Welding fixture, positioner and welding system for fuel tank

Abstract

The application discloses a welding tool for an oil tank, a positioner and a welding system, and relates to the technical field of welding tools.The welding tool for the oil tank comprises a tool body, at least two supporting pieces and a plurality of pressing mechanisms, the tool body is provided with a work station for placing the oil tank, two supporting pieces are arranged on the tool body on the two sides of the work station, a plurality of pressing mechanisms are arranged on each supporting piece at intervals, the supporting pieces are driven to be close to the work station, and the pressing mechanisms on the supporting pieces press the edges of the oil tank, when a welding gun is used to weld near the pressing position of one of the pressing mechanisms, the current pressing mechanism is moved away from the work station, and after the welding gun is moved away from the pressing position, the current pressing mechanism is moved close to the work station and presses the edge again.The welding tool for the oil tank provided by the application can be widely applied to automatic welding production lines, and the pressing mechanism of the welding position is temporarily moved away to avoid interference with the welding gun, so that the welding can be smoothly carried out.

Description

Welding fixtures, positioners and welding systems for fuel tanks Technical Field

[0001] This invention belongs to the field of welding tooling technology, specifically a welding tooling, positioner and welding system for oil tanks. Background Technology

[0002] Currently, fuel tanks, as containers for storing fuel, are widely used in automobiles, construction machinery, aircraft and other fields. According to their shape, common types include rectangular fuel tanks and round tank fuel tanks.

[0003] For rectangular steel fuel tanks, the manufacturing process typically involves assembling and welding the bent and shaped side panels with the end plates on both sides. In related technologies, to achieve mass welding operations, the end plates and side panels are usually first spot-welded for positioning, then fixed to a specialized fixture. A welding robot is then used to complete the further welding work, replacing manual welding.

[0004] However, the existing tooling is fixed by pressing against the opposite sides of the oil tank (i.e., the enclosure). Due to the small size of the edges, the welding torch is prone to interference or collision with the fixture, which makes welding difficult. This problem urgently needs to be solved. Summary of the Invention

[0005] In view of this, the present invention provides a welding fixture, positioner and welding system for oil tanks, so as to at least solve the problem that the welding torch is prone to interference or collision with the fixture due to the small size of the edge of the existing oil tank, which makes it impossible to weld smoothly.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a welding fixture for an oil tank, comprising a fixture body, at least two support members and a plurality of clamping mechanisms, wherein the fixture body has a work station for placing the oil tank.

[0008] Two support components are respectively installed on the tooling body on both sides of the workstation, and multiple clamping mechanisms are provided on each support component at intervals.

[0009] The drive support moves closer to the work station, causing each clamping mechanism on each support to press the edge of the oil tank. When the welding gun is welding near the clamping position of one of the clamping mechanisms, the current clamping mechanism moves away from the work station. After the welding gun moves away from the clamping position, the current clamping mechanism moves closer to the work station and re-presses the edge.

[0010] As a further embodiment of the present invention, the clamping mechanism includes a clamping seat and a telescopic member, wherein the clamping seat is connected to the corresponding support member through the telescopic member;

[0011] The telescopic component is used to drive the clamping seat to move in a first direction to clamp the adjacent edge on the oil tank or to release the clamping.

[0012] As a further embodiment of the present invention, the clamping mechanism further includes a clamping assembly, which includes a clamping block;

[0013] The pressure block is rotated around the horizontal axis and is set on the side of the clamping seat facing the work station. The pressure block is used to clamp the side and top surfaces with adjacent edges.

[0014] As a further embodiment of the present invention, the clamping assembly also includes a connector, one end of which is rotatably connected to the clamping seat, and the other end is rotatably connected to the pressure block, and the rotation axis of the connector is parallel to the rotation axis of the pressure block.

[0015] As a further embodiment of the present invention, the clamping assembly also includes a plurality of elastic elements, and the clamping block is connected to the clamping seat through each elastic element so as to reset the clamping block.

[0016] As a further embodiment of the present invention, a downwardly angled mounting groove is provided on the side of the clamping seat facing the work station, and the pressure block, connecting parts and various elastic parts are located in the mounting groove.

[0017] One side of the rotating axis of the pressure block abuts against one side of the groove opening of the mounting slot through a vertically arranged elastic element, and the other side of the rotating axis of the pressure block abuts against the other side of the groove opening of the mounting slot through a horizontally arranged elastic element.

[0018] As a further embodiment of the present invention, the upper surface of the support member is provided with spaced pads, each pad being used to contact the bottom surface of the fuel tank.

[0019] And / or, the tooling body is provided with a positioning element on at least one side, the positioning element being used to contact the side of the oil tank.

[0020] As a further embodiment of the present invention, it also includes a guide and a drive, wherein two support members are relatively movable and connected to the guide and are respectively connected to the drive to move closer or further away from each other.

[0021] In a second aspect, the present invention also provides a positioner, including a frame, a cantilever, and any of the welding fixtures for an oil tank provided in the first aspect, wherein one side of the cantilever is rotatably mounted on the frame about a transverse axis, and the fixture body is rotatably mounted on the other side of the cantilever about a vertical axis.

[0022] Thirdly, the present invention also provides a welding system including a welding robot and the positioner provided in the second aspect, wherein the welding torch is located at the execution end of the welding robot.

[0023] Compared with the prior art, the beneficial effect of the present invention is that the welding fixture for the oil tank includes a fixture body, at least two support members and multiple clamping mechanisms. The fixture body has a station for placing the oil tank. The two support members are respectively arranged on the fixture body on both sides of the station. Multiple clamping mechanisms are spaced apart on each support member. Driving the support member close to the station causes each clamping mechanism on each support member to clamp the edge of the oil tank. When the welding gun is welding near the clamping position of one of the clamping mechanisms, the current clamping mechanism moves away from the station. After the welding gun moves away from the clamping position, the current clamping mechanism moves close to the station and re-clamps the edge.

[0024] Therefore, the welding fixture for oil tanks provided by the present invention avoids interference with the welding torch by temporarily removing the clamping mechanism of the part to be welded, thus ensuring smooth welding. After the welding torch completes welding at the current position, the clamping mechanism re-clamps the edge to prevent loosening. It can be widely used in automatic welding production lines, and the product consistency is good. Attached Figure Description

[0025] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 is a three-dimensional structural diagram of an existing fuel tank;

[0027] Figure 2 is a top view of the welding fixture for oil tanks provided by the present invention.

[0028] Figure 3 is a cross-sectional view along section AA in Figure 2;

[0029] Figure 4 is a cross-sectional view along section BB in Figure 2, showing the relationship of compression with part of the fuel tank;

[0030] Figure 5 is a magnified view of part C in Figure 4;

[0031] Figure 6 is a cross-sectional view along section DD in Figure 2;

[0032] Figure 7 is a side view of the positioner provided by the present invention.

[0033] Figure 8 is a three-dimensional structural diagram of the welding system provided by the present invention.

[0034] Figure label:

[0035] 10. Fuel tank; 11. Edge; 20. Frame; 30. Cantilever; 40. Welding robot; 41. Welding torch;

[0036] 100. Tooling body; 110. Positioning components;

[0037] 200. Support component; 210. Pad;

[0038] 300. Clamping mechanism; 310. Clamping seat; 311. Mounting groove; 320. Telescopic component; 330. Clamping assembly; 331. Clamping block; 332. Connecting component; 333. Elastic component;

[0039] 400. Guide components;

[0040] 500. Drive components. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0043] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0047] As shown in Figure 1, the existing fuel tank 10 has a roughly rectangular hollow structure. The end plates on both sides of the fuel tank 10 are recessed inward by a certain distance, that is, the part of the side plate that protrudes beyond the end plate in the transverse direction is the edge 11, which is usually about 10mm. After the side plate and the end plate are pre-positioned by spot welding, a welding robot is needed to further weld the periphery of the end plate and the side plate to ensure a seal. The weld is shown by the thick line in Figure 1. Since the periphery of the side plate is relatively soft and not easy to clamp, only the edge 11 at both ends has relatively strong compressive strength. Therefore, clamping this part is more ideal.

[0048] In the first aspect, as shown in Figures 1-6, an embodiment of the present invention provides a welding fixture for an oil tank, including a fixture body 100, at least two support members 200 and a plurality of clamping mechanisms 300, wherein the fixture body 100 has a station for placing the oil tank 10.

[0049] Two support members 200 are respectively installed on the tooling body 100 on both sides of the workstation, and multiple clamping mechanisms 300 are provided at intervals on each support member 200.

[0050] The drive support 200 moves closer to the work station, causing each clamping mechanism 300 on each support 200 to clamp the edge 11 of the oil tank 10. When the welding gun 41 is welding near the clamping position of one of the clamping mechanisms 300, the current clamping mechanism 300 moves away from the work station. After the welding gun 41 moves away from the clamping position, the current clamping mechanism 300 moves closer to the work station and re-clamps the edge 11.

[0051] In this embodiment, the tooling body 100 is used to support the oil tank 10, the support member 200, and the clamping mechanism 300, as shown in Figure 2. It can be a workbench, tooling plate, tooling frame, tooling shell, etc. It is generally a long body structure and can be spliced ​​from profiles, such as square steel, channel steel, etc. The tooling body 100 has a work position for placing the oil tank 10 flat, that is, the bottom surface of the oil tank 10 can be placed flat on the tooling body 100 or on the support member 200 on it.

[0052] In this embodiment, the support member 200 can be a support plate, support block, support frame, etc., as shown in Figure 2. The two support members 200 are located on both sides of the workstation and move relatively close to or away from each other. They can be connected to the tooling body 100 through guide components and drive components, such as moving in the left and right direction as shown in Figure 2.

[0053] In this embodiment, the clamping mechanism 300 is used to clamp the edge 11. It can be a telescopic mechanism, a reciprocating movement mechanism, etc. Multiple clamping mechanisms 300 are arranged at intervals on each support member 200. As shown in the up-down direction in Figure 2, each clamping mechanism 300 moves in the direction close to or away from the work station. It can be consistent with or intersect with the moving direction of the support member 200, but not perpendicular to it.

[0054] Specifically, referring to Figures 1 to 3, based on the installation dimensions of the edge 11 of the oil tank 10, the positions of each clamping mechanism 300 in the clamping state are adjusted. The oil tank 10 is placed on the workstation, and the two support members 200 are driven to move closer to each other, so that each clamping mechanism 300 on each support member 200 presses against the adjacent edge 11 on the oil tank 10. At this time, each clamping mechanism 300 is in the clamping state. Welding is performed along the periphery of the edge 11 by the welding torch 41. When the welding torch 41 is welding near the clamping position of one of the clamping mechanisms 300, the current clamping mechanism 300 moves away from the workstation to avoid the welding torch 41 and avoid interference or collision. After the welding torch 41 moves away from the clamping position, the current clamping mechanism 300 moves closer to the workstation and re-clamps the edge 11, and then the clamping mechanism 300 at the next position avoids the welding torch 41, and so on.

[0055] It should be noted that after the two support members 200 are clamped to the oil tank 10, they should be locked to the tooling body 100 to prevent free movement or loosening during the welding process. A self-locking structure should also be provided between the support members 200 and the tooling body 100 to prevent free movement.

[0056] Therefore, compared to the existing operation of fixing the edge 11 with a clamp and keeping it stationary, the welding fixture for oil tanks provided by the present invention avoids interference with the welding torch 41 by temporarily removing the clamping mechanism 300 of the part to be welded, thus ensuring smooth welding. After the welding torch 41 completes welding at the current position, the clamping mechanism 300 re-clamps the edge 11 to prevent loosening. It can be widely used in automatic welding production lines, and the product consistency is good.

[0057] In some embodiments, the clamping mechanism 300 includes a clamping seat 310 and a telescopic member 320, wherein the clamping seat 310 is connected to the corresponding support member 200 via the telescopic member 320.

[0058] The telescopic member 320 is used to drive the clamping seat 310 to move along the first direction to clamp the adjacent edge 11 on the oil tank 10 or to release the clamping.

[0059] For example, as shown in Figures 2 and 4, the telescopic member 320 can be a dual-axis or multi-axis cylinder, hydraulic cylinder, etc., which is installed at the bottom of the support member 200. The telescopic end of the telescopic member 320 is arranged obliquely upward along the side away from the work station and connected to the clamping seat 310, so that the clamping seat 310 can be driven to move along the first direction to clamp the adjacent edge 11 on the oil tank 10 or release the clamping. The angle between the first direction and the horizontal plane can be 30°~60°.

[0060] It should be noted that the support member 200 needs to have a hole to prevent the telescopic member 320 from passing through. Of course, the clamping seat 310 can also be replaced by other types of structures, and this embodiment does not impose too many restrictions on this.

[0061] Furthermore, in this embodiment, the clamping mechanism 300 also includes a clamping component 330, which includes a pressure block 331.

[0062] The pressure block 331 is rotatably mounted on the side of the clamping seat 310 facing the work station around the horizontal axis. The pressure block 331 is used to press the side and upper surface of the adjacent edge 11.

[0063] Specifically, as shown in Figures 4 and 5, the pressing block 331 has a pressing groove on the side facing the work station. The opening of the pressing groove is angled downwards. The top surface of the pressing groove is used to contact the upper surface of the edge 11, and the side surface of the pressing groove is used to contact the side surface of the edge 11. The pressing block 331 can be rotatably mounted on the pressing seat 310 on the side facing the work station via a rotating shaft, pin, etc. Its rotation axis is arranged laterally and is perpendicular to its own direction of movement.

[0064] In this way, when the pressure block 331 presses against the edge 11, it can be adaptively rotated and adjusted so that the force exerted by the pressure block 331 on the upper surface and side of the edge 11 is basically the same. While maintaining a large pressing force, it avoids the pressure from being concentrated on the upper surface or side of the edge 11 and causing indentations. This can minimize the damage to the edge 11 and thus ensure the surface quality of the product.

[0065] Furthermore, in this embodiment, the pressing assembly 330 also includes a connector 332, one end of which is rotatably connected to the pressing seat 310, and the other end is rotatably connected to the pressing block 331, and the rotation axis of the connector 332 is parallel to the rotation axis of the pressing block 331.

[0066] Specifically, as shown in Figure 5, the connector 332 can be a connecting plate, a connecting rod, etc. One end of the connector 332 can be rotatably connected to the side of the pressing seat 310 facing the work station through a rotating shaft, pin, etc., and its rotation axis is arranged in the transverse direction. The other end of the connector 332 can also be connected to the pressing block 331 through a rotating shaft, pin, etc., and the rotation axes of the two are parallel.

[0067] In this way, when there are dimensional differences in the thickness and width of the edges 11 on each oil tank 10 due to dimensional tolerances, slight deformation, etc., the pressure block 331 can also deflect within a certain range with the connecting piece 332 when rotating around its own axis, and further adaptively adjust the pressing position, thereby ensuring that the force of the pressure block 331 acting on the upper surface and side of the edge 11 is basically consistent, and while maintaining a large pressing force, it avoids the pressure from being concentrated on the upper surface or side of the edge 11 and causing indentations.

[0068] Furthermore, in this embodiment, the pressing assembly 330 also includes a plurality of elastic elements 333, and the pressing block 331 is connected to the pressing seat 310 through each elastic element 333 so that the pressing block 331 is reset.

[0069] Specifically, as shown in Figure 5, the elastic element 333 can be a compression spring, a torsion spring, etc. The pressure block 331 is connected to the pressure seat 310 through each elastic element 333, so that the pressure block 331 is held between the upper deflection limit position and the lower deflection limit position in the unpressed state.

[0070] Furthermore, in this embodiment, the clamping seat 310 has a downwardly angled mounting groove 311 on the side facing the work station, and the pressure block 331, the connector 332 and each elastic element 333 are located in the mounting groove 311.

[0071] One side of the rotation axis of the pressure block 331 abuts against one side of the groove opening of the mounting groove 311 through a vertically arranged elastic element 333, and the other side of the rotation axis of the pressure block 331 abuts against the other side of the groove opening of the mounting groove 311 through a horizontally arranged elastic element 333.

[0072] Specifically, as shown in Figure 5, the pressure block 331, the connector 332, and each elastic element 333 are embedded in the mounting groove 311. The plane along the rotation axis of the pressure block 331 and diagonally downward towards the station is the plane of symmetry. Elastic elements 333 are arranged on both sides of the plane of symmetry. The elastic elements 333 on one side of the rotation axis of the pressure block 331 are arranged vertically to apply a downward preload to the pressure block 331. The elastic elements 333 on the other side of the rotation axis of the pressure block 331 are arranged horizontally to apply a horizontal preload to the pressure block 331 towards the station. The structure is more compact and more reasonable.

[0073] In some embodiments, the upper surface of the support member 200 is provided with spaced pads 210, each pad 210 being used to contact the bottom surface of the oil tank 10.

[0074] Specifically, as shown in Figure 2, the pads 210 are used to provide spaced support for the bottom surface of the oil tank 10, solving the problem that the bottom surface of the oil tank 10 cannot fully contact the upper surface of the support member 200 due to unevenness. The pads 210 can be arranged at intervals along the extension direction of the support member 200, as shown vertically in Figure 2. The number and thickness of the pads 210 can be determined according to actual needs, and are not specifically limited in this embodiment.

[0075] And / or, the tooling body 100 is provided with a positioning element 110 on at least one side, the positioning element 110 being used to contact the side of the oil tank 10.

[0076] Specifically, as shown in Figures 2 and 3, the positioning element 110 is used for preliminary positioning when fixing the oil tank 10. It can be a positioning plate, positioning rod, etc. The positioning element 110 can be connected to one side of the tooling body 100, or the positioning element 110 can be arranged on all sides of the tooling body 100. It can be determined according to actual needs, and no specific limitation is made in this embodiment.

[0077] In some embodiments, the system further includes a guide 400 and a drive 500, with two supports 200 movably connected to the guide 400 and respectively connected to the drive 500 to move closer or further apart.

[0078] Specifically, as shown in Figures 2, 3, and 6, the guide member 400 can be a guide rod, guide rail, etc. Two guide members 400 are arranged side by side and extend along the moving direction of the support member 200. The bottom of the support member 200 can be slidably connected to the guide member 400 through a guide sleeve, slider, etc., to achieve stable movement.

[0079] Moreover, the driving component 500 can be a screw that extends along the moving direction of the support component 200. Both ends of the screw can be mounted on the tooling body 100 through bearing assemblies. The bottoms of the two support components 200 can be connected to the screw through threaded sleeves. The threads on the two support components 200 have different directions of rotation, so that turning the screw can easily drive the two support components 200 to move closer or further apart, and can achieve self-locking. The structure is simple and has good stability.

[0080] Of course, the guide 400 and the drive 500 can also be replaced by other types of components, depending on the actual needs. This embodiment does not impose too many restrictions on this.

[0081] Secondly, as shown in FIG7, the present invention also provides a positioner, including a frame 20, a cantilever 30 and a welding fixture for an oil tank provided in any of the above embodiments. One side of the cantilever 30 is rotatably mounted on the frame 20 about a first axis, and the fixture body 100 is rotatably mounted on the other side of the cantilever 30 about a second axis. The second axis intersects or is perpendicular to the first axis.

[0082] For example, the frame 20 has a column, and one side of the cantilever 30 can be connected to the column via a rotary motor or rotary engine, allowing the cantilever 30 to rotate around a horizontal axis, such as the X-axis in Figure 7. The tooling body 100 can be connected to the side of the cantilever 30 away from the column via a rotary motor or rotary engine, allowing the tooling body 100 to rotate around a vertical axis, such as the Z-axis in Figure 7. This facilitates adjustment of the position of the oil tank 10 and ensures smooth welding. The specific structure and composition of the frame 20 and the cantilever 30 can be determined according to actual needs, and this embodiment does not impose too many restrictions.

[0083] Therefore, the positioner provided in this embodiment of the invention, by configuring welding fixtures for oil tanks, avoids interference with the welding torch 41 by temporarily removing the clamping mechanism 300 of the part to be welded, thus ensuring smooth welding. After the welding torch 41 completes welding at the current position, the clamping mechanism 300 re-clamps the edge 11 to prevent loosening. It can be widely used in automatic welding production lines, and the product consistency is good.

[0084] Thirdly, as shown in FIG8, the present invention also provides a welding system, including a welding robot 40 and a positioner provided in any of the above embodiments, wherein the welding torch 41 is located at the execution end of the welding robot 40.

[0085] For example, the welding robot 40 can have multiple degrees of freedom and is set on one side of the positioner, with the welding torch 41 mounted on the execution end of the welding robot 40. In this way, with the rotational adjustment of the positioner and the adaptive adjustment of the welding robot 40, welding operations in various positions on the oil tank 10 can be completed, enabling various high-difficulty welding operations, resulting in better product consistency, replacing manual labor, and facilitating factory assembly line production.

[0086] Therefore, the welding system provided in this embodiment of the invention, by configuring a positioner, which is configured with welding fixtures for the oil tank, avoids interference with the welding torch 41 by temporarily removing the clamping mechanism 300 of the part to be welded, thus ensuring smooth welding. After the welding torch 41 completes welding at the current position, the clamping mechanism 300 re-clamps the edge 11 to prevent loosening. It can be widely used in automatic welding production lines, and the product consistency is good.

[0087] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A welding fixture for an oil tank, characterized in that, The assembly includes a tooling body (100), at least two support members (200), and multiple clamping mechanisms (300). The tooling body (100) has a station for placing an oil tank (10). Two support members (200) are respectively disposed on the tooling body (100) on both sides of the station. Multiple clamping mechanisms (300) are spaced apart on each support member (200). The support members (200) are driven to approach the station, so that each clamping mechanism (300) on each support member (200) clamps the edge (11) of the oil tank (10). Welding is performed near the clamping position of one of the clamping mechanisms (300) by the welding torch (41). When the welding torch (41) moves away from the clamping position, the clamping mechanism (300) moves closer to the station and re-clamps the edge (11). The clamping mechanism (300) includes a clamping seat (310) and a telescopic member (320). The clamping seat (310) is connected to the corresponding support member (200) via the telescopic member (320). The telescopic member (320) is used to drive the clamping seat (310) to move in a first direction to clamp the adjacent edge (11) on the oil tank (10) or release the clamping. The clamping mechanism (300) also includes a clamping assembly (330). The clamping assembly (330) includes a clamping block (331); the clamping block (331) is rotatably disposed on the clamping seat (310) facing the work station about a horizontal axis, and the clamping block (331) is used to clamp the side and upper surface near the edge (11); the clamping assembly (330) also includes a connector (332), one end of the connector (332) is rotatably connected to the clamping seat (310), and the other end is rotatably connected to the clamping block (331), and the rotation axis of the connector (332) is parallel to the rotation axis of the clamping block (331); the clamping assembly (330) also includes a plurality of elastic elements (333), the clamping block (331) The pressure block (331) is connected to the clamping seat (310) through each of the elastic elements (333) so that the pressure block (331) is reset; the clamping seat (310) has a downwardly angled mounting groove (311) on the side facing the work station, and the pressure block (331), the connector (332) and each of the elastic elements (333) are located in the mounting groove (311); one side of the rotation axis of the pressure block (331) abuts against one side of the groove opening of the mounting groove (311) through the vertically arranged elastic element (333), and the other side of the rotation axis of the pressure block (331) abuts against the other side of the groove opening of the mounting groove (311) through the horizontally arranged elastic element (333).

2. The welding fixture for an oil tank according to claim 1, characterized in that, The upper surface of the support member (200) is provided with spaced pads (210), each of the pads (210) being used to contact the bottom surface of the oil tank (10); and / or, the tooling body (100) is provided with a positioning member (110) on at least one side, the positioning member (110) being used to contact the side of the oil tank (10).

3. The welding fixture for an oil tank according to claim 1 or 2, characterized in that, It also includes a guide (400) and a drive (500), with two of the support members (200) being movably connected to the guide (400) and respectively connected to the drive (500) to move closer or further away from each other.

4. A positioner, characterized in that, The assembly includes a frame (20), a cantilever (30), and a welding fixture for an oil tank as described in any one of claims 1 to 3, wherein one side of the cantilever (30) is rotatably mounted on the frame (20) about a transverse axis, and the fixture body (100) is rotatably mounted on the other side of the cantilever (30) about a vertical axis.

5. A welding system, characterized in that, Includes a welding robot (40) and a positioner as described in claim 4, wherein the welding torch (41) is located at the execution end of the welding robot (40).

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