Flexible front floor welding production line and method thereof

Abstract

The invention discloses a flexible front floor welding production line and a method thereof, and relates to the technical field of automobile front floor manufacturing, the flexible front floor welding production line comprises a production line body, the periphery of one side of the production line body is provided with three part feeding openings, and the three part feeding openings are the first part feeding opening, the second part feeding opening and the third part feeding opening in sequence from left to right; and three sliding tables used for transporting the automobile front floor accessories are fixedly installed at the positions, facing inwards, of the three part feeding openings, the three sliding tables are the first sliding table, the second sliding table and the third sliding table in sequence from left to right, the three sliding tables correspond to the three part feeding openings one to one, and a part discharging opening is formed in one end of the production line. The production line is complete in technological process and comprises multiple welding processes such as spot welding, arc welding and stud welding, the welding processes are all station repair welding and air repair welding, operation is not needed in the welding period, the automobile front floor can be welded in a line body at a time, the technological rhythm is greatly improved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile front floor manufacturing, and in particular to a flexible front floor welding production line and a method thereof. Background Art

[0002] In current automobile manufacturing, the front floor assembly of an automobile, as an important component of the automobile body in white, has always been welded by spot welding combined with arc welding. In the existing technology, the welding speed of the front floor welding line is only 15-20jph, and the output is low, which cannot meet the production needs of existing automobile production lines. At the same time, due to the large number of modifications to the existing automobile front floor and the high reuse rate of vehicle models, the production line of a single model is easily idle, resulting in a disproportionate input and output.

[0003] After searching, the applicant found that a Chinese patent disclosed "a production line for producing different types of automobile floors", and its announcement number is "CN112355540A". This patent mainly uses two production lines to separately process the rear section and the front section of the rear floor of the automobile, and then weld the rear end of the rear floor and the front section of the rear floor into one piece after the processing is completed; based on the existing technology, the two production lines set up have caused an increase in production costs for the maintenance of the production lines and the occupation of processing space, and the two production lines set up are not conducive to making corresponding changes when the automobile floor is modified. Secondly, after the processing, the rear section and the front section of the rear floor need to be transferred to the welding point to weld the rear end of the rear floor and the front section of the rear floor, which delays the overall welding process and is not conducive to improving manufacturing efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a flexible front floor welding production line to solve the problem of low manufacturing efficiency of the automobile front floor in the automobile floor welding process proposed in the above background technology, because the welded parts need to be transferred after each welding step is completed.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flexible front floor welding production line, comprising a production line, wherein three loading openings are opened on the periphery of one side of the production line, and the three loading openings are upper loading opening one, upper loading opening two, and upper loading opening three from left to right, and three slides for transporting automobile front floor accessories are fixedly installed inwardly of the openings of the three loading openings, and the three slides are slide one, slide two, and slide three from left to right, and the three slides correspond to the three loading openings one by one, a lower loading opening is opened at one end of the production line, an arc welding fixture is provided at one end of the lower loading opening, a placing table is provided at the end of the arc welding fixture away from the lower loading opening, a repair welding fixture is provided at the end of the placing table away from the arc welding fixture, a transportation device for transporting the finished front floor is fixedly connected to the opening of the lower loading opening, the repair welding fixture, the arc welding fixture, and the placing table are all provided with stud welding on the side close to the production line, a PLC control box is provided on one side of the production line, and a plurality of robotic arms are provided in the production line.

[0006] Preferably, the transport device includes an inclined support frame fixed to the production line floor, one side of the inclined support frame is an inclined surface, an inclined plate that can reciprocate along the inclined surface is provided inside the inclined support frame, step plate 2 is fixedly connected to both sides of the inclined plate, step plate 1 is fixedly connected to both sides of the top surface of the inclined support frame, the treads of step plate 1 and step plate 2 are both inclined downward, and the tread of step plate 1 is fixedly connected to rollers.

[0007] Preferably, a guide rod is fixedly connected to the bottom surface of the inclined plate, and a guide groove matched with the guide rod is formed on one opposite side of the two step plates, and both ends of the guide rod extend into the interior of the guide groove respectively.

[0008] Preferably, one side of the inclined support frame is fixedly connected to a driving motor, the output end of the driving motor is fixedly connected to bevel gear 1, bevel gear 1 is meshingly connected to bevel gear 2, and one side of bevel gear 2 is provided with a connecting rod device for driving the inclined plate to move.

[0009] Preferably, the connecting rod device includes a transmission rod fixed to one side of bevel gear No. 2, the transmission rod is fixedly connected to a circular plate on a side away from bevel gear No. 2, the circular plate is rotatably connected to a push rod on a side away from the transmission rod, one end of the push rod away from the circular plate is rotatably connected to the inclined plate, and the connection between the circular plate and the push rod is located on one side of the center of the circular plate.

[0010] Preferably, one side of the inclined support frame is rotatably connected to a U-shaped frame, and the inside of the U-shaped frame is rotatably connected to multiple rollers. The U-shaped frame consists of a horizontal bar and two longitudinal bars, and the bottom surfaces of the two longitudinal bars are provided with a plurality of symmetrical sockets. One side of the inclined support frame is rotatably connected to two support rods, and the top ends of the two support rods are respectively inserted into the inside of the sockets.

[0011] Preferably, a conveyor belt fixedly connected to the workshop floor is provided on one side of the inclined support frame, two supporting legs are provided on both sides of the conveyor belt, a cross plate is fixedly connected between the two supporting legs, and an intercepting rod with adjustable height is provided on the top surface of the connecting plate.

[0012] Preferably, both sides of the bottom surface of the intercepting rod are rotatably connected with screw rods, the screw rods are threadedly connected to the cross plate, and the bottom surface of the intercepting rod is provided with two inclined guide rods, and the bottom surfaces of the two guide rods are slidably connected to the conveyor belt.

[0013] Preferably, seventeen of the robotic arms are provided in the production line, and are numbered from robotic arm one to robotic arm seventeen, and the seventeen robotic arms are respectively interspersed inside the production line.

[0014] The present invention also provides a method for using a flexible front floor welding production line, comprising the following steps: S1, manually load the front floor body from the loading port 1, which is composed of the middle channel and the front floor side panels, and then the slide 1 is inserted into the line body. At this time, the robot arm 1 and the robot 2 on one side of the slide 1 and the welding gun weld the front floor sheet metal parts; S2, the robot arm 3 on the other side of the slide 1 grabs the front floor sheet metal part, and the robot arm 1 and the robot arm 2 on one side of the slide 1 perform aerial repair welding on the front floor sheet metal part. During the repair welding, the slide 1 slides out and waits for manual loading; the robot arm 3 on the other side of the slide 1 grabs the plate and uses the fixed welding clamp to perform repair welding on the front floor sheet metal part. After the repair welding is completed, the robot waits for the next step of waiting for the part to be released; S3, manual loading of parts at loading port 2, which are the front cross beams of the left and right seats, slide 2 is moved into the loading position on the gripper, and robot arm 3 places the front floor sheet metal parts on the slide fixture. After that, robot arm 3 is reset and waits for the next cycle. Robot arms 4 and 5 on one side of slide 2 perform positioning welding on the sheet metal parts on the slide fixture; S4, after the welding is completed, the slide 2 slides out and waits for manual loading. The robot arm 6 on the other side of the slide 2 grabs the sheet metal part. The robot arms 4 and 5 perform aerial repair welding on the front floor sheet metal part. After the aerial repair is completed, the robot arm 6 carries the front floor sheet metal part for fixed repair welding. After the welding is completed, it goes to the next station to wait for the part to be placed. S5, loading port 3 manually loads the parts, which are the rear cross beams of the left and right seats. After the parts are loaded on slide 3, they slide into the line body, and robotic arm 6 places the parts. After the parts are placed, robotic arm 6 returns to its original position and waits for the next cycle. Robot arms 7, 8, and 9 on one side of slide 3 weld the front floor sheet metal parts; S6. After the welding is completed, the robot arm 10 on the other side of the slide 3 grabs the front floor sheet metal part, and the robot arms 7, 8, and 9 perform aerial repair welding on the front floor sheet metal part. After the aerial repair welding is completed, the robot arm 10 grabs the front floor sheet metal part for fixed repair welding. After the welding is completed, it is placed on the repair welding fixture; S7, the mechanical arm 11 and the mechanical arm 12 on one side of the repair welding fixture perform repair welding on the front floor sheet metal component; S8. After welding is completed, the stud welding on one side of the repair welding fixture is performed by the robot arm 13 grabbing the front floor sheet metal for welding. This station can weld a variety of different studs. After welding is completed, the robot arm 13 places the front floor sheet metal on the placement table, and then the robot arm 13 returns to its original position to wait for subsequent cycles; S9, the stud welding on one side of the placement table is performed by the robot arm 14 grabbing the front floor sheet metal part to weld the other side of the sheet metal part. After the welding is completed, the robot arm 14 will be placed on the arc welding fixture of the front floor sheet metal part; S10, the robot arm 15 and the robot arm 16 on the other side of the placement table perform arc welding on the sheet metal parts. After the welding is completed, the coding machine performs laser coding on the front floor panel. S11. After laser coding, the workpiece is grabbed by the robot arm 17 on one side of the arc welding fixture and welded to the stud welding. The welded front floor sheet metal part is welded to the remaining studs. After welding, it is placed on the conveyor belt of the lower part port to wait for transportation. S12. The finished products waiting for transfer are moved to the top surface of the conveyor belt. The finished products are screened by the intercepting rod to prevent the finished products from being stacked together, and are divided into single pieces, limited to only one piece passing through at a time. Then the finished products are moved to the top surface of the bottom step plate 1. At this time, the step plate 2 reciprocates along the inclined support frame, so that the workpieces can be transported along the step plate 1 in an orderly manner until they move to the top step plate 1, move to the finished product box through the roller, and finally pack and collect.

[0015] The technical effects and advantages of the present invention are as follows: the process flow of the production line is complete, including spot welding, arc welding, stud welding and other welding processes, and the welding processes are all workstation repair welding and aerial repair welding. No operation is required during welding, so that the front floor of the car can be welded in one go inside the line body, which greatly improves the process rhythm and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the production line of the present invention.

[0017] Figure 2 It is a schematic diagram of the top view of the production line of the present invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the transportation device of the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the inclined support frame of the present invention.

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the inclined plate of the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the U-shaped frame of the present invention.

[0022] In the figure: 1. upper opening; 2. slide; 3. robot arm; 4. stud welding; 5. repair welding fixture; 6. lower opening; 7. transportation device; 71. inclined support frame; 711. drive motor; 712. bevel gear one; 713. bevel gear two; 714. transmission rod; 715. round plate; 716. guide groove; 72. step plate one; 721. roller; 73. inclined plate; 731. guide rod; 732. push rod; 74. step plate two; 75. U-shaped frame; 751. socket; 76. roller; 77. support rod; 78. conveyor belt; 781. cross plate; 782. screw; 783. intercepting rod; 784. guardrail; 8. arc welding fixture; 9. PLC control box; 10. placement table. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 and Figure 2 As shown, three loading ports 1 are opened on the periphery of one side of the production line, and the three loading ports 1 are upper loading port 1, upper loading port 2, and upper loading port 3 from left to right, and three slides 2 for transporting automobile front floor accessories are fixedly installed inwardly of the openings of the three loading ports 1, and the three slides 2 are slide 1, slide 2, and slide 3 from left to right, and the three slides 2 correspond to the three loading ports 1 one by one, and a lower loading port 6 is opened at one end of the production line, and an arc welding fixture 8 is provided at one end of the lower loading port 6, and a placing table 10 is provided at the end of the arc welding fixture 8 away from the lower loading port 6, and a repair welding fixture 5 is provided at the end of the placing table 10 away from the arc welding fixture 8, and a transport device 7 for transporting the finished front floor is fixedly connected to the opening of the lower loading port 6, and a stud welding 4 is provided on the side of the repair welding fixture 5, the arc welding fixture 8, and the placing table 10 close to the production line, and a PLC control box 9 is provided on one side of the production line, and a plurality of robotic arms 3 are provided in the production line; During manufacturing, the main body of the front floor of the car is placed at a place where the upper part is placed, and is moved into the line body through the slide 1. After the first step of processing, the sheet metal parts are welded by the robot arm 3. After the welding is completed, the robot arm 3 on the other side of the slide 1 grabs the welded part for aerial repair welding. After the repair welding is completed, the robot arm 3 grabs the welded part and repairs the welded part again through the fixed welding clamp. After welding, the welded part is placed in the next step station; Then move the left and right front beams of the seats through the upper opening 2 to the slide fixture, grab the welded parts of the previous step through the mechanical arm 3 on one side of the slide 2, and grab the front beams of the mechanical arm 3 on the other side of the slide 2 to weld them in the air, and place them in the next station after welding is completed; Then, the left and right seat rear beams are moved to the slide fixture through the upper opening 3, and the left and right seat rear beams are grabbed by the mechanical arm 3 on one side of the slide 3, and the mechanical arm 3 on the other side of the slide 3 grabs the welded parts of the previous step for welding. After welding, they are placed on the repair welding fixture 5, and the welded parts are repaired by stud welding 4. After the repair welding is completed, the welded parts are fixed by the arc welding fixture 8, and finally the welded parts are finally processed by stud welding 4, and then placed in the lower opening 6 to wait for transportation; During the overall welding process of the above-mentioned automobile front floor, multi-station repair welding and aerial repair welding are adopted. The overall process flow is complete, including multiple welding processes such as spot welding, arc welding, and stud welding. No transportation is required during the process. The front floor can be welded in one go inside the line body, which greatly improves the process cycle and production. The whole line cycle reaches 40JPH.

[0025] like Figure 3 As shown, the transport device 7 includes an inclined support frame 71 fixed to the production line floor, one side of the inclined support frame 71 is an inclined surface, and an inclined plate 73 that can reciprocate along the inclined surface is provided inside the inclined support frame 71, both sides of the inclined plate 73 are fixedly connected with step plates 74, and both sides of the top surface of the inclined support frame 71 are fixedly connected with step plates 1 72, the treads of step plates 1 72 and step plates 2 74 are both inclined downward, and the treads of step plates 1 72 are fixedly connected with rollers 721; the finished product moves to the top surface of step plate 1 72 at the bottom, and ... When the step plate 2 74 reciprocates along the inclined support frame 71, the step plate 2 74 drives the finished product on the top surface of the step plate 1 72 to move upward. When the step plate 2 74 moves downward, the two ends of the finished product will contact the roller 721 on the top surface of the step plate 1 72 obliquely above. Since the treads of the step plates 1 72 and 2 74 are both inclined inward, the finished product can only move inside the riser surfaces of the step plates 1 72 and 2 74. Since the step plate 2 74 reciprocates, the finished product can only move along the climbing direction of the step plate 1 72.

[0026] like Figure 4 and Figure 5As shown, a guide rod 731 is fixedly connected to the bottom surface of the inclined plate 73, and a guide groove 716 adapted to the guide rod 731 is formed on the opposite side of the two step plates 72, and both ends of the guide rod 731 extend into the interior of the guide groove 716 respectively.

[0027] like Figure 4 As shown, one side of the inclined support frame 71 is fixedly connected to a driving motor 711, the output end of the driving motor 711 is fixedly connected to a bevel gear 1 712, the bevel gear 1 712 is meshingly connected to a bevel gear 2 713, and one side of the bevel gear 2 713 is provided with a connecting rod device for driving the inclined plate 73 to move.

[0028] like Figure 4 and Figure 5 As shown, the connecting rod device includes a transmission rod 714 fixed to one side of bevel gear 2 713, and the side of the transmission rod 714 away from the bevel gear 2 713 is fixedly connected to a circular plate 715, and the side of the circular plate 715 away from the transmission rod 714 is rotatably connected to a push rod 732, and the end of the push rod 732 away from the circular plate 715 is rotatably connected to the inclined plate 73, and the connection between the circular plate 715 and the push rod 732 is located on one side of the center of the circular plate 715; the bevel gear 1 712 is driven to rotate by the driving motor 711, and the bevel gear 1 712 drives the bevel gear 2 713 to rotate, and then drives the circular plate 715 to rotate. Since the circular plate 715 and one end of the push rod 732 are eccentrically designed, the push rod 732 pushes the inclined plate 73 to reciprocate, and then the inclined plate 73 drives the step plate 2 74 to reciprocate.

[0029] like Figure 5 and Figure 6 As shown, one side of the inclined support frame 71 is rotatably connected to a U-shaped frame 75, and the interior of the U-shaped frame 75 is rotatably connected to multiple rollers 76. The U-shaped frame 75 is composed of a horizontal bar and two longitudinal bars. The bottom surfaces of the two longitudinal bars are provided with a plurality of symmetrical insertion holes 751. One side of the inclined support frame 71 is rotatably connected to two support rods 77, and the top ends of the two support rods 77 are respectively inserted into the interior of the insertion holes 751. By inserting the support rods 77 into different insertion holes 751, the angle of the U-shaped frame 75 can be adjusted to facilitate communication with the collection box opening for containing finished products.

[0030] like Figure 3 As shown, a conveyor belt 78 fixedly connected to the workshop floor is provided on one side of the inclined support frame 71, two legs are provided on both sides of the conveyor belt 78, a cross plate 781 is fixedly connected between the two legs, and an intercepting rod 783 with adjustable height is provided on the top surface of the connecting plate.

[0031] like Figure 3As shown, both sides of the bottom surface of the intercepting rod 783 are rotatably connected with screw rods 782, and the screw rods 782 are threadedly connected to the cross plate 781. The bottom surface of the intercepting rod 783 is provided with two inclined rails 784, and the bottom surfaces of the two rails 784 are slidably connected to the conveyor belt 78. When the finished welding products are transferred to the top surface of the conveyor belt 78, the finished products are screened by the intercepting rod 783 to prevent the finished products from being stacked together, and are divided into single pieces, which is limited to only one piece passing through at a time.

[0032] The method of using the production line of the present invention comprises the following steps: S1, manually load the front floor body from the loading port 1, which is composed of the middle channel and the front floor side panels, and then the slide 1 is inserted into the line body. At this time, the robot arm 1 and the robot 2 on one side of the slide 1 and the welding gun weld the front floor sheet metal parts; S2, the robot arm 3 on the other side of the slide 1 grabs the front floor sheet metal part, and the robot arm 1 and the robot arm 2 on one side of the slide 1 perform aerial repair welding on the front floor sheet metal part. During the repair welding, the slide 1 slides out and waits for manual loading; the robot arm 3 on the other side of the slide 1 grabs the plate and uses the fixed welding clamp to perform repair welding on the front floor sheet metal part. After the repair welding is completed, the robot waits for the next step of waiting for the part to be released; S3, manual loading of parts at loading port 2, which are the front cross beams of the left and right seats, slide 2 is moved into the loading position on the gripper, and robot arm 3 places the front floor sheet metal parts on the slide fixture. After that, robot arm 3 is reset and waits for the next cycle. Robot arms 4 and 5 on one side of slide 2 perform positioning welding on the sheet metal parts on the slide fixture; S4, after the welding is completed, the slide 2 slides out and waits for manual loading. The robot arm 6 on the other side of the slide 2 grabs the sheet metal part. The robot arms 4 and 5 perform aerial repair welding on the front floor sheet metal part. After the aerial repair is completed, the robot arm 6 carries the front floor sheet metal part for fixed repair welding. After the welding is completed, it goes to the next station to wait for the part to be placed. S5, loading port 3 manually loads the parts, which are the rear cross beams of the left and right seats. After the parts are loaded on slide 3, they slide into the line body, and robotic arm 6 places the parts. After the parts are placed, robotic arm 6 returns to its original position and waits for the next cycle. Robot arms 7, 8, and 9 on one side of slide 3 weld the front floor sheet metal parts; S6, after the welding is completed, the robot arm 10 on the other side of the slide 3 grabs the front floor sheet metal, and the robot arms 7, 8, and 9 perform aerial repair welding on the front floor sheet metal. After the aerial repair welding is completed, the robot arm 10 grabs the front floor sheet metal for fixed repair welding. After the welding is completed, it is placed on the repair welding fixture 5; S7, the mechanical arm 11 and the mechanical arm 12 on one side of the repair welding fixture 5 perform repair welding on the front floor sheet metal part; S8, after the welding is completed, the stud weld 4 on one side of the repair welding fixture 5 is welded by the robot arm 13 grabbing the front floor sheet metal part. This station can weld a variety of different studs. After the welding is completed, the robot arm 13 places the front floor sheet metal part on the placement table, and then the robot arm 13 returns to its original position to wait for subsequent cycles; S9, the stud welding 4 on one side of the placement table 10 is carried out by the robot arm 14 grabbing the front floor sheet metal to weld the other side of the sheet metal. After the welding is completed, the robot arm 14 is placed on the front floor sheet metal arc welding fixture 8; S10, the robot arm 15 and the robot arm 16 on the other side of the placement table 10 perform arc welding on the sheet metal parts. After the welding is completed, the coding machine performs laser coding on the front floor panel. S11, the workpiece after laser coding is grabbed by the robot arm 17 on one side of the arc welding fixture 8 to the stud welding 4 for welding, and the welded front floor sheet metal is welded to the remaining studs. After welding, it is placed on the conveyor belt of the lower opening 6 to wait for transportation; S12, the finished products waiting for transfer are moved to the top surface of the conveyor belt 78, and the finished products are screened by the interception rod 783 to prevent the finished products from being stacked together, and are divided into individual pieces, limited to only one piece passing through at a time. Then the finished products are moved to the top surface of the bottom step plate 1 72, and at this time, the step plate 2 74 reciprocates along the inclined support frame 71, so that the workpieces can be transported along the step plate 1 72 in an orderly manner until they move to the top step plate 1 72, and are moved to the finished product box through the roller 76, and finally packed and collected.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible front floor welding production line, comprising a production line, characterized in that: The outer periphery of one side of the production line is provided with three loading ports (1), the three loading ports (1) are loading port 1, loading port 2, and loading port 3 from left to right, three slides (2) for transporting automobile front floor parts are fixedly installed inwardly of the openings of the three loading ports (1), the three slides (2) are respectively provided from left to right as slide 1, slide 2, and slide 3, and the three slides (2) correspond to the three loading ports (1) one by one, and a lowering port (6) is provided at one end of the lowering port (6), and an arc welding fixture is provided at one end of the lowering port (6). (8), a placement table (10) is provided at one end of the arc welding fixture (8) away from the lower opening (6), a repair welding fixture (5) is provided at one end of the placement table (10) away from the arc welding fixture (8), a transportation device (7) for transporting the front floor finished product is fixedly connected to the opening of the lower opening (6), the repair welding fixture (5), the arc welding fixture (8), and the placement table (10) are all provided with stud welding (4) on one side close to the production line, a PLC control box (9) is provided on one side of the production line, and a plurality of robot arms (3) are provided in the production line.

2. The flexible front floor welding production line according to claim 1 is characterized in that: The transport device (7) comprises an inclined support frame (71) fixed to the floor of the production line, one side of the inclined support frame (71) is an inclined surface, an inclined plate (73) is provided inside the inclined support frame (71) and can reciprocate along the inclined surface, both sides of the inclined plate (73) are fixedly connected to step plate 2 (74), both sides of the top surface of the inclined support frame (71) are fixedly connected to step plate 1 (72), the treads of step plate 1 (72) and step plate 2 (74) are both inclined downward, and the tread of step plate 1 (72) is fixedly connected to rollers (721).

3. The flexible front floor welding production line according to claim 2 is characterized in that: A guide rod (731) is fixedly connected to the bottom surface of the inclined plate (73), and a guide groove (716) adapted to the guide rod (731) is formed on an opposite side of one of the two step plates (72), and both ends of the guide rod (731) extend into the inside of the guide groove (716) respectively.

4. The flexible front floor welding production line according to claim 2 is characterized in that: A driving motor (711) is fixedly connected to one side of the inclined support frame (71), a bevel gear 1 (712) is fixedly connected to the output end of the driving motor (711), the bevel gear 1 (712) is meshingly connected to a bevel gear 2 (713), and a connecting rod device for driving the inclined plate (73) to move is provided on one side of the bevel gear 2 (713).

5. The flexible front floor welding production line according to claim 4 is characterized in that: The connecting rod device comprises a transmission rod (714) fixed to one side of bevel gear No. 2 (713); a side of the transmission rod (714) away from bevel gear No. 2 (713) is fixedly connected to a circular plate (715); a side of the circular plate (715) away from the transmission rod (714) is rotatably connected to a push rod (732); one end of the push rod (732) away from the circular plate (715) is rotatably connected to the inclined plate (73); and a connection between the circular plate (715) and the push rod (732) is located on one side of the center of the circular plate (715).

6. The flexible front floor welding production line according to claim 2 is characterized by: One side of the inclined support frame (71) is rotatably connected to a U-shaped frame (75), and the interior of the U-shaped frame (75) is rotatably connected to a plurality of rollers (76). The U-shaped frame (75) is composed of a horizontal bar and two longitudinal bars, and the bottom surfaces of the two longitudinal bars are provided with a plurality of symmetrical insertion holes (751). One side of the inclined support frame (71) is rotatably connected to two support rods (77), and the top ends of the two support rods (77) are respectively inserted into the interiors of the insertion holes (751).

7. The flexible front floor welding production line according to claim 2 is characterized by: A conveyor belt (78) fixedly connected to the workshop floor is provided on one side of the inclined support frame (71), two legs are provided on both sides of the conveyor belt (78), a horizontal plate (781) is fixedly connected between the two legs, and an intercepting rod (783) with adjustable height is provided on the top surface of the connecting plate.

8. The flexible front floor welding production line according to claim 7 is characterized by: Screw rods (782) are rotatably connected to both sides of the bottom surface of the intercepting rod (783), and the screw rods (782) are threadedly connected to the cross plate (781). Two inclined barrier rods (784) are provided on the bottom surface of the intercepting rod (783), and the bottom surfaces of the two barrier rods (784) are slidably connected to the conveyor belt (78).

9. The flexible front floor welding production line according to claim 1, characterized in that: Seventeen robotic arms (3) are arranged in the production line, and are numbered from robotic arm 1 to robotic arm 17, respectively. The seventeen robotic arms (3) are respectively interspersed in the interior of the production line.

10. A method for using a flexible front floor welding production line, applied to a flexible front floor welding production line as claimed in claim 9, characterized in that: The following steps are involved: S1, manually load the front floor body from the loading port 1, which is composed of the middle channel and the front floor side panels, and then the slide 1 is inserted into the line body. At this time, the robot arm 1 and the robot 2 on one side of the slide 1 and the welding gun weld the front floor sheet metal parts; S2, the robot arm 3 on the other side of the slide 1 grabs the front floor sheet metal part, and the robot arm 1 and the robot arm 2 on one side of the slide 1 perform aerial repair welding on the front floor sheet metal part. During the repair welding, the slide 1 slides out and waits for manual loading; the robot arm 3 on the other side of the slide 1 grabs the plate and uses the fixed welding clamp to perform repair welding on the front floor sheet metal part. After the repair welding is completed, the robot waits for the next step of waiting for the part to be released; S3, manual loading of parts at loading port 2, which are the front cross beams of the left and right seats, slide 2 is moved into the loading position on the gripper, and robot arm 3 places the front floor sheet metal parts on the slide fixture. After that, robot arm 3 is reset and waits for the next cycle. Robot arms 4 and 5 on one side of slide 2 perform positioning welding on the sheet metal parts on the slide fixture; S4, after the welding is completed, the slide 2 slides out and waits for manual loading. The robot arm 6 on the other side of the slide 2 grabs the sheet metal part. The robot arms 4 and 5 perform aerial repair welding on the front floor sheet metal part. After the aerial repair is completed, the robot arm 6 carries the front floor sheet metal part for fixed repair welding. After the welding is completed, it goes to the next station to wait for the part to be placed. S5, loading port 3 manually loads the parts, which are the rear cross beams of the left and right seats. After the parts are loaded on slide 3, they slide into the line body, and robotic arm 6 places the parts. After the parts are placed, robotic arm 6 returns to its original position and waits for the next cycle. Robot arms 7, 8, and 9 on one side of slide 3 weld the front floor sheet metal parts; S6, after the welding is completed, the robot arm 10 on the other side of the slide 3 grabs the front floor sheet metal, and the robot arms 7, 8, and 9 perform aerial repair welding on the front floor sheet metal. After the aerial repair welding is completed, the robot arm 10 grabs the front floor sheet metal and performs fixed repair welding. After the welding is completed, it is placed on the repair welding fixture (5); S7, the mechanical arm 11 and the mechanical arm 12 on one side of the repair welding fixture (5) perform repair welding on the front floor sheet metal component; S8, after the welding is completed, the stud weld (4) on one side of the repair welding fixture (5) is welded by the robot arm 13 grabbing the front floor sheet metal part. This station can weld a variety of different studs. After the welding is completed, the robot arm 13 places the front floor sheet metal part on the placement table, and then the robot arm 13 returns to its original position to wait for the subsequent cycle; S9, the stud welding (4) on one side of the placement table (10) is performed by grabbing the front floor sheet metal part through the robot arm 14 to weld the other side of the sheet metal part. After the welding is completed, the robot arm 14 is placed on the front floor sheet metal part arc welding fixture (8); S10, the robot arm 15 and the robot arm 16 on the other side of the placement table (10) perform arc welding on the sheet metal parts. After the welding is completed, the coding machine performs laser coding on the front floor panel. S11, the workpiece after laser coding is grasped by the robot arm 17 on one side of the arc welding fixture (8) to the stud welding (4) for welding, and the welded front floor sheet metal is welded to the remaining studs. After welding is completed, it is placed on the conveyor belt of the lower opening (6) to wait for transportation; S12, the finished products waiting to be transferred are moved to the top surface of the conveyor belt (78), and the finished products are screened by the interception rod (783) to prevent the finished products from being stacked together, and are divided into individual pieces, limited to only one piece passing through at a time, and then the finished products are moved to the top surface of the bottom step plate 1 (72). At this time, the step plate 2 (74) reciprocates along the inclined support frame (71), so that the workpieces can be transported along the step plate 1 (72) in an orderly manner until they move to the top step plate 1 (72), and are moved to the finished product box through the roller (76), and finally packed and collected.

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