Motorcycle frame welding clamp and welding method

Abstract

The invention discloses a motorcycle frame welding fixture and a welding method. The clamp comprises a support, a cross beam rotationally arranged on the support, and a first clamping assembly, a second clamping assembly and a third clamping assembly which are arranged on the cross beam. The angle and the height of the first clamping assembly can be adjusted to fix the headstock pipe; the second clamping assembly and the third clamping assembly achieve centering clamping of the frame through the synchronous clamping assembly, the third clamping assembly can ascend and descend, and the positions of the second clamping assembly and the third clamping assembly can be adjusted according to the length of the frame. The synchronous clamping assembly enables clamping blocks to move synchronously through a synchronous rotating shaft and other structures. In addition, the device is further provided with a first rotating disc capable of switching stations, universal wheels convenient to move and a control panel capable of being accurately controlled. The welding method comprises the steps of adjusting the position of the headstock pipe, adjusting the position of the sliding plate, clamping the frame, conducting welding operation, switching stations and the like. The welding precision and efficiency are improved, the working intensity of operators is relieved, and universality and operation convenience are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, in particular to a motorcycle frame welding fixture and a welding method. Background Art

[0002] The motorcycle frame provides structural support for the entire motorcycle. It is like the skeleton of the motorcycle, connecting the engine, wheels, suspension system, seat, fuel tank and other components together so that they can work together. The strength and rigidity of the frame determine the stability and safety of the motorcycle during driving. If the frame is not strong enough, it may be deformed or even broken when driving at high speeds, making sharp turns or encountering bumpy roads, seriously affecting the life safety of the rider.

[0003] In the prior art, there is a method for using a rear fork welding fixture for an off-road motorcycle frame with a publication number of "CN106624533A", which belongs to the field of welding application technology, and the steps are: step one: adjusting the position of the lifting ear positioning support in the welding fixture for the rear fork of the off-road motorcycle frame; step two: positioning the components of the rear fork of the frame corresponding to the supports on the upper end surface of the tooling bottom plate; step three: pushing the quick chuck I to clamp the rear fork shaft positioning pin on its top into the inner hole of the rear fork shaft; step four: pushing the quick chuck II to push the rear wheel fixing plate against the rear fork positioning support, and the rear fork positioning pin passes through the fixing groove on the rear wheel fixing plate and is engaged in the rear fork positioning hole on the rear fork positioning support; step five: adjusting the position of the lifting ear positioning support to engage the shock absorber seat lifting ear with the shock absorber seat positioning spacer; step six: after the rear fork of the frame is fixed, welding is performed. The technical solution of the present invention enables the rear fork of the frame to be accurately positioned during the welding process, ensures the accuracy of the size of the rear fork of the frame after welding, and improves the welding efficiency.

[0004] However, the existing technology still has major deficiencies, such as:

[0005] In the prior art, there are many obvious drawbacks when performing welding operations on motorcycle frames, especially in the welding process between the head tube and the frame body. First, operators often need to operate multiple clamps to clamp and fix the frame body. This process is not only cumbersome and complicated, but also greatly increases the labor intensity of the processing personnel. Secondly, the fixing method of the head tube is extremely limited, and it cannot be flexibly adjusted according to the angle and height of the head tube of different specifications. As a result, in the actual welding process, it is impossible to adapt well to various specifications of head tubes, which seriously affects the welding accuracy of the frame and the head tube. Summary of the invention

[0006] The object of the present invention is to provide a motorcycle frame welding fixture and a welding method to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A motorcycle frame welding fixture comprises a bracket, a crossbeam is rotatably arranged on the bracket, and a first clamping assembly, a second clamping assembly and a third clamping assembly are fixedly arranged on the crossbeam;

[0009] The first clamping assembly includes a first fixing plate fixedly arranged on the crossbeam, a first rotating rod is rotatably arranged on the first fixing plate, a first sliding sleeve is slidably arranged on the first rotating rod, a first connecting plate is arranged on the first sliding sleeve, a first supporting shaft is fixedly arranged on the first connecting plate, and the first supporting shaft is used to fix the head tube of the frame;

[0010] The second clamping assembly comprises a second sliding block slidably arranged on the crossbeam, a support frame is fixedly arranged on the second sliding block, and the support frame on the second sliding block is provided with a symmetrical second clamping block through a synchronous clamping assembly;

[0011] The third clamping assembly comprises a third sliding block slidably arranged on the crossbeam, the third sliding block is provided with a support frame for fixing the rear fork of the frame through a lifting assembly, the support frame on the third sliding block is provided with a symmetrical third clamping block through a synchronous clamping assembly, and a third support shaft is fixedly arranged on the third clamping block;

[0012] The second clamping assembly is linked with the third clamping assembly synchronization assembly.

[0013] Preferably, the synchronous clamping assembly comprises a synchronous shaft rotatably arranged in the support frame, a synchronous gear is rotatably arranged on the synchronous shaft, a symmetrically arranged guide rail is arranged on the side wall of the support frame, a plurality of synchronous sliders are slidably arranged on the guide rail, a synchronous rack is fixedly arranged on the synchronous slider, the synchronous rack is meshed with the synchronous gear, and the synchronous rack on the guide rail is centrally symmetrically arranged around the synchronous shaft;

[0014] The support frame is provided with a support slot, the synchronous rack is fixedly provided with a sliding plate, the sliding plate penetrates and is slidably provided in the support slot, and the second clamping block and the third clamping block are respectively fixedly connected with the corresponding sliding plates.

[0015] Preferably, the lifting assembly includes a third mounting block fixedly arranged on the third sliding block, a telescopic cylinder is fixedly arranged on the third mounting block, a third fixing block is fixedly arranged on the movable end of the telescopic cylinder, and the third fixing block is fixedly connected to the support frame on the third sliding block;

[0016] The third mounting block is provided with a plurality of guide holes, guide rods are slidably arranged in the plurality of guide holes, and one end of the guide rods is fixedly connected to the third fixing block.

[0017] Preferably, the synchronization component comprises a second rotating shaft rotatably arranged on a second sliding block, a synchronization spline shaft is slidably arranged in the second rotating shaft, the synchronization spline shaft is rotatably arranged on a third sliding block, a driving bevel gear is fixedly sleeved on the second rotating shaft and the synchronization spline shaft, a driven bevel gear is fixedly sleeved on the synchronization rotating shaft, and the driving bevel gear is meshed with the driven bevel gear for transmission;

[0018] The synchronous rotating shaft installed in the third clamping assembly includes a third rotating shaft and a third spline shaft, wherein the third spline shaft is slidably arranged in the third rotating shaft, the third spline shaft penetrates the third rotating shaft, and one end of the third spline shaft is fixedly connected to the driven bevel gear;

[0019] The second rotating shaft and the synchronous spline shaft are both fixedly arranged on the second sliding block and the third sliding block through shaft plates, and a through groove for the shaft plate to slide is opened on the crossbeam.

[0020] Preferably, an arc groove is formed on the first fixing plate around the rotation center of the first rotating rod, and a first locking bolt is provided on the first rotating rod, and the first locking bolt is slidably disposed in the arc groove;

[0021] The first locking bolt can be used to fix the first rotating rod on the first fixing plate at different angles;

[0022] The first sliding sleeve is slidably arranged on the first rotating rod, a first pad is arranged between the first sliding sleeve and the first rotating rod, a threaded boss is fixedly arranged on the first sliding sleeve, a first screw is rotatably arranged in the threaded boss, and by tightening the first screw, the first screw squeezes the first pad and the first rotating rod to achieve the fixing of the first sliding sleeve on the first rotating rod, thereby achieving the fixing of the head tubes of different heights;

[0023] The first rotating disk is rotatably arranged on the first sliding sleeve, and the first connecting plates are arranged on the first rotating disk in a circular array.

[0024] Preferably, a positioning rack is fixedly provided at the bottom of the crossbeam, and a positioning gear is rotatably provided on the second sliding block and the third sliding block, and the positioning gear is meshed with the positioning rack;

[0025] The bracket is fixedly provided with an axle seat, the crossbeam is rotatably provided on the bracket through the axle seat, a worm wheel is fixedly provided at one end of the crossbeam, a worm engaged with the worm wheel is fixedly provided on the bracket, and the worm wheel, the positioning gear and one end of the synchronous spline shaft are all connected with a stepping motor;

[0026] The stepper motor driving the worm is fixed on the bracket, the stepper motor driving the positioning gear is fixed on one end of the second sliding block and the third sliding block, and the stepper motor driving the synchronous spline shaft is fixed on one end of the shaft plate.

[0027] Preferably, the third clamping block includes a fixed clamping plate and a movable clamping plate, a plurality of guide sleeves are fixedly provided on the fixed clamping plate, a guide column is slidably provided in the guide sleeve, the movable clamping plate is fixedly provided at one end of the guide column, an adjusting bolt is rotatably provided on the fixed clamping plate, a threaded sleeve is fixedly provided on the movable clamping plate, the adjusting bolt cooperates with the threaded sleeve, and the third support shaft is fixedly provided at one end of the movable clamping plate.

[0028] Preferably, a second clamping frame is rotatably provided on the second clamping block, and an arc-shaped groove is provided on the second clamping frame.

[0029] Preferably, a control panel is fixedly provided on the bracket, a universal wheel is fixedly provided on the bottom of the bracket, and a travel switch is fixedly provided on the movable clamping plate.

[0030] A welding method, based on the above-mentioned motorcycle frame welding fixture, comprises the following steps:

[0031] S1: adjusting the position of the first rotating rod on the first fixing plate according to the angle of the head tube, and adjusting the position of the first sliding sleeve on the first rotating rod according to the height of the head tube, and fixing the head tubes by the first locking bolt and the first screw, so as to sleeve the head tubes on the first connecting plate on the first rotating disk;

[0032] S2: adjusting the positions of the second slide plate and the third slide plate by using a stepper motor according to the length of the frame, so that the second slide plate corresponds to the bottom position of the frame, and the third slide plate corresponds to the tail of the frame;

[0033] S3: placing the vehicle frame on the second clamping assembly and the third clamping assembly, the second clamping frame supports the bottom of the vehicle frame, the third support shaft supports the tail position of the vehicle frame, starting the stepper motor on the shaft plate, and centering and clamping the vehicle frame body at the same time through the synchronous assembly and the synchronous clamping assembly. When both travel switches touch the vehicle frame, the stepper motor stops rotating;

[0034] S4: After clamping, align the head tube with the frame and perform welding operation on the two;

[0035] S5: After welding is completed, the welded frame is removed, the first turntable is rotated to rotate the head pipe of the next station to the working position, and the frame installation steps are repeated to weld the next frame.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The synchronous clamping assembly enables the second clamping block and the third clamping block to move synchronously through the coordination of the synchronous rotating shaft, synchronous gear, synchronous rack and other structures, so as to realize the centering clamping of the frame, ensure the balance and stability of the clamping, thereby improving the welding accuracy and reducing the workload of the operator;

[0038] The first clamping assembly can be adjusted and fixed according to the angle and height of the head tube, adapting to head tubes of different specifications, thus ensuring accurate welding of the frame and the head tube;

[0039] The fixed clamping plate and the movable clamping plate in the third clamping block can be fine-tuned on the position of the movable clamping plate through the cooperation of the guide sleeve, the guide column, the adjusting bolt and the threaded sleeve, thereby further improving the clamping accuracy of the rear part of the frame.

[0040] 2. The first rotating disk rotatably arranged on the first sliding sleeve and the first connecting plates in a circular array enable multiple head tubes to have additional workstations. After welding a head tube, the first rotating disk can be quickly rotated to switch to the next workstation, thereby improving welding efficiency;

[0041] The coordination between the various components can quickly and accurately complete the clamping and positioning of the frame, reducing the preparation time before welding, thereby improving the overall work efficiency;

[0042] 3. The second sliding block and the third sliding block can slide on the crossbeam and can adjust their positions according to the length of the frame to adapt to frames of different lengths;

[0043] The lifting assembly can adjust the height of the third clamping assembly to adapt to vehicle frames of different heights, thereby improving the versatility of the device.

[0044] 4. The universal wheels at the bottom of the bracket facilitate the movement of the entire device, allowing the device to be used flexibly in different work sites.

[0045] The operation of each stepper motor can be controlled through the control panel to achieve precise control of operations such as the rotation of the crossbeam, the sliding of the sliding block and the rotation of the synchronous spline shaft, and the operation is simple and convenient.

[0046] The adjustable angle of the first rotating rod on the first fixing plate and the adjustable height of the first sliding sleeve on the first rotating rod, as well as the fine-adjustable design of the third clamping block, all enable the device to be quickly adjusted according to actual needs during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the three-dimensional structure of the vehicle frame of the present invention placed on the device;

[0048] Figure 2 It is the front view of the present invention;

[0049] Figure 3 It is a schematic diagram of the three-dimensional structure of the overall structure of the present invention;

[0050] Figure 4 This is a schematic diagram of the three-dimensional structure of the crossbeam of the present invention when viewed from above;

[0051] Figure 5 It is a schematic diagram of the three-dimensional structure of the second clamping assembly of the present invention;

[0052] Figure 6 It is a schematic diagram of the three-dimensional structure of the second clamping assembly of the present invention when viewed from above;

[0053] Figure 7 It is a schematic diagram of the three-dimensional structure of the third clamping assembly of the present invention;

[0054] Figure 8 It is a schematic diagram of the three-dimensional structure of the third clamping assembly of the present invention when viewed from above;

[0055] Fig. 9 It is a schematic diagram of the three-dimensional structure of the meshing of the worm wheel and the worm of the present invention;

[0056] Fig.10 It is a schematic diagram of the three-dimensional structure of the linkage between the second clamping assembly and the third clamping assembly of the present invention (some parts are hidden in the transparent state);

[0057] Fig.11 It is a schematic diagram of the three-dimensional structure of the second clamping assembly (transparent hidden parts) of the present invention;

[0058] Fig.12 It is a schematic diagram of the three-dimensional structure of the third clamping assembly (transparent and hidden parts) of the present invention;

[0059] Fig.13 It is a schematic diagram of the three-dimensional structure of the first clamping assembly of the present invention;

[0060] Fig.14 It is a schematic diagram of the three-dimensional structure of the lifting assembly of the present invention;

[0061] Fig.15 This is a front view of the linkage between the second clamping assembly and the third clamping assembly of the present invention;

[0062] Fig.16 This is a top view of the linkage between the second clamping assembly and the third clamping assembly of the present invention.

[0063] In the figure: 1, bracket; 2, crossbeam; 3, support frame; 4, first clamping assembly; 41, first fixed plate; 411, arc groove; 42, first rotating rod; 43, first sliding sleeve; 44, first connecting plate; 45, first supporting shaft; 46, first locking bolt; 47, first pad; 48, first screw; 49, first rotating disk; 5, second clamping assembly; 51, second sliding block; 52, second clamping block; 53, second clamping frame; 6, third clamping assembly; 61, third sliding block; 62, third clamping block; 621, fixed clamping plate; 622, guide sleeve; 623, guide column; 624, movable clamping plate; 625, threaded sleeve; 626, adjusting bolt; 63, third supporting shaft; 7, synchronous Clamping assembly; 71, synchronous rotating shaft; 72, synchronous gear; 73, guide rail; 74, synchronous slider; 75, synchronous rack; 76, supporting slide groove; 77, sliding plate; 8, lifting assembly; 81, third mounting block; 82, telescopic cylinder; 83, third fixed block; 84, guide hole; 85, guide rod; 9, synchronous assembly; 91, second rotating shaft; 92, synchronous spline shaft; 93, driving bevel gear; 94, driven bevel gear; 95, third rotating shaft; 96, third spline shaft; 97, shaft plate; 98, through groove; 10, positioning rack; 11, positioning gear; 12, shaft seat; 13, worm wheel; 131, worm; 14, stepping motor; 15, control panel; 16, universal wheel; 17, travel switch. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] See also Figure 1-16 , the present invention provides a technical solution:

[0066] Embodiment 1:

[0067] The motorcycle frame welding fixture in this embodiment is as follows: Figure 1 As shown, it mainly includes a stable bracket 1, on which a crossbeam 2 is rotatably arranged through rotating parts such as bearings, so that the crossbeam 2 can be rotated and adjusted on the bracket 1. Three key clamping components are fixedly arranged on the crossbeam 2: a first clamping component 4, a second clamping component 5 and a third clamping component 6, which are respectively used to clamp different parts of the frame.

[0068] like Fig.13As shown, the first clamping assembly 4 specifically includes a first fixed plate 41, which is firmly mounted on the crossbeam 2 by fasteners such as bolts. A first rotating rod 42 is rotatably arranged on the first fixed plate 41, and the rotating rod and the fixed plate are connected by a bearing so that the rotating rod can rotate freely. A first sliding sleeve 43 is slidably arranged on the first rotating rod 42, and a clearance fit or a slide rail structure is adopted between the sliding sleeve and the rotating rod to ensure that the sliding sleeve can slide smoothly on the rotating rod. A first connecting plate 44 is fixedly arranged on the first sliding sleeve 43, and the connecting plate and the sliding sleeve are connected by welding or fasteners. A first supporting shaft 45 is fixedly arranged on the first connecting plate 44, and the supporting shaft is used to insert and fix the head tube of the frame, so as to achieve a stable clamping of the front part of the frame.

[0069] like Figure 5 and Figure 6 As shown, the second clamping assembly 5 includes a second sliding block 51, and the sliding plate 77 is slidably arranged on the cross beam 2 through a linear guide 73 or a sliding member such as a slider, and can move linearly along the cross beam 2. The second sliding block 51 is fixedly provided with a support frame 3, and the support frame 3 is connected to the sliding plate 77 by welding or fasteners. The support frame 3 is provided with a symmetrically arranged second clamping block 52 through a synchronous clamping assembly 7, which is used to clamp the middle part of the frame.

[0070] like Figure 7 and Figure 8 As shown, the third clamping assembly 6 includes a third sliding block 61, and the sliding plate 77 is also slidably arranged on the crossbeam 2 through a linear guide 73 or a sliding member such as a slider. The third sliding block 61 is provided with a support frame 3 for fixing the rear flat fork of the frame through a lifting assembly 8, and the connection between the support frame 3 and the sliding plate 77 is flexible and can adapt to frames of different heights. The support frame 3 on the third sliding block 61 is also provided with a symmetrical third clamping block 62 through a synchronous clamping assembly 7, and a third support shaft 63 is fixedly arranged on the third clamping block 62 to further stabilize the rear part of the frame.

[0071] like Fig.11 and 12 As shown, the synchronous clamping assembly 7 mainly includes a synchronous shaft 71 rotatably arranged in the support frame 3. This design enables the synchronous shaft 71 to rotate freely in the support frame 3 to provide power for the subsequent clamping action. A synchronous gear 72 is also rotatably arranged on the synchronous shaft 71, and the synchronous gear 72 cooperates with the synchronous rack 75 described later to achieve synchronous movement of the clamping block.

[0072] Furthermore, symmetrically arranged guide rails 73 are provided on the side walls of the support frame 3, and this design ensures the stability and accuracy of the clamping action. A plurality of synchronous sliders 74 are slidably provided on the guide rails 73, and these synchronous sliders 74 can slide freely on the guide rails 73 to provide stable support and guidance for the clamping block.

[0073] A synchronous rack 75 is also fixedly arranged on the synchronous slider 74, and the synchronous rack 75 meshes with the aforementioned synchronous gear 72. When the synchronous gear 72 rotates, it drives the synchronous rack 75 to slide on the guide rail 73, thereby realizing the reverse synchronous movement of the clamping block (such as Fig.16 As shown, the direction of movement of the components is already shown in the figure). It is worth noting that the synchronous rack 75 on the guide rail 73 is arranged symmetrically around the synchronous rotating shaft 71, and this design ensures the balance and stability of the clamping action.

[0074] In addition, a support slot 76 is provided on the support frame 3, and this design provides a sliding space for the sliding plate 77. The sliding plates 77 are fixedly provided on the synchronous rack 75, and these sliding plates 77 penetrate and slide in the support slot 76. When the synchronous rack 75 slides on the guide rail 73, the sliding plate 77 will also slide in the support slot 76 accordingly, thereby driving the clamping block to move.

[0075] Finally, the second clamping block 52 and the third clamping block 62 are fixedly connected to the corresponding sliding plates 77, respectively. When the sliding plate 77 slides in the supporting slide groove 76, it will drive the second clamping block 52 and the third clamping block 62 to move synchronously, thereby clamping and fixing the motorcycle frame. This design not only improves the stability and accuracy of clamping, but also greatly improves the efficiency and flexibility of the welding fixture. When the synchronous shaft 71 rotates, it will drive the synchronous gear 72 to rotate. Since the synchronous rack 75 is engaged with the synchronous gear 72, the synchronous rack 75 will slide on the guide rail 73 in the opposite direction, thereby driving the second clamping block 52 and the third clamping block 62 to move synchronously, thereby achieving the centering clamping of the frame (such as Fig.15 and 16 As shown, the direction of movement of the components is indicated in the figure).

[0076] like Fig.14 As shown, the lifting assembly 8 is used to adjust the height of the third clamping assembly 6 to adapt to frames of different heights. It specifically includes a third mounting block 81 fixedly set on the third sliding block 61, a telescopic cylinder 82 is fixedly set on the third mounting block 81, a third fixed block 83 is fixedly set on the movable end of the telescopic cylinder 82, and the third fixed block 83 is fixedly connected to the support frame 3 on the third sliding block 61. When the telescopic cylinder 82 is extended and retracted, it will drive the third fixed block 83 and the support frame 3 connected thereto to rise and fall, thereby achieving support and clamping of the tail of the frame of different heights. In order to ensure the stability of the lifting process, a plurality of guide holes 84 are opened on the third mounting block 81, and a guide rod 85 is slidably set in the guide hole 84, and one end of the guide rod 85 is fixedly connected to the third fixed block 83 to play a guiding and stabilizing role.

[0077] like Fig.10 and15 As shown, the synchronization component 9 is used to realize the synchronous movement of the second clamping component 5 and the third clamping component 6. It specifically includes a second rotating shaft 91 rotatably set on the second sliding block 51, and a synchronous spline shaft 92 is slidably set in the second rotating shaft 91, and the synchronous spline shaft 92 is rotatably set on the third sliding block 61. A driving bevel gear 93 is fixedly sleeved on the second rotating shaft 91 and the synchronous spline shaft 92, and a driven bevel gear 94 is fixedly sleeved on the synchronous rotating shaft 71. The driving bevel gear 93 and the driven bevel gear 94 are meshed and transmitted. When the synchronous spline shaft 92 rotates, it will drive the second rotating shaft 91 to rotate synchronously through the spline, and then drive the two driving bevel gears 93 to rotate. The driving bevel gear 93 is then meshed with the driven bevel gear 94 to drive the synchronous rotating shaft 71 to rotate, and finally realize the rotation of the synchronous gear 72 and the sliding of the synchronous rack 75, so that the second clamping block 52 and the third clamping block 62 move synchronously, and complete the centering clamping of the frame;

[0078] At the same time, a through slot 98 for the axis plate 97 to slide is provided on the cross beam 2, which not only ensures the stability of the axis plate 97, but also allows it to have a certain sliding space to meet different welding requirements.

[0079] Through the above arrangement, even if the distances between the second clamping assembly 5 and the third clamping assembly 6 are different, the synchronous clamping assembly 7 on the second clamping assembly 5 and the third clamping assembly 6 can be opened and closed synchronously to achieve stable clamping of the frame;

[0080] In particular, if Fig.12 As shown, the synchronous rotating shaft 71 installed in the third clamping assembly 6 is composed of a third rotating shaft 95 and a third spline shaft 96. The third spline shaft 96 can not only slide in the third rotating shaft 95, but also drive the third rotating shaft 95 to rotate synchronously. This design ensures that even if the telescopic cylinder 82 is extended and retracted to change the height of the support frame 3 on the third sliding block 61, the synchronous rotating shaft 71 can also drive the synchronous gear 72 to rotate normally, thereby achieving support and clamping of the rear of the frame at different heights.

[0081] Embodiment 2:

[0082] This embodiment is further optimized based on the first embodiment.

[0083] like Fig.13 As shown, an arc groove 411 is formed on the first fixing plate 41 around the rotation center of the first rotating rod 42. A first locking bolt 46 is provided on the first rotating rod 42, and the first locking bolt 46 is slidably disposed in the arc groove 411. With this design, when the angle of the first rotating rod 42 needs to be adjusted, the first locking bolt 46 can be loosened, and after sliding to a desired position in the arc groove 411, the first locking bolt 46 can be tightened, thereby achieving the first rotating rod 42 being fixed on the first fixing plate 41 at different angles.

[0084] The first sliding sleeve 43 is slidably disposed on the first rotating rod 42. A first pad 47 is disposed between the first sliding sleeve 43 and the first rotating rod 42. A threaded boss is fixedly disposed on the first sliding sleeve 43, and a first screw 48 is rotatably disposed in the threaded boss. When the position of the first sliding sleeve 43 on the first rotating rod 42 needs to be fixed, the first screw 48 can be tightened to squeeze the first pad 47 and the first rotating rod 42, thereby achieving the fixing of the first sliding sleeve 43 on the first rotating rod 42. In this way, head pipes of different heights can be adapted and fixed.

[0085] A first turntable 49 is also rotatably arranged on the first sleeve 43, and the first connecting plates 44 are arranged in a circumferential array on the first turntable 49. Such a design enables the first connecting plates 44 to rotate around the first turntable 49, and multiple first connecting rods can increase the number of working positions of the head pipe, making the welding efficiency higher.

[0086] like Figure 4 , Figure 6 , Figure 7 As shown, a positioning rack 10 is fixedly provided at the bottom of the crossbeam 2. A positioning gear 11 is rotatably provided on each of the second sliding block 51 and the third sliding block 61, and both positioning gears 11 are meshed with the positioning rack 10. A shaft seat 12 is fixedly provided on the bracket 1, and the crossbeam 2 is rotatably provided on the bracket 1 through the shaft seat 12. A worm gear 13 is fixedly provided at one end of the crossbeam 2, and a worm 131 meshed with the worm gear 13 is fixedly provided on the bracket 1. A stepper motor 14 is connected to the worm 131, the positioning gear 11, and one end of the synchronous spline shaft 92.

[0087] Specifically, the stepper motor 14 driving the worm 131 is fixedly mounted on the bracket 1; the stepper motor 14 driving the positioning gear 11 is fixedly mounted on one end of the second sliding block 51 and the third sliding block 61 respectively; and the stepper motor 14 driving the synchronous spline shaft 92 is fixedly mounted on one end of the shaft plate 97. With such a design, the rotation of the beam 2, the positions of the second sliding block 51 and the third sliding block 61 on the beam 2, and the rotation of the synchronous spline shaft 92 can be controlled respectively, thereby achieving more precise adjustment.

[0088] like Figure 7As shown, the third clamping block 62 includes a fixed clamping plate 621 and a movable clamping plate 624. A plurality of guide sleeves 622 are fixedly arranged on the fixed clamping plate 621, and guide posts 623 are slidably arranged in these guide sleeves 622. The movable clamping plate 624 is fixedly arranged at one end of the guide post 623. An adjusting bolt 626 is also rotatably arranged on the fixed clamping plate 621, and a threaded sleeve 625 is fixedly arranged on the movable clamping plate 624. The adjusting bolt 626 cooperates with the threaded sleeve 625, and the movable clamping plate 624 can be pushed to move along the guide post 623 by rotating the adjusting bolt 626, thereby realizing fine adjustment of the position of the movable clamping plate 624. The third support shaft 63 is fixedly arranged at one end of the movable clamping plate 624.

[0089] like Fig.11 As shown, a second clamping frame 53 is rotatably provided on the second clamping block 52, and an arc-shaped groove is provided on the second clamping frame 53. Such a design enables the second clamping frame 53 to adapt to objects of different shapes and provide more stable support.

[0090] like Figure 1 As shown, a control panel 15 is fixedly provided on the bracket 1 for controlling the operation of each stepper motor 14. A universal wheel 16 is fixedly provided at the bottom of the bracket 1 to facilitate the movement of the entire device. A travel switch 17 is also fixedly provided on the movable clamping plate 624 for detecting the moving position of the movable clamping plate 624 and controlling the stop of the stepper motor 14.

[0091] Working principle: During the use of the present invention, when performing motorcycle frame welding operations, first adjust the position of the first rotating rod 42 on the first fixing plate 41 according to the angle of the head tube, and achieve angle fixation of the first rotating rod 42 by sliding and tightening the first locking bolt 46 in the arc groove 411. Then adjust the position of the first sliding sleeve 43 on the first rotating rod 42 according to the height of the head tube, tighten the first screw 48, so that the first screw 48 squeezes the first pad 47 and the first rotating rod 42, and achieves the fixation of the first sliding sleeve 43, thereby adapting to head tubes of different heights. A plurality of head tubes are sleeved on the first connecting plate 44 on the first rotating disk 49.

[0092] Then, according to the length of the vehicle frame, the position of the second sliding block 51 and the third sliding block 61 on the cross beam 2 is adjusted by using the stepping motor 14 driving the positioning gear 11. The positioning gears 11 on the second sliding block 51 and the third sliding block 61 are meshed with the positioning rack 10 at the bottom of the cross beam 2, and the stepping motor 14 drives the positioning gear 11 to rotate, so that the second sliding block 51 and the third sliding block 61 slide on the cross beam 2, so that the second sliding block 51 corresponds to the bottom position of the vehicle frame, and the third sliding block 61 corresponds to the tail of the vehicle frame.

[0093] The frame is placed on the second clamping assembly 5 and the third clamping assembly 6. The second clamping frame 53 on the second clamping block 52 supports the bottom of the frame, and the third support shaft 63 on the third clamping block 62 supports the tail position of the frame. The stepper motor 14 on the start shaft plate 97 rotates the synchronous spline shaft 92, and drives the second rotating shaft 91 to rotate synchronously through the spline. The synchronous spline shaft 92 and the second rotating shaft 91 drive the two driving bevel gears 93 to rotate, and the driving bevel gears 93 mesh with the driven bevel gear 94 to drive the synchronous rotating shaft 71 to rotate. The synchronous gear 72 on the synchronous rotating shaft 71 rotates and meshes with the synchronous rack 75, so that the synchronous rack 75 slides on the guide rail 73 in the opposite direction. The sliding plate 77 on the synchronous rack 75 drives the second clamping block 52 and the third clamping block 62 to move synchronously to achieve the centering clamping of the frame. When both travel switches 17 contact the frame, the stepper motor 14 stops rotating.

[0094] Since the synchronous rotating shaft 71 installed in the third clamping assembly 6 is composed of the third rotating shaft 95 and the third spline shaft 96, the third spline can not only slide in the third rotating shaft 95, but also drive the third rotating shaft 95 to slide synchronously. Therefore, even if the telescopic cylinder 82 is extended and retracted, and the height of the support frame 3 on the third sliding block 61 changes, the synchronous rotating shaft 71 on the third sliding block 61 can also drive the synchronous gear 72 to rotate, thereby achieving support and clamping of the rear of the frame at different heights. (e.g. Fig.15 and 16 As shown, the direction of movement of the components is indicated in the figure).

[0095] After clamping, the head tube is aligned with the frame and the two are welded. The operator can choose manual welding or welding robot welding according to the actual situation. The specific welding method is not limited in this embodiment. After welding, the welded frame is removed, the first rotating disk 49 is rotated to rotate the head tube of the next station to the working position, and the frame installation steps are repeated to weld the next frame.

[0096] A welding method:

[0097] S1: The position of the first rotating rod 42 on the first fixing plate 41 is adjusted according to the angle of the head tube, and the position of the first sliding sleeve 43 on the first rotating rod 42 is adjusted according to the height of the head tube, and the head tubes are fixed by the first locking bolt 46 and the first screw 48, and the head tubes are sleeved on the first connecting plate 44 on the first rotating disk 49;

[0098] S2: adjusting the positions of the second slide plate and the third slide plate by using the stepping motor 14 according to the length of the frame, so that the second slide plate corresponds to the bottom position of the frame, and the third slide plate corresponds to the tail of the frame;

[0099] S3: Place the vehicle frame on the second clamping assembly 5 and the third clamping assembly 6, the second clamping frame 53 supports the bottom of the vehicle frame, the third support shaft 63 supports the tail position of the vehicle frame, start the stepper motor 14 on the shaft plate 97, and simultaneously center and clamp the vehicle frame body through the synchronization assembly 9 and the synchronization clamping assembly 7. When both travel switches 17 contact the vehicle frame, the stepper motor 14 stops rotating;

[0100] S4: After clamping, align the head tube with the frame and weld them together (the operator can choose manual welding or welding robot welding according to the actual situation);

[0101] S5: After welding is completed, the welded frame is removed, the first rotating disk 49 is rotated to rotate the head pipe of the next station to the working position, and the frame installation steps are repeated to weld the next frame.

[0102] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A motorcycle frame welding fixture, comprising a bracket (1), on which a crossbeam (2) is rotatably arranged, characterized in that: A first clamping assembly (4), a second clamping assembly (5) and a third clamping assembly (6) are fixedly arranged on the crossbeam (2); The first clamping assembly (4) comprises a first fixing plate (41) fixedly arranged on the crossbeam (2), a first rotating rod (42) being rotatably arranged on the first fixing plate (41), a first sliding sleeve (43) being slidably arranged on the first rotating rod (42), a first connecting plate (44) being arranged on the first sliding sleeve (43), a first supporting shaft (45) being fixedly arranged on the first connecting plate (44), and the first supporting shaft (45) being used for fixing the head tube of the frame; The second clamping assembly (5) comprises a second sliding block (51) slidably arranged on the crossbeam (2), a support frame (3) being fixedly arranged on the second sliding block (51), and the support frame (3) on the second sliding block (51) being provided with a symmetrical second clamping block (52) via a synchronous clamping assembly (7); The third clamping assembly (6) comprises a third sliding block (61) slidably arranged on the crossbeam (2); the third sliding block (61) is provided with a support frame (3) for fixing the rear fork of the frame through a lifting assembly (8); the support frame (3) on the third sliding block (61) is provided with a symmetrical third clamping block (62) through a synchronous clamping assembly (7); and a third support shaft (63) is fixedly arranged on the third clamping block (62); The second clamping assembly (5) is linked to the third clamping assembly (6) and the synchronization assembly (9).

2. A motorcycle frame welding fixture according to claim 1, characterized in that: The synchronous clamping assembly (7) comprises a synchronous rotating shaft (71) rotatably arranged in a support frame (3), a synchronous gear (72) rotatably arranged on the synchronous rotating shaft (71), a symmetrically arranged guide rail (73) is arranged on the side wall of the support frame (3), a plurality of synchronous sliding blocks (74) are slidably arranged on the guide rail (73), a synchronous rack (75) is fixedly arranged on the synchronous sliding block (74), the synchronous rack (75) is meshed with the synchronous gear (72), and the synchronous rack (75) on the guide rail (73) is arranged around the synchronous rotating shaft (71) in a centrally symmetrical manner; The support frame (3) is provided with a support slot (76), the synchronous rack (75) is fixedly provided with a sliding plate (77), the sliding plate (77) penetrates and is slidably provided in the support slot (76), and the second clamping block (52) and the third clamping block (62) are respectively fixedly connected to the corresponding sliding plates (77).

3. A motorcycle frame welding fixture according to claim 2, characterized in that: The lifting assembly (8) comprises a third mounting block (81) fixedly mounted on the third sliding block (61), a telescopic cylinder (82) fixedly mounted on the third mounting block (81), a third fixing block (83) fixedly mounted on the movable end of the telescopic cylinder (82), and the third fixing block (83) fixedly connected to the support frame (3) on the third sliding block (61); The third mounting block (81) is provided with a plurality of guide holes (84), guide rods (85) are slidably arranged in the guide holes (84), and one end of the guide rod (85) is fixedly connected to the third fixing block (83).

4. A motorcycle frame welding fixture according to claim 3, characterized in that: The synchronization component (9) comprises a second rotating shaft (91) rotatably arranged on a second sliding block (51), a synchronization spline shaft (92) being slidably arranged in the second rotating shaft (91), the synchronization spline shaft (92) being rotatably arranged on a third sliding block (61), a driving bevel gear (93) being fixedly sleeved on the second rotating shaft (91) and the synchronization spline shaft (92), a driven bevel gear (94) being fixedly sleeved on the synchronization rotating shaft (71), and the driving bevel gear (93) and the driven bevel gear (94) being meshed and transmitted; The synchronous rotating shaft (71) installed in the third clamping assembly (6) comprises a third rotating shaft (95) and a third spline shaft (96), wherein the third spline shaft (96) is slidably arranged in the third rotating shaft (95), the third spline shaft (96) passes through the third rotating shaft (95), and one end of the third spline shaft (96) is fixedly connected to the driven bevel gear (94); The second rotating shaft (91) and the synchronous spline shaft (92) are both fixedly arranged on the second sliding block (51) and the third sliding block (61) via a shaft plate (97), and a through groove (98) for the shaft plate (97) to slide is provided on the crossbeam (2).

5. The motorcycle frame welding fixture according to claim 4, characterized in that: An arc-shaped groove (411) is formed on the first fixing plate (41) around the rotation center of the first rotating rod (42); a first locking bolt (46) is provided on the first rotating rod (42); and the first locking bolt (46) is slidably disposed in the arc-shaped groove (411); The first locking bolt (46) can be used to fix the first rotating rod (42) on the first fixing plate (41) at different angles. The first sliding sleeve (43) is slidably arranged on the first rotating rod (42), a first pad (47) is arranged between the first sliding sleeve (43) and the first rotating rod (42), a threaded boss is fixedly arranged on the first sliding sleeve (43), a first screw (48) is rotatably arranged in the threaded boss, and by tightening the first screw (48), the first screw (48) squeezes the first pad (47) and the first rotating rod (42), thereby achieving the fixing of the first sliding sleeve (43) on the first rotating rod (42), thereby achieving the fixing of head pipes of different heights; A first rotating disk (49) is rotatably arranged on the first sliding sleeve (43), and first connecting plates (44) are arranged on the first rotating disk (49) in a circular array.

6. The motorcycle frame welding fixture according to claim 3, characterized in that: A positioning rack (10) is fixedly provided at the bottom of the crossbeam (2), and a positioning gear (11) is rotatably provided on the second sliding block (51) and the third sliding block (61), and the positioning gear (11) is meshed with the positioning rack (10); A shaft seat (12) is fixedly arranged on the bracket (1), the crossbeam (2) is rotatably arranged on the bracket (1) via the shaft seat (12), a worm wheel (13) is fixedly arranged on one end of the crossbeam (2), a worm (131) meshing with the worm wheel (13) is fixedly arranged on the bracket (1), and the worm (131), the positioning gear (11) and one end of the synchronous spline shaft (92) are all connected to a stepping motor (14); The stepper motor (14) driving the worm (131) is fixedly arranged on the bracket (1), the stepper motor (14) driving the positioning gear (11) is fixedly arranged on one end of the second sliding block (51) and the third sliding block (61), and the stepper motor (14) driving the synchronous spline shaft (92) is fixedly arranged on one end of the shaft plate (97).

7. The motorcycle frame welding fixture according to claim 4, characterized in that: The third clamping block (62) includes a fixed clamping plate (621) and a movable clamping plate (624), a plurality of guide sleeves (622) are fixedly arranged on the fixed clamping plate (621), a guide column (623) is slidably arranged in the guide sleeve (622), the movable clamping plate (624) is fixedly arranged on one end of the guide column (623), an adjusting bolt (626) is rotatably arranged on the fixed clamping plate (621), a threaded sleeve (625) is fixedly arranged on the movable clamping plate (624), the adjusting bolt (626) cooperates with the threaded sleeve (625), and the third support shaft (63) is fixedly arranged on one end of the movable clamping plate (624).

8. The motorcycle frame welding fixture according to claim 4, characterized in that: A support plate is rotatably arranged on the second clamping block (52), and an arc-shaped groove is formed on the support plate.

9. The motorcycle frame welding fixture according to claim 7, characterized in that: A control panel (15) is fixedly arranged on the bracket (1), a universal wheel (16) is fixedly arranged at the bottom of the bracket (1), and a travel switch (17) is fixedly arranged on the movable clamping plate (624).

10. A welding method, based on a motorcycle frame welding fixture as described in any one of claims 1 to 9 above, characterized in that: The following steps are involved: S1: adjusting the position of the first rotating rod (42) on the first fixing plate (41) according to the angle of the head tube, and adjusting the position of the first sliding sleeve (43) on the first rotating rod (42) according to the height of the head tube, and fixing the head tubes by means of a first locking bolt (46) and a first screw (48), so as to sleeve a plurality of head tubes on the first connecting plate (44) on the first rotating disk (49); S2: using a stepper motor (14) to adjust the positions of the second slide plate and the third slide plate according to the length of the frame, so that the second slide plate corresponds to the bottom position of the frame, and the third slide plate corresponds to the rear of the frame; S3: placing the vehicle frame on the second clamping assembly (5) and the third clamping assembly (6), the support plate supports the bottom of the vehicle frame, the third support shaft (63) supports the rear of the vehicle frame, the stepper motor (14) on the shaft plate (97) is started, and the main body of the vehicle frame is simultaneously centered and clamped through the synchronization assembly (9) and the synchronization clamping assembly (7), and when both travel switches (17) contact the vehicle frame, the stepper motor (14) stops rotating; S4: After clamping, align the head tube with the frame and perform welding operation on the two; S5: After welding is completed, the welded frame is removed, the first rotating disk (49) is rotated to rotate the head pipe of the next station to the working position, and the frame installation steps are repeated to weld the next frame.

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