Automobile frame welding positioning device and method

Abstract

The application belongs to the technical field of automobile manufacturing, and provides a kind of automobile frame welding positioning device and method, including clamping table, a plurality of symmetrical distribution positioning mechanisms are slidably installed on the clamping table, and are divided into internal positioning mechanism, middle positioning mechanism and end positioning mechanism, respectively used for positioning and clamping steel beam, middle bending and end bending;Bending mechanism is installed at both ends of the clamping table, used to drive the end positioning mechanism to move and assist end bending;Adjusting mechanism is also installed on the clamping table, used to drive each group of positioning mechanisms to move relatively or oppositely.The application realizes multi-angle bending and 90-degree bending of steel beam through multi-group positioning mechanism hierarchical arrangement and bending mechanism cooperation, omits complicated installation steps, improves welding efficiency and bending accuracy.

Description

Technical Field

[0001] This invention belongs to the field of automobile manufacturing technology, and in particular relates to an automobile frame welding positioning device and method. Background Technology

[0002] The car frame is a crucial load-bearing component of a vehicle, typically constructed by welding two channel steel beams bent at specific angles. During frame production, the steel beams undergo multiple bending processes, including multi-angle bends in the middle and 90-degree bends at the ends. After bending, the bent sections are welded together, ultimately joining the two steel beams to form a complete frame.

[0003] In existing technologies, bending steel beams typically involves using a manual hoist in conjunction with a simple clamp. The manual hoist requires pre-installation and fixation in a specific location, making the operation cumbersome and inefficient. Furthermore, the bending force of a manual hoist relies on manual control, making it difficult to precisely control the bending displacement and angle, resulting in unstable bending accuracy and affecting subsequent welding quality. Summary of the Invention

[0004] The purpose of this invention is to provide a welding positioning device and method for automobile frames, which aims to solve the technical problems of using manual hoists for bending operations during automobile frame welding in the prior art, which is cumbersome to install, inefficient, and difficult to guarantee bending accuracy.

[0005] The present invention is implemented as follows: an automobile frame welding positioning device and method, including a clamping table, on which a plurality of positioning mechanisms are slidably mounted, the number of positioning mechanisms being even, the plurality of positioning mechanisms being symmetrically distributed about the center plane of the clamping table, each pair of corresponding positioning mechanisms forming a group, the plurality of groups of positioning mechanisms being distributed along the length direction of the clamping table, and the plurality of groups of positioning mechanisms being symmetrically distributed about the center of the length direction of the clamping table;

[0006] The multiple positioning mechanisms are referred to as the internal positioning mechanism, the middle positioning mechanism, and the end positioning mechanism from the inside out. The internal positioning mechanism is used to position and clamp the frame, the middle positioning mechanism is used to clamp and bend the middle part of the frame, and the end positioning mechanism is used to bend the end of the frame.

[0007] Both ends of the clamping platform are equipped with bending mechanisms, and the two sets of end positioning mechanisms are respectively installed on the two bending mechanisms. The bending mechanisms are used to drive the end positioning mechanisms to move, so as to push the end of the frame, thereby assisting the positioning mechanisms to bend the end of the frame.

[0008] The clamping platform is also equipped with multiple adjustment mechanisms. Each set of positioning mechanisms is installed on the output end of one of the adjustment mechanisms. The adjustment mechanism is used to drive the two positioning mechanisms to move relative to or away from each other.

[0009] A further technical solution: The positioning mechanism includes a slider slidably mounted on the clamping table, a lifting rod slidably mounted vertically inside the slider, and a clamping mechanism mounted on one end of the lifting rod extending out of the slider, the clamping mechanism being used to clamp the steel beam;

[0010] The positioning mechanism further includes a drive assembly, which is mounted on the slider. The output end of the drive assembly is connected to the lifting rod in a transmission manner, and the drive assembly is used to drive the lifting rod to rise and fall.

[0011] The drive assembly includes a first servo motor fixedly installed inside the slider. The output shaft of the first servo motor is fixedly connected to a first screw, and one end of the first screw is threadedly connected to the lifting rod.

[0012] Further technical solution: The clamping mechanism includes a support platform fixedly connected to the end of the lifting rod, a sliding clamp seat slidably mounted on the support platform, a return spring connected between the sliding clamp seat and the support platform, and a clamping assembly mounted on the sliding clamp seat, the clamping assembly being used to fix the steel beam on the sliding clamp seat;

[0013] The clamping mechanism further includes a limiting mechanism, which is mounted on the support platform. The output end of the limiting mechanism can be inserted into the sliding clamp seat, and the limiting mechanism is used to fix the sliding clamp seat on the support platform.

[0014] The clamping assembly includes a clamping plate slidably mounted on the sliding clamping seat, a second screw rotatably mounted on the side of the clamping plate, the second screw being threadedly connected to the sliding clamping seat, and a rotating handle fixedly connected to one end of the second screw.

[0015] The limiting mechanism includes a mounting bracket fixedly installed on the side of the support platform, a cylinder fixedly installed on the mounting bracket, a limiting rod fixedly installed on the movable end of the cylinder, and a limiting hole adapted to the limiting rod is opened on the side of the sliding clamp.

[0016] A further technical solution: A guide assembly is installed on the lifting rod, and the guide assembly includes a limiting side plate disposed on the side of the lifting rod;

[0017] The guide assembly also includes a mounting cavity formed inside the lifting rod, a lifting block is slidably mounted inside the mounting cavity, the limiting side plate is fixedly connected to the lifting block, the lifting rod has an movable hole adapted to the limiting side plate, a third screw is rotatably mounted inside the mounting cavity, the third screw is threadedly connected to the lifting block, and a second servo motor is fixedly mounted on the side of the lifting rod, the output shaft of the second servo motor extending into the mounting cavity is connected to the third screw by a transmission pair.

[0018] A further technical solution: The adjustment mechanism includes a third servo motor fixedly installed on the side of the clamping table. The output shaft of the third servo motor is fixedly connected to a double-ended screw. The double-ended screw is rotatably installed on the clamping table. Two corresponding positioning mechanisms are respectively threaded to the two ends of the double-ended screw.

[0019] The bending mechanism includes a slide groove formed on the clamping table, a slide table slidably installed inside the slide groove, an end positioning mechanism installed on the slide table, a fourth servo motor fixedly installed on the side of the clamping table, a fourth screw fixedly connected to the output shaft of the fourth servo motor, and the fourth screw threadedly connected to the slide table.

[0020] The present invention also provides a welding method using the above-mentioned automotive frame welding positioning device, comprising the following steps:

[0021] S1. Pre-cut off excess steel at the curved part of the steel beam, place the steel beam on the positioning mechanism, fix the steel beam through the internal positioning mechanism, and adjust the position of the steel beam so that the curved part extends to the side of the central positioning mechanism.

[0022] S2. The adjustment mechanism drives the central positioning mechanism to move, apply pressure to the side of the steel beam, and cause the steel beam to bend. After bending into place, the bent part is welded.

[0023] S3. When bending the end of the steel beam, the bent steel beam is clamped and fixed by the internal positioning mechanism and the middle positioning mechanism. The end of the steel beam is extended to the side of an end positioning mechanism. The end positioning mechanism is moved by the adjustment mechanism, so that the end positioning mechanism drives the end of the steel beam to rotate.

[0024] S4. When the end positioning mechanism is about to detach from the end of the steel beam, use another end positioning mechanism to abut against the other end of the steel beam. Drive the end positioning mechanism to move along the length of the steel beam through the bending mechanism, so that the end of the steel beam continues to bend to 90 degrees. After bending into place, welding is performed.

[0025] S5. Repeat the above steps. After welding the two steel beams, install the two steel beams on the two positioning mechanisms respectively, connect them, and complete the welding between the two steel beams.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. By setting up multiple symmetrically distributed positioning mechanisms on the clamping table, which are divided into internal positioning mechanism, middle positioning mechanism and end positioning mechanism, the positioning and clamping, middle bending and end bending of the steel beam are realized respectively. There is no need to use a manual hoist for bending operation, which eliminates the tedious steps of installing a manual hoist and significantly improves welding efficiency.

[0028] 2. By setting up a bending mechanism and working in conjunction with two end positioning mechanisms, a large-angle bending of 90 degrees can be achieved at the end of the steel beam, solving the problem of difficulty in achieving the desired bending angle in a single operation, and improving bending accuracy and production efficiency.

[0029] 3. The clamping mechanism is equipped with a sliding clamp and a limiting mechanism. When the end of the steel beam is bent, the sliding clamp can move with the steel beam after the limiting mechanism is released, which avoids the steel beam from damaging the clamping mechanism and improves the service life and operational safety of the device.

[0030] 4. By setting an adjustable guide component on the lifting rod, the width of the guide channel can be adjusted according to the width or thickness of the steel beam, adapting to the bending requirements of different parts and further improving the bending accuracy of the steel beam.

[0031] 5. The movement of each mechanism is driven by a servo motor and screw drive, and the bending force and displacement can be precisely controlled, ensuring the stability of bending accuracy and welding quality. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall front view of the present invention.

[0033] Figure 2 This is a top view of the overall structure of the present invention.

[0034] Figure 3 This is a schematic diagram of the cross-sectional structure of the positioning mechanism in this invention.

[0035] Figure 4 In this invention Figure 3 Enlarged diagram of point A in the middle.

[0036] Figure 5 In this invention Figure 3 Enlarged structural diagram at point B.

[0037] In the attached diagram: 1. Clamping table; 2. Positioning mechanism; 21. Slider; 22. Drive assembly; 221. First servo motor; 222. First screw; 23. Lifting rod; 24. Return spring; 25. Support platform; 26. Sliding clamp; 27. Clamping assembly; 271. Second screw; 272. Rotating handle; 273. Clamping plate; 28. Limiting mechanism; 281. Cylinder; 282. Mounting bracket; 283. Limiting rod; 284. Limiting hole; 29. ​​Guide assembly; 291. Limiting side plate; 292. Movable hole; 293. Mounting cavity; 294. Third screw; 295. Lifting block; 296. Transmission pair; 297. Second servo motor; 3. Adjustment mechanism; 31. Third servo motor; 32. Double-ended screw; 4. Bending mechanism; 41. Fourth servo motor; 42. Fourth screw; 43. Slide table; 44. Slide groove. Detailed Implementation

[0038] 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 merely illustrative and not intended to limit the invention.

[0039] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0040] like Figures 1-5 As shown, this invention provides a welding and positioning device for an automobile frame, including a clamping table 1. Multiple positioning mechanisms 2 are slidably mounted on the clamping table 1. There is an even number of positioning mechanisms 2, and they are symmetrically distributed about the center plane of the clamping table 1. Each pair of corresponding positioning mechanisms 2 forms a group. The multiple groups of positioning mechanisms 2 are distributed along the length direction of the clamping table 1, and are symmetrically distributed about the center of the length direction of the clamping table 1. The multiple groups of positioning mechanisms 2 are sequentially referred to from the inside out as an internal positioning mechanism 2, a middle positioning mechanism 2, and an end positioning mechanism 2. The internal positioning mechanism 2 is used for positioning and clamping the frame, the middle positioning mechanism 2 is used for clamping and bending the middle part of the frame, and the end positioning mechanism 2 is used for bending the ends of the frame.

[0041] Both ends of the clamping platform 1 are equipped with bending mechanisms 4. The two sets of end positioning mechanisms 2 are respectively installed on the two bending mechanisms 4. The bending mechanism 4 is used to drive the end positioning mechanism 2 to move, so as to push the end of the frame, thereby assisting the positioning mechanism 2 to bend the end of the frame.

[0042] The clamping table 1 is also equipped with multiple adjustment mechanisms 3. Each set of positioning mechanisms 2 is installed on the output end of an adjustment mechanism 3. The adjustment mechanism 3 is used to drive the two positioning mechanisms 2 to move relative to or away from each other.

[0043] Specifically, the frame is made by bending two channel steel beams at a specific angle and then welding them together. During bending, the bent part usually needs to be cut to remove excess steel, which saves effort and also forms a complete whole after bending.

[0044] Therefore, when using this device, the steel at the bent part needs to be cut off in advance, and then the steel beam is placed on the positioning mechanism 2 and fixed by the internal positioning mechanism 2. By adjusting the position of the steel beam, the bent part extends to the side of the middle positioning mechanism 2. After the steel beam is fixed, the middle positioning mechanism 2 is moved by the adjusting mechanism 3. The positioning mechanism 2 will apply pressure to the side of the steel beam and drive the end of the positioning mechanism 2 to rotate, so as to achieve bending of the positioning mechanism 2. When the bending is in place, the workers can weld the bent part. By repeating the above operation, all the bent parts of the steel beam can be welded.

[0045] Furthermore, since the end of the steel beam needs to be bent at 90°, it cannot be bent into place in one go using the intermediate positioning mechanism 2. Therefore, when bending the end of the steel beam, the already bent steel beam needs to be clamped and fixed by the internal positioning mechanism 2 and the intermediate positioning mechanism 2, and the end of the steel beam is extended to the side of one end positioning mechanism 2. Then, the adjustment mechanism 3 drives the end positioning mechanism 2 to move, so that the end positioning mechanism 2 drives the end of the steel beam to rotate. When the end positioning mechanism 2 is about to disengage from the end of the steel beam, another end positioning mechanism 2 is used to abut against the other end of the steel beam. Then, the bending mechanism 4 drives the end positioning mechanism 2 to move along the length of the steel beam. The end positioning mechanism 2 will drive the steel beam to move. Since one end of the steel beam is blocked, the end of the steel beam can continue to be bent. In this way, the end of the steel beam can be bent at 90° smoothly. After bending into place, it can be welded. This invention eliminates the need to use a manual hoist for bending operations, omitting the cumbersome steps of installing a manual hoist and improving welding efficiency.

[0046] It is worth noting that when one end of the steel beam is bent and welded, the positioning mechanism 2 on the other side can clamp and fix the steel beam to improve the welding accuracy of the steel beam.

[0047] After both steel beams are welded, they can be installed on the two positioning mechanisms 2 respectively, then the two steel beams are joined together, and finally the welding operation between the two steel beams is completed, thus completing the welding of the frame.

[0048] The present invention provides an automotive frame welding positioning device. In this embodiment, the positioning mechanism 2 includes a slider 21 slidably mounted on a clamping table 1. A lifting rod 23 is vertically slidably mounted inside the slider 21. A clamping mechanism is installed at one end of the lifting rod 23 extending out of the slider 21. The clamping mechanism is used to clamp the steel beam. The positioning mechanism 2 also includes a drive assembly 22, which is mounted on the slider 21. The output end of the drive assembly 22 is connected to the lifting rod 23 in a transmission manner. The drive assembly 22 is used to drive the lifting rod 23 to rise and fall.

[0049] Specifically, the output end of the adjustment mechanism 3 is connected to the slider 21 via a transmission.

[0050] The drive assembly 22 can adjust the height of the clamping mechanism to accommodate the different bending heights of the steel beam.

[0051] Meanwhile, when bending the steel beam, the intermediate positioning mechanism 2 needs to be moved to the side of the steel beam through the adjustment mechanism 3, and the lifting rod 23 is raised through the drive component 22. The lifting rod 23 is used to squeeze the steel beam. Then, the position of the steel beam is adjusted so that the bent part of the steel beam extends to the side of the lifting rod 23. Finally, the internal positioning mechanism 2 is used to fix the steel beam, and then the bending operation of the steel beam can be performed.

[0052] Specifically, the adjustment mechanism 3 drives the middle slider 21 to move, so that the slider 21 drives the lifting rod 23 to squeeze the side of the steel beam, so as to compress the steel beam to bend and deform. In addition, the bending operation of the end of the steel beam is the same, except that the end positioning mechanism 2 is used to squeeze it.

[0053] The present invention provides an automotive frame welding positioning device. In this embodiment, the clamping mechanism includes a support platform 25 fixedly connected to the end of the lifting rod 23. A sliding clamp 26 is slidably mounted on the support platform 25. A return spring 24 is connected between the sliding clamp 26 and the support platform 25. A clamping assembly 27 is mounted on the sliding clamp 26. The clamping assembly 27 is used to fix the steel beam on the sliding clamp 26.

[0054] The clamping mechanism also includes a limiting mechanism 28, which is mounted on the support platform 25. The output end of the limiting mechanism 28 can be inserted into the sliding clamp 26. The limiting mechanism 28 is used to fix the sliding clamp 26 on the support platform 25 and prevent the sliding clamp 26 from sliding when the middle part of the steel beam is bent.

[0055] Specifically, initially, the limiting mechanism 28 fixes the sliding clamp 26 to the support platform 25, and the steel beam is placed inside the sliding clamp 26. The steel beam is fixed by the clamping assembly 27, and bending operation can be performed. When bending the end of the steel beam, the limiting mechanism 28 is operated to release the fixation of the sliding clamp 26. When the end positioning mechanism 2 moves the steel beam, the steel beam will move the sliding clamp 26 together, thereby preventing the steel beam from damaging the clamping mechanism.

[0056] The present invention provides an automotive frame welding positioning device. In this embodiment, the clamping assembly 27 includes a clamping plate 273 slidably mounted on a sliding clamping seat 26. A second screw 271 is rotatably mounted on the side of the clamping plate 273. The second screw 271 is threadedly connected to the sliding clamping seat 26. One end of the second screw 271 is fixedly connected to a rotating handle 272.

[0057] Rotating the rotating handle 272 causes the second screw 271 to rotate, which in turn moves the second screw 271 relative to the sliding clamp 26. The second screw 271 then moves the clamping plate 273 to clamp the steel beam.

[0058] The present invention provides an automotive frame welding positioning device. In this embodiment, the limiting mechanism 28 includes a mounting bracket 282 fixedly installed on the side of the support platform 25. A cylinder 281 is fixedly installed on the mounting bracket 282. A limiting rod 283 is fixedly installed on the movable end of the cylinder 281. A limiting hole 284 adapted to the limiting rod 283 is opened on the side of the sliding clamp 26.

[0059] Specifically, initially (when the return spring 24 is in its natural state), the limiting hole 284 is exactly on the side of the limiting rod 283.

[0060] The cylinder 281 is activated, which causes the limiting rod 283 to extend, thereby inserting the limiting rod 283 into the limiting hole 284 to fix the sliding clamp 26 onto the support platform 25.

[0061] After the steel beam moves the sliding clamp 26 and removes the steel beam, the sliding clamp 26 moves to the middle of the support platform 25 under the action of the return spring 24. At this time, the limiting hole 284 is on the side of the limiting rod 283, and the cylinder 281 can be operated to fix the sliding clamp 26.

[0062] The present invention provides an automotive frame welding positioning device. In this embodiment, the drive component 22 includes a first servo motor 221 fixedly installed inside the slider 21. The output shaft of the first servo motor 221 is fixedly connected to a first screw 222. One end of the first screw 222 is threadedly connected to the lifting rod 23.

[0063] The present invention provides an automotive frame welding positioning device. In order to achieve higher bending accuracy of the steel beam when the lifting rod 23 is used to compress the steel beam, in this embodiment, a guide component 29 is installed on the lifting rod 23. The guide component 29 includes a limiting side plate 291 disposed on the side of the lifting rod 23.

[0064] Because the bending direction of the middle part of the steel beam is perpendicular to the bending direction of its ends, and the width and thickness of the steel beam are different, the contact points between the steel beam and the lifting rod 23 are different when bending different parts of the steel beam. In order to further improve the bending accuracy of the steel beam, the guide assembly 29 also includes an installation cavity 293 opened inside the lifting rod 23. A lifting block 295 is slidably installed inside the installation cavity 293. The limiting side plate 291 is fixedly connected to the lifting block 295. The lifting rod 23 is provided with an active hole 292 adapted to the limiting side plate 291. A third screw 294 is rotatably installed inside the installation cavity 293. The third screw 294 is threadedly connected to the lifting block 295. A second servo motor 297 is also fixedly installed on the side of the lifting rod 23. The output shaft of the second servo motor 297 extending into the installation cavity 293 is connected to the third screw 294 by a transmission pair 296.

[0065] Specifically, the second servo motor 297 is started, and the second servo motor 297 drives the third screw 294 to rotate through the transmission pair 296. The third screw 294 drives the lifting block 295 and the limiting side plate 291 to move, so as to adjust the distance between the limiting side plate 291 and the bottom of the support platform 25. A guide channel is formed between the limiting side plate 291 and the support platform 25. When bending the steel beam, the steel beam can be extended between the limiting side plate 291 and the support platform 25, and the width of the guide channel can be adjusted to match the width or thickness of the steel beam, so that the steel beam can move in the guide channel, thereby improving the bending accuracy of the steel beam.

[0066] The present invention provides an automotive frame welding positioning device. In this embodiment, the adjustment mechanism 3 includes a third servo motor 31 fixedly installed on the side of the clamping table 1. The output shaft of the third servo motor 31 is fixedly connected to a double-ended screw 32. The double-ended screw 32 is rotatably installed on the clamping table 1. Two corresponding positioning mechanisms 2 are respectively threaded to the two ends of the double-ended screw 32.

[0067] Start the third servo motor 31, which can drive the double-headed screw 32 to rotate. The double-headed screw 32 can drive the two positioning mechanisms 2 to move relative to each other or away from each other, so as to adjust the position of the positioning mechanism 2 according to the bending part of the steel beam.

[0068] The present invention provides an automotive frame welding positioning device. In this embodiment, the bending mechanism 4 includes a slide groove 44 formed on the clamping table 1. A slide table 43 is slidably installed inside the slide groove 44. An end positioning mechanism 2 is installed on the slide table 43. A fourth servo motor 41 is also fixedly installed on the side of the clamping table 1. The output shaft of the fourth servo motor 41 is fixedly connected to a fourth screw 42. The fourth screw 42 is threadedly connected to the slide table 43.

[0069] Specifically, the fourth servo motor 41 is started, which drives the fourth screw 42 to rotate. The fourth screw 42 drives the slide 43 to move, and the slide 43 drives the end positioning mechanism 2 to move, so as to push the end of the steel beam and complete the bending of the end of the steel beam.

[0070] The present invention provides an automobile frame welding positioning device. In this embodiment, an electric hoist is also provided above the clamping table 1 to assist in the installation and position adjustment of the steel beam.

[0071] This embodiment also provides a welding method using the above-mentioned automotive frame welding positioning device, including the following steps:

[0072] S1. Pre-cut off excess steel at the bent section of the steel beam, place the steel beam on the positioning mechanism 2, and fix the steel beam using the internal positioning mechanism 2. Adjust the position of the steel beam so that the bent section extends to the side of the central positioning mechanism 2. Specifically, after placing the steel beam on the positioning mechanism 2, clamp and fix the steel beam using the clamping assembly 27 of the internal positioning mechanism 2, and then adjust the position of the steel beam so that the part to be bent is aligned with the side of the lifting rod 23 of the central positioning mechanism 2.

[0073] S2. The adjusting mechanism 3 drives the central positioning mechanism 2 to move, applying pressure to the side of the steel beam and causing it to bend. After bending, the bent part is welded. Specifically, the third servo motor 31 is started, which drives the double-headed screw 32 to rotate. The double-headed screw 32 drives the slider 21 of the central positioning mechanism 2 to move. The slider 21 drives the lifting rod 23 to press the side of the steel beam, forcing it to bend and deform. When bending is in place, the worker can weld the bent part. Repeating the above operation allows welding to be performed on all the bent parts of the steel beam. It is worth noting that when bending and welding one end of the steel beam, the positioning mechanism 2 on the other side can clamp and fix the steel beam to improve the welding accuracy.

[0074] S3. When bending the end of the steel beam, the bent steel beam is clamped and fixed by the internal positioning mechanism 2 and the middle positioning mechanism 2. The end of the steel beam is extended to the side of the end positioning mechanism 2. The end positioning mechanism 2 is moved by the adjusting mechanism 3, so that the end positioning mechanism 2 drives the end of the steel beam to rotate. Specifically, since the end of the steel beam needs to be bent 90 degrees, it cannot be bent into place in one go by the middle positioning mechanism 2. Therefore, when bending the end of the steel beam, the bent steel beam needs to be clamped and fixed by the internal positioning mechanism 2 and the middle positioning mechanism 2. The end of the steel beam is extended to the side of the lifting rod 23 of the end positioning mechanism 2. Then, the end positioning mechanism 2 is moved by the adjusting mechanism 3, so that the lifting rod 23 of the end positioning mechanism 2 drives the end of the steel beam to rotate.

[0075] S4. When the end positioning mechanism 2 is about to detach from the end of the steel beam, another end positioning mechanism 2 is used to abut against the other end of the steel beam. The bending mechanism 4 drives the end positioning mechanism 2 to move along the length of the steel beam, so that the end of the steel beam continues to bend to 90 degrees. Welding is then performed after the bending is in place. Specifically, when the end positioning mechanism 2 is about to detach from the end of the steel beam, the other end positioning mechanism 2 is activated, so that its lifting rod 23 abuts against the other end of the steel beam. Then, the fourth servo motor 41 is started, which drives the fourth screw 42 to rotate. The fourth screw 42 drives the slide table 43 to move along the slide groove 44. The slide table 43 drives the end positioning mechanism 2 to move along the length of the steel beam. The end positioning mechanism 2 will then drive the steel beam to move. Since one end of the steel beam is blocked by the end positioning mechanism 2 on the other side, the end of the steel beam can continue to be bent. In this way, the end of the steel beam can be bent smoothly at 90 degrees. After bending to the correct position, it can be welded. When bending the end of the steel beam, the limit mechanism 28 needs to be operated to release the fixation of the sliding clamp 26, so that the sliding clamp 26 can move with the steel beam, thereby preventing the steel beam from damaging the clamping mechanism.

[0076] S5. Repeat the above steps. After welding the two steel beams, install the two steel beams on the two positioning mechanisms 2 respectively, connect them, and complete the welding between the two steel beams. Specifically, after both steel beams are welded, install the two steel beams on the two positioning mechanisms 2 respectively, then connect the two steel beams, and finally complete the welding operation between the two steel beams to complete the welding of the frame.

[0077] The automotive frame welding positioning device and welding method provided by this invention eliminates the need for manual hoists for bending operations, omitting the tedious steps of installing manual hoists and improving welding efficiency. By using a bending mechanism in conjunction with a double-end positioning mechanism, a large-angle bending of 90 degrees can be achieved at the end of the steel beam. The sliding clamp design of the clamping mechanism can prevent the steel beam from damaging the clamping mechanism. The guide component can be adjusted to adapt to different steel beam sizes, improving bending accuracy.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0079] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A welding and positioning device for an automobile frame, comprising a clamping table, characterized in that, Multiple positioning mechanisms are slidably mounted on the clamping platform. There are an even number of positioning mechanisms. The multiple positioning mechanisms are symmetrically distributed about the center plane of the clamping platform. Each pair of corresponding positioning mechanisms forms a group. The multiple groups of positioning mechanisms are distributed along the length direction of the clamping platform, and the multiple groups of positioning mechanisms are symmetrically distributed about the center of the length direction of the clamping platform. The multiple positioning mechanisms are referred to as the internal positioning mechanism, the middle positioning mechanism, and the end positioning mechanism from the inside out. The internal positioning mechanism is used to position and clamp the frame, the middle positioning mechanism is used to clamp and bend the middle part of the frame, and the end positioning mechanism is used to bend the end of the frame. Both ends of the clamping platform are equipped with bending mechanisms, and the two sets of end positioning mechanisms are respectively installed on the two bending mechanisms. The bending mechanisms are used to drive the end positioning mechanisms to move, so as to push the end of the frame, thereby assisting the positioning mechanisms to bend the end of the frame. The clamping platform is also equipped with multiple adjustment mechanisms. Each set of positioning mechanisms is installed on the output end of one of the adjustment mechanisms. The adjustment mechanism is used to drive the two positioning mechanisms to move relative to or away from each other.

2. The automotive frame welding positioning device according to claim 1, characterized in that, The positioning mechanism includes a slider slidably mounted on the clamping table, a lifting rod vertically slidably mounted inside the slider, and a clamping mechanism mounted on one end of the lifting rod extending out of the slider. The clamping mechanism is used to clamp the steel beam. The positioning mechanism further includes a drive component, which is mounted on the slider. The output end of the drive component is connected to the lifting rod for transmission, and the drive component is used to drive the lifting rod to rise and fall.

3. The automotive frame welding positioning device according to claim 2, characterized in that, The drive assembly includes a first servo motor fixedly installed inside the slider. The output shaft of the first servo motor is fixedly connected to a first screw, and one end of the first screw is threadedly connected to the lifting rod.

4. The automotive frame welding positioning device according to claim 2, characterized in that, The clamping mechanism includes a support platform fixedly connected to the end of the lifting rod, a sliding clamp seat slidably mounted on the support platform, a return spring connected between the sliding clamp seat and the support platform, and a clamping assembly mounted on the sliding clamp seat, the clamping assembly being used to fix the steel beam on the sliding clamp seat; The clamping mechanism further includes a limiting mechanism, which is mounted on the support platform. The output end of the limiting mechanism can be inserted into the sliding clamp seat, and the limiting mechanism is used to fix the sliding clamp seat on the support platform.

5. The automotive frame welding positioning device according to claim 4, characterized in that, The clamping assembly includes a clamping plate slidably mounted on the sliding clamping seat, a second screw rotatably mounted on the side of the clamping plate, the second screw being threadedly connected to the sliding clamping seat, and a rotating handle fixedly connected to one end of the second screw.

6. The automotive frame welding positioning device according to claim 4, characterized in that, The limiting mechanism includes a mounting bracket fixedly installed on the side of the support platform, a cylinder fixedly installed on the mounting bracket, a limiting rod fixedly installed on the movable end of the cylinder, and a limiting hole adapted to the limiting rod is opened on the side of the sliding clamp.

7. The automotive frame welding positioning device according to claim 2, characterized in that, A guide assembly is installed on the lifting rod, and the guide assembly includes a limiting side plate disposed on the side of the lifting rod; The guide assembly also includes a mounting cavity formed inside the lifting rod, a lifting block is slidably mounted inside the mounting cavity, the limiting side plate is fixedly connected to the lifting block, the lifting rod has an movable hole adapted to the limiting side plate, a third screw is rotatably mounted inside the mounting cavity, the third screw is threadedly connected to the lifting block, and a second servo motor is fixedly mounted on the side of the lifting rod, the output shaft of the second servo motor extending into the mounting cavity is connected to the third screw by a transmission pair.

8. The automotive frame welding positioning device according to claim 1, characterized in that, The adjustment mechanism includes a third servo motor fixedly installed on the side of the clamping table. The output shaft of the third servo motor is fixedly connected to a double-ended screw. The double-ended screw is rotatably installed on the clamping table. Two corresponding positioning mechanisms are threadedly connected to the two ends of the double-ended screw.

9. The automotive frame welding positioning device according to claim 1, characterized in that, The bending mechanism includes a slide groove formed on the clamping table, a slide table slidably installed inside the slide groove, an end positioning mechanism installed on the slide table, a fourth servo motor fixedly installed on the side of the clamping table, a fourth screw fixedly connected to the output shaft of the fourth servo motor, and the fourth screw threadedly connected to the slide table.

10. A welding method using the automotive frame welding positioning device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Pre-cut off excess steel at the curved part of the steel beam, place the steel beam on the positioning mechanism, fix the steel beam through the internal positioning mechanism, and adjust the position of the steel beam so that the curved part extends to the side of the central positioning mechanism. S2. The adjustment mechanism drives the central positioning mechanism to move, apply pressure to the side of the steel beam, and cause the steel beam to bend. After bending into place, the bent part is welded. S3. When bending the end of the steel beam, the bent steel beam is clamped and fixed by the internal positioning mechanism and the middle positioning mechanism. The end of the steel beam is extended to the side of an end positioning mechanism. The end positioning mechanism is moved by the adjustment mechanism, so that the end positioning mechanism drives the end of the steel beam to rotate. S4. When the end positioning mechanism is about to detach from the end of the steel beam, use another end positioning mechanism to abut against the other end of the steel beam. Drive the end positioning mechanism to move along the length of the steel beam through the bending mechanism, so that the end of the steel beam continues to bend to 90 degrees. After bending into place, welding is performed. S5. Repeat the above steps. After welding the two steel beams, install the two steel beams on the two positioning mechanisms respectively, connect them, and complete the welding between the two steel beams.

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