Lower nozzle assembly tool for pressurized water reactor fuel assembly

Abstract

The application relates to a lower tube support assembly tool for a pressurized water reactor fuel assembly, which comprises a positioning seat (3), tube support positioning frames (1) and guide plates (4) installed on opposite sides of the positioning seat (3), and a tube support positioning plate (2) slidably installed on the positioning seat (3) between the tube support positioning frames (1) and the guide plates (4); the tube support positioning frame (1) is detachably connected with the tube support positioning plate (2), and the tube support positioning plate (2) is detachably connected with the positioning seat (3); the lower tube support of the pressurized water reactor fuel assembly is positioned in the tube support positioning frame (1); the lower tube support of the pressurized water reactor fuel assembly is positioned on the tube support positioning plate (2) in a plane abutting mode; and the guide plates (4) are used for guiding the pressurized water reactor fuel rods. The lower tube support assembly tool for the pressurized water reactor fuel assembly is easy to install, does not affect the pressurized water reactor fuel assembly, and improves the assembly quality of the pressurized water reactor fuel assembly.

Description

Technical Field

[0001] This invention relates to the field of pressurized water reactor fuel assembly technology, and in particular to a tooling for assembling the lower tube seat of a pressurized water reactor fuel assembly. Background Technology

[0002] The existing assembly fixture for the lower tube seat of pressurized water reactor fuel assemblies requires operators to install the lower tube seat on the positioning seat, then move it to the assembly platform, and finally push it towards the frame to assemble the lower tube seat with the locking bolts of the frame guide tube. The installation process is complex; the lower tube seat and positioning fixture are quite heavy, and moving them to the platform as a whole poses a certain safety risk. Assembling the frame guide tube with the lower tube seat requires high precision and necessitates manual adjustment. The entire process is labor-intensive and poses safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide a tooling for assembling the lower tube of a pressurized water reactor fuel assembly. This tooling is easy and convenient to install, and will not affect the pressurized water reactor fuel assembly, thereby improving the assembly quality of the pressurized water reactor fuel assembly.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A pressurized water reactor (PWR) fuel assembly lower tube holder assembly fixture includes a positioning seat, a tube holder positioning frame and a guide plate mounted on opposite sides of the positioning seat, and a tube holder positioning plate slidably mounted on the positioning seat between the tube holder positioning frame and the guide plate. The tube holder positioning frame and the tube holder positioning plate are detachably connected, and the tube holder positioning plate is detachably connected to the positioning seat. The tube holder positioning frame matches the lower tube holder of the PWR fuel assembly, and the lower tube holder of the PWR fuel assembly is fitted within the positioning frame to achieve positioning of the lower tube holder. The tube holder positioning plate matches the lower plane of the lower tube holder of the PWR fuel assembly, and the lower plane of the lower tube holder is fitted and positioned on the tube holder positioning plate. The guide plate is designed according to the position of the PWR fuel assembly rods and is used to guide the PWR fuel rods.

[0006] Working principle: Position the tube seat positioning plate on the positioning seat; open the tube seat positioning frame and position the lower tube seat with the skeleton on the tube seat positioning frame; bring the lower tube seat close to the tube seat positioning plate so that the lower surface of the lower tube seat is close to the tube seat positioning plate; remove the lower tube seat from the skeleton, open the tube seat positioning frame, and remove the lower tube seat together with the tube seat positioning plate; after assembling the fuel rods into the skeleton, install the lower tube seat together with the tube seat positioning plate onto the positioning seat; push the upper tube seat assembly fixture to move towards the guide tube to complete the assembly of the lower tube seat and the guide tube.

[0007] Furthermore, the tube seat positioning frame is provided with a vertical reference block and a horizontal reference block. The tube seat positioning frame is positioned within the tube seat positioning frame through the gap fit between the vertical reference block and the horizontal reference block.

[0008] Preferably, the tube seat positioning plate is snap-fitted onto the positioning seat.

[0009] Furthermore, the guide plate is detachably mounted on the positioning seat.

[0010] Preferably, the guide plate is snapped onto the positioning seat.

[0011] Furthermore, the pressurized water reactor fuel assembly lower tube seat is positioned on the tube seat positioning plate by means of irregular bolts and positioning blocks.

[0012] Furthermore, the tube seat positioning plate is connected to the motor; after the pressurized water reactor fuel assembly is assembled, the motor drives the tube seat positioning plate to flip until the pressurized water reactor fuel assembly is upright.

[0013] Furthermore, a pulley is installed at the bottom of the positioning seat.

[0014] Beneficial technical effects of the present invention:

[0015] The pressurized water reactor fuel assembly lower tube seat assembly tooling of the present invention makes the installation process easy and convenient, and does not affect the pressurized water reactor fuel assembly, thereby improving the assembly quality of the pressurized water reactor fuel assembly. Attached Figure Description

[0016] Figure 1 This is a rear view of the assembly fixture for the lower tube seat of the pressurized water reactor fuel assembly according to the present invention.

[0017] Figure 2 This is a front view of the assembly fixture for the lower tube of the pressurized water reactor fuel assembly according to the present invention;

[0018] Figure 3 This is a schematic diagram of the assembly tooling structure for the lower tube seat of the pressurized water reactor fuel assembly according to the present invention;

[0019] Figure 4 This is a perspective view of the assembly fixture for the lower tube seat of the pressurized water reactor fuel assembly of the present invention.

[0020] In the figure, 1-pipe seat positioning frame; 2-pipe seat positioning plate; 3-positioning seat; 4-guide plate. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] See Figure 1-4 This invention provides a fixture for assembling the lower tube seat of a pressurized water reactor (PWR) fuel assembly, comprising a positioning seat 3, a tube seat positioning frame 1 and a guide plate 4 mounted on opposite sides of the positioning seat 3, and a tube seat positioning plate 2 slidably mounted on the positioning seat 3 between the tube seat positioning frame 1 and the guide plate 4; the tube seat positioning frame 1 and the tube seat positioning plate 2 are detachably connected, and the tube seat positioning plate 2 and the positioning seat 3 are detachably connected; the tube seat positioning frame 1 matches the lower tube seat of the PWR fuel assembly, and the lower tube seat of the PWR fuel assembly is fitted within the tube seat positioning frame 1 with a clearance to achieve positioning of the lower tube seat of the PWR fuel assembly; the tube seat positioning plate 2 matches the lower plane of the lower tube seat of the PWR fuel assembly, and the lower tube seat of the PWR fuel assembly is positioned against the tube seat positioning plate 2; the guide plate 4 is designed according to the position of the PWR fuel assembly rods and is used to guide the PWR fuel rods.

[0023] Furthermore, the tube seat positioning frame 1 is provided with a vertical reference block and a horizontal reference block. The tube seat positioning frame is positioned within the tube seat positioning frame 1 through the gap fit between the vertical reference block and the horizontal reference block.

[0024] Preferably, the tube seat positioning plate 2 is snap-fitted onto the positioning seat 3.

[0025] Furthermore, the guide plate 4 is detachably mounted on the positioning seat 3.

[0026] Preferably, the guide plate 4 is snapped onto the positioning seat 3.

[0027] Furthermore, the pressurized water reactor fuel assembly lower tube seat is positioned on the tube seat positioning plate 2 by means of irregular bolts and positioning blocks.

[0028] Furthermore, the tube seat positioning plate 2 is connected to the motor; after the pressurized water reactor fuel assembly is assembled, the motor drives the tube seat positioning plate 2 to flip until the pressurized water reactor fuel assembly is upright.

[0029] The assembly tooling for the pressurized water reactor fuel assembly lower tube of the present invention includes the following steps:

[0030] 1. Position and install the pipe seat positioning plate 2 on the positioning seat 3;

[0031] 2. Open the tube seat positioning frame 1 and position the lower tube seat with the skeleton on the tube seat positioning frame 1;

[0032] 3. Place the lower tube seat close to the tube seat positioning plate 2, and use irregular bolts and positioning blocks to press the lower surface of the lower tube seat tightly against the tube seat positioning plate 2;

[0033] 4. Remove the lower tube seat from the frame, open the tube seat positioning frame 1, and remove the lower tube seat together with the tube seat positioning plate 2.

[0034] 5. After assembling the fuel rods into the frame, install the lower tube seat together with the tube seat positioning plate 2 onto the positioning seat 3;

[0035] 6. Move the upper tube seat assembly tool toward the guide tube to complete the assembly of the lower tube seat and the guide tube.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A tooling for assembling the lower tube seat of a pressurized water reactor fuel assembly, characterized in that, The system includes a positioning seat (3), a tube seat positioning frame (1) and a guide plate (4) installed on opposite sides of the positioning seat (3), and a tube seat positioning plate (2) slidably installed on the positioning seat (3) between the tube seat positioning frame (1) and the guide plate (4); the tube seat positioning frame (1) and the tube seat positioning plate (2) are detachably connected, and the tube seat positioning plate (2) and the positioning seat (3) are detachably connected; the tube seat positioning frame (1) matches the lower tube seat of the pressurized water reactor fuel assembly, and the lower tube seat of the pressurized water reactor fuel assembly is fitted within the tube seat positioning frame (1) to achieve positioning of the lower tube seat of the pressurized water reactor fuel assembly; the tube seat positioning plate (2) matches the lower plane of the lower tube seat of the pressurized water reactor fuel assembly, and the lower plane of the lower tube seat of the pressurized water reactor fuel assembly is fitted and positioned on the tube seat positioning plate (2); the guide plate (4) is designed according to the position of the pressurized water reactor fuel assembly rods and is used to guide the pressurized water reactor fuel rods.

2. The pressurized water reactor fuel assembly lower tube mounting fixture according to claim 1, characterized in that, The tube seat positioning frame (1) is provided with a vertical reference block and a horizontal reference block. The tube seat positioning frame is positioned within the tube seat positioning frame (1) through the gap fit between the vertical reference block and the horizontal reference block.

3. The pressurized water reactor fuel assembly lower tube mounting fixture according to claim 1, characterized in that, The tube seat positioning plate (2) is snapped onto the positioning seat (3).

4. The pressurized water reactor fuel assembly lower tube mounting fixture according to claim 1, characterized in that, The guide plate (4) is detachably mounted on the positioning seat (3).

5. The pressurized water reactor fuel assembly lower tube mounting fixture according to claim 4, characterized in that, The guide plate (4) is snapped onto the positioning seat (3).

6. The pressurized water reactor fuel assembly lower tube mounting fixture according to claim 1, characterized in that, The pressurized water reactor fuel assembly lower tube seat is positioned on the tube seat positioning plate (2) by using irregular bolts and positioning blocks.

7. The pressurized water reactor fuel assembly lower tube mounting fixture according to claim 1, characterized in that, The tube seat positioning plate (2) is connected to the motor; after the pressurized water reactor fuel assembly is assembled, the motor drives the tube seat positioning plate (2) to flip until the pressurized water reactor fuel assembly is upright.

8. The pressurized water reactor fuel assembly lower tube mounting fixture according to any one of claims 1-7, characterized in that, The bottom of the positioning seat (3) is equipped with pulleys.

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