70°.

[0017] According to one embodiment of the present invention, the single-layer wall thickness of the preform is between 0.2 mm and 0.6 mm, and the volume fraction of silicon carbide in the preform is between 20% and 50%;

[0018] The outer diameter of the preform is 3.4 mm-25 mm, and the aspect ratio is 80-1200.

[0019] According to one embodiment of the present invention, the braiding system includes a yarn carrier and a ceramic eye, and the silicon carbide fiber is wound on a disk head on the yarn carrier and is pulled by the ceramic eye.

[0020] According to one embodiment of the present invention, the ceramic eye comprises an upper roller and a lower roller, and the silicon carbide fiber is inserted into the gap between the upper roller and the lower roller; wherein,

[0021] The upper roller and the lower roller are in a rotating state.

[0022] According to one embodiment of the present invention, the braiding system is further provided with a tension adjustment mechanism for adjusting the yarn tension of the silicon carbide fiber.

[0023] According to one embodiment of the present invention, the flexible traction system comprises a driving unit and a pressure control unit, and the driving unit drives the core mold to move along its axial direction according to the weaving speed of the weaving system;

[0024] The pressure control unit self-adjusts the pressure value applied to the core mold.

[0025] According to one embodiment of the present invention, the online profiling system includes roller mechanisms that cooperate with each other, and the roller mechanisms are used to regularize the shape of the braided fabric passing through the outer side of the core mold of the flexible traction system.

[0026] According to one embodiment of the present invention, the online dimensional profiling system is further provided with an image acquisition mechanism and an analysis mechanism, wherein the image acquisition mechanism is used to capture the core mold that has been woven through the online dimensional profiling system;

[0027] The analysis mechanism is used to analyze the images collected by the image collection mechanism to determine whether the preform completed by weaving meets the quality requirements.

[0028] According to one embodiment of the present invention, a level meter is provided on the discharging system for detecting the levelness of the core mold after weaving.

[0029] The present invention also provides a method for preparing a silicon carbide preform with a high aspect ratio for a cladding, which is characterized in that it is implemented by using the system for preparing a silicon carbide preform with a high aspect ratio for a cladding as described above, and the preparation method comprises:

[0030] Step 1: Determine the preform molding process parameters according to the target product requirements;

[0031] Step 2, the regular movement of the yarn carrier drives the silicon carbide fiber to be woven through the weaving system;

[0032] Step 3: using the image acquisition mechanism and analysis mechanism of the online dimensional system to determine whether the woven preform meets the quality requirements;

[0033] Step 4: reciprocatingly weave according to product requirements to form a multi-layer preform.

[0034] According to one embodiment of the present invention, the length of the preform is between 0.5m and 6m;

[0035] The single-layer wall thickness of the preform is between 0.2 mm and 0.6 mm, and the volume fraction of silicon carbide in the preform is between 20% and 50%;

[0036] The outer diameter of the preform is 3.4 mm-25 mm, and the aspect ratio is 80-1200.

[0037] The positive and progressive effects of the present invention are:

[0038] The system for preparing a silicon carbide preform with a high aspect ratio for the cladding of the present invention adopts a feeding system, a weaving system, a flexible traction system, an online shaping system and a discharging system to support the core mold, which can prevent the core mold from being deflected due to its own gravity, thereby effectively improving the straightness of the molded preform.

[0039] The flexible traction system and online shaping system can prevent fiber damage and preform cross-section deformation, effectively ensuring the surface accuracy of the preform. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0041] Figure 1 It is a structural schematic diagram of a system for preparing a silicon carbide preform with a high aspect ratio for cladding of the present invention;

[0042] Figure 2 for Figure 1 Schematic diagram of the structure of the middle porcelain eye;

[0043] Figure 3 It is a schematic diagram of the structure of the preform woven in the present invention;

[0044] Figure 4 The present invention is a flow chart of a method for preparing a silicon carbide preform with a high aspect ratio for cladding.

[0045] 1. Feeding system; 11. Core mold;

[0046] 2. Weaving system; 21. Yarn carrier; 22. Ceramic eye; 23. Upper roller; 24. Lower roller; 25. Tension adjustment mechanism;

[0047] 3. Flexible traction system; 31. Driving unit; 32. Pressure control unit;

[0048] 4. Online dimensional system; 41. Image acquisition mechanism; 42. Analysis mechanism; 43. Roller mechanism;

[0049] 5. Discharging system; 51. Level meter. DETAILED DESCRIPTION

[0050] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0052] Please refer to Figures 1 to 3 The present invention provides a system for preparing a cladding aspect ratio silicon carbide preform, comprising a feeding system 1, a weaving system 2, a flexible traction system 3, an online shaping system 4 and a discharging system 5 arranged in sequence, and a core mold 11 is fed through the feeding system 1 and passed through the weaving system 2, the flexible traction system 3 to the discharging system 5. The weaving system 2 is used to weave silicon carbide fibers on the core mold 11; the flexible traction system 3 is used to provide an adaptive pressing force to the woven core mold 11; the online shaping system 4 is used to regularize the external shape of the preform; wherein, the flexible traction system 3, the online shaping system 4 and the discharging system 5 have the same support level for the core mold 11.

[0053] In one embodiment, the length of the core mold 11 is between 0.5 m and 6 m. The braidable length of the core mold 11 corresponds to the braidable length of the preform.

[0054] That is, the present application can realize the weaving of a core mold 11 with a length of 0.5 m, and can also realize the weaving of a core mold 11 with a length of up to 6 m, while ensuring that the straightness of the woven preform meets the requirements.

[0055] Furthermore, the feeding system 1 , the weaving system 2 , the flexible traction system 3 , the online shaping system 4 and the discharging system 5 can all support the core mold 11 .

[0056] The front end of the flexible traction system 3 is the starting end of weaving, and the front end of the discharging system 1 is the rear end of supporting the preform.

[0057] Before weaving, the feeding system 1 and the weaving system 2 support the core mold 11 to ensure the horizontality of the core mold 11.

[0058] As the weaving progresses, the portion of the preform that has been woven is supported by the flexible traction system 3 and the in-line shaping system 4 .

[0059] It can be seen that the distance from the front end of the flexible traction system 3 to the front end of the discharging system 5 is 0.5m to 6m, see Figure 1 The length of L is 0.5m to 6m.

[0060] Preferably, the length of the core mold 11 is between 2m and 6m, and thus the distance from the front end of the flexible traction system 3 to the front end of the discharging system 5 is also between 2m and 6m.

[0061] In one embodiment, the diameter of the core mold 11 is between 3 mm and 20 mm, the knitting angle is 20°-70°, the number of knitting spindles is 4-54, and the knitting speed is infinitely adjustable within the range of 10-500 mm / min.

[0062] Furthermore, the single-layer wall thickness of the preform is between 0.2 mm and 0.6 mm, and the volume fraction of silicon carbide in the preform is between 20% and 50%; the outer diameter of the preform is between 3.4 mm and 25 mm, and the aspect ratio is 80-1200.

[0063] In one embodiment, the feeding system 1 is a support structure, such as a plurality of roller support structures, for supporting one end of the core mold 11. Using rollers for support can reduce the friction between the core mold 11 and the feeding system 1, preventing the surface of the core mold 11 from being damaged during movement.

[0064] The braiding system 2 is arranged downstream of the feeding system 1 , and comprises a yarn carrier 21 and a ceramic eye 22 . The silicon carbide fiber is wound on a disk head on the yarn carrier 21 and is pulled by the ceramic eye 22 .

[0065] Specifically, the ceramic eye 22 includes an upper roller 23 and a lower roller 24, and the silicon carbide fiber is inserted into the gap between the upper roller 23 and the lower roller 24; wherein the upper roller 23 and the lower roller 24 are in a rotating state.

[0066] Since silicon carbide fibers have a flat structure, if conventional round ceramic eyes 22 are used, the sliding friction between the ceramic eyes 22 and the silicon carbide fibers will undoubtedly cause severe wear on the silicon carbide fibers, thereby affecting the dimensional accuracy and quality of the preform.

[0067] The present invention adopts rolling ceramic eye 22, which changes the traditional sliding friction into rolling friction, and can effectively reduce the wear of silicon carbide fiber during the weaving process, thereby improving the dimensional accuracy and straightness of the cladding material at the preform level.

[0068] That is, the flat silicon carbide fibers pass through the ceramic eye 22, and the ceramic eye 22 keeps the fibers regular without generating excessive friction with the fibers.

[0069] Preferably, the material of the upper roller 23 and the lower roller 24 is at least one of high-performance composite ceramics such as tungsten steel, alumina ceramics, zirconium oxide ceramic-based titanium oxide ceramics, etc.

[0070] Furthermore, the braiding system 2 is also provided with a tension adjustment mechanism 25 for adjusting the yarn tension of the silicon carbide fiber.

[0071] The tension adjustment mechanism 25 may be a tensioning wheel or other tension adjustment mechanisms. The tension adjustment mechanism 25 is used to adjust the tension value that the silicon carbide fiber bears during the weaving process.

[0072] In the actual weaving process, the preform forming process parameters are first determined according to the target product requirements; wherein the process parameters include the weaving angle, the number of weaving spindles and the weaving speed.

[0073] The weaving angle, number of spindles and speed can be adjusted by the weaving system 2 to meet product requirements.

[0074] In the initial state, the aspect ratio core mold 11 is first placed on the feeding system 1, passed through the braiding system 2 and clamped by the flexible traction system 3, and then the silicon carbide fiber is fixed on the disk head, the number of revolutions is set and the rotation speed is adjusted, and then the fiber is wound onto the disk head.

[0075] The flexible traction system 3 includes a driving unit 31 and a pressure control unit 32 and is arranged downstream of the weaving system 2. The driving unit 31 drives the core mold 11 to move along its axial direction at the weaving speed of the weaving system 2; the pressure control unit 32 automatically adjusts the pressure value applied to the core mold 11.

[0076] The driving part 31 may be a roller driving mechanism, which utilizes the rotation of the roller to drive the core mold 11 to move along its axial direction. The moving speed of the core mold 11 needs to be consistent with the weaving speed of the silicon carbide fiber.

[0077] The pressure control unit 32 can adjust the pressure value applied to the core mold 11 and the external braid to ensure that the braid and the core mold 11 do not change their shapes too much, and clamp the core mold 11 to prevent the core mold 11 from rotating and affecting the braiding accuracy.

[0078] In one embodiment, the tension adjustment range of the tension adjustment mechanism 25 is 2-10N; the adaptive pressure adjustment range of the pressure control unit 32 is 100-1000N.

[0079] The in-line shaping system 4 includes roller mechanisms 43 that cooperate with each other. The roller mechanisms 43 are used to regularize the shape of the braided fabric passing through the outside of the core mold 11 of the flexible traction system 3.

[0080] The roller mechanism 43 is provided with a groove (not shown) on the side facing the core mold 11, and the size of the groove corresponds to the size of the core mold 11. When the preform after weaving passes through the flexible traction system 3, the pressure of the flexible traction system 3 will cause the shape of the braid outside the core mold 11 to change, so the roller mechanism 43 is required to restore the flattened shape of the braid, thereby improving the cross-sectional roundness of the preform after weaving.

[0081] Furthermore, an image acquisition mechanism 41 and an analysis mechanism 42 are also provided on the online dimensional system 4. The image acquisition mechanism 41 is used to capture the woven core mold 11 passing through the online dimensional system 4; the analysis mechanism 42 is used to analyze the image captured by the image acquisition mechanism 41, and then determine whether the woven preform meets the quality requirements.

[0082] Specifically, during the weaving process, the image acquisition mechanism 41 and the analysis mechanism 42 on the linear dimensional system 4 detect the quality of the preform after weaving in real time, thus ensuring that the final preform meets the requirements.

[0083] The discharging system 5 is arranged downstream of the inline molding system 4 and is used to effectively support the preform.

[0084] It can be seen that in the traditional preform preparation process, the length of the core mold 11 is generally not more than 2m, otherwise the bending of the core mold 11 due to gravity will seriously affect the straightness and surface accuracy of the finished product. Specifically, in the traditional preform preparation process, the length of the preform is mostly between 1.5m and 2m. If it is too short, it is not convenient to weave, and if it is too long, the straightness and surface accuracy of the preform cannot be guaranteed.

[0085] In the present invention, the length of the core mold 11 is split so that the distance between the flexible traction system 3, the online shaping system 4 and the discharge system 5 is greater than 2m, thereby ensuring the weaving side of the core mold 11, and also ensuring the surface accuracy and straightness of the preform corresponding to the flexible traction system 3, the online shaping system 4 and the discharge system 5.

[0086] In this way, the present invention can meet the weaving requirements of the preform with high straightness of 0.5m-6m.

[0087] Specifically, a level meter 51 is provided on the discharging system 5 for detecting the levelness of the woven core mold 11 .

[0088] In this way, the level meter 51 cooperates with the image acquisition mechanism 41 and the analysis mechanism 42 of the online profiling system 4 to ensure the weaving quality and straightness during the preform weaving process.

[0089] In summary, the system for preparing a silicon carbide preform with a length-to-diameter ratio for the cladding of the present invention adopts a feeding system 1, a weaving system 2, a flexible traction system 3, an online shaping system 4 and a discharging system 5 to support the core mold 11, which can prevent the core mold 11 from being deflected due to its own gravity, thereby effectively improving the straightness of the molded preform.

[0090] The flexible traction system 3 and the online shaping system 4 can prevent fiber damage and preform cross-section deformation, and effectively ensure the profile accuracy of the preform.

[0091] That is, the present invention can improve the straightness and cross-sectional roundness of the aspect ratio silicon carbide preform, reduce fiber damage, and improve the air tightness of the composite material cladding.

[0092] Reference Figure 4 The present invention also provides a method for preparing a silicon carbide preform with a high aspect ratio for a cladding, which is implemented by using the above-mentioned system for preparing a silicon carbide preform with a high aspect ratio for a cladding. The preparation method comprises:

[0093] S1. Determine the preform molding process parameters according to the target product requirements; wherein the process parameters include weaving angle, number of weaving spindles and weaving speed.

[0094] S2. The regular movement of the yarn carrier drives the silicon carbide fiber to be woven through the weaving system.

[0095] S3, using the image acquisition mechanism and analysis mechanism of the online dimensional system to determine whether the woven preform meets the requirements;

[0096] S4. Perform reciprocating weaving according to product requirements to form a multi-layer preform.

[0097] The outer diameter of the preform of the present invention is 3.4 mm-25 mm, and the aspect ratio is 80-1200; moreover, the present invention meets the need for weaving a core mold 11 between 0.5 m and 6 m, and at the same time meets the requirement of high straightness.

[0098] In one embodiment, a silicon carbide preform for a cladding having a diameter of 6 mm and a length of 2 m is used as an example for explanation:

[0099] Step 1: Design the preform molding process parameters according to product requirements, for example, the weaving angle is 37°, the number of weaving spindles is 24, and the weaving speed is 40 mm / min.

[0100] Step 2: Place the aspect ratio core mold in the feeding system and clamp it using a flexible traction system, and then introduce and fix it from one end of the braiding system.

[0101] Fix the silicon carbide fiber on the disc head, set the number of revolutions and adjust the speed, and wind it onto the disc head.

[0102] After the disc head is placed in the yarn carrier, the silicon carbide fiber is pulled through the porcelain eye to the core mold for fixation.

[0103] The diameter of the core mold is selected to be 6 mm, and the material of the core mold is at least one of zirconium alloy, tungsten alloy, graphite, stainless steel, quartz glass, etc.

[0104] Step 3, set the tension value of the tension adjustment mechanism to 5N, and the adaptive pressure of the flexible traction system to 150N. The regular movement of the yarn carrier drives the movement of the carbon fiber, so that the carbon fibers are closely interwoven with each other to form a regular structure, and then pulled by the flexible traction system. After reaching the length that meets the size requirements, reciprocating weaving is performed to form a multi-layer preform.

[0105] Repeat the above weaving steps to form a preform.

[0106] The single-layer wall thickness of the preform is 0.25 mm, the volume fraction of silicon carbide fiber in the preform is 37%, the outer diameter of the preform is 7 mm, the length is 2000 mm, and the aspect ratio is 285.7.

[0107] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0108] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0109] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A system for preparing a silicon carbide preform with a high aspect ratio for cladding, characterized in that: include: A feeding system, a weaving system, a flexible traction system, an online molding system and a discharging system are arranged in sequence, the core mold is fed through the feeding system, and is passed through the weaving system, the flexible traction system to the discharging system; The weaving system is used to weave the silicon carbide fiber onto the core mold; the flexible traction system is used to provide an adaptive pressing force to the woven core mold; the online shaping system is used to regularize the external shape of the preform; wherein, The flexible traction system, the online shaping system and the discharging system have consistent support levels for the core mold.

2. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 1, characterized in that: The braidable length of the core mold is between 0.5m and 6m.

3. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 1, characterized in that: The distance from the front end of the flexible traction system to the front end of the discharging system is between 0.5m and 6m.

4. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 1, characterized in that: The diameter of the core mold is between 3mm and 20mm, and the knitting angle is 20° to 70°.

5. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 1, characterized in that: The single-layer wall thickness of the preform is between 0.2 mm and 0.6 mm, and the volume fraction of silicon carbide in the preform is between 20% and 50%; The outer diameter of the preform is 3.4 mm-25 mm, and the aspect ratio is 80-1200.

6. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 1, characterized in that: The braiding system comprises a yarn carrier and a porcelain eye, wherein the silicon carbide fiber is wound on a disk head on the yarn carrier and is pulled by the porcelain eye.

7. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 6, characterized in that: The ceramic eye comprises an upper roller and a lower roller, and the silicon carbide fiber is inserted into the gap between the upper roller and the lower roller; wherein, The upper roller and the lower roller are in a rotating state.

8. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 6, characterized in that: The braiding system is also provided with a tension adjustment mechanism for adjusting the yarn tension of the silicon carbide fiber.

9. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 8, characterized in that: The flexible traction system comprises a driving part and a pressure control part, wherein the driving part drives the core mold to move along its axial direction according to the weaving speed of the weaving system; The pressure control unit self-adjusts the pressure value applied to the core mold.

10. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 1, characterized in that: The online profiling system includes roller mechanisms that cooperate with each other, and the roller mechanisms are used to regularize the shape of the braided fabric passing through the outer side of the core mold of the flexible traction system.

11. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 10, characterized in that: The online dimensional profiling system is also provided with an image acquisition mechanism and an analysis mechanism, wherein the image acquisition mechanism is used to acquire the image of the core mold that has been woven through the online dimensional profiling system; The analysis mechanism is used to analyze the images collected by the image collection mechanism to determine whether the preform completed by weaving meets the quality requirements.

12. The system for preparing a silicon carbide preform with a high aspect ratio for cladding according to claim 1, characterized in that: The discharging system is provided with a level meter for detecting the levelness of the core mold after weaving.

13. A method for preparing a silicon carbide preform with a high aspect ratio for cladding, characterized in that: The method is implemented by using the system for preparing a silicon carbide preform with a high aspect ratio for cladding according to any one of claims 1 to 12, wherein the preparation method comprises: Step 1: Determine the preform molding process parameters according to the target product requirements; Step 2, the regular movement of the yarn carrier drives the silicon carbide fiber to be woven through the weaving system; Step 3: using the image acquisition mechanism and analysis mechanism of the online dimensional system to determine whether the woven preform meets the quality requirements; Step 4: reciprocatingly weave according to product requirements to form a multi-layer preform.

14. The method for preparing a silicon carbide preform with an aspect ratio for cladding according to claim 13, characterized in that: The length of the preform is between 0.5m and 6m; The single-layer wall thickness of the preform is between 0.2 mm and 0.6 mm, and the volume fraction of silicon carbide in the preform is between 20% and 50%; The outer diameter of the preform is 3.4 mm-25 mm, and the aspect ratio is 80-1200.

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