An automatic welding system for automobile bumper beam assembly

Abstract

The present invention relates to the field of bumper processing technology, and specifically to an automatic welding system for an automobile bumper beam assembly, comprising a welding base, a welding robot mounted on the welding base, two left-right symmetrical clamping units mounted on the upper side of the welding base, the clamping units being used to clamp the beam, and two left-right symmetrically arranged positioning units mounted on the upper side of the welding base, the positioning units being mounted with a calibration unit. The present invention positions the ends of the beam by the positioning units, and simultaneously adjusts the position of the energy absorption box according to the distance between the preset welding area of ​​the beam and the corresponding end by setting an adjustment group. Thus, when welding beam assemblies of different specifications, the energy absorption box and the preset welding area of ​​the beam can be accurately aligned, thereby ensuring the quality of the welded beam assembly.

Description

Technical Field

[0001] The invention relates to the technical field of bumper processing, in particular to an automatic welding system for an automobile bumper crossbeam assembly. Background Art

[0002] Automobile bumper beam assembly is the core component of vehicle passive safety system, such as Figure 10 As shown, the crossbeam assembly is mainly composed of a crossbeam body, an energy absorption box and a connecting bracket. The crossbeam is usually stamped into an arc-shaped or special-shaped cross-section structure using high-strength steel plates, and its two ends are welded and fixed to the energy absorption box.

[0003] Currently, when welding a beam assembly, the energy absorption box is usually placed manually in the preset welding area of ​​the beam, and then the energy absorption box and the beam are mechanically locked by a clamping mold. The energy absorption box and the beam are then welded together by a welding robot. Finally, the clamping mold is controlled to release the energy absorption box and the beam, and the welded beam assembly is removed to complete the welding of the beam assembly.

[0004] However, the following problems exist in the welding process of the above-mentioned beam assembly: 1. The welding positioning of the energy absorption box is inaccurate: the traditional clamping mold is a rigid integral design, which is only suitable for energy absorption boxes of a single specification. When welding beam assemblies of different specifications, the clamping mold needs to be replaced and the position adjusted. Moreover, when manually adjusting the welding position of the energy absorption box adapted to beam assemblies of different specifications on the beam, positioning deviation may be caused, which in turn affects the quality of the beam assembly after welding.

[0005] 2. There is a welding gap: Since the beam is often an arc-shaped structure, the welding surface of the beam and the energy absorption box is usually an arc-shaped surface. When welding the beam and the energy absorption box, the energy absorption box and the beam may not fit tightly, resulting in a welding gap, which in turn reduces the welding quality. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: an automatic welding system for an automobile bumper beam assembly, comprising a welding base, a welding robot installed on the welding base, two left-right symmetrical clamping units installed on the upper side of the welding base, the clamping units are used to clamp the beam, and two left-right symmetrically arranged positioning units are also installed on the upper side of the welding base, and a calibration unit is installed on the positioning unit.

[0007] The upper side of the welding base is provided with a guide groove corresponding to the positioning unit one by one. The positioning unit includes a sliding plate connected to the guide groove for left and right sliding through an active part. Positioning plates are installed on the opposite sides of the two sliding plates through multiple pressure springs evenly arranged up and down. The positioning plates are also installed in the guide groove for left and right sliding.

[0008] The alignment unit includes a transmission block that slides up and down on opposite sides of two positioning plates via a spring. Adjustment groups are mounted on opposite sides of each transmission block. These adjustment groups are equipped with a clamping group for vertically clamping the energy absorbing box. The adjustment group is used to adjust the position of the energy absorbing box held by the clamping group according to the weld position on the crossbeam. A linkage group is connected between the transmission block, the positioning plate, and the sliding plate. When the positioning plate is in contact with the end of the crossbeam and the sliding plate continues to move, the linkage group, through the transmission block, ultimately drives the energy absorbing box downward to press against the upper side of the crossbeam.

[0009] Preferably, the clamping unit includes two U-shaped seats fixedly mounted on the upper side of the welding base and arranged on opposite sides thereof, and the U-shaped seats are located on opposite sides of the two positioning plates, and the front and rear inner walls of the U-shaped seats are both slidably mounted with clamping blocks through a plurality of elastic clamping rods evenly arranged on the left and right, and the upper ends of the opposite sides of the two clamping blocks are both set to inclined surfaces, and a plurality of elastic clamping rods corresponding to the same clamping block slide back and forth through the U-shaped seat and are jointly fixedly mounted with a square plate, and a plurality of locking rods evenly arranged on the left and right are fixedly mounted on the lower end of the square plate.

[0010] Preferably, a locking group is installed at the position corresponding to the square plate on the upper end of the welding base, and the locking group includes a locking plate installed on the upper side of the welding base through a plurality of elastic support rods. The locking plate is provided with a plurality of locking grooves evenly arranged front and back at the position corresponding to the locking rod, and the locking groove is used to cooperate with the corresponding locking rod to lock the square plate.

[0011] Preferably, a lifting plate is installed on the upper side of the welding base for sliding left and right, and is located on the back side of the left and right locking plates. The upper end of the lifting plate close to the middle of the welding base is provided with an inclined surface that cooperates with the locking plate. A reset spring is connected between the lifting plate and the welding base, and L-shaped plates for pushing the corresponding lifting plates are fixedly installed at both ends of the sliding plate.

[0012] Preferably, the adjustment group includes a fixed plate fixedly installed on the opposite sides of the two transmission blocks, U-shaped adjustment plates are distributed on the opposite sides of the two fixed plates, support guide rods are fixedly installed on the rear ends of the two adjustment plates on opposite sides, and the support guide rods and the fixed plates are connected for left and right sliding connection, and adjustment screws are rotatably installed on the front ends of the two adjustment plates on opposite sides, and the adjustment screws are threadedly connected to the corresponding fixed plates.

[0013] Preferably, the clamping group includes clamping blocks that are installed to slide back and forth on the front and rear inner walls of the adjustment plate through multiple elastic push rods evenly arranged on the left and right. The ends of the opposite sides of the two clamping blocks close to the middle of the welding base are both set to inclined surfaces. Multiple elastic push rods corresponding to the same clamping block slide back and forth through the adjustment plate and are jointly fixed with a matching plate, and a round rod is fixedly installed on the side of the matching plate away from the middle of the welding base.

[0014] Preferably, sliding plates are installed on the front and rear sides of the adjustment plate and at one end away from the middle of the welding base for sliding left and right sliding. A guide spring is connected between the sliding plate and the adjustment plate. A plurality of circular holes evenly arranged front and back are opened on the sliding plate, and the circular holes are used to cooperate with corresponding round rods to lock the matching plate. L-shaped pushing rods are fixedly installed at the positions corresponding to the sliding plates on the front and rear sides of the sliding plate, and the horizontal transverse section of the pushing rod is set to an elastic telescopic structure. A pushing plate is fixedly installed on one end of the pushing rod close to the middle of the welding base.

[0015] Preferably, the clamping group further comprises a positioning plate mounted on the upper side of the adjustment plate for sliding up and down movement via a plurality of elastic downward pressing rods, and the lower end of one side of the positioning plate close to the middle of the welding base is set as an inclined surface.

[0016] Preferably, the linkage group includes a linkage plate fixedly mounted on the upper end of the transmission block, and the upper end of the linkage plate slides up and down through the positioning plate, square shells are fixedly mounted on the upper ends of the opposite sides of the two sliding plates, and lower pressure plates are mounted on the opposite sides of the two square shells for sliding left and right through connecting springs, and the lower ends of the opposite sides of the two lower pressure plates are set to inclined surfaces that match the linkage plate, and the inclined surfaces of the lower pressure plates are in contact with the upper ends of the linkage plates.

[0017] Preferably, elastic limit rods are installed on the front and rear inner walls of the square shell on one side close to the middle of the welding base for sliding forward and backward, and the elastic limit rods are arranged in contact with the lower pressure plate, and limiting grooves are provided on the front and rear sides of the lower pressure plate and on the side close to the middle of the welding base. The limiting grooves are used to cooperate with the elastic limit rods to limit the position of the lower pressure plate, and the opposite sides of the two elastic limit rods and the ends away from the middle of the welding base are both set as inclined surfaces.

[0018] The beneficial effects of the present invention are: 1. The present invention positions the end of the beam through the positioning unit and can adapt to beam assemblies of different specifications. At the same time, by setting an adjustment group, the position of the energy absorption box is adjusted according to the distance between the preset welding area of ​​the beam and the corresponding end. Therefore, when welding beam assemblies of different specifications, the energy absorption box and the preset welding area of ​​the beam can be ensured to be accurately aligned, thereby ensuring the quality of the beam assembly after welding.

[0019] 2. The present invention vertically clamps the energy absorbing box by setting a clamping group, and at the same time presses the energy absorbing box downward against the crossbeam by setting a linkage group, and arranges the two preset welding areas of the crossbeam symmetrically with the middle of the welding base as the reference, to ensure that the welding surface of the energy absorbing box and the welding surface of the crossbeam are in close contact, prevent the existence of welding gaps between the welding surface of the energy absorbing box and the welding surface of the crossbeam, and ensure the welding quality of the energy absorbing box and the crossbeam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 It is a three-dimensional structural diagram of a part of the structure of the present invention.

[0024] Figure 4 It is a three-dimensional structural schematic diagram of the return spring, locking plate and locking groove of the present invention.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the linkage group of the present invention.

[0026] Figure 6 It is a three-dimensional structural diagram of the connecting spring and the elastic limiting rod of the present invention.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the adjustment group of the present invention.

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the clamping group of the present invention.

[0029] Figure 9 It is a schematic diagram of the three-dimensional structure of the present invention when clamping the energy absorbing box and the crossbeam.

[0030] Figure 10 It is a schematic diagram of the three-dimensional structure of the beam assembly.

[0031] Reference numerals: 1. welding base; 11. guide groove; 12. locking group; 121. elastic support rod; 122. locking plate; 123. locking groove; 13. lifting plate; 14. return spring; 2. welding robot; 3. clamping unit; 31. U-shaped seat; 32. elastic pressing rod; 33. clamping block; 34. square plate; 35. locking rod; 4. positioning unit; 41. active member; 42. sliding plate; 421. L-shaped plate; 422. pushing rod; 423. pushing plate; 43. pressure spring; 44. positioning plate; 45. coupling Driving group; 451, linkage plate; 452, square shell; 453, connecting spring; 454, lower pressure plate; 455, elastic limit rod; 5, calibration unit; 51, extension spring; 52, transmission block; 53, adjustment group; 531, fixed plate; 532, adjustment plate; 533, support guide rod; 534, adjustment screw; 535, sliding plate; 536, guide spring; 54, clamping group; 541, elastic extension rod; 542, clamping block; 543, matching plate; 544, round rod; 545, elastic lower pressure rod; 546, calibration plate. DETAILED DESCRIPTION

[0032] The embodiments described below are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in the art or the product instructions shall be followed.

[0033] See Figure 1 and Figure 10 An automatic welding system for an automobile bumper beam assembly includes a welding base 1, a welding robot 2 is installed on the welding base 1, two left-right symmetrical clamping units 3 are installed on the upper side of the welding base 1, the clamping units 3 are used to clamp the beam, and two left-right symmetrically arranged positioning units 4 are also installed on the upper side of the welding base 1, and a calibration unit 5 is installed on the positioning unit 4.

[0034] It should be noted that the welding base 1 includes a supporting base, and two symmetrically arranged mounting seats are fixedly installed on the front side of the upper end of the supporting base. The clamping unit 3 and the positioning unit 4 are both installed on the corresponding mounting seats, and the welding robot 2 is installed in the middle of the rear side of the upper end surface of the supporting base.

[0035] The present invention is used for welding crossbeam assemblies. When welding crossbeam assemblies of different specifications, the present invention can accurately align the energy absorption box and the preset welding area of ​​the crossbeam, thereby ensuring the quality of the welded crossbeam assembly. At the same time, the present invention can also tightly fit the welding surface of the energy absorption box and the welding surface of the crossbeam together to prevent the presence of a welding gap between the energy absorption box and the crossbeam, thereby ensuring the welding quality of the crossbeam assembly.

[0036] Specifically, first, the beam is pre-clamped by the two clamping units 3, and the two energy absorption boxes are pre-clamped respectively by the positioning unit 5, and the energy absorption boxes are arranged vertically, and then the positioning unit 4 is controlled to position the left and right ends of the beam, and the position of the clamped energy absorption box is adjusted according to the end position of the beam by controlling the positioning unit 5, so that the energy absorption boxes adapted to the beam assemblies of different specifications and the preset welding areas of the beam are accurately aligned, and the positioning unit 4 can also elastically squeeze the left and right ends of the beam, so that the beam and the welding base 1 are aligned in the center left and right, and at the same time, the positioning unit 4 drives the energy absorption box clamped by the positioning unit 5 to move downward and press against the upper side of the beam, so that the beam is in the energy absorption box. Under the action of pressing, the beam can be arranged symmetrically on the left and right with the middle of the welding base 1 as the reference, that is, the two preset welding areas of the beam are arranged symmetrically on the left and right with the middle of the welding base 1 as the reference, and the energy absorption box is arranged vertically, so that the welding surface of the energy absorption box and the welding surface of the beam are tightly pressed together, and then the two clamping units 3 clamp and fix the beam, and the positioning unit 5 clamps and fixes the corresponding energy absorption box. Finally, the welding robot 2 is controlled to weld the beam and the energy absorption box together, the positioning unit 4 is controlled to return to the initial position, and the clamping unit 3 is controlled to release the beam, and the positioning unit 5 is controlled to release the energy absorption box, so that the beam assembly after welding is removed, and the welding of the beam assembly is completed.

[0037] See Figure 1 、 Figure 3 and Figure 4 The clamping unit 3 includes a U-shaped seat 31 fixedly mounted on the upper side of the mounting base. Clamping blocks 33 are slidably mounted on the front and rear inner walls of the U-shaped seat 31 via multiple elastic abutment rods 32 evenly spaced horizontally. The upper ends of the opposing sides of the two clamping blocks 33 are each provided with an inclined surface. The multiple elastic abutment rods 32 corresponding to the same clamping block 33 slide back and forth through the U-shaped seat 31 and are jointly fixedly mounted with a square plate 34. The lower end of the square plate 34 is fixedly mounted with multiple locking rods 35 evenly spaced horizontally. A locking group 12 is mounted on the upper end of the mounting base at positions corresponding to the square plates 34. The elastic abutment rods 32 consist of a circular shaft mounted between the square plate 34 and the corresponding clamping block 33, and a spring connected between the square plate 34 and the outer wall of the vertical section of the U-shaped seat 31.

[0038] The clamping unit 3 is used to clamp and fix the beam; specifically, first, the end of the beam is placed between the two clamping blocks 33 from the upper side of the two clamping blocks 33 corresponding to the U-shaped seat 31 and contacts the inner bottom wall of the U-shaped seat 31. During this process, when the end of the beam contacts the inclined surface of the clamping block 33 and continues to move downward, the two clamping blocks 33 drive the corresponding circular axes to move away from each other and stretch the spring of the elastic clamping rod 32. Under the action of the rebound force of the elastic clamping rod 32, the flat parts on the opposite sides of the two clamping blocks 33 elastically pre-clamp the beam.

[0039] When the circular axis of the elastic clamping rod 32 moves, it drives the square plate 34 to move away from the U-shaped seat 31. When the control positioning unit 4 drives the calibration unit 5 to make the welding surface of the energy absorption box and the welding surface of the beam tightly pressed together, the positioning unit 4 can also drive the locking group 12 and the locking rod 35 to cooperate to lock the position of the square plate 34, so that the two clamping blocks 33 rigidly clamp and fix the beam to ensure the stability of the welding between the beam and the energy absorption box. When the control positioning unit 4 returns to its initial position, the locking group 12 automatically releases the lock on the square plate 34, so that the beam assembly can be quickly removed manually after welding, ensuring the welding efficiency of the beam assembly.

[0040] See Figure 1 and Figure 3 A guide groove 11 is provided on the upper side of the mounting seat. The positioning unit 4 includes a sliding plate 42 that is connected to the guide groove 11 for left and right sliding through an active member 41. Positioning plates 44 are installed on opposite sides of the two sliding plates 42 through multiple pressure springs 43 evenly arranged up and down. The positioning plates 44 are also installed in the guide groove 11 for left and right sliding; the U-shaped seat 31 is located on the opposite sides of the two positioning plates 44.

[0041] It should be noted that the active member 41 is a multi-stage electric push rod, the pushing end of which is connected to the back side of the sliding plate 42 , and the sliding plate 42 is driven to slide left and right in the guide groove 11 by starting the multi-stage electric push rod.

[0042] The positioning unit 4 is used to position the left and right ends of the beam; specifically, the two active parts 41 are started at the same time to drive the two sliding plates 42 to move synchronously along the guide groove 11 in the direction of approaching each other, and the sliding plate 42 drives the positioning plate 44 to move synchronously along the guide groove 11 through the pressure spring 43. When the positioning plate 44 hits the end of the beam and the sliding plate 42 continues to move, the pressure spring 43 is compressed and contracted, and the two positioning plates 44 elastically squeeze the beam in the direction of approaching each other under the action of the corresponding pressure spring 43. The elastic pre-clamping of the beam in the left and right directions is realized, and at this time, the clamping block 33 performs front-to-back pre-clamping on the beam.

[0043] When the welding of the beam and the energy absorption box is completed, the two active parts 41 are controlled to drive the two sliding plates 42 to move synchronously along the guide groove 11 in the direction away from each other to the initial position, and the sliding plates 42 drive the two positioning plates 44 to move synchronously through the pressure spring 43, so that the positioning plates 44 no longer squeeze the end of the beam.

[0044] See Figure 1 、 Figure 3 and Figure 4 The locking group 12 includes a locking plate 122 installed on the upper side of the mounting seat through multiple elastic support rods 121. The locking plate 122 is provided with multiple locking grooves 123 evenly arranged front and back at the positions corresponding to the locking rods 35. The locking grooves 123 are used to cooperate with the corresponding locking rods 35 to lock the square plate 34.

[0045] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A lifting plate 13 is installed on the upper side of the mounting seat for sliding left and right, and is located on the opposite sides of the left and right locking plates 122. The upper end of the lifting plate 13 close to the middle of the welding base 1 is provided with an inclined surface that cooperates with the locking plate 122. A return spring 14 is connected between the lifting plate 13 and the mounting seat. L-shaped plates 421 for pushing the corresponding lifting plates 13 are fixedly installed at both ends of the sliding plate 42.

[0046] The locking group 12 is used to cooperate with the locking rod 35 to lock the position of the square plate 34; specifically, when the two sliding plates 42 move toward each other and the welding surface of the energy absorption box and the welding surface of the beam are tightly pressed together, the sliding plate 42 drives the L-shaped plate 421 to move toward the middle of the welding base 1 to the corresponding position of the lifting plate 13, and contacts the corresponding lifting plate 13, and the two sliding plates 42 continue to move toward each other, and the L-shaped plate 421 pushes the lifting plate 13 to move toward the middle of the welding base 1, and the inclined surface of the lifting plate 13 drives the corresponding locking plate 122 to move upward and stretch the elastic support rod 121, and the locking rod 35 is inserted into the locking groove 123 of the locking plate 122 corresponding to its position, thereby locking the position of the square plate 34, so that the two clamping blocks 33 rigidly clamp and fix the beam.

[0047] When the two sliding plates 42 move away from each other, the sliding plate 42 drives the L-shaped plate 421 to move away from the middle of the welding base 1, and gradually separates from its corresponding lifting plate 13. The lifting plate 13 moves away from the middle of the welding base 1 under the action of the rebound force of the reset spring 14, and the locking plate 122 moves downward to the initial position under the action of the rebound force of the elastic support rod 121, so that the locking rod 35 moves out of the locking groove 123 of the locking plate 122, thereby releasing the position lock of the square plate 34.

[0048] See Figure 1 、 Figure 3 and Figure 5 The positioning unit 5 includes a transmission block 52 which is installed on the opposite sides of the two positioning plates 44 by sliding up and down through a top spring 51. An adjustment group 53 is installed on the opposite sides of the two transmission blocks 52. A clamping group 54 for vertically clamping the energy absorbing box is installed on the adjustment group 53. The adjustment group 53 is used to adjust the position of the energy absorbing box clamped by the clamping group 54 according to the welding position on the beam; a linkage group 45 is connected between the transmission block 52, the positioning plate 44 and the sliding plate 42. When the positioning plate 44 is attached to the end of the beam and the sliding plate 42 continues to move, the linkage group 45 finally drives the energy absorbing box downward to press against the upper side of the beam through the transmission block 52.

[0049] The calibration unit 5 is used to vertically clamp the energy absorption box and calibrate the beam; specifically, first, the position of the clamping group 54 is adjusted according to the distance control adjustment group 53 between the preset welding area of ​​the beam and the corresponding end, and then the two energy absorption boxes are distributed in the two clamping groups 54. At this time, the distance between the energy absorption box and the corresponding positioning plate 44 is the same as the distance between the preset welding area of ​​the beam and the corresponding end. The clamping group 54 can vertically clamp the energy absorption box. When the two positioning plates 44 move toward each other to fit the end of the beam and stop moving, the positioning plate 44 finally drives the energy absorption box clamped by the clamping group 54 through the transmission block 52 to move to the position corresponding to the top of the preset welding area of ​​the beam and stop moving. Then, when welding beam assemblies of different specifications, the energy absorption box and the preset welding area of ​​the beam can be accurately aligned to ensure the quality of the welded beam assembly.

[0050] When the two positioning plates 44 are fitted to the left and right ends of the beam and the two sliding plates 42 continue to move toward each other, the linkage group 45 drives the transmission block 52 to move downward and compresses the top extension spring 51, so that the transmission block 52 drives the energy absorption box clamped by the clamping group 54 to move downward through the adjustment group 53 and press against the upper side of the beam. At this time, the two clamping blocks 33 pre-clamp the beam so that the lower side of the beam can press against the two U-shaped seats 31 under the downward pressing action of the energy absorption box. Moreover, since the beam is aligned with the left and right centers of the welding base 1 under the squeezing action of the two positioning plates 44, the contact position between the beam and the two U-shaped seats 31 is The welding base 1 is arranged symmetrically on the left and right with the middle part as the reference, so that the beam can be arranged symmetrically on the left and right with the middle part of the welding base 1 as the reference under the pressing action of the energy absorption box, that is, the two preset welding areas of the beam are arranged symmetrically on the left and right with the middle part of the welding base 1 as the reference, and the energy absorption box is arranged vertically and pressed against the upper side of the preset welding area of ​​the beam, so that the welding surface of the energy absorption box and the welding surface of the beam are in close contact, preventing the existence of a welding gap between the welding surface of the energy absorption box and the welding surface of the beam, ensuring the welding quality of the energy absorption box and the beam, and then the two clamping blocks 33 rigidly clamp and fix the beam, and control the welding robot 2 to weld the beam and the energy absorption box together.

[0051] When the welding of the beam and the energy absorption box is completed and the two positioning plates 44 are reset to their initial positions in the direction away from each other, the positioning plates 44 eventually drive the two clamping groups 54 to move away from each other to their initial positions through the transmission block 52, and the clamping groups 54 can automatically release the clamping fixation of the energy absorption box, thereby facilitating the rapid removal of the welded beam assembly and increasing the welding efficiency of the beam assembly.

[0052] See Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 and Figure 8The adjustment group 53 includes a fixed plate 531 fixedly installed on the opposite sides of the two transmission blocks 52, and a U-shaped adjustment plate 532 is distributed on the opposite sides of the two fixing plates 531. The rear ends of the two adjustment plates 532 on the opposite sides are fixedly installed with a support guide rod 533, and the support guide rod 533 and the fixed plate 531 are connected for sliding left and right. The front ends of the two adjustment plates 532 on the opposite sides are rotatably installed with an adjustment screw 534, and the adjustment screw 534 is threadedly connected to the corresponding fixed plate 531.

[0053] See Figure 3 、 Figure 5 、 Figure 7 and Figure 8 The clamping group 54 includes a clamping block 542 that is slidably installed on the front and rear inner walls of the adjustment plate 532 through multiple elastic push rods 541 evenly arranged on the left and right. The ends of the opposite sides of the two clamping blocks 542 close to the middle of the welding base 1 are both set as inclined surfaces. The multiple elastic push rods 541 corresponding to the same clamping block 542 slide back and forth through the adjustment plate 532 and are jointly fixed with a matching plate 543. A round rod 544 is fixedly installed on the side of the matching plate 543 away from the middle of the welding base 1.

[0054] See Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 8 and Figure 10 The clamping group 54 also includes a positioning plate 546 that is installed on the upper side of the adjustment plate 532 by sliding up and down through multiple elastic downward pressure rods 545. The lower end of the positioning plate 546 on one side close to the middle of the welding base 1 is set as a slope; wherein the lower side surface of the positioning plate 546 is in contact with the upper side surface of the clamping block 542.

[0055] The adjustment group 53 is used to adjust the position of the clamped energy absorbing box, and the clamping group 54 is used to vertically clamp the energy absorbing box; first, according to the distance between the preset welding area and the corresponding end of the beam, the adjusting screw 534 is screwed, and under the guidance of the support guide rod 533, the adjusting screw 534 drives the adjustment plate 532 to move a distance in the direction close to the welding base 1, so that the distance between the inner wall of the horizontal longitudinal section of the adjustment plate 532 and the positioning plate 44 is the same as the distance between the preset welding area and the corresponding end of the beam, and the adjustment plate 532 drives the corresponding two clamping blocks 542 to move through the elastic top rod 541, and then the energy absorbing box is placed into the adjustment plate 532 from between the inclined surfaces of the two clamping blocks 542 with the welding surface facing down, and the energy absorbing box is in contact with the inner wall of the horizontal longitudinal section of the adjustment plate 532.

[0056] During the process of placing the energy absorbing box into the adjustment plate 532, the energy absorbing box is pushed by the inclined surface of the clamping block 542 to move the clamping block 542 away from the middle of the adjustment plate 532 and compress the elastic extension rod 541. After the energy absorbing box is placed in, under the action of the rebound force of the elastic extension rod 541, the opposite side planes of the two clamping blocks 542 corresponding to the adjustment plate 532 can continue to pre-clamp the energy absorbing box; and during the process of placing the energy absorbing box into the adjustment plate 532, the connecting bracket on the energy absorbing box and the inclined surface of the alignment plate 546 cooperate to drive the alignment plate 546 Move upward and stretch the elastic downward pressure rod 545. After the energy absorption box is placed in, the positioning plate 546 is pressed against the upper side of the connecting bracket on the energy absorption box under the action of the rebound force of the elastic downward pressure rod 545, thereby making the energy absorption box vertically arranged. When the two positioning plates 44 move toward each other to the end of the beam and stop moving, the two clamping blocks 542 drive the energy absorption box to move above the preset welding area of ​​the beam. The two clamping blocks 542 are clamped at the upper end of the energy absorption box, thereby not affecting the welding operation of the welding machine robot on the energy absorption box and the beam.

[0057] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 and Figure 9 , sliding plates 535 are installed on the front and rear sides of the adjusting plate 532 and at one end away from the middle of the welding base 1 for sliding left and right sliding, and a guide spring 536 is connected between the sliding plate 535 and the adjusting plate 532, and a plurality of circular holes evenly arranged front and back are opened on the sliding plate 535, and the circular holes are used to cooperate with the corresponding round rods 544 to lock the matching plate 543, and the positions of the sliding plates 535 on the front and rear sides of the sliding plate 42 corresponding to the front and rear sides are fixedly installed with L-shaped pushing rods 422, and the horizontal transverse section of the pushing rod 422 is set to an elastic telescopic structure, and a pushing plate 423 is fixedly installed on the end of the pushing rod 422 close to the middle of the welding base 1; wherein, the elastic force of the elastic telescopic structure of the pushing rod 422 is much greater than the elastic force of the guide spring 536.

[0058] When the adjusting plate 532 is in the extreme position close to the fixed plate 531, the pushing plate 423 and the sliding plate 535 are in contact. When the position adjustment of the adjusting plate 532 is completed, there is a certain distance between the pushing plate 423 and the sliding plate 535. When the two positioning plates 44 move toward each other to the end of the beam and stop moving, and the sliding plate 42 continues to move, the sliding plate 42 drives the pushing plate 423 to move toward the middle of the welding base 1 through the pushing rod 422. When the pushing plate 423 and the sliding plate 535 are in contact and continue to move, the pushing plate 423 pushes the sliding plate 535 toward the welding base 1. The guide spring 536 is compressed in the direction of the middle of the connecting base 1, so that the round rod 544 is inserted into the circular hole of the sliding plate 535 corresponding to its position, thereby locking the position of the matching plate 543, so that the clamping block 542 clamps the fixed energy absorption box to ensure stability during welding. At the same time, the linkage group 45 finally drives the clamping block 542 to clamp the fixed energy absorption box downward through the transmission block 52 and press it against the crossbeam. During this process, the pushing plate 423 is always in contact with the sliding plate 535. When the sliding plate 535 moves to the extreme position toward the middle of the welding base 1, the telescopic structure of the pushing rod 422 can be compressed.

[0059] When the welding of the beam assembly is completed and the two positioning plates 44 are reset, the sliding plate 42 drives the pushing plate 423 to move away from the middle of the welding base 1 through the pushing rod 422 and gradually separates from the sliding plate 535. The sliding plate 535 moves away from the middle of the welding base 1 under the action of the rebound force of the guide spring 536, so that the round rod 544 moves out of the round hole at the corresponding position, thereby releasing the position lock of the matching plate 543, so that the clamping block 542 elastically pre-clamps the energy absorption box after welding is completed. When the two positioning plates 44 finally drive the corresponding two clamping blocks 542 to move to the initial position away from the middle of the welding base 1 through the transmission block 52, the energy absorption box automatically moves out between the clamping blocks 542, thereby facilitating the rapid removal of the welded beam assembly, thereby improving the welding efficiency of the beam assembly.

[0060] See Figure 1 、 Figure 5 and Figure 6 The linkage group 45 includes a linkage plate 451 fixedly mounted on the upper end of the transmission block 52, and the upper end of the linkage plate 451 slides up and down through the positioning plate 44, and the upper ends of the opposite sides of the two sliding plates 42 are fixedly mounted with square shells 452, and the opposite sides of the two square shells 452 are slidably mounted with lower pressure plates 454 on the left and right sides through connecting springs 453, and the lower ends of the opposite sides of the two lower pressure plates 454 are set to inclined surfaces that match the linkage plate 451, and the inclined surfaces of the lower pressure plates 454 are in contact with the upper ends of the linkage plates 451; wherein, the upper end of the side where the inclined surface of the linkage plate 451 is located is set to an arc structure, and the elastic force of the connecting spring 453 is much greater than the elastic force of the extension spring 51.

[0061] See Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 10 The front and rear inner walls of the square shell 452 are both slidably installed with elastic limiting rods 455 on one side close to the middle of the welding base 1, and the elastic limiting rods 455 are in contact with the lower pressure plate 454. The lower pressure plate 454 has limiting grooves on both sides of the front and rear and on one side close to the middle of the welding base 1. The limiting grooves are used to cooperate with the elastic limiting rods 455 to limit the position of the lower pressure plate 454. The opposite sides of the two elastic limiting rods 455 and the ends away from the middle of the welding base 1 are both set as inclined surfaces.

[0062] The linkage group 45 is used to drive the energy absorption box downward to press against the upper side of the beam; specifically, when the two positioning plates 44 move toward each other to the end of the beam and stop moving, and the sliding plate 42 continues to move, the sliding plate 42 eventually drives the two lower pressure plates 454 to move toward each other through the square shell 452, and the inclined surface of the lower pressure plate 454 and the linkage plate 451 cooperate to move the transmission block 52 downward, and the transmission block 52 eventually drives the two clamping blocks 542 to clamp and fix the energy absorption box downward. When the energy absorption box moves to contact the beam and the lower pressure plate 454 continues to move, the lower pressure plate 454 compresses the connecting spring 453 under the blocking action of the linkage plate 451 that can no longer move downward.

[0063] When the lower pressure plate 454 moves relative to the square shell 452 in the direction close to the corresponding sliding plate 42 under the blocking action of the linkage plate 451, and the limit groove on the lower pressure plate 454 moves toward the corresponding elastic limit rod 455, the two clamping blocks 33 begin to clamp and fix the cross beam, and when the limit groove on the lower pressure plate 454 moves to correspond to the elastic limit rod 455, the elastic limit rod 455 can automatically insert into the limit groove under the action of its own rebound force. At this time, the lower pressure plate 454 cannot continue to move in the direction close to the sliding plate 42, and then the positioning plate 44 cannot move relative to the sliding plate 42 in the direction close to the sliding plate 42, and because the arc-shaped cross beam is placed and fixed with the concave surface facing upward, the energy absorption box close to the concave surface of the cross beam is restricted by the concave surface of the cross beam and cannot move in the direction away from the middle of the welding base 1. Then, the energy absorption box cannot move left and right, ensuring the relative stability of the energy absorption box and the cross beam during welding.

[0064] When the two sliding plates 42 begin to move away from each other, the lower pressing plate 454 will move relative to the square shell 452 in the direction away from the corresponding sliding plate 42 under the action of the rebound force of the connecting spring 453, and the inclined surface of the elastic limiting rod 455 enables the elastic limiting rod 455 to move out of the limiting groove on the lower pressing plate 454. When the elastic limiting rod 455 is misaligned with the limiting groove, the elastic limiting rod 455 contacts the lower pressing plate 454 and elastically contracts and deforms, and the lower pressing plate 454 finally moves to the initial position. When the two positioning plates 44 begin to move away from each other and separate from the end of the beam, the positioning plate 44 finally drives the corresponding two clamping blocks 542 to move through the transmission block 52. At this time, the pushing plate 423 and the sliding plate 535 are completely separated, the round rod 544 moves out of the corresponding round hole, the position lock of the matching plate 543 is released, and the two clamping blocks 542 elastically pre-clamp the energy absorption box. At the same time, because the positioning plate 546 is pressed against the upper side of the connecting bracket on the energy absorption box, and the lower side of the connecting bracket on the energy absorption box contacts the upper side of the clamping block 542, the clamping block 542 is blocked from moving up. Therefore, before the two clamping blocks 542 and the connecting bracket are completely separated, the transmission block 52 will not return to its initial position under the action of the extension spring 51. When the two clamping blocks 542 and the connecting bracket are completely separated, the transmission block 52 returns to its initial position under the action of the rebound force of the extension spring 51.

[0065] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An automatic welding system for automobile bumper beam assemblies, comprising a welding base, a welding robot mounted on the welding base, and two left-right symmetrical clamping units mounted on the upper side of the welding base for clamping the beam, characterized in that: Two symmetrically arranged positioning units are also installed on the upper side of the welding base, and a calibration unit is installed on the positioning unit; The upper side of the welding base is provided with a guide groove corresponding to the positioning unit one by one. The positioning unit includes a sliding plate connected to the guide groove by an active member and slidingly connected to the guide groove left and right. The opposite sides of the two sliding plates are each equipped with a positioning plate through a plurality of pressure springs evenly arranged up and down. The positioning plate is also slidably installed in the guide groove left and right. The calibration unit includes a transmission block that is slidably mounted on opposite sides of the two positioning plates via a top extension spring. An adjustment group is mounted on opposite sides of the two transmission blocks. A clamping group for vertically clamping the energy absorption box is mounted on the adjustment group. The adjustment group is used to adjust the position of the energy absorption box clamped by the clamping group according to the welding position on the beam. A linkage group is connected between the transmission block, the positioning plate and the sliding plate. When the positioning plate is attached to the end of the beam and the sliding plate continues to move, the linkage group finally drives the energy absorption box downward to press against the upper side of the beam through the transmission block. The adjustment group includes a fixed plate fixedly mounted on opposite sides of the two transmission blocks, and a U-shaped adjustment plate is distributed on the opposite sides of the two fixed plates. The rear ends of the two adjustment plates are fixedly mounted with a support guide rod, and the support guide rod and the fixed plate are slidably connected left and right. The front ends of the two adjustment plates are rotatably mounted with an adjustment screw, and the adjustment screw is threadedly connected to the corresponding fixed plate. The linkage group includes a linkage plate fixedly installed on the upper end of the transmission block, and the upper end of the linkage plate slides up and down and passes through the positioning plate. Square shells are fixedly installed on the upper ends of the opposite sides of the two sliding plates. Lower pressure plates are installed on the opposite sides of the two square shells for sliding left and right through connecting springs. The lower ends of the opposite sides of the two lower pressure plates are set to inclined surfaces that match the linkage plate, and the inclined surfaces of the lower pressure plates are in contact with the upper ends of the linkage plates.

2. The automatic welding system for automobile bumper beam assembly according to claim 1, characterized in that: The clamping unit includes two U-shaped seats fixedly mounted on the upper side of the welding base and arranged on opposite sides thereof, and the U-shaped seat is located on opposite sides of the two positioning plates. The front and rear inner walls of the U-shaped seat are both slidably mounted with clamping blocks through a plurality of elastic clamping rods evenly arranged on the left and right. The upper ends of the opposite sides of the two clamping blocks are both set to inclined surfaces, and a plurality of elastic clamping rods corresponding to the same clamping block slide back and forth through the U-shaped seat and are jointly fixedly mounted with a square plate, and a plurality of locking rods evenly arranged on the left and right are fixedly mounted on the lower end of the square plate.

3. The automatic welding system for automobile bumper beam assembly according to claim 2, characterized in that: A locking group is installed at the position corresponding to the square plate on the upper end of the welding base. The locking group includes a locking plate installed on the upper side of the welding base through a plurality of elastic support rods. The locking plate is provided with a plurality of locking grooves evenly arranged front and back at the position corresponding to the locking rod. The locking groove is used to cooperate with the corresponding locking rod to lock the square plate.

4. The automatic welding system for automobile bumper beam assembly according to claim 3, characterized in that: A lifting plate is installed on the upper side of the welding base for sliding left and right, and is located on the opposite sides of the left and right locking plates. The upper end of the lifting plate close to the middle of the welding base is provided with an inclined surface that cooperates with the locking plate. A return spring is connected between the lifting plate and the welding base, and L-shaped plates for pushing the corresponding lifting plates are fixedly installed at both ends of the sliding plate.

5. The automatic welding system for automobile bumper beam assembly according to claim 1, characterized in that: The clamping group includes clamping blocks that are installed to slide back and forth on the front and rear inner walls of the adjustment plate through multiple elastic push rods evenly arranged on the left and right. The ends of the opposite sides of the two clamping blocks close to the middle of the welding base are set as inclined surfaces. Multiple elastic push rods corresponding to the same clamping block slide back and forth through the adjustment plate and are jointly fixed with a matching plate. A round rod is fixedly installed on the side of the matching plate away from the middle of the welding base.

6. The automatic welding system for automobile bumper beam assembly according to claim 5, characterized in that: The adjusting plate is provided with sliding plates that can be slidably mounted on both sides of the front and rear and on one end away from the middle of the welding base. A guide spring is connected between the sliding plate and the adjusting plate. The sliding plate is provided with a plurality of circular holes that are evenly arranged front and back. The circular holes are used to cooperate with corresponding round rods to lock the matching plate. L-shaped pushing rods are fixedly mounted on the positions of the sliding plates corresponding to the front and rear sides of the sliding plate, and the horizontal transverse section of the pushing rod is set to an elastic telescopic structure. The pushing plate is fixedly mounted on one end of the pushing rod close to the middle of the welding base.

7. The automatic welding system for automobile bumper beam assembly according to claim 1, characterized in that: The clamping group also includes a calibration plate that is mounted on the upper side of the adjustment plate by sliding up and down through a plurality of elastic pressing rods, and the lower end of one side of the calibration plate close to the middle of the welding base is set as an inclined surface.

8. The automatic welding system for automobile bumper beam assembly according to claim 1, characterized in that: Elastic limit rods are installed on the front and rear inner walls of the square shell on one side close to the middle of the welding base for sliding back and forth, and the elastic limit rods are arranged in contact with the lower pressure plate. Limit grooves are provided on the front and rear sides of the lower pressure plate and on one side close to the middle of the welding base. The limit grooves are used to cooperate with the elastic limit rods to limit the position of the lower pressure plate. The opposite sides of the two elastic limit rods and the ends away from the middle of the welding base are both set as inclined surfaces.

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