Device and method for polishing oxidation film of irradiated nuclear fuel cladding tube

Abstract

The invention belongs to the technical field of inspection after irradiation, and particularly relates to a device and method for polishing an oxidation film of a nuclear fuel cladding tube after irradiation, and the device comprises a bottom plate, a rotating mechanism, a lifting mechanism, a moving mechanism, a polishing mechanism and a control system. One end of the lifting mechanism is arranged on the bottom plate, and the other end is connected with the rotating mechanism and used for controlling the rotating mechanism to move in the vertical direction; the rotating mechanism is used for clamping a cladding pipe to be polished and driving the cladding pipe to rotate in the horizontal direction; a grinding mechanism is arranged on the moving mechanism and used for controlling the grinding mechanism to horizontally get close to or get away from the rotating mechanism in the length direction of the cladding pipe; the polishing mechanism is used for polishing the outer surface, the inner surface and the end of the cladding pipe opening. And the control system is used for automatically controlling the process of polishing the oxide film of the cladding tube. According to the device and the method, the oxidation film on the surface of the cladding tube can be safely and rapidly removed, the operation time is shortened, and the irradiation dose value of workers is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of post-irradiation inspection, and specifically relates to a device and method for polishing an oxide film of a nuclear fuel cladding tube after irradiation. Background Art

[0002] Nuclear fuel assemblies are the core components of the reactor core, the "heart" of a nuclear power plant. In order to increase the economy of nuclear power plants, nuclear power plants require continuous improvement in fuel consumption, extended refueling cycles, and higher requirements for the performance of nuclear fuel cladding tubes. During the development of cladding tube materials, various mechanical property tests are required for the materials, among which internal pressure burst test, internal pressure creep test, and internal pressure fatigue test are the main test items. Before long-cycle tests such as internal pressure creep and internal pressure fatigue, the fuel cladding tube samples are required to be welded and sealed, and welding and sealing require that there is no oxide film at the joint position of the cladding tube sample, so the joint position of the cladding tube sample needs to be deoxidized. At the same time, the handling of cladding tube samples is in a radioactive environment, and manual handling will have a great impact on the health of operators. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art, namely, the problem of removing the oxide film from the cladding tube joint in a radioactive environment.

[0004] In view of this, a first aspect of the present invention provides a device for grinding oxide films on nuclear fuel cladding tubes after irradiation, which can quickly remove oxide films on the joints of cladding tube samples while minimizing operator exposure to radioactive environments.

[0005] The second aspect of the present invention provides a method for grinding the oxide film of the nuclear fuel cladding tube after irradiation, and the method uses the above-mentioned device to remove the oxide film at the joint position of the cladding tube sample.

[0006] The specific technical solutions include the following:

[0007] According to a first aspect of an embodiment of the present application, there is provided a device for polishing an oxide film of a nuclear fuel cladding tube after irradiation, comprising a base plate, a rotating mechanism, a lifting mechanism, a moving mechanism, a polishing mechanism and a control system.

[0008] Among them, one end of the lifting mechanism is arranged on the base plate, and the other end is connected to the rotating mechanism, which is used to control the movement of the rotating mechanism in the vertical direction; the rotating mechanism is used to clamp the cladding tube to be polished and drive the cladding tube to rotate in the horizontal direction; the moving mechanism is provided with the polishing mechanism, which is used to control the polishing mechanism to horizontally approach or move away from the rotating mechanism in the length direction of the cladding tube; the polishing mechanism is used to polish the outer surface, inner surface and end of the cladding tube mouth; the control system is used to automatically control the process of polishing the oxide film of the cladding tube.

[0009] Furthermore, the rotating mechanism includes a shell and a clamping structure; the shell is fixed on the lifting mechanism; the clamping structure is rotatably arranged in the shell, for clamping the cladding tube and driving the cladding tube to rotate in the horizontal direction.

[0010] Furthermore, the grinding mechanism includes an external grinding component, an internal grinding component and a support member; the external grinding component is used to grind the outer surface and the end of the cladding tube orifice, and the internal grinding component is used to grind the inner surface of the cladding tube orifice; one end of the support member is arranged on the base of the moving mechanism; the external grinding component and the internal grinding component are arranged in a vertical direction on one end of the support member away from the base, and are both parallel to the length direction of the cladding tube.

[0011] Furthermore, the external grinding assembly includes an external grinder and an external grinding head arranged at one end of the external grinder close to the rotating mechanism; the internal grinding assembly includes an internal grinder and an internal grinding head arranged at one end of the internal grinder close to the rotating mechanism.

[0012] Furthermore, the device also includes a tensioning cylinder for tensioning the grinding mechanism so that the grinding mechanism can be closely attached to the surface of the cladding tube when grinding the cladding tube.

[0013] Furthermore, the device also includes: a first servo motor, used to drive the pulley to drive the rotating mechanism to rotate; a second servo motor, used to drive the ball screw to drive the moving mechanism to move in the horizontal direction.

[0014] Furthermore, the length of the cladding tube, the rotation speed of the rotating mechanism, the movement speed of the moving mechanism, the width of the outer surface of the cladding tube to be polished, the outer polishing time, the width of the inner surface of the cladding tube to be polished, the inner polishing time and the end polishing time are input into the control system to achieve automatic control.

[0015] According to a second aspect of an embodiment of the present application, a method for polishing an oxide film of a nuclear fuel cladding tube after irradiation is provided. The method polishes the oxide film of the cladding tube by using a device as described in any of the above technical solutions, comprising the following steps:

[0016] Insert the cladding tube to be polished into the rotating mechanism and clamp it;

[0017] Use the control system to operate: control the lifting mechanism to raise the rotating mechanism to a position suitable for the grinding mechanism; control the rotating mechanism to drive the cladding tube to rotate in the horizontal direction; control the moving mechanism to move the grinding mechanism to grind the outer surface, inner surface and end of the cladding tube.

[0018] Furthermore, the step of controlling the lifting mechanism to raise the rotating mechanism to a position suitable for the grinding mechanism and controlling the moving mechanism to move the grinding mechanism to grind the outer surface, inner surface and end of the cladding tube orifice includes:

[0019] Control the lifting mechanism to move the rotating mechanism to the first position, and control the moving mechanism to move from the initial position toward the direction close to the rotating mechanism, so that the outer peripheral grinding surface of the outer grinding head is in contact with the outer surface of the cladding tube for grinding;

[0020] Controlling the moving mechanism to move in a direction away from the rotating mechanism to an intermediate position;

[0021] Control the lifting mechanism to move the rotating mechanism to the second position, and control the moving mechanism to move in a direction close to the rotating mechanism, so that the outer peripheral grinding surface of the inner grinding head is in contact with the inner surface of the cladding tube for grinding;

[0022] Controlling the moving mechanism to move in a direction away from the rotating mechanism to an intermediate position;

[0023] Control the lifting mechanism to move the rotating mechanism to the third position, and control the moving mechanism to move in a direction close to the rotating mechanism, so that the end grinding surface of the outer grinding head is in contact with the end of the cladding tube for grinding;

[0024] The moving mechanism is controlled to move to an initial position in a direction away from the rotating mechanism, and the grinding is finished.

[0025] Furthermore, the operation of using the control system includes: inputting the tube length of the cladding tube, the rotation speed of the rotating mechanism, the movement speed of the moving mechanism, the width of the outer surface of the cladding tube to be polished, the external polishing time, the width of the inner surface of the cladding tube to be polished, the internal polishing time and the end polishing time into the control system.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] In view of the need to remove the oxide film at the joint position of the cladding tube sample after irradiation, and in combination with the requirements of radioactive environment operability, the present application designs a device and method for grinding the oxide film of the cladding tube sample after irradiation, which can effectively remove the oxide film near the welding joint position of the sample and solve the problem of sealing failure caused by the oxide film. The device and method of the present application can safely and quickly remove the oxide film on the surface of the cladding tube, shorten the operation time, and reduce the radiation dose value of personnel; the control system can enable the operator to accurately control its actions through the computer, accurately realize the clamping of the sample, the speed of the grinding head and the approach to the sample, etc. The operation process is simple and has strong practicality. Secondly, the device of the present application has a compact structure, realizes modular assembly and disassembly, and is conducive to installation and transfer in a limited space in a radioactive environment; and the parts of the present invention have a simple structure, are easy to process, and have low manufacturing and installation costs. It can be widely used to remove the oxide film of the cladding tube sample after irradiation, and has good application prospects. At the same time, the removal method verified in the practical process of removing the oxide film of the cladding tube after irradiation can provide mature technical support for the subsequent re-irradiation of nuclear fuel cladding tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used to illustrate the preferred embodiments and are not to be considered as limiting the present application. In the accompanying drawings:

[0029] Figure 1 It is a side view schematic diagram of the overall structure of the embodiment of the present application;

[0030] Figure 2 A top view of the overall structure of the embodiment of the present application;

[0031] Figure 3 It is a side view schematic diagram of the rotating mechanism and the lifting mechanism of the embodiment of the present application;

[0032] Figure 4 It is a top view of the rotating mechanism and the lifting mechanism of the embodiment of the present application;

[0033] Figure 5 This is a schematic diagram of the structure of the moving mechanism of an embodiment of the present application;

[0034] Figure 6 This is a side view schematic diagram of the grinding mechanism of the embodiment of the present application;

[0035] Figure 7 This is a top view of the grinding mechanism according to an embodiment of the present application.

[0036] The reference numerals are as follows:

[0037] 1- bottom plate; 10- cladding tube; 11- dust box;

[0038] 2-rotation mechanism; 21-housing; 22-clamping structure;

[0039] 3-lifting mechanism; 4-moving mechanism; 41-base;

[0040] 5-grinding mechanism; 51-external grinding assembly; 511-external grinding machine; 512-external grinding head; 52-internal grinding assembly; 521-internal grinding machine; 522-internal grinding head; 53-supporting member;

[0041] 61-first servo motor; 62-second servo motor; 7-pulley; 8-ball screw; 9-tension cylinder. DETAILED DESCRIPTION

[0042] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0043] In view of this, according to the first aspect of an embodiment of the present application, a device for polishing the oxide film of nuclear fuel cladding tubes after irradiation is provided, comprising a base plate 1, a rotating mechanism 2, a lifting mechanism 3, a moving mechanism 4, a polishing mechanism 5 and a control system.

[0044] like Figure 1 , Figure 2 As shown, one end of the lifting mechanism 3 is arranged on the base plate 1, and the other end is connected to the rotating mechanism 2, which is used to control the rotation mechanism 2 to move in the vertical direction; the rotating mechanism 2 is used to clamp the cladding tube 10 to be polished and drive the cladding tube 10 to rotate in the horizontal direction; the moving mechanism 4 is provided with the polishing mechanism 5, which is used to control the polishing mechanism 5 to horizontally approach or move away from the rotating mechanism 2 in the length direction of the cladding tube 10; the polishing mechanism 5 is used to polish the outer surface, inner surface and end of the tube mouth of the cladding tube 10; the control system is used to automatically control the process of polishing the oxide film of the cladding tube.

[0045] Further, such as Figure 3 , Figure 4As shown, in one embodiment, the rotating mechanism 2 includes a shell 21 and a clamping structure 22; the shell 21 is fixed on the lifting mechanism 3; the clamping structure 22 is rotatably arranged in the shell 21, for clamping the cladding tube 10 and driving the cladding tube 10 to rotate in the horizontal direction.

[0046] Specifically, the clamping structure 22 is an elastic clamping device, and the contact surface between the clamping structure 22 and the cladding tube 10 is made of elastic material to avoid damage to the outer wall of the cladding tube 10 in the clamping state. The clamping structure 22 can rotate horizontally in the housing 21, thereby driving the cladding tube 10 clamped by the clamping structure 22 to rotate.

[0047] In a specific embodiment, the elastic clamping device is a tubular clamp, and a cylinder is used as a power to control the clamping or loosening of the tubular clamp. When the cylinder pushes the tubular clamp to move, the elastic material is squeezed and deformed, thereby clamping the cladding tube 10.

[0048] Further, such as Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, in one embodiment, the grinding mechanism 5 includes an external grinding component 51, an internal grinding component 52 and a support member 53; the external grinding component 51 is used to grind the outer surface and the end of the tube mouth of the cladding tube 10, and the internal grinding component 52 is used to grind the inner surface of the tube mouth of the cladding tube 10; one end of the support member 53 is arranged on the base 41 of the moving mechanism 4; the external grinding component 51 and the internal grinding component 52 are arranged in a vertical direction on the end of the support member 53 away from the base 41, and are both parallel to the length direction of the cladding tube 10.

[0049] Furthermore, the external grinding assembly 51 includes an external grinder 511 and an external grinding head 512 arranged at one end of the external grinder 511 close to the rotating mechanism 2; the internal grinding assembly 52 includes an internal grinder 521 and an internal grinding head 522 arranged at one end of the internal grinder 521 close to the rotating mechanism 2.

[0050] Specifically, the outer grinding assembly 51 and the inner grinding assembly 52 are one high and one low in the vertical direction, so that the outer surface, inner surface or end of the cladding tube 10 can be polished by adjusting the height of the rotating mechanism 2. The outer grinding head 512 has a large diameter, and its outer peripheral grinding surface is used to fit the outer surface of the cladding tube 10 for grinding, and its end grinding surface is used to fit the end of the cladding tube 10 for grinding; the inner grinding head 522 has a small diameter and can extend into the interior of the cladding tube 10 to grind the inner surface.

[0051] In a specific embodiment, the grinding mechanism 5 is driven by an air motor, and the speed of the air motor is above 10000rpm, so that the grinding efficiency is high and the grinding marks are small; the outer grinding head 512 uses a diamond grinding head with a diameter of 20mm to improve the grinding efficiency; the inner grinding head 522 uses a silicon carbide grinding head with a diameter of 8mm to avoid damaging the workpiece surface. For example, when the cladding tube 10 is a zirconium alloy tube, the surface roughness of the inner and outer surfaces after grinding reaches Ra0.8.

[0052] Further, such as Figure 6 As shown, in one embodiment, the device further includes a tensioning cylinder 9 for tensioning the grinding mechanism 5 so that the grinding mechanism 5 can be in close contact with the surface of the cladding tube 10 when grinding the cladding tube 10. Specifically, the tensioning cylinder provides grinding pressure for the outer grinding assembly 51 and the inner grinding assembly 52 during the grinding process so that the outer grinding head 512 and the inner grinding head 522 can be in close contact with the grinding surface to achieve effective grinding.

[0053] Further, in one embodiment, if Figures 1 to 4 As shown, the device also includes: a first servo motor 61, which is used to drive the pulley 7 to drive the rotating mechanism 2 to rotate; Figure 1 and Figure 5 As shown, the second servo motor 62 is used to drive the ball screw 8 to drive the moving mechanism 4 to move in the horizontal direction.

[0054] Specifically, the constant speed rotation of the first servo motor 61 is transmitted to the clamping structure 22 through the pulley 7, so that the clamping structure 22 rotates in the housing 21, thereby driving the cladding tube 10 to rotate. The moving mechanism 4 is powered by the second servo motor 62, and the ball screw 8 transmits power. The two control the moving mechanism 4 to move forward and backward, thereby driving the grinding mechanism 5 to approach or move away from the rotating mechanism 2, ensuring the accuracy of the movement.

[0055] In a specific embodiment, the ball screw 8 is provided with an initial position, an intermediate position and a limit position. When the moving mechanism 4 is located at the initial position, the device is in a waiting state, and the rotating mechanism 2 can move up and down to the desired position; when the moving mechanism 4 is located at the limit position, the outer grinding head 512 or the inner grinding head 522 is polished in accordance with the set polishing width against the outer surface or inner surface of the cladding tube 10; when the moving mechanism 4 is located at the intermediate position, the polishing mechanism 5 is away from the cladding tube 10, so that the rotating mechanism 2 can move up and down. That is, the horizontal movement of the moving mechanism 4 can facilitate the up and down movement of the rotating mechanism 2, control the polishing width, and provide loading and unloading space for the cladding tube 10. For example, when the cladding tube 10 is a zirconium alloy tube, the polishing width of its tube mouth is controlled within 5 mm.

[0056] Furthermore, in one embodiment, the length of the cladding tube 10, the rotation speed of the rotating mechanism 2, the movement speed of the moving mechanism 4, the width of the outer surface of the cladding tube 10 to be polished, the outer polishing time, the width of the inner surface of the cladding tube 10 to be polished, the inner polishing time and the end polishing time are input into the control system to achieve automatic control.

[0057] Specifically, through the control system, the entire operation process can be automated. After installing the cladding tube, set the parameters such as single grinding time and grinding position, start the program with one button, and automatically complete the entire grinding process. In a specific embodiment, since the components in the radioactive environment must be reliable and maintainable, and easy to operate by the manipulator, an assembly production situation camera is equipped to achieve visual operation. All operating surfaces can be observed on the observation window, so that operators can operate and observe production outside the radioactive environment.

[0058] Further, such as Figure 3 and Figure 4 As shown, in one embodiment, in order to collect and store the dust generated during the grinding process, a dust box 11 is provided on the outer shell 21, and the dust box 11 is located below the cladding tube 10 being grinded, which is not only convenient for collecting grinding debris, but also convenient for dumping and grabbing with a robot.

[0059] According to a second aspect of an embodiment of the present application, a method for polishing an oxide film of a nuclear fuel cladding tube after irradiation is provided. The method polishes the oxide film of the cladding tube by using a device as described in any of the above technical solutions, comprising the following steps:

[0060] Insert the cladding tube 10 to be polished into the rotating mechanism 2 and clamp it;

[0061] Use the control system to operate: control the lifting mechanism 3 to raise the rotating mechanism 2 to a position suitable for the grinding mechanism 5; control the rotating mechanism 3 to drive the cladding tube 10 to rotate in the horizontal direction; control the moving mechanism 4 to move the grinding mechanism 5 to grind the outer surface, inner surface and end of the tube mouth of the cladding tube 10.

[0062] Further, in one embodiment, the step of controlling the lifting mechanism 3 to raise the rotating mechanism 2 to a position suitable for the grinding mechanism 5 and controlling the moving mechanism 4 to move the grinding mechanism 5 to grind the outer surface, inner surface and end of the tube mouth of the cladding tube 10 includes:

[0063] Control the lifting mechanism 3 to move the rotating mechanism 2 to the first position, and control the moving mechanism 4 to move from the initial position toward the direction close to the rotating mechanism 2, so that the outer peripheral grinding surface of the outer grinding head 512 is in contact with the outer surface of the cladding tube 10 for grinding;

[0064] Control the moving mechanism 4 to move to an intermediate position in a direction away from the rotating mechanism 2;

[0065] Control the lifting mechanism 3 to move the rotating mechanism 2 to the second position, and control the moving mechanism 4 to move toward the rotating mechanism 2, so that the outer peripheral grinding surface of the inner grinding head 522 is in contact with the inner surface of the cladding tube 10 for grinding;

[0066] Control the moving mechanism 4 to move to an intermediate position in a direction away from the rotating mechanism 2;

[0067] Control the lifting mechanism 3 to move the rotating mechanism 2 to the third position, and control the moving mechanism 4 to move in a direction close to the rotating mechanism 2, so that the end grinding surface of the outer grinding head 512 is in contact with the end of the cladding tube 10 for grinding;

[0068] The moving mechanism 4 is controlled to move to the initial position in a direction away from the rotating mechanism 2, and the grinding is finished.

[0069] Specifically, the first position is a position where the outer grinding head 512 can grind the outer surface of the cladding tube 10. At this position, the moving mechanism 4 drives the outer grinding head 512 to approach and fit the outer surface of the cladding tube 10 according to the set outer surface grinding width; then grinds according to the set outer grinding time; after the grinding time is over, the moving mechanism 4 moves to the middle position and drives the outer grinding head 512 to leave the cladding tube 10. The second position is a position where the inner grinding head 522 can grind the inner surface of the cladding tube 10. At this position, the moving mechanism 4 drives the inner grinding head 522 to approach and fit the inner surface of the cladding tube 10 according to the set inner surface grinding width; then grinds according to the set inner grinding time; after the grinding time is over, the moving mechanism 4 moves to the middle position and drives the inner grinding head 522 to leave the cladding tube 10. The third position is a position where the external grinding head 512 can grind the end of the cladding tube 10. At this position, the moving mechanism 4 drives the external grinding head 512 to approach and fit the end of the cladding tube 10; then the grinding is performed according to the set end grinding time; after the grinding time ends, the moving mechanism 4 moves to the initial position and the grinding ends.

[0070] In a specific embodiment, after the end grinding is completed, since burrs may be formed in the tube opening of the cladding tube 10, the inner grinding head 522 is used again to extend into the cladding tube 10 for finishing grinding.

[0071] Furthermore, in one embodiment, the operation of using the control system includes: inputting the tube length of the cladding tube 10, the rotation speed of the rotating mechanism 2, the movement speed of the moving mechanism 4, the width of the outer surface of the cladding tube 10 to be polished, the external polishing time, the width of the inner surface of the cladding tube 10 to be polished, the internal polishing time and the end polishing time into the control system.

[0072] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for polishing the oxide film of nuclear fuel cladding tubes after irradiation, characterized in that: It comprises a base plate (1), a rotating mechanism (2), a lifting mechanism (3), a moving mechanism (4), a grinding mechanism (5) and a control system; One end of the lifting mechanism (3) is arranged on the bottom plate (1), and the other end is connected to the rotating mechanism (2), so as to control the movement of the rotating mechanism (2) in the vertical direction; The rotating mechanism (2) is used to clamp the cladding tube (10) to be polished and drive the cladding tube (10) to rotate in a horizontal direction; The moving mechanism (4) is provided with the grinding mechanism (5) for controlling the grinding mechanism (5) to horizontally approach or move away from the rotating mechanism (2) in the length direction of the cladding tube (10); The grinding mechanism (5) is used for grinding the outer surface, inner surface and end of the tube opening of the cladding tube (10); The control system is used to automatically control the process of polishing the oxide film of the cladding tube.

2. The device for polishing the oxide film of nuclear fuel cladding tube after irradiation according to claim 1 is characterized in that: The rotating mechanism (2) comprises a housing (21) and a clamping structure (22); The housing (21) is fixed on the lifting mechanism (3); The clamping structure (22) is rotatably arranged in the outer shell (21) and is used to clamp the cladding tube (10) and drive the cladding tube (10) to rotate in a horizontal direction.

3. The device for polishing the oxide film of nuclear fuel cladding tube after irradiation according to claim 1 is characterized in that: The grinding mechanism (5) comprises an outer grinding component (51), an inner grinding component (52) and a support member (53); The outer grinding component (51) is used to grind the outer surface and the end of the tube mouth of the cladding tube (10), and the inner grinding component (52) is used to grind the inner surface of the tube mouth of the cladding tube (10); One end of the support member (53) is arranged on the base (41) of the moving mechanism (4); The outer grinding assembly (51) and the inner grinding assembly (52) are arranged in a vertical direction on an end of the support member (53) away from the base (41), and are parallel to the length direction of the cladding tube (10).

4. The device for polishing the oxide film of nuclear fuel cladding tube after irradiation according to claim 3 is characterized in that: The external grinding assembly (51) comprises an external grinding machine (511) and an external grinding head (512) arranged at one end of the external grinding machine (511) close to the rotating mechanism (2); The internal grinding assembly (52) comprises an internal grinding machine (521) and an internal grinding head (522) arranged at one end of the internal grinding machine (521) close to the rotating mechanism (2).

5. The device for polishing the oxide film of nuclear fuel cladding tube after irradiation according to claim 1, characterized in that: It also comprises a tensioning cylinder (9) for tensioning the grinding mechanism (5) so that the grinding mechanism (5) can be in close contact with the surface of the cladding tube (10) when grinding the cladding tube (10).

6. The device for polishing the oxide film of nuclear fuel cladding tube after irradiation according to claim 1, characterized in that: Also includes: A first servo motor (61) is used to drive the pulley (7) to drive the rotating mechanism (2) to rotate; The second servo motor (62) is used to drive the ball screw (8) to drive the moving mechanism (4) to move in the horizontal direction.

7. The device for polishing the oxide film of nuclear fuel cladding tube after irradiation according to claim 1, characterized in that: The length of the cladding tube (10), the rotation speed of the rotating mechanism (2), the movement speed of the moving mechanism (4), the width of the outer surface of the cladding tube (10) to be polished, the outer polishing time, the width of the inner surface of the cladding tube (10) to be polished, the inner polishing time and the end polishing time are input into the control system to achieve automatic control.

8. A method for polishing the oxide film of nuclear fuel cladding tube after irradiation, characterized in that: The method comprises the following steps of grinding the oxide film of the cladding tube by using the device according to any one of claims 1 to 7: Inserting the cladding tube (10) to be polished into the rotating mechanism (2) and clamping it; Using the control system operation: Controlling the lifting mechanism (3) to raise the rotating mechanism (2) to a position suitable for the grinding mechanism (5); Controlling the rotating mechanism (3) to drive the cladding tube (10) to rotate in a horizontal direction; The moving mechanism (4) is controlled to move the grinding mechanism (5) to grind the outer surface, inner surface and end of the tube mouth of the cladding tube (10).

9. The method for polishing the oxide film of the nuclear fuel cladding tube after irradiation according to claim 8, characterized in that: The steps of controlling the lifting mechanism (3) to raise the rotating mechanism (2) to a position suitable for the grinding mechanism (5) and controlling the moving mechanism (4) to move the grinding mechanism (5) to grind the outer surface, inner surface and end of the tube mouth of the cladding tube (10) include: Controlling the lifting mechanism (3) to move the rotating mechanism (2) to a first position, and controlling the moving mechanism (4) to move from an initial position toward a direction close to the rotating mechanism (2), so that the outer peripheral grinding surface of the outer grinding head (512) is in contact with the outer surface of the cladding tube (10) for grinding; Controlling the moving mechanism (4) to move in a direction away from the rotating mechanism (2) to an intermediate position; Controlling the lifting mechanism (3) to move the rotating mechanism (2) to a second position, and controlling the moving mechanism (4) to move in a direction close to the rotating mechanism (2), so that the outer peripheral grinding surface of the inner grinding head (522) is in contact with the inner surface of the cladding tube (10) for grinding; Controlling the moving mechanism (4) to move in a direction away from the rotating mechanism (2) to an intermediate position; Controlling the lifting mechanism (3) to move the rotating mechanism (2) to a third position, and controlling the moving mechanism (4) to move in a direction close to the rotating mechanism (2), so that the end grinding surface of the external grinding head (512) is in contact with the end of the cladding tube (10) for grinding; The moving mechanism (4) is controlled to move to an initial position in a direction away from the rotating mechanism (2), and the grinding is completed.

10. The method for polishing the oxide film of the nuclear fuel cladding tube after irradiation according to claim 8, characterized in that: The use of the control system operation includes: The control system is input with the tube length of the cladding tube (10), the rotation speed of the rotating mechanism (2), the movement speed of the moving mechanism (4), the width of the outer surface of the cladding tube (10) to be polished, the outer polishing time, the width of the inner surface of the cladding tube (10) to be polished, the inner polishing time and the end polishing time.

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