Welding fixture for metal fuel tank

Abstract

The utility model relates to tooling technical field discloses a kind of welding tool for metal oil tank, for the welding tool of metal oil tank, comprising: base, for supporting oil tank half shell, oil tank half shell is provided with mounting hole, the first end of oil filler is inserted into the inside of oil tank half shell via mounting hole, and the outer wall of oil filler is provided with convex ring, and convex ring is suitable for with mounting hole interference fit;Clamping device, it is set to the side of mounting hole towards the inside of oil tank half shell, suitable for clamping the first end of oil filler, and along the axis direction of oil filler, clamping device has the first state away from mounting hole;Pressing mechanism;Welding equipment.The welding tool for metal oil tank provided by the utility model, clamping device is set to the side of mounting hole towards the inside of oil tank half shell, after clamping oil filler, drive oil filler to move a certain distance towards the direction of the inside of oil tank half shell, so that oil filler keeps pressing on oil tank half shell, avoid the laser beam and wire-feeding space of welding equipment to cause interference.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, specifically to a welding tooling for metal oil tanks. Background Technology

[0002] Hybrid electric vehicles are developing rapidly. Compared to the atmospheric pressure fuel tanks used in traditional gasoline vehicles, hybrid vehicles typically use high-pressure fuel tanks with higher internal pressure. The high-pressure fuel tank shell is usually made of metal, and the filler neck, located on the fuel tank shell for filling the tank, is also usually made of metal. The fuel tank shell and filler neck are welded together. In laser welding of the fuel tank shell and filler neck, to maintain a stable and tight contact between the filler neck and the fuel tank shell, current welding fixtures usually have a clamping mechanism on the outside of the fuel tank shell to fix the relative position of the filler neck and the fuel tank shell, thus ensuring that the relative position of the filler neck and the fuel tank shell does not move unexpectedly during the welding process. However, during welding, the filler neck needs to be fully welded around its circumference to meet airtightness and strength requirements. The clamping mechanism on the outside of the fuel tank shell usually interferes with the incident space of the laser beam and the wire feeding mechanism, thus affecting the accessibility of the laser welding, and consequently affecting the welding efficiency and quality. Utility Model Content

[0003] In view of this, the present invention provides a welding fixture for metal oil tanks to solve the problem that the clamping mechanism outside the oil tank shell often interferes with the incident space of the laser beam and the wire feeding mechanism, thereby affecting the weld accessibility of laser welding.

[0004] This utility model provides a welding fixture for metal fuel tanks, used for welding the fuel tank half-shell and the filler neck. The welding fixture for metal fuel tanks includes:

[0005] The base is used to support the fuel tank half shell. The fuel tank half shell is provided with mounting holes. The first end of the fuel filler port extends into the fuel tank half shell through the mounting holes. The outer wall of the fuel filler port is provided with a protruding ring, which is suitable for interference fit with the mounting holes.

[0006] The clamping device is movably disposed on the side of the mounting hole facing the inside of the oil tank half shell. The clamping device is adapted to clamp the outer wall of the first end of the oil filling port, and along the axial direction of the oil filling port, the clamping device has a first state away from the mounting hole and a second state close to the mounting hole.

[0007] A clamping mechanism is used to clamp the oil tank half-shell onto the base;

[0008] Welding equipment suitable for welding fuel tank half-shells and filler necks.

[0009] In one alternative embodiment, the clamping device includes a plurality of jaws adapted to come together or separate from each other to clamp or release the oil filler port.

[0010] In one alternative embodiment, the outer wall of the first end is provided with a protrusion, and the sides of the multiple claws that are close to each other are provided with slots, and the protrusion is adapted to be inserted into the slots.

[0011] In one alternative embodiment, the welding fixture for the metal fuel tank further includes a tensioning drive device, which includes a movable end that moves in a direction parallel to the axis of the fuel filler neck. The movable end is fixedly connected to a clamping device to facilitate switching of the clamping device between a first state and a second state.

[0012] In one optional embodiment, the fuel tank half shell is provided with a plurality of through holes, and the base is provided with a pre-positioning pin corresponding to the through holes. The pre-positioning pin is adapted to pass through the through holes, and the outer diameter of the pre-positioning pin is smaller than the inner diameter of the through holes.

[0013] In one alternative embodiment, the main plane of the base is arranged vertically, and a support block is provided in the lower region of the main plane of the base, the support block being adapted to abut against the lower edge of the fuel tank half shell.

[0014] In one alternative embodiment, the clamping mechanism includes a clamping drive device and a clamping part. The movable part of the clamping drive device is adapted to move in a direction perpendicular to the main plane of the base. The movable part is connected to the clamping part to drive the clamping part to move closer to or away from the oil tank half-shell. The clamping part is adapted to abut against the side of the oil tank half-shell away from the base.

[0015] In one alternative embodiment, the clamping part is rotatably connected to the movable part, and along a direction perpendicular to the main plane of the base, the clamping part has a first position in which its projection falls on the fuel tank half shell, and a second position in which its projection avoids the fuel tank half shell.

[0016] In one alternative embodiment, there are multiple clamping mechanisms, which are equidistantly spaced along the edge of the tank half-shell.

[0017] In one alternative implementation, a photoelectric sensor is provided on the base, which is used to detect whether there is a filler port on the fuel tank half-shell.

[0018] The technical solution of this utility model has the following advantages:

[0019] 1. The welding fixture for metal fuel tanks provided by this utility model has a clamping device located on the side of the mounting hole facing the inside of the fuel tank half-shell. After clamping the fuel filler port, it moves the fuel filler port a certain distance toward the inside of the fuel tank half-shell so that the fuel filler port is kept pressed on the fuel tank half-shell. While ensuring the stability of the weld, it can also avoid interference with the laser beam and wire feeding space of the welding equipment, thereby improving welding efficiency and welding quality.

[0020] 2. The welding fixture for metal oil tanks provided by this utility model has a slot on the chuck, and the reliability of the pneumatic chuck moving the oil filling port is improved by the interlocking of the protrusion and the chuck.

[0021] 3. The welding fixture for metal oil tanks provided by this utility model facilitates rapid rough positioning of the oil tank half shell by setting a pre-positioning pin on the base and making the outer diameter of the pre-positioning pin smaller than the inner diameter of the through hole, and reserves space for adjusting the position of the oil tank half shell.

[0022] 4. The welding fixture for metal oil tanks provided by this utility model has a support block on the base to support the half shell of the oil tank and to assist in positioning the half shell of the oil tank.

[0023] 5. The welding fixture for metal oil tanks provided by this utility model presses the oil tank half shell onto the base through the clamping part, so as to avoid the oil tank half shell from moving accidentally during the welding process, which is conducive to improving the welding quality.

[0024] 6. The welding fixture for metal oil tanks provided by this utility model allows the clamping part to be rotatably connected to the movable part, so that when it is necessary to remove the oil tank half shell from the base, the clamping part can be moved from the first position to the second position, thereby facilitating the removal of the oil tank half shell from the base.

[0025] 7. The welding fixture for metal oil tanks provided by this utility model distributes multiple clamping mechanisms at equal intervals along the circumferential edge of the oil tank half shell, so that the force applied to the oil tank half shell is more evenly distributed, which helps to avoid the oil tank half shell from shifting position and from deforming. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a welding fixture for a metal fuel tank and the matching of the fuel tank half-shell and the filler port according to an embodiment of the present utility model.

[0028] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0029] Figure 3 for Figure 1 The diagram shows the structure of the welding fixture and the oil filler port.

[0030] Figure 4 for Figure 3 A magnified view of part B in the diagram;

[0031] Figure 5 for Figure 4 The diagram shows the structure of the clamping device.

[0032] Figure 6 for Figure 3 A magnified view of part of C;

[0033] Figure 7 for Figure 1 The diagram shown is a structural schematic of the fuel tank half-shell.

[0034] Figure 8 for Figure 7 A magnified view of part of D;

[0035] Figure 9 for Figure 1 The diagram shows the structure of the filler neck.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Fuel tank half shell; 2. Filler neck; 201. Protrusion; 3. Clamping device; 301. Claw; 302. Slot; 4. Tensioning drive device; 5. Through hole; 6. Base; 7. Support block; 8. Pre-positioning pin; 9. Pressing drive device; 10. Pressing part; 101. Pressing rod; 102. Adjusting bolt; 11. Limiting plate; 12. Photoelectric sensor; 13. Protruding ring; 14. Rounded corner surface; 15. Pressure sensor; 16. Mounting hole. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] The following is combined with Figures 1 to 9 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, a welding fixture for a metal fuel tank is provided for welding the fuel tank half-shell 1 and the filler neck 2. The welding fixture for the metal fuel tank includes:

[0041] The base 6 is used to support the oil tank half shell 1. The oil tank half shell 1 is provided with a mounting hole 16. The first end of the oil filling port 2 extends into the oil tank half shell 1 through the mounting hole 16. The outer wall of the oil filling port 2 is provided with a protruding ring 13, which is suitable for interference fit with the mounting hole 16.

[0042] The clamping device 3 is movably disposed on the side of the mounting hole 16 facing the inside of the oil tank half shell 1. The clamping device 3 is adapted to clamp the outer wall of the first end of the oil filling port 2, and along the axial direction of the oil filling port 2, the clamping device 3 has a first state away from the mounting hole 16 and a second state close to the mounting hole 16.

[0043] A clamping mechanism is used to clamp the oil tank half-shell 1 onto the base 6;

[0044] Welding equipment suitable for welding the fuel tank half shell 1 and the fuel filler port 2.

[0045] The welding fixture for metal oil tanks provided in this embodiment has a clamping device 3 located on the side of the mounting hole 16 facing the inside of the oil tank half-shell 1. After clamping the filling port 2, it moves the filling port 2 a certain distance toward the inside of the oil tank half-shell 1 so that the filling port 2 is kept pressed on the oil tank half-shell 1. This ensures the stability of the weld and avoids interference with the laser beam and wire feeding space of the welding equipment, thereby improving welding efficiency and welding quality.

[0046] Specifically, the fuel tank shell consists of two fuel tank halves 1. One of the fuel tank halves 1 has a mounting hole 16. The junction between the inner wall of the mounting hole 16 and the outer wall of the fuel tank halves 1 is constructed as a rounded corner surface 14, so that the mounting hole 16 is in a flared shape, and the flared direction faces the inside of the fuel tank halves 1. The second end of the filler neck 2 is exposed outside the fuel tank shell. A raised ring 13 is provided on the outer wall of the filler neck 2 in the area between its first and second ends. The outer diameter of the raised ring 13 is larger than the inner diameter of the mounting hole 16. The first end of the filler neck 2 extends into the inside of the fuel tank halves 1 until the raised ring 13 contacts the rounded corner surface 14, and the raised ring 13 and the rounded corner surface 14 form a weld. The axial direction of the filler neck 2 is parallel to the axial direction of the mounting hole 16. The clamping device 3 clamps the first end of the filler neck 2 and moves the filler neck 2 a certain distance toward the inside of the tank half-shell 1. This causes an interaction force between the convex ring 13 and the rounded corner surface 14 of the mounting hole 16, thereby forming an interference fit between the convex ring 13 and the mounting hole 16. Through the transmission of force, the tank half-shell 1 is adjusted to a position where the axis of its mounting hole 16 coincides with the axis of the filler neck 2, thus achieving precise positioning of the weld and improving welding quality. Furthermore, since the clamping device is positioned on the side of the mounting hole 16 facing the inside of the tank half-shell 1, interference with the laser beam and wire feeding space can be avoided.

[0047] The welding equipment is a laser welding device, which is set on the outside of the fuel tank half-shell 1 and is used to weld the seam. The open side of the fuel tank half-shell 1 faces the base 6 and is adapted to abut against the base 6. The clamping mechanism is used to abut against the side of the fuel tank half-shell 1 away from the base 6, thereby pressing the fuel tank half-shell 1 tightly onto the base 6. This helps to prevent the fuel tank half-shell 1 from moving accidentally during the welding process, thereby ensuring the welding quality.

[0048] Furthermore, a detachable limiting plate 11 is fixedly connected to the base 6. After the fuel tank half-shell 1 is installed onto the welding fixture, the limiting plate 11 is located inside the fuel tank half-shell 1. The limiting plate 11 is positioned close to the mounting hole 16 and has clearance holes corresponding to the mounting hole 16 and the filler port 2. The limiting plate 11 is adapted to abut against the inner wall of the fuel tank half-shell 1 to support and limit the area around the mounting hole 16 of the fuel tank half-shell 1 when the clamping device 3 moves the filler port 2 toward the inside of the fuel tank half-shell 1, thus preventing deformation.

[0049] The base 6 is also provided with multiple cutouts so that after the oil tank half shell 1 is installed, it can approach the area between the inner wall of the oil tank half shell 1 and the base 6 through the cutouts, and reduce the weight of the tooling.

[0050] In one embodiment, combined Figure 4 As shown, the clamping device 3 includes multiple jaws 301, which are adapted to come together or separate from each other to clamp or release the oil filler port 2.

[0051] Specifically, the clamping device 3 includes a pneumatic chuck, an electric chuck, or a hydraulic chuck. The clamping device 3 moves along the axial direction of the filler port 2 until its jaws 301 can clamp the filler port 2. Multiple jaws 301 converge to clamp the filler port 2. Then, the clamping device 3 moves in the opposite direction to press the filler port 2 against the mounting hole 16 of the oil tank half shell 1. At this time, the protruding ring 13 of the filler port 2 forms an interference fit with the mounting hole 16.

[0052] In one embodiment, combined Figure 4 , Figure 5 and Figure 9 As shown, the outer wall of the first end is provided with a protrusion 201, and the sides of the multiple claws 301 that are close to each other are provided with a slot 302, and the protrusion 201 is adapted to be inserted into the slot 302.

[0053] The welding fixture for metal oil tanks provided in this embodiment has a slot on the chuck 301. The reliability of the pneumatic chuck moving the oil filler port 2 is improved by the interlocking of the protrusion 201 and the chuck 301.

[0054] Specifically, the protrusion 201 is arranged around the circumference of the filler neck 2. When the clamping device 3 clamps the filler neck 2 with the claw 301, the protrusion 201 falls into the slot 302. The side wall of the slot 302 near the mounting hole 16 is adapted to abut against the side of the protrusion 201 near the mounting hole 16 to prevent the filler neck 2 from disengaging from the clamping device 3 during the movement of the filler neck 2.

[0055] In one embodiment, combined Figure 3 As shown, the welding fixture for the metal oil tank also includes a tensioning drive device 4. The tensioning drive device 4 includes a movable end that moves along a direction parallel to the axis of the oil filling port 2. The movable end is fixedly connected to the clamping device 3 to facilitate switching of the clamping device 3 between a first state and a second state.

[0056] Specifically, the tensioning drive device 4 also includes a fixing part fixedly connected to the base 6. The tensioning drive device 4 includes a cylinder, hydraulic cylinder, or electric cylinder, etc. It can be understood that the cylinder body of the cylinder, hydraulic cylinder, or electric cylinder serves as the fixing part, and the telescopic rod of the cylinder, hydraulic cylinder, or electric cylinder serves as the movable end. Under the drive of the tensioning drive device 4, the clamping device 3 is adapted to move or stop along the axial direction of the oil filler port 2.

[0057] In one embodiment, combined Figure 2 and Figure 7 As shown, the oil tank half shell 1 is provided with multiple through holes 5, and the base 6 is provided with a pre-positioning pin 8 corresponding to the through hole 5. The pre-positioning pin 8 is suitable for passing through the through hole 5, and the outer diameter of the pre-positioning pin 8 is smaller than the inner diameter of the through hole 5.

[0058] The welding fixture for metal oil tanks provided in this embodiment facilitates rapid rough positioning of the oil tank half shell 1 by setting a prepositioning pin 8 on the base 6 and making the outer diameter of the prepositioning pin 8 smaller than the inner diameter of the through hole 5, and reserving space for position adjustment of the oil tank half shell 1.

[0059] Specifically, the axial direction of the pre-positioning pin 8 is perpendicular to the main plane of the base 6. The pre-positioning pin 8 passes through the through hole 5 to quickly and coarsely position the fuel tank half-shell 1. During the process of the tensioning drive device 4 pressing the filler port 2 against the mounting hole 16 via the clamping device 3, the fuel tank half-shell 1 may move to a certain extent. Since the outer diameter of the pre-positioning pin 8 is smaller than the inner diameter of the through hole 5, space is reserved for the movement of the fuel tank half-shell 1. The pre-positioning pin 8 is detachably connected to the base 6 to adjust the position of the pre-positioning pin 8 on the base 6 according to different specifications of fuel tank half-shell 1.

[0060] In one embodiment, combined Figure 1 and Figure 3As shown, the main plane of the base 6 is arranged vertically, and a support block 7 is provided in the lower part of the main plane of the base 6. The support block 7 is adapted to abut against the lower edge of the oil tank half shell 1.

[0061] The welding fixture for metal oil tanks provided in this embodiment has a support block 7 on the base 6 to support the oil tank half shell 1 and assist in positioning the oil tank half shell 1.

[0062] Specifically, the base 6 is plate-shaped, and when the oil tank half-shell 1 is placed on the welding fixture, the mounting hole 16 of the oil tank half-shell 1 is positioned upwards. There is at least one support block 7, which is used to support the oil tank half-shell 1. The support block 7 is detachably connected to the base 6 so as to adjust the position of the support block 7 on the base 6 according to the different shapes of the oil tank half-shell 1.

[0063] In one embodiment, combined Figure 6 As shown, the clamping mechanism includes a clamping drive device 9 and a clamping part 10. The movable part of the clamping drive device 9 is adapted to move in a direction perpendicular to the main plane of the base 6. The movable part is connected to the clamping part 10 to drive the clamping part 10 to move closer to or away from the oil tank half shell 1. The clamping part 10 is adapted to abut against the side of the oil tank half shell 1 away from the base 6.

[0064] The welding fixture for metal fuel tanks provided in this embodiment uses the clamping part 10 to press the fuel tank half shell 1 onto the base 6, so as to avoid accidental movement of the fuel tank half shell 1 during the welding process, which is beneficial to improving the welding quality.

[0065] Specifically, the opening of the fuel tank half-shell 1 faces the base 6 and is adapted to abut against the base 6. The clamping part 10 is adapted to abut against the side of the fuel tank half-shell 1 opposite to the base 6 to press the fuel tank half-shell 1 firmly onto the base 6. The clamping drive device 9 includes a fixing part that is detachably and fixedly connected to the base 6. The fixing part is used to support the movement of the movable part in a direction perpendicular to the main plane of the base 6. The fixing part is detachably connected to the base 6 so as to adjust the position of the clamping drive device 9 on the base 6 according to the shape of the fuel tank half-shell 1, thereby improving applicability. The clamping drive device 9 includes a cylinder, a hydraulic cylinder, or an electric cylinder. It is understood that the cylinder body of the cylinder, hydraulic cylinder, or electric cylinder serves as the fixing part, and the telescopic rod of the cylinder, hydraulic cylinder, or electric cylinder serves as the movable part.

[0066] The clamping part 10 includes a strip-shaped or bent clamping rod 101. The clamping drive device 9 drives the clamping rod 101 to move in a direction perpendicular to the main plane of the base 6, thereby causing the clamping rod 101 to clamp or loosen the oil tank half-shell 1. The clamping part 10 also includes an adjusting bolt 102. One end of the clamping rod 101 is connected to the movable part, and the other end is provided with the adjusting bolt 102. The clamping rod 101 abuts against the oil tank half-shell 1 through the end of the adjusting bolt 102. The axis of the adjusting bolt 102 is perpendicular to the main plane of the base 6. By rotating the adjusting bolt 102, the position of the adjusting bolt 102 on the clamping rod 101 can be adjusted. On the one hand, after the position of the clamping rod 101 is fixed, the clamping force on the oil tank half-shell 1 can be adjusted by rotating the adjusting bolt 102. On the other hand, the clamping range of the clamping mechanism can be increased, improving its applicability.

[0067] In one embodiment, combined Figure 6 As shown, the clamping part 10 is rotatably connected to the movable part. Along the direction perpendicular to the main plane of the base 6, the clamping part 10 has a first position where its projection falls on the oil tank half shell 1, and a second position where its projection avoids the oil tank half shell 1.

[0068] The welding fixture for metal oil tanks provided in this embodiment allows the clamping part 10 to be rotatably connected to the movable part, so that when it is necessary to remove the oil tank half shell 1 from the base 6, the clamping part 10 can be moved from the first position to the second position, thereby facilitating the removal of the oil tank half shell 1 from the base 6.

[0069] Specifically, the rotating plane of the clamping part 10 is parallel to the main plane of the base 6. By rotating the clamping part 10 to the second position, it is convenient to disassemble and assemble the oil tank half shell 1 in a direction perpendicular to the main plane of the base 6, which helps to improve the ease of operation.

[0070] In one embodiment, combined Figure 1 and Figure 3 As shown, there are multiple clamping mechanisms, which are equidistantly spaced along the edge of the oil tank half-shell 1.

[0071] The welding fixture for metal oil tanks provided in this embodiment distributes multiple clamping mechanisms at equal intervals along the circumferential edge of the oil tank half-shell 1, so that the force applied to the oil tank half-shell 1 is distributed more evenly. This is beneficial to prevent the oil tank half-shell 1 from shifting position while clamping it, and to avoid or greatly reduce the deformation of the oil tank half-shell 1.

[0072] In one embodiment, combined Figure 1 and Figure 4 As shown, a photoelectric sensor 12 is installed on the base 6. The photoelectric sensor 12 is used to detect whether there is a filler port 2 on the oil tank half shell 1.

[0073] Specifically, the photoelectric sensor 12 is positioned near the mounting hole 16 and the filler neck 2 to detect whether the filler neck 2 is placed on the mounting hole 16. Furthermore, a pressure sensor 15 is also provided on the base 6 to detect whether the fuel tank half-shell 1 is installed on the base 6. A PLC controller is provided on the base 6, and the photoelectric sensor 12 and pressure sensor 15 are electrically connected to the PLC controller. After the fuel tank half-shell 1 is placed on the base 6, the sensors transmit signals to the PLC controller, which then controls the clamping device 3, the tensioning drive device 4, and the pressing drive device 9 to operate.

[0074] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A welding fixture for metal fuel tanks, characterized in that, The welding fixture for welding the half-shell (1) and the filler neck (2) of the fuel tank includes: A base (6) is used to support the oil tank half shell (1). The oil tank half shell (1) is provided with a mounting hole (16). The first end of the filler port (2) extends into the interior of the oil tank half shell (1) through the mounting hole (16). The outer wall of the filler port (2) is provided with a protruding ring (13). The protruding ring (13) is adapted to be interference-fitted with the mounting hole (16). A clamping device (3) is movably disposed on the side of the mounting hole (16) facing the inside of the oil tank half shell (1). The clamping device (3) is adapted to clamp the outer wall of the first end of the oil filling port (2). Along the axial direction of the oil filling port (2), the clamping device (3) has a first state away from the mounting hole (16) and a second state close to the mounting hole (16). A clamping mechanism is adapted to clamp the oil tank half shell (1) onto the base (6); Welding equipment suitable for welding the oil tank half shell (1) and the oil filling port (2).

2. The welding fixture for metal oil tanks according to claim 1, characterized in that, The clamping device (3) includes a plurality of jaws (301), which are adapted to come together or separate from each other to clamp or release the oil filler port (2).

3. The welding fixture for metal oil tanks according to claim 2, characterized in that, The outer wall of the first end is provided with a protrusion (201), and the sides of the plurality of claws (301) that are close to each other are provided with a slot (302), and the protrusion (201) is adapted to be inserted into the slot (302).

4. The welding fixture for metal oil tanks according to claim 1, characterized in that, The welding fixture for the metal oil tank further includes a tensioning drive device (4), which includes a movable end that moves along a direction parallel to the axis of the filling port (2). The movable end is fixedly connected to the clamping device (3) to facilitate switching of the clamping device (3) between the first state and the second state.

5. The welding fixture for metal oil tanks according to claim 1, characterized in that, The oil tank half shell (1) is provided with a plurality of through holes (5), and the base (6) is provided with a pre-positioning pin (8) corresponding to the through holes (5). The pre-positioning pin (8) is adapted to pass through the through holes (5), and the outer diameter of the pre-positioning pin (8) is smaller than the inner diameter of the through holes (5).

6. The welding fixture for metal oil tanks according to claim 1, characterized in that, The main plane of the base (6) is arranged vertically, and a support block (7) is provided in the lower part of the main plane of the base (6). The support block (7) is adapted to abut against the lower edge of the oil tank half shell (1).

7. The welding fixture for metal oil tanks according to claim 1, characterized in that, The clamping mechanism includes a clamping drive device (9) and a clamping part (10). The movable part of the clamping drive device (9) is adapted to move in a direction perpendicular to the main plane of the base (6). The movable part is connected to the clamping part (10) to drive the clamping part (10) to move closer to or away from the oil tank half shell (1). The clamping part (10) is adapted to abut against the side of the oil tank half shell (1) away from the base (6).

8. The welding fixture for metal oil tanks according to claim 7, characterized in that, The clamping part (10) is rotatably connected to the movable part. Along the direction perpendicular to the main plane of the base (6), the clamping part (10) has a first position where its projection falls on the oil tank half shell (1) and a second position where its projection avoids the oil tank half shell (1).

9. The welding fixture for metal oil tanks according to claim 7, characterized in that, The number of clamping mechanisms is multiple, and the multiple clamping mechanisms are arranged at equal intervals along the edge of the oil tank half shell (1).

10. The welding fixture for a metal oil tank according to any one of claims 1 to 9, characterized in that, A photoelectric sensor (12) is provided on the base (6), and the photoelectric sensor (12) is used to detect whether there is a filler port (2) on the oil tank half shell (1).

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