Automobile aluminum alloy auxiliary frame welding equipment and using method thereof

Abstract

The invention discloses automobile aluminum alloy auxiliary frame welding equipment and a using method thereof, and belongs to the technical field of automobile frame welding, the automobile aluminum alloy auxiliary frame welding equipment comprises a workbench, driving mechanisms are arranged at the two ends of the workbench, each driving mechanism comprises an arc-shaped plate, a supporting block is installed at the end of each arc-shaped plate, and a frame body is placed on the supporting blocks; a positioning rod is fixedly connected to the supporting block, a welding mechanism is arranged on the mounting base, the multi-axis mechanical arm is fixedly mounted on the mounting base, and an electric arc welding gun is mounted at one end of the multi-axis mechanical arm. The driving mechanism is arranged to drive the positioning rod to fix the frame body from the inside, multi-point fixing can be rapidly achieved, the stability of the frame body in the welding process is improved, the welding mechanism can be rapidly brought to the position near a welding point, the follow-up adjustment time for the position of the welding mechanism is saved, and the welding efficiency is improved. The welding mechanism can be quickly put into work, multi-point synchronous welding is achieved, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile frame welding, and particularly relates to an automobile aluminum alloy subframe welding device and a using method thereof. Background Art

[0002] An automobile aluminum alloy subframe is an important component in the automobile chassis system, usually made of aluminum alloy material. It is a frame-like structure, generally composed of multiple aluminum alloy components combined by welding, bolt connection, etc. During the automobile manufacturing process, an arc welding device is often used to weld and process the automobile aluminum alloy subframe. An arc welding device is a device that uses the heat generated by arc discharge to melt metal, thereby realizing metal connection. Its working principle is to generate an arc between the electrode (or welding wire) and the workpiece through a welding power source. When the arc discharges, a large amount of heat is released, causing the electrode (or welding wire) and the local area of the workpiece to melt rapidly, forming a molten pool. As the arc moves, the molten pool cools and solidifies to form a weld seam, connecting the workpieces together.

[0003] In the prior art, the patent with the publication number of CN213257615U discloses a frame welding device, which includes two external shaft components and a welding robot. The external shaft component includes a rotation driving part and an external rotating shaft. The rotation driving part is connected to the external rotating shaft and drives the external rotating shaft to rotate. At least one positioning part for fixing a welding jig is arranged on each external rotating shaft. The welding jig is used to fix the workpiece to be welded. The external rotating shafts of the two external shaft components are arranged opposite to each other at a certain distance. The welding robot is arranged between the two external rotating shafts and can perform welding operations on the workpieces to be welded on the two external rotating shafts.

[0004] The problems existing in the prior art are: the installation position of the welding robot is fixed. Although its robotic arm can move freely, the distance between it and the workpiece to be welded is relatively far. It takes a certain amount of time to adjust the robotic arm to position the welding device to the welding part. After welding one part, the position needs to be adjusted to the next welding part. The entire welding process takes a long time and has low efficiency. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention provides an automobile aluminum alloy subframe welding device and a using method thereof, which have the advantages of quickly adjusting the position of the arc welding gun and realizing multi-point synchronous welding, and solve the problems that the existing welding robot has a fixed installation position, takes a long time to adjust the position of the welding device, and has low efficiency.

[0006] The present invention is implemented as follows. An aluminum alloy subframe welding device for an automobile includes a workbench. Driving mechanisms are provided at both ends of the workbench. The driving mechanism includes an arc-shaped plate. A support block is installed at the end of the arc-shaped plate. A frame body is placed on the support block. A positioning rod is fixedly connected to the support block and abuts against the inside of the frame body. An installation seat is fixedly installed at the upper end of the positioning rod. A welding mechanism is provided on the installation seat. The welding mechanism includes a multi-axis robotic arm. The multi-axis robotic arm is fixedly installed on the installation seat. An arc welding gun is installed at one end of the multi-axis robotic arm.

[0007] Preferably, an installation frame is fixedly installed at the end of the multi-axis robotic arm. The arc welding gun is fixedly installed on the installation frame. A laser scanner is also fixedly installed on the installation frame.

[0008] Preferably, a fixed plate is fixedly installed on the lower surface of the workbench. An electric push rod is fixedly installed on the fixed plate. The output end of the electric push rod is fixedly connected to a connecting plate.

[0009] Preferably, a guide rail is fixedly installed on the upper surface of the workbench. A double-sided rack is slidably connected to the guide rail. The upper end of the connecting plate is fixedly connected to both sides of the lower surface of the double-sided rack.

[0010] Preferably, gears are meshed and connected to both sides of the double-sided rack. The gears are fixedly installed at the end of the arc-shaped plate away from the support block. Both the gear and the arc-shaped plate are rotatably installed on the workbench through connecting pieces.

[0011] Preferably, the connecting piece is set as a fixed shaft. The fixed shaft is fixedly connected to the upper surface of the 1. Both the gear and the arc-shaped plate are rotatably connected to the fixed shaft.

[0012] Preferably, a first through hole and a second through hole that are aligned are formed on the gear and the arc-shaped plate. A plurality of equally spaced installation holes arranged side by side are formed on the workbench. The first through hole and the second through hole can be aligned with any group of installation holes. The connecting piece includes two limiting shafts and a locking piece for locking the double-sided rack and the gear. The two limiting shafts are inserted into the corresponding first through hole, second through hole, and installation hole.

[0013] Preferably, in the present invention, the locking member includes a round rod fixedly connected to the upper ends of the two limiting shafts. A collar is rotatably sleeved on the round rod. A first connecting frame is fixedly connected to the lower end of the collar. A roller body is rotatably connected to the first connecting frame. A plurality of annular and equidistant magnetic attraction strips are provided on the outer surface of the roller body, and the magnetic attraction strips can be attracted to the upper surface of the double-sided rack; A second connecting frame is fixedly connected to the upper end of the collar. The height dimension of the second connecting frame is greater than that of the first connecting frame. A clamping block is fixedly connected to the end of the second connecting frame away from the round rod. A plurality of equidistant card slots are provided on the upper surface of the double-sided rack, and the clamping block can be inserted into the card slots.

[0014] Preferably, in the present invention, a fixed block is fixedly installed inside the support block, and a material supporting frame is rotatably installed on the fixed block; The upper surface of the material supporting frame is higher than the upper surface of the support block, and the upper surface of the material supporting frame is attached to the bottom of the vehicle frame body.

[0015] A usage method of an automobile aluminum alloy subframe welding device, applicable to an automobile aluminum alloy subframe welding device, includes the following steps:

[0016] Set the vehicle frame body on the four positioning rods so that its lower surface is placed on the material supporting frame;

[0017] Subsequently, start the electric push rod to drive the connecting plate to move. The connecting plate drives the double-sided rack to move towards the vehicle frame body. The gear drives the arc-shaped plate to gradually open outwards until the positioning rod abuts against the inner wall of the vehicle frame body. The multi-axis robotic arm moves synchronously with the positioning rod to be fixed near the vehicle frame body. The welding part of the vehicle frame body is scanned by a laser scanner;

[0018] Adjust the welding parameters and path of the arc welding torch according to the scanning results. Finally, drive the arc welding torch to move for welding through the multi-axis robotic arm, and weld multiple parts simultaneously.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. In the present invention, by setting a driving mechanism to drive the positioning rods to fix the vehicle frame body from the inside, multi-point fixation can be quickly achieved, improving the stability during the welding process of the vehicle frame body. Moreover, the welding mechanism can be quickly brought to the vicinity of the welding point, saving the subsequent adjustment time of the position of the welding mechanism, enabling the welding mechanism to quickly enter the work, realizing multi-point synchronous welding, and improving the work efficiency.

[0021] 2. In the present invention, by setting a rotatable material supporting frame on the support block, the material supporting frame can be rotated and adjusted according to the inclination angle of the lower surface of the vehicle frame body to ensure fitting with the lower surface of the vehicle frame body, increasing the contact area to improve the stability of the support. Description of the Drawings

[0022] Figure 1 It is a schematic three-dimensional structure diagram of the whole of Embodiment 1 of the present invention;

[0023] Figure 2 It is a schematic three-dimensional structure diagram of the welding mechanism of Embodiment 1 of the present invention;

[0024] Figure 3 It is a schematic three-dimensional structure diagram of the driving mechanism of Embodiment 1 of the present invention;

[0025] Figure 4 It is a schematic three-dimensional structure diagram of the positioning rod and support block part of Embodiment 1 of the present invention;

[0026] Figure 5 It is a schematic three-dimensional structure diagram of the partial cross-section of the support block of Embodiment 1 of the present invention;

[0027] Figure 6 It is an exploded view of the structure of the support block part of Embodiment 1 of the present invention;

[0028] Figure 7 It is a schematic top view structure diagram of the whole of Embodiment 2 of the present invention;

[0029] Figure 8 For Embodiment 2 of the present invention Figure 7 The schematic cross-sectional structure diagram of the A-A part;

[0030] Figure 9 For Embodiment 2 of the present invention Figure 8 The enlarged structure diagram of part B;

[0031] Figure 10 For Embodiment 2 of the present invention Figure 9 The enlarged structure diagram of part C;

[0032] Figure 11 For Embodiment 2 of the present invention Figure 9 The enlarged structure diagram of part D.

[0033] In the figure: 1, workbench; 2, driving mechanism; 21, fixed plate; 22, electric push rod; 23, connecting plate; 24, guide rail; 25, double-sided rack; 26, gear; 27, arc-shaped plate; 3, welding mechanism; 31, multi-axis robotic arm; 32, mounting bracket; 33, arc welding gun; 34, laser scanner; 4, positioning rod; 41, mounting seat; 5, vehicle frame body; 6, support block; 61, material support frame; 62, fixed block; 261, first through hole; 271, second through hole; 7, mounting hole; 8, limiting shaft; 251, card slot; 9, round rod; 10, collar; 11, first connecting frame; 12, roller body; 13, magnetic strip; 14, second connecting frame; 15, block. Detailed implementation manners

[0034] To further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail in conjunction with the accompanying drawings as follows.

[0035] The structure of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Embodiment 1

[0037] As Figures 1 to 6 shown, an aluminum alloy subframe welding device for an automobile provided by an embodiment of the present invention includes a workbench 1. Driving mechanisms 2 are arranged at both ends of the workbench 1. The driving mechanism 2 includes an arc-shaped plate 27. A support block 6 is installed at the end of the arc-shaped plate 27. A frame body 5 is placed on the support block 6. A positioning rod 4 is fixedly connected to the support block 6. The positioning rod 4 abuts against the inside of the frame body 5. An installation seat 41 is fixedly installed at the upper end of the positioning rod 4. A welding mechanism 3 is arranged on the installation seat 41. The welding mechanism 3 includes a multi-axis robotic arm 31. The multi-axis robotic arm 31 is fixedly installed on the installation seat 41. An arc welding gun 33 is installed at one end of the multi-axis robotic arm 31.

[0038] Four positioning rods 4 are provided, which are respectively located at the four corners inside the frame body 5. The driving mechanism 2 drives the positioning rods 4 at both ends to expand outwards, fixing the frame body 5 from the inside. The support block 6 supports the frame body 5 from the bottom. A welding mechanism 3 is installed at the upper end of each positioning rod 4. The welding mechanism 3 moves synchronously with the positioning rod 4 and gradually approaches the subframe body, facilitating subsequent welding work.

[0039] An installation frame 32 is fixedly installed at the end of the multi-axis robotic arm 31. The arc welding gun 33 is fixedly installed on the installation frame 32. A laser scanner 34 is also fixedly installed on the installation frame 32.

[0040] The laser scanner 34 and the arc welding gun 33 are installed on the installation frame 32 together. As the multi-axis robotic arm 31 moves, the laser scanner 34 can scan the welding part of the frame body 5 to obtain three-dimensional information of the welding part, and adjust the welding parameters and path of the arc welding gun 33 according to the scanning results, further improving the welding quality and reducing welding defects.

[0041] A fixing plate 21 is fixedly installed on the lower surface of the workbench 1. An electric push rod 22 is fixedly installed on the fixing plate 21. The output end of the electric push rod 22 is fixedly connected to a connecting plate 23. A guide rail 24 is fixedly installed on the upper surface of the workbench 1. A double-sided rack 25 is slidably connected to the guide rail 24. The upper end of the connecting plate 23 is fixedly connected to both sides of the lower surface of the double-sided rack 25. A gear 26 is meshed with both sides of the double-sided rack 25. The gear 26 is fixedly installed at one end of the arc-shaped plate 27 away from the support block 6. One end of the gear 26 and the arc-shaped plate 27 are both rotatably installed on the workbench 1 through connecting pieces.

[0042] Driving mechanisms 2 are provided at both ends of the upper surface of the workbench 1. The specifications of the two driving mechanisms 2 are respectively adapted to the widths of both ends of the vehicle frame body 5. Each driving mechanism 2 includes two symmetrically arranged arc-shaped plates 27, and positioning rods 4 are installed on the arc-shaped plates 27. When the widths of both ends of the vehicle frame body 5 are different, the opening degrees of the positioning rods 4 connected to the two driving mechanisms 2 are also different. Through this setting, multi-point fixation of the vehicle frame body 5 can be achieved, the stability during the welding process of the vehicle frame body 5 can be improved, and the welding mechanism 3 can be quickly brought near the welding point, saving the subsequent adjustment time for the position of the welding mechanism 3, enabling the welding mechanism 3 to quickly be put into work, and improving the work efficiency.

[0043] During work, the electric push rod 22 is started to drive the connecting plate 23 to move. The connecting plate 23 drives the double-sided rack 25 to slide on the guide rail 24. Since the double-sided rack 25 meshes with the gears 26 on both sides, the sliding of the double-sided rack 25 will cause the gears 26 to rotate, and then drive the arc-shaped plates 27 to rotate around their rotation installation points, so that the two positioning rods 4 open outwards simultaneously until the vehicle frame body 5 is tightly pressed and fixed from the inside. Specifically, the connecting member can be implemented in the following manner: the connecting member is set as a fixed shaft, the fixed shaft is fixedly connected to the upper surface of the 1, and the gears 26 and the arc-shaped plates 27 are both rotatably connected to the fixed shaft.

[0044] A fixing block 62 is fixedly installed inside the support block 6. A material supporting frame 61 is rotatably installed on the fixing block 62. The upper surface of the material supporting frame 61 is higher than the upper surface of the support block 6, and the upper surface of the material supporting frame 61 is attached to the bottom of the vehicle frame body 5.

[0045] The middle part of the material supporting frame 61 is rotatably connected to the upper end of the fixing block 62. The fixing block 62 supports the material supporting frame 61, and the material supporting frame 61 can rotate around the upper end of the fixing block 62. When the contact part between the vehicle frame body 5 and the material supporting frame 61 is an inclined surface, the material supporting frame 61 rotates correspondingly, so as to ensure that its upper surface is attached to the vehicle frame body 5. Compared with the traditional flat fixed material supporting platform, the contact area with the vehicle frame body 5 can be increased, thereby further improving the stability of the vehicle frame body 5.

[0046] Embodiment 2

[0047] The difference from Embodiment 1 is that the connecting member adopts the following scheme:

[0048] Refer to Figures 7 - 11The gear 26 and the arc plate 27 are provided with an aligned first through hole 261 and a second through hole 271, and the workbench 1 is provided with a plurality of equidistantly arranged mounting holes 7 in parallel, and the first through hole 261 and the second through hole 271 can be aligned with any group of mounting holes 7; the connecting member includes two limit shafts 8 and a locking member for locking the double-sided rack 25 and the gear 26; the two limit shafts 8 are inserted into the corresponding first through hole 261, the second through hole 271 and the mounting hole 7.

[0049] Through this setting, there are two ways of use: first, in normal use, the two limit shafts 8 are inserted into the corresponding first through hole 261, second through hole 271 and mounting hole 7, and the locking member does not lock the double-sided rack 25 and the gear 26. At this time, work can be carried out in the manner of Example 1, which will not be repeated here.

[0050] Second, the working position of the gear 26 and the arc plate 27 can be adjusted. The specific process is as follows: first, pull the limit shaft 8 upward to at least disengage it from the mounting hole 7; then lock the double-sided rack 25 and the gear 26 through the locking member, at which time the double-sided rack 25, the gear 26 and the arc plate 27 are connected as a whole; then, the double-sided rack 25, the gear 26 and the arc plate 27 are moved as a whole by the extension and contraction of the electric push rod 22, and after moving to the preset position, the limit shaft 8 is lowered and inserted into the mounting hole 7, and finally the locking member is released from the locking of the double-sided rack 25 and the gear 26. Through this setting, by adjusting the position of the double-sided rack 25 and the gear 26, it can be adapted to frames of other sizes, and the position of the welding mechanism 3 can also be adjusted at the same time, which increases the flexibility of the device. In addition, adjusting the position of the double-sided rack 25 and the gear 26 through the electric push rod 22 is more accurate and labor-saving.

[0051] Further, the locking member includes a round rod 9, the round rod 9 is fixedly connected to the upper ends of the two limit shafts 8, a collar 10 is rotatably sleeved on the round rod 9, a first connecting frame 11 is fixedly connected to the lower end of the collar 10, a roller body 12 is rotatably connected to the first connecting frame 11, and a plurality of annular equidistantly arranged magnetic strips 13 are provided on the outer surface of the roller body 12, and the magnetic strips 13 can be attracted to the upper surface of the double-sided rack 25;

[0052] The upper end of the ring 10 is fixedly connected to a second connecting frame 14, the height of the second connecting frame 14 is greater than the height of the first connecting frame 11, and the end of the second connecting frame 14 away from the round rod 9 is fixedly connected to a clamping block 15. The upper surface of the double-sided rack 25 is provided with a plurality of equidistantly arranged clamping grooves 251, and the clamping block 15 can be clamped into the clamping grooves 251.

[0053] In the specific setting, the length dimension of the roller body 12 and the magnetic strip 13 is larger than the dimension of the card slot 251, so as to prevent the magnetic strip 13 from being stuck in the card slot 251. When in use, in normal use, the two limit shafts 8 are inserted into the corresponding first through hole 261, the second through hole 271 and the mounting hole 7, and the magnetic strip 13 is attracted to the upper surface of the double-sided rack 25, and the double-sided rack 25 can slide normally. At this time, the roller body 12 rolls normally, and the upper surface of the magnetic strip 13 and the double-sided rack 25 are always attracted. Through this setting, the double-sided rack 25 has a downward suction force on the entire locking member, so that the limit shaft 8 can be limited to prevent the limit shaft 8 from moving upward by itself. It should be noted that, in general, we need to fix the limit shaft 8, for example, the limit shaft 8 is set in the form of a bolt, and the lower end is fixed by a nut. However, this method has many defects, such as being troublesome to operate, and if the nut is tightened, it will hinder the rotation of the gear 26 and the arc plate 27, and if it is not tightened, it may fall off. With this setting, a downward pulling force is generated on the limit shaft 8 by magnetic attraction, and the limit shaft 8 itself is also affected by gravity, so it can prevent the limit shaft 8 from moving upward by itself. In addition, when the position needs to be changed, the second connecting frame 14 can be pulled upward to disengage the magnetic strip 13 from the upper surface of the double-sided rack 25, and at the same time, the limit shaft 8 is disengaged from the mounting hole 7 but not from the first through hole 261. At this time, the second connecting frame 14 is rotated 180°, and the block 15 is inserted into the slot 251. At this time, the limit shaft 8 is still in a state of being disengaged from the mounting hole 7. In this case, the double-sided rack 25 and the gear 26 are locked, and the double-sided rack 25, the gear 26 and the arc plate 27 are connected as a whole; the double-sided rack 25, the gear 26 and the arc plate 27 are moved as a whole by the extension and retraction of the electric push rod 22. After moving to the preset position, the above process is reversed to make the limit shaft 8 descend and insert into the mounting hole 7, and at the same time release the lock of the double-sided rack 25 and the gear 26.

[0054] In summary, the locking member of this solution has the following functions:

[0055] First, during normal use, the limit shaft 8 can be limited to prevent it from moving upward by itself. When the position needs to be adjusted, there is no need to frequently disassemble and assemble the limit shaft 8. Second, the weight of the locking part is concentrated on the roller body 12, which can, conversely, press the double-sided rack 25 to make its movement smoother. Third, through this setting, the limit shaft 8 is not only used to limit the gear 26 and the arc plate 27, but also plays a key role in the action of "locking the double-sided rack 25 and the gear 26" and is part of the locking part. Without this setting, when the position needs to be adjusted, either the limit shaft 8 is completely pulled out (in which case the locking function cannot be achieved), or an additional limiting structure is required to limit the limit shaft 8 in the state of "detaching from the mounting hole 7 but not detaching from the first through hole 261". Fourth, the two actions of "moving the limit shaft 8 upward" and "locking the double-sided rack 25 and the gear 26" are combined, and the two actions of "moving the limit shaft 8 downward" and "releasing the lock of the double-sided rack 25 and the gear 26" are combined, making the operation more convenient.

[0056] Embodiment 3

[0057] A method for using an automobile aluminum alloy subframe welding device, applicable to an automobile aluminum alloy subframe welding device, includes the following steps:

[0058] Step S1, sleeving the frame body 5 on the four positioning rods 4, and placing its lower surface on the material support frame 61;

[0059] Step S2, by starting the electric push rod 22 to drive the connecting plate 23 to move, the connecting plate 23 drives the double-sided rack 25 to move towards the frame body 5. The gear 26 drives the arc plate 27 to rotate, so that the arc plate 27 gradually opens outwards until the positioning rod 4 abuts against the inner wall of the frame body 5. The multi-axis robotic arm 31 moves synchronously with the positioning rod 4 to be fixed near the frame body 5, and the welding part of the frame body 5 is scanned by the laser scanner 34;

[0060] Step S3, adjusting the welding parameters and path of the arc welding torch 33 according to the scanning results, and finally driving the arc welding torch 33 to move for welding by the multi-axis robotic arm 31, and welding multiple parts simultaneously.

[0061] The working principle of the present invention:

[0062] During use, the frame body 5 is sleeved on the four positioning rods 4, and its lower surface is placed on the material supporting frame 61. When the contact part between the frame body 5 and the material supporting frame 61 is an inclined surface, the material supporting frame 61 rotates correspondingly to ensure the fitting of the contact surface with the frame body 5, increasing the contact area to ensure the stability of the support for the frame body 5. Subsequently, the electric push rod 22 is started to drive the connecting plate 23 to move. The connecting plate 23 drives the double-sided rack 25 to move towards the frame body 5. The gear 26 drives the arc-shaped plate 27 to rotate, causing the arc-shaped plate 27 to gradually open outwards until the positioning rod 4 abuts against the inner wall of the frame body 5. The multi-axis robotic arm 31 moves synchronously with the positioning rod 4 to be fixed near the frame body 5. The welding part of the frame body 5 is scanned by the laser scanner 34, and the welding parameters and path of the arc welding torch 33 are adjusted according to the scanning results. Finally, the multi-axis robotic arm 31 drives the arc welding torch 33 to move for welding, and multiple parts are welded simultaneously to improve the welding efficiency.

[0063] To sum up: For this automotive aluminum alloy subframe welding device and its usage method, the driving mechanism 2 drives the positioning rods 4 to fix the frame body 5 from the inside, which can quickly achieve multi-point fixation, improve the stability during the welding process of the frame body 5, and can quickly bring the welding mechanism 3 near the welding point, saving the subsequent adjustment time for the position of the welding mechanism 3, enabling the welding mechanism 3 to quickly engage in work and improving work efficiency. By providing a rotatable material supporting frame 61 on the support block 6, the material supporting frame 61 can be rotationally adjusted according to the inclination angle of the lower surface of the frame body 5 to ensure the fitting of the lower surface of the frame body 5, increasing the contact area to improve the stability of the support.

[0064] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such process, method, article or device.

[0065] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automobile aluminum alloy subframe welding device, comprising a workbench (1), characterized in that: A driving mechanism (2) is provided at both ends of the workbench (1), the driving mechanism (2) comprising an arc-shaped plate (27), a support block (6) being installed at the end of the arc-shaped plate (27), a frame body (5) being placed on the support block (6), a positioning rod (4) being fixedly connected to the support block (6), the positioning rod (4) being abutted against the inside of the frame body (5), a mounting seat (41) being fixedly installed at the upper end of the positioning rod (4), a welding mechanism (3) being provided on the mounting seat (41), the welding mechanism (3) comprising a multi-axis mechanical arm (31), the multi-axis mechanical arm (31) being fixedly installed on the mounting seat (41), and an arc welding gun (33) being installed at one end of the multi-axis mechanical arm (31).

2. The automotive aluminum alloy subframe welding equipment according to claim 1, characterized in that: A mounting frame (32) is fixedly mounted on the end of the multi-axis mechanical arm (31), the arc welding gun (33) is fixedly mounted on the mounting frame (32), and a laser scanner (34) is also fixedly mounted on the mounting frame (32).

3. The automotive aluminum alloy subframe welding equipment according to claim 1, characterized in that: A fixing plate (21) is fixedly mounted on the lower surface of the workbench (1), an electric push rod (22) is fixedly mounted on the fixing plate (21), and an output end of the electric push rod (22) is fixedly connected to a connecting plate (23).

4. The automotive aluminum alloy subframe welding equipment according to claim 3, characterized in that: A guide rail (24) is fixedly mounted on the upper surface of the workbench (1), a double-sided rack (25) is slidably connected to the guide rail (24), and the upper end of the connecting plate (23) is fixedly connected to both sides of the lower surface of the double-sided rack (25).

5. The automotive aluminum alloy subframe welding equipment according to claim 4, characterized in that: Both sides of the double-sided rack (25) are meshedly connected with gears (26), and the gear (26) is fixedly mounted on one end of the arc plate (27) away from the support block (6). The gear (26) and one end of the arc plate (27) are rotatably mounted on the workbench (1) through a connecting piece.

6. The automotive aluminum alloy subframe welding equipment according to claim 5, characterized in that: The connecting member is configured as a fixed shaft, the fixed shaft is fixedly connected to the upper surface of the 1, and the gear (26) and the arc plate (27) are both rotatably connected to the fixed shaft.

7. The automotive aluminum alloy subframe welding equipment according to claim 5, characterized in that: The gear (26) and the arc plate (27) are provided with a first through hole (261) and a second through hole (271) which are aligned, and the workbench (1) is provided with a plurality of mounting holes (7) which are arranged side by side and at equal distances, and the first through hole (261) and the second through hole (271) can be aligned with any group of mounting holes (7); the connecting member comprises two limiting shafts (8) and a locking member for locking the double-sided rack (25) and the gear (26); the two limiting shafts (8) are inserted into the corresponding first through hole (261), the second through hole (271) and the mounting hole (7).

8. The automotive aluminum alloy subframe welding equipment according to claim 7, characterized in that: The locking member comprises a round rod (9), the round rod (9) being fixedly connected to the upper ends of the two limiting shafts (8), a sleeve ring (10) being rotatably sleeved on the round rod (9), a first connecting frame (11) being fixedly connected to the lower end of the sleeve ring (10), a roller body (12) being rotatably connected to the first connecting frame (11), a plurality of annular equidistantly arranged magnetic strips (13) being provided on the outer surface of the roller body (12), the magnetic strips (13) being able to be attracted to the upper surface of the double-sided rack (25); The upper end of the sleeve ring (10) is fixedly connected to a second connecting frame (14), the height dimension of the second connecting frame (14) is greater than the height dimension of the first connecting frame (11), and the end of the second connecting frame (14) away from the round rod (9) is fixedly connected to a clamping block (15), and the upper surface of the double-sided rack (25) is provided with a plurality of equidistantly arranged clamping grooves (251), and the clamping block (15) can be clamped into the clamping grooves (251).

9. The automotive aluminum alloy subframe welding equipment according to claim 1, characterized in that: A fixing block (62) is fixedly installed inside the support block (6), and a support frame (61) is rotatably installed on the fixing block (62); the upper surface of the support frame (61) is higher than the upper surface of the support block (6), and the upper surface of the support frame (61) is in contact with the bottom of the frame body (5).

10. A method for using an automobile aluminum alloy subframe welding device, applicable to the automobile aluminum alloy subframe welding device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The frame body (5) is sleeved on the four positioning rods (4) so ​​that its lower surface is placed on the support frame (61); Then, the electric push rod (22) is started to drive the connecting plate (23) to move, and the connecting plate (23) drives the double-sided rack (25) to move in the direction close to the frame body (5), and the gear (26) drives the arc plate (27) to rotate, so that the arc plate (27) gradually opens outward until the positioning rod (4) is pressed against the inner wall of the frame body (5), and the multi-axis mechanical arm (31) follows the positioning rod (4) and moves synchronously to the vicinity of the frame body (5) and is fixed, and the welding part of the frame body (5) is scanned by the laser scanner (34); The welding parameters and path of the arc welding gun (33) are adjusted according to the scanning results, and finally the arc welding gun (33) is driven by the multi-axis mechanical arm (31) to perform mobile welding, so that welding is performed on multiple parts simultaneously.

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