Electron beam welding fixture for quick replacement of tube socket products

Abstract

The present invention provides an electron beam welding fixture capable of quickly replacing a tube socket product, comprising a base and a clamping plate, wherein a lower positioning diamond pin and an upper positioning member are connected to the base, wherein the lower positioning diamond pin is used to position a lower tube socket, and the upper positioning member is used to position an upper tube socket, and the clamping plate is a plate-shaped structure for clamping the lower tube socket or the upper tube socket. The electron beam welding fixture capable of quickly replacing a tube socket product provided by the present invention does not require frequent replacement of the welding fixture when welding different tube socket products, thereby simplifying the difficulty of operation when clamping and switching different tube socket products. It only requires quick disassembly and replacement of the lower positioning diamond pin or the upper positioning pin to realize welding production switching of different types of tube socket products, thereby improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear fuel component manufacturing, and in particular to an electron beam welding fixture capable of quickly replacing a tube seat product. Background Art

[0002] The upper tube seat and the lower tube seat are one of the key components of the FA300-3 nuclear fuel assembly. They have irreplaceable functions such as locating the core position of the fuel assembly, constraining the positioning skeleton, and filtering foreign matter in the primary circulation. In specific production scenarios, the particularity of the production requirements of some products requires that the upper and lower tube seats be welded sequentially on the same equipment, that is, 1 upper tube seat + 1 lower tube seat is a group. After welding 1 group of 2 different products, the next group of products can be welded. The welding sequence is to weld the two products alternately, and the welding fixture needs to be switched continuously.

[0003] In the prior art, technicians can only dismantle the existing welding fixture after welding one product and install and debug the welding fixture of another product. This not only takes a long time to install and debug, but also easily leads to the failure of the product due to the wrong installation of the fixture parts and the wrong fixture installation positioning base. It is not only time-consuming and labor-intensive, but also wastes a lot of time and money. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects described in the prior art, thereby providing an electron beam welding fixture that can quickly replace tube socket products. The electron beam welding fixture that can quickly replace tube socket products does not require frequent replacement of welding fixtures when welding different tube socket products, thereby simplifying the operational difficulty when clamping and switching different tube socket products. It only requires quick disassembly and replacement of the lower positioning diamond pin or the upper positioning pin to achieve welding production switching of different types of tube socket products, thereby improving production efficiency.

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

[0006] An electron beam welding fixture capable of quickly replacing a tube seat product comprises a base and a clamping plate, wherein the base is connected with a lower positioning diamond pin and an upper positioning piece, wherein the lower positioning diamond pin is used to position a lower tube seat, and the upper positioning piece is used to position an upper tube seat, and the clamping plate is a plate-shaped structure used to clamp the lower tube seat or the upper tube seat.

[0007] As an implementable manner, the upper positioning member is an upper positioning sleeve, and the upper positioning sleeve is detachably connected to the upper part of the lower positioning diamond pin.

[0008] As an implementable manner, the upper positioning member is an upper positioning pin, and the length of the upper positioning pin is greater than that of the lower positioning diamond pin.

[0009] As an implementable manner, four first step holes are provided on the base for positioning the upper positioning pins, and four second step holes are provided on the base for positioning the lower positioning diamond pins.

[0010] As an implementable manner, a weight-reducing hole is opened at the center of the base, a first threaded hole is opened on the side wall of the weight-reducing hole, and the first threaded hole leads to the first stepped hole.

[0011] As an implementable manner, a locking screw is provided in the first threaded hole for fixing the upper positioning pin.

[0012] As an implementable manner, six second threaded holes are further provided on the base, and the second threaded holes are connected to the electron beam welding equipment through screws.

[0013] As an implementable manner, a through hole is provided on the clamping plate, and the top of the lower positioning diamond pin or the top of the upper positioning pin passes through the through hole to achieve positioning and limiting.

[0014] As an implementable manner, the top of the lower positioning diamond pin or the top of the upper positioning pin is fixed by tightening a nut.

[0015] As an implementable manner, a spring washer is provided below the clamping plate, and the spring washer is sleeved on the lower positioning pin or the upper positioning pin.

[0016] Compared with the prior art, the electron beam welding fixture for quickly replacing a tube socket product provided by the present invention has the following beneficial effects:

[0017] The electron beam welding fixture for quickly replacing tube socket products provided by the present invention comprises a base and a clamping plate, wherein the base is connected with a lower positioning diamond pin and an upper positioning piece, and the lower positioning pin or the upper positioning piece is installed according to different tube socket products. There is no need to frequently replace the entire fixture during welding, and the lower positioning pin is used for welding the lower tube socket, and the upper positioning piece is used for welding the upper tube socket. The clamping plate is a plate-shaped structure that can well clamp the lower tube socket or the upper tube socket to improve welding quality and efficiency.

[0018] This electron beam welding fixture that can quickly replace tube socket products simplifies the operational difficulty when clamping and switching different products while effectively controlling welding deformation and improving welding quality. It only requires quick disassembly and replacement of different positioning parts to achieve welding production switching of different types of tube socket products, thereby improving production efficiency by more than 30%.

[0019] The use of the electron beam welding fixture capable of quickly replacing the tube socket product can ensure that after the electron beam welding of the tube socket is completed, the lateral shrinkage deformation of the weld is less than 0.15 mm, and the longitudinal shrinkage deformation of the weld is less than 0.30 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 An exploded view of a first implementation of an electron beam welding fixture capable of quickly replacing a tube socket product provided by an embodiment of the present invention;

[0022] Figure 2 A front view of a base provided by an embodiment of the present invention;

[0023] Figure 3 A back view of a base provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of an upper positioning pin provided in an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of the lower positioning diamond pin provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of the lower tube seat before clamping provided by an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of the structure of the lower tube seat after clamping provided by an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the structure of the upper tube seat before clamping provided by an embodiment of the present invention;

[0029] Fig. 9 A schematic diagram of the structure of the upper tube seat after clamping provided by an embodiment of the present invention;

[0030] Fig.10 A schematic diagram of assembling the lower tube seat provided in an embodiment of the present invention;

[0031] Fig.11 for Fig.10 A cross-sectional view of

[0032] Fig.12 A schematic diagram of assembling the upper tube seat provided in an embodiment of the present invention;

[0033] Fig.13 for Fig.12 A cross-sectional view of

[0034] Fig.14An exploded view of a second implementation of the electron beam welding fixture capable of quickly replacing a tube socket product provided in an embodiment of the present invention;

[0035] Fig.15 A schematic diagram of the structure of an upper positioning sleeve provided in an embodiment of the present invention;

[0036] Fig.16 This is a schematic diagram of installing an upper positioning sleeve when welding an upper pipe seat provided in an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Base; 2. Clamping plate; 3. Lower positioning diamond pin; 41. Upper positioning pin; 42. Upper positioning sleeve; 5. Lower tube seat; 6. Upper tube seat; 7. First step hole; 8. Second step hole; 9. Lightening hole; 10. First threaded hole; 11. Locking screw; 12. Second threaded hole; 13. Tightening nut; 14. Spring washer; 15. Long strip groove; 16. First limit rod; 17. Second limit rod; 18. Pin key; 19. Pin hole. DETAILED DESCRIPTION

[0039] Although the electron beam welding fixture for quickly replacing a tube socket product of the present invention can be implemented in a variety of different ways, the exemplary embodiments will be described in detail herein in conjunction with the accompanying drawings. It is understood that the description herein should be considered as an example of the structure of the electron beam welding fixture for quickly replacing a tube socket product, and is not intended to limit the protection scope of the present invention to the exemplary embodiments. Therefore, in essence, the drawings and the description of the specific embodiments should be considered to be used to illustrate rather than limit the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", "horizontal", "vertical" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] The following is further explained in detail through specific implementation methods.

[0042] like Figures 1 to 5As shown, the present invention provides an electron beam welding fixture for quickly replacing a tube seat product, comprising a base 1, a clamping plate 2, a lower positioning diamond pin 3 and an upper positioning pin 41. The base 1 is a square structure, and the lower positioning diamond pin 3 and the upper positioning pin 41 are detachably mounted on its front. The axial dimension of the lower positioning diamond pin 3 is smaller than the axial dimension of the upper positioning pin 41. The lower positioning diamond pin 3 is used to position the lower tube seat 5, and the upper positioning pin 41 is used to position the upper tube seat 6. Figures 6 to 9 As shown, the user selects the lower positioning diamond pin 3 and the upper positioning pin 41 according to the type of the tube socket product to be welded (i.e., the lower tube socket 5 and the upper tube socket 6). When the lower tube socket 5 needs to be welded, two lower positioning diamond pins 3 are installed on the second stepped hole 8 on the front side of the base 1, and the lower positioning diamond pins are locked by screwing in a standard screw on the back side of the base 1; then the base plate 1 is installed together with the lower positioning diamond pins 3 on the electron beam welding equipment, and the clamp is locked by screwing in the second threaded hole 12 with a standard screw; then, when the upper tube socket 6 needs to be welded, two upper positioning pins 41 are installed in the first stepped hole 7 on the front side of the base 1, and are locked by the locking screw 11; then, when the lower tube socket 5 is welded again, the locking screw 11 is loosened, the two upper positioning pins 41 are removed, but the two lower positioning diamond pins are kept stationary; when the upper tube socket 6 is welded again, two more upper positioning pins 41 are installed, and so on. Therefore, by providing an upper positioning pin 41 with a quick disassembly function, different pipe socket products can be quickly welded and continuous welding can be achieved by directly removing and disassembling the upper positioning pin 41 during welding, without the need to disassemble, install and debug the entire welding fixture.

[0043] like Figure 1 , Figures 6 to 9 As shown, the clamping plate 2 is a flat plate-shaped structure, and the clamping plate 2 is used to clamp the top of the lower tube seat 5 or the top of the upper tube seat 6. Preferably, the rectangular bottom surface of the clamping plate 2 is the same as the top surface of the lower tube seat 5 or the top surface of the upper tube seat 6, so as to better fit the lower tube seat 5 or the upper tube seat 6.

[0044] like Figure 1As shown, the base 1 is also provided with a first stepped hole 7, a second stepped hole 8, a weight-reducing hole 9, a first threaded hole 10, a second threaded hole 12, and a long strip groove 15. The four first stepped holes 7 are used to position the upper positioning pin 41. The four first stepped holes 8 are used to position the lower positioning diamond pin 3. The weight-reducing hole 9 is a central circular hole used to reduce weight and eliminate welding thermal stress concentration. A first threaded hole 10 is provided on the side wall of the weight-reducing hole 9, and the first threaded hole 10 leads to the first stepped hole 7. The first stepped hole 7 is adapted to the locking screw 11, and the upper positioning pin 4 is inserted into the second stepped hole 8, and the upper positioning pin 41 is fixed / locked from the side by the locking screw 11. The locking screw 11 is a standard locking screw, such as a hexagonal cylindrical barrel screw or a hexagonal flat-end tightening screw. The base 1 is connected to the electron beam welding equipment through 6 evenly distributed second threaded holes 12, and conventional screws can be used. The long strip grooves 15 at both ends are used to install positioning welding production samples and welding test samples.

[0045] like Figure 2 and Figure 3 As shown, the four threaded holes perpendicular to the plate thickness direction are used to install the first limit rod 16 and the second limit rod 17 respectively to prevent the sample from being inserted too long and hindering the rotation of the fixture. The first limit rod 16 and the second limit rod 17 are shaft-like screw-like structures, which are installed in specific threaded holes to keep the welding sample perpendicular to the base bottom plate. In addition, they can also prevent the welding sample from being inserted too deeply into the fixture to affect the movement of the electron beam rotation axis.

[0046] like Figure 4 As shown, the lower positioning diamond pin 3 is a diamond-like stepped pin structure formed by the chamfered edge of a cylinder, which can be used for installation in one direction (a backhand installation position that is difficult to operate); the lower positioning diamond pin 3 has a fixed threaded hole at the bottom and a positioning pin and a screw at the top, which are used to locate the installation position of the lower tube seat.

[0047] like Figure 5 As shown, the upper positioning pin 41 is a replaceable upper positioning pin. The upper positioning pin 41 is also a stepped pin structure, which is convenient for quick disassembly and installation. The side of the upper positioning pin 41 cooperates with a standard tightening screw to fix the upper positioning pin 41.

[0048] like Figure 1 As shown, the clamping plate 2 is a special-shaped structural part, which is convenient for installation and fixation and heat dissipation of welded parts, and has stepped holes on four sides for auxiliary positioning. The clamping plate 2 is provided with a through hole, and the top of the lower positioning diamond pin 3 or the top of the upper positioning pin 41 passes through the corresponding through hole and is fixed by tightening the nut 13. Among them, the tightening nut 13 is a shaft-like structure, the internal threaded hole is used to tighten the nut to fix the welded part, the outer side has anti-slip texture to facilitate the tightening operation, and the stepped shaft at the lower end is used for auxiliary positioning.

[0049] A spring washer 14 is provided below the pressing plate 2, and the spring washer 14 is provided on the lower positioning diamond pin 3 or the upper positioning pin 4. The spring washer 13 is a standard structure, and is used for elastically giving way and locking and fixing the lower pipe seat 5 or the upper pipe seat 6.

[0050] like Figure 6 , Figure 7 , Fig.10 and Fig.11 As shown, when the present invention is clamped on the lower tube seat 5, its use method is as follows: before assembly, first remove the clamping plate 2 and tighten the nut 13 to leave assembly space; then pass the assembled spot-welded lower tube seat 5 through the lower positioning diamond pin 3 to achieve precise positioning; the clamping plate 2 passes through the lower positioning diamond pin 3 to press the lower tube seat 5, tighten the nut 13 into the stud at the head of the positioning pin and then press against the clamping plate 2, and finally tighten the nut 13 into the screw at the head of the lower positioning diamond pin and press against the stepped hole of the clamping plate to achieve rigid fixation, heat dissipation, and anti-welding plane deformation of the lower tube seat. After the product is fixed, weld the weld.

[0051] like Figure 8 , Fig. 9 , Fig.12 and Fig.13 As shown, when the present invention is clamped on the upper tube seat 6, its use method is as follows: before assembly, first remove the clamping plate 2 and tighten the nut 13 to leave assembly space; then install the replaceable upper positioning pin 41 in the positioning hole on the base 1; screw the standard tightening screw into the threaded hole on the side of the base to tighten the replaceable upper positioning pin 41; pass the assembled spot-welded upper tube seat 6 through the replaceable upper positioning pin to achieve precise positioning; the clamping plate passes through the replaceable upper positioning pin to press the upper tube seat 6, tighten the nut 13 into the stud at the head of the positioning pin to fix the clamping plate 2, and finally tighten the nut 13 into the screw at the head of the replaceable upper positioning pin and close to the clamping plate stepped hole to achieve rigid fixation, heat dissipation, and anti-welding plane deformation of the upper tube seat. After the product is fixed, weld the weld.

[0052] As another possible implementation method, Figures 14 to 16 As shown, the upper positioning member is an upper positioning sleeve 42. The upper positioning sleeve 42 has two cylindrical connecting parts, and the side of the cylindrical connecting part has a pin hole 19. The cylindrical connecting part is connected to the top of the lower positioning pin 3, and is inserted into the pin hole 19 through a pin key 18 (a pin key positioning fixing groove is provided on the lower positioning diamond pin 3) to fix the upper positioning sleeve 42 and the lower positioning diamond pin 3. The two cylindrical connecting parts are connected to a connecting block, and the connecting block is provided with two threaded columns for passing through the clamping plate 2 to connect the tightening nut 13. The connecting block can cooperate with the clamping plate 2 to jointly clamp the upper pipe seat 6 from both inside and outside to accurately position the upper pipe seat 6 and increase welding quality and efficiency.

[0053] Only two lower positioning pins 3 are needed to complete the welding of the lower tube seat 5, and preferably, the two lower positioning pins 3 are fixed on the base 1 by screwing standard screws into the bottom, or the lower positioning pins 3 can be fixed by welding, or the two lower positioning pins 3 are integrally formed with the base 1, and the base 1 no longer needs to have a second stepped hole 8 for installing the lower positioning pins 3. This reduces the number of holes in the base 1, reduces the time for users to judge the installation holes, and thus reduces the installation time and the probability of installation errors. It also overcomes the problem of different installation accuracies of the two lower positioning pins 3 by different users, so that the welding accuracy of the lower tube seat 5 is consistent, reducing the differences in welding products caused by human installation factors.

[0054] After welding the lower tube seat 5, when welding the upper tube seat 6, it is only necessary to install the upper positioning sleeve 42 onto the lower positioning diamond pin 3 to achieve positioning and installation of the upper tube seat 6; when welding the lower tube seat 5 again, the upper positioning sleeve 42 is directly removed, and the lower tube seat 5 is assembled and welded using the lower positioning diamond pin 3, and the upper positioning sleeve 42 is installed back when welding the upper tube seat 6, and so on. By simply disassembling and installing the upper positioning sleeve 42, the continuous welding of the lower tube seat 5 and the upper tube seat 6 is achieved, and the welding process is continuous and fast, and there is no need to replace a new fixture, which improves work efficiency and reduces the probability of error.

[0055] The electron beam welding fixture for quickly replacing the tube socket product provided by the present invention can ensure that after the electron beam welding of the tube socket is completed, the lateral shrinkage deformation of the weld is less than 0.15mm, and the longitudinal shrinkage deformation of the weld is less than 0.30mm. Using the fixture of the present application, there is no need to replace the fixture. Only two positioning columns need to be quickly disassembled and replaced to achieve welding production switching of different types of tube socket products, thereby improving production efficiency by more than 30%, and having good economic value.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electron beam welding fixture capable of quickly replacing a tube socket product, characterized in that: The invention comprises a base (1) and a clamping plate (2), wherein the base (1) is connected with a lower positioning diamond pin (3) and an upper positioning member, wherein the lower positioning diamond pin (3) is used to position a lower tube seat (5), and the upper positioning member is used to position an upper tube seat (6), and the clamping plate (2) is a plate-shaped structure used to clamp the lower tube seat (5) or the upper tube seat (6); the upper positioning member is an upper positioning sleeve (42), and the upper positioning sleeve (42) is detachably connected to the lower positioning diamond pin (3). The upper positioning member is an upper positioning pin (41), and the length of the upper positioning pin (41) is greater than that of the lower positioning diamond pin (3); the rectangular bottom surface of the clamping plate (2) is the same as the top surface of the lower tube seat (5) or the top surface of the upper tube seat (6); a through hole is provided on the clamping plate (2), and the top of the lower positioning diamond pin (3) or the top of the upper positioning pin (41) passes through the through hole to achieve positioning and limiting.

2. The electron beam welding fixture for quickly replacing a tube socket product according to claim 1, characterized in that: The base (1) is provided with four first stepped holes (7) for positioning the upper positioning pin (41), and the base (1) is provided with four second stepped holes (8) for positioning the lower positioning diamond pin (3).

3. The electron beam welding fixture for quickly replacing a tube socket product according to claim 2, characterized in that: A weight-reducing hole (8) is provided at the center of the base (1), a first threaded hole (9) is provided on the side wall of the weight-reducing hole (8), and the first threaded hole (9) leads to the first stepped hole (7).

4. The electron beam welding fixture for quickly replacing a tube socket product according to claim 3, characterized in that: A locking screw (10) is provided in the first threaded hole (9) for fixing the upper positioning pin (41).

5. The electron beam welding fixture for quickly replacing a tube socket product according to claim 1, characterized in that: The base (1) is also provided with six second threaded holes (11), and the second threaded holes (11) are connected to the electron beam welding equipment via screws.

6. The electron beam welding fixture for quickly replacing a tube socket product according to claim 1, characterized in that: The top of the lower positioning pin (3) or the top of the upper positioning pin (41) is fixed by tightening the nut (13).

7. The electron beam welding fixture for quickly replacing a tube socket product according to claim 1, characterized in that: A spring washer (14) is provided below the clamping plate (2), and the spring washer (14) is sleeved on the lower positioning diamond pin (3) or the upper positioning pin (41).

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