Irradiation fuel assembly lower tube base assembling and welding clamp

Abstract

The utility model belongs to the technical field of nuclear fuel assemblies, and particularly relates to an irradiation fuel assembly lower pipe base assembling and welding clamp. Comprising a positioning bottom plate, a positioning connecting rod, a pressing plate, a tightening nut and a test plate positioning frame, the positioning connecting rod is connected to the middle of the positioning bottom plate, the head of the positioning connecting rod is sleeved with the pressing plate, the pressing plate is fixed through cooperation of the tightening nut and the positioning connecting rod, and a plurality of holes are formed in the positioning bottom plate. A first frame plate positioning pin and a second frame plate positioning pin penetrate through the holes, and a test plate positioning frame is fixed on the positioning bottom plate. The device has the beneficial effects that the frame plate and the connecting plate can be quickly positioned through the frame plate positioning pin and the positioning connecting rod, so that one-time assembly of parts is realized, and the product positioning precision is ensured. The fixture is made of soft and hard combined corrosion-resistant non-magnetic metal material titanium alloy, so that the durability and portability of the fixture are fully ensured. The clamp has been successfully applied to the product manufacturing of the lower tube seat of the irradiation fuel material assembly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to nuclear fuel assembly technical field, concretely relates to a kind of irradiation fuel assembly lower tube base assembly welding fixture. BACKGROUND

[0002] Irradiation fuel assembly lower tube base, by 1 block frame plate 1, 1 block connecting plate 2 Assembly welding (as shown in Figure 1 And 2 There are the following problems.

[0003] 1) frame plate 1 and connecting plate 2 after two parts relative position precision requirement is higher, need to control welding deformation, realize workpiece one-time assembly welding.

[0004] 2) lower tube base product structure features, when fixture design, the fixed position of sample on fixture and the positioning position of product on fixture have interference, cannot realize the characteristics that positioning datum plate of sample and product share on same positioning base plate, fixture design needs to consider compatibility. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of irradiation fuel assembly lower tube base assembly welding fixture, can realize lower tube base one-time assembly welding, solve the positioning position interference problem of sample and product on fixture, to reduce the error of multiple replacement fixture and multiple assembly on same equipment, effectively control welding deformation, improve product welding quality and efficiency.

[0006] The technical scheme of the utility model is as follows: a kind of irradiation fuel assembly lower tube base assembly welding fixture, including positioning base plate, positioning connecting rod, compression plate, tightening nut and test plate positioning frame, the positioning base plate is connected with positioning connecting rod in the middle, the head of positioning connecting rod is equipped with compression plate, and compression plate is fixed by the cooperation of tightening nut and positioning connecting rod, multiple holes are opened on positioning base plate, first frame plate positioning pin and second frame plate positioning pin are passed in hole, and test plate positioning frame is fixed on positioning base plate.

[0007] The positioning base plate, positioning connecting rod, compression plate and sample positioning frame material are selected titanium alloy of corrosion-resistant non-magnetic metal material of soft and hard combination.

[0008] The positioning base plate is square structure, and the four corners are chamfered to form smooth transition.

[0009] The positioning connecting rod is 4.

[0010] The four positioning connecting rods are arranged in center symmetry relative to the center of positioning plate.

[0011] The positioning base plate is provided with multiple jackscrews.

[0012] The test plate positioning frame has a long groove, a threaded through hole at one end of the long groove, and positioning countersunk holes at both ends.

[0013] The advantages of this invention are as follows: The frame plate and connecting plate can be quickly positioned using the frame plate positioning pins and positioning connecting rods, enabling one-time assembly of parts and ensuring product positioning accuracy. An independent, detachable test plate positioning frame is designed to achieve compatibility within the same fixture, ensuring that the assembled sample meets process requirements. The fixture is made of a corrosion-resistant, non-magnetic titanium alloy, a combination of hard and soft materials, fully guaranteeing its durability and lightweight nature. This fixture has been successfully applied to the manufacturing of a lower tube seat for an irradiated fuel assembly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the lower tube seat assembly;

[0015] Figure 2 A sectional view of the lower tube seat assembly;

[0016] Figure 3 A schematic diagram of a welding fixture for assembling the lower tube seat of an irradiated fuel assembly provided by this utility model;

[0017] Figure 4 for Figure 3 Sectional view along axis AA;

[0018] Figure 5 This is a schematic diagram of the assembly of the test plate positioning frame;

[0019] Figure 6 This is a schematic diagram of the test plate positioning frame.

[0020] In the diagram: 1. Frame plate, 2. Connecting plate, 3. Weld, 4. Positioning base plate, 5. Positioning connecting rod, 6. Pressing plate, 7. Positioning pin of the first frame plate, 8. Tightening nut, 9. Positioning pin of the second frame plate, 10. Tightening screw, 11. Test plate positioning frame. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 3 and 4 As shown, a welding fixture for assembling the lower tube seat of an irradiated fuel assembly includes a positioning base plate 4, a positioning connecting rod 5, a clamping plate 6, a frame plate positioning pin, a tightening nut 8, and a test plate positioning frame 11. The fixture uses rigid positioning to limit the workpiece's thermal deformation. The positioning base plate 4, positioning connecting rod 5, clamping plate 6, and test plate positioning frame 11 are made of a corrosion-resistant, non-magnetic titanium alloy, a combination of hard and soft materials, ensuring the fixture's durability.

[0023] The positioning base plate 4 is a square structure, four corners of which are formed with smooth transitions, and four positioning connecting rods 5 are connected to the middle of the positioning base plate 4, the four positioning connecting rods 5 are arranged in a central symmetry relative to the center of the positioning plate, and the head of the four positioning connecting rods 5 is sleeved with a pressing plate 6, and the pressing plate 6 is fixed through the threaded cooperation of a tightening nut 8 and the positioning connecting rod 5.

[0024] The positioning base plate 4 is also provided with a plurality of jacking screws 10, and the positioning base plate 4 is mainly used for clamp support and positioning assembly.

[0025] The fixed position of the test plate positioning frame 11 on the clamp interferes with the positioning position of the product on the clamp, if a test plate assembly hole is directly opened on the positioning base plate 4, the connecting hole on the positioning connecting rod 5 on the base plate 4 will be damaged, therefore, a separate detachable test plate positioning frame 11 is designed for the clamp to realize compatibility of the same clamp.

[0026] A threaded hole is formed in one side end of the long slot of the test plate positioning frame 11.

[0027] The positioning base plate 4 and the first frame plate positioning pin 7 are used to fix the frame plate 1 through the positioning pin holes in the two diagonal positions of the frame plate 1, so as to limit the displacement in two directions of the horizontal plane, the guide tube hole in the connecting plate 2 is used, and the connecting plate 2 is limited in the transverse and axial directions through the four positioning connecting rods 5 connected with the clamp base plate 4, and finally the longitudinal Z direction is tightened through the one pressing plate 6 and the four tightening nuts 8, so that the lower pipe base can be assembled at one time through simple operation, the welding seam is welded, and higher assembly precision is maintained.

[0028] The fixed position of the test plate on the clamp interferes with the positioning position of the product on the clamp, if a groove is directly opened on the positioning plate for test sample assembly, the position is just overlapped with the positioning pin hole, and the test sample groove cannot be directly realized on the positioning plate, in order to consider compatibility, the positioning hole is avoided, the test sample frame plate is added, and multifunctional use of the clamp is realized.

[0029] The use process of the utility model is as follows:

[0030] Lower pipe base assembly welding:

[0031] Two first frame plate positioning pins 7 and four positioning connecting rods 5 are assembled and fixed on the positioning base plate 4. The clamp is cleaned, the frame plate 1 is first placed in the clamp, then the connecting plate 2 is passed through the four positioning connecting rods 5, the pressing plate 6 is passed through the connecting rod 5 and covered on the connecting plate 2, and the four tightening nuts 8 are respectively passed through the positioning connecting rods 5 and tightened. After welding is completed, the nuts 8 are loosened, the nuts 8 and the pressing plate 6 are removed, and the lower pipe seat welding part is taken out.

[0032] Sample assembly and welding:

[0033] When the sample is welded, the two first frame plate positioning pins 7 and the four positioning connecting rods 5 are not needed to be installed. The test plate positioning frame 11 is installed at the corresponding position of the positioning base plate 4. The test plate is inserted into the opening slot of the test plate positioning frame 11, and the test plate is tightly clamped with the fixing screw. After the test plate is welded, the fixing screw is loosened, and the test plate is removed.

Claims

1. An irradiated fuel assembly lower nozzle assembly welding fixture, characterized by: It comprises a positioning base plate, positioning connecting rods, a pressing plate, a tightening nut and a test plate positioning frame, the positioning base plate is connected with the positioning connecting rods in the middle, the head of the positioning connecting rods is sleeved with the pressing plate, the pressing plate is fixed by the cooperation of the positioning connecting rods and the tightening nut, a plurality of holes are opened on the positioning base plate, the first frame plate positioning pin and the second frame plate positioning pin are penetrated in the holes, and the test plate positioning frame is fixed on the positioning base plate.

2. An irradiated fuel assembly lower nozzle assembly welding fixture as set forth in Claim 1, characterized by: The positioning base plate, the positioning connecting rods, the pressing plate and the test plate positioning frame are made of a soft and hard combined corrosion-resistant non-magnetic metal material titanium alloy.

3. An irradiated fuel assembly lower nozzle assembly welding fixture as set forth in Claim 1 wherein: The positioning base plate is in a square structure, and the four corners are chamfered to form smooth transitions.

4. An irradiated fuel assembly lower nozzle assembly welding fixture as set forth in Claim 1 wherein: The positioning connecting rods are four.

5. An irradiated fuel assembly lower nozzle assembly welding fixture as set forth in Claim 4 wherein: The four positioning connecting rods are arranged in a central symmetry relative to the center of the positioning plate.

6. An irradiated fuel assembly lower nozzle assembly welding fixture as set forth in Claim 1 wherein: The positioning base plate is provided with a plurality of tightening screws.

7. An irradiated fuel assembly lower nozzle assembly welding fixture as set forth in Claim 1 wherein: A long slot is opened on the test plate positioning frame, a threaded hole is opened at one side end of the long slot, and positioning counterbores are opened at both ends.

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