A thin-walled quartz core mold clamping device and nuclear fuel cladding preform winding system

Abstract

The present invention belongs to the field of nuclear fuel technology, and in particular, relates to a thin-walled quartz core mold clamping device and a nuclear fuel cladding preform winding system. The clamping device includes a front jacket for clamping the front end of the thin-walled quartz core mold, a tail top jacket for clamping the tail end of the thin-walled quartz core mold, and a rigid shaft axially penetrating the thin-walled quartz core mold; a spring jacket is provided in the front jacket and the tail top jacket; the spring jacket is clamped outside the thin-walled quartz core mold and a flexible jacket is provided between the spring jacket and the thin-walled quartz core mold; a fixed jacket is provided outside the spring jacket. The nuclear fuel cladding preform winding system includes a thin-walled quartz core mold clamping device and a winding machine, and the winding machine is used to wind silicon carbide fibers on the thin-walled quartz core mold to obtain a nuclear fuel cladding preform. Compared with the prior art, the present invention effectively solves the problems of difficult clamping, fragility, and insufficient rigidity of the thin-walled quartz core mold in the nuclear fuel cladding preform winding process.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear fuel, and in particular relates to a thin-wall quartz core mold clamping device and a nuclear fuel cladding preform winding system. Background Art

[0002] SiC f / SiC composite material is made of silicon carbide fiber (SiC f ) is a high-performance composite material composed of a silicon carbide ceramic matrix (SiC) reinforced with SiC. f / SiC composite materials have the advantages of high temperature resistance, high strength and toughness, and oxidation resistance. They have become ideal candidate materials for hot end components in the aerospace field. Moreover, because they still have good mechanical properties and thermal shock resistance under neutron irradiation and high temperature environment, they have become the key innovation direction for future nuclear fuel accident tolerant fuel (ATF) cladding.

[0003] The preform is the skeleton of the ATF cladding tube and bears most of the load of the cladding tube. The geometric dimensions of the preform, such as thickness, roundness and straightness, have an important influence on the overall geometric dimensions of the ATF cladding. The winding molding process is one of the molding processes for the ATF cladding preform. It has the advantages of neat fiber arrangement, high accuracy, strong designability, uniform and stable product performance, and high production efficiency. The mandrel is used as a mold for winding the cladding tube preform. Its dimensional accuracy, roundness, straightness, and surface roughness have a great impact on the SiC f / SiC composite cladding preform accuracy, quality and subsequent densification effect. At the same time, according to the preparation process requirements of chemical vapor infiltration (CVI), the core mold material needs to be used for a long time above 1100 ℃, so the core mold must have good high temperature resistance. Quartz material has good high temperature resistance, small thermal expansion coefficient, and will not deform at high temperature for a long time. At the same time, it has good chemical stability. Therefore, quartz glass tube is selected as a disposable core mold. In addition, in order to facilitate the subsequent use of hydrofluoric acid pickling and demolding, thin-walled quartz tubes are often used as SiC f / SiC composite cladding preform dedicated core mold.

[0004] During the preform winding process, the two ends of the thin-walled quartz core mold are fixedly connected to the tail top through the three-jaw chuck of the winding machine, and the torque is transmitted to the thin-walled quartz core mold through the three-jaw chuck. However, quartz is a brittle material. The thin-walled quartz core mold is directly connected to the three-jaw chuck. If the clamping force is too large, the quartz core mold is easy to break under the action of the clamping force; if the clamping force is too small, the three-jaw chuck is easy to slide relative to the thin-walled quartz core mold during the winding process, which directly affects the fiber laying on the surface of the core mold according to the preset trajectory, causing the preform line shape to be chaotic. On the other hand, during the winding process, the thin-walled quartz core mold will experience radial runout due to insufficient stiffness under the action of torque, and excessive runout will cause the core mold to break.

[0005] Therefore, for the above SiC f In order to solve the problems existing in the winding process of ATF / SiC composite nuclear fuel cladding preforms, it is necessary to develop a set of clamping devices dedicated to winding of thin-walled quartz core molds and a processing system for winding ATF nuclear fuel cladding preforms using the device. Summary of the invention

[0006] The purpose of the present invention is to provide a thin-walled quartz core mold clamping device and a nuclear fuel cladding preform winding system in order to overcome the defects of the thin-walled quartz core mold in the existing winding molding process, such as difficulty in clamping, fragility, and insufficient rigidity.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention provides a thin-walled quartz core mold clamping device, comprising a front clamping sleeve for clamping the front end of the thin-walled quartz core mold, a tail top sleeve for clamping the tail end of the thin-walled quartz core mold, and a rigid shaft axially penetrating the thin-walled quartz core mold;

[0009] The front jacket and the tail jacket are both provided with spring jackets; the spring jacket is clamped outside the thin-walled quartz core mold, and a flexible jacket is provided between the spring jacket and the thin-walled quartz core mold; and a fixed jacket is provided outside the spring jacket.

[0010] Furthermore, the front jacket comprises a clamping end and a front jacket fixing end which are integrally connected.

[0011] Furthermore, the front jacket fixing end is threadedly connected to the fixing sleeve.

[0012] Furthermore, the tail top sleeve comprises a rotating end and a tail top sleeve fixed end which are integrally connected.

[0013] Furthermore, the tail top sleeve fixed end is threadedly connected to the fixed sleeve. The fixed sleeve is threadedly connected to the front jacket fixed end and the tail top sleeve fixed end respectively, and a clamping force is applied to the thin-walled quartz core mold during the tightening process, so as to better clamp and fix the two ends of the thin-walled quartz core mold during the winding process.

[0014] Furthermore, the spring clip comprises a first clamping section and a second clamping section which are integrally connected.

[0015] Furthermore, the outer surfaces of the first clamping section and the second clamping section are both tapered surfaces, and a through clamping hole is provided in the first clamping section and the second clamping section. When the spring clamp is further clamped and fixed by the fixing sleeve, the clamping hole will be reduced due to the tapered surface of the outer wall of the first clamping section and the second clamping section, thereby achieving a stable clamping of the thin-walled quartz core mold.

[0016] Furthermore, the diameter of the first clamping section increases from one end close to the center of the thin-walled quartz core mold to the direction away from the center of the thin-walled quartz core mold, and the diameter of the second clamping section decreases from one end close to the center of the thin-walled quartz core mold to the direction away from the center of the thin-walled quartz core mold.

[0017] Furthermore, the clamping force applied by the fixing sleeve is converged inwardly toward the thin-walled quartz core mold through the outer surfaces of the first clamping section and the second clamping section, which can further increase the clamping effect of the spring clamping sleeve on the thin-walled quartz core mold.

[0018] Furthermore, the conical surface of the first clamping section is coplanarly matched with the inner inclined surface of the fixing sleeve.

[0019] Furthermore, the conical surface of the second clamping section is coplanarly matched with the inner inclined surface of the tail top sleeve or the inner inclined surface of the front sleeve.

[0020] Furthermore, the maximum inner diameter of the spring jacket in a natural state is defined as D1, and the minimum inner diameter under the clamping force is defined as D2, wherein D1 is larger than the outer diameter of the flexible sleeve, and D2 is smaller than the outer diameter of the flexible sleeve.

[0021] Furthermore, the thin-walled quartz core mold has a length of 200-4000 mm, an outer diameter of 5-15 mm, and a wall thickness of 0.5-1.5 mm.

[0022] Furthermore, the length of the rigid shaft is greater than the length of the thin-walled quartz core mold, and both ends of the rigid shaft extend out 20-40 mm after passing through the thin-walled quartz core mold.

[0023] Furthermore, the difference between the outer diameter of the rigid shaft and the inner diameter of the thin-walled quartz core mold is 0.1-0.2 mm.

[0024] Furthermore, the rigid shaft can be made of a solid or hollow rod, and its material can be made of high-strength materials such as corundum and stainless steel.

[0025] Furthermore, the inner diameter of the flexible sleeve in a natural state is smaller than the outer diameter of the thin-walled quartz core mold, with a difference of 0.1-0.3 mm, to ensure that the flexible sleeve can be tightly mounted on the end of the thin-walled quartz core mold. The flexible sleeve expands evenly in the radial direction under the clamping force, which is beneficial to improving the coaxiality of the thin-walled quartz core mold and the chuck.

[0026] Furthermore, the flexible sleeve can be made of elastic materials with a large friction coefficient, such as nitrile rubber or silicone, which can protect the thin-walled quartz core mold under the clamping force and prevent the thin-walled quartz core mold and the chuck from slipping through the friction between the two.

[0027] Furthermore, a plurality of grooves are formed on the outer surface of the fixing sleeve along the axial direction, and a matching crescent wrench can be used to tighten the fixing sleeve.

[0028] The present invention also provides a nuclear fuel cladding preform winding system including the above-mentioned thin-walled quartz core mold clamping device, and also includes a winding machine; the winding machine is used to wind silicon carbide fibers on the thin-walled quartz core mold to obtain an ATF cladding preform.

[0029] Furthermore, the front jacket of the thin-walled quartz core mold clamping device is connected to the multi-jaw chuck of the winding machine, and the multi-jaw chuck drives the thin-walled quartz core mold to rotate around the axis through the front jacket.

[0030] Furthermore, the tail top sleeve of the thin-walled quartz core mold clamping device is connected to the tail top of the winding machine, and the tail top sleeve can rotate inside the tail top when the thin-walled quartz core mold rotates.

[0031] Furthermore, a plurality of clamping planes are evenly distributed on the contact surface between the front clamping sleeve and the multi-jaw chuck, and the number of the clamping planes is consistent with the number of clamping jaws on the multi-jaw chuck.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The thin-walled quartz core mold clamping device of the present invention is used to increase the rigidity of the thin-walled quartz core mold by setting a rigid shaft that penetrates the thin-walled quartz core mold along the axial direction; at the same time, the two ends of the thin-walled quartz core mold are clamped by the front clamping sleeve and the tail top sleeve, and the clamping force is transmitted to the thin-walled quartz core mold under the cooperation of the fixed sleeve and the flexible sleeve, which plays the role of coaxially fixing the thin-walled quartz core mold, thereby solving the defects of the thin-walled quartz core mold being difficult to clamp, fragile, and insufficient rigidity during the winding process.

[0034] (2) The thin-walled quartz core mold clamping device of the present invention can protect the thin-walled quartz core mold under the clamping force by providing a flexible sleeve sleeved on the outside of the core mold. Based on its good elasticity and friction, it can also prevent the thin-walled quartz core mold from slipping during the winding process.

[0035] (3) The front sleeve and the tail sleeve of the present invention can be respectively connected to the fixed sleeve by threads, and in cooperation with the end face of the spring sleeve, the spring sleeve is radially compressed during the tightening process to reduce the clamping hole. The spring sleeve transmits the clamping force to the thin-walled quartz core mold through the flexible sleeve, thereby playing the role of coaxially fixing the thin-walled quartz core mold.

[0036] (4) The thin-walled quartz core mold clamping device of the present invention is suitable for SiC f The connection and transmission between the winding machine and the thin-walled quartz core mold during the winding molding of the SiC composite material cladding preform has the characteristics of simple structure, safety, easy clamping and protection of the thin-walled quartz core mold, which is beneficial to the SiC f Winding molding of / SiC composite material cladding preform. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural diagram of the thin-walled quartz core mold clamping device of the present invention.

[0038] Figure 2 It is a cross-sectional view of the thin-walled quartz core mold clamping device of the present invention.

[0039] Figure 3 It is a schematic structural diagram of the front jacket of the thin-walled quartz core mold clamping device of the present invention.

[0040] Figure 4 It is a schematic structural diagram of the tail top sleeve of the thin-walled quartz core mold clamping device of the present invention.

[0041] Figure 5 It is a schematic structural diagram of a fixing sleeve of a thin-walled quartz core mold clamping device of the present invention.

[0042] Figure 6 It is a schematic structural diagram of the spring jacket of the thin-walled quartz core mold clamping device of the present invention.

[0043] Figure 7 It is a schematic structural diagram of the flexible sleeve of the thin-walled quartz core mold clamping device of the present invention.

[0044] Figure 8 It is a schematic diagram of the structure of the rigid shaft of the thin-walled quartz core mold clamping device of the present invention.

[0045] Fig. 9 It is a schematic structural diagram of the nuclear fuel cladding preform winding system of the present invention.

[0046] Description of the markings in the figure:

[0047] 1-Thin-wall quartz core mold;

[0048] 2-front jacket, 21-clamping end, 22-front jacket fixing end, 23-clamping plane;

[0049] 3-tail top sleeve, 31-rotating end, 32-tail top sleeve fixed end;

[0050] 4- Rigid axis;

[0051] 5-spring jacket, 51-first clamping section, 52-second clamping section, 53-clamping hole;

[0052] 6-Flexible sleeve;

[0053] 7-Fixed sleeve;

[0054] 8-Multi-jaw chuck;

[0055] 9-Tail top. DETAILED DESCRIPTION

[0056] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0057] In the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0059] Example 1

[0060] The present embodiment provides a thin-walled quartz core mold clamping device, which includes a front jacket 2, a tail top jacket 3 and a rigid shaft 4. The front jacket 2 is used to clamp the front end of the thin-walled quartz core mold 1, and the tail top jacket 3 is used to clamp the tail end of the thin-walled quartz core mold 1. The rigid shaft 4 axially penetrates the thin-walled quartz core mold 1 and is coaxially arranged with the thin-walled quartz core mold 1, and is used to increase the rigidity of the thin-walled quartz core mold 1, so as to solve the problem of insufficient rigidity of the thin-walled quartz core mold 1 during the winding process.

[0061] A spring jacket 5 is provided inside the front jacket 2 and the tail top jacket 3. The spring jacket 5 is clamped outside the thin-walled quartz core mold 1, and a flexible sleeve 6 is provided between the spring jacket 5 and the thin-walled quartz core mold 1. A fixing sleeve 7 is provided outside the spring jacket 5, and the fixing sleeve 7 is used to radially compress the spring jacket 5 during the tightening process. The spring jacket 5 transmits the clamping force to the thin-walled quartz core mold 1 through the flexible sleeve 6, and plays the role of coaxially fixing the thin-walled quartz core mold 1. The flexible sleeve 6 can protect the thin-walled quartz core mold 1 under the clamping force, and can also prevent the thin-walled quartz core mold 1 from slipping during the winding process.

[0062] Example 2

[0063] This embodiment provides a thin-walled quartz core mold clamping device, which includes a front jacket 2 for clamping the front end of the thin-walled quartz core mold 1, a tail top jacket 3 for clamping the tail end of the thin-walled quartz core mold 1, and a rigid shaft 4 axially penetrating the thin-walled quartz core mold 1. A spring jacket 5 is provided inside the front jacket 2 and the tail top jacket 3, and the spring jacket 5 is clamped outside the thin-walled quartz core mold 1, and a flexible sleeve 6 is provided between the spring jacket 5 and the thin-walled quartz core mold 1. A fixed sleeve 7 is provided outside the spring jacket 5.

[0064] The front jacket 2 of this embodiment includes an integrally connected clamping end 21 and a front jacket fixed end 22, wherein the clamping end 21 is used to connect with the multi-claw chuck 8 of the winding machine, and the front jacket fixed end 22 is threadedly connected with the fixed sleeve 7. The tail top sleeve 3 includes an integrally connected rotating end 31 and a tail top sleeve fixed end 32, wherein the rotating end 31 can rotate in the tail top 9 of the winding machine, and the tail top sleeve fixed end 32 is threadedly connected with the fixed sleeve 7. The fixed sleeve 7 is threadedly connected with the front jacket fixed end 22 and the tail top sleeve fixed end 32 respectively, and a clamping force is applied to the thin-walled quartz core mold 1 during the tightening process, so as to better clamp and fix the two ends of the thin-walled quartz core mold 1 during the winding process.

[0065] Example 3

[0066] This embodiment provides a thin-walled quartz core mold clamping device, which includes a front jacket 2 for clamping the front end of the thin-walled quartz core mold 1, a tail top jacket 3 for clamping the tail end of the thin-walled quartz core mold 1, and a rigid shaft 4 axially penetrating the thin-walled quartz core mold 1. A spring jacket 5 is provided inside the front jacket 2 and the tail top jacket 3, and the spring jacket 5 is clamped outside the thin-walled quartz core mold 1, and a flexible sleeve 6 is provided between the spring jacket 5 and the thin-walled quartz core mold 1. A fixed sleeve 7 is provided outside the spring jacket 5.

[0067] The spring clamp 5 of this embodiment includes a first clamping section 51 and a second clamping section 52 which are integrally connected. The outer surfaces of the first clamping section 51 and the second clamping section 52 are both conical surfaces, and a through clamping hole 53 is provided in the first clamping section 51 and the second clamping section 52 for clamping the thin-walled quartz core mold 1. The diameter of the first clamping section 51 increases from the end close to the center of the thin-walled quartz core mold 1 to the direction away from the center of the thin-walled quartz core mold 1, and the diameter of the second clamping section 52 decreases from the end close to the center of the thin-walled quartz core mold 1 to the direction away from the center of the thin-walled quartz core mold 1, that is, the clamping force applied by the fixed sleeve 7 converges inwardly toward the thin-walled quartz core mold 1 through the outer surfaces of the first clamping section 51 and the second clamping section 52, which can further increase the clamping effect of the spring clamp 5 on the thin-walled quartz core mold 1.

[0068] The conical surface of the first clamping section 51 of this embodiment is coplanar with the inner inclined surface of the fixing sleeve 7, and the conical surface of the second clamping section 52 is coplanar with the inner inclined surface of the tail top sleeve 3 or the inner inclined surface of the front clamping sleeve 2. The outer surface of the fixing sleeve 7 is provided with three grooves in the axial direction, and can be tightened with a matching crescent wrench. When the spring clamping sleeve 5 is further clamped and fixed by the fixing sleeve 7, the clamping hole 53 will be reduced due to the effect of the conical surface of the outer wall of the first clamping section 51 and the second clamping section 52, thereby achieving a stable clamping of the thin-walled quartz core mold 1.

[0069] Example 4

[0070] This embodiment provides a thin-walled quartz core mold clamping device, which includes a front jacket 2 for clamping the front end of the thin-walled quartz core mold 1, a tail top jacket 3 for clamping the tail end of the thin-walled quartz core mold 1, and a rigid shaft 4 axially penetrating the thin-walled quartz core mold 1. A spring jacket 5 is provided inside the front jacket 2 and the tail top jacket 3, and the spring jacket 5 is clamped outside the thin-walled quartz core mold 1, and a flexible sleeve 6 is provided between the spring jacket 5 and the thin-walled quartz core mold 1. A fixed sleeve 7 is provided outside the spring jacket 5.

[0071] The difference from Example 3 is that the maximum inner diameter of the spring jacket 5 in the natural state (i.e., the diameter of the clamping hole 53) is defined as D1; ​​the inner diameter of the spring jacket 5 is reduced under the clamping force, and its minimum inner diameter is D2. D1 is larger than the outer diameter of the flexible sleeve 6, and D2 is smaller than the outer diameter of the flexible sleeve 6. Therefore, under the clamping action of the fixed sleeve 7, the clamping force can be transmitted to the thin-walled quartz core mold 1 to the greatest extent, thereby playing a clamping role.

[0072] Example 5

[0073] This embodiment provides a thin-walled quartz core mold clamping device, which includes a front jacket 2 for clamping the front end of the thin-walled quartz core mold 1, a tail top jacket 3 for clamping the tail end of the thin-walled quartz core mold 1, and a rigid shaft 4 axially penetrating the thin-walled quartz core mold 1. A spring jacket 5 is provided inside the front jacket 2 and the tail top jacket 3, and the spring jacket 5 is clamped outside the thin-walled quartz core mold 1, and a flexible sleeve 6 is provided between the spring jacket 5 and the thin-walled quartz core mold 1. A fixed sleeve 7 is provided outside the spring jacket 5.

[0074] The inner diameter of the flexible sleeve 6 in the present embodiment is smaller than the outer diameter of the thin-walled quartz core mold 1 in the natural state, and the difference is 0.1-0.3mm, so as to ensure that the flexible sleeve 6 can be relatively tightly sleeved on the end of the thin-walled quartz core mold 1. The flexible sleeve 6 expands uniformly in the radial direction under the clamping force, which is conducive to improving the coaxiality of the thin-walled quartz core mold 1 and the multi-jaw chuck 8. The flexible sleeve 6 in the present embodiment can be made of elastic materials with a large friction coefficient such as nitrile rubber or silicone, which can protect the thin-walled quartz core mold 1 under the clamping force, and can prevent the thin-walled quartz core mold 1 and the multi-jaw chuck 8 from slipping through the friction between the two.

[0075] Example 6

[0076] This embodiment provides a thin-walled quartz core mold clamping device, which includes a front jacket 2 for clamping the front end of the thin-walled quartz core mold 1, a tail top jacket 3 for clamping the tail end of the thin-walled quartz core mold 1, and a rigid shaft 4 axially penetrating the thin-walled quartz core mold 1. A spring jacket 5 is provided inside the front jacket 2 and the tail top jacket 3, and the spring jacket 5 is clamped outside the thin-walled quartz core mold 1, and a flexible sleeve 6 is provided between the spring jacket 5 and the thin-walled quartz core mold 1. A fixed sleeve 7 is provided outside the spring jacket 5.

[0077] The clamping device of this embodiment is suitable for the thin-walled quartz core mold 1 with a length of 200-4000mm, an outer diameter of 5-15mm, and a wall thickness of 0.5-1.5mm. The rigid shaft 4 axially penetrates the thin-walled quartz core mold 1 and is coaxially arranged with the thin-walled quartz core mold 1 to increase the rigidity of the thin-walled quartz core mold 1. The length of the rigid shaft 4 is greater than the length of the thin-walled quartz core mold 1, and the two ends of the rigid shaft 4 after penetrating the thin-walled quartz core mold 1 extend 20-40mm respectively. The difference between the outer diameter of the rigid shaft 4 and the inner diameter of the thin-walled quartz core mold 1 is 0.1-0.2mm. The rigid shaft 4 of this embodiment can be selected from a solid or hollow rod, and the material is selected from high-strength materials such as corundum and stainless steel.

[0078] Example 7

[0079] This embodiment provides a nuclear fuel cladding preform winding system, including the thin-walled quartz core mold clamping device described in Example 1, and also includes a winding machine. The clamping device is used to firmly clamp the two ends of the thin-walled quartz core mold 1, and can be used for winding thin-walled tube core molds (including but not limited to quartz, metal, ceramic and other materials) with an outer diameter of 5-15mm, a wall thickness of 0.5-1.5mm, and a length of 200-4000mm; the winding machine is used to wind silicon carbide fibers on the thin-walled quartz core mold 1 to obtain an ATF cladding preform.

[0080] The front jacket 2 of the thin-walled quartz core mold clamping device of this embodiment is connected to the multi-jaw chuck 8 of the winding machine, and the multi-jaw chuck 8 drives the thin-walled quartz core mold 1 to rotate around the axis through the front jacket 2. The contact surface between the front jacket 2 and the multi-jaw chuck 8 is evenly distributed with multiple clamping planes 23 processed by milling, and the number of clamping planes 23 is consistent with the number of jaws on the multi-jaw chuck 8, which is convenient for the multi-jaw chuck 8 to clamp. The multi-jaw chuck 8 of this embodiment can use the three-jaw chuck commonly used in industry, and the multi-jaw chuck 8 is connected to a driving motor that can drive it to rotate. The tail top sleeve 3 of the thin-walled quartz core mold clamping device of this embodiment is connected to the tail top 9 of the winding machine, and the tail top sleeve 3 can rotate in the tail top 9 under the rotation of the thin-walled quartz core mold 1.

[0081] The nuclear fuel cladding preform winding system of the present embodiment can stably clamp the mold for winding the nuclear fuel cladding preform (i.e., the thin-walled quartz core mold 1), and at the same time, the front end of the thin-walled quartz core mold 1 can be clamped and fixed by the multi-jaw chuck 8, and the tail end can rotate in the tail top 9. After the wire nozzle of the winding machine is in place, the silicon carbide fiber can be wound on the thin-walled quartz core mold 1 to obtain the ATF nuclear fuel cladding preform, and then after the CVI process, the nuclear fuel silicon carbide ceramic tube used in the nuclear fuel stack can be obtained.

[0082] Example 8

[0083] This embodiment provides a winding process flow of a nuclear fuel cladding preform, which mainly includes clamping and fixing a thin-walled quartz core mold 1 and winding silicon carbide fibers. The specific steps are as follows:

[0084] S1: insert the rigid shaft 4 into the thin-walled quartz core mold 1, leaving 20mm-40mm at both ends, and increase the rigidity of the thin-walled quartz core mold 1 through the rigid shaft 4, thereby solving the problem of insufficient rigidity of the thin-walled quartz core mold 1 during the winding process;

[0085] S2: Put the fixed sleeve 7 on the outside of the thin-walled quartz core mold 1, and the ends of the fixed sleeve 7 are respectively facing the clamping end of the winding machine and the tail top 9 end;

[0086] S3: Put the flexible sleeve 6 on the ends of both sides of the thin-walled quartz core mold 1 respectively, so that the ends of the flexible sleeve 6 are flush with the ends of the thin-walled quartz core mold 1;

[0087] S4: Insert both sides of the thin-walled quartz core mold 1 with the rigid shaft 4 inside and the flexible sleeve 6 outside the end into the clamping holes 53 of the spring jacket 5 respectively, and the insertion depth is the length of the flexible sleeve 6;

[0088] S5: Fix the clamping end 21 of the front jacket 2 on the multi-jaw chuck 8 of the winding machine, and the three clamping planes 23 of the clamping end 21 are coplanar with the clamping claws of the multi-jaw chuck 8, and tighten them with a special wrench for the three-jaw chuck;

[0089] S6: Insert the spring jackets 5 at both ends into the front jacket 2 and the tail top jacket 3 respectively, and the conical surfaces of the spring jacket 5 are parallel to the inclined surfaces inside the front jacket 2 and the tail top jacket 3 respectively;

[0090] S7: Use a wrench to rotate the fixed sleeve 7 outside the front jacket 2 so that it can be threadedly matched with the outer surface of the clamping end 21 of the front jacket 2. During the tightening process, the spring jacket 5 is squeezed by the inner inclined surface of the front jacket 2, generating a radial clamping force applied to the flexible sleeve 6, and then the flexible sleeve 6 transmits the clamping force to the thin-walled quartz core mold 1; similarly, use a wrench to rotate the fixed sleeve 7 outside the tail top sleeve 3 so that it can be threadedly matched with the outer surface of the fixed end 32 of the tail top sleeve, so that the thin-walled quartz core mold 1 at the tail top 9 end is clamped;

[0091] S8: After the clamping is completed, the winding machine and the winding program are turned on, and after the wire nozzle is in place, the silicon carbide fiber is fixed at the desired position and the winding is started, so that the silicon carbide fiber is wound on the surface of the thin-walled quartz core mold 1 according to the position set by the program, and finally an ATF nuclear fuel cladding preform is obtained on the thin-walled quartz core mold 1.

[0092] In this embodiment, the rigid shaft 4 is inserted into the thin-walled quartz core mold 1 and is coaxially matched with it to increase the rigidity of the thin-walled quartz core mold 1, thereby solving the problem of insufficient rigidity of the thin-walled quartz core mold 1 during winding. The front jacket 2 is fixed to the multi-claw chuck 8 of the winding machine, and the tail top sleeve 3 is connected to the tail top 9 of the winding machine. The outer surfaces of the two ends of the thin-walled quartz core mold 1 are respectively inserted into the flexible sleeve 6, and then the end of the spring jacket 5 is inserted, and is threadedly connected to the front jacket 2 and the tail top sleeve 3 through the fixed sleeve 7, and the front jacket 2, the tail top sleeve 3 and the end face of the spring jacket 5 are matched to radially compress the spring jacket 5 during the tightening process. The spring jacket 5 transmits the clamping force to the thin-walled quartz core mold 1 through the flexible sleeve 6, which plays the role of coaxially fixing the thin-walled quartz core mold 1. In addition, the flexible sleeve 6 is made of materials with a large friction coefficient with quartz, such as silicone or nitrile rubber, which not only protects the thin-walled quartz core mold 1 under the clamping force, but also prevents the thin-walled quartz core mold 1 and the multi-jaw chuck 8 from slipping through the friction between the two. After the two ends of the thin-walled quartz core mold 1 are firmly clamped, the winding of silicon carbide fibers can be started, and the products after fiber winding can be made into nuclear fuel silicon carbide ceramic tubes for nuclear fuel reactors after CVI process treatment.

[0093] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A thin-walled quartz core mold clamping device, characterized in that: It comprises a front clamping sleeve (2) for clamping the front end of the thin-walled quartz core mold (1), a tail top sleeve (3) for clamping the tail end of the thin-walled quartz core mold (1), and a rigid shaft (4) axially penetrating the thin-walled quartz core mold (1); The front jacket (2) and the tail jacket (3) are both provided with spring jackets (5); the spring jacket (5) is clamped outside the thin-walled quartz core mold (1), and a flexible sleeve (6) is provided between the spring jacket (5) and the thin-walled quartz core mold (1); and a fixed sleeve (7) is provided outside the spring jacket (5); The front jacket (2) comprises a clamping end (21) and a front jacket fixing end (22) which are integrally connected; the front jacket fixing end (22) is threadedly connected to the fixing sleeve (7); The tail top sleeve (3) comprises a rotating end (31) and a tail top sleeve fixed end (32) which are integrally connected; the tail top sleeve fixed end (32) is threadedly connected to the fixed sleeve (7); The length of the rigid shaft (4) is greater than the length of the thin-walled quartz core mold (1), and the two ends of the rigid shaft (4) extend out of the thin-walled quartz core mold (1) after passing through the thin-walled quartz core mold (1); The spring clamp (5) comprises a first clamping section (51) and a second clamping section (52) which are integrally connected; the outer surfaces of the first clamping section (51) and the second clamping section (52) are both conical surfaces, and the first clamping section (51) and the second clamping section (52) are provided with through clamping holes (53); the conical surface of the first clamping section (51) is coplanar with the internal inclined surface of the fixing sleeve (7); and the conical surface of the second clamping section (52) is coplanar with the internal inclined surface of the tail top sleeve (3) or the internal inclined surface of the front clamp (2).

2. A thin-walled quartz core mold clamping device according to claim 1, characterized in that: The maximum inner diameter of the spring jacket (5) in a natural state is defined as D1, and the minimum inner diameter under the action of the clamping force is defined as D2, wherein D1 is greater than the outer diameter of the flexible jacket (6), and D2 is less than the outer diameter of the flexible jacket (6).

3. A thin-walled quartz core mold clamping device according to claim 1, characterized in that: The thin-walled quartz core mold (1) has a length of 200-4000 mm, an outer diameter of 5-15 mm, and a wall thickness of 0.5-1.5 mm.

4. A thin-walled quartz core mold clamping device according to claim 1, characterized in that: The rigid shaft (4) extends out 20-40 mm at both ends after passing through the thin-walled quartz core mold (1); The difference between the outer diameter of the rigid shaft (4) and the inner diameter of the thin-walled quartz core mold (1) is 0.1-0.2 mm.

5. A thin-walled quartz core mold clamping device according to claim 1, characterized in that: The inner diameter of the flexible sleeve (6) in a natural state is smaller than the outer diameter of the thin-walled quartz core mold (1), with the difference being 0.1-0.3 mm.

6. A nuclear fuel cladding preform winding system comprising the thin-walled quartz core mold clamping device according to any one of claims 1 to 5, characterized in that: It also includes a winding machine, which is used to wind silicon carbide fibers on the thin-walled quartz core mold (1) to produce a nuclear fuel cladding preform; The front jacket (2) of the thin-walled quartz core mold clamping device is connected to the multi-jaw chuck (8) of the winding machine, and the multi-jaw chuck (8) drives the thin-walled quartz core mold (1) to rotate around the axis through the front jacket (2); The tail top sleeve (3) of the thin-walled quartz core mold clamping device is connected to the tail top (9) of the winding machine, and the tail top sleeve (3) can rotate inside the tail top (9) when the thin-walled quartz core mold (1) rotates.

7. The nuclear fuel cladding preform winding system according to claim 6, characterized in that: A plurality of clamping planes (23) are evenly distributed on the contact surface between the front clamping sleeve (2) and the multi-jaw chuck (8), and the number of the clamping planes (23) is consistent with the number of clamping jaws on the multi-jaw chuck (8).

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