Quick die changing welding tool and welding method thereof

Abstract

The invention discloses a quick die changing welding tool and a welding method thereof. The quick die changing welding tool comprises an L-shaped support, a controller fixedly installed on the L-shaped support, a three-axis driving mechanism fixedly installed on the vertical end face of the L-shaped support and a welding head installed on the three-axis driving mechanism. Clamping chain conveying mechanisms are symmetrically arranged on the L-shaped support, and a welding clamping mechanism and a tensioning conveying mechanism are further arranged on the L-shaped support. The welding clamping mechanism comprises a clamping assembly and a centering and positioning assembly. The tensioning conveying mechanism comprises a driving assembly, a rotating disc driven by the driving assembly to rotate, round rods evenly installed on the rotating disc, and a quick release assembly arranged between the round rods and the rotating disc. The problems that when an existing welding device works, the chain ring posture of a long chain ring strip deviates, and the positioning accuracy is low can be solved.

Description

Technical Field

[0001] This invention belongs to the field of welding machine technology, specifically referring to a quick mold-changing welding fixture and its welding method. Background Technology

[0002] In the field of welding long chain links with alternating vertical and horizontal spatial configurations, the existing welding equipment has significant defects in its transmission and positioning structure, making it difficult to meet the requirements of automated and high-accuracy welding. Specifically, existing chain link welding equipment typically relies solely on chain clamping mechanisms at both ends to achieve chain link transmission. This involves inserting a chain clamping blade at the output chain link end into the chain link to clamp and pull it, thereby completing the intermittent transmission and welding of the chain links.

[0003] However, such devices generally lack a dedicated chain link tensioning and conveying mechanism, making it impossible to apply stable end tension force to the chain links at both ends during welding. This causes the chain links to easily shift their posture during welding due to issues such as link gaps and unilateral force, severely affecting welding accuracy and weld quality. At the same time, existing chain conveying mechanisms are mostly unilaterally driven, and the chain links are prone to shaking and positioning deviations during conveying, further reducing the repeatability and accuracy of the welding station. In addition, existing devices have poor adaptability, requiring complex disassembly and adjustment for different specifications of chain links, resulting in low mold change efficiency and difficulty in meeting the mass production needs of multiple chain link varieties. Summary of the Invention

[0004] To address the aforementioned problems of chain link attitude deviation, low positioning accuracy, and poor mold changing efficiency, this invention provides a rapid mold changing welding fixture and its welding method.

[0005] To achieve the above functions, the technical solution adopted by the present invention is as follows: a quick mold changing welding fixture for automatically conveying, coordinating tensioning, posture correction and continuous welding of long chain links with alternating vertical and horizontal spatial configurations, including an L-shaped support, a controller fixedly installed on the L-shaped support, a three-axis drive mechanism fixedly installed on the vertical end face of the L-shaped support and a welding head installed on the three-axis drive mechanism; The L-shaped support is symmetrically equipped with a chain conveying mechanism, as well as a welding clamping mechanism and a tensioning conveying mechanism. The welding clamping mechanism includes a clamping assembly and a centering and adjusting assembly; The tensioning and conveying mechanism includes a drive assembly, a turntable driven to rotate by the drive assembly, round rods evenly installed on the turntable, and a quick-release assembly disposed between the round rods and the turntable. The round rod is used to extend into the chain link.

[0006] Furthermore, the tensioning and conveying mechanism comprises at least four sets, symmetrically arranged in pairs on both sides of the welding head; Of the two sets of tensioning and conveying mechanisms on the same side, one set is installed on the horizontal end face of the L-shaped support, and the other set is installed on the vertical end face of the L-shaped support. The two sets are staggered. The tensioning and conveying mechanism on the horizontal end face of the L-shaped support has a round rod that is sequentially inserted into the vertically positioned spaced chain links. The tensioning and conveying mechanism on the vertical end face of the L-shaped support has a round rod that is sequentially inserted into the horizontal chain link connected to the vertical chain link.

[0007] Furthermore, the quick-release assembly includes mounting slots evenly spaced on the turntable, a mounting block fixed to the end of the round rod and adapted to be inserted into the mounting slot, threaded openings evenly spaced through both sides of the mounting slot, through holes corresponding to the threaded openings on both sides of the mounting block, and mounting bolts sequentially threaded into the threaded openings and through holes. Both the mounting slot and the mounting block are T-shaped structures.

[0008] Furthermore, an elastic sleeve is fixedly sleeved at the end of the round rod; During operation, the elastic sleeve end of the round rod is inserted into the chain link.

[0009] Furthermore, the drive assembly includes a vertical plate, a fixed support plate fixed to one side of the vertical plate, an adjusting cylinder fixed to the side of the vertical plate, a slider fixed to the piston rod of the adjusting cylinder, an L-shaped plate fixed to the side of the slider, a reducer fixed to the slider, and an AC servo motor fixed to the L-shaped plate. The output shaft of the AC servo motor is fixedly connected to the input end of the reducer, and the output end of the reducer is fixedly connected to the central axis of the turntable. A limiting groove is provided on the fixed support plate, and the bottom of the slider is slidably installed in the limiting groove; The vertical plate and the fixed support plate installed on the horizontal end face of the L-shaped support are both fixedly connected to the horizontal end face of the L-shaped support. The vertical plate and the fixed support plate installed on the vertical end face of the L-shaped support are both fixedly connected to the vertical end face of the L-shaped support.

[0010] Furthermore, the clamping assembly includes a first clamping cylinder group arranged horizontally, a second clamping cylinder group arranged horizontally symmetrically with respect to the first clamping cylinder group, a horizontal support plate fixed to the piston rods of the first clamping cylinder group and the second clamping cylinder group respectively, and a symmetrically arranged locking block fixed to the side of the horizontal support plate. The cross support plate is uniformly threaded with mold changing bolts, and the clamping block is provided with corresponding threaded holes, and the end of the mold changing bolt is screwed into the threaded hole; A vertical plate is fixed to the horizontal end face of the L-shaped support, and the end of the first clamping cylinder assembly is detachably fixed to the vertical plate by multiple sets of bolts. The end of the second clamping cylinder assembly is detachably fixed to the vertical end face of the L-shaped support by multiple sets of bolts; The chain link to be welded is placed between the clamp blocks.

[0011] Furthermore, the card block has a V-shaped structure, and the two sets of card blocks located on the horizontal support plate have opposite angles.

[0012] Furthermore, the centering and adjusting assembly includes a vertical connecting plate fixed to the horizontal end face of the L-shaped support, a first telescopic cylinder assembly fixed to the top of the connecting plate, a first connecting plate fixed to the top piston rod of the first telescopic cylinder assembly, a bottom bend block fixed to the first connecting plate, a horizontal plate fixed to the vertical end face of the L-shaped support, a second telescopic cylinder assembly fixed to the bottom of the horizontal plate, a second connecting plate fixed to the bottom piston rod of the second telescopic cylinder assembly, and a top bend block fixed to the bottom of the second connecting plate. Both the bottom and top curved blocks have curvature and are located between the locking blocks.

[0013] Furthermore, the chain conveying mechanism includes a triangular support plate fixed to the horizontal end face of the L-shaped support, a folded plate fixed to the top of the triangular support plate, a first conveying cylinder group fixed to the side of the folded plate, a first support plate fixed to the piston rod of the first conveying cylinder group, a second conveying cylinder group fixed to the side of the first support plate, a second support plate fixed to the piston rod of the second conveying cylinder group, and a carding knife fixed to the side of the second support plate. The cutting tool is engaged within the chain link of the chain link; One end of the broken line plate is perpendicular to the horizontal end face of the L-shaped support, and the axis of the other end is perpendicular to the inclined surface of the triangular support plate. The first transmission cylinder group is fixed to the other end of the broken line plate and is parallel to the inclined surface of the triangular support plate. A rectangular groove is provided on the inclined surface of the triangular support plate; The triangular support plate has a through-hole corresponding to the rectangular groove on its side. The controller is electrically connected to the three-axis drive mechanism, welding head, AC servo motor, adjusting cylinder, first clamping cylinder group, second clamping cylinder group, first telescopic cylinder group, second telescopic cylinder group, first conveying cylinder group, and second conveying cylinder group.

[0014] A welding method based on a quick mold-changing welding fixture includes the following steps: S1. Mold Change Adaptation and Adjustment: According to the specifications of the chain link to be welded, replace the round rod and the clamping block, call the corresponding parameters in the controller, and adjust the position of the drive mechanism; S2. Chain link feeding and stepping conveyor: The chain link is inserted into the chain conveyor mechanism and pre-positioned by gravity. The chain conveyors on both sides move forward in coordination to send the chain link to the welding station. At the same time, the round rod of the tension conveyor mechanism is inserted into the chain links that are spaced alternately. S3. Chain link tensioning and clamping positioning: After the chain link to be welded is in place, the AC servo motors of the tensioning and transmission mechanisms on both sides rotate slightly in the opposite direction to generate a synergistic tension, eliminating the gap. Then the clamping component moves to firmly clamp the chain link. S4. Chain link centering and adjustment: For horizontal chain links, activate the centering and adjustment component to flip them to a certain angle, and then fix them in place by the clamping component; S5. Welding operation: The three-axis drive mechanism drives the welding head to the welding point to carry out welding; S6. Reset and conveying: After welding is completed, the clamping components are released; the chain conveying mechanism and the tensioning conveying mechanism work together again to send out the welded chain link and send in the next chain link to be welded, repeating steps S3-S6.

[0015] Compared with the prior art, the present invention achieves the following beneficial effects by adopting the above structure: 1. The tensioning and conveying mechanism enables coordinated tensioning and reliable conveying of chain links in different postures: The mechanism adopts a four-group symmetrical and horizontal / vertical staggered layout, allowing the round rod to accurately correspond to the alternating vertical / horizontal chain links, forming a bidirectional tension force balance system to avoid unilateral force deviation of the chain links; with the accurate drive of the AC servo motor and reducer, controllable tension is applied by controlling the rotation phase difference of the turntable, effectively eliminating chain link gaps and ensuring stable welding posture; at the same time, the elastic sleeve design at the end of the round rod can increase friction to prevent relative slippage and avoid metal-to-metal contact scratching of the chain links, improving the surface quality of the workpiece; the adjustable cylinder-driven slider sliding structure can adapt to the tensioning requirements of chain links of different lengths, further improving the versatility of the mechanism.

[0016] 2. The chain conveyor mechanism enables accurate step-by-step conveying and stable pre-positioning of the chain links: The mechanism forms a conveying channel using the inclined rectangular groove of the triangular support plate. Simultaneously, through the coordinated drive of the first and second conveying cylinder groups, the chuck completes accurate cyclic actions of locking, pushing, and retracting, ensuring quantitative conveying of the chain links in a single operation. This guarantees the repeatability and positioning accuracy of the chain links to be welded at the welding station, laying the foundation for subsequent welding quality. Furthermore, the symmetrical arrangement of the two sets of mechanisms, working in sync, further enhances the stability of the long chain link conveying.

[0017] 3. The quick mold change requirement is achieved through the combination of mold change bolts and quick-release components: the mold change bolts can quickly install and remove V-shaped clips that are compatible with chain links of different outer diameters. The quick-release components, through the structure of T-shaped plug-in and double-sided bolt locking, can quickly replace the round rods that are compatible with chain links of different inner diameters. With the controller's preset parameters and the adjustment of the cylinder position for fine-tuning, full-dimensional mold change adaptation can be completed without complicated tools, greatly shortening the mold change time and improving the processing adaptability of chain links of various specifications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the quick mold changing welding fixture proposed in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the quick mold changing welding fixture proposed in this invention. Figure 2 ; Figure 3 A cross-sectional view of the quick mold change welding fixture proposed in this invention. Figure 1 ; Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 This is a schematic diagram of the structure of the card block and threaded hole proposed in this invention; Figure 6 A cross-sectional view of the quick mold change welding fixture proposed in this invention. Figure 2 ; Figure 7 for Figure 6 Enlarged view of a section at point B in the middle; Figure 8 A schematic diagram of the structure of the round rod, elastic sleeve, mounting block, mounting bolt, and through hole; Figure 9 This is a schematic flowchart of the welding method for the quick mold changing welding fixture proposed in this invention.

[0019] The components include: 1. L-shaped support; 11. Controller; 12. Three-axis drive mechanism; 13. Vertical plate; 14. Welding head; 15. Chain conveyor mechanism; 151. Triangular support plate; 1511. Rectangular groove; 1512. Through opening; 152. Folded plate; 153. First conveying cylinder group; 154. First support plate; 155. Second conveying cylinder group; 156. Second support plate; 157. Clamping knife; 16. Welding clamping mechanism; 161. Clamping assembly; 1611. First clamping cylinder group; 1612. Second clamping cylinder group; 1613. Horizontal support plate; 1614. Clamping block; 1615. Threaded hole; 1616. Mold changing bolt; 162. Centering and adjusting assembly; 1621. Connecting plate; 1622. First telescopic cylinder assembly, 1623, first connecting plate, 1624, bottom bend block, 1625, horizontal plate, 1626, second telescopic cylinder assembly, 1627, second connecting plate, 1628, top bend block, 17, tensioning transmission mechanism, 171, drive assembly, 1711, vertical plate, 1712, fixed support plate, 1713, limit groove, 1714, adjusting cylinder, 1715, slider, 1716, L-shaped plate, 1717, reducer, 1718, AC servo motor, 172, turntable, 173, round rod, 174, quick release assembly, 1741, mounting slot, 1742, mounting block, 1743, threaded opening, 1744, through hole, 1745, mounting bolt, 1746, elastic sleeve. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. The invention will be further described in detail below with reference to the accompanying drawings.

[0023] like Figure 1-8 As shown, the present invention provides a rapid mold-changing welding fixture for automating the conveying, coordinated tensioning, attitude correction, and continuous welding of long chain links with alternating vertical and horizontal spatial configurations. It includes an L-shaped support 1, a controller 11 fixedly mounted on the L-shaped support 1, a three-axis drive mechanism 12 fixedly mounted on the vertical end face of the L-shaped support 1, and a welding head 14 mounted on the three-axis drive mechanism 12. The controller 11 serves as the core control unit, controlling the coordinated actions of each component. Chain conveyors are symmetrically arranged on the L-shaped support 1. Mechanism 15 is also equipped with a welding clamping mechanism 16 and a tensioning and conveying mechanism 17; the welding clamping mechanism 16 includes a clamping component 161 and a centering and adjusting component 162, wherein: the clamping component 161 is used to clamp and position the vertical chain link; the centering and adjusting component 162 is used to deflect the horizontal chain link at a certain angle to cooperate with the clamping component 161 to adapt to the welding posture; the three-axis drive mechanism 12 drives the welding head 14 to move accurately along the X / Y / Z axes, so that the welding head 14 is positioned at the welding point of the chain link to be welded fixed by the clamping component 161; The tensioning transmission mechanism 17 includes a drive assembly 171, a turntable 172 driven to rotate by the drive assembly 171, round rods 173 evenly installed on the turntable 172, and a quick-release assembly 174 disposed between the round rods 173 and the turntable 172. The round rods 173 are used to extend into the chain link. The drive assembly 171 drives the turntable 172 to rotate, changing the spatial orientation of the round rods 173, thereby adjusting the transmission state and tension of the chain link.

[0024] like Figure 1-3As shown in Figures 6 and 7, there are at least four sets of tensioning conveying mechanisms 17, symmetrically arranged in pairs on both sides of the welding head 14. The four sets of symmetrically arranged mechanisms form a bidirectional tension force balance system, which can avoid the posture deviation caused by the chain links being subjected to force on one side, and at the same time provide synchronous tensioning for the chain links on both sides of the welding head 14, ensuring the stability of continuous welding. Of the two sets of tensioning conveying mechanisms 17 on the same side, one set is installed on the horizontal end face of the L-shaped support 1, and the other set is installed on the vertical end face of the L-shaped support 1. The two are staggered, and the staggered arrangement in the horizontal and vertical directions allows the round rod 173 to act on the [other components] respectively. The spatially distributed vertical and horizontal chain links enable synchronous tensioning of chain links in different postures. The tensioning transmission mechanism 17 on the horizontal end face of the L-shaped support 1 has its round rod 173 inserted sequentially into the vertically spaced chain links. The tensioning transmission mechanism 17 on the vertical end face of the L-shaped support 1 has its round rod 173 inserted sequentially into the horizontal chain links that are spaced apart from the vertical chain links. By inserting the rods at intervals, the tension force is evenly distributed on the chain links, avoiding excessive stress at a single point that could cause chain link deformation. At the same time, it enables segmented synchronous tensioning of continuous chain links, ensuring the straightness of the entire chain link.

[0025] like Figure 1-3 As shown in Figures 6 and 7, the quick-release assembly 174 includes mounting slots 1741 evenly spaced on the turntable 172, a mounting block 1742 fixed to the end of the round rod 173 and adapted to be inserted into the mounting slots 1741, threaded openings 1743 evenly spaced through both sides of the mounting slots 1741, through holes 1744 corresponding to the threaded openings 1743 on both sides of the mounting block 1742, and mounting bolts 1745 sequentially threaded into the threaded openings 1743 and through holes 1744. A T-type insertion joint is used to achieve quick positioning of the round rod 173, and axial fixation is achieved by symmetrical bolt tightening on both sides. This ensures connection rigidity and simplifies the disassembly and assembly process, eliminating the need for repeated... The replacement of the round rod 173 can be completed with miscellaneous tools; both the mounting slot 1741 and the mounting block 1742 are T-shaped structures, forming an anti-detachment plug-in fit; the symmetrical locking of the bolts on both sides achieves a firm and secure connection between the round rod 173 and the turntable 172, ensuring the stability of power transmission; the end of the round rod 173 is fixedly fitted with an elastic sleeve 1746, which can be made of rubber or the like; the end of the elastic sleeve 1746 of the round rod 173 is inserted into the chain link, and the elastic sleeve 1746 utilizes the elastic deformation characteristics to increase the friction with the inner wall of the chain link, preventing relative slippage between the round rod 173 and the chain link during tensioning and conveying, while also avoiding scratches on the surface of the chain link caused by metal contact; The tensioning transmission mechanism 17 generates tension force through its spatial orientation and coordinated motion. Specifically, the round rods 173 on the two symmetrically arranged turntables 172, after being inserted into the spatially distributed chain links, are synchronously and accurately rotated by their respective AC servo motors 1718. This action is not a rotation in a single direction, but rather, by controlling the rotational phase difference between the two turntables 172, the round rods 173 generate a continuous and controllable radial component force and tangential traction force on the inner wall of the chain links. This resultant force forces the chain links to undergo slight deformation in space, eliminating the gaps between the chain links, thereby achieving the tension state required for welding. The magnitude of the tension force can be accurately controlled by the controller 11 by adjusting the torque and rotation angle of the AC servo motors 1718.

[0026] like Figure 1-3 As shown in Figure 6, the drive assembly 171 includes a vertical plate 1711, a fixed support plate 1712 fixed to one side of the vertical plate 1711, an adjusting cylinder 1714 fixed to the side of the vertical plate 1711, a slider 1715 fixed to the piston rod of the adjusting cylinder 1714, an L-shaped plate 1716 fixed to the side of the slider 1715, a reducer 1717 fixed to the top of the slider 1715, and an AC servo motor 1718 fixed to the L-shaped plate 1716. The vertical plate 1711 and the fixed support plate 1712 form a stable mounting frame. The adjusting cylinder 1714 drives the slider 1715 to slide along the limiting groove 1713, realizing the overall displacement of the drive assembly 171 and adapting to the tensioning requirements of chain links of different lengths. The servo motor 1718, in conjunction with the reducer 1717, achieves speed reduction and torque increase, as well as high-accuracy speed control, providing stable power for the rotation of the turntable 172. The output shaft of the AC servo motor 1718 is fixedly connected to the input end of the reducer 1717, and the output end of the reducer 1717 is fixedly connected to the central axis of the turntable 172. The reducer 1717 converts the high-speed, low-torque output of the servo motor into low-speed, high-torque output, meeting the power requirements for the rotation of the turntable 172. At the same time, the rigid connection ensures the seamless power transmission and improves the accuracy of rotation angle control. A limit groove 1713 is provided on the fixed support plate 1712, and the bottom of the slider 1715 is slidably installed in the limit groove 1713 to achieve stable sliding of the drive assembly 171. The vertical plate 1711 and the fixed support plate 1712 installed on the horizontal end face of the L-shaped support 1 are both fixedly connected to the horizontal end face of the L-shaped support 1; the vertical plate 1711 and the fixed support plate 1712 installed on the vertical end face of the L-shaped support 1 are both fixedly connected to the vertical end face of the L-shaped support 1; the rigid fixation ensures the installation accuracy of the drive assembly 171, avoids positional deviation caused by vibration during operation, and at the same time maintains the preset spatial angle relationship between the drive assembly 171 in the horizontal and vertical directions, ensuring the coordinated tensioning effect.

[0027] like Figure 1-5As shown, the clamping assembly 161 includes a horizontally arranged first clamping cylinder group 1611, a second clamping cylinder group 1612 symmetrically arranged horizontally with respect to the first clamping cylinder group 1611, a transverse support plate 1613 respectively fixed to the piston rods of the first clamping cylinder group 1611 and the second clamping cylinder group 1612, and symmetrically arranged locking blocks 1614 fixed to the side of the transverse support plate 1613. When the first clamping cylinder group 1611 and the second clamping cylinder group 1612 are activated, the two sets of cylinders extend and retract synchronously in opposite directions, and the driving force is transmitted to the locking blocks 1614 through the transverse support plate 1613, driving the locking blocks 1614 to accurately clamp both sides of the vertical chain link; the transverse support plate 1613 is evenly distributed on the transverse support plate 1613. A threaded connection is provided with a mold-changing bolt 1616, and a corresponding threaded hole 1615 is provided on the clamping block 1614. The end of the mold-changing bolt 1616 is screwed into the threaded hole 1615, realizing the quick disassembly and replacement of the clamping block 1614, adapting to the clamping requirements of chain links with different outer diameters, and improving mold-changing efficiency. A vertical plate 13 is vertically fixed on the horizontal end face of the L-shaped support 1. The end of the first clamping cylinder group 1611 is detachably fixed to the vertical plate 13 by multiple sets of bolts. The vertical plate 13 provides a vertical installation reference for the first clamping cylinder group 1611. The end of the second clamping cylinder group 1612 is detachably fixed to the vertical end face of the L-shaped support 1 by multiple sets of bolts. The chain link to be welded is placed between the clamping blocks 1614. The clamping block 1614 has a V-shaped structure. The two sets of clamping blocks 1614 on the horizontal support plate 1613 have opposite angles. When the clamping assembly 161 is activated, the four sets of clamping blocks 1614 arranged opposite to each other stably clamp the vertical chain link from both sides, effectively preventing displacement or deformation during the welding process.

[0028] like Figure 1-4 As shown, the centering and adjusting assembly 162 includes a vertical connecting plate 1621 fixed to the horizontal end face of the L-shaped support 1, a first telescopic cylinder assembly 1622 fixed to the top of the connecting plate 1621, a first connecting plate 1623 fixed to the top piston rod of the first telescopic cylinder assembly 1622, a bottom bend block 1624 fixed to the first connecting plate 1623, a horizontal plate 1625 fixed to the vertical end face of the L-shaped support 1, a second telescopic cylinder assembly 1626 fixed to the bottom of the horizontal plate 1625, a second connecting plate 1627 fixed to the bottom piston rod of the second telescopic cylinder assembly 1626, and a top bend block 1628 fixed to the bottom of the second connecting plate 1627. Both the bottom bend block 1624 and the top bend block 1628 are curved and are located between the clamping blocks 1614. The curved structure design can accurately fit the outer wall contour of the chain link, increasing the contact area and avoiding damage to the chain link surface during the adjustment process. At the same time, it improves the efficiency of force transmission from the bend blocks to the chain link. During operation, the piston rods of the first telescopic cylinder group 1622 and the second telescopic cylinder group 1626 respectively drive the bottom bend block 1624 and the top bend block 1628 to abut against the two ends of the horizontal chain link. Through the upward pushing of the bottom bend block 1624 and the downward pressing of the top bend block 1628, the horizontal chain is rotated around the central axis to achieve posture adjustment. This component works in real time with the clamping block 1614 of the clamping component 161 to quickly and firmly limit the vertical chain link, ensuring that the chain link posture remains stable during subsequent welding and avoiding displacement.

[0029] like Figure 1-3 As shown in Figure 6, the chain conveying mechanism 15 includes a triangular support plate 151 fixed to the horizontal end face of the L-shaped support 1, a folded plate 152 fixed to the top of the triangular support plate 151, a first conveying cylinder group 153 fixed to the side of the folded plate 152, a first support plate 154 fixed to the piston rod of the first conveying cylinder group 153, a second conveying cylinder group 155 fixed to the side of the first support plate 154, a second support plate 156 fixed to the piston rod of the second conveying cylinder group 155, and a clamping knife 157 fixed to the side of the second support plate 156. The clamping knife 157 is clamped in the spaced chain links of the chain link, serving as the execution terminal for step-by-step gripping and pushing. Through strict control of the cylinder stroke and action sequence, the distance that the clamping knife 157 pushes the chain link each time remains constant, thereby ensuring the repeatability and positioning accuracy of the chain link conveyed to the welding station. This is the basis for realizing subsequent automated tensioning, alignment, and welding. One end of the folded plate 152 is perpendicular to the horizontal end face of the L-shaped support 1, and the axis of the other end is perpendicular to the inclined surface of the triangular support plate 151. The first transmission cylinder group 153 is fixed to the other end of the folded plate 152, and the first transmission cylinder group 153 is parallel to the inclined surface of the triangular support plate 151. A rectangular groove 1511 is formed on the inclined surface of the triangular support plate 151, which constitutes the conveying channel of the chain link. A through opening 1512 is formed on the side of the triangular support plate 151 corresponding to the rectangular groove 1511, allowing the chain link to pass through to enter or leave the processing area. The chuck 157 is fixed to the first... The two support plates 156 are located on the sides and are used to engage the intermittent chain links during operation. The first transmission cylinder group 153 drives the chuck 157 to reciprocate along the inclined surface parallel to the triangular support plate 151, and the second transmission cylinder group 155 drives the chuck 157 to move up and down along the inclined surface perpendicular to the triangular support plate 151. The coordinated action of the two sets of cylinders drives the chuck 157 to complete the cycle of "engaging, pushing / pulling, and retracting", thereby realizing intermittent, single-quantity transmission of the chain links and ensuring that each single chain link to be processed is accurately delivered to the welding station. The controller 11 is electrically connected to the three-axis drive mechanism 12, welding head 14, AC servo motor 1718, adjusting cylinder 1714, first clamping cylinder group 1611, second clamping cylinder group 1612, first telescopic cylinder group 1622, second telescopic cylinder group 1626, first transmission cylinder group 153, and second transmission cylinder group 155. It is used to receive feedback signals from each component and output control commands to realize the automated coordinated operation of each action of the tooling. At the same time, it can preset the processing parameter formulas of different chain link specifications to achieve rapid mold change and accurate control.

[0030] like Figure 9 As shown, the welding method of the quick mold change welding fixture provided by the present invention is based on the above-mentioned quick mold change welding fixture, and specifically includes the following steps: S1: Mold change and adaptation adjustment to match the specifications of the chain links to be welded. 1. Replacement of round rod 173: Remove mounting bolt 1745 via quick-release assembly 174, remove the original round rod 173, and replace it with a round rod 173 with elastic sleeve 1746 that matches the inner diameter of the chain link to be welded; align the T-shaped mounting block 1742 at the end of the round rod 173 with the T-shaped mounting slot 1741 of the turntable 172 and insert it, tighten the mounting bolt 1745 to complete the fixing of the round rod 173, ensuring the compatibility and connection rigidity of the round rod 173 with the chain link; 2. Replacement of clamping block 1614: Remove the mold changing bolt 1616 of the clamping assembly 161, remove the original clamping block 1614, and replace it with a V-shaped clamping block 1614 that matches the outer diameter of the chain link to be welded; fasten the V-shaped clamping block 1614 to the cross support plate 1613 with the mold changing bolt 1616, ensuring that the angles of the clamping block 1614 are opposite, laying the foundation for stable clamping in the future; 3. Parameter and position calibration: Call or set the processing parameters of the corresponding chain link specifications in the controller 11; start the adjustment cylinder 1714 of the drive component 171, drive the slider 1715 to slide along the limit groove 1713, so that the turntable 172 and the round rod 173 are moved to the preset position that matches the chain link length, and complete the full-dimensional mold change adaptation.

[0031] S2: Chain link loading and conveying, transporting to the processing station; 1. Manual feeding: The long chain links are sequentially threaded into two sets of symmetrically arranged chain conveying mechanisms 15, so that the chain links at the inlet and outlet ends are attached to the rectangular groove 1511 of the triangular support plate 151 by gravity, thus achieving the initial pre-positioning of the chain links. 2. Synchronous step-by-step transmission: The controller 11 initiates the coordinated action of the two sets of chain conveyor mechanisms 15, the specific process of which is as follows: (1) Discharge port end mechanism: The second conveyor cylinder group 155 retracts, driving the cutter 157 to disengage from the chain link; after the first conveyor cylinder group 153 retracts and resets, the second conveyor cylinder group 155 extends, driving the cutter 157 to engage with the rear spacer chain link of the chain link; then the first conveyor cylinder group 153 extends, pushing the chain link along the lower direction of the rectangular groove 1511 through the cutter 157; (2) Feed port end mechanism: Synchronously with the action of the discharge port end, the second cylinder group 155 retracts to disengage the cutter 157 from the chain link; after the first cylinder group 153 extends and resets, the second cylinder group 155 extends to drive the cutter 157 to engage with the rear spacer chain link of the chain link; then the first cylinder group 153 retracts, and the cutter 157 pulls the chain link along the high direction of the rectangular groove 1511. 3. Initial positioning: During the conveying process, the round rods 173 of the tensioning conveyor 17 on the horizontal and vertical end faces are simultaneously inserted into the chain links that are spatially alternating, completing the initial positioning of the chain links and preparing for the subsequent tensioning process; S3: Chain link tensioning and clamping positioning to ensure welding stability S3.1 Spatial Coordination Tightening When the vertical chain link to be welded moves to the welding station, the controller 11 controls the AC servo motors 1718 on both sides to rotate slightly in the opposite direction by a preset angle. The turntable 172 drives the round rod 173 to apply a synergistic pulling force to both ends of the chain link. The force between the round rod 173 and the inner wall of the chain link is used to eliminate the gap between the chain links, so that the chain link reaches the tension state required for welding. S3.2 Accurate and stable clamping After the chain link is tensioned, the clamping assembly 161 is immediately activated: the first clamping cylinder group 1611 and the second clamping cylinder group 1612 extend and retract synchronously in opposite directions, and transmit the driving force to the V-shaped locking block 1614 through the horizontal support plate 1613; the four sets of V-shaped locking blocks 1614 clamp the vertical chain link from both sides of its circumferential ends, complete the final positioning of the chain link, and prevent displacement or deformation during the welding process; S4: Align and adjust the chain links, turning the horizontal chain links into a vertical orientation. 1. Station Conveying: After the previous vertical chain link is welded, the chain conveying mechanism 15 on both sides is started. At the same time, the controller 11 controls the AC servo motors 1718 on both sides to rotate in the same direction at a preset angle, which drives the chain link to move and convey the subsequent horizontal chain link to the welding station. 2. Attitude Reversal: Activate the centering and adjusting component 162. The first telescopic cylinder group 1622 drives the bottom bend block 1624 to rise upwards, and the second telescopic cylinder group 1626 drives the top bend block 1628 to press downwards, so that the arc-shaped bottom bend block 1624 and top bend block 1628 respectively fit against the two ends of the horizontal chain link; the two telescopic cylinder groups apply force synchronously, driving the horizontal chain to rotate around the central axis to a certain angle; 3. Immediate clamping: After the posture adjustment is completed, the clamping assembly 161 is immediately activated to stably clamp the vertical chain link; then the first telescopic cylinder group 1622 and the second telescopic cylinder group 1626 are reset, and the bottom bend block 1624 and the top bend block 1628 are disengaged from the chain link to avoid interference with the welding operation. S5: Positioning and welding of welding head 14 to complete chain link welding. Start the three-axis drive mechanism 12 to drive the welding head 14 to move accurately along the X / Y / Z axes, so that the welding head 14 is positioned at the welding point of the chain link to be welded fixed by the clamping component 161; after confirming that the positioning is correct, start the welding head 14 to perform welding operation on the welding part of the chain link. During the welding process, maintain the positioning state of the clamping component 161 and the tensioning and conveying mechanism 17 to avoid chain link displacement. S6: Post-weld reset and finished product conveying, completing a single welding cycle. 1. Component reset: After welding is completed, the welding head 14 rises, waiting to weld the next chain link; the first clamping cylinder group 1611 and the second clamping cylinder group 1612 retract in opposite directions, and the locking block 1614 releases the chain link and releases the clamping constraint. 2. Finished product conveying: The chain conveying mechanism 15 on both sides works in concert with the tensioning conveying mechanism 17 to complete the conveying of the finished product chain links and the feeding of the next set of chain links. (1) Discharge port end mechanism: The second conveying cylinder group 155 drives the chuck 157 to rise and disengage from the chain link, and the first conveying cylinder group 153 retracts and resets; then the second conveying cylinder group 155 descends, drives the chuck 157 to engage the spacer chain link near the welding head 14, and the first conveying cylinder group 153 extends to push the chain link to move in the discharge direction. (2) Feed port end mechanism: Synchronously cooperates with the discharge port end action to complete the pulling and pushing of the chain link; at the same time, the controller 11 controls the AC servo motor 1718 of the tensioning and conveying mechanism 17 to reverse the chain end servo motor and keep rotating in the same direction as the chain end servo motor, and drive the chain link to be smoothly conveyed through the round rod 173 according to the preset number of turns parameters. 3. Cyclic operation: After the conveying is completed, repeat steps S2-S6 to enter the welding cycle of the next set of chain links.

[0032] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A quick-change welding fixture for automating the conveying, coordinated tensioning, attitude correction, and continuous welding of long chain links with alternating vertical and horizontal spatial configurations, comprising an L-shaped support (1), a controller (11) fixedly mounted on the L-shaped support (1), a three-axis drive mechanism (12) fixedly mounted on the vertical end face of the L-shaped support (1), and a welding head (14) mounted on the three-axis drive mechanism (12), characterized in that: The L-shaped support (1) is symmetrically provided with a chain conveying mechanism (15), and is also equipped with a welding clamping mechanism (16) and a tensioning conveying mechanism (17). The welding clamping mechanism (16) includes a clamping assembly (161) and an alignment and adjustment assembly (162). The tensioning transmission mechanism (17) includes a drive assembly (171), a turntable (172) driven to rotate by the drive assembly (171), round rods (173) evenly installed on the turntable (172), and a quick-release assembly (174) disposed between the round rods (173) and the turntable (172).

2. The quick mold-changing welding fixture according to claim 1, characterized in that: The tensioning and conveying mechanism (17) consists of at least four sets, arranged symmetrically in pairs on both sides of the welding head (14); Of the two sets of tensioning and conveying mechanisms (17) on the same side, one set is installed on the horizontal end face of the L-shaped support (1), and the other set is installed on the vertical end face of the L-shaped support (1). The two are arranged in a staggered manner. The tensioning and conveying mechanism (17) on the horizontal end face of the L-shaped support (1) has a round rod (173) for sequentially inserting into the vertically positioned spaced chain links; The tensioning and conveying mechanism (17) on the vertical end face of the L-shaped support (1) has a round rod (173) for sequentially inserting into the horizontal chain link connected to the vertical chain link.

3. A quick mold-changing welding fixture according to any one of claims 1 or 2, characterized in that: The quick-release assembly (174) includes mounting slots (1741) evenly distributed on the turntable (172), mounting blocks (1742) fixed to the end of the round rod (173) and adapted to be inserted into the mounting slots (1741), threaded openings (1743) evenly distributed through both sides of the mounting slots (1741), through holes (1744) corresponding to the threaded openings (1743) and opened on both sides of the mounting blocks (1742), and mounting bolts (1745) sequentially threaded into the threaded openings (1743) and through holes (1744). Both the mounting slot (1741) and the mounting block (1742) are T-shaped structures.

4. The quick mold-changing welding fixture according to claim 1, characterized in that: The end of the round rod (173) is fixedly fitted with an elastic sleeve (1746). During operation, the end of the elastic sleeve (1746) of the round rod (173) is inserted into the chain link.

5. The quick mold change welding fixture according to claim 1, characterized in that: The drive assembly (171) includes a vertical plate (1711), a fixed support plate (1712) fixed to one side of the vertical plate (1711), an adjusting cylinder (1714) fixed to the side of the vertical plate (1711), a slider (1715) fixed to the piston rod of the adjusting cylinder (1714), an L-shaped plate (1716) fixed to the side of the slider (1715), a reducer (1717) fixed to the slider (1715), and an AC servo motor (1718) fixed to the L-shaped plate (1716). The output shaft of the AC servo motor (1718) is fixedly connected to the input end of the reducer (1717), and the output end of the reducer (1717) is fixedly connected to the central axis of the turntable (172). A limiting groove (1713) is provided on the fixed support plate (1712), and the bottom of the slider (1715) is slidably installed in the limiting groove (1713); The vertical plate (1711) and the fixed support plate (1712) installed on the horizontal end face of the L-shaped support (1) are both fixedly connected to the horizontal end face of the L-shaped support (1). The vertical plate (1711) and the fixed plate (1712) installed on the vertical end face of the L-shaped support (1) are both fixedly connected to the vertical end face of the L-shaped support (1).

6. The quick mold-changing welding fixture according to claim 1, characterized in that: The clamping assembly (161) includes a first clamping cylinder group (1611) arranged horizontally, a second clamping cylinder group (1612) arranged horizontally symmetrically with respect to the first clamping cylinder group (1611), a cross support plate (1613) fixed to the piston rods of the first clamping cylinder group (1611) and the second clamping cylinder group (1612) respectively, and a symmetrically arranged locking block (1614) fixed to the side of the cross support plate (1613). The cross support plate (1613) is evenly threaded with a mold changing bolt (1616), and the clamping block (1614) is correspondingly provided with a threaded hole (1615), and the end of the mold changing bolt (1616) is screwed into the threaded hole (1615). The L-shaped support (1) has a vertical plate (13) fixed on its horizontal end face, and the end of the first clamping cylinder group (1611) is detachably fixed to the vertical plate (13) by multiple sets of bolts; The end of the second clamping cylinder assembly (1612) is detachably fixed to the vertical end face of the L-shaped support (1) by multiple sets of bolts.

7. A quick mold-changing welding fixture according to claim 6, characterized in that: The card block (1614) has a V-shaped structure, and the two sets of card blocks (1614) located on the horizontal support plate (1613) have opposite angles.

8. A quick mold-changing welding fixture according to claim 6, characterized in that: The centering and adjusting assembly (162) includes a vertical connecting plate (1621) fixed to the horizontal end face of the L-shaped support (1), a first telescopic cylinder assembly (1622) fixed to the top of the connecting plate (1621), a first connecting plate (1623) fixed to the top piston rod of the first telescopic cylinder assembly (1622), a bottom bend block (1624) fixed to the first connecting plate (1623), a horizontal plate (1625) fixed to the vertical end face of the L-shaped support (1), a second telescopic cylinder assembly (1626) fixed to the bottom of the horizontal plate (1625), a second connecting plate (1627) fixed to the bottom piston rod of the second telescopic cylinder assembly (1626), and a top bend block (1628) fixed to the bottom of the second connecting plate (1627). Both the bottom bend block (1624) and the top bend block (1628) have curvature and are located between the locking blocks (1614).

9. The quick mold change welding fixture according to claim 1, characterized in that: The chain conveying mechanism (15) includes a triangular support plate (151) fixed to the horizontal end face of the L-shaped support (1), a folded plate (152) fixed to the top of the triangular support plate (151), a first conveying cylinder group (153) fixed to the side of the folded plate (152), a first support plate (154) fixed to the piston rod of the first conveying cylinder group (153), a second conveying cylinder group (155) fixed to the side of the first support plate (154), a second support plate (156) fixed to the piston rod of the second conveying cylinder group (155), and a chuck (157) fixed to the side of the second support plate (156). During operation, the cutter (157) engages with the chain link; One end of the broken line plate (152) is perpendicular to the horizontal end face of the L-shaped support (1), and the axis of the other end is perpendicular to the inclined surface of the triangular support plate (151). The first transmission cylinder group (153) is fixed to the other end of the broken line plate (152), and the first transmission cylinder group (153) is parallel to the inclined surface of the triangular support plate (151). A rectangular groove (1511) is provided on the inclined surface of the triangular support plate (151). The triangular support plate (151) has a through opening (1512) on its side corresponding to the rectangular groove (1511).

10. A welding method for a quick mold-changing welding fixture according to any one of claims 1-9, specifically comprising the following steps: S1. Mold change and adaptation adjustment: According to the specifications of the chain link to be welded, replace the round rod (173) and the locking block (1614), call the corresponding parameters in the controller (11), and adjust the position of the drive mechanism (171); S2. Chain link feeding and stepping conveyor: The chain link is inserted into the chain conveyor mechanism (15), and is pre-positioned by gravity. The two chain conveyor mechanisms (15) on both sides step forward together to send the chain link to the welding station. At the same time, the round rod (173) of the tension conveyor mechanism (17) is inserted into the chain links that are spaced alternately. S3. Chain link tensioning and clamping positioning: After the chain link to be welded is in place, the AC servo motor (1718) of the tensioning and conveying mechanism (17) on both sides rotates slightly in the opposite direction to generate a synergistic pulling force, eliminating the gap. Then the clamping component (161) moves to firmly clamp the chain link. S4. Chain link alignment and positioning: For the horizontal chain link, the centering and adjusting component (162) is activated to flip it to a certain angle and is fixedly clamped by the clamping component (161); S5. Welding operation: The three-axis drive mechanism (12) drives the welding head (14) to the welding point to carry out welding; S6. Reset and transport: After welding is completed, the clamping assembly (161) is released; the chain conveying mechanism (15) and the tensioning conveying mechanism (17) work together again to send out the welded chain link and send in the next chain link to be welded, repeating steps S3-S6.

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