Novel air blowing pipe connecting device for boron-aluminum grillwork laser welding

Abstract

The utility model discloses a novel blowpipe connecting device for boron-aluminum grillwork laser welding, which comprises an upper square connecting structure and a bottom cylindrical structure which are integrally formed, the top of the upper square connecting structure is fixedly connected with a laser emitting device, and the bottom of the bottom cylindrical structure is fixedly connected with a gun head tail end pipe. The laser emitting device, the upper square block connecting structure, the bottom cylindrical structure and the gun head tail end pipe are located on the same axis and internally communicated, two first threaded holes are formed in each of the four edges of the upper square block connecting structure, and red light positioning assemblies are installed in the first threaded holes. A second threaded hole and a third threaded hole are formed in the side wall of the bottom cylindrical structure, the second threaded hole and the third threaded hole are communicated with an inner hole of the bottom cylindrical structure, the second threaded hole is used for being connected with a compressed air pipeline, and the third threaded hole is used for being connected with an argon pipeline.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power related tools, in particular to a novel blowing pipe connecting device for boron aluminum grid laser welding. Background Art

[0002] In the kilowatt-class pressurized water reactor (PWR) nuclear power technology developed in recent years, spent fuel storage grids are used to store irradiated fuel assemblies removed from the core, spent fuel assemblies whose burnup has not reached specified limits, and new fuel assemblies to be loaded into the core before and during refueling. They play a vital role in improving the safety and reliability of nuclear power plant reactor systems.

[0003] The HWF40-1750 laser welding system (hereinafter referred to as the system) is used to weld the spent fuel storage grid storage casing tubes (hereinafter referred to as square tubes) to the connecting blocks. The system's welding gun head has an inbuilt blowpipe connection device consisting of a cylindrical portion and a frustum. The cylindrical portion is long and can collide with adjacent square tubes during welding, preventing proper welding.

[0004] Therefore, it is necessary to develop a new blow pipe connection device for boron aluminum grid laser welding. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a novel blowing pipe connecting device for laser welding of boron-aluminum grids.

[0006] In order to solve the technical problem, the technical solution of the utility model is: a new type of air blowing pipe connecting device for boron aluminum grid laser welding, consisting of an integrally formed upper square connecting structure and a bottom cylindrical structure, the top of the upper square connecting structure is fixedly connected to the laser emitting device, and the bottom of the bottom cylindrical structure is fixedly connected to the end tube of the gun head, the laser emitting device, the upper square connecting structure, the bottom cylindrical structure and the end tube of the gun head are on the same axis and are internally connected, two first threaded holes are respectively provided on the four sides of the upper square connecting structure, a red light positioning assembly is installed in the first threaded hole, a second threaded hole and a third threaded hole are provided on the side wall of the bottom cylindrical structure, the second threaded hole and the third threaded hole are respectively connected to the inner hole of the bottom cylindrical structure, the second threaded hole is used to connect the compressed air pipeline, and the third threaded hole is used to connect the argon gas pipeline.

[0007] Preferably, the upper block connection structure is a square structure, a circular groove is provided at the center of one end face of the square structure, the bottom center of the laser emitting device cooperates with the circular groove, a funnel-shaped through hole is provided at the bottom of the circular groove, and the funnel-shaped through hole is connected to the inner hole of the bottom cylindrical structure.

[0008] Preferably, through holes are respectively provided at the four corners of the end surface of the upper block connection structure, and screws pass through the through holes to be fixedly connected to the laser emitting device.

[0009] Preferably, two symmetrically positioned first threaded holes are respectively provided on the four sides of the upper block connecting structure, and the eight first threaded holes are in the same plane and perpendicular to the inner hole axis of the upper block connecting structure.

[0010] Preferably, the bottom cylindrical structure is a cylindrical structure, and the bottom of the bottom cylindrical structure is provided with an external thread, which is used to be threadedly connected to the end pipe of the gun head.

[0011] Preferably, the axial dimension of the upper block connection structure is 17 mm, the side length is 74 mm, the outer diameter of the bottom cylindrical structure is 20 mm, and the axial dimension is L-17 mm, where L is the defocus amount.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] (1) The utility model discloses a new type of air blow pipe connection device for laser welding of boron-aluminum grids, which changes the appearance of the air blow pipe connection device. The new type of air blow pipe connection device is composed of an upper block connection structure and a bottom cylindrical structure that are integrally formed. At the same time, the axial dimension of the upper block connection structure is reduced, and the axial dimension of the bottom cylindrical structure is increased, which effectively avoids the air blow pipe connection device from colliding with adjacent square tubes during the welding process, thereby improving the welding efficiency.

[0014] (2) Two first threaded holes are respectively provided on the four sides of the upper block connection structure of the utility model. Red light positioning components are installed in the first threaded holes. The dimensions of the new air blowing pipe connection device and the square tube are monitored by the two red light positioning components on each side to ensure the verticality of the new air blowing pipe connection device and avoid collision with the square tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 , a schematic diagram of the main structure of a new type of blowing pipe connecting device for laser welding of boron-aluminum grids of the utility model;

[0016] Figure 2 , a schematic top view of the structure of a new type of blowing pipe connecting device for laser welding of boron-aluminum grids in the utility model;

[0017] Figure 3 , a schematic cross-sectional view of a novel blowpipe connection device for laser welding of boron-aluminum grids according to the present invention;

[0018] Figure 4 , a schematic diagram of the use of an existing self-contained air blowing pipe connection device;

[0019] Figure 5 , A comparison diagram of the use of a new blowpipe connection device for laser welding of boron-aluminum grids and a built-in blowpipe connection device;

[0020] Figure 6 , A comparison diagram of the use of a new type of air blow pipe connecting device for laser welding of boron aluminum grids in the utility model and a built-in air blow pipe connecting device.

[0021] Description of reference numerals:

[0022] 1. Upper block connection structure, bottom cylindrical structure, 3. Laser emission device, 4. Gun end tube, 5. Self-contained air blow pipe connection device;

[0023] 1-1, first threaded hole, 1-2, circular groove, 1-3, funnel-shaped through hole, 1-4, through hole;

[0024] 2-1, second threaded hole, 2-2, third threaded hole, 2-3, external thread. DETAILED DESCRIPTION

[0025] The following describes the specific implementation of the present invention in conjunction with the embodiments:

[0026] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose that can be achieved by the present utility model.

[0027] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0028] In order to ensure the welding quality of spent fuel storage grid products, square tubes and connecting blocks are welded using a laser welding system. Therefore, it is necessary to design a new air blow pipe connection device for use with the laser welding system.

[0029] Example 1

[0030] like Figures 1-3As shown, the utility model discloses a new type of air blowing pipe connecting device for boron aluminum grid laser welding, which consists of an integrally formed upper block connecting structure 1 and a bottom cylindrical structure 2, the top of the upper block connecting structure 1 is fixedly connected to the laser emitting device 3, and the bottom of the bottom cylindrical structure 2 is fixedly connected to the gun head end tube 4, the laser emitting device 3, the upper block connecting structure 1, the bottom cylindrical structure 2 and the gun head end tube 4 are on the same axis and are internally connected, and two first threaded holes 1-1 are respectively provided on the four sides of the upper block connecting structure 1, and a red light positioning component is installed in the first threaded hole 1-1, and a second threaded hole 2-1 and a third threaded hole 2-2 are provided on the side wall of the bottom cylindrical structure 2, and the second threaded hole 2-1 and the third threaded hole 2-2 are respectively connected to the inner hole of the bottom cylindrical structure 2, and the second threaded hole 2-1 is used to connect a compressed air pipeline, and the third threaded hole 2-2 is used to connect an argon pipeline.

[0031] Example 2

[0032] like Figure 2 As shown, the upper block connection structure 1 is a square structure, and a circular groove 1-2 is provided at the center of one end face of the square structure. The bottom center of the laser emitting device 3 cooperates with the circular groove 1-2, and a funnel-shaped through hole 1-3 is provided at the bottom of the circular groove 1-2. The funnel-shaped through hole 1-3 is connected to the inner hole of the bottom cylindrical structure 2.

[0033] like Figure 2 As shown, through holes 1 - 4 are respectively provided at the four corners of the end surface of the upper block connection structure 1 , and screws pass through the through holes 1 - 4 to be fixedly connected to the laser emitting device 3 .

[0034] like Figure 1 、 2 As shown, two symmetrically positioned first threaded holes 1 - 1 are respectively provided on the four sides of the upper block connection structure 1 , and the eight first threaded holes 1 - 1 are in the same plane and perpendicular to the inner hole axis of the upper block connection structure 1 .

[0035] Example 3

[0036] like Figures 1-3 As shown, the bottom cylindrical structure 2 is a cylindrical structure, and the bottom of the bottom cylindrical structure 2 is provided with an external thread 2-3, which is used for threaded connection with the end tube 4 of the gun head.

[0037] The described new blowpipe connection device is machined from a single piece of material and is mainly divided into an upper square connection structure 1 and a bottom cylindrical structure 2. The first threaded hole 1-1 is machined with a thread according to a screw with a diameter of 3-5 mm commonly used in existing equipment; the second threaded hole 2-1 and the third threaded hole 2-2 are machined with a thread in the form of a quick connector for a blowpipe with an outer diameter of 10 mm; the threading depth of the external thread 2-3 is controlled at 25-30 mm and is connected to the end pipe 4 of the gun head.

[0038] Embodiment 4

[0039] Preferably, as Figure 1 、 3 shown, the axial dimension of the upper square connection structure 1 is 17 mm, the side length is 74 mm, the outer diameter of the bottom cylindrical structure 2 is 20 mm, and the axial dimension is L-17 mm, where L is the defocus amount.

[0040] The positional relationship between the welds of adjacent square pipes and the connection block in the prior art is as Figure 4 shown. In order to enable laser welding operations, the angle β between the incident laser and the weld should be 90°. When welding this product, the optimal defocus amount L from the laser emitter to the weld is a fixed value.

[0041] During welding, since the dimensions, positions of all square pipes and the size of the connection block are fixed values, and the defocus amount L and the angle β between the incident light beam and the weld are both fixed values. Therefore, the distance from the weld to the square pipe at the 3# position can be drawn using CAD lofting under a fixed defocus amount, and the gun head element at this position can be calculated inversely. After calculation, the measurement results of the existing laser welding system show that the blowpipe connection device is the closest to the 3# square pipe.

[0042] Finally, measure the maximum outer diameter D of the blowpipe connection device自带 in the laser welding system, and calculate and compare Figure 4 the size d and D / 2 in. The result shows that d < D / 2, indicating that the blowpipe connection device will collide with the 3# square pipe during welding.

[0043] As Figure 5 shown, a in the figure is a schematic diagram of the use of the blowpipe connection device自带, and b in the figure is a schematic diagram of the use of the new blowpipe connection device of the present invention. The present invention has redesigned the structure of the blowpipe connection device. The basic design principle is to ensure that the laser beam can pass through the device smoothly and does not collide with the 3# square pipe at the closest position during the welding process.

[0044] For this reason, we first determine the inner diameter of the device. Measure the inner diameter of the blowpipe connection device自带 in the laser welding system as the inner diameter of the self-made blowpipe connection device. The value range of the outer diameter A of the device is:

[0045] A < d - 1 Note: The perpendicularity of the square pipe is 1 mm, so 1 mm should be subtracted and rounded down.

[0046] like Figures 1-3 As shown, the utility model blowpipe connection device reduces the outer dimensions of the part that collides with the 3# square tube, effectively avoiding the collision with the 3# square tube during welding. Figures 1-3 Drill holes to ensure that the newly made blowpipe can be bolted together smoothly without affecting the welding quality and the normal operation of the equipment. Finally, simulate the practice on the test piece to ensure that the welding quality meets the technical requirements of the drawing.

[0047] The working principle of this utility model is as follows:

[0048] like Figures 1 to 6 As shown, the utility model discloses a new type of air blowing pipe connecting device for boron aluminum grid laser welding, which is connected to the laser emitting device 3 by screws above the device, and the second threaded hole 2-1 is connected to the compressed air pipeline to protect the lens of the laser emitting device 3 from dust. The third threaded hole 2-2 is connected to the argon pipeline, which can effectively protect the front of the weld during welding. The utility model changes the shape of the air blowing pipe connecting device, that is, it is composed of an integrally formed upper square connecting structure 1 and a bottom cylindrical structure 2. Two first threaded holes 1-1 are respectively provided on the four sides of the upper square connecting structure 1. A red light positioning component is installed in the first threaded hole 1-1, and the distance between it and the square tube can be detected by the red light positioning component. At the same time, the axial distance of the upper square connecting structure 1 is reduced, and the axial distance of the bottom cylindrical structure 2 is lengthened. Because the outer diameter of the bottom cylindrical structure 2 is cylindrical and is smaller than the side length of the upper square connecting structure 1, collision with the square tube is avoided, thereby ensuring the welding quality. Through verification on test pieces and the first batch of spent fuel storage grid products, the utility model can effectively solve the problem of collision between the original air blowpipe connection device and adjacent square tubes during the welding process.

[0049] like Figure 6 As shown in the figure, a is a schematic diagram of the use of the self-contained blowing pipe connecting device 5, and b is a schematic diagram of the use of the new blowing pipe connecting device of the utility model. After the laser emitting device 3, the blowing pipe connecting device, and the gun head end tube 4 are assembled, Figure 6 It can be clearly seen that the utility model changes the shape of the blowing pipe connection device, while reducing the thickness of the upper block connection structure 1 and increasing the length of the bottom cylindrical structure 2, effectively avoiding the collision between the upper block connection structure 1 and the square tube during the welding process.

[0050] The utility model discloses a new type of air blow pipe connecting device for laser welding of boron aluminum grids, which changes the appearance of the air blow pipe connecting device. The new air blow pipe connecting device consists of an integrally formed upper square block connecting structure and a bottom cylindrical structure. At the same time, the axial dimension of the upper square block connecting structure is reduced, and the axial dimension of the bottom cylindrical structure is increased, which effectively avoids the air blow pipe connecting device from colliding with adjacent square tubes during the welding process, thereby improving the welding efficiency.

[0051] Two first threaded holes are respectively provided on the four sides of the upper block connection structure of the utility model, and red light positioning components are installed in the first threaded holes. The two red light positioning components on each side are used to monitor the size of the new air blowing pipe connection device and the square tube, thereby ensuring the verticality of the new air blowing pipe connection device and avoiding collision with the square tube.

[0052] The connecting device of the utility model can realize smooth welding of the welding seams between the casing and the connecting block during the production process of the first batch of spent fuel storage grids, and has significantly improved the operation difficulty and production progress.

[0053] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

[0054] Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A new type of blowing pipe connection device for laser welding of boron-aluminum grid, characterized by: The invention comprises an upper block connecting structure (1) and a bottom cylindrical structure (2) which are integrally formed. The top of the upper block connecting structure (1) is fixedly connected to a laser emitting device (3), and the bottom of the bottom cylindrical structure (2) is fixedly connected to a gun head end tube (4). The laser emitting device (3), the upper block connecting structure (1), the bottom cylindrical structure (2) and the gun head end tube (4) are on the same axis and are internally connected. Two first threaded holes (1-1) are respectively provided on the four sides of the upper block connecting structure (1). A red light positioning component is installed in the first threaded hole (1-1). A second threaded hole (2-1) and a third threaded hole (2-2) are provided on the side wall of the bottom cylindrical structure (2). The second threaded hole (2-1) and the third threaded hole (2-2) are respectively connected to the inner hole of the bottom cylindrical structure (2). The second threaded hole (2-1) is used to connect a compressed air pipeline, and the third threaded hole (2-2) is used to connect an argon pipeline.

2. The novel blowpipe connection device for laser welding of boron-aluminum grid according to claim 1 is characterized in that: The upper block connection structure (1) is a square structure, a circular groove (1-2) is provided at the center of one end face of the square structure, the bottom center of the laser emitting device (3) matches the circular groove (1-2), a funnel-shaped through hole (1-3) is provided at the bottom of the circular groove (1-2), and the funnel-shaped through hole (1-3) is connected to the inner hole of the bottom cylindrical structure (2).

3. The novel blowpipe connection device for laser welding of boron-aluminum grid according to claim 1 is characterized in that: Through holes (1-4) are respectively provided at the four corners of the end surface of the upper block connection structure (1), and screws pass through the through holes (1-4) to be fixedly connected to the laser emitting device (3).

4. The novel blowpipe connection device for laser welding of boron-aluminum grid according to claim 1 is characterized in that: Two symmetrically positioned first threaded holes (1-1) are respectively provided on the four sides of the upper block connection structure (1); the eight first threaded holes (1-1) are located in the same plane and are perpendicular to the inner hole axis of the upper block connection structure (1).

5. The novel blowpipe connection device for laser welding of boron-aluminum grid according to claim 1 is characterized in that: The bottom cylindrical structure (2) is a cylindrical structure. The bottom of the bottom cylindrical structure (2) is provided with an external thread (2-3). The external thread (2-3) is used for threaded connection with the end tube (4) of the gun head.

6. The novel blowpipe connection device for laser welding of boron-aluminum grid according to claim 1, characterized in that: The upper block connection structure (1) has an axial dimension of 17 mm and a side length of 74 mm, and the bottom cylindrical structure (2) has an outer diameter of 20 mm and an axial dimension of L-17 mm, where L is the defocus amount.

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