A robot welding device and welding system for automobile anti-collision beams

Abstract

The present invention relates to the field of welding technology, and in particular to a robot welding device and welding system for an automobile anti-collision beam, comprising a turntable, the top of the turntable having two oppositely arranged and synchronously rotatable rotating ends; each of the rotating ends is fixed with a lifting assembly, and each of the lifting assemblies is fixed with a first clamp and a second clamp; the top of the second clamp is used to clamp and fix a sound-absorbing box; the lifting assembly is used to drive the second clamp to rise so that the top surface of the sound-absorbing box abuts against the bottom surface of the bow-shaped anti-collision beam; the present invention arranges two first clamps of the turntable for clamping and fixing one end of the bow-shaped anti-collision beam, the top of the second clamp is used for clamping and fixing the sound-absorbing box, and the lifting assembly is used to make the top surface of the sound-absorbing box abut against the bottom surface of the bow-shaped anti-collision beam, so that the welding channel of the welding device is relatively open and there are fewer obstacles, which is conducive to reducing the difficulty of designing the moving path of the welding gun.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to a robot welding device and a welding system for an automobile anti-collision beam. Background Art

[0002] The anti-collision system for new energy vehicles includes components such as an anti-collision beam, an energy absorption box, and a longitudinal beam. The anti-collision beam is typically formed from square tubes bent into a bow shape that matches the vehicle's front end. An energy absorption box is welded to the inner side of each end of the anti-collision beam. During welding, the anti-collision beam and energy absorption box are clamped to a welding fixture on a rotary table. A welding robot then welds the joint between the anti-collision beam and energy absorption box. The rotary table is used to flip the fixture to turn the workpiece over.

[0003] Currently, welding fixtures used for welding automotive anti-collision beams typically employ a base + clamp structure. For example, CN106736156B discloses a welding fixture for a front anti-collision beam assembly. The fixture comprises a base plate, an anti-collision beam clamping mechanism mounted on the base plate, an anti-collision beam positioning mechanism, an energy absorption box clamping mechanism, an energy absorption box positioning and ejection mechanism, and an operating platform mounted on the side of the base plate. These mechanisms utilize a pneumatic clamp structure.

[0004] As mentioned above, the existing welding fixture base is equipped with numerous clamps, with the crash beam and energy absorption box secured to the welding position via corresponding clamps. However, the excessive number of clamps and the large base surface result in a narrow welding path and numerous obstacles, making the design of the welding gun's movement path difficult. Summary of the Invention

[0005] In view of this, the present invention proposes a robot welding device and welding system for automobile anti-collision beams, which respectively clamp and fix one end of the bow-shaped anti-collision beam by setting two first clamps of a turntable, and the top of the second clamp is used to clamp and fix the sound-absorbing box, and the top surface of the sound-absorbing box is pressed against the bottom surface of the bow-shaped anti-collision beam through the lifting component, so that the welding channel of the welding device is relatively open and there are fewer obstacles, which is conducive to reducing the difficulty of designing the moving path of the welding gun, and solves the problems of the existing welding tooling that the welding channel is relatively narrow, there are many obstacles, and the design of the moving path of the welding gun is difficult.

[0006] The technical solution of the present invention is achieved as follows:

[0007] On the one hand, the present invention provides a robot welding device for an automobile anti-collision beam, comprising a turntable, a lifting assembly, a first clamp and a second clamp, wherein:

[0008] The top of the turntable has two rotating ends that are arranged opposite to each other and can rotate synchronously;

[0009] A lifting assembly is fixed on each of the rotating ends, and a first clamp and a second clamp are fixed on each of the lifting assemblies;

[0010] The two first clamps are respectively used to clamp and fix one end of the arched anti-collision beam, and the top of the second clamp is used to clamp and fix the sound absorbing box;

[0011] The lifting assembly is used to drive the second clamp to rise so that the top surface of the sound absorbing box abuts against the bottom surface of the arched anti-collision beam.

[0012] On the basis of the above technical solution, preferably, the first fixture includes a support block, an eccentric wheel, a slider, a first motor and a second motor, wherein,

[0013] The support block is fixedly connected to the lifting assembly, the interior of the support block is hollow, and the top surface of the support block is set as an arc surface, the arc surface is in contact with the arc bottom surface of the arched anti-collision beam, and the top of the support block is opened;

[0014] The eccentric wheel is arranged along the Y direction, and the eccentric wheel is rotatably arranged inside the support block;

[0015] The slider is slidably arranged on the top of the support block, and the slider can only slide along the circumferential direction of the arc-shaped surface on the top of the support block;

[0016] The first motor is fixed inside the support block, and is used to drive one end of the slider to extend into the pipe opening at the end of the arched anti-collision beam, and to make the extended end of the slider downwardly abut against the inner wall of the bottom of the arched anti-collision beam;

[0017] The second motor is fixed inside the support block, and is used to drive one end of the eccentric wheel to pass through the opening to support the bottom surface of the arched anti-collision beam.

[0018] On the basis of the above technical solution, preferably, a central shaft is fixed at each end of the eccentric wheel, wherein:

[0019] The two central shafts penetrate the side walls of the support block and are rotatably connected;

[0020] A paddle is fixed to the top of the outer ends of the two central shafts respectively;

[0021] One end of the two paddles close to the slider is parallel to each other, and the distance between the two parallel ends of the paddles is equal to the axial width of the arched anti-collision beam, and the other ends of the two paddles are bent in a horizontal direction away from the support block.

[0022] On the basis of the above technical solution, preferably, a protrusion is provided at one end of the sliding block close to the arched anti-collision beam, and a wedge-shaped surface is provided at the bottom of the protrusion.

[0023] On the basis of the above technical solution, preferably, the first fixture further includes a first gear, wherein,

[0024] The output shaft of the first motor passes through the side wall of the support block;

[0025] The first gear is arranged outside the support block and fixed on the output shaft of the first motor;

[0026] A first tooth groove is provided at the bottom of the slider and at a position corresponding to the first gear, and the first tooth groove is engaged with the first gear;

[0027] A linear rail is fixed to the side of the support block, and the linear rail extends along the arc of the arched anti-collision beam;

[0028] A sliding groove is provided at the bottom of the sliding block, and the linear rail is slidably arranged on the inner side of the sliding groove.

[0029] On the basis of the above technical solution, preferably, the first fixture further includes a second gear, wherein,

[0030] The second gear is fixed on the output shaft of the second motor;

[0031] The side of the eccentric wheel is provided with a second tooth groove;

[0032] The second gear meshes with the second tooth groove.

[0033] On the basis of the above technical solution, preferably, the lifting assembly includes a bracket and a linear motor, wherein,

[0034] One side of the bracket is fixedly connected to the rotary end, the other side is fixedly connected to the linear motor, and the top of the bracket is fixedly connected to the support block;

[0035] The linear motor is vertically arranged, and the output end of the linear motor is fixedly connected to the second clamp.

[0036] On the basis of the above technical solution, preferably, the lifting assembly further includes a guide rod, wherein:

[0037] The guide rod vertically passes through the output end of the linear motor;

[0038] The upper end of the guide rod is fixedly connected to the top of the bracket.

[0039] On the basis of the above technical solution, preferably, the second clamp includes a parallel cylinder, a clamping finger and a positioning seat, wherein,

[0040] The parallel cylinder is arranged along the Y direction, and the parallel cylinder is fixed on the output end of the linear motor;

[0041] The gripping finger is fixed with one on the output end of each of the parallel cylinders;

[0042] The positioning seat is fixed on the top of the parallel cylinder, and a positioning pin is fixed on the top of the positioning seat.

[0043] On the other hand, the present invention also provides a car anti-collision beam robot welding system, including the above-mentioned car anti-collision beam robot welding device, and also includes a welding robot and a loading robot, wherein,

[0044] The welding robot and the loading robot are symmetrically arranged on both sides of the turntable.

[0045] The automotive anti-collision beam robot welding device and welding system of the present invention have the following beneficial effects compared with the prior art:

[0046] (1) The two first clamps of the turntable are respectively used to clamp and fix one end of the arched anti-collision beam, and the top of the second clamp is used to clamp and fix the sound absorbing box. The top surface of the sound absorbing box is pressed against the bottom surface of the arched anti-collision beam through the lifting assembly, so that the welding device can be turned over. Compared with the existing welding tooling, there is no dual constraint of the pneumatic clamp and the base, so that there are fewer obstacles on the welding device of the present invention, the welding channel is open, which is conducive to reducing the difficulty of designing the moving path of the welding gun.

[0047] (2) By providing a wedge-shaped surface, it is convenient to use the wedge-shaped surface to press against the pipe mouth of the anti-collision beam, and then it is convenient to achieve horizontal and vertical clamping of the anti-collision beam through the cooperation of the eccentric wheel and the wedge-shaped surface, thereby improving the firmness of the workpiece after fixation. At the same time, the top surface of the sound-absorbing box presses against the bottom surface of the arched anti-collision beam through the lifting component, thereby achieving a tight connection between the sound-absorbing box and the anti-collision beam, making the two workpieces more firmly fixed, which is conducive to improving the quality of the product after welding.

[0048] (3) By setting the two picks to be parallel to each other at one end close to the slider, and the spacing between the two parallel ends of the picks is equal to the axial width of the bow-shaped anti-collision beam, the other ends of the two picks are bent in the horizontal direction away from the support block, so that the anti-collision beam to be placed inside the two picks can be guided by the bent portion of the picks, so that the two ends of the anti-collision beam can be placed on the top of the support block at the corresponding position more smoothly, and then the picks are driven to deflect by the eccentric wheel, so that the bent portion of the picks guides the anti-collision beam to enter between the two parallel ends of the picks, thereby realizing the Y-direction positioning of the anti-collision beam, and then the wedge surface is pressed against the two ends of the anti-collision beam by sliding the slider, realizing the X-direction and Z-direction positioning and clamping of the anti-collision beam, at the same time, the sound absorbing box is positioned by the clamping fingers and the positioning pins, and then the top surface of the sound absorbing box is pressed against the bottom surface of the bow-shaped anti-collision beam by the lifting component, realizing the X-direction positioning and clamping of the sound absorbing box, and the entire positioning and clamping process is relatively fast and accurate, which is conducive to improving the welding efficiency and the quality of the product after welding.

[0049] (4) By setting the slider to slide only along the circumferential direction of the arc surface at the top of the support block, the wedge surface moves along the arc path, which can ensure that the wedge surface is in good contact with the pipe mouth at the end of the anti-collision beam to achieve benign resistance. At the same time, the anti-collision beam can slide and displace on the arc surface at the top of the support block to ensure that the arc surface at the top of the support block is in good contact with the arc surface at the bottom of the anti-collision beam at all times, so that the position of the anti-collision beam after being fixed is more accurate, which is conducive to improving the quality of the product after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 A perspective view of a robot welding system for an automobile anti-collision beam according to the present invention;

[0052] Figure 2 A perspective view of a robotic welding system for an automobile anti-collision beam according to the present invention from another perspective;

[0053] Figure 3 For the present invention Figure 1 A magnified view of point A;

[0054] Figure 4 Schematic diagram of the internal structure of the support block of the present invention;

[0055] Figure 5 A perspective view of a robot welding device for an automobile anti-collision beam according to the present invention;

[0056] Figure 6 A partial perspective view of a robot welding device for an automobile anti-collision beam according to the present invention;

[0057] Figure 7 A partial side view of a robot welding device for an automobile anti-collision beam according to the present invention;

[0058] Figure 8 This is a three-dimensional picture of the bow-shaped anti-collision beam and the sound-absorbing box after welding;

[0059] Figure 9 is a three-dimensional view of the second tooth groove;

[0060] In the figure: 1. Turntable; 2. Lifting assembly; 3. First fixture; 4. Second fixture; 5. Welding robot; 6. Loading robot; 7. Bow-shaped anti-collision beam; 8. Sound-absorbing box; 21. Bracket; 22. Linear motor; 23. Guide rod; 31. Support block; 32. Eccentric wheel; 33. Slider; 34. First motor; 35. Second motor; 36. First gear; 37. Second gear; 41. Parallel cylinder; 42. Clamping finger; 43. Positioning seat; 101. Rotating end; 321. Center axis; 322. Pick; 3101. Opening; 3102. Linear rail; 3201. Second tooth groove; 3301. Protrusion; 3302. Wedge surface; 3303. First tooth groove; 3304. Slide groove; 4301. Positioning pin. DETAILED DESCRIPTION

[0061] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0062] like Figure 1-9 As shown, a robot welding system for automobile anti-collision beams of the present invention is mainly used for the automated welding operation of anti-collision beams of new energy vehicles. The system mainly includes a robot welding device for automobile anti-collision beams, a welding robot 5 and a loading robot 6.

[0063] The loading robot 6 is used to place the sound absorbing box 8 and the arched anti-collision beam 7 onto the robotic welding device for the automotive anti-collision beam. The robotic welding device for the automotive anti-collision beam is used to clamp and secure the sound absorbing box 8 and the arched anti-collision beam 7. After securing, the welding robot 5 welds the sound absorbing box 8 and the arched anti-collision beam 7 together. After welding, the loading robot 6 unloads the parts.

[0064] like Figure 8As shown, the main body of the bow-shaped anti-collision beam 7 is a square tube structure, which is made into a bow shape by bending sheet metal.

[0065] like Figure 5 As shown, the automobile anti-collision beam robot welding device in the system includes a turntable 1, a lifting component 2, a first clamp 3 and a second clamp 4.

[0066] The turntable 1 is used to flip the workpiece to assist the welding robot 5 in welding. Figure 1 As shown, a welding robot 5 is provided on one side of the turntable 1 , and a loading robot 6 is provided on the other side. The welding robot 5 and the loading robot 6 are symmetrically distributed.

[0067] like Figure 5 As shown, the turntable 1 includes a mounting base for connecting to the ground, with a column fixed on each side of the top of the mounting base, and the column height is greater than the rotation radius of the workpiece. A rotating shaft is set on the top of the column. The rotating shaft is set horizontally, and one end of it is set as the input end for connecting to the rotating motor, and the rotating motor is fixed to the column. The other end of the rotating shaft is set as the rotating end 101 for connecting to the lifting component 2. Figure 1 and Figure 3 The two rotating ends 101 of the turntable 1 are arranged relative to each other and can rotate synchronously, and the vertical flipping of the workpiece is achieved by rotation.

[0068] The lifting assembly 2 is used to lift the sound absorbing box 8, such as Figure 1-2 As shown, a first clamp 3 and a second clamp 4 are fixed to the lifting assembly 2. The two first clamps 3 are used to clamp and secure one end of the arched anti-collision beam 7, and the top of the second clamp 4 is used to clamp and secure the sound absorbing box 8. Before welding, the lifting assembly 2 drives the second clamp 4 to rise so that the top surface of the sound absorbing box 8 abuts the bottom surface of the arched anti-collision beam 7, completing the pre-fixation of the sound absorbing box 8 and the arched anti-collision beam 7. Specifically, during welding, the sound absorbing box 8 is first grabbed by the loading robot 6 and placed on the top of the second clamp 4. The sound absorbing box 8 is then clamped and fixed by the second clamp 4. The bow-shaped anti-collision beam 7 is then grabbed by the loading robot 6 and placed on the top of the first clamp 3. The two ends of the bow-shaped anti-collision beam 7 are then clamped and fixed by the first clamp 3. The second clamp 4 is then driven to rise by the lifting assembly 2 so that the top surface of the sound absorbing box 8 is against the bottom surface of the bow-shaped anti-collision beam 7. After abutting, the connection gap between the sound absorbing box 8 and the bow-shaped anti-collision beam 7 is welded by the welding robot 5.

[0069] like Figure 3-7 As shown, the first clamp 3 includes a support block 31 , an eccentric wheel 32 , a slider 33 , a first motor 34 and a second motor 35 .

[0070] The support block 31 is used to support both ends of the arched anti-collision beam 7. The interior of the support block 31 is hollow, and an opening 3101 is provided on the top thereof. The opening 3101 is used for one end of the eccentric wheel 32 to enter and exit the support block 31. Figure 4 As shown, the top surface of the support block 31 is configured as an arcuate surface, which aligns with the arcuate bottom surface of the arched anti-collision beam 7. Specifically, the virtual arc of this arcuate surface is concentric with the virtual arc of the bottom arcuate surface of the arched anti-collision beam 7 and has the same radius. When the first clamp 3 performs a clamping action, the arched anti-collision beam 7 can slide on the top surface of the support block 31, and the virtual arc of the arcuate surface serves as the sliding path during sliding. In addition, the bottom of the support block 31 is fixedly connected to the lifting assembly 2.

[0071] like Figure 4 As shown, the first motor 34 is fixed inside the support block 31, and is used to drive one end of the slider 33 to extend into the pipe opening at the end of the arched anti-collision beam 7, and to make the extended end of the slider 33 press downward against the inner wall of the bottom of the arched anti-collision beam 7. Figure 3 and Figure 6 The slider 33 is slidably mounted on top of the support block 31 and can only slide circumferentially along the curved surface of the support block 31. A protrusion 3301 is provided on the end of the slider 33 proximal to the arched anti-collision beam 7, and a wedge-shaped surface 3302 is provided at the bottom of the protrusion 3301. When the arched anti-collision beam 7 is to be clamped, the first motor 34 drives the slider 33 to slide, causing the protrusion 3301 to extend into the tube opening of the arched anti-collision beam 7 and the wedge-shaped surface 3302 to abut against the inner wall of the tube opening, achieving a holding effect.

[0072] like Figure 4 As shown, the second motor 35 is fixed inside the support block 31 and is used to drive the eccentric wheel 32 to rotate. The eccentric wheel 32 is arranged on one side of the second motor 35 and is arranged along the Y direction and rotatably arranged inside the support block 31. When the second motor 35 drives the eccentric wheel 32 to rotate, one end of the eccentric wheel 32 passes through the opening 3101 to support the bottom surface of the arched anti-collision beam 7. Specifically, the eccentric wheel 32 has a small diameter end and a large diameter end. A second gear 37 is fixed to the output shaft of the second motor 35. A plurality of second tooth grooves 3201 are provided on the side of the large diameter end of the eccentric wheel 32 along a fan-shaped path. The second gear 37 meshes with the second tooth grooves 3201. When the second motor 35 drives the large diameter end of the eccentric wheel 32 to deflect, the small diameter end of the eccentric wheel 32 moves out of the support block 31 from the opening 3101 and presses upward against the bottom surface of the bow-shaped anti-collision beam 7. During this process, the wedge surface 3302 presses obliquely downward against the pipe mouth of the bow-shaped anti-collision beam 7 to achieve clamping and fixation of the bow-shaped anti-collision beam 7.

[0073] In addition, a central shaft 321 is fixed at each end of the eccentric wheel 32. Figure 6As shown, the two central shafts 321 pass through the side wall of the support block 31 and are rotatably connected. A paddle 322 is fixed to the top of each outer end of the two central shafts 321. The ends of the two paddles 322 close to the slider 33 are parallel to each other, and the distance between the two parallel ends of the paddles 322 is equal to the axial width of the arched anti-collision beam 7. Figure 7 As shown, the other ends of the two paddles 322 are bent in a horizontal direction away from the support block 31 .

[0074] Before placing the arched anti-collision beam 7, Figure 7 As shown, the bent parts of the two paddles 322 are facing upward and in a V-shaped open state. When the bow-shaped anti-collision beam 7 is placed, the bow-shaped anti-collision beam 7 is placed on the top surface of the support block 31 between the two paddles 322. After placement, the eccentric wheel 32 deflects, driving the paddles 322 to deflect. During the process, the opposite ends of the two paddles 322 guide the bow-shaped anti-collision beam 7, correcting the bow-shaped anti-collision beam 7 so that it is finally positioned between the two parallel ends of the two paddles 322, thereby realizing the positioning of the bow-shaped anti-collision beam 7.

[0075] like Figure 6 As shown, the output shaft of the first motor 34 passes through the side wall of the support block 31. A first gear 36 is provided on the outside of the support block 31, and the first gear 36 is fixed to the output shaft of the first motor 34. A first tooth groove 3303 is provided at the bottom of the slider 33 and at the position corresponding to the first gear 36, and the first tooth groove 3303 is engaged with the first gear 36. A linear rail 3102 is fixed to the side of the support block 31, and the linear rail 3102 extends along the arc of the arched anti-collision beam 7. A slide groove 3304 is provided at the bottom of the slider 33, and the linear rail 3102 is slidably provided on the inner side of the slide groove 3304.

[0076] The support block 31 extends downward at both ends in the Y direction, forming an inverted U-shaped structure. The first tooth grooves 3303 and the slide grooves 3304 are provided in the downwardly extending portion of the support block 31. Furthermore, a plurality of first tooth grooves 3303 are provided at equal intervals along a virtual arc on the top curved surface of the support block 31, and the linear rails 3102 and the slide grooves 3304 extend along this virtual arc.

[0077] In the above structure, the first motor 34 and the second motor 35 are both dual-axis motors. Figure 9 As shown, a first gear 36 is provided on each of the two output ends of the first motor 34, and a second gear 37 is provided on each of the two output ends of the second motor 35. Accordingly, two rows of second tooth grooves 3201 and slide grooves 3304 are provided to improve the driving effect and thus improve the clamping effect.

[0078] like Figure 3As shown, the lifting assembly 2 includes a bracket 21, a linear motor 22, and a guide rod 23. One side of the bracket 21 is fixedly connected to the rotating end 101, the other side is fixedly connected to the linear motor 22, and the top of the bracket 21 is fixedly connected to the support block 31. The linear motor 22 is vertically arranged, and the output end of the linear motor 22 is fixedly connected to the second clamp 4. The guide rod 23 vertically extends through the output end of the linear motor 22, and the upper end of the guide rod 23 is fixedly connected to the top of the bracket 21.

[0079] Figure 3 In the embodiment, the support 21 includes a vertical plate and two horizontal plates. One of the horizontal plates is fixed to the top of the vertical plate for supporting and fixing the support block 31. The other horizontal plate is fixed to the side of the vertical plate for fixing and connecting the rotating end 101 of the turntable 1.

[0080] like Figure 3 As shown, the second fixture 4 includes a parallel cylinder 41, a clamping finger 42 and a positioning seat 43, wherein: the parallel cylinder 41 is arranged along the Y direction and is fixed to the output end of the linear motor 22; a clamping finger 42 is fixed to the output end of each parallel cylinder 41; the positioning seat 43 is fixed to the top of the parallel cylinder 41, and a positioning pin 4301 is fixed to the top of the positioning seat 43. The positioning pin 4301 matches the bolt mounting hole at the bottom of the sound absorbing box 8. When the loading robot 6 installs the sound absorbing box 8 on the second fixture 4, the bolt mounting hole at the bottom of the sound absorbing box 8 is plugged into the positioning pin 4301 to achieve positioning, and then the clamping finger 42 is driven by the parallel cylinder 41 to perform a clamping action to clamp and fix the sound absorbing box 8.

[0081] The use method of the automobile anti-collision beam robot welding device and welding system of the present invention is as follows:

[0082] First, the loading robot 6 places the sound-absorbing box 8 on the second fixture 4, which then clamps and secures it. The loading robot 6 then places the arched anti-collision beam 7 on the first fixture 3, which then clamps and secures it. After loading, the lifting assembly 2 drives the second fixture 4 upward, raising the top surface of the sound-absorbing box 8 against the bottom surface of the arched anti-collision beam 7, thus pre-fixing the sound-absorbing box 8 and the arched anti-collision beam 7. After securing, the welding robot 5 welds the joint between the sound-absorbing box 8 and the arched anti-collision beam 7. The loading robot 6 unloads the material during and after welding.

[0083] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A robot welding device for an automobile anti-collision beam, comprising a turntable (1), characterized in that: It also includes a lifting assembly (2), a first clamp (3) and a second clamp (4), wherein: The top of the turntable (1) has two rotating ends (101) that are arranged opposite to each other and can rotate synchronously, and each of the rotating ends (101) is fixed with a lifting assembly (2), and each of the lifting assemblies (2) is fixed with a first clamp (3) and a second clamp (4); The two first clamps (3) are respectively used to clamp and fix one end of the bow-shaped anti-collision beam (7), and the top of the second clamp (4) is used to clamp and fix the sound absorbing box (8); The lifting assembly (2) is used to drive the second clamp (4) to rise so that the top surface of the sound absorbing box (8) abuts against the bottom surface of the arched anti-collision beam (7); The first fixture (3) comprises a support block (31), an eccentric wheel (32), a slider (33), a first motor (34) and a second motor (35), wherein: The support block (31) is fixedly connected to the lifting assembly (2), the interior of the support block (31) is hollow, and the top surface of the support block (31) is set as an arc surface, the arc surface is in contact with the arc bottom surface of the arched anti-collision beam (7), and the top of the support block (31) is provided with an opening (3101); The eccentric wheel (32) is arranged along the Y direction, and the eccentric wheel (32) is rotatably arranged inside the support block (31); The slider (33) is slidably arranged on the top of the support block (31), and the slider (33) can only slide along the circumferential direction of the arc-shaped surface at the top of the support block (31); The first motor (34) is fixed inside the support block (31), and the first motor (34) is used to drive one end of the slider (33) to extend into the pipe opening at the end of the arched anti-collision beam (7), and to make the extended end of the slider (33) press downward against the inner wall of the bottom of the arched anti-collision beam (7); The second motor (35) is fixed inside the support block (31), and the second motor (35) is used to drive one end of the eccentric wheel (32) to pass through the opening (3101) to support the bottom surface of the arched anti-collision beam (7); A central shaft (321) is fixed to each of the two ends of the eccentric wheel (32), wherein: The two central shafts (321) pass through the side walls of the support block (31) and are rotatably connected, and a paddle (322) is fixed to the top of the outer ends of the two central shafts (321); One end of the two paddles (322) close to the slider (33) is parallel to each other, and the distance between the two parallel ends of the paddles (322) is equal to the axial width of the arched anti-collision beam (7), and the other ends of the two paddles (322) are bent in a horizontal direction away from the support block (31).

2. The robot welding device for automobile anti-collision beams according to claim 1, characterized in that: A protrusion (3301) is provided at one end of the slider (33) close to the arched anti-collision beam (7), and a wedge-shaped surface (3302) is provided at the bottom of the protrusion (3301).

3. The robot welding device for automobile anti-collision beams according to claim 1, characterized in that: The first clamp (3) further comprises a first gear (36), wherein: The output shaft of the first motor (34) passes through the side wall of the support block (31); The first gear (36) is arranged outside the support block (31) and fixed on the output shaft of the first motor (34); A first tooth groove (3303) is provided at the bottom of the slider (33) and at a position corresponding to the first gear (36), and the first tooth groove (3303) is meshed with the first gear (36); A linear rail (3102) is fixed to the side of the support block (31), and the linear rail (3102) extends along the arc of the arched anti-collision beam (7); A sliding groove (3304) is provided at the bottom of the slider (33), and the linear rail (3102) is slidably arranged on the inner side of the sliding groove (3304).

4. The robot welding device for automobile anti-collision beams according to claim 1, characterized in that: The first clamp (3) further comprises a second gear (37), wherein: The second gear (37) is fixed on the output shaft of the second motor (35); A second tooth groove (3201) is provided on the side of the eccentric wheel (32); The second gear (37) is meshed with the second tooth groove (3201).

5. The robot welding device for automobile anti-collision beams according to claim 1, characterized in that: The lifting assembly (2) comprises a bracket (21) and a linear motor (22), wherein: One side of the bracket (21) is fixedly connected to the rotary end (101), and the other side is fixedly connected to the linear motor (22); the top of the bracket (21) is fixedly connected to the support block (31); The linear motor (22) is arranged vertically, and the output end of the linear motor (22) is fixedly connected to the second clamp (4).

6. The robot welding device for automobile anti-collision beams according to claim 5, characterized in that: The lifting assembly (2) further includes a guide rod (23), wherein: The guide rod (23) vertically penetrates the output end of the linear motor (22); The upper end of the guide rod (23) is fixedly connected to the top of the bracket (21).

7. The robot welding device for automobile anti-collision beams according to claim 5, characterized in that: The second clamp (4) comprises a parallel cylinder (41), a clamping finger (42) and a positioning seat (43), wherein: The parallel cylinder (41) is arranged along the Y direction, and the parallel cylinder (41) is fixed on the output end of the linear motor (22); The clamping finger (42) is fixed on the output end of each of the parallel cylinders (41); The positioning seat (43) is fixed on the top of the parallel cylinder (41), and a positioning pin (4301) is fixed on the top of the positioning seat (43).

8. A robot welding system for automobile anti-collision beams, characterized by: The invention comprises the automobile anti-collision beam robot welding device according to any one of claims 1 to 7, and further comprises a welding robot (5) and a loading robot (6), wherein: The welding robot (5) and the loading robot (6) are symmetrically arranged on both sides of the turntable (1).

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