Engine hood welding positioning device

Abstract

The present application belongs to the technical field of automobile accessory processing equipment, and particularly relates to an engine cover welding positioning device, which comprises a base, a movable sliding seat is arranged in the base, a rotatable adjusting support is arranged above the movable sliding seat, a rotary adjusting mechanism is arranged on the support, an object carrier shaped like an isosceles triangle is arranged at the output end of the rotary adjusting mechanism, a splicing moving assembly is arranged above the object carrier, a splicing adjusting assembly is arranged at the output end of the splicing moving assembly, a carrier plate is arranged at the output end of the splicing adjusting assembly, a pressure cylinder is arranged outside the carrier plate, an extension pressure mechanism is arranged above the carrier plate on one side, and a linkage driving mechanism is arranged at the geometric center of the object carrier. The present application can replace manual work to complete the pre-splicing of workpieces, can adjust the splicing position of the workpieces in real time, can improve the accuracy of the splicing of the workpieces, can guarantee the forming quality of the workpieces, can improve the work progress, and can meet the use requirements.

Description

Technical Field

[0001] This invention belongs to the technical field of automotive parts processing equipment, and particularly relates to an engine hood welding positioning device. Background Technology

[0002] The engine underbody protection plate, commonly known in the industry as the engine hood, is a large-sized, irregularly shaped stamped sheet metal part. In actual production, it is usually formed by splicing and welding at least two separate sheet metal substrates, and it is a core component of the vehicle's chassis protection system. In existing processing technology, the welding positioning operation of this type of engine hood generally adopts a horizontal pre-assembly positioning scheme. During processing, the two sets of separate workpieces to be welded need to be placed simultaneously on a horizontal tooling table. The horizontal docking and pre-assembly of the two workpieces are achieved by manual pushing and alignment before clamping and welding.

[0003] The existing horizontal pre-assembly and docking process has certain drawbacks: First, the overall contour of the workpiece is irregular, with many curved ribs and mounting bosses. When horizontally laying and docking, the two workpieces are only limited by the contact of the plane edges, without a multi-dimensional synchronous constraint structure. The splicing process requires repeated adjustments to the placement angle and displacement of the workpieces in all directions, making the pre-assembly operation process cumbersome and complicated. Moreover, the positioning method that only relies on the plane edge limit lacks vertical and lateral synchronous limit references, which can easily lead to problems such as uneven gap width between the two workpieces and edge misalignment. The positioning accuracy is insufficient, and after welding, defects such as weld seam offset, inconsistent welding fusion amount, and out-of-tolerance overall forming contour dimensions are likely to occur, which greatly reduces the processing and forming quality of the engine hood and increases the subsequent rework and scrap costs.

[0004] Secondly, existing horizontal pre-assembly and docking work largely relies on manual labor, with operators visually calibrating and manually moving workpieces to achieve alignment. This involves long hours of repetitive alignment work, resulting in high labor intensity. Furthermore, manual calibration and alignment are subject to individual operational errors, and the pre-assembly time for a single workpiece is unstable. This limits the progress of mass production of vehicle parts, leading to low production efficiency and making it difficult to meet the mass production requirements of modern automated stamping and welding production lines. Therefore, this paper proposes an engine hood welding positioning device that can replace manual labor to achieve convenient workpiece alignment. Summary of the Invention

[0005] This invention addresses the technical problems existing in the pre-assembly and positioning process of engine hoods mentioned above, and proposes an engine hood welding positioning device that is reasonably designed, simple in structure, easy to process, and can replace manual pre-assembly of workpieces. It can also achieve real-time adjustment based on the workpiece assembly position, improve the accuracy of workpiece alignment and assembly, ensure workpiece forming quality, improve work process, and effectively meet the usage requirements.

[0006] To achieve the above objectives, the present invention provides a welding positioning device for an engine hood, comprising a base, a movable slide seat within the base, a rotatably adjustable support frame above the movable slide seat, a stabilizing rod on the other side of the support frame, the other end of the stabilizing rod being connected to the base, a rotation adjustment cylinder within the movable slide seat, a first connecting rod on the inner side of the support frame, the inner side of the first connecting rod being connected to the rotation adjustment cylinder, a second connecting rod connected to the movable slide seat at the end of the first connecting rod, a rotation adjustment mechanism on the support frame, a carrying frame with an isosceles triangular shape at the output end of the rotation adjustment mechanism, a base plate within the carrying frame, a splicing moving assembly above the carrying frame, a splicing adjustment assembly at the output end of the splicing moving assembly, a carrier plate at the output end of the splicing adjustment assembly, a pressing cylinder on the outer side of the carrier plate, an extending pressing mechanism above one side of the carrier plate, and a linkage drive mechanism at the geometric center of the carrying frame.

[0007] Preferably, the rotation adjustment mechanism includes a rotating disk mounted on a support frame, an mounting plate on the outer side of the rotating disk, a positioning hole inside the rotating disk, a positioning drive cylinder on the inner side of the support frame, and a positioning rod at the output end of the positioning drive cylinder, which is inserted into and corresponds to the positioning hole.

[0008] Preferably, the splicing moving assembly includes a first lead screw moving mechanism, a slide is provided above the first lead screw moving mechanism and connected to the splicing adjustment assembly, a transmission wheel is provided on the outer side of the first lead screw moving mechanism, and a first transmission belt is provided between the two transmission wheels on the same side.

[0009] Preferably, the assembly adjustment component includes a movable seat connected to the slide, a second lead screw moving mechanism is provided inside the movable seat, an ear seat is provided on the outer side of the movable seat, a rotating plate is provided on the ear seat, an extension plate is provided on the inner side of the rotating plate, a rotating rod is provided on the outer side of the moving end of the second lead screw moving mechanism, and the other end of the rotating rod is rotatably connected to the extension plate, and a rotating wheel is provided on the outer side of the second lead screw moving mechanism.

[0010] Preferably, a connecting frame is provided between the two splicing and adjusting components on the same side, support plates are provided on both sides of the base plate, a rotatable limiting rod is provided between the two support plates, a transmission roller is provided on the limiting rod, a limiting roller is provided on the connecting frame located on both sides of the transmission roller, and a second transmission belt is provided on the rotating wheel, the limiting roller, the transmission roller and the limiting roller.

[0011] Preferably, the linkage drive mechanism includes a first transmission rod and a second transmission rod disposed on the outside of the splicing moving assembly. A worm gear for receiving driving power is disposed on the outside of the second lead screw moving mechanism. A worm gear meshing with the worm gear is disposed on the second transmission rod. A first bevel gear is disposed at the end of the first transmission rod. A split coupling is disposed at the end of the second transmission rod and connected to the first transmission rod. An extension rod is disposed on the outside of the limiting rod. A movable and adjustable second bevel gear is disposed on the extension rod. A movable sleeve with an I-shaped cross-section is disposed on one side of the second bevel gear. A power switching mechanism is disposed on the base plate for switching the meshing of the first bevel gear and the second gear and the separation of the split coupling.

[0012] Preferably, the separating coupling includes a first coupling disc disposed at the end of the first transmission rod, a telescopic rod with splines disposed inside the end of the second transmission rod, an adjusting sleeve with an I-shaped cross-section disposed on the outside of the telescopic rod, a second coupling disc disposed on one side of the adjusting sleeve, and wedge-shaped end faces provided on the end faces of the first coupling disc and the second coupling disc to achieve meshing.

[0013] Preferably, the power switching mechanism includes a rotating gear mounted on a base plate, a first adjusting rack mounted on the base plate below the limiting rod, a first connecting sleeve mounted on the first adjusting rack and engaging with a movable sleeve, a second adjusting rack mounted above the first adjusting rack, the first and second adjusting racks being arranged at right angles and both engaging with the rotating gear, a second connecting sleeve mounted above the second adjusting rack and engaging with the adjusting sleeve, and a limiting cover mounted on the base plate and slidably connected to the second adjusting rack.

[0014] Preferably, the extended pressing mechanism includes an L-shaped extension frame mounted on a rotating plate. The extension frame has housings on both sides, and a lifting rod is installed inside the housing. A top plate is installed above the lifting rod, and a base plate is installed below the top plate. A pressure rod arranged in an inclined manner is installed below the top plate and slides relative to the base plate. A telescopic spring is sleeved on the outside of the lifting rod located below the base plate.

[0015] Preferably, the extension frame is provided with a pressure drive cylinder, and a linkage plate is provided below the lifting rod and connected to the output end of the pressure drive cylinder.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. This invention features an adjustable tilt support structure. Through the linkage of a movable slide, a support frame, a rotating adjustment cylinder, and a connecting rod, the tilt angle of the carrier can be continuously adjusted steplessly. This allows it to adapt to the welding requirements of different weld angles on the engine hood, making it highly adaptable. In addition, with the assistance of a stabilizer bar, the adjustment process is smooth and reliable. The overall structure has good rigidity, effectively ensuring the stability of the welding operation.

[0017] 2. The present invention is equipped with a rotary positioning mechanism, which relies on a rotating disk and positioning holes in conjunction with a positioning drive cylinder and a positioning rod to achieve circumferential angle adjustment and mechanical locking. It can perform multi-directional angle positioning of the workpiece, meet the welding requirements of polygonal and irregular welds, effectively avoid workpiece displacement caused by welding vibration, significantly improve welding positioning accuracy and product forming consistency, and reduce welding misalignment defect rate.

[0018] 3. This invention employs a synchronous splicing moving component in conjunction with a flip-up splicing and adjusting component. The transmission wheel and the first transmission belt enable the synchronous operation of the double-sided lead screw mechanism, ensuring that the spacing between the workpieces on both sides is adjusted synchronously without deviation. At the same time, the linkage structure of the lead screw, rotating rod and extension plate is used to achieve the upper and lower interlocking splicing and docking of the workpieces, effectively improving the problems of large gaps and poor misalignment accuracy in traditional docking, and significantly improving the splicing and fitting accuracy of the engine hood and the overall welding quality.

[0019] 4. This invention features a linkage-type power switching mechanism and a separate coupling. Through a single set of rotating gears and a double rack structure, the power transmission path can be switched synchronously and precisely, enabling flexible switching between workpiece translation adjustment and flipping / assembly conditions without the need for multiple independent drives. Combined with a spline telescopic and wedge-shaped meshing coupling structure, the transmission is backlash-free, the clutch response is fast, the overall machine structure is simplified, manufacturing costs and failure rates are reduced, and the equipment's operational stability is improved.

[0020] 5. The present invention adds an extended pressing mechanism to adapt to irregularly shaped workpieces. By using the linkage structure of inclined pressing rod, telescopic spring and cylinder, it can achieve multi-point adaptive pressing on the outer edge of the engine hood and the opening position. The pressing is uniform and can adapt to the thickness of the plate, effectively suppressing welding warping deformation and workpiece loosening, avoiding rigid pressure damage to the workpiece, and greatly improving the welding flatness and product yield.

[0021] 6. This invention adopts a limit rod spline sliding and follow-up transmission structure, which enables the splicing and adjustment components to receive power stably during translation, realizing independent control of translation adjustment and angle splicing actions without interference. The equipment has high integration, small space occupation, adaptability to various work positions and working conditions, and strong versatility.

[0022] 7. This invention has a high degree of integration and automation. It can complete the entire process of engine hood posture adjustment, spacing adjustment, fitting and splicing, multi-point pressing and precise positioning in one go. It replaces the tedious operation of traditional manual alignment and manual pressing, effectively shortens the clamping and positioning time, improves welding processing efficiency, reduces manual labor intensity, is suitable for mass production line production, and has high industrial promotion value. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a welding positioning device for an engine hood; Figure 2 This is a structural schematic diagram of an engine hood welding positioning device from another perspective. Figure 3 A side view of the structure of an engine hood welding positioning device; Figure 4 This is a schematic diagram of the base structure; Figure 5 This is a schematic diagram of the rotary adjustment mechanism; Figure 6 This is a schematic diagram of the shelf structure; Figure 7 A schematic diagram illustrating the structure for the assembly of the moving components and the adjusting components. Figure 8 A structural diagram illustrating the location of the linkage drive mechanism; Figure 9 This is an enlarged schematic diagram of a portion of the linkage drive mechanism; Figure 10 This is a magnified schematic diagram of a local structure from another perspective of the linkage drive mechanism; Figure 11 This is a schematic diagram of the assembly and adjustment components; Figure 12 A schematic diagram of the internal structure of the extended pressing mechanism; In the above figures, 1. Base; 11. Movable slide; 111. Support frame; 112. Stabilizing rod; 113. Rotary adjustment cylinder; 114. First connecting rod; 115. Second connecting rod; 2. Rotary adjustment mechanism; 21. Rotating disk; 211. Positioning hole; 22. Mounting disk; 23. Positioning drive cylinder; 24. Positioning rod; 3. Carrier; 31. Base plate; 32. Support plate; 33. Limiting rod; 331. Transmission roller; 332. Extension rod; 4. Splicing moving assembly; 41. First lead screw moving mechanism; 411. Worm gear; 42. Slide; 43. Transmission wheel; 44. First transmission belt; 5. Splicing adjustment assembly; 51. Movable seat; 52. Second lead screw moving mechanism; 521. Rotating rod; 53. Ear seat; 54. Rotating plate; 55. Extension plate; 56. Rotating wheel; 6. Connecting frame; 61. 62. Limiting roller; 7. Second transmission belt; 8. Carrier plate; 9. Pressing cylinder; 10. Extending pressing mechanism; 11. Outer frame; 12. Housing; 13. Lifting rod; 14. Top plate; 15. Chassis; 16. Pressing rod; 17. Telescopic spring; 18. Pressing drive cylinder; 19. Linkage plate; 10. Linkage drive mechanism; 11. First transmission rod; 12. First bevel gear; 13. Second transmission rod; 14. Worm gear; 15. Separate coupling; 16. First coupling disc; 17. Telescopic rod; 18. Adjusting sleeve; 19. Second coupling disc; 10. Second bevel gear; 10. Moving sleeve; 10. Power switching mechanism; 11. Rotating gear; 12. First adjusting rack; 13. First connecting sleeve; 14. Second adjusting rack; 15. Second connecting sleeve; 16. Limiting cover. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0026] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0027] Examples, such as Figures 1-12 As shown, an engine hood welding positioning device is used in the welding processing of automotive engine hood parts. It can realize multi-angle posture adjustment of the workpiece, bilateral synchronous splicing positioning and multi-point clamping and fixing, adapt to the welding positioning requirements of engine hoods of different specifications, and effectively improve welding alignment accuracy and work efficiency.

[0028] To achieve continuous adjustment of the overall operating angle of the device and adapt to the operating viewpoints and processing angles of different welding stations, the device includes a base 1. A laterally sliding movable slide 11 is installed inside the base 1. A rotatably adjustable support frame 111 is hinged above the movable slide 11. A stabilizing rod 112 is hinged to the other side of the support frame 111, and the other end of the stabilizing rod 112 is hinged to the base 1. A rotary adjusting cylinder 113 is installed inside the movable slide 111. A first connecting rod 114 is hinged to the inner side of the support frame 111, and the inner side of the first connecting rod 114 is hinged to the output end of the rotary adjusting cylinder 113. A second connecting rod 115 is hinged to the end of the first connecting rod 114, and the other end of the second connecting rod 115 is hinged to the movable slide 11. Specifically: when the rotary adjusting cylinder 113 extends, its output end pushes the first connecting rod 114 to rotate outward, simultaneously driving the movable slide block 11 to slide to one side along the base 1. With the support and limit of the second connecting rod 115, the support frame 111 rotates counterclockwise around the upper hinge point, realizing the adjustment of the tilt angle of the support frame 111. When the rotary adjusting cylinder 113 retracts, it pulls the first connecting rod 114 to rotate inward, driving the movable slide block 11 to slide in the opposite direction, making the support frame 111 rotate clockwise, realizing the adjustment of the tilt angle. The continuous adjustment of the overall working tilt angle can be completed by a single cylinder drive. The stabilizing rod 112 can provide auxiliary support for the support frame 111, avoiding swaying during the adjustment process and ensuring the stability of the angle adjustment and the overall load-bearing rigidity.

[0029] To achieve circumferential rotation and precise locking positioning of the support frame, and to meet the welding requirements of welds in different orientations of the workpiece, a rotation adjustment mechanism 2 is provided on the support frame 111. The output end of the rotation adjustment mechanism 2 is equipped with a support frame 3 designed in an isosceles triangular shape. The rotation adjustment mechanism 2 includes a rotating disk 21 mounted on the support frame 111, and a mounting disk 22 is provided on the outer side of the rotating disk 21. The mounting disk 22 is fixedly connected to the support frame 111. Several positioning holes 211 are circumferentially formed inside the rotating disk 21. A positioning drive cylinder 23 is provided on the inner side of the support frame 111. The output end of the cylinder 23 is equipped with a positioning rod 24, which is inserted into the positioning hole 211. Specifically, the rotating disk 21 can be driven by the built-in drive motor to rotate circumferentially, and simultaneously drive the carrier 3 and the upper workpiece to complete the angle deflection. When the target welding angle is reached, the positioning drive cylinder 23 extends and pushes the positioning rod 24 into the corresponding positioning hole 211 to form a circumferential lock, preventing the carrier 3 from shifting circumferentially during the welding process and ensuring the accuracy of the welding position. Multiple sets of positioning holes 211 can realize multiple angle adjustments to adapt to the processing orientation requirements of different welds.

[0030] To provide a stable mounting base for the upper adjustment mechanisms, a base plate 31 is fixedly installed inside the frame 3. Support plates 32 are symmetrically arranged on both sides of the base plate 31. A rotatable limiting rod 33 is supported between the two support plates 32. A transmission roller 331 is installed on the limiting rod 33. An extension rod 332 extends from the outside of the limiting rod 33 to receive external transmission power. The rod body of the limiting rod 33 is provided with a spline structure, so that the transmission roller 331 can rotate synchronously with the limiting rod 33 and slide along the axial direction of the limiting rod 33, which is adapted to the power transmission requirements during the movement of the assembly adjustment component 5.

[0031] To drive the splicing adjustment component to move along the inclined surface of the carrier and achieve a wide range of synchronous adjustment of the workpiece splicing spacing, a splicing moving component 4 is provided above the carrier 3. A splicing adjustment component 5 is provided at the output end of the splicing moving component 4. The splicing moving component 4 includes a first lead screw moving mechanism 41, which is arranged along the inclined direction of the carrier 3. A slide 42 is provided above the first lead screw moving mechanism 41 and is fixedly connected to the splicing adjustment component 5. A transmission wheel 43 is provided at the outer end of the first lead screw moving mechanism 41. A first transmission belt 44 is provided between the two transmission wheels 43 on the same side. Specifically, the two sets of first lead screw moving mechanisms 41 on the same side form a synchronous transmission with the first transmission belt 44 through the transmission wheels 43. When one set of first lead screw moving mechanisms 41 receives driving power, it can transmit the power synchronously to the other set through the first transmission belt 44, so that the two sliding blocks 42 on both sides move synchronously in the tilt direction, thereby driving the splicing adjustment component 5 to move synchronously, ensuring the synchronicity of the workpiece spacing adjustment on both sides, avoiding skewness, and providing a positional basis for the precise splicing of the workpieces.

[0032] To achieve workpiece flipping and assembly adjustment, allowing the workpieces on both sides to be joined by an up-and-down interlocking method, thus improving the accuracy and fit of the assembly positioning, an assembly adjustment component 5 is provided at the output end of the assembly moving component 4. A carrier plate 7 is provided at the output end of the assembly adjustment component 5, and a pressing cylinder 71 is provided on the outer side of the carrier plate 7. The assembly adjustment component 5 includes a movable seat 51 connected to the slide 42, a second lead screw moving mechanism 52 is provided inside the movable seat 51, and an ear seat 53 is provided on the outer side of the movable seat 51. A rotating plate 54 is hinged to the ear seat 53. An extension plate 55 is fixedly installed on the inner side of the plate 54. A rotating rod 521 is hinged to the outer side of the moving end of the second screw moving mechanism 52, and the other end of the rotating rod 521 is rotatably connected to the extension plate 55. A rotating wheel 56 is installed at the outer end of the second screw moving mechanism 52. A connecting frame 6 is provided between the two splicing adjustment components 5 on the same side. A limiting roller 61 is provided on the connecting frame 6 and is respectively arranged on both sides of the transmission roller 331. A second transmission belt 62 is wound around the rotating wheel 56, the limiting roller 61, the transmission roller 331 and the limiting roller 61.

[0033] Specifically: the driving power is transmitted to the transmission roller 331 via the limit rod 33, and then drives the rotating wheel 56 to rotate via the second transmission belt 62, thereby driving the second lead screw moving mechanism 52 to move, so that the moving end of the second lead screw moving mechanism 52 moves along the lead screw axis; when the moving end moves, it pushes the extension plate 55 through the rotating rod 521, causing the rotating plate 54 to rotate upward around the hinge point of the ear seat 53, so that the workpiece on the carrier plate 7 is gradually lifted upward from the state parallel to the inclined plane of the carrier 3, until the splicing ends of the workpieces on both sides are connected by the upper and lower interlocking method, which replaces the traditional planar connection method, which can effectively improve the accuracy of splicing alignment and avoid misalignment; the connecting frame 6 moves synchronously with the splicing adjustment component 5, and the limit roller 61 can always form a tension limit on the second transmission belt 62. With the spline structure on the limit rod 33, it can ensure that the splicing adjustment component 5 can still stably receive power input during the movement, realizing independent control of translation and angle adjustment without interference.

[0034] To achieve power switching between splicing movement and splicing flipping, and to simplify the device's drive system by completing multi-process adjustments through a single power input, a linkage drive mechanism 9 is installed at the geometric center of the shelf 3. The linkage drive mechanism 9 includes a first transmission rod 91 and a second transmission rod 92 located outside the splicing movement assembly 4. A worm gear 411 for receiving drive power is installed outside the first lead screw movement mechanism 41. A worm 921 meshing with the worm gear 411 is installed on the second transmission rod 92. The end of the first transmission rod 91 is provided with… The first bevel gear 911 and the end of the second transmission rod 92 are provided with a detachable coupling 93, which is detachably connected to the first transmission rod 91. The extension rod 332 on the outside of the limiting rod 33 is provided with a movable and adjustable second bevel gear 94. A movable sleeve 95 with an I-shaped cross-section is provided on one side of the second bevel gear 94. A power switching mechanism 10 is provided on the base plate 31 to synchronously switch the meshing state of the first bevel gear 911 and the second bevel gear 94, as well as the disengagement state of the detachable coupling 93.

[0035] To achieve controllable switching of power between the first and second transmission rods and to coordinate the switching of power paths, the split coupling 93 includes a first coupling disc 931 located at the end of the first transmission rod 91, and a telescopic rod 932 with splines located inside the end of the second transmission rod 92. The telescopic rod 932 can rotate synchronously with the second transmission rod 92 and can slide axially. An adjusting sleeve 933 with an I-shaped cross-section is located on the outer side of the telescopic rod 932. A second coupling disc 934 is located on one side of the adjusting sleeve 933. The opposing end faces of the first coupling disc 931 and the second coupling disc 934 have mutually matching wedge-shaped end faces. To achieve meshing transmission, specifically: when the adjusting sleeve 933 drives the telescopic rod 932 to move towards the first transmission rod 91, the second coupling disc 934 and the first coupling disc 931 engage with each other through the wedge-shaped end faces, realizing the synchronous transmission of power between the first transmission rod 91 and the second transmission rod 92; when the adjusting sleeve 933 drives the telescopic rod 932 to move in the opposite direction, the second coupling disc 934 separates from the first coupling disc 931, cutting off the power transmission between them. The spline fit structure ensures that the telescopic rod 932 maintains its torque transmission capability during sliding, the wedge-shaped end faces achieve precise engagement, the clutch action is stable and reliable, and there is no transmission backlash.

[0036] To achieve synchronous switching between two transmission states through a single component, ensuring the synchronicity and accuracy of power switching and avoiding timing deviations, a power switching mechanism 10 is provided on the base plate 31. The power switching mechanism 10 includes a rotating gear 101 mounted on the base plate 31, a first adjusting rack 102 mounted on the base plate 31 below the limit rod 33, a first connecting sleeve 1021 mounted on the first adjusting rack 102 and engaged with the moving sleeve 95, a second adjusting rack 103 mounted above the first adjusting rack 102, the first adjusting rack 102 and the second adjusting rack 103 arranged at right angles and both meshing with the rotating gear 101, a second connecting sleeve 1031 mounted above the second adjusting rack 103 and engaged with the adjusting sleeve 933, and a limit cover 104 mounted on the base plate 31 and slidably connected to the second adjusting rack 103.

[0037] Specifically: The rotating gear 101 is driven to rotate by an external drive component. When the rotating gear 101 rotates clockwise, it drives the first adjusting rack 102 to move laterally to one side. Through the first connecting sleeve 1021, it pushes the moving sleeve 95 to slide along the extension rod 332, causing the second bevel gear 94 to approach the first bevel gear 911 and complete meshing. At the same time, the rotating gear 101 drives the second adjusting rack 103 to move vertically downward. Through the second connecting sleeve 1031, it pulls the adjusting sleeve 933 to move outward, causing the two coupling discs of the split coupling 93 to separate. At this time, the power of the first transmission rod 91 will be transmitted to the limit rod 33 through the bevel gear pair, thereby driving the splicing adjustment. Component 5 performs a flipping action; conversely, when the rotating gear 101 rotates counterclockwise, the first adjusting rack 102 moves in the opposite direction, causing the second bevel gear 94 to separate from the first bevel gear 911, and the second adjusting rack 103 moves in the opposite direction to push the adjusting sleeve 933 to reset, so that the split coupling 93 re-engages. At this time, the power of the first transmission rod 91 is transmitted to the second transmission rod 92, driving the splicing moving component 4 to perform a translational action. The on and off of the two transmissions can be controlled synchronously by a single rotating gear 101. The switching action has high synchronization and there will be no action timing deviation. The limit cover 104 can constrain the sliding direction of the second adjusting rack 103 to avoid skew and jamming.

[0038] To achieve multi-point clamping and fixation of the workpiece edge at the opening, prevent local warping and deformation of the workpiece during welding, and improve welding quality, an extended pressing mechanism 8 is provided above one side of the carrier plate 7. The extended pressing mechanism 8 includes an L-shaped extension frame 81 mounted on the rotating plate 54. Housings 82 are provided on both sides of the extension frame 81. A lifting rod 83 that can be raised and lowered is provided inside the housing 82. A top plate 84 is provided above the lifting rod 83, and a base plate 85 is provided below the top plate 84. The base plate 85 is fixed to the upper part of the housing 82. A pressure rod 86 arranged in an inclined manner is hinged below the top plate 84. The pressure rod 86 passes through the base plate 85 and can slide relative to the base plate 85. A telescopic spring 87 is sleeved on the outside of the lifting rod 83 located below the base plate 85. A pressure drive cylinder 88 is provided on the extension frame 81, and a linkage plate 89 is provided below the lifting rod 83 and connected to the output end of the pressure drive cylinder 88.

[0039] Specifically: When it is necessary to clamp the workpiece, the pressure drive cylinder 88 extends, pushing the linkage plate 89 downward, which in turn moves the lifting rod 83 downward. The top plate 84 descends with the lifting rod 83 and pushes the pressure rod 86 outward and downward along the guide hole of the base plate 85, so that the lower end of the pressure rod 86 presses against the upper surface of the outer plate at the opening of the workpiece. The telescopic spring 87 provides adaptive buffering force, allowing the pressure rod 86 to automatically adjust the clamping amount according to the actual thickness of the workpiece, avoiding workpiece deformation caused by rigid clamping. Multiple sets of inclined pressure rods 86 can clamp the edge of the opening from multiple directions, with uniformly distributed clamping points, effectively preventing the workpiece edge from warping and deforming during welding. When the pressure drive cylinder 88 retracts, the lifting rod 83 rises and resets under the rebound action of the telescopic spring 87, driving the pressure rod 86 to retract, releasing the clamping of the workpiece, and facilitating the removal and placement of the workpiece.

[0040] The complete workflow of this device is as follows: First, the engine hood components to be welded are placed on the two side carrier plates 7 respectively. The pressing cylinder 71 on the outer side of the carrier plate 7 is extended by rotating and pressing down to press down and fix the outer edge of the workpiece. At the same time, the pressing drive cylinder 88 of the extension pressing mechanism 8 is operated to make the pressure rod 86 extend and press against the surface of the plate at the opening of the workpiece, completing the multi-point pressing and fixing of the workpiece. Then, according to the welding operation requirements, the rotation adjustment cylinder 113 is controlled to extend and retract, driving the sliding slide 11 to slide and the support frame 111 to rotate, adjusting the overall tilt angle of the carrier 3 to a suitable working tilt angle; then the rotating disk 21 is driven to rotate, driving the carrier 3 to circumferentially deflect to the target welding position, and the positioning drive cylinder 23 is controlled to extend so that the positioning rod 24 is inserted into the positioning hole 211 to complete the circumferential locking.

[0041] Next, the workpiece assembly adjustment is carried out. First, the rotating gear 101 is controlled to rotate counterclockwise, so that the split coupling 93 is kept in the meshing state and the second bevel gear 94 and the first bevel gear 911 are kept in the disengaged state. After the first transmission rod 91 is connected to external power, the power is transmitted to the second transmission rod 92 through the split coupling 93. The first lead screw moving mechanism 41 is driven to run through the cooperation of the worm 921 and the worm wheel 411. With the synchronous transmission of the first transmission belt 44, the two-sided assembly adjustment components 5 are driven to move synchronously along the inclined surface of the carrier 3, and the assembly distance of the two-sided workpieces is adjusted to the preset position. After the spacing is adjusted to the correct position, the control gear 101 rotates clockwise, causing the split coupling 93 to separate and the second bevel gear 94 to mesh with the first bevel gear 911. At this time, the power of the first transmission rod 91 is transmitted to the limit rod 33 through the bevel gear pair, which drives the transmission roller 331 to rotate. Then, the second transmission belt 62 drives the rotating wheel 56 to rotate, causing the second lead screw moving mechanism 52 to run, pushing the rotating plate 54 to flip upward, causing the workpieces on both sides to gradually approach each other, and finally completing the precise splicing and docking in the manner of upper and lower interlocking.

[0042] After the workpiece is assembled and positioned, welding can begin. During welding, the tilt angle and circumferential orientation can be adjusted again according to the weld position to adapt to the processing requirements of different welds. After welding is completed, the pressure cylinder 71 and the pressure drive cylinder 88 are controlled to retract, releasing the clamping and fixing of the workpiece. Then, the assembly adjustment component 5 and the assembly moving component 4 are adjusted in the opposite direction to reset, and the welded workpiece can be removed, completing a single welding positioning operation cycle.

[0043] In the above process: 1. The present invention is equipped with an adjustable tilt support structure. Through the movable slide 11, the support frame 111, the rotating adjustment cylinder 113 and the linkage structure, the tilt angle of the carrier 3 can be continuously adjusted steplessly. It can adapt to the welding operation requirements of different weld angles of the engine hood, and has strong adaptability. At the same time, with the auxiliary support of the stabilizer 112, the adjustment process is stable and reliable, the overall structure has good rigidity, and effectively ensures the stability of the welding operation.

[0044] 2. The present invention is provided with a rotary positioning mechanism 2, which relies on the rotating disk 21, the positioning hole 211, the positioning drive cylinder 23 and the positioning rod 24 to achieve circumferential angle adjustment and mechanical locking. It can perform multi-directional angle positioning of the workpiece, meet the welding requirements of multi-sided and irregular welds, effectively avoid workpiece displacement caused by welding vibration, significantly improve welding positioning accuracy and product forming consistency, and reduce welding misalignment defect rate.

[0045] 3. The present invention uses a synchronous splicing moving component 4 and a flip-up splicing adjustment component 5 to cooperate. The transmission wheel 43 and the first transmission belt 44 realize the synchronous operation of the double-sided screw mechanism, ensuring that the spacing adjustment of the workpieces on both sides is synchronous and without deviation. At the same time, the linkage structure of the screw, rotating rod 521 and extension plate 55 is used to realize the upper and lower interlocking splicing and docking of the workpieces, effectively improving the problems of large gaps and poor misalignment accuracy of traditional docking, and greatly improving the splicing and fitting accuracy of the engine hood and the overall welding quality.

[0046] 4. This invention features a linkage-type power switching mechanism 10 and a separate coupling 93. Through a single set of rotating gears 101 and a double rack structure, the power transmission path can be switched synchronously and precisely, enabling flexible switching between workpiece translation adjustment and flipping / assembly conditions without the need for multiple independent drives. Combined with a spline telescopic and wedge-shaped meshing coupling structure, the transmission is backlash-free, the clutch response is fast, the overall machine structure is simplified, manufacturing costs and failure rates are reduced, and the equipment's operational stability is improved.

[0047] 5. The present invention adds an extended pressing mechanism 8 to adapt to irregular workpieces. By using the inclined pressing rod 86, the telescopic spring 87 and the cylinder linkage structure, it can achieve multi-point adaptive pressing on the outer edge of the engine hood and the opening position. The pressing is uniform and can adapt to the thickness of the plate, effectively suppressing welding warping deformation and workpiece loosening, avoiding rigid pressure damage to the workpiece, and greatly improving the welding flatness and product yield.

[0048] 6. The present invention adopts a limit rod 33 with spline sliding and follow-up transmission structure, so that the splicing adjustment component 5 can still receive power stably during the translation process, realizing that the translation adjustment and angle splicing actions are independent and controllable and do not interfere with each other. The equipment has high integration, small space occupation, and is suitable for various work positions and conditions, with strong versatility.

[0049] 7. This invention has a high degree of integration and automation. It can complete the entire process of engine hood posture adjustment, spacing adjustment, fitting and splicing, multi-point pressing and precise positioning in one go. It replaces the tedious operation of traditional manual alignment and manual pressing, effectively shortens the clamping and positioning time, improves welding processing efficiency, reduces manual labor intensity, is suitable for mass production line production, and has high industrial promotion value.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An engine hood welding positioning device, comprising a base, characterized in that, The base contains a movable slide, and above the movable slide is a rotatable and adjustable support. A stabilizing rod is located on the other side of the support, with its other end connected to the base. A rotary adjustment cylinder is located within the movable slide. A first connecting rod is located on the inner side of the support, connected to the rotary adjustment cylinder. A second connecting rod, connected to the movable slide, is located at the end of the first connecting rod. A rotary adjustment mechanism is located on the support. The output end of the rotary adjustment mechanism is a carrying frame designed in an isosceles triangular shape. A base plate is located within the carrying frame. A splicing and moving assembly is located above the carrying frame. A splicing and adjusting assembly is located at the output end of the splicing and adjusting assembly. A carrier plate is located at the output end of the splicing and adjusting assembly. A pressing cylinder is located on the outer side of the carrier plate. An extending pressing mechanism is located above one side of the carrier plate. A linkage drive mechanism is located at the geometric center of the carrying frame.

2. The engine hood welding positioning device according to claim 1, characterized in that, The rotation adjustment mechanism includes a rotating disk mounted on a support frame. A mounting plate is provided on the outer side of the rotating disk. A positioning hole is provided inside the rotating disk. A positioning drive cylinder is provided on the inner side of the support frame. A positioning rod is provided at the output end of the positioning drive cylinder and is inserted into and corresponds to the positioning hole.

3. The engine hood welding positioning device according to claim 2, characterized in that, The splicing and moving assembly includes a first lead screw moving mechanism, a slide block is provided above the first lead screw moving mechanism and is connected to the splicing and adjusting assembly, a transmission wheel is provided on the outer side of the first lead screw moving mechanism, and a first transmission belt is provided between the two transmission wheels on the same side.

4. The engine hood welding positioning device according to claim 3, characterized in that, The assembly adjustment component includes a movable seat connected to a slide, a second lead screw moving mechanism is provided inside the movable seat, an ear seat is provided on the outer side of the movable seat, a rotating plate is provided on the ear seat, an extension plate is provided on the inner side of the rotating plate, a rotating rod is provided on the outer side of the moving end of the second lead screw moving mechanism, and the other end of the rotating rod is rotatably connected to the extension plate, and a rotating wheel is provided on the outer side of the second lead screw moving mechanism.

5. The engine hood welding positioning device according to claim 4, characterized in that, A connecting frame is provided between the two splicing and adjusting components on the same side. Support plates are provided on both sides of the base plate. A rotatable limiting rod is provided between the two support plates. A transmission roller is provided on the limiting rod. Limiting rollers are provided on the connecting frame located on both sides of the transmission roller. A second transmission belt is provided on the rotating wheel, the limiting roller, the transmission roller, and the limiting roller.

6. The engine hood welding positioning device according to claim 5, characterized in that, The linkage drive mechanism includes a first transmission rod and a second transmission rod located on the outside of the splicing moving assembly. A worm gear for receiving driving power is provided on the outside of the second lead screw moving mechanism. A worm gear meshing with the worm gear is provided on the second transmission rod. A first bevel gear is provided at the end of the first transmission rod. A split coupling is provided at the end of the second transmission rod and connected to the first transmission rod. An extension rod is provided on the outside of the limiting rod. A movable and adjustable second bevel gear is provided on the extension rod. A movable sleeve with an I-shaped cross-section is provided on one side of the second bevel gear. A power switching mechanism is provided on the base plate for switching the meshing of the first bevel gear and the second gear and the separation of the split coupling.

7. The engine hood welding positioning device according to claim 6, characterized in that, The separating coupling includes a first coupling disc disposed at the end of the first transmission rod, a telescopic rod with splines disposed inside the end of the second transmission rod, an adjusting sleeve with an I-shaped cross-section disposed on the outside of the telescopic rod, a second coupling disc disposed on one side of the adjusting sleeve, and wedge-shaped end faces provided on the end faces of the first coupling disc and the second coupling disc to achieve meshing.

8. The engine hood welding positioning device according to claim 7, characterized in that, The power switching mechanism includes a rotating gear mounted on a base plate. A first adjusting rack is mounted on the base plate below the limiting rod. A first connecting sleeve is mounted on the first adjusting rack and engages with a movable sleeve. A second adjusting rack is mounted above the first adjusting rack. The first and second adjusting racks are arranged at right angles and both mesh with the rotating gear. A second connecting sleeve is mounted above the second adjusting rack and engages with the adjusting sleeve. A limiting cover is also mounted on the base plate and is slidably connected to the second adjusting rack.

9. The engine hood welding positioning device according to claim 8, characterized in that, The extended pressing mechanism includes an L-shaped extension frame mounted on a rotating plate. The extension frame has housings on both sides, and a lifting rod is installed inside the housing. A top plate is installed above the lifting rod, and a base plate is installed below the top plate. A pressure rod arranged in an inclined manner is installed below the top plate and slides relative to the base plate. A telescopic spring is sleeved on the outside of the lifting rod located below the base plate.

10. The engine hood welding positioning device according to claim 9, characterized in that, The extension frame is equipped with a pressure drive cylinder, and a linkage plate is provided below the lifting rod and connected to the output end of the pressure drive cylinder.

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