Carbon-carbon supporting rod wound by fibers

Abstract

The utility model discloses a fiber-wound carbon-carbon supporting rod which comprises a supporting rod head and a supporting rod body which are fixedly connected and are both of a hollow structure. The supporting rod head embedded part is in a hollow dumbbell shape, the fiber winding layer is arranged on the outer side of the supporting rod head embedded part, the inner side of the fiber winding layer is tightly attached to the supporting rod head embedded part and is combined with the supporting rod head into a whole, and the outer side of the fiber winding layer is of a cone structure. The supporting rod body and the fiber winding layer are both of a fiber winding structure. When the supporting rod is used, the problems that a fiber winding layer of a traditional supporting rod is thick in winding, fibers are prone to twisting and wrinkling, or long fibers are broken due to too large machining amount, and the mechanical property of a product is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon-carbon support rods, and specifically relates to a fiber-wound carbon-carbon support rod. Background Technique

[0002] Carbon-carbon support rods are usually applied to high-temperature and high-pressure environments, generally used to support heavy objects. For example, they are placed in the furnace cavity of a single crystal furnace to carry a crucible, and the other end is connected to a driving device to rotate in the furnace cavity. While the crucible support rod is resistant to high temperature and high pressure, it also needs to have good load-bearing strength. Since the support rod head needs to be connected to the driving device, the thickness of the support rod head is much larger than that of the support rod body. If formed integrally, fiber accumulation and distortion are likely to occur at the thick part of the support rod head, which has a significant impact on the load-bearing and distortion of the support rod.

[0003] Many patents at home and abroad have carried out fiber winding to prepare rotating bodies or support rods. For example, patent CN201810066865.6 discloses a method for preparing a carbon / carbon cylinder by a winding process. The preparation process is as follows: According to the size specifications of the cylinder, use graphite materials to design and manufacture a forming mold; according to the usage function requirements of the cylinder, design the product structures of the sealing type cylinder and the structural type cylinder respectively; use a winding machine for winding and forming; then carry out curing-carbonization-chemical vapor deposition (chemical vapor infiltration) densification-high temperature-machining treatment to form. When manufacturing products with relatively large winding thickness such as support rod heads by this method, fiber distortion and wrinkles will occur, affecting the product performance. Patent CN202310164032.4 discloses a carbon-carbon composite support rod and its preparation method. The preparation process is as follows: Acupuncture a carbon fiber flat preform with sufficient thickness, and after densifying and high-temperature forming the preform, carry out machining to form a support rod. This method uses the acupuncture method to integrally form a large-thickness plate blank, and then machined into shape. Due to serious performance loss of the short-cut acupuncture fibers, the forming efficiency of the support rod is low, the machining amount is large, and the material waste is serious. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a combined fiber-wound carbon-carbon support rod to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A fiber-wound carbon-carbon support rod, comprising: a support rod head and a support rod body, the support rod head and the support rod body are fixedly connected, and both are of hollow structures;

[0007] The support rod head is of a conical structure, including a support rod head embedded part and a fiber winding layer. The support rod head embedded part is in the shape of a hollow dumbbell, and the fiber winding layer is arranged on the outside of the support rod head embedded part; the inner side of the fiber winding layer is closely attached to the support rod head embedded part, combined with the support rod head into one body, and the outer side is of a conical structure;

[0008] Both the supporting rod body and the fiber winding layer are of fiber winding structure.

[0009] In some embodiments, the embedded part of the supporting rod head includes a flared section, a neck section, and an extension section arranged in sequence, and the flared part, the neck part, and the extension part are integrally arranged.

[0010] In some embodiments, the flared section of the embedded part of the supporting rod head is arranged close to the supporting rod body, and the extension section is arranged far from the supporting rod body.

[0011] In some embodiments, the fiber winding layer of the supporting rod head and the supporting rod body are integrally arranged.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. For the structure of the carbon-carbon supporting rod of the present utility model, by wrapping the dumbbell-shaped embedded part of the supporting rod head with the fiber winding layer, the contact area between the fiber winding layer and the embedded part of the supporting rod head is increased, and the force is evenly dispersed on the embedded part of the supporting rod head, preventing the force from being too concentrated, and improving the stress performance and load-bearing capacity of the supporting rod.

[0014] 2. The fiber winding layer forms a groove structure through the extension section and the flared section, so that the fiber winding layer is fixed in the groove, solving the problem of the supporting rod head falling off and sliding caused by the non-integral molding of the supporting rod head, and further improving the stress performance of the supporting rod head.

[0015] 3. By correspondingly setting the shapes and sizes of the flared section and the reduced-diameter section of the present utility model, the flared section of the embedded part of the supporting rod head is sleeved on the reduced-diameter section of the mold core of the supporting rod body, which is convenient for the installation of the embedded part of the supporting rod head. The flared section and the reduced-diameter section can be directly sleeved together, and at the same time, the sleeved embedded part of the supporting rod head and the mold core are not easy to slide, which is convenient for subsequent overall winding of long fibers.

[0016] 4. By performing layer-by-layer overall winding on the supporting rod winding mold with long fibers, the long fibers between the supporting rod body and the supporting rod head are pulled and stressed, further improving the stress performance between the supporting rod body and the supporting rod head; and the present utility model first processes the embedded part of the supporting rod head according to the shape and size, and then assembles the embedded part of the supporting rod head with the mold core, solving the problems of fiber distortion and the decline of the stress performance of the supporting rod caused by excessive thickness during fiber winding.

[0017] 5. The present utility model uses long fibers to wind on the inner dimension mold of the supporting rod. By adjusting the winding angle, the obtained supporting rod is close to the net size of the actual formed supporting rod. It not only has less processing amount and high preparation efficiency, but also makes fewer long fibers break, enhancing the mechanical properties of the supporting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] [[ID=3@2]] Figure 1 It is a schematic structural diagram of the fiber-wound carbon-carbon supporting rod provided by the embodiment of the present utility model;

[0019] Figure 2 It is an enlarged view of the carbon-carbon support rod at point A provided by the embodiment of the present utility model;

[0020] Figure 3 It is an assembly schematic diagram of the carbon-carbon support rod and the die core provided by the embodiment of the present utility model;

[0021] Figure 4 It is a winding mode diagram of different parameters of the carbon-carbon support rod fiber provided by the embodiment of the present utility model;

[0022] Among them, (a) is single-tangent spiral winding, and (b), (c), and (d) are all multi-tangent spiral winding;

[0023] In the figure: 1. Support rod head; 2. Support rod body; 3. Embedded part of the support rod head; 31. Flared section; 32. Neck; 33. Extension section; 4. Fiber winding layer; 5. Hollow structure; 6. Die core; 61. Straight section; 62. Reduced diameter section. Detailed implementation manners

[0024] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0025] As introduced in the background technology, in the prior art, the fiber winding layer of the traditional support rod is wound thickly, the fibers are prone to twisting and wrinkling, or the processing amount is too large and the long fibers are broken, affecting the mechanical properties of the product. To solve the above technical problems, the present utility model proposes a carbon-carbon support rod with fiber winding and its preparation method.

[0026] On the one hand, the present utility model provides a carbon-carbon support rod with fiber winding, including: a support rod head and a support rod body, the support rod head and the support rod body are fixedly connected, and both are hollow structures;

[0027] The support rod head is a conical structure, including an embedded part of the support rod head and a fiber winding layer. The embedded part of the support rod head is in a hollow dumbbell shape, the fiber winding layer is arranged on the outside of the embedded part of the support rod head, the inner side of the fiber winding layer is closely attached to the embedded part of the support rod head, combined with the support rod head into an integrated body, and the outside is in a conical structure;

[0028] Both the support rod body and the fiber winding layer are fiber winding structures.

[0029] Embodiment 1

[0030] As Figures 1-4 shown, this embodiment provides a carbon-carbon support rod with fiber winding, including:

[0031] The rod head 1 and the rod body 2 are fixedly connected. The rod body 2 is a hollow circular tube structure, and the rod head 1 is a hollow cone structure, including a rod head embedded part 3 and a fiber winding layer 4. The rod head embedded part 3 is in a hollow dumbbell shape, and the fiber winding layer 4 is coated on the outside of the rod head embedded part 3, jointly forming a hollow cone structure with the rod head embedded part 3, that is, the fiber winding layer 4 is tightly attached to the outer surface of the rod head embedded part 3, and the outside of the fiber winding layer 4 is in a conical structure. Both the rod body 2 and the fiber winding layer 4 are fiber winding structures with alternating helical and circumferential windings.

[0032] The rod head embedded part 3 is in a hollow dumbbell shape, specifically including a flared section 31, a neck section 32, and an extension section 33 arranged in sequence. The flared section, the neck section 32, and the extension section are integrally connected. One end of the flared section 31 with a reduced opening is connected to the neck section 32, and the extension section 33 is arranged perpendicular to the axis of the neck section 32 and extends outward from the neck section 32 for a certain distance. In this embodiment, the material of the rod head embedded part 3 is a conventional choice, preferably a carbon-carbon material or a graphite material. The dimensions of each part of the rod head 1 are set according to actual needs. In this embodiment, preferably, the inner diameter of the neck section 32 is 11 - 13 mm in diameter, the length of the rod head 1 is 150 - 160 mm, the inner diameter of the rod body 2 is 70 - 90 mm in diameter, and the length is 900 - 1200 mm.

[0033] The flared section 31 of the rod head embedded part 3 is arranged close to the rod body 2, and the extension section 33 is arranged far from the rod body 2. The fiber winding layer 4 of the rod head 1 and the rod body 2 are integrally arranged.

[0034] Embodiment 2

[0035] This embodiment provides a preparation method for a fiber-wound carbon-carbon rod, which specifically includes the following steps:

[0036] (1) Make a rod mold according to the inner dimensions of the rod. The mold is a mold core 6, and the mold core 6 includes a straight section 61 and a reduced opening section 62. The straight section 61 is a round rod structure. The size of the mold core 6 of the straight section 61 of the mold core is Φ30×900 mm, and the size of the reduced opening section 62 of the mold core is Φ11×30 mm. The material of the rod mold can be, but is not limited to, mold steel or graphite.

[0037] (2) Processing of the rod head embedded part: Process the rod head embedded part 3 according to the size of the rod head 1 required in actuality, and process it into a dumbbell shape including a flared section 31, a neck section 32, and an extension section 33. The inner diameter of the neck section 32 is 11 mm in diameter, and the shape and size of the flared section 31 are correspondingly set with the reduced opening section 62 of the mold core 6, so that the flared section 31 can just be sleeved on the reduced opening section 62 of the mold core 6.

[0038] (3) Assembly: Sleeve the flared section 31 of the rod head embedded part 3 onto the reduced opening section 62 of the mold core 6 to obtain a rod winding mold;

[0039] (4) Rod Winding: Use long fibers to wind on the rod winding mold to obtain a preform of the rod wound with long fibers. Adopt the winding method of circumferential winding + helical fiber winding. Specifically, alternately wind in the way of winding 1 layer circumferentially and then 1 layer helically. The winding angle of circumferential winding is 90°, the winding angle of helical winding is 15°, and the winding thickness ratio of circumferential winding to helical winding is 1:1 until the outer diameter of the rod body 2 winds to 100 mm. The carbon fiber used for winding can be but not limited to dry carbon fiber, ceramic fiber or graphite fiber.

[0040] Circumferential winding is that the mold core 6 rotates uniformly around the axis, and the long fiber filament moves in the interval between the mold core 6 and the rod head embedded part 3 in the direction parallel to the axis; helical winding is that the mold core rotates uniformly around its own axis, and the long fiber filament moves repeatedly along the axis direction of the mold core 6 at a certain speed.

[0041] (5) Rod Densification Treatment: Immerse the wound rod with high residual carbon phenolic resin or furan resin, and then carbonize at 800 - 1000 °C. Repeat the impregnation - carbonization cycle until the rod density is greater than 1.4 g / cm3, and then perform high - temperature graphitization purification treatment at 1800 - 2200 °C to obtain a rough blank of the carbon - carbon rod.

[0042] (6) Carbon - Carbon Rod Machining: Machine the rough blank of the densified carbon - carbon rod to finish machining, and machine the rod head position of the rough blank into a conical structure to obtain a combined fiber - wound carbon - carbon rod.

[0043] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present invention.

Claims

1. A fiber-wound carbon-carbon support rod, characterized in that, Including: A support rod head and a support rod body, the support rod head and the support rod body are fixedly connected, and both are hollow structures; The support rod head is a conical structure, including a support rod head embedded part and a fiber winding layer. The support rod head embedded part is in the shape of a hollow dumbbell, and the fiber winding layer is arranged on the outside of the support rod head embedded part. The inner side of the fiber winding layer is closely attached to the support rod head embedded part, Combined with the support rod head into an integral body, and the outside is a conical structure; Both the support rod body and the fiber winding layer are fiber winding structures.

2. The carbon-carbon support rod wound with fibers according to claim 1, characterized in that, The support rod head embedded part includes a flared section, a neck section and an extension section arranged in sequence, and the flared section, the neck section and the extension section are integrally arranged.

3. The carbon-carbon support rod wound with fibers according to claim 2, characterized in that, The flared section of the support rod head embedded part is arranged close to the support rod body, and the extension section is arranged far from the support rod body.

4. The carbon-carbon support rod wound with fibers according to claim 1, characterized in that, The fiber winding layer of the support rod head and the support rod body are integrally arranged.

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