Experimental device for restoring damage characteristics in nuclear fuel rod pile

Abstract

The invention provides a nuclear fuel rod pile internal damage characteristic recovery experiment device, and relates to the technical field of nuclear fuel grillwork experiment devices, and the nuclear fuel rod pile internal damage characteristic recovery experiment device comprises the following steps: fixing a grillwork in an experiment box by using a first clamping assembly; the second clamping assembly is installed on the vibration assembly, and the vibration assembly is installed in the experiment box. And clamping the fuel rod by using a second clamping assembly. The vibration assembly drives the second clamping assembly and the fuel rod to vibrate, so that the fuel rod and the elastic reed rub with each other, and an abrasion experiment of the fuel rod and the grillwork elastic reed can be completed; and the fuel rod can also apply an acting force to the elastic reed, so that the fatigue test of the elastic reed can be completed. The experimental device can drive the fuel rods to repeatedly rub with the elastic reeds in the through holes of the grillwork or enable the fuel rods to repeatedly extrude the elastic reeds, so that the technical problem that an existing experimental device is difficult to meet two experiments at the same time is solved.

Description

Technical Field

[0001] The invention generally relates to the technical field of nuclear fuel grid experimental devices, and in particular to an experimental device for recovering damage characteristics in a nuclear fuel rod pile. Background Art

[0002] The current process of conducting damage characteristic restoration experiments on nuclear fuel grids includes: separate wear and fatigue experiments, both of which aim to explore the durability of the grid structure design and adjust the elastic springs of the grid design according to the experimental conditions; and then, during the actual nuclear reaction process, the elastic springs have sufficient structural strength to ensure that the grid is not damaged, resulting in a nuclear accident.

[0003] In the prior art, generally only one of the test devices for the wear test or fatigue test of the grid elastic spring is designed. The wear test process is: driving the fuel rod to move back and forth along the grid through hole direction, so that the outer surface of the fuel rod repeatedly rubs against the elastic spring in the through hole. The fatigue test is: driving the fuel rod to repeatedly squeeze the elastic spring and release it.

[0004] Due to different experimental conditions, the same experimental device can only perform one of the wear test or fatigue test. Therefore, there is currently a lack of experimental devices that can perform wear / fatigue tests on the grid at the same time. How to design an experimental device so that the same device can meet the requirements of wear and fatigue tests at the same time has become a current technical problem. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a nuclear fuel rod in-pile damage characteristic recovery experimental device.

[0006] The present invention provides a nuclear fuel rod in-pile damage characteristic recovery experimental device, wherein the grid has a through hole, and the inner side wall of the through hole has an elastic spring; the fuel rod is inserted into the through hole and abuts against the elastic spring; The device includes: Experiment box; A first clamping assembly, the first clamping assembly is installed in the experimental box and is used to clamp the grid; A vibration component, wherein the vibration component is installed in the experimental box; a second clamping assembly, the second clamping assembly being mounted on the vibration assembly and used for clamping the fuel rod; The vibration assembly is used to drive the second clamping assembly and the fuel rod to vibrate, so that the fuel rod and the elastic spring sheet rub against each other, and the fuel rod applies a force to the elastic spring sheet.

[0007] According to the technical solution provided by the present invention, the first clamping assembly includes: A support table, the support table is installed in the experimental box; A first abutment plate and a second abutment plate, wherein the first abutment plate and the second abutment plate are both mounted on the support platform; The first abutment plate is used to abut against the grid along a first direction; the second abutment plate is used to abut against the grid along a second direction; A supporting device is installed on the supporting platform and is used to abut against the grid along a third direction; the first direction, the second direction and the third direction are all horizontal directions, the first direction is perpendicular to the second direction, and the third direction has an obtuse angle with the first direction and the second direction.

[0008] According to the technical solution provided by the present invention, the supporting device comprises: a first support member, the first support member being slidably mounted on the support platform; a second support member, the second support member being telescopically mounted on the first support member along the third direction; An abutment block is fixedly mounted on the end of the second support member away from the first support member, and is used for abutting against the grid.

[0009] According to the technical solution provided by the present invention, a first adjusting member is rotatably mounted on the first supporting member; a second adjusting member is rotatably mounted on the first adjusting member; and the second adjusting member is rotatably connected to the second supporting member; The first adjusting member is used to rotate relative to the first supporting member when subjected to an external force, and the second adjusting member drives the second supporting member to extend and retract relative to the first supporting member, so that the abutting block abuts against or separates from the grid.

[0010] According to the technical solution provided by the present invention, the first adjusting member has a handle portion; the handle portion is used to drive the first adjusting member to rotate relative to the first supporting member under the action of an external force.

[0011] According to the technical solution provided by the present invention, a sliding through groove is provided on the support platform; The first support member is provided with a fastening bolt passing through the sliding slot; one end of the fastening bolt has a protrusion, and the other end is provided with a butterfly nut; Rotating the butterfly nut drives the fastening bolt to move relative to the first support member, so that the protrusion is tightly abutted against the support platform near the sliding groove to fix the relative position of the support platform and the first support member.

[0012] According to the technical solution provided by the present invention, the vibration component includes: A first linear motor guide rail, wherein the first linear motor guide rail is installed in the experimental box; a second linear motor guide rail, the second linear motor guide rail being mounted on the first linear motor guide rail; The second clamping assembly is mounted on the second linear motor guide rail; The first linear motor guide rail is used to drive the second linear motor guide rail, the second clamping assembly and the fuel rod to vibrate in a horizontal direction; The second linear motor guide rail is used to drive the second clamping assembly and the fuel rod to vibrate in a vertical direction.

[0013] According to the technical solution provided by the present invention, the second clamping assembly includes: A mounting base, the mounting base is fixedly mounted on the vibration assembly; A clamp is installed on the mounting seat and is used to clamp the fuel rod.

[0014] According to the technical solution provided by the present invention, the clamp has two semi-annular abutment portions; The two semi-annular abutting portions are closed to form a circular ring, and the end of the fuel rod is arranged between the two semi-annular abutting portions; the two semi-annular abutting portions are used to clamp the fuel rod.

[0015] According to the technical solution provided by the present invention, the clamp further has a second elastic abutment portion; When the two semi-annular abutting portions clamp the fuel rod, the second elastic abutting portion is used to abut against the end of the fuel rod to fix the relative position of the fuel rod and the clamp along the extending direction of the fuel rod.

[0016] The beneficial effects of the present invention are: The grid is fixed in the test box using the first clamping assembly; the second clamping assembly is installed on the vibration assembly, and the vibration assembly is installed in the test box; the fuel rod is clamped by the second clamping assembly. The vibration assembly drives the second clamping assembly and the fuel rod to vibrate, so that the fuel rod and the elastic spring sheet rub against each other, thereby completing the wear test of the fuel rod and the grid elastic spring sheet; the fuel rod can also apply a force to the elastic spring sheet, thereby completing the fatigue test of the elastic spring sheet. The above-mentioned experimental device can drive the fuel rod to repeatedly rub against the elastic spring sheet in the grid through hole, or make the fuel rod repeatedly squeeze the elastic spring sheet, which solves the technical problem that the existing experimental device is difficult to simultaneously meet the fatigue test and wear test of the elastic spring sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1This is a schematic diagram of the structure of the experimental device for restoring the damage characteristics of nuclear fuel rods in a pile; Figure 2 This is the front view of the experimental device; Figure 3 It is a top view of the experimental device; Figure 4 It is the side view of the experimental device; Figure 5 for Figure 3 A partial enlarged view of the middle A; Figure 6 is a schematic structural diagram of a first clamping assembly; Figure 7 for Figure 6 A partial enlarged view of point B in the middle; Figure 8 It is a top view of the grid during the movement of the fuel rods; Fig. 9 It is a top view of the through hole during the movement of the fuel rod; Fig.10 Side view of the grid for fuel rod insertion; Fig.11 A schematic diagram of a clamp holding a fuel rod; Fig.12 It is a structural schematic diagram of the fastening bolt; Among them: 1. grid; 2. through hole; 3. elastic spring; 4. fuel rod; 5. test box; 6. support table; 7. first abutment plate; 8. second abutment plate; 9. first support member; 10. second support member; 11. abutment block; 12. first adjustment member; 13. second adjustment member; 14. handle; 15. sliding groove; 16. fastening bolt; 17. butterfly nut; 18. first linear motor guide; 19. second linear motor guide; 20. mounting seat; 21. clamp; 22. box door; 23. first elastic abutment portion; 24. second elastic abutment portion; 25. semi-annular abutment portion; 26. raised portion. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] The present invention provides a nuclear fuel rod in-pile damage characteristic recovery experimental device, referring to Figure 8-10The grid 1 has a through hole 2, and the inner wall of the through hole 2 has an elastic spring 3; the fuel rod 4 is inserted into the through hole 2 and abuts against the elastic spring 3; In this embodiment, the through holes 2 of the grid 1 are arranged in the horizontal direction, and the fuel rods 4 are horizontally inserted into the through holes 2 .

[0021] refer to Figure 1-4 , the device comprises: Experiment box 5; A first clamping assembly, which is installed in the experimental box 5 and is used to clamp the grid 1; A vibration component, the vibration component is installed in the experimental box 5; A second clamping assembly, the second clamping assembly is installed on the vibration assembly and is used to clamp the fuel rod 4; Specifically, refer to Figure 1 The side of the experimental box 5 has a plurality of door structures 22, which is convenient for observing the internal situation of the experimental box 5. The door 22 has a handle to facilitate the opening and closing of the door 22. The experimental box 5 has a bottom bracket, and the bottom of the bracket has universal wheels to facilitate the movement of the experimental device.

[0022] A first clamping assembly is installed in the experimental box 5 for fixing the grid 1 in the experimental box 5 .

[0023] A vibration assembly is also installed in the experimental box 5 , and a second clamping assembly is installed on the vibration assembly. The second clamping assembly is used to clamp the fuel rod 4 .

[0024] Based on the above structural design, it can be known that in this embodiment, the grid 1 is fixed and the vibration of the fuel rods 4 is controlled to complete the experiment.

[0025] The vibration assembly is used to drive the second clamping assembly and the fuel rod 4 to vibrate, and the specific process is as follows: The vibration assembly drives the fuel rod 4 to repeatedly squeeze two adjacent elastic springs 3 in sequence. Figure 8-9 Thus, the fuel rod 4 can reciprocate and vibrate in the through hole 2 along a nearly circular trajectory, during which the fuel rod 4 repeatedly squeezes the elastic spring 3, and friction is generated between the outer wall of the fuel rod 4 and the elastic spring 3 along the circumferential direction of the outer wall of the fuel rod 4.

[0026] Since the vibration assembly in this embodiment has the above functions, the fuel rod 4 can repeatedly squeeze the elastic spring 3, and drive the fuel rod 4 to repeatedly rub against the elastic spring 3 in the through hole 2 of the grid 1, so as to realize fatigue test and wear test on the elastic spring 3, thereby solving the technical problem that the existing experimental device is difficult to meet the two experiments at the same time.

[0027] Specifically, in this embodiment, since the grid 1 is placed in a manner that the through holes 2 are arranged in the horizontal direction, two sets of first clamping assemblies can be placed along the extension direction of the fuel rod 4, and two grids 1 can be installed respectively. This method allows the same fuel rod 4 to be inserted into the through holes 2 of two grids 1 at the same time, and the experiment can be completed at the same time, saving the time required for the experiment. With the same experimental time, more experimental data can be obtained.

[0028] The following is the specific structural design of the first clamping assembly: Furthermore, the first clamping assembly comprises: A support platform 6, wherein the support platform 6 is installed in the experimental box 5; A first abutment plate 7 and a second abutment plate 8, wherein the first abutment plate 7 and the second abutment plate 8 are both mounted on the support platform 6; The first abutment plate 7 is used to abut against the grid 1 along a first direction; the second abutment plate 8 is used to abut against the grid 1 along a second direction; A supporting device is installed on the supporting platform 6 and is used to abut against the grid 1 along a third direction; the first direction, the second direction and the third direction are all horizontal directions, the first direction is perpendicular to the second direction, and the third direction has an obtuse angle with the first direction and the second direction.

[0029] Specifically, the first direction is Figure 3 The c direction in the second direction is Figure 3 The d direction in the middle, the third direction is Figure 3 The e direction in .

[0030] The grid 1 is abutted along three different horizontal directions, so that the relative position of the grid 1 and the experimental box 5 can be stably fixed. When the fuel rods 4 vibrate, the grid 1 will not vibrate accordingly, causing the experiment to fail.

[0031] Specifically, during the experiment, each through hole 2 needs to be tested once, so the through holes 2 at the lower part of the grid 1 cannot be directly tested because they are blocked by the first abutting plate 7 .

[0032] To solve the above problem, in this embodiment, the height of the first abutting plate 7 is set as follows: Case 1: If a row of the grid 1 has an even number of through holes 2, the height of the first abutment plate 7 in this embodiment only needs to be less than half of the width of the grid 1 in the vertical direction.

[0033] Case 2: If a row of the grid 1 has an odd number of through holes 2 , the difference between the height of the first abutting plate 7 and half the width of the grid 1 along the vertical direction is greater than half the width of the through hole 2 .

[0034] In this method, the first contact plate 7 only blocks the lower half of the grid 1, which is less than half of the through holes 2. Figure 6 , when the grid 1 is Figure 6 When placed in the middle manner, the first abutment plate 7 will not block the through holes 2 in the upper half of the grid 1 and the through holes 2 in the central row.

[0035] When it is necessary to conduct an experiment on the through hole 2 blocked by the first abutment plate 7, the grid 1 needs to be rotated 180 degrees with the line parallel to the extension direction of the fuel rod 4 as the axis, and then the grid 1 is installed on the first clamping assembly. At this time, the through hole 2 originally located at the bottom of the grid 1 is located at a high position, and the through hole 2 can be tested at this time.

[0036] Specifically, during the actual reaction process, the grid 1 will also produce tiny vibrations; the first abutment plate 7 is designed to be relatively low, which can ensure the stability of the bottom of the grid 1 while allowing the top of the grid 1 to produce tiny vibrations, thereby restoring the actual motion state of the grid 1 and ensuring the authenticity of the experimental data.

[0037] Further, refer to Figure 5-6 , the supporting device comprises: A first support member 9, which is slidably mounted on the support platform 6; A second support member 10, wherein the second support member 10 is telescopically mounted on the first support member 9 along the third direction; The abutment block 11 is fixedly mounted on the end of the second support member 10 away from the first support member 9 , and is used for abutting against the grid 1 .

[0038] Specifically, the first support member 9 can be slidably installed on the support platform 6, and the second support member 10 can be telescopically installed on the first support member 9 along the third direction, and an abutment block 11 is fixed on the second support member 10; thus, the structural design allows the abutment block 11 to freely adjust its position according to the shape or size of the frame 1, so that the abutment block 11 can cooperate with the first abutment plate 7 and the second abutment plate 8 to complete the clamping of frames 1 of various shapes and sizes.

[0039] Further, a first adjusting member 12 is rotatably mounted on the first supporting member 9; a second adjusting member 13 is rotatably mounted on the first adjusting member 12; and the second adjusting member 13 is rotatably connected to the second supporting member 10; Specifically, when the placement position and placement posture of the rack 1 are determined, in order to be able to switch the abutment block 11 between clamping and releasing the rack 1, if the first support member 9 is slid each time and the relative position of the first support member 9 and the support platform 6 is adjusted, the operation will be cumbersome.

[0040] In this embodiment, after the placement position and placement posture of the grid 1 are determined, the relative positions of the first support member 9 and the support platform 6 are adjusted and fixed; and then the abutment block 11 is abutted against or separated from the grid 1 by adjusting the first adjustment member 12 .

[0041] The specific adjustment methods are as follows: The first adjusting member 12 is used to rotate relative to the first supporting member 9 when subjected to external force, and the second adjusting member 13 drives the second supporting member 10 to extend and retract relative to the first supporting member 9 so that the abutting block 11 abuts against or separates from the grid 1 .

[0042] This mode is easy to operate and can make the abutment block 11 abut against or separate from the grid 1 without moving the first support member 9 .

[0043] Furthermore, in order to save more effort when driving the first adjusting member 12 to rotate relative to the first supporting member 9, in this embodiment, the first adjusting member 12 has a handle portion 14; the handle portion 14 is used to drive the first adjusting member 12 to rotate relative to the first supporting member 9 under the action of an external force. Since the handle portion 14 is relatively long and has a relatively long torque, the purpose of saving effort can be achieved according to the principle of leverage.

[0044] Further, refer to Figure 7 and Fig.12 , the support platform 6 is provided with a sliding groove 15; The first support member 9 is provided with a fastening bolt 16 passing through the sliding slot 15; the fastening bolt 16 has a protrusion 26 at one end and a butterfly nut 17 at the other end; Specifically, the relative position of the first support member 9 and the support platform 6 is adjusted by using the butterfly nut 17 and the fastening bolt 16 to pass through the sliding slot 15, which is easy to operate and convenient to use.

[0045] In this embodiment, there are two sets of fastening bolts 16 and butterfly nuts 17 to prevent the first support member 9 from rotating relative to the first support member 9 about one fastening bolt 16 , thereby ensuring that the abutment block 11 stably supports the grid 1 .

[0046] The adjustment method is: When it is necessary to fix the relative position of the support platform 6 and the first support member 9, the butterfly nut 17 is rotated forward to drive the fastening bolt 16 to move relative to the first support member 9, so that the protrusion 26 is tightly abutted against the support platform 6 near the sliding groove 15 to fix the relative position of the support platform 6 and the first support member 9.

[0047] When it is necessary to loosen the support platform 6 and the first support member 9, the butterfly nut 17 is rotated in the opposite direction to drive the fastening bolt 16 to move relative to the first support member 9, so that the protrusion 26 is separated from the support platform 6 near the sliding groove 15, and finally the support platform 6 and the first support member 9 can slide relative to each other.

[0048] Furthermore, the vibration component comprises: A first linear motor guide rail 18, wherein the first linear motor guide rail 18 is installed in the experimental box 5; A second linear motor guide rail 19, wherein the second linear motor guide rail 19 is mounted on the first linear motor guide rail 18; The second clamping assembly is mounted on the second linear motor guide rail 19; The first linear motor guide rail 18 is used to drive the second linear motor guide rail 19, the second clamping assembly and the fuel rod 4 to vibrate in the horizontal direction; The second linear motor guide rail 19 is used to drive the second clamping assembly and the fuel rod 4 to vibrate in the vertical direction.

[0049] Specifically, in order to solve the technical problem that existing experimental equipment is difficult to simultaneously meet the requirements of wear and fatigue experiments, the vibration assembly in this embodiment is provided with multiple groups of first linear motor guides 18 extending in the horizontal direction, and second linear motor guides 19 extending in the vertical direction are installed on the first linear motor guides 18.

[0050] Among them, the first linear motor guide 18 and the second linear motor guide 19 both use the LMSSA model, which can meet the vibration frequency and amplitude requirements of the experiment.

[0051] refer to Figure 2 A plurality of groups of first linear motor guide rails 18 extending in the horizontal direction are arranged in sequence in the vertical direction, and are used to install the second linear motor guide rails 19 in the experimental box in the vertical direction.

[0052] The second linear motor guide rails 19 are driven to reciprocate in the horizontal direction by multiple sets of first linear motor guide rails 18, so that the second clamping assembly can also reciprocate in the horizontal direction after clamping the fuel rod 4, thereby enabling the fuel rod 4 to repeatedly squeeze or release the elastic springs 3 on both sides of the through hole 2 of the grid 1 in the horizontal direction.

[0053] The second linear motor guide rail 19 is used to drive the second clamping assembly and the fuel rod 4 to reciprocate in the vertical direction, so that the fuel rod 4 squeezes or releases the elastic springs 3 on both sides in the vertical direction.

[0054] It reciprocates in two directions and squeezes or releases the elastic spring 3 on each side respectively, so as to complete the fatigue test of the elastic spring 3.

[0055] The superposition of the movement states of the fuel rod 4 in two directions makes the actual movement trajectory of the fuel rod 4 approximately circular, and the fuel rod 4 will not rotate under the clamping action of the second clamping assembly. Therefore, the fuel rod 4 will also generate friction with the elastic spring 3 during this movement to complete the wear test of the elastic spring 3.

[0056] Since the first linear motor guide rail 18 and the second linear motor guide rail 19 are controlled independently of each other, the fuel rod 4 can be controlled to perform experiments with different motion trajectories along two directions at different frequencies and amplitudes. This allows data of various types of experiments to be obtained, with more experimental application scenarios, and can provide more experimental data for exploring the mutual influence factors between the fuel rod 4 and the elastic spring 3 during the nuclear reaction.

[0057] Furthermore, the second clamping assembly comprises: A mounting base 20, wherein the mounting base 20 is fixedly mounted on the vibration assembly; A clamp 21 is installed on the mounting seat 20 and is used to clamp the end of the fuel rod 4.

[0058] Specifically, refer to Figure 10-11 The end of the fuel rod 4 has a concave-convex structure, and the clamp 21 tightens the concave-convex structure of the end of the fuel rod 4 to achieve stable clamping.

[0059] In order to clamp the fuel rod 4 for vibration, the second clamping assembly includes a mounting seat 20 mounted on the second linear motor guide rail 19 , and a clamp 21 mounted on the mounting seat 20 .

[0060] During the experiment, the clamp 21 clamps the fuel rod 4 and moves together with the mounting seat 20 relative to the elastic spring 3 in the through hole 2 of the grid 1 driven by the first linear motor guide 18 and the second linear motor guide 19 .

[0061] The mounting seat 20 has multiple triangular support structures. During the experiment, when the fuel rod 4 is driven to vibrate, the vibration between the fuel rod 4, the clamp 21, the mounting seat 20 and the second linear motor guide rail 19 can be reduced, thereby reducing the impact of the relative vibration between the geothermal clamping assembly and the vibration assembly on the experiment.

[0062] Further, refer to Figure 10-11 The clamp 21 itself is a conventional mechanical claw structure. In order to make the clamp 21 adapt to the required experimental requirements, the clamp 21 is additionally modified in this embodiment so that the clamp 21 has two semi-annular abutment portions 25; The two semi-annular abutting portions 25 are closed to form a circular ring, and the end of the fuel rod 4 is arranged between the two semi-annular abutting portions 25 ; the two semi-annular abutting portions 25 are used to clamp the fuel rod 4 .

[0063] Specifically, in order to stably clamp the fuel rod 4, two semi-annular abutting portions 25 are respectively installed on the clamp 21 in this embodiment, and the circular ring structure formed by the two semi-annular abutting portions 25 after closing is clamped in the concave part of the concave-convex structure at the end of the fuel rod 4. This method can prevent the clamp 21 and the fuel rod 4 from being separated from each other during the vibration process, resulting in experimental failure.

[0064] Further, refer to Figure 10-11 The clamp 21 also has a second elastic abutment portion 24; When the two semi-annular abutting portions 25 clamp the fuel rod 4 , the second elastic abutting portion 24 is used to abut against the end of the fuel rod 4 to fix the relative position of the fuel rod 4 and the clamp 21 along the extending direction of the fuel rod 4 .

[0065] Specifically, in this embodiment, the fuel rod 4 will not reciprocate along its own extension direction, but during vibration in other directions, the fuel rod 4 may also be caused to have positional deviation along its own extension direction, thereby affecting the accuracy of the experimental data.

[0066] After analysis, it can be known that the above situation is caused by at least the following reasons: shaking occurs between the clamp 21 and the mounting seat 20 , and there is a lack of a limiting shock-absorbing structure between the clamp 21 and the fuel rod 4 along the extending direction of the fuel rod 4 .

[0067] Based on the above reasons, in this embodiment, a first elastic abutting portion 23 and a second elastic abutting portion 24 made of rubber are additionally provided on the clamp 21 .

[0068] The first elastic abutment portion 23 is fixedly mounted at the angle 21 close to the mounting seat 20 and abuts against the mounting seat 20 to reduce the shaking between the clamp 21 and the mounting seat 20 during vibration and ensure stable clamping of the fuel rod 4.

[0069] The second elastic abutment 24 is fixedly mounted on the side of the fixture 21 close to the fuel rod 4 and is used to abut against the end of the fuel rod 4 so that the concave-convex structure of the fuel rod 4 abuts against the side wall of the two semi-annular abutment 25 away from the grid 1 .

[0070] During the vibration process, since the fuel rod 4 abuts against the second elastic abutment portion 24 , the second elastic abutment portion 24 can be used to buffer the vibration between the clamp 21 and the fuel rod 4 and avoid unnecessary relative positional displacement between the fuel rod 4 and the clamp 21 .

[0071] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. Nuclear fuel rod in-pile damage characteristics recovery experimental device, characterized by: The grid (1) has a through hole (2), and the inner side wall of the through hole (2) has an elastic spring (3); a fuel rod (4) is inserted into the through hole (2) and abuts against the elastic spring (3); The device includes: Experimental box (5); A first clamping assembly, the first clamping assembly being installed in the experimental box (5) and being used to clamp the grid (1); A vibration component, the vibration component is installed in the experimental box (5); a second clamping assembly, the second clamping assembly being mounted on the vibration assembly and used for clamping the fuel rod (4); The vibration assembly is used to drive the second clamping assembly and the fuel rod (4) to vibrate, so that the fuel rod (4) and the elastic spring (3) rub against each other, and the fuel rod (4) applies a force to the elastic spring (3).

2. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 1, characterized in that: The first clamping assembly comprises: A support platform (6), the support platform (6) being installed in the experimental box (5); a first abutment plate (7) and a second abutment plate (8), wherein the first abutment plate (7) and the second abutment plate (8) are both mounted on the support platform (6); The first abutment plate (7) is used to abut against the grid frame (1) along a first direction; the second abutment plate (8) is used to abut against the grid frame (1) along a second direction; A support device, the support device is mounted on the support platform (6) and is used to abut against the grid (1) along a third direction; the first direction, the second direction and the third direction are all horizontal directions, the first direction and the second direction are perpendicular to each other, and the third direction forms an obtuse angle with the first direction and the second direction.

3. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 2, characterized in that: The supporting device comprises: A first support member (9), the first support member (9) being slidably mounted on the support platform (6); a second support member (10), the second support member (10) being telescopically mounted on the first support member (9) along the third direction; An abutment block (11), the abutment block (11) being fixedly mounted on an end of the second support member (10) away from the first support member (9) and being used for abutting against the grid (1).

4. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 3, characterized in that: A first adjusting member (12) is rotatably mounted on the first supporting member (9); a second adjusting member (13) is rotatably mounted on the first adjusting member (12); and the second adjusting member (13) is rotatably connected to the second supporting member (10); The first adjusting member (12) is used to rotate relative to the first supporting member (9) when subjected to an external force, and to drive the second supporting member (10) to extend and retract relative to the first supporting member (9) via the second adjusting member (13), so that the abutting block (11) abuts against or separates from the grid (1).

5. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 4, characterized in that: The first adjusting member (12) has a handle portion (14); the handle portion (14) is used to drive the first adjusting member (12) to rotate relative to the first supporting member (9) under the action of an external force.

6. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 3, characterized in that: The support platform (6) is provided with a sliding groove (15); The first support member (9) is provided with a fastening bolt (16) passing through the sliding slot (15); one end of the fastening bolt (16) has a protrusion (26), and the other end is provided with a butterfly nut (17); Rotating the butterfly nut (17) drives the fastening bolt (16) to move relative to the first support member (9), so that the protrusion (26) is tightly abutted against the support platform (6) near the sliding groove (15), thereby fixing the relative position of the support platform (6) and the first support member (9).

7. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 1, characterized in that: The vibration assembly comprises: A first linear motor guide rail (18), wherein the first linear motor guide rail (18) is installed in the experimental box (5); A second linear motor guide rail (19), wherein the second linear motor guide rail (19) is mounted on the first linear motor guide rail (18); The second clamping assembly is mounted on the second linear motor guide rail (19); The first linear motor guide rail (18) is used to drive the second linear motor guide rail (19), the second clamping assembly and the fuel rod (4) to vibrate in a horizontal direction; The second linear motor guide rail (19) is used to drive the second clamping assembly and the fuel rod (4) to vibrate in a vertical direction.

8. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 1, characterized in that: The second clamping assembly comprises: A mounting seat (20), the mounting seat (20) being fixedly mounted on the vibration component; A clamp (21), the clamp (21) being mounted on the mounting seat (20) and being used for clamping the fuel rod (4).

9. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 8, characterized in that: The clamp (21) has two semi-annular abutment portions (25); The two semi-annular abutting portions (25) are closed to form a circular ring, and the end of the fuel rod (4) is arranged between the two semi-annular abutting portions (25); the two semi-annular abutting portions (25) are used to clamp the fuel rod (4).

10. The nuclear fuel rod in-pile damage characteristic recovery experimental device according to claim 9, characterized in that: The clamp (21) also has a second elastic abutment portion (24); When the two semi-annular abutting portions (25) clamp the fuel rod (4), the second elastic abutting portion (24) is used to abut against the end of the fuel rod (4) to fix the relative position of the fuel rod (4) and the clamp (21) along the extension direction of the fuel rod (4).

Images