Nuclear fuel rod bundle assembly platform

Abstract

The present invention belongs to the manufacturing technology of nuclear fuel assembly, and specifically relates to a nuclear fuel rod bundle assembly platform, including a support seat, an upper tube seat clamp, a positioning grid clamp and a lower tube seat clamp installed on an operating platform, the support seat includes a base, a positioning tube and a positioning tube flange; an oblique keyway is processed on the upper end of the base, a positioning tube flange is installed in the oblique keyway, and the positioning tube flange is fixed to the positioning tube; the positioning tube flange can move in the oblique keyway; the clamping height of the support seat is equal to the clamping height of the upper tube seat clamp, the positioning grid clamp and the upper tube seat clamp. The support seat provides a 45-degree sliding mode for clamping structural parts such as rod bundles, and the matching positioning grid clamp and tube seat clamp play a role in firmly clamping and positioning the corresponding structural parts, ensuring that the rod bundle moves away from the clamp in a 45-degree direction, which can avoid the clamp from hanging on the rod bundle, and at the same time, the structural parts move smoothly, ensuring the accuracy and reliability of the rod bundle assembly.

Description

Technical Field

[0001] The invention belongs to nuclear fuel assembly manufacturing technology, and in particular relates to a nuclear fuel rod bundle assembly platform. Background Art

[0002] Fuel assemblies usually consist of fuel rods and upper tube sockets, positioning grids, and lower tube sockets.

[0003] The main function of the fuel assembly assembly platform is to push the component rods into the frame after it is fixed by the clamp on the assembly platform, flip the rod bundle after it is assembled, and lift the rod bundle off the assembly platform. However, after the existing assembly platform is flipped, the rod bundle needs to be manually moved a little away from the assembly platform clamp to prevent the clamp from scratching the rod bundle. Summary of the invention

[0004] The object of the present invention is to provide a nuclear fuel rod bundle assembly platform, which can realize the rod bundle moving away from the clamp in a direction of 45 degrees, thereby preventing the clamp from damaging the rod bundle.

[0005] The technical solution of the present invention is as follows:

[0006] A nuclear fuel rod bundle assembly platform comprises a support seat, an upper tube seat clamp, a positioning grid clamp and a lower tube seat clamp installed on an operating platform, wherein the support seat comprises a base, a positioning tube and a positioning tube flange in the vertical direction; an oblique key groove is processed on the upper end of the base, a positioning tube flange is installed in the oblique key groove, and the positioning tube flange is fixed to the positioning tube in the horizontal direction; the positioning tube flange can move in the oblique key groove; the clamping height of the support seat is equal to the clamping height of the upper tube seat clamp, the positioning grid clamp and the lower tube seat clamp.

[0007] The end of the positioning cylinder flange is connected to the positioning cylinder cover plate, and the positioning cylinder cover plate and the positioning cylinder flange are fixed by hexagonal bolts.

[0008] A through hole is processed at the outer end of the oblique keyway, a push rod is arranged in the through hole, and the lower end of the push rod is positioned with the positioning tube flange through a groove.

[0009] The upper end of the push rod is locked and fixed by a nut.

[0010] The positioning tube flange is fixed to the positioning tube via hexagon socket countersunk screws.

[0011] A spring is arranged between the base and the positioning cylinder flange.

[0012] The inclination angle of the oblique keyway is 30 to 60 degrees.

[0013] The positioning grid clamp comprises a clamp body, a support block, a pressure block, a movable beam, a movable pressure block and a movable column; the cross section of the clamp body is L-shaped, a movable column in the vertical direction is fixed to the front end of the clamp body, and a movable beam in the horizontal direction is fixed above the clamp body and the movable column; a support block and a pressure block in the vertical direction are fixed to the inner side of the vertical part of the clamp body, and a support block and a pressure block in the horizontal direction are fixed to the inner side of the horizontal part; a movable pressure block in the vertical direction is fixed to the inner side of the movable column, and a movable pressure block in the horizontal direction is fixed to the inner side of the movable beam.

[0014] The clamping surfaces of the pressing block and the movable pressing block are processed with grooves with chamfered sides.

[0015] The upper tube seat clamp and the lower tube seat clamp have the same structure, including a tube seat clamp body, a tube seat support block, a tube seat pressure block, a tube seat movable crossbeam, a tube seat movable pressure block and a tube seat movable column; the tube seat clamp body has an L-shaped cross section, and a vertical tube seat movable column is fixedly provided at the front end of the tube seat clamp body, and a horizontal tube seat movable crossbeam is fixedly provided above the tube seat clamp body and the tube seat movable column; the vertical tube seat support block and the tube seat pressure block are fixed to the inner side of the vertical part of the tube seat clamp body, and the horizontal tube seat support block and the tube seat pressure block are fixed to the inner side of the horizontal part; the vertical tube seat movable pressure block is fixed to the inner side of the tube seat movable column, and the horizontal tube seat movable pressure block is fixed to the inner side of the tube seat movable crossbeam.

[0016] The significant effects of the present invention are as follows: the designed support seat provides a 45-degree sliding mode for clamping the rod bundle and other structural parts, and the sliding distance can ensure that the positioning tube can well cover the lower pipe seat to facilitate the lifting work. At the same time, the matching positioning grid clamp and pipe seat clamp are designed to play a role in firmly clamping and positioning the corresponding structural parts, ensuring that the rod bundle moves away from the clamp in a 45-degree direction, which can avoid the clamp from hanging the rod bundle, and at the same time, the structural parts move smoothly, ensuring the accuracy and reliability of the rod bundle assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the nuclear fuel bundle assembly platform;

[0018] Figure 2a It is a side view of the support seat;

[0019] Figure 2b The structural diagram of the support seat;

[0020] Figure 3 is a schematic diagram of a positioning grid fixture;

[0021] Figure 4 Schematic diagram of the pipe holder fixture;

[0022] In the figure: 1. Support seat; 2. Lower pipe seat fixture; 3. Positioning grid fixture; 4. Flip control box; 5. Upper pipe seat fixture;

[0023] 101. Positioning tube cover plate; 102. Hexagonal head bolt; 103. Ejector rod; 104. Base; 105. Positioning tube flange; 106. Hexagon socket countersunk screw; 107. Positioning tube;

[0024] 301. Clamp body; 302. Support block; 303. Press block; 304. Movable crossbeam; 305. Movable press block; 306. Movable column; 307. Pressing handle; 308. Locking handle;

[0025] 201. Pipe socket clamp body; 202. Pipe socket support block; 203. Pipe socket pressure block; 204. Pipe socket movable crossbeam; 205. Pipe socket movable pressure block; 206. Pipe socket movable column; 207. Pipe socket clamping handle; 208. Pipe socket locking handle. DETAILED DESCRIPTION

[0026] The present invention will be further described below through the accompanying drawings and specific implementation methods.

[0027] like Figure 1 As shown, the platform is composed of a support base 1 installed on the operating platform, a lower pipe base fixture 2, a positioning grid fixture 3, an upper pipe base fixture 5 and a flip control box 4.

[0028] The support seat 1 is fixedly installed on the operating platform, corresponding to the installation direction of the fuel assembly structural parts to be assembled. The lower tube seat clamp 2 and the upper tube seat clamp 5 have the same structure and are both fixed on the operating platform. The positioning grid clamp 3 is also fixed on the operating platform.

[0029] The operating platform is a conventional transmission mechanism for driving the fuel assembly structure. A conventional flip control box 4 is installed on the operating platform to provide power for the transmission mechanism. The flip control box 4 can use a transmission combination of a servo motor and a lead screw to provide power for the rod bundle to slide.

[0030] like Figure 2a and Figure 2b As shown, the support base 1 includes a vertical base 104 , a positioning cylinder 107 and a positioning cylinder flange 105 .

[0031] An oblique keyway in a 45° direction is machined on the top of the base 104, and the outer end of the slot is a through hole with a smaller diameter. A positioning sleeve flange 105 is installed in the oblique keyway, and the positioning sleeve flange 105 can move in the oblique keyway.

[0032] A horizontal positioning cylinder 107 is installed through the positioning cylinder flange 105 , a positioning cylinder cover plate 101 is installed at the end of the positioning cylinder flange 105 , and the positioning cylinder cover plate 101 and the positioning cylinder flange 105 are fixed by hexagonal bolts 102 .

[0033] When the hexagonal bolt 102 is pushed, the positioning tube flange 105 is driven to move in the above-mentioned oblique key groove, and the moving direction is oblique 45°.

[0034] A push rod 103 is installed in the through hole at the outer end of the inclined key slot at an angle of 45° above the support seat 1, and the lower end of the push rod 103 is positioned with the positioning tube flange 105 through a groove, thereby positioning the positioning tube 107.

[0035] The upper end of the push rod 103 is locked and fixed by a nut.

[0036] The positioning tube flange 105 and the positioning tube 107 are fixed by means of hexagon socket countersunk screws 106 .

[0037] In this embodiment, the hexagon socket countersunk screws 106 are evenly distributed in the circumferential direction, and three of them may be used.

[0038] The positioning cylinder 107 is used to receive the fuel rods and lower tube seats to be assembled brought by the mechanical transmission belt of the operating platform.

[0039] Tightening the hexagonal bolt 102 can drive the positioning tube 107 to move, thereby driving the lower pipe seat and the rod bundle to move along a fixed direction.

[0040] A spring is installed between the base 104 and the positioning tube flange 105, and the elastic force of the spring is used to ensure the stability and flexibility of the connection of the positioning tube.

[0041] The lower tube seat and rod bundle can slide out of the clamp at 45 degrees. The sliding distance (5mm) should ensure that the positioning tube can fit the lower tube seat well.

[0042] Of course, the above-mentioned sliding angle, i.e. the tilting angle, refers to the angle between the inclined groove direction and the horizontal direction, which can be selected within 30 to 60 degrees, as long as the sliding direction does not contact the fixture and does not damage the component structure.

[0043] like Figure 3 The side view of the spacer grid fixture 3 shown (from Figure 1 The positioning grid fixture 3 includes a clamp body 301, a support block 302, a pressing block 303, a movable cross beam 304, a movable pressing block 305 and a movable column 306.

[0044] The cross section of the clamp body 301 is L-shaped and is fixedly mounted on the operating platform. The front end of the clamp body 301 ( Figure 3 The movable column 306 in the vertical direction is fixedly installed on the right side of the clamp body 301, and the movable crossbeam 304 in the horizontal direction is fixedly installed above the clamp body 301 and the movable column 306. The cross section of the clamp body 301, the movable crossbeam 304 and the movable column 306 is square when viewed from the side.

[0045] A vertical support block 302 and a pressing block 303 are fixedly installed on the inner side of a part in the vertical direction of the clamp body 301 , and a horizontal support block 302 and a pressing block 303 are fixedly installed on the inner side of a part in the horizontal direction.

[0046] A movable pressing block 305 in the vertical direction is fixedly installed on the inner side of the movable column 306 .

[0047] A movable pressing block 305 in the horizontal direction is fixedly installed on the inner side of the movable cross beam 304 .

[0048] Since the L-shaped clamp body 301 is fixed, all the pressing blocks 303 inside the clamp body 301 are also fixed.

[0049] The ends of the movable upright column 306 and the movable cross beam 304 are fixedly connected via a locking handle 308 .

[0050] The movable crossbeam 304 and the movable column 306 are both equipped with clamping handles 307, which are connected to the movable pressing blocks 305 on the inner sides of the movable crossbeam 304 and the movable column 306. The clamping handles 307 are rotated to adjust the positions of the movable pressing blocks 305 so that all the pressing blocks 303 and the movable pressing blocks 305 are clamped and fixed to the grid frame together.

[0051] Since the rod bundle spacer grid has a raised rigid support, grooves are specifically processed on the pressing block 303 and the movable pressing block 305 to protect their rigid support for the spacer grid.

[0052] In order to enable the rod bundle to move away from the fixture in a direction of 45 degrees, the groove sides of the pressing block 303 and the movable pressing block 305 are chamfered to ensure that the rigid support can also slide out of the pressing block 303 when the rod bundle slides out of the fixture range.

[0053] like Figure 4 The structure of the upper tube seat clamp 5 or the lower tube seat clamp 2 is basically the same as the above-mentioned positioning grid clamp 3, including a tube seat clamp body 201, a tube seat support block 202, a tube seat pressing block 203, a tube seat movable cross beam 204, a tube seat movable pressing block 205 and a tube seat movable column 206. In order to facilitate connection and operation, a tube seat clamping handle 207 and a tube seat locking handle 208 are designed.

[0054] The connection structure is the same as the above-mentioned spacer grid clamp 3.

[0055] The difference is that the inner sides of the pressing block 303 and the movable pressing block 305 have groove structures, and the structural parts are not damaged when they are separated from them. The inner sides of the tube seat pressing block 203 and the tube seat movable pressing block 205 are smooth planes, which mainly play the role of supporting the tube seat.

Claims

1. A nuclear fuel rod bundle assembly platform, comprising a support base (1), an upper tube base fixture (5), a positioning grid fixture (3) and a lower tube base fixture (2) installed on an operating platform, characterized in that: The support seat (1) comprises a vertical base (104), a positioning tube (107) and a positioning tube flange (105); an oblique keyway is machined on the upper end of the base (104), a positioning tube flange (105) is installed in the oblique keyway, and the positioning tube flange (105) is fixed to the horizontal positioning tube (107); the positioning tube flange (105) can move in the oblique keyway; the clamping height of the support seat (1) is equal to the clamping height of the upper tube seat clamp (5), the positioning grid clamp (3) and the lower tube seat clamp (2); A through hole is processed at the outer end of the oblique keyway, a push rod (103) is arranged in the through hole, and the lower end of the push rod (103) is positioned with the positioning tube flange (105) through a groove; A spring is provided between the base (104) and the positioning cylinder flange (105).

2. A nuclear fuel rod bundle assembly platform as claimed in claim 1, characterized in that: The end of the positioning cylinder flange (105) is connected to the positioning cylinder cover plate (101), and the positioning cylinder cover plate (101) and the positioning cylinder flange (105) are fixed by means of hexagonal bolts (102).

3. A nuclear fuel rod bundle assembly platform as claimed in claim 1, characterized in that: The upper end of the push rod (103) is locked and fixed by a nut.

4. A nuclear fuel rod bundle assembly platform as claimed in claim 2, characterized in that: The positioning cylinder flange (105) and the positioning cylinder (107) are fixed by means of hexagon socket countersunk screws (106).

5. A nuclear fuel rod bundle assembly platform as claimed in claim 2, characterized in that: The inclination angle of the oblique keyway is 30 to 60 degrees.

6. A nuclear fuel rod bundle assembly platform as claimed in claim 1, characterized in that: The positioning grid clamp (3) comprises a clamp body (301), a support block (302), a pressure block (303), a movable crossbeam (304), a movable pressure block (305) and a movable column (306); the clamp body (301) has an L-shaped cross section, a movable column (306) in a vertical direction is fixedly provided at the front end of the clamp body (301), and a movable crossbeam (304) in a horizontal direction is fixedly provided above the clamp body (301) and the movable column (306); a support block (302) and a pressure block (303) in a vertical direction are fixedly provided on the inner side of the vertical part of the clamp body (301), and a support block (302) and a pressure block (303) in a horizontal direction are fixedly provided on the inner side of the horizontal part; a movable pressure block (305) in a vertical direction is fixedly provided on the inner side of the movable column (306), and a movable pressure block (305) in a horizontal direction is fixedly provided on the inner side of the movable crossbeam (304).

7. A nuclear fuel rod bundle assembly platform as claimed in claim 6, characterized in that: The clamping surfaces of the pressing block (303) and the movable pressing block (305) are processed with grooves for chamfering the side surfaces.

8. The nuclear fuel rod bundle assembly platform according to claim 1, characterized in that: The upper tube seat clamp (5) and the lower tube seat clamp (2) have the same structure, comprising a tube seat clamp body (201), a tube seat support block (202), a tube seat pressure block (203), a tube seat movable cross beam (204), a tube seat movable pressure block (205) and a tube seat movable column (206); the tube seat clamp body (201) has an L-shaped cross section, a vertical tube seat movable column (206) is fixedly provided at the front end of the tube seat clamp body (201), and the upper parts of the tube seat clamp body (201) and the tube seat movable column (206) are A pipe seat movable crossbeam (204) in the horizontal direction is fixedly provided; a pipe seat support block (202) and a pipe seat pressing block (203) in the vertical direction are fixedly provided on the inner side of the vertical direction portion of the pipe seat clamp body (201), and a pipe seat support block (202) and a pipe seat pressing block (203) in the horizontal direction are fixedly provided on the inner side of the horizontal direction portion; a pipe seat movable pressing block (205) in the vertical direction is fixedly provided on the inner side of the pipe seat movable column (206), and a pipe seat movable pressing block (205) in the horizontal direction is fixedly provided on the inner side of the pipe seat movable crossbeam (204).

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