Automatic welding system for automobile bumper beam assembly

Abstract

The invention relates to the technical field of bumper machining, in particular to an automatic welding system for an automobile bumper beam assembly, which comprises a welding base, a welding robot is mounted on the welding base, two clamping units which are bilaterally symmetrical are mounted on the upper side of the welding base, and the clamping units are used for clamping a beam. Two positioning units which are symmetrically arranged left and right are further installed on the upper side of the welding base, and position correcting units are installed on the positioning units. The end portion of the cross beam is positioned through the positioning unit, meanwhile, the adjusting set is arranged to adjust the position of the energy absorption box according to the distance between the preset welding area of the cross beam and the corresponding end portion, and therefore when cross beam assemblies of different specifications are welded, accurate alignment of the energy absorption box and the preset welding area of the cross beam can be guaranteed, and welding efficiency is improved. And the quality of the welded cross beam assembly is ensured.

Description

Technical Field

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

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

[0003] Currently, when welding the crossbeam assembly, usually the energy absorption box is manually placed in the preset welding area of the crossbeam, then the energy absorption box and the crossbeam are mechanically locked by a clamping die, then the energy absorption box and the crossbeam are welded together by a welding robot, and finally the clamping die is controlled to release the energy absorption box and the crossbeam, and the welded crossbeam assembly is taken out to complete the welding of the crossbeam assembly.

[0004] However, the following problems exist in the above crossbeam assembly welding process: 1. Incorrect welding positioning of the energy absorption box: The traditional clamping die is a rigid integral design and only adapts to a single specification of energy absorption box. When welding crossbeam assemblies of different specifications, the clamping die needs to be replaced and its position adjusted. And when manually adjusting the welding position of the energy absorption box adapted to crossbeam assemblies of different specifications on the crossbeam, positioning deviation may occur, thus affecting the quality of the welded crossbeam assembly.

[0005] 2. Welding gaps exist: Since the crossbeam is often an arc-shaped structure, the welding surface between the crossbeam and the energy absorption box is usually an arc-shaped surface. When welding the crossbeam and the energy absorption box, the energy absorption box and the crossbeam may not fit tightly, resulting in welding gaps, thus reducing the welding quality. Summary of the Invention

[0006] To solve the above technical problems, the present invention adopts the following technical solutions. An automatic welding system for an automobile bumper crossbeam assembly includes a welding base, a welding robot is installed on the welding base, two symmetrically arranged clamping units are installed on the upper side of the welding base, the clamping units are used for clamping the crossbeam, and two symmetrically arranged positioning units are also installed on the upper side of the welding base, and a position alignment unit is installed on the positioning units.

[0007] Guide grooves corresponding to the positioning units one by one are provided on the upper side of the welding base. The positioning unit includes a sliding plate that is slidably connected to the guide groove left and right through a driving member. On the opposite sides of the two sliding plates, positioning plates are installed through a plurality of uniformly arranged compression springs up and down, and the positioning plates are also slidably installed left and right in the guide groove.

[0008] The alignment unit includes a transmission block slidably mounted up and down by a top extension spring on the opposite sides of two positioning plates. Adjusting groups are installed on the opposite sides of the two transmission blocks, and a clamping group for vertically clamping the energy absorption box is installed on the adjusting group. The adjusting group is used to adjust the position of the energy absorption box clamped by the clamping group according to the welding position on the cross 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 cross beam and the sliding plate continues to move, the linkage group finally drives the energy absorption box to press down against the upper side of the cross beam through the transmission block.

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

[0010] Preferably, locking groups are installed at the positions corresponding to the square plates 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. A plurality of locking grooves arranged evenly front and back are opened at the positions corresponding to the locking rods on the locking plate, and the locking grooves are used to cooperate with the corresponding locking rods to lock the square plate.

[0011] Preferably, a lifting plate is slidably installed left and right on the upper side of the welding base and is located on the opposite sides of the left and right locking plates. An inclined surface matching the locking plate is opened at the upper end of the side of the lifting plate close to the middle of the welding base. A return spring is connected between the lifting plate and the welding base. L-shaped plates for pushing the corresponding lifting plates are fixedly installed at both the front and rear ends of the sliding plate.

[0012] Preferably, the adjusting group includes fixing plates fixedly installed on the opposite sides of the two transmission blocks. U-shaped adjusting plates are distributed on the opposite sides of the two fixing plates. Support guide rods are fixedly installed at the rear ends of the opposite sides of the two adjusting plates, and the support guide rods are slidably connected to the fixing plates left and right. Adjusting screws are rotatably installed at the front ends of the opposite sides of the two adjusting plates, and the adjusting screws are threadedly connected to the corresponding fixing plates.

[0013] Preferably, the clamping group includes clamping blocks slidably installed back and forth on the front and rear inner walls of the adjusting plate through a plurality of elastic top extension rods arranged evenly 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 as inclined surfaces. A plurality of elastic top extension rods corresponding to the same clamping block slide back and forth through the adjusting plate and are jointly fixedly installed 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.

[0014] Preferably, sliding plates are installed on both the front and rear sides of the adjusting plate and at one end far from the middle of the welding base in a left-right sliding manner. A guiding spring is connected between the sliding plate and the adjusting plate. A plurality of round holes are evenly arranged in the front-rear direction on the sliding plate. The round holes are used to cooperate with the corresponding round rods to lock the fitting plate. On both the front and rear sides of the sliding plate, at positions corresponding to the sliding plate, L-shaped pushing rods are fixedly installed. The horizontal transverse section of the pushing rod is arranged as an elastic telescopic structure. A pushing plate is fixedly installed at one end of the pushing rod close to the middle of the welding base.

[0015] Preferably, the clamping group further includes an alignment plate that is slidably installed on the upper side of the adjusting plate through a plurality of elastic pressing rods. The lower end of the side of the alignment plate close to the middle of the welding base is provided as an inclined surface.

[0016] Preferably, the linkage group includes a linkage plate fixedly installed at the upper end of the transmission block. The upper end of the linkage plate slidably penetrates through the positioning plate vertically. Square shells are fixedly installed at the upper ends of the opposite sides of the two sliding plates. On the opposite sides of the two square shells, lower pressing plates are installed in a left-right sliding manner through connecting springs. The lower ends of the opposite sides of the two lower pressing plates are provided as inclined surfaces that cooperate with the linkage plate, and the inclined surface of the lower pressing plate is in contact with the upper end of the linkage plate.

[0017] Preferably, elastic limiting rods are slidably installed in the front-rear direction on both the front and rear inner walls of the square shell on the side close to the middle of the welding base. The elastic limiting rods are in contact with the lower pressing plate. Limiting grooves are opened on both the front and rear sides of the lower pressing plate and on the side close to the middle of the welding base. The limiting grooves are used to cooperate with the elastic limiting rods to limit the position of the lower pressing plate. The ends of the opposite sides of the two elastic limiting rods and far from the middle of the welding base are provided as inclined surfaces.

[0018] The beneficial effects of the present invention are as follows: 1. The present invention positions the end of the crossbeam through the positioning unit and can adapt to crossbeam assemblies of different specifications. At the same time, by setting the adjustment group, the position of the energy absorption box is adjusted according to the distance between the preset welding area of the crossbeam and the corresponding end. Therefore, when welding crossbeam assemblies of different specifications, it can ensure the precise alignment of the energy absorption box and the preset welding area of the crossbeam, ensuring the quality of the welded crossbeam assembly.

[0019] 2. The present invention vertically clamps the energy absorption box by setting the clamping group. At the same time, by setting the linkage group, the energy absorption box is pressed downward against the crossbeam, and the two preset welding areas of the crossbeam are arranged symmetrically left and right with the middle of the welding base as the reference, ensuring that the welding surfaces of the energy absorption box and the crossbeam are in close contact, preventing welding gaps between the welding surfaces of the energy absorption box and the crossbeam, and ensuring the welding quality of the energy absorption box and the crossbeam. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 2 is Figure 1 The enlarged view at position A in

[0023] Figure 3 It is a schematic perspective view of a partial structure of the present invention.

[0024] Figure 4 It is a schematic perspective view of the return spring, locking plate and locking groove of the present invention.

[0025] Figure 5 It is a schematic perspective view of the linkage group of the present invention.

[0026] Figure 6 It is a schematic perspective view of the connecting spring and elastic limiting rod of the present invention.

[0027] Figure 7 It is a schematic perspective view of the adjustment group of the present invention.

[0028] Figure 8 It is a schematic perspective view of the clamping group of the present invention.

[0029] Figure 9 It is a schematic perspective view when the present invention clamps the energy absorption box and the cross beam.

[0030] Figure 10 It is a schematic perspective view of the cross beam assembly.

[0031] Reference numerals: 1, welding base; 11, guiding 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, driving member; 42, sliding plate; 421, L-shaped plate; 422, pushing rod; 423, pushing plate; 43, pressing spring; 44, positioning plate; 45, linkage group; 451, linkage plate; 452, square shell; 453, connecting spring; 454, lower pressing plate; 455, elastic limiting rod; 5, alignment unit; 51, extending spring; 52, transmission block; 53, adjustment group; 531, fixing plate; 532, adjusting plate; 533, supporting guide rod; 534, adjusting screw; 535, sliding plate; 536, guiding spring; 54, clamping group; 541, elastic extending rod; 542, clamping block; 543, mating plate; 544, round rod; 545, elastic pressing rod; 546, alignment plate. Detailed implementation manners

[0032] The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. For those without specific technologies or conditions noted in the embodiments, they shall be carried out according to the technologies or conditions described in the literature in the field or according to the product specifications.

[0033] Referring to Figure 1 and Figure 10 , an automatic welding system for an automotive bumper beam assembly, comprising a welding base 1, a welding robot 2 is installed on the welding base 1, two symmetrically arranged clamping units 3 are installed on the upper side of the welding base 1, the clamping units 3 are used for clamping the beam, and two symmetrically arranged positioning units 4 are also installed on the upper side of the welding base 1, and a positioning unit 5 is installed on the positioning unit 4.

[0034] It should be noted that the welding base 1 includes a support base, two symmetrically arranged mounting seats are fixedly installed on the front side of the upper end of the support base, the clamping units 3 and the positioning units 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 support base.

[0035] The present invention is used for welding the beam assembly. When welding beam assemblies of different specifications, the present invention can accurately align the preset welding areas of the energy-absorbing box and the beam, thereby ensuring the quality of the welded beam assembly. At the same time, the present invention can also tightly attach the welding surface of the energy-absorbing box and the welding surface of the beam together, preventing welding gaps between the energy-absorbing box and the beam, and thus ensuring the welding quality of the beam assembly.

[0036] Specifically, first, the beam is pre-clamped by two clamping units 3, and the two energy-absorbing boxes are respectively pre-clamped by the positioning unit 5, and the energy-absorbing boxes are vertically arranged. Then, the positioning unit 4 is controlled to position the left and right ends of the beam, and the positioning unit 5 is controlled to adjust the position of the clamped energy-absorbing box according to the end position of the beam, so that the preset welding areas of the energy-absorbing box and the beam adapted to beam assemblies of different specifications are accurately aligned. At the same time, 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 centered and aligned left and right. At the same time, the positioning unit 4 drives the energy-absorbing box clamped by the positioning unit 5 to move downward and abut against the upper side of the beam, so that the beam can be symmetrically arranged left and right with the middle of the welding base 1 as the reference under the abutting action of the energy-absorbing box, that is, the two preset welding areas of the beam are symmetrically arranged left and right with the middle of the welding base 1 as the reference, and the energy-absorbing boxes are vertically arranged, so that the welding surface of the energy-absorbing box and the welding surface of the beam are tightly abutted together. Then, the two clamping units 3 clamp and fix the beam, the positioning unit 5 clamps and fixes the corresponding energy-absorbing box. Finally, the welding robot 2 is controlled to weld the beam and the energy-absorbing box together, the positioning unit 4 is controlled to return to the initial position, the clamping unit 3 is controlled to release the beam, and the positioning unit 5 is controlled to release the energy-absorbing box, so as to take down the welded beam assembly and complete the welding of the beam assembly.

[0037] Refer to Figure 1 、 Figure 3 and Figure 4 , the clamping unit 3 includes a U-shaped seat 31 fixedly installed on the upper side of the mounting seat. Both the front and rear inner walls of the U-shaped seat 31 are slidably installed with clamping blocks 33 through a plurality of elastic abutting rods 32 arranged evenly left and right in the front and rear directions. The upper ends of the opposite sides of the two clamping blocks 33 are both set as inclined surfaces. A plurality of elastic abutting rods 32 corresponding to the same clamping block 33 slidably penetrate through the U-shaped seat 31 in the front and rear directions and are jointly fixedly installed with a square plate 34. A plurality of locking rods 35 arranged evenly left and right are fixedly installed at the lower end of the square plate 34; locking groups 12 are installed at the positions corresponding to the square plate 34 on the upper end of the mounting seat. The elastic abutting rod 32 is composed of a round shaft installed 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 for clamping and fixing the cross beam; specifically, first, the end of the cross beam is placed between the two clamping blocks 33 from the upper sides of the two corresponding clamping blocks 33 of 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 cross beam contacts the inclined surface of the clamping block 33 and continues to move downward, the two clamping blocks 33 drive the corresponding round shafts to move away from each other and stretch the spring of the elastic abutting rod 32. Under the resilience of the elastic abutting rod 32, the flat parts on the opposite sides of the two clamping blocks 33 elastically pre-clamp the cross beam.

[0039] While the round shaft of the elastic abutting 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 alignment unit 5 to tightly abut the welding surface of the energy absorption box and the welding surface of the cross beam together, at this time, 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 cross beam, ensuring the stability during the welding of the cross beam and the energy absorption box. When the control positioning unit 4 returns to the initial position, the locking group 12 automatically releases the locking of the square plate 34, so that the welded cross beam assembly can be quickly removed manually, ensuring the welding efficiency of the cross beam assembly.

[0040] Refer to Figure 1 and Figure 3 , a guiding groove 11 is opened on the upper side of the mounting seat. The positioning unit 4 includes a sliding plate 42 slidably connected to the guiding groove 11 left and right through a driving member 41. On the opposite sides of the two sliding plates 42, positioning plates 44 are installed through a plurality of pressing springs 43 arranged evenly up and down. The positioning plates 44 are also slidably installed in the guiding groove 11; the U-shaped seat 31 is located on the opposite sides of the two positioning plates 44.

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

[0042] The positioning unit 4 is used to position the left and right ends of the cross beam. Specifically, when two driving members 41 are started simultaneously, the two sliding plates 42 are driven to move synchronously in the guiding groove 11 in the direction approaching each other. The sliding plate 42 drives the positioning plate 44 to move synchronously in the guiding groove 11 through the compression spring 43. When the positioning plate 44 abuts against the end of the cross beam and the sliding plate 42 continues to move, the compression spring 43 is compressed and contracted. The two positioning plates 44 elastically squeeze the cross beam in the direction approaching each other under the resilience of the corresponding compression springs 43, realizing the elastic pre-clamping of the cross beam in the left and right directions. At this time, the clamping block 33 pre-clamps the cross beam in the front and back directions.

[0043] After the welding of the cross beam and the energy absorption box is completed, the two driving members 41 are controlled to drive the two sliding plates 42 to move synchronously in the guiding groove 11 in the direction away from each other to the initial position. The sliding plate 42 drives the two positioning plates 44 to move synchronously through the compression spring 43, so that the positioning plate 44 no longer presses against the end of the cross beam.

[0044] Refer to Figure 1 、 Figure 3 and Figure 4 As shown in, the locking group 12 includes a locking plate 122 installed on the upper side of the mounting seat through a plurality of elastic support rods 121. A plurality of locking grooves 123 are uniformly arranged in the front and back directions corresponding to the positions of the locking rods 35 on the locking plate 122. The locking grooves 123 are used to cooperate with the corresponding locking rods 35 to lock the square plate 34.

[0045] Refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in, a lifting plate 13 is slidably installed on the upper side of the mounting seat and is located on the back sides of the left and right locking plates 122. An inclined surface matching the locking plate 122 is provided at the upper end of the side of the lifting plate 13 close to the middle of the welding base 1. 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 the front and rear 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 towards each other, and the welding surfaces of the energy absorption box and the cross beam are tightly pressed together, at this time, the sliding plate 42 drives the L-shaped plate 421 to move towards the middle of the welding base 1 to the corresponding position of the lifting plate 13 and contacts the corresponding lifting plate 13. The two sliding plates 42 continue to move towards each other, and the L-shaped plate 421 pushes the lifting plate 13 to move towards the middle of the welding base 1. The inclined surface of the lifting plate 13 drives the corresponding locking plate 122 to move upward and stretch the elastic support rod 121. The locking rod 35 is inserted into the locking groove 123 of the locking plate 122 corresponding to its position, realizing the position locking of the square plate 34, so that the two clamping blocks 33 rigidly clamp and fix the cross 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 resilience of the return spring 14. The locking plate 122 moves downward to the initial position under the resilience 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 locking of the square plate 34.

[0048] Refer to Figure 1 、 Figure 3 and Figure 5 As shown in, the alignment unit 5 includes a transmission block 52 slidably mounted up and down by a jacking spring 51 on the opposite sides of two positioning plates 44. Adjusting groups 53 are installed on the opposite sides of the two transmission blocks 52. A clamping group 54 for vertically clamping the energy absorption box is installed on the adjusting group 53. The adjusting group 53 is used to adjust the position of the energy absorption box clamped by the clamping group 54 according to the welding position on the cross 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 fits against the end of the cross beam and the sliding plate 42 continues to move, the linkage group 45 finally drives the energy absorption box to press tightly against the upper side of the cross beam through the transmission block 52.

[0049] The alignment unit 5 is used to vertically clamp the energy absorption box and align the crossbeam; specifically, first, according to the distance between the preset welding area of the crossbeam and the corresponding end, the adjustment group 53 is controlled to adjust the position of the clamping group 54, and then two energy absorption boxes are respectively placed 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 crossbeam and the corresponding end. The clamping group 54 can vertically clamp the energy absorption box. When the two positioning plates 44 move towards each other until they fit against the crossbeam end and stop moving, the positioning plate 44 finally drives the energy absorption box clamped by the clamping group 54 to move to a position corresponding to the upper part of the preset welding area of the crossbeam and stop moving through the transmission block 52. Therefore, when welding crossbeam assemblies of different specifications, it can ensure the precise alignment of the energy absorption box and the preset welding area of the crossbeam, and ensure the quality of the welded crossbeam assembly.

[0050] When the two positioning plates 44 are attached to the left and right ends of the crossbeam and the two sliding plates 42 continue to move towards each other, the linkage group 45 drives the transmission block 52 to move downward and compress 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 and press tightly against the upper side of the crossbeam through the adjustment group 53. At this time, the two clamping blocks 33 pre-clamp the crossbeam, so that the lower side of the crossbeam can be pressed tightly against the two U-shaped seats 31 under the downward pressing action of the energy absorption box. And because the crossbeam is centered left and right with the welding base 1 under the extrusion of the two positioning plates 44, the contact positions between the crossbeam and the two U-shaped seats 31 are symmetrically arranged left and right with the middle of the welding base 1 as the reference. Thus, the crossbeam can be symmetrically arranged left and right with the middle of the welding base 1 under the pressing action of the energy absorption box, that is, the two preset welding areas of the crossbeam are symmetrically arranged left and right with the middle of the welding base 1 as the reference, and the energy absorption box is vertically arranged and pressed tightly against the upper side of the preset welding area of the crossbeam, so that the welding surfaces of the energy absorption box and the crossbeam are in close contact, preventing welding gaps between the welding surfaces of the energy absorption box and the crossbeam, ensuring the welding quality of the energy absorption box and the crossbeam. Then, the two clamping blocks 33 rigidly clamp and fix the crossbeam, and control the welding robot 2 to weld the crossbeam and the energy absorption box together.

[0051] When the welding of the crossbeam and the energy absorption box is completed and the two positioning plates 44 move back to the initial position in the direction away from each other, the positioning plate 44 finally drives the two clamping groups 54 to move away from each other to the initial position through the transmission block 52, and the clamping group 54 can automatically release the clamping and fixing of the energy absorption box, thus facilitating the quick removal of the welded crossbeam assembly and increasing the welding efficiency of the crossbeam assembly.

[0052] Refer to Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 and Figure 8, the adjusting group 53 includes fixing plates 531 fixedly installed on the opposite sides of the two transmission blocks 52. U-shaped adjusting plates 532 are distributed on the opposite sides of the two fixing plates 531. Support guide rods 533 are fixedly installed at the rear ends of the opposite sides of the two adjusting plates 532, and the support guide rods 533 are slidably connected to the left and right of the fixing plates 531. Adjusting screws 534 are rotatably installed at the front ends of the opposite sides of the two adjusting plates 532, and the adjusting screws 534 are threadedly connected to the corresponding fixing plates 531.

[0053] Refer to Figure 3 , Figure 5 , Figure 7 and Figure 8 , the clamping group 54 includes clamping blocks 542 slidably installed back and forth on the front and rear inner walls of the adjusting plates 532 through a plurality of elastic pushing rods 541 arranged evenly 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. A plurality of elastic pushing rods 541 corresponding to the same clamping block 542 slide back and forth through the adjusting plates 532 and are jointly fixedly installed 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] Refer to Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 10 , the clamping group 54 further includes an alignment plate 546 slidably installed up and down on the upper side of the adjusting plate 532 through a plurality of elastic pressing rods 545. The lower end of the side of the alignment plate 546 close to the middle of the welding base 1 is set as an inclined surface; wherein, the lower surface of the alignment plate 546 is in contact with the upper surface of the clamping block 542.

[0055] The adjusting group 53 is used to adjust the position of the clamped energy absorption box, and the clamping group 54 is used to vertically clamp the energy absorption box; first, according to the distance between the preset welding area of the cross beam and the corresponding end, turn the adjusting screw 534. Under the guiding action of the support guide rod 533, the adjusting screw 534 drives the adjusting plate 532 to move a certain distance towards the direction close to the middle of the welding base 1, so that the distance between the inner wall of the horizontal longitudinal section of the adjusting plate 532 and the positioning plate 44 is the same as the distance between the preset welding area of the cross beam and the corresponding end. The adjusting plate 532 drives the corresponding two clamping blocks 542 to move through the elastic pushing rods 541. Then, the energy absorption box is placed into the adjusting plate 532 from between the inclined surfaces of the two clamping blocks 542 with the welding surface facing downwards, and the energy absorption box is in contact with the inner wall of the horizontal longitudinal section of the adjusting plate 532.

[0056] During the process of placing the energy-absorbing box into the adjusting plate 532, the energy-absorbing box drives the clamping block 542 to move away from the middle of the adjusting plate 532 through the inclined plane of the clamping block 542, and compresses the elastic ejecting rod 541. After the energy-absorbing box is placed, under the action of the resilience of the elastic ejecting rod 541, the opposite side planes of the two clamping blocks 542 corresponding to the adjusting plate 532 can continuously pre-clamp the energy-absorbing box; and during the process of placing the energy-absorbing box into the adjusting plate 532, the connecting bracket on the energy-absorbing box and the inclined plane of the alignment plate 546 cooperate to drive the alignment plate 546 to move upward and stretch the elastic pressing rod 545. After the energy-absorbing box is placed, the alignment plate 546 abuts against the upper side of the connecting bracket on the energy-absorbing box under the action of the resilience of the elastic pressing rod 545, so as to vertically arrange the energy-absorbing box. When the two positioning plates 44 move towards each other to the end of the cross beam and stop moving, at this time, the two clamping blocks 542 drive the energy-absorbing box to move above the preset welding area of the cross beam, and the two clamping blocks 542 clamp the upper end of the energy-absorbing box, thus not affecting the welding operation of the welding robot on the energy-absorbing box and the cross beam.

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

[0058] When the adjusting plate 532 is at the extreme position close to one side of the fixing plate 531, at this time, the pushing plate 423 contacts the sliding plate 535. After 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 towards each other to the end of the cross beam and stop moving, and the sliding plate 42 continues to move, the sliding plate 42 drives the pushing plate 423 to move towards the middle of the welding base 1 through the pushing rod 422. When the pushing plate 423 contacts the sliding plate 535 and continues to move, the pushing plate 423 pushes the sliding plate 535 to move towards the middle of the welding base 1 and compresses the guiding spring 536, so that the round rod 544 is inserted into the round hole of the sliding plate 535 corresponding to its position, thereby realizing the position locking of the matching plate 543, enabling the clamping block 542 to clamp and fix the energy absorption box, ensuring the stability during welding. At the same time, the linkage group 45 finally drives the energy absorption box clamped and fixed by the clamping block 542 to move downward and abut against the cross beam through the transmission block 52. During this process, the pushing plate 423 always contacts the sliding plate 535. When the sliding plate 535 moves to the extreme position close to the middle of the welding base 1, at this time, the telescopic structure of the pushing rod 422 can be compressed.

[0059] When the welding of the cross beam assembly is completed and the two positioning plates 44 move back, 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 resilience of the guiding spring 536, so that the round rod 544 moves out of the round hole at the corresponding position, thereby releasing the position locking of the matching plate 543, enabling the clamping block 542 to elastically pre-clamp the energy absorption box after welding. When the two positioning plates 44 finally drive the corresponding two clamping blocks 542 to move away from the middle of the welding base 1 to the initial position through the transmission block 52, at this time, the energy absorption box automatically moves out between the clamping blocks 542, thereby facilitating the quick removal of the welded cross beam assembly and improving the welding efficiency of the cross beam assembly.

[0060] Refer to Figure 1 、 Figure 5 and Figure 6 As shown in, the linkage group 45 includes a linkage plate 451 fixedly installed at the upper end of the transmission block 52, and the upper end of the linkage plate 451 slidably penetrates through the positioning plate 44 up and down. Square shells 452 are fixedly installed at the upper ends of the opposite sides of the two sliding plates 42. Lower pressing plates 454 are slidably installed left and right on the opposite sides of the two square shells 452 through connecting springs 453. The lower ends of the opposite sides of the two lower pressing plates 454 are both provided with inclined surfaces that cooperate with the linkage plate 451, and the inclined surfaces of the lower pressing plates 454 are in contact with the upper end of the linkage plate 451; among them, the upper end of the side where the inclined surface of the linkage plate 451 is located is provided with an arc-shaped structure, and the elastic force of the connecting spring 453 is much greater than the elastic force of the top extension spring 51.

[0061] Refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 10 , on both the front and rear inner walls of the square shell 452 near one side of the middle of the welding base 1, elastic limiting rods 455 are slidably installed in the front and rear directions, and the elastic limiting rods 455 are in contact with the lower pressing plate 454. On both the front and rear sides of the lower pressing plate 454 and near one side of the middle of the welding base 1, limiting grooves are provided, and the limiting grooves are used to cooperate with the elastic limiting rods 455 to limit the position of the lower pressing 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 provided with inclined surfaces.

[0062] The linkage group 45 is used to drive the energy absorption box to press tightly against the upper side of the cross beam; specifically, when the two positioning plates 44 move towards each other to the end of the cross beam and stop moving, and the sliding plate 42 continues to move, the sliding plate 42 finally drives the two lower pressing plates 454 to move towards each other through the square shell 452. The inclined surface of the lower pressing plate 454 cooperates with the linkage plate 451 to move the transmission block 52 downward, and the transmission block 52 finally drives the energy absorption box clamped and fixed by the two clamping blocks 542 to move downward. When the energy absorption box moves to contact the cross beam and the lower pressing plate 454 continues to move, at this time, the lower pressing plate 454 compresses the connecting spring 453 under the blocking action of the non - continuously movable linkage plate 451.

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

[0064] When the two sliding plates 42 start to move away from each other, the lower pressing plate 454 will move away from the corresponding sliding plate 42 relative to the square shell 452 under the resilience 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 abuts against the lower pressing plate 454 and elastically contracts and deforms itself, and the lower pressing plate 454 finally moves to the initial position. When the two positioning plates 44 start to move away from each other and separate from the crossbeam end, the positioning plates 44 finally drive 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, and the position locking of the matching plate 543 is released. The two clamping blocks 542 elastically pre-clamp the energy absorption box. At the same time, since the alignment plate 546 abuts 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 abuts against the upper side of the clamping block 542, blocking the upward movement of the clamping block 542, so before the two clamping blocks 542 are completely separated from the connecting bracket, the transmission block 52 will not return to the initial position under the action of the top extension spring 51. When the two clamping blocks 542 are completely separated from the connecting bracket, at this time, under the resilience of the top extension spring 51, the transmission block 52 returns to the initial position again.

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

Claims

1. An automatic welding system for automobile bumper beam assembly, comprising a welding base, a welding robot is installed on the welding base, and two left-right symmetrical clamping units are installed on the upper side of the welding base, the clamping units are used to clamp the beam, and the characteristics are: 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, and the positioning unit includes a sliding plate connected to the guide groove by a driving member and slidingly connected to the guide groove left and right, and the two sliding plates are installed with positioning plates on opposite sides through a plurality of pressure springs evenly arranged up and down, and the positioning plates are also installed in the guide groove by sliding left and right; The calibration unit includes a transmission block mounted on opposite sides of two positioning plates by sliding up and down through a top extension spring, and an adjustment group is mounted on opposite sides of the two transmission blocks, and a clamping group for vertically clamping the energy absorption box is mounted on the adjustment group, and 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 crossbeam; A linkage group is connected between the transmission block, the positioning plate and the sliding plate. When the positioning plate is fitted 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.

2. The automatic welding system for automobile bumper beam assembly according to claim 1 is 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 seats are located on opposite sides of the two positioning plates, and the front and rear inner walls of the U-shaped seats are 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 arranged as inclined surfaces, and a plurality of elastic clamping rods corresponding to the same clamping block slide back and forth through the U-shaped seats and are fixedly mounted with a square plate together, 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 is characterized in that: A locking group is installed at the position of the square plate at 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 position of the locking plate corresponding to the locking rod is provided with a plurality of locking grooves evenly arranged front and back, and the locking grooves are used to cooperate with the corresponding locking rods to lock the square plate.

4. The automatic welding system for automobile bumper beam assembly according to claim 3 is characterized in that: A lifting plate is slidably installed on the upper side of the welding base and is located on the opposite sides of the left and right locking plates. An upper end of the lifting plate close to the middle of the welding base is provided with an inclined surface that matches 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 front and rear ends of the sliding plate.

5. The automatic welding system for automobile bumper beam assembly according to claim 1 is characterized in that: 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 opposite sides of the two adjustment plates, and the support guide rods and the fixed plates are slidably connected to the left and right, and adjustment screws are rotatably installed on the front ends of the opposite sides of the two adjustment plates, and the adjustment screws are threadedly connected to the corresponding fixed plates.

6. The automatic welding system for automobile bumper beam assembly according to claim 5, characterized in that: The clamping group includes clamping blocks that are slidably installed 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. A round rod is fixedly installed on the side of the matching plate away from the middle of the welding base.

7. The automatic welding system for automobile bumper beam assembly according to claim 6, characterized in that: Sliding plates are installed on both sides of the front and rear of the adjusting plate and at one end away from the middle of the welding base for sliding movement left and right. A guide spring is connected between the sliding plate and the adjusting 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 both 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.

8. The automatic welding system for automobile bumper beam assembly according to claim 5, characterized in that: The clamping group also includes a positioning plate that is slidably mounted on the upper side of the adjustment plate through 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.

9. The automatic welding system for automobile bumper beam assembly according to claim 1, characterized in that: 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 arranged to be inclined surfaces matching the linkage plate, and the inclined surfaces of the lower pressure plates are arranged in contact with the upper ends of the linkage plates.

10. The automatic welding system for automobile bumper beam assembly according to claim 9, characterized in that: The front and rear inner walls of the square shell are both slidably installed with elastic limit rods on one side close to the middle of the welding base, and the elastic limit rods are arranged in contact with the lower pressure plate. Limiting grooves are provided on both sides of the front and rear of the lower pressure plate and on one 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. The ends of the two elastic limit rods on the opposite sides and away from the middle of the welding base are both arranged as inclined surfaces.

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