Outer casing welding device

Abstract

The utility model discloses an outer casing welding device which comprises a base and a cover cap movably matched with the base, and the cover cap and the base are sealed and covered through a starting assembly. A welding machine and a bracket assembly are arranged on the base in a matched mode, the bracket assembly is perpendicular to a machine head of the welding machine, a tungsten electrode in the machine head is used for welding an outer wrapping shell placed on the bracket assembly, a jacking assembly is arranged on the side, away from the machine head, of the bracket assembly, and the outer wrapping shell on the bracket assembly is pushed into the machine head to be welded. After the outer cladding pipe is placed, the cover is closed, then the sealing cavity in the cover is vacuumized and then filled with helium, meanwhile, the welding machine is filled with helium with proper pressure to balance the internal and external pressure of the fuel rod cladding pipe, the interior and the exterior of the cladding pipe are both placed in the helium environment, the reliability of helium protection in the welding process can be guaranteed, and the welding quality of the fuel rod cladding pipe is improved. And later helium leak detection can be facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear technology application-sealed radioactive source production, and specifically relates to an outer shell welding device. Background Art

[0002] In the production of industrial radioactive sources, welding and sealing are the core technologies. The device designed in this patent is used to weld and seal the outer shell of the radioactive source with a highly radioactive core. In order to realize the subsequent helium mass spectrometer leak detection process, helium needs to be filled into the shell. In terms of product quality and safety of use, in order to meet the requirements of national standards and relevant regulations, the quality of the weld of the shell is extremely high in terms of weld formation appearance, internal structural defects, weld strength, etc. At the same time, due to the hazards of strong radiation, the welding of the shell must be carried out in a specific shielded hot room and remotely controlled outside the hot room.

[0003] At present, similar welding processes in China use multiple devices to achieve vacuuming, helium addition, top plug, welding and other process operations. The defects of existing processes and devices are: in terms of production process, the operation is complicated and the production efficiency is low; in terms of welding, it is difficult to obtain a large penetration depth and high-quality welds using TIG argon local protection welding; in terms of helium addition reliability, the existing process is to transfer the cladding after helium addition to the welding device for open welding, and there is a risk of helium leakage in this process, which reduces the reliability of helium maintenance. Utility Model Content

[0004] In order to make up for the shortcomings of the prior art, the utility model provides a cladding automatic welding device which integrates exhaust, helium addition, weld tightening, overall gas protection and welding functions. It can obtain high-quality welds, ensure the reliability of helium addition welding, realize the automation of the entire welding process and greatly improve the work efficiency.

[0005] The outer shell welding device includes a base and a cover that movably cooperates with the base, and the cover is sealed with the base through a starting assembly; a welding machine and a bracket assembly are arranged on the base, and the bracket assembly is perpendicular to the head of the welding machine. The tungsten electrode in the head welds the outer shell placed on the bracket assembly, and a jacking assembly is arranged on the side of the bracket assembly away from the head to push the outer shell on the bracket assembly into the head for welding. Through the specific design and combination of the above components, the function of the specific welding requirements of the outer shell is realized.

[0006] Furthermore, the welding machine includes a machine head and a machine body, the machine head includes a machine head main body and an arc-shaped opening piece, one end of the arc-shaped opening piece is hingedly cooperated with the machine head main body, and the other end is cooperated with the machine head main body through a locking assembly; a welding port is arranged on the machine head main body, and the welding part of the outer shell enters the machine head main body through the welding port for welding, thereby realizing precise positioning and placement of the outer shell and the weld.

[0007] Furthermore, the base is provided with a positive electrode interface of the welding machine, a negative electrode interface of the welding machine, a vacuum aviation plug of the welding machine control line, a vacuum aviation plug of the peripheral control, a vacuum tube interface, a water inlet pipe joint, a water outlet pipe joint and a helium gas pipe joint. The positive electrode interface of the welding machine, the negative electrode interface of the welding machine, the vacuum aviation plug of the welding machine control line, the vacuum aviation plug of the peripheral control, the water inlet pipe joint, the water outlet pipe joint and the helium gas pipe joint are connected to the pipe opening provided at one end of the machine body away from the main body of the machine head after the wiring harness is assembled; the vacuum tube interface is equipped with a vacuum pumping device at the bottom of the base. The design of the above-mentioned characteristic structure meets the interface requirements and sealing requirements of the device for water, electricity and gas.

[0008] Furthermore, the bracket assembly includes at least two brackets arranged at intervals, a V-shaped groove is arranged on the top of the bracket, and the outer shell is clamped in the V-shaped groove to achieve the outer shell axis positioning function.

[0009] Furthermore, the jacking assembly includes a jacking motor, and a push rod is arranged on the output shaft of the jacking motor. The push rod abuts against the end of the outer shell, meeting the process requirement that the weld needs to be in close contact during the welding process of the outer shell.

[0010] Furthermore, the jacking motor is fixed to the base through an L-shaped bracket, and a fixed block is arranged on the side of the L-shaped bracket close to the bracket assembly, and a limit plate is arranged on the fixed block. The limit plate is movably abutted against the output shaft of the jacking motor to limit the stroke of the output shaft to realize the axial positioning function of the outer shell.

[0011] Furthermore, the starting assembly includes two symmetrically arranged groups, which include a cylinder and a pressure plate. The cylinder is respectively arranged on both sides of the base, and the pressure plate is respectively arranged on both sides of the upper end surface of the cover. The driving shaft of the cylinder is fixedly connected to the pressure plate on the corresponding side to realize the upper and lower opening and closing and reliable sealing of the cover.

[0012] Furthermore, a filling piece is arranged on the base to reduce the free space in the cover.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] (1) The design of integrated technology of exhaust, helium addition, overall gas protection, automatic welding joint tightening and automatic welding greatly reduces labor intensity, ensures the reliability of helium, and greatly improves production efficiency.

[0015] (2) The cover structure is adopted, and the overall environment space of the cladding welding obtains gas protection without dead corners. Compared with the existing open local gas protection, the welding protection is more sufficient and the welding quality is reliably guaranteed.

[0016] (3) The shell structure design allows helium to be added to the outer shell while using helium as the welding shielding gas. Helium has a high ionization potential and high thermal conductivity. Compared with argon arc welding, it is easier to obtain high penetration welds to meet the corresponding technical requirements.

[0017] (4) After the outer cladding tube is placed, the cover is closed, and then the sealed cavity in the cover is evacuated and then filled with helium. At the same time, the welding machine is also filled with helium of appropriate pressure to balance the internal and external pressures of the fuel rod cladding tube, so that the inside and outside of the cladding tube are placed in a helium environment, which not only ensures the reliability of helium protection during the welding process, but also facilitates the subsequent helium leak detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a bottom structure diagram of the utility model;

[0020] Figure 3 This is one of the structural schematic diagrams of the utility model (excluding the cover and the filler);

[0021] Figure 4 This is the second structural schematic diagram of the utility model (excluding the cover and the filling piece).

[0022] In the figure: 10-base, 11-welding machine positive electrode interface, 12-welding machine negative electrode interface, 13-welding machine control line vacuum aviation plug, 14-peripheral control vacuum aviation plug, 15-vacuum tube interface, 16-water inlet pipe joint, 17-water outlet pipe joint, 18-helium gas pipe joint, 19-fixed axis, 20-welding machine, 21-machine head, 211-machine head body, 212-arc opening piece, 213-welding port, 214-pipe port, 22-machine body, 23-locking assembly, 30-starting assembly, 31-cylinder, 32-pressing plate, 40-bracket assembly, 41-bracket, 50-jacking assembly, 51-jacking motor, 52-push rod, 53-L-shaped bracket, 60-outer shell, 70-fixing block, 71-limiting plate, 80-filling piece, 90-cover. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the present invention is further described below in conjunction with the accompanying drawings.

[0024] like Figure 1-Figure 2As shown, an outer shell welding device includes a base 10 and a cover 90 that is movably matched with the base 10, and the cover 90 is sealed and covered with the base 10 through a starting assembly 30; a welding machine 20 and a bracket assembly 40 are arranged on the base 10, and the bracket assembly 40 is perpendicular to the head 21 of the welding machine 20, and the tungsten electrode in the head 21 welds the outer shell 60 placed on the bracket assembly 40, and a jacking assembly 50 is arranged on the side of the bracket assembly 40 away from the head 21, and the outer shell 60 on the bracket assembly 40 is pushed into the head 21 for welding. Among them, the starting assembly 30 includes two symmetrically arranged groups, which include a cylinder 31 and a pressure plate 32, the cylinder 31 is respectively arranged on both sides of the base 10, and the pressure plate 32 is respectively arranged on both sides of the upper end surface of the cover 90, and the driving shaft of the cylinder 31 is fixedly connected to the pressure plate 32 on the corresponding side.

[0025] Specifically, the welding machine 20 includes a machine head 21 and a machine body 22. The machine head 21 includes a machine head body 211 and an arc-shaped opening piece 212. One end of the arc-shaped opening piece 211 is hingedly matched with the machine head body 211, and the other end is matched with the machine head body 211 through a locking assembly 23. A welding port 213 is provided on the machine head body 211, and the welding part of the outer shell 60 enters the machine head body 211 through the welding port 213 for welding. The principle of the machine head 21 and the locking assembly 23 of this application is the same as that of a machine head of a sealed pipe-to-pipe welding machine disclosed in Chinese patent CN214978780U, and will not be described in detail here. Figure 3 and Figure 4 As shown, a welding machine positive electrode interface 11, a welding machine negative electrode interface 12, a welding machine control line vacuum aviation plug 13, a peripheral control vacuum aviation plug 14, a vacuum tube interface 15, a water inlet pipe joint 16, a water outlet pipe joint 17 and a helium gas pipe joint 18 are provided on the base 10. The welding machine positive electrode interface 11, the welding machine negative electrode interface 12, the welding machine control line vacuum aviation plug 13, the peripheral control vacuum aviation plug 14, the water inlet pipe joint 16, the water outlet pipe joint 17 and the helium gas pipe joint 18 are assembled with wiring harnesses and connected to the pipe opening 214 provided at one end of the machine body 22 away from the machine head main body 211; the vacuum tube interface 15 is equipped with a vacuum pumping device at the bottom of the base 10.

[0026] It can be understood that the tungsten motor in the welding machine 20 is used to weld the end of the outer shell 60 inserted into the welding port 213. During the welding process, helium is filled into the welding chamber of the welding machine 20 for protection. At the same time, cooling water circulation is connected through the water inlet pipe joint 16 and the water outlet pipe joint 17 to further ensure the welding quality.

[0027] Continuing to refer to the accompanying drawings, it can be seen that the bracket assembly 40 includes at least two spaced-apart brackets 41 , a V-shaped groove is provided on the top of the bracket 41 , and the outer shell 60 is clamped in the V-shaped groove to facilitate the positioning of the outer shell 60 and prevent the outer shell 60 from sliding off the bracket 41 .

[0028] In order to be more automated, after the manipulator places the outer shell 60 on the bracket 41, the jacking assembly 50 is set to push the outer shell 60 into the welding port 213 of the welding machine 20. The jacking assembly 50 includes a jacking motor 51, and a push rod 52 is set on the output shaft of the jacking motor 51, and the push rod 52 abuts against the end of the outer shell 60. The jacking motor 51 is fixed to the base 10 through an L-shaped bracket 53, and a fixed block 70 is set on the side of the L-shaped bracket 53 close to the bracket assembly 40, and a limit plate 71 is set on the fixed block 70, and the limit plate 71 is movably abutted against the output shaft of the jacking motor 51 to limit the stroke of the output shaft, so as to prevent the outer shell 60 from being pushed too deep or insufficiently into the welding port 213, resulting in an incorrect position of the welding of the end of the outer shell 60, affecting the welding quality.

[0029] In addition, in order to reduce the space in the cover 90, reduce the volume of the gas, and accelerate the extraction of oxygen and the filling of helium in the cover 90, the present application also sets a filler 80 on the base 10. In a specific embodiment, the filler 80 is preferably a wooden block, which is fixed to the base 10 by a fixing shaft 19.

[0030] The specific operation process during use is as follows: (1) the manipulator places the outer shell 60 on the bracket 41, starts the jacking assembly 50, and the jacking motor 51 pushes the outer shell 60 into the welding port 213 of the welding machine 20; (2) the starting assembly 30 drives the cover 90 to close, so that the entire welding is carried out in a sealed environment; (3) the vacuuming device connected through the vacuum tube interface 15 evacuates the inside of the cover 90 and then flushes helium; (4) the welding machine 20 is started for welding, and after welding, the cover 90 is opened to take out the outer shell 60. This operation can place the inside and outside of the cladding tube in a helium environment, which can not only ensure the reliability of helium protection during the welding process, but also facilitate the helium leak detection in the later stage.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An outer shell welding device, characterized in that: The invention comprises a base (10) and a cover (90) movably matched with the base (10), wherein the cover (90) is sealed and covered with the base (10) through a starting assembly (30); a welding machine (20) and a bracket assembly (40) are arranged on the base (10); the bracket assembly (40) is perpendicular to a head (21) of the welding machine (20); a tungsten electrode in the head (21) welds an outer shell (60) placed on the bracket assembly (40); and a jacking assembly (50) is arranged on a side of the bracket assembly (40) away from the head (21) to push the outer shell (60) on the bracket assembly (40) into the head (21) for welding.

2. The outer shell welding device according to claim 1, characterized in that: The welding machine (20) comprises a machine head (21) and a machine body (22); the machine head (21) comprises a machine head main body (211) and an arc-shaped opening piece (212); one end of the arc-shaped opening piece (212) is hingedly matched with the machine head main body (211), and the other end is matched with the machine head main body (211) through a locking assembly (23); a welding opening (213) is provided on the machine head main body (211), and the welding portion of the outer shell (60) enters the machine head main body (211) through the welding opening (213), so as to realize accurate positioning and placement of the outer shell and the weld.

3. The outer shell welding device according to claim 2, characterized in that: The base (10) is provided with a welding machine positive electrode interface (11), a welding machine negative electrode interface (12), a welding machine control line vacuum aviation plug (13), a peripheral control vacuum aviation plug (14), a vacuum tube interface (15), a water inlet pipe joint (16), a water outlet pipe joint (17) and a helium gas pipe joint (18); the welding machine positive electrode interface (11), the welding machine negative electrode interface (12), the welding machine control line vacuum aviation plug (13), the peripheral control vacuum aviation plug (14), the water inlet pipe joint (16), the water outlet pipe joint (17) and the helium gas pipe joint (18) are assembled with a wiring harness and connected to a pipe opening (214) arranged at one end of the machine body (22) away from the machine head main body (211); the vacuum tube interface (15) is equipped with a vacuum pumping device at the bottom of the base (10).

4. The outer shell welding device according to claim 1, characterized in that: The bracket assembly (40) comprises at least two brackets (41) arranged at intervals, a V-shaped groove is provided on the top of the bracket (41), and the outer shell (60) is clamped in the V-shaped groove to achieve the outer shell axis positioning function.

5. The outer shell welding device according to claim 1, characterized in that: The jacking assembly (50) comprises a jacking motor (51), and a push rod (52) is arranged on the output shaft of the jacking motor (51), and the push rod (52) abuts against the end of the outer casing (60).

6. The outer shell welding device according to claim 5, characterized in that: The jacking motor (51) is fixed to the base (10) via an L-shaped bracket (53), and a fixing block (70) is provided on one side of the L-shaped bracket (53) close to the bracket assembly (40), and a limiting plate (71) is provided on the fixing block (70), and the limiting plate (71) is movably abutted against the output shaft of the jacking motor (51) to limit the stroke of the output shaft.

7. An outer shell welding device according to any one of claims 1 to 6, characterized in that The starting assembly (30) includes two symmetrically arranged groups, which include a cylinder (31) and a pressure plate (32). The cylinder (31) is respectively arranged on both sides of the base (10), and the pressure plate (32) is respectively arranged on both sides of the upper end surface of the cover (90). The driving shaft of the cylinder (31) is fixedly connected to the pressure plate (32) on the corresponding side.

8. An outer shell welding device according to any one of claims 1 to 6, characterized in that: A filling piece (80) is also provided on the base (10).

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