A spot welding device and method for a fuel tank square shell

Abstract

The application relates to the technical field of spot welding, in particular to a spot welding device and method for an oil tank square shell; the device comprises a first supporting assembly, a second supporting assembly and an electrode assembly; the first supporting assembly comprises a first rolling unit and a first supporting unit; the first rolling unit is rotationally connected with the first supporting unit; the rotation axis of the first rolling unit extends along a first horizontal direction; the second supporting assembly is arranged at intervals with the first supporting assembly along the first horizontal direction; the second supporting assembly comprises a second rolling unit and a second supporting unit; the second supporting unit is rotationally connected with the second rolling unit; the rotation axis of the second rolling unit extends along the first horizontal direction; thus, the problems that the self weight of the oil tank square shell is large, manual stable support for maintaining a specified welding height is difficult, the shell overturning is completely completed by manpower, the process operation convenience is poor and the overall processing efficiency is low are solved.

Description

Technical Field

[0001] This application relates to the field of spot welding technology, and more specifically, to a spot welding device and method for a square shell of an oil tank. Background Technology

[0002] In the field of fuel tank manufacturing, the rectangular shell of a fuel tank is cylindrical with a square cross-section. Internally, it typically requires the assembly of a baffle sub-assembly to enhance structural strength and divide the cavities. After the baffle sub-assembly is placed inside the rectangular shell, its outer peripheral wall abuts against the inner peripheral wall of the rectangular shell. The two are connected and fixed in the abutment area using multi-point spot welding. Currently, spot welding is usually performed by operators in conjunction with an electrode assembly. The electrode assembly is used to apply spot welding to the abutment area between the baffle sub-assembly and the rectangular shell. When welding the abutment areas on different sides, the welding surface of the rectangular shell needs to be changed; that is, the rectangular shell needs to be flipped so that the side to be welded faces the electrode assembly.

[0003] However, due to the large weight of the square shell of the fuel tank, the square shell needs to be maintained at a specific working height during the spot welding operation and flipped between different welding surfaces. It is difficult to stably support the shell and maintain the specified welding height by relying solely on manual labor, and the flipping operation is also very laborious, resulting in low operational convenience and low processing efficiency of the spot welding process. Summary of the Invention

[0004] To address the problems of the large self-weight of the square shell of the fuel tank, the difficulty for manual support to maintain the specified welding height, and the fact that shell rotation is entirely dependent on manual operation, resulting in poor process convenience and low overall processing efficiency, this application provides a spot welding device and method for the square shell of the fuel tank.

[0005] In a first aspect, this application provides a spot welding device for a square shell of an oil tank, wherein the square shell of the oil tank is cylindrical and has a square cross-section;

[0006] The spot welding device includes:

[0007] The first support assembly includes a first rolling unit and a first support unit; the first rolling unit is rotatably connected to the first support unit; the rotation axis of the first rolling unit extends along a first horizontal direction.

[0008] A second support component is provided at a distance from the first support component along the first horizontal direction; the second support component includes a second rolling unit and a second support unit; the second support unit is rotatably connected to the second rolling unit; the rotation axis of the second rolling unit extends along the first horizontal direction.

[0009] An electrode assembly is located between a first support assembly and a second support assembly; the electrode assembly includes a first electrode unit and a second electrode unit; the first electrode unit and the second electrode unit are vertically spaced apart; the height difference between the first electrode unit and the second electrode unit is adjustable;

[0010] When the spot welding device is in operation, the inner peripheral wall of the square shell of the oil tank abuts against the first rolling unit and the second rolling unit respectively under the action of gravity; the square shell of the oil tank is moved along the second horizontal direction to perform spot welding, and the square shell of the oil tank is rotated to change the welding surface; wherein, the second horizontal direction is perpendicular to the first horizontal direction.

[0011] Optionally, the first rolling unit includes a first roller and a second roller located at the same height; during the rotation of the square shell of the oil tank, along the first horizontal direction, the distance between the first roller and the second rolling unit is greater than the distance between the second roller and the second rolling unit.

[0012] When the spot welding device is in operation, the square shell of the oil tank moves along the second horizontal direction and simultaneously abuts against the first roller and the second roller; when the square shell of the oil tank rotates, it is spaced apart from the first roller along the first horizontal direction, and the square shell of the oil tank abuts against the second roller.

[0013] Optionally, the second rolling unit includes a support module and a plurality of third rollers; the third rollers are rotatably connected to the support module; the support module is rotatably connected to the second support unit about a first axis; the axis of the third rollers and the first axis both extend along the first horizontal direction; the first axis and the axis of the third rollers are parallel and spaced apart; the plurality of third rollers are rotationally symmetrically distributed about the first axis; the first axis coincides with the axis of the second rollers.

[0014] Optionally, in the first horizontal direction, the distance between the electrode assembly and the first rolling unit is smaller than the distance between the electrode assembly and the second rolling unit.

[0015] Optionally, the axial distance between two adjacent third rollers is a first distance;

[0016] The axial distance between the first roller and the second roller along the second horizontal direction is the second distance; the second distance is less than the first distance.

[0017] Optionally, the position of the first roller along the first horizontal direction is adjustable.

[0018] Optionally, in the second horizontal direction, the distance between the first roller and the electrode assembly is greater than the distance between the second roller and the electrode assembly.

[0019] In a second aspect, this application provides a spot welding method for a square tank shell, wherein the spot welding method is applied to the spot welding apparatus for the square tank shell described in any one of the first aspects, and the spot welding method includes:

[0020] The partition assembly is placed inside the square shell of the fuel tank, so that the outer peripheral wall of the partition assembly abuts against the inner peripheral wall of the square shell of the fuel tank; wherein the abutting area extends along the circumference of the square shell of the fuel tank, and the abutting area on the upper side extends along the second horizontal direction.

[0021] The upper inner peripheral wall of the square shell of the oil tank abuts against the first rolling unit and the second rolling unit respectively; wherein the first rolling unit and the second rolling unit are spaced apart from the abutment area.

[0022] The square shell of the oil tank is moved intermittently along the second horizontal direction. During the static gap, the upper abutment area is spot welded through the first electrode unit and the second electrode unit.

[0023] Once the spot welding of the abutment area on the upper side is completed, control the rotation of the square shell of the oil tank so that the other side of the square shell of the oil tank faces upward.

[0024] Returning to the process of intermittently moving the square shell of the oil tank along the second horizontal direction, spot welding the upper contact area through the first electrode unit and the second electrode unit during the static gap, and repeating the process until the spot welding of the contact area is completed.

[0025] Optionally, after spot welding is completed on the upper abutment area, the square shell of the fuel tank is rotated so that the other side of the square shell of the fuel tank faces upward, including:

[0026] The first roller is positioned at a distance from the square shell of the oil tank along the first horizontal direction.

[0027] The square shell of the oil tank is controlled to overlap with the second roller and rotate around the axis of the second roller;

[0028] After the square shell of the oil tank has rotated, the first roller is controlled to abut against the square shell of the oil tank.

[0029] Optionally, the control first roller and the square housing of the oil tank are spaced apart along the first horizontal direction, including:

[0030] Adjust the position of the first roller along the first horizontal direction until the first roller and the square shell of the oil tank are spaced apart along the first horizontal direction.

[0031] Optionally, the control first roller and the square housing of the oil tank are spaced apart along the first horizontal direction, including:

[0032] The square shell of the oil tank is moved along the first horizontal direction until the first roller and the square shell of the oil tank are spaced apart along the first horizontal direction.

[0033] Optionally, during the rotation of the square shell of the oil tank around the axis of the second roller, the end of the upper abutment area away from the second roller swings downward.

[0034] To address the issues of the large weight of the square tank shell, the difficulty in maintaining its stable welding height manually, and the fact that shell rotation relies entirely on manual labor, resulting in poor operational convenience and low overall processing efficiency, this application offers the following advantages:

[0035] The first and second support components provide support and limit at both ends of the square tank shell, maintaining the specified welding height and improving the ease of operation and processing efficiency of the spot welding process. The inner circumferential wall of the square tank shell abuts against the first and second rolling units under gravity, allowing the dragging of the square tank shell along the second horizontal direction and the rotational movement to change the welding surface to be achieved through the rolling of the first and second rolling units, thus reducing the driving force required for flipping. The electrode assembly enables spot welding of the upper abutment area during the stationary gap of the square tank shell moving along the second horizontal direction, achieving continuous point-to-point welding of the circumferentially extending abutment area, thereby meeting the processing requirements for multi-point spot welding connections between the partition sub-assembly and the square tank shell. Attached Figure Description

[0036] Figure 1 An isometric view of the spot welding device for the square shell of the fuel tank in Embodiment 1 is shown;

[0037] Figure 2 It shows Figure 1 A front view of the spot welding device for the square shell of the fuel tank;

[0038] Figure 3 It shows Figure 2 A front view of the first support assembly of the spot welding device for the square shell of the fuel tank;

[0039] Figure 4 It shows Figure 2 A front view of the second support assembly of the spot welding device for the square shell of the fuel tank;

[0040] Figure 5 It shows Figure 3 A schematic diagram of the first rolling unit of the spot welding device for the square shell of the oil tank;

[0041] Figure 6 It shows Figure 4 A schematic diagram of the second rolling unit of the spot welding device for the square shell of the oil tank;

[0042] Figure 7 A cross-sectional view of the fuel tank's square shell and partition assembly is shown;

[0043] Figure 8 A simplified schematic diagram shows the square casing of the fuel tank rotating about the axis of the second roller;

[0044] Figure 9 A simplified schematic diagram is shown, illustrating how the square shell of the fuel tank moves first along the second horizontal direction and then rotates around the axis of the second roller.

[0045] Figure 10 A flowchart of the spot welding method for the square shell of the fuel tank in Embodiment 2 is shown.

[0046] Reference numerals: First support assembly 10; First support unit 11; First support part 111; Movable part 112; Connecting rod 113; Connecting part 114; First rolling unit 12; First roller 121; Second roller 122; Second support assembly 20; Second support unit 21; Second support part 211; Shaft module 212; Second rolling unit 22; Third roller 221; Bracket module 222; Electrode assembly 30; First electrode unit 31; Second electrode unit 32; Lifting assembly 40; Oil tank square shell 50; Partition sub-assembly 60; First spacing L1; Second spacing L2. Detailed Implementation

[0047] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0048] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0049] Because the square shell 50 of the fuel tank is heavy, it is necessary to maintain the square shell 50 of the fuel tank at a specific working height during the spot welding operation and to flip it between different welding surfaces. It is difficult to stably support the shell and maintain the specified welding height by relying solely on manual labor. The flipping operation is also very laborious, resulting in low operational convenience and low processing efficiency of the spot welding process.

[0050] Example 1:

[0051] In this embodiment, a spot welding device is provided for a square tank shell 50, which is cylindrical with a square cross-section. Figure 1 , Figure 2 As shown, the spot welding device includes a first support assembly 10, a second support assembly 20, and an electrode assembly 30.

[0052] like Figure 3As shown, the first support assembly 10 includes a first rolling unit 12 and a first support unit 11. The first rolling unit 12 is rotatably connected to the first support unit 11, and the rotation axis of the first rolling unit 12 extends along a first horizontal direction.

[0053] like Figure 4 As shown, the second support assembly 20 and the first support assembly 10 are spaced apart along a first horizontal direction. The second support assembly 20 includes a second rolling unit 22 and a second support unit 21. The second support unit 21 is rotatably connected to the second rolling unit 22, and the rotation axis of the second rolling unit 22 extends along the first horizontal direction.

[0054] By forming support limits from both ends of the square tank shell 50 with the first support component 10 and the second support component 20 respectively, the two ends of the square tank shell 50 are placed on the two sets of support components, so as to achieve stable support of the square tank shell 50 to maintain the specified welding height, thereby improving the convenience of operation and processing efficiency of the spot welding process of the square tank shell 50.

[0055] Electrode assembly 30 is located between first support assembly 10 and second support assembly 20. Electrode assembly 30 includes first electrode unit 31 and second electrode unit 32. First electrode unit 31 and second electrode unit 32 are arranged vertically at intervals, and the height difference between first electrode unit 31 and second electrode unit 32 is adjustable. By spot welding the abutment area between the partition sub-assembly 60 and the square shell 50 of the fuel tank through first electrode unit 31 and second electrode unit 32, point-by-point welding of the abutment area extending circumferentially is achieved, thereby meeting the processing requirements of multi-point spot welding connection between partition sub-assembly 60 and square shell 50 of fuel tank.

[0056] When the spot welding device is in operation, the inner peripheral wall of the square tank shell 50 abuts against the first rolling unit 12 and the second rolling unit 22 under the action of gravity. The square tank shell 50 is moved along the second horizontal direction for spot welding, and rotated to change the welding surface. The second horizontal direction is perpendicular to the first horizontal direction. It should be understood that the square tank shell 50 presses against the first rolling unit 12 and the second rolling unit 22 under its own weight, and the rolling of the first rolling unit 12 and the second rolling unit 22 achieves the dragging and rotation of the square tank shell 50. That is, the movement and spot welding of the square tank shell 50 along the second horizontal direction, and the rotation of the square tank shell 50, are both accomplished by the rolling cooperation of the first rolling unit 12 and the second rolling unit 22, resulting in a lower external force required for the operator to flip the square tank shell 50.

[0057] In this embodiment, the first support component 10 and the second support component 20 form support and limit at both ends of the square shell 50 of the fuel tank, thereby maintaining the specified welding height of the square shell 50 and improving the convenience and efficiency of the spot welding process. The inner circumferential wall of the square shell 50 abuts against the first rolling unit 12 and the second rolling unit 22 under gravity, allowing the dragging of the square shell 50 along the second horizontal direction and the rotational movement of the welding surface to be achieved by the rolling of the first rolling unit 12 and the second rolling unit 22, thus reducing the driving force required for flipping. The electrode component 30 allows spot welding to be applied to the upper abutment area during the stationary gap when the square shell 50 moves along the second horizontal direction, achieving continuous point-to-point welding of the abutment area extending circumferentially, thereby meeting the processing requirements for multi-point spot welding connection between the partition sub-assembly 60 and the square shell 50 of the fuel tank.

[0058] In other embodiments, the first support unit 11 includes a first support portion 111, a movable portion 112, a connecting portion 114, and a connecting rod 113; the movable portion 112 and the connecting rod 113 are respectively connected to the first support portion 111; the movable portion 112 is connected to the first electrode unit 31; the connecting rod 113 is connected to the second electrode unit 32; the movable portion 112 and the connecting rod 113 are arranged vertically at intervals. By having the movable portion 112 and the connecting rod 113 respectively support the first electrode unit 31 and the second electrode unit 32 and arranged vertically at intervals, the height difference between the first electrode unit 31 and the second electrode unit 32 can be adjusted, which is convenient for adapting to the spot welding requirements of different specifications of the square shell 50 of the oil tank. The connecting portion 114 is used to connect and support the first rolling unit 12.

[0059] The spot welding device also includes a lifting assembly 40, which is arranged between the first support assembly 10 and the second support assembly 20. The lifting assembly 40 supports the square tank shell 50 and its height is adjustable. The lifting assembly 40 raises the square tank shell 50 to provide auxiliary support for manual positioning and places one side wall of the square tank shell 50 in the area between the first electrode unit 31 and the second electrode unit 32. After the square tank shell 50 is raised and positioned, the lifting assembly 40 falls back down, allowing it to simultaneously abut against the first rolling unit 12 and the second rolling unit 22 by gravity. This avoids over-positioning of the square tank shell 50 and also provides clearance for the rotation of the square tank shell 50, ensuring the continuity of the spot welding process. Therefore, this embodiment further improves the convenience of material loading and positioning by using the lifting assembly 40 to assist in lifting and positioning.

[0060] Furthermore, such as Figure 3 , Figure 5As shown, the first rolling unit 12 includes a first roller 121 and a second roller 122 located at the same height. During the rotation of the square tank shell 50, along the first horizontal direction, the distance between the first roller 121 and the second rolling unit 22 is greater than the distance between the second roller 122 and the second rolling unit 22. That is, the first roller 121 and the second roller 122 are arranged back and forth along the first horizontal direction to jointly support the square tank shell 50, and avoid collisions by adjusting the contact state of the first roller 121 when rotating the square tank shell 50, thereby improving the convenience of rotating the square tank shell 50.

[0061] When the spot welding device is in operation, the square shell 50 of the oil tank moves along the second horizontal direction while simultaneously abutting against the first roller 121 and the second roller 122. During the rotation of the square shell 50 of the oil tank, it is spaced apart from the first roller 121 along the first horizontal direction, while the square shell 50 of the oil tank abuts against the second roller 122.

[0062] It should be understood that by having the first roller 121 and the second roller 122 arranged in front and behind to provide joint support, stable support for the square shell 50 of the oil tank is achieved during the spot welding movement stage, thus ensuring the stability of the spot welding operation of the electrode assembly 30. Furthermore, since the square shell 50 of the oil tank is first spaced apart from the first roller 121 in the first horizontal direction during the rotation process, and only the second roller 122 is in contact, the positional influence of the first roller 121 during the rotation of the square shell 50 of the oil tank is eliminated, thereby reducing the driving load required for the rotation of the square shell 50 of the oil tank.

[0063] Furthermore, such as Figure 6 As shown, the second rolling unit 22 includes a support module 222 and a plurality of third rollers 221. The third rollers 221 are rotatably connected to the support module 222, and the support module 222 is rotatably connected to the second support unit 21 about a first axis. The axes of the third rollers 221 and the first axis both extend along a first horizontal direction. The first axis and the axes of the third rollers 221 are parallel and spaced apart, and the plurality of third rollers 221 are rotationally symmetrically distributed about the first axis. The first axis coincides with the axis of the second roller 122.

[0064] It should be understood that the third roller 221 can revolve around the first axis with the support module 222, and each third roller 221 can rotate on its own axis. Multiple third rollers 221 are used to increase the support points of the fuel tank square shell 50, improve the stability of the fuel tank square shell 50 placed on the third rollers 221, and avoid interference from adjacent third rollers 221 when the fuel tank square shell 50 rotates. Simultaneously, by coordinating revolution and rotation during the rotation of the fuel tank square shell 50, rotational interference from adjacent third rollers 221 is avoided, thereby reducing the driving torque required for the rotation of the fuel tank square shell 50.

[0065] In some embodiments, the second support unit 21 includes a second support portion 211 and a shaft module 212; one end of the shaft module 212 is connected to the second support portion 211, and the other end is rotatably connected to the bracket module 222, for supporting the bracket module 222 and realizing its rotation around the first axis.

[0066] Furthermore, in the first horizontal direction, the distance between the electrode assembly 30 and the first rolling unit 12 is smaller than the distance between the electrode assembly 30 and the second rolling unit 22.

[0067] It should be understood that by placing the first rolling unit 12 closer to the electrode assembly 30 than the second rolling unit 22, the structural complexity of the electrode assembly 30 is reduced, eliminating the need for a clearance structure and thus lowering equipment manufacturing costs. Simultaneously, the second rolling unit 22, which combines rotation and revolution functions, has superior structural rigidity compared to the first rolling unit 12, which can only rotate. Positioning it away from the electrode assembly 30 provides more stable support for the square shell 50 of the oil tank during spot welding operations.

[0068] Furthermore, such as Figure 5 , Figure 6 As shown, the axial distance between two adjacent third rollers 221 is the first distance L1. The axial distance between the first roller 121 and the second roller 122 along the second horizontal direction is the second distance L2. The second distance L2 is smaller than the first distance L1.

[0069] It should be understood that by making the second spacing L2 smaller than the first spacing L1, the square shell 50 of the fuel tank achieves a wider support span, thereby improving the overall stability of the spot welding operation. Because the distance between the third roller 221 and the electrode assembly 30 is correspondingly larger, even if the square shell 50 of the fuel tank near the third roller 221 slightly tilts during the spot welding process, it can still continuously adhere to and abut against the electrode assembly 30, thus the welding quality is less likely to be affected.

[0070] Furthermore, the position of the first roller 121 along the first horizontal direction is adjustable. It should be understood that the support and positioning of the square tank shell 50 can be achieved simply by driving the first roller 121 to translate along the first horizontal direction, eliminating the need to drag the relatively heavy square tank shell 50 into position. Moreover, when the square tank shell 50 needs to rotate, the first roller 121 can be moved away along the first horizontal direction to maintain a gap with the square tank shell 50. After rotation is complete, the first roller 121 can be reset and placed against the inner circumferential wall of the square tank shell 50. The adjustable position of the roller achieves rotational support, thereby avoiding rotational interference and improving the ease of spot welding.

[0071] Furthermore, in the second horizontal direction, the distance between the first roller 121 and the electrode assembly 30 is greater than the distance between the second roller 122 and the electrode assembly 30. It should be understood that since the position of the first roller 121 is adjustable along the first horizontal direction, and the distance between the first roller 121 and the electrode assembly 30 is greater than the distance between the second roller 122 and the electrode assembly 30 in the second horizontal direction, the first roller 121, while having an adjustable function, has relatively insufficient support stability. The second roller 122 can provide stable support to the electrode assembly 30 during welding operations to ensure reliable spot welding quality. By making the distance between the second roller 122 and the electrode assembly 30 smaller than the distance between the first roller 121 and the electrode assembly 30, i.e., shortening the distance between the electrode assembly 30 and the second roller 122, the overall support stability is further improved.

[0072] Example 2:

[0073] In this embodiment, a spot welding method for a square tank shell 50 is provided. The spot welding method is applied to a spot welding device for the square tank shell 50, such as... Figure 10 As shown, the spot welding method includes steps S10 to S50. The spot welding method executes steps S10, S20, S30, S40, and S50 sequentially.

[0074] Step S10: Insert the partition assembly 60 into the inner cavity of the square housing 50 of the fuel tank, so that the outer peripheral wall of the partition assembly 60 abuts against the inner peripheral wall of the square housing 50 of the fuel tank; wherein, the abutment area extends circumferentially along the square housing 50 of the fuel tank, and the abutment area on the upper side extends along the second horizontal direction. Figure 7 As shown, the outer peripheral wall of the partition assembly 60 abuts against the inner peripheral wall of the square housing 50 of the fuel tank.

[0075] Step S20: The upper inner peripheral wall of the square shell 50 of the oil tank abuts against the first rolling unit 12 and the second rolling unit 22 respectively; wherein the first rolling unit 12 and the second rolling unit 22 are spaced apart from the abutment area.

[0076] Step S30: The square shell 50 of the oil tank is moved intermittently along the second horizontal direction. During the static gap, the upper contact area is spot welded by the first electrode unit 31 and the second electrode unit 32.

[0077] Step S40: Based on the completion of spot welding of the upper abutment area, control the rotation of the square shell 50 of the oil tank so that the other side of the square shell 50 of the oil tank faces upward.

[0078] Step S50: Return to step S30 and repeat until spot welding of the contact area is completed.

[0079] In this embodiment, the two ends of the square shell 50 of the oil tank are supported by the first rolling unit 12 and the second rolling unit 22. The upper abutment area is welded point by point by intermittent movement combined with static spot welding. Then, the rotation of the square shell 50 of the oil tank is completed by the rolling unit. While reducing the reliance on manual stable support to maintain the specified welding height and flipping of the square shell 50 of the oil tank, the abutment area extending along the circumference is welded cyclically surface by surface, thereby improving the convenience of spot welding operation and processing efficiency.

[0080] In other embodiments, the spot welding method further includes supporting and lifting the square tank shell 50 by a lifting assembly 40 before the upper inner peripheral wall of the square tank shell 50 abuts against the first rolling unit 12 and the second rolling unit 22, so that it simultaneously abuts against the first rolling unit 12 and the second rolling unit 22. After the lifting and positioning is completed, the lifting assembly 40 falls back down to avoid motion interference with the rotation of the square tank shell 50.

[0081] Further, step S40 includes steps S41 to S43. The spot welding method executes steps S10, S20, S30, S41, S42, S43, and S50 in sequence.

[0082] Step S41: Control the first roller 121 and the square shell 50 of the oil tank to be spaced apart along the first horizontal direction. By removing the first roller 121 first in the rotation process to eliminate its rotational interference, the square shell 50 of the oil tank is supported and driven to rotate by the second roller 122 alone, so as to avoid mutual interference between the two rollers and reduce rotational resistance during the rotation of the square shell 50 of the oil tank.

[0083] Step S42: Control the square shell 50 of the oil tank to connect with the second roller 122 and rotate around the axis of the second roller 122.

[0084] In step S43, after the square housing 50 of the fuel tank has rotated, the first roller 121 is controlled to abut against the square housing 50. After the square housing 50 of the fuel tank has rotated to its position, the first roller 121 is reset and abuts against the square housing 50. By restoring the joint support of the first roller 121 and the second roller 122, the support effect on the square housing 50 of the fuel tank is strengthened and its rotation is reliably driven, thereby achieving the effect of smoothly completing the rotation and stable support of the square housing 50 of the fuel tank.

[0085] Furthermore, step S41 includes step S411. Step S411 is a further optimization of step S41.

[0086] Step S411: Adjust the position of the first roller 121 along the first horizontal direction until the first roller 121 and the square tank shell 50 are spaced apart along the first horizontal direction. By moving only the first roller 121 instead of dragging the square tank shell 50 to create the gap, interference between the square tank shell 50 and the first roller 121 during rotation is avoided. At the same time, it eliminates the need to drag the heavy square tank shell 50, thereby improving the overall ease of spot welding.

[0087] Furthermore, step S41 includes step S412. Step S412 is a further optimization of step S41. Steps S411 and S412 are two different implementations; either one can be selected for execution when performing the spot welding method.

[0088] In step S412, the square housing 50 of the fuel tank is moved along the first horizontal direction until the first roller 121 and the square housing 50 of the fuel tank are spaced apart along the first horizontal direction. Alternatively, by moving the square housing 50 of the fuel tank, the first roller 121 and the square housing 50 are spaced apart along the first horizontal direction, thus releasing the contact between the first roller 121 and the square housing 50 of the fuel tank before rotation, thereby avoiding rotational interference.

[0089] Furthermore, such as Figure 8 As shown, during the rotation of the square tank shell 50 around the axis of the second roller 122, the upper contact area away from the second roller 122 swings downward. The first roller 121 has a position adjustment function but weak support stability, while the second roller 122 remains fixed in position at all times, providing high support stability. This ensures that the second roller 122 is always in contact with the inner wall of the square tank shell 50 for support. By controlling the rotation of the square tank shell 50 around the second roller 122, with the rotation direction causing the upper contact area to swing downward, no relative sliding or large-distance relative sliding occurs between the first roller 121 and the square tank shell 50 during the swinging process. This allows the square tank shell 50 to rotate quickly, smoothly, and stably, facilitating the rapid commencement of subsequent spot welding operations. At the same time, the second roller 122 is positioned closer to the corner of the square shell 50 of the fuel tank. This corner is the center of gravity of the square shell 50 when it is bent by force. Rotating around this fulcrum results in a larger lever arm generated by the overall weight of the square shell 50 of the fuel tank and a larger auxiliary turning torque brought by gravity. The external force required for the operator to turn the square shell 50 of the fuel tank is lower, which greatly reduces the intensity of the operation of turning the square shell 50 of the fuel tank and makes the turning process easier and smoother.

[0090] For ease of understanding, such as Figure 9 As shown, if the square shell 50 of the oil tank is rotated in the opposite direction, the workpiece needs to slide along the upper contact surface first, and then rotate around the other side corner to complete the flipping. The sliding stroke is longer, and the work efficiency is significantly reduced.

[0091] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A spot welding device for a square shell of an oil tank, characterized in that, The square shell of the fuel tank is cylindrical with a square cross-section; The spot welding device includes: The first support assembly includes a first rolling unit and a first support unit; the first rolling unit is rotatably connected to the first support unit; the rotation axis of the first rolling unit extends along a first horizontal direction. A second support component is provided at a distance from the first support component along the first horizontal direction; the second support component includes a second rolling unit and a second support unit; the second support unit is rotatably connected to the second rolling unit; the rotation axis of the second rolling unit extends along the first horizontal direction. An electrode assembly is located between a first support assembly and a second support assembly; the electrode assembly includes a first electrode unit and a second electrode unit; the first electrode unit and the second electrode unit are vertically spaced apart; the height difference between the first electrode unit and the second electrode unit is adjustable; When the spot welding device is in operation, the inner peripheral wall of the square shell of the oil tank abuts against the first rolling unit and the second rolling unit respectively under the action of gravity; the square shell of the oil tank is moved along the second horizontal direction to perform spot welding, and the square shell of the oil tank is rotated to change the welding surface; wherein, the second horizontal direction is perpendicular to the first horizontal direction.

2. The spot welding device for a square shell of an oil tank according to claim 1, characterized in that, The first rolling unit includes a first roller and a second roller located at the same height; during the rotation of the square shell of the oil tank, along the first horizontal direction, the distance between the first roller and the second rolling unit is greater than the distance between the second roller and the second rolling unit. When the spot welding device is in operation, the square shell of the oil tank moves along the second horizontal direction and simultaneously abuts against the first roller and the second roller; when the square shell of the oil tank rotates, it is spaced apart from the first roller along the first horizontal direction, and the square shell of the oil tank abuts against the second roller.

3. The spot welding device for a square shell of an oil tank according to claim 2, characterized in that, The second rolling unit includes a support module and a plurality of third rollers; the third rollers are rotatably connected to the support module; the support module is rotatably connected to the second support unit around a first axis; the axis of the third rollers and the first axis both extend along the first horizontal direction; the first axis and the axis of the third rollers are parallel and spaced apart; the plurality of third rollers are rotationally symmetrically distributed about the first axis; the first axis coincides with the axis of the second rollers.

4. The spot welding device for a square shell of an oil tank according to claim 3, characterized in that, In the first horizontal direction, the distance between the electrode assembly and the first rolling unit is smaller than the distance between the electrode assembly and the second rolling unit.

5. The spot welding device for a square shell of an oil tank according to claim 4, characterized in that, The axial distance between two adjacent third rollers is the first distance; The axial distance between the first roller and the second roller along the second horizontal direction is the second distance; the second distance is less than the first distance.

6. The spot welding device for a square shell of an oil tank according to claim 2, characterized in that, The position of the first roller along the first horizontal direction is adjustable.

7. The spot welding device for a square shell of an oil tank according to claim 6, characterized in that, In the second horizontal direction, the distance between the first roller and the electrode assembly is greater than the distance between the second roller and the electrode assembly.

8. A spot welding method for a square shell of a fuel tank, characterized in that, The spot welding method is applied to the spot welding apparatus for the square shell of the oil tank according to any one of claims 1 to 7, and the spot welding method includes: The partition assembly is placed inside the square shell of the fuel tank, so that the outer peripheral wall of the partition assembly abuts against the inner peripheral wall of the square shell of the fuel tank; wherein the abutting area extends along the circumference of the square shell of the fuel tank, and the abutting area on the upper side extends along the second horizontal direction. The upper inner peripheral wall of the square shell of the oil tank abuts against the first rolling unit and the second rolling unit respectively; wherein the first rolling unit and the second rolling unit are spaced apart from the abutment area. The square shell of the oil tank is moved intermittently along the second horizontal direction. During the static gap, the upper abutment area is spot welded through the first electrode unit and the second electrode unit. Once the spot welding of the abutment area on the upper side is completed, control the rotation of the square shell of the oil tank so that the other side of the square shell of the oil tank faces upward. Returning to the process of intermittently moving the square shell of the oil tank along the second horizontal direction, spot welding the upper contact area through the first electrode unit and the second electrode unit during the static gap, and repeating the process until the spot welding of the contact area is completed.

9. The spot welding method for a square shell of an oil tank according to claim 8, characterized in that, After the spot welding of the abutment area on the upper side is completed, the square shell of the oil tank is rotated so that the other side of the square shell of the oil tank faces upward, including: The first roller is positioned at a distance from the square shell of the oil tank along the first horizontal direction. The square shell of the oil tank is controlled to overlap with the second roller and rotate around the axis of the second roller; After the square shell of the oil tank has rotated, the first roller is controlled to abut against the square shell of the oil tank.

10. The spot welding method for a square shell of an oil tank according to claim 9, characterized in that, The control first roller and the square shell of the oil tank are spaced apart along the first horizontal direction, including: Adjust the position of the first roller along the first horizontal direction until the first roller and the square shell of the oil tank are spaced apart along the first horizontal direction.

11. The spot welding method for a square shell of an oil tank according to claim 9, characterized in that, The control first roller and the square shell of the oil tank are spaced apart along the first horizontal direction, including: The square shell of the oil tank is moved along the first horizontal direction until the first roller and the square shell of the oil tank are spaced apart along the first horizontal direction.

12. The spot welding method for a square shell of an oil tank according to claim 9, characterized in that, As the square shell of the oil tank rotates around the axis of the second roller, the end of the upper contact area away from the second roller swings downward.

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