Powder filling, pressing, welding and sealing device and process for powder filling type target element

Abstract

The invention particularly relates to a powder filling type target element powder filling and pressing welding sealing device. The powder filling type target element powder filling and pressing welding sealing device comprises a closed cabin, a fixed powder filling tool arranged in the closed cabin, a powder pressing tool, a welding gun fixing and supporting piece, a target element clamping and rotating tool, a welding gun and a transition bin connected with the closed cabin. The invention further relates to a powder filling type target element powder filling, powder pressing, welding and sealing process. According to the invention, the whole process of powder filling, compaction and welding sealing of the powder filling type target element is ensured to be under the inert gas protection atmosphere, and meanwhile, the filling amount of the target material powder is ensured and the target material powder is not polluted by air.

Description

Technical Field

[0001] The invention relates to the technical field of isotope irradiation production target element preparation, in particular to a powder filling, pressing, welding and sealing device and process for a powder filling type target element. Background Art

[0002] At present, the target elements at home and abroad are mainly ceramic pellet type, dispersion type and metal pellet type, and their fuel core or target material surface adsorption capacity is limited. Since the target material filled in the powder-filled target element is in powder form, its large specific surface area has a strong adsorption capacity. In order to avoid the pollution of the powdered target material by gases such as carbon dioxide contained in the air, during the production and manufacturing process of the powder-filled target element, it is necessary to ensure that the target element powder filling, compaction, welding and sealing processes are carried out under an inert gas protective atmosphere, and at the same time, it is necessary to ensure the powder filling amount of the target element and that it is not polluted by the air.

[0003] Therefore, it is necessary to design a set of powder filling, powder pressing, welding and sealing devices for powder-filled components, and to match the corresponding preparation process to ensure that the powder filling, compacting and welding sealing of the powder-filled target components are carried out under an inert gas protective atmosphere throughout the process, while ensuring the filling amount of the target powder and not being contaminated by the air. Summary of the invention

[0004] The purpose of the present invention is to provide a powder filling, powder pressing, welding and sealing device and process for powder-filled components, so as to ensure that the powder filling, compacting and welding sealing of the powder-filled target components are carried out under an inert gas protective atmosphere, while ensuring the filling amount of the target material powder and preventing it from being polluted by air.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A powder-filled target element powder filling, pressing, welding and sealing device comprises a closed cabin, a fixed powder filling tool placed in the closed cabin, a powder compacting tool, a welding gun fixed support, a target element clamping and rotating tool and a welding gun, and a transition chamber connected to the closed cabin;

[0007] The fixed powder loading tool is used to fix the target element cladding in it and load the target material powder; the powder compacting tool is used to fix the target element cladding in it and compact the target material powder; the welding gun fixed support is used to adjust the welding gun to align with the required welding position and maintain the required gap; the target element clamping and rotating tool is used to clamp the target element and rotate the target element with different parameters according to different rotation parameter requirements; the welding gun is used to weld the target element with different parameters according to different welding parameter requirements; the transition chamber is used to adjust the inert gas protective atmosphere in the closed cabin; the closed cabin is used to provide an inert gas protective atmosphere.

[0008] As one possible implementation, the welding gun is an arc welding gun.

[0009] As one possible implementation method, an arc welding gun is provided with a high-frequency arc starting element.

[0010] As one of the feasible ways, the welding gun is connected to the closed chamber through an extension interface, and the extension interface is sealed by resin.

[0011] The present invention provides a powder-filled target element powder filling, pressing, welding and sealing process, comprising the following steps:

[0012] Step 1: transfer the target element cladding, the upper end plug, the sealed target material powder and the upper gasket into the closed cabin through the transition chamber;

[0013] Step 2, fixing the target element shell in the powder fixing tool and unpacking and filling the target material powder into the target element shell;

[0014] Step 3, fixing the target element cladding filled with target material powder and compacting the target material powder in a powder compacting tool;

[0015] Step 4, step 2 and step 3 are repeated several times to ensure the loading amount of target powder;

[0016] Step 5, installing a gasket and an upper end plug at the end of the target element cladding to form a target element;

[0017] Step 6: Clamp the target element in the target element clamping and rotating fixture, and adjust and position the welding gun in the welding gun fixing support so as to align with the desired welding position and maintain the desired gap;

[0018] Step 7: Start the welding gun to weld and seal the target element. During the welding and sealing process of the target element, the target element is rotated by the target element clamping and rotating tooling.

[0019] As one achievable manner, the target element cladding in step 1 is a target element cladding with a welded and sealed lower end plug.

[0020] As one achievable method, in step 2, the target powder is loaded manually or automatically using an automatic loading mechanism.

[0021] As one achievable manner, in step 3, the target material powder is compacted manually using a pressing rod or automatically using an automatic compacting mechanism.

[0022] As one of the feasible ways, before step 1, the airtight chamber is purged to replace the air in the airtight chamber with an inert gas.

[0023] As one feasible method, in step 1, the target element cladding, the upper end plug, the sealed target material powder and the upper gasket are transferred into a closed cabin through a transition chamber after gas washing; the air in the transition chamber is replaced with an inert gas after gas washing.

[0024] Beneficial technical effects of the present invention:

[0025] The powder filling, pressing, welding and sealing device and process of the powder-filled element of the present invention adopt inert gas atmosphere protection, thereby ensuring that the powder filling, pressing and welding sealing of the powder-filled target element are all carried out under the inert gas protection atmosphere; a modular functional combination is adopted, and the applicability is strong, and the preparation of powder-filled target elements with different specifications and filling requirements can be achieved by adjusting the inert gas atmosphere and the powder filling, pressing and welding sealing processes; the versatility is strong, and the operation process is easy to control, which is conducive to the industrial production of powder-filled target elements; the problem that the target material powder of the powder-filled target element has strong adsorption force and is easily polluted by air, and it is difficult to ensure the purity of the nuclides produced by irradiation is effectively solved, and high-quality preparation of the powder-filled target element is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of an embodiment of a powder-filled target element of the present invention;

[0027] Figure 2 The present invention is a schematic structural view of an embodiment of a powder filling, pressing, welding and sealing device for a powder filled component.

[0028] In the figure, 1. upper end plug; 2. upper gasket; 3. target material powder; 4. gap; 5. fixed powder loading tooling; 6. powder compacting tooling; 7. welding gun fixed support; 8. target element clamping and rotating tooling; 9. welding gun; 10. transition chamber; 11. closed cabin. DETAILED DESCRIPTION

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0030] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "inside", "outside", "upper", "lower", "outer side", "inner side", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] refer to Figure 1 , shows a schematic structural diagram of a powder-filled target element of the present invention, wherein the powder-filled target element comprises a target element shell, target material powder 3 filled in the target element shell, an upper end plug 1 welded and sealed at the upper end of the target element shell, and a lower end plug welded and sealed at the lower end of the target element shell; the upper end plug 1 is separated from the target material powder 3 by an upper gasket 2, and an upper gap 4 exists between the upper gasket 2 and the upper end plug 1; the lower end plug is separated from the target material powder 3 by a lower gasket, and a lower gap exists between the lower gasket and the lower end plug.

[0034] refer to Figure 2 , showing a schematic structural diagram of a powder-filled target element powder-filling, powder-pressing, welding and sealing device of the present invention, the powder-filled target element powder-filling, powder-pressing, welding and sealing device comprising a closed cabin 11, a fixed powder-filling tool 5 placed in the closed cabin 11, a powder-pressing tool 6, a welding gun fixed support 7, a target element clamping and rotating tool 8 and a welding gun 9, and a transition chamber 10 connected to the closed cabin 11;

[0035] The fixed powder loading tool 5 is used to fix the target element shell in it and load the target powder 3; the powder compacting tool 6 is used to fix the target element shell in it and compact the target powder 3; the welding gun fixing support 7 is used to adjust and position the welding gun 9 to align with the required welding position and maintain the required gap; the target element clamping and rotating tool 8 is used to clamp the target element and rotate the target element with different parameters according to different rotation parameter requirements; the welding gun 9 is used to weld the target element with different parameters according to different welding parameter requirements; the transition chamber 10 is used for the circulation of the inert gas protective atmosphere in the closed cabin 11, so as to realize the adjustment of the inert gas protective atmosphere in the closed cabin 11; the closed cabin 11 is used to provide an inert gas protective atmosphere.

[0036] The closed chamber 11 is the main body of the device, which provides an inert gas protective atmosphere, and the fixed powder loading tool 5, the powder compacting tool 6, the welding gun fixed support 7, the target element clamping and rotating tool 8 and the welding gun 9 are placed therein. The fixed powder loading tool 5 fixes the target element shell in it and loads the target material powder 3. The powder compacting tool 6 fixes the target element shell in it and compacts the target material powder 3. The loading and compacting process of the target material powder 3 is repeated many times to ensure the total loading amount of the target material powder 3.

[0037] In the present invention, as one of the feasible ways, in order to ensure that the target element is welded and sealed in an inert gas protective atmosphere, the welding gun 9 uses an arc welding gun with a relatively simple and convenient welding output.

[0038] In the present invention, as one of the feasible ways, the inert gas protective atmosphere in the closed chamber 11 is high-purity helium. It is difficult to start an arc with an arc welding gun. The arc welding gun used is equipped with a high-frequency arc starting component to ensure that the arc welding gun can start an arc.

[0039] In the present invention, as one of the feasible ways, the welding gun 9 is connected to the closed cabin 11 through an extension interface, and the extension interface is sealed by resin.

[0040] The present invention provides a powder-filled target element powder filling, pressing, welding and sealing process, comprising the following steps:

[0041] Step 1, transfer the target element cladding, the upper end plug 1, the sealed target powder 3 and the upper gasket 2 into the closed cabin 11 through the transition chamber 10;

[0042] Step 2, fixing the target element shell in the powder fixing tool 5 and unpacking and filling the target material powder 3 into the target element shell;

[0043] Step 3, fixing the target element cladding filled with target material powder 3 and compacting the target material powder 3 in the powder compacting tool 6;

[0044] Step 4, step 2 and step 3 are repeated multiple times to ensure the loading amount of target powder 3;

[0045] Step 5, installing the upper gasket 2 and the upper end plug 1 at the end of the target element cladding to form the target element;

[0046] Step 6: clamp the target element in the target element clamping and rotating fixture 8, and adjust and position the welding gun 9 in the welding gun fixing support 7 so as to align with the required welding position and maintain the required gap;

[0047] Step 7, start the welding gun 9 to weld and seal the target element. During the welding and sealing process of the target element, the target element is rotated by the target element clamping and rotating tool 8.

[0048] In the present invention, as one achievable manner, the target element cladding in step 1 is a target element cladding to which a lower end plug has been welded and sealed.

[0049] In the present invention, as one achievable method, in step 2, the target powder 3 is loaded manually or automatically by using an automatic loading mechanism.

[0050] In the present invention, as one achievable manner, in step 3, the target powder 3 is compacted manually using a pressing rod or automatically compacted using an automatic compacting mechanism.

[0051] In the present invention, as one of the achievable methods, before step 1, the closed chamber 11 is purged to replace the air in the closed chamber 11 with an inert gas.

[0052] In the present invention, as one of the feasible methods, in step 1, the target element cladding, the upper end plug 1, the sealed target material powder 3 and the upper gasket 2 are transferred into the closed cabin 11 through the transition chamber 10 after gas washing; the air in the transition chamber 10 is replaced with an inert gas after gas washing.

[0053] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0054] Example 1

[0055] This embodiment provides a powder-filled target element powder filling, pressing, welding and sealing process, using the above-mentioned powder-filled target element powder filling, pressing, welding and sealing device, including the following steps:

[0056] Step 1, transfer the target element cladding, the upper end plug 1, the sealed target powder 3 and the upper gasket 2 into the closed cabin 11 through the transition chamber 10;

[0057] Step 2, fixing the target element shell in the powder fixing tool 5 and unpacking and filling the target material powder 3 into the target element shell;

[0058] Step 3, fixing the target element cladding and compacting the target material powder 3 in the powder compacting tool 6;

[0059] Step 4, step 2 and step 3 are repeated multiple times to ensure the loading amount of target powder 3;

[0060] Step 5, installing the upper gasket 2 and the upper end plug 1 at the end of the target element cladding to form the target element;

[0061] Step 6: clamp the target element in the target element clamping and rotating fixture 8, and adjust and position the welding gun 9 in the welding gun fixing support 7 so as to align with the required welding position and maintain the required gap;

[0062] Step 7, start the welding gun 9 to weld and seal the target element. During the welding and sealing process of the target element, the target element is rotated by the target element clamping and rotating tool 8.

[0063] In this embodiment, as one of the feasible ways, the powder-filled target element is a C-14 target box, and the target powder is AlN powder.

[0064] In this embodiment, as one of the feasible ways, before step 1, the closed cabin 11 is scrubbed to replace the air in the closed cabin 11 with an inert gas to ensure that the oxygen and water contents in the closed cabin 11 are both below 1 μg / g.

[0065] In this embodiment, as one of the feasible methods, in step 1, the target element shell is a target element shell with a welded sealed lower end plug; the target element shell, the upper end plug 1, the sealed packaged target material powder 3 and the upper gasket 2 are transferred into the closed cabin 11 through the transition chamber 10 after three gas washings; the gas washing process of the transition chamber 10 is: the transition chamber 10 is evacuated to below 10Pa, and then filled with inert gas.

[0066] In this embodiment, as one of the feasible ways, in step 2, the target powder 3 is loaded manually.

[0067] In this embodiment, as one of the achievable ways, in step 3, the target material powder 3 is compacted manually using a pressing rod.

[0068] In this embodiment, as one of the feasible ways, in step 4, step 2 and step 3 are repeated (6 to 8) times to ensure the loading amount of target powder 3, and the loading amount of target powder 3 is 13.2 g.

[0069] In this embodiment, as one of the feasible methods, in step 5, the welding parameters of the target element are: welding current (22-24) A, welding speed 50 deg / s, pulse frequency 100 Hz, tungsten electrode diameter (1.0-1.6) mm, shielding gas flow rate (10-15) L / min, welding time 9 s, cooling time (15-30) s.

[0070] Through the powder filling, pressing, welding and sealing device process of the powder-filled target element of this embodiment, the powder filling, pressing and welding sealing of the C-14 target box are realized. After appearance, X-ray, water corrosion, steam corrosion, metallographic, blasting and helium leak detection inspections, the effective penetration depth of the C-14 target box weld is (0.36~0.41) mm, all inspection indicators are qualified, and the C-14 target box welding qualification rate is above (90~100)%, which meets the requirements of C-14 target box production.

[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A powder-filled target element powder filling, pressing, welding and sealing device, characterized in that: The invention comprises a sealed chamber (11), a fixed powder loading tool (5) placed in the sealed chamber (11), a powder compacting tool (6), a welding gun fixing support (7), a target element clamping and rotating tool (8) and a welding gun (9), and a transition chamber (10) connected to the sealed chamber (11); the fixed powder loading tool (5) is used to fix the target element shell in the sealed chamber and load the target material powder (3); the powder compacting tool (6) is used to fix the target element shell in the sealed chamber and compact the target material powder (3); The invention relates to a welding gun fixing support (7) for adjusting and positioning the welding gun (9) to align with a desired welding position and maintain a desired gap; the target element clamping and rotating tool (8) for clamping the target element and rotating the target element with different parameters according to different rotation parameter requirements; the welding gun (9) for welding the target element with different parameters according to different welding parameter requirements; the transition chamber (10) for adjusting the inert gas protective atmosphere in the closed cabin (11); and the closed cabin (11) for providing the inert gas protective atmosphere.

2. The powder-filled target element powder filling, pressing, welding and sealing device according to claim 1, characterized in that: The welding gun (9) is an arc welding gun.

3. The powder-filled target element powder filling, pressing, welding and sealing device according to claim 2, characterized in that: Arc welding gun with high frequency arc starting element.

4. The powder-filled target element powder filling, pressing, welding and sealing device according to claim 2, characterized in that: The welding gun (9) is connected to the sealed chamber (11) through an expansion interface, and the expansion interface is sealed by resin.

5. A powder-filled target element powder filling, pressing, welding and sealing process, characterized in that: The steps include: Step 1: Transfer the target element cladding, the upper end plug (1), the sealed target material powder (3) and the upper gasket (2) into a sealed cabin (11) through a transition chamber (10); Step 2, fixing the target element shell in the powder fixing tool (5) and unpacking and filling the target material powder (3) into the target element shell; Step 3, fixing the target element cladding filled with the target material powder (3) and compacting the target material powder (3) in the powder compacting tool (6); Step 4, step 2 and step 3 are repeated multiple times to ensure the loading amount of the target powder (3); Step 5: Installing a gasket (2) and an upper end plug (1) at the end of the target element cladding to form a target element; Step 6: clamping the target element in the target element clamping rotating tool (8), adjusting and positioning the welding gun (9) in the welding gun fixing support (7) to align with the desired welding position and maintain the desired gap; Step 7: Start the welding gun (9) to weld and seal the target element. During the welding and sealing process of the target element, the target element is rotated by the target element clamping and rotating tool (8).

6. The powder-filled target element powder filling, pressing, welding and sealing process according to claim 5, characterized in that: The target element cladding in step 1 is a target element cladding to which a lower end plug has been welded and sealed.

7. The powder-filled target element powder filling, pressing, welding and sealing process according to claim 5, characterized in that: In step 2, the target powder (3) is loaded manually or automatically using an automatic loading mechanism.

8. The powder-filled target element powder filling, pressing, welding and sealing process according to claim 5, characterized in that: In step 3, the target material powder (3) is compacted manually using a pressing rod or automatically compacted using an automatic compacting mechanism.

9. The powder-filled target element powder filling, pressing, welding and sealing process according to claim 7, characterized in that: Before step 1, the airtight chamber (11) is purged to replace the air in the airtight chamber (11) with an inert gas.

10. The powder-filled target element powder filling, pressing, welding and sealing process according to claim 7, characterized in that: In step 1, the target element cladding, the upper end plug (1), the sealed target material powder (3) and the upper gasket (2) are transferred into the closed cabin (11) through the transition cabin 10 after gas washing; the air in the transition cabin 10 is replaced with an inert gas after gas washing.

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