Square cavity undercut forming device and forming method thereof

Abstract

The present invention relates to a square cavity biting edge forming device and a forming method thereof, wherein a cavity seat for placing a U-shaped cavity is installed on the top surface of a feeding pre-installation machine, and end cover seats for horizontally placing end covers are installed on the outside of both ends of the cavity seat; a flipping mechanism pushes the flip cover seat to flip toward the cavity seat, so that the end covers are spaced apart and located on both sides of the U-shaped cavity to complete pre-installation, and are transferred to the biting edge machine by a transfer mechanism; the biting edge machine is provided with a tightening mechanism for fixing and limiting the U-shaped cavity, and fastening mechanisms for fixing the end covers are provided on the outside of both ends of the tightening mechanism, and also includes a biting edge driving mechanism, which rivets and engages the two end edges of the U-shaped cavity and the end cover edges that are close to each other as the chain rotates, and a square cavity structure with an opening facing downward is formed after the chain is driven for one circle, thereby realizing the biting edge forming of the square cavity in an automated manner, with a fast cycle and high forming efficiency, thereby greatly improving the forming stability and consistency.

Description

Technical Field

[0001] The invention relates to the technical field of rotary riveting equipment, in particular to a square cavity bite forming device and a forming method thereof. Background Art

[0002] Some thin-walled cavities, such as the cylinder inside a washing machine and its end piece molding, usually use a rotary riveting machine to perform edge riveting and biting to achieve a fastening connection.

[0003] In the prior art, rotary riveting machines are usually of a turntable structure. The cylinder and end pieces rotate synchronously relative to the outer circumferential forming wheel to achieve edge riveting. Alternatively, the outer circumferential forming wheel rotates relative to the pre-installed cylinder and end pieces to align the edges for riveting. Existing rotary riveting machines are usually suitable for rotary riveting cylinders, and their forming method is not suitable for riveting square cavity structures.

[0004] On the other hand, the existing cylinder and its end pieces are pre-installed by manual loading before forming, and then the edge is formed by relative rotation between them and the forming wheel; the manual pre-installation method consumes manpower, is labor-intensive and time-consuming, and is not conducive to improving the overall beat. Summary of the Invention

[0005] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a square cavity biting edge forming device and a forming method with a rational structure, thereby realizing the biting edge forming of the square cavity in an automated manner, with a fast cycle and high forming efficiency, which greatly improves the forming stability and consistency.

[0006] The technical solutions adopted in the present invention are as follows:

[0007] A square cavity undercut forming device comprises an undercutting machine and a loading and pre-assembling machine arranged at intervals on the left and right, a transfer mechanism being installed on the rear ends of the undercutting machine and the loading and pre-assembling machine, and a loading and unloading clamping claw being installed on the transfer mechanism;

[0008] A cavity seat is installed in the middle of the top surface of the loading and pre-assembling machine, and end cover seats are installed at intervals on the front and rear ends of the cavity seat. The cavity seat is used to place the inverted U-shaped cavity, and the end cover seat is used to place the end cover horizontally; the end cover seat is also equipped with a flipping mechanism that drives it to flip toward the cavity seat;

[0009] The biting machine is provided with a tightening mechanism for fixing and limiting the U-shaped cavity, and fastening mechanisms for fixing the end covers are provided on the outside of both ends of the tightening mechanism. It also includes a biting drive mechanism. As the chain rotates, the biting drive mechanism rivets the two end edges of the U-shaped cavity and the end cover edges that are close to each other to form a square cavity structure.

[0010] As a further improvement of the above technical solution:

[0011] The structure of the loading and pre-assembly machine is as follows: it includes a frame, a cavity seat is installed in the middle of the top surface of the frame, and guide support seats with openings facing upwards are installed at the bottom of the left and right sides of the cavity seat; the end cover seats are respectively rotatably installed on the frames in front and behind the cavity seat through rotating shafts, and the flip mechanism is correspondingly installed in the frame below the end cover seat.

[0012] The top surface of the cavity seat is provided with a suction nozzle, which is used to suck from the top surface of the U-shaped cavity; the end cover seat is provided with a similar suction nozzle, which sucks the end cover from the outer side.

[0013] An alignment mechanism is installed on the upper front end or the upper rear end of the cavity seat, and the alignment mechanism drives the top alignment block upward, and the alignment block contacts the U-shaped cavity end through the inclined surface facing the cavity seat.

[0014] The transfer mechanism includes a horizontal transverse moving assembly in the left and right directions, and two sets of lifting assemblies that move along the transverse moving assembly are installed at intervals on the side of the transverse moving assembly, and a loading clamp and a unloading clamp are installed at the bottom of the lifting assembly respectively.

[0015] The loading clamps synchronously transfer the U-shaped cavity spaced front and back and the end covers at both ends from the loading pre-assembly machine to the biting machine.

[0016] The structure of the biting machine is as follows: it includes a machine base, a tightening mechanism is installed in the middle of the top surface of the machine base, and movable seats are symmetrically installed on the machine base located in front of and behind the tightening mechanism. The inner side surfaces of the movable seats facing each other are respectively fixed with end covers, and the two groups of movable seats move synchronously toward or away from each other; the inner side surface of the movable seat located outside the circumference of the end cover is installed with a transmission chain, and the chain is orderly installed with guide biting wheels.

[0017] The guide biting wheel is rotatably installed on the inner side of the chain link facing the end cover, and a groove is opened along the circumferential direction on the circumferential surface of the guide biting wheel. As the chain is transmitted, the width of the circumferential groove of the guide biting wheel gradually decreases; multiple guide biting wheels are concentratedly installed on one section of the chain; as the chain is transmitted, a biting drive mechanism is formed.

[0018] The tightening mechanism tightens the U-shaped cavity from the inside, and side pressure mechanisms are installed on the machine bases on the left and right sides of the tightening mechanism, which apply a clamping force to the U-shaped cavity from the outside; a pressing mechanism is also installed on the left and right and upper edges of the movable seat located outside the chain, and the movable seat moves toward the tightening mechanism under the drive of the propulsion mechanism, so that the edge of the U-shaped cavity is close to the edge of the end cover, and the pressing mechanism applies force to the outer wall of the U-shaped cavity from the outside to the inside.

[0019] A forming method of the square cavity undercut forming device comprises the following steps:

[0020] Place the U-shaped cavity with the opening facing downward on the cavity seat, and place the end cover with the opening facing upward on the end cover seat; the cavity seat and the end cover seat respectively absorb and fasten the U-shaped cavity and the end cover;

[0021] The flip mechanism works, pushing the end cover to flip along with the end cover seat toward the U-shaped cavity until the end cover is in the vertical direction. At this time, the end covers on both sides are spaced outside the two ends of the U-shaped cavity;

[0022] The transfer mechanism drives the loading clamp to move to the top of the U-shaped cavity. The loading clamp moves downward and grasps the U-shaped cavity and the end cover at the same time. The cavity seat and the end cover seat release the U-shaped cavity and the end cover respectively. The U-shaped cavity and the end cover are transferred to the biting machine by the loading clamp through the transfer mechanism.

[0023] The U-shaped cavity is placed on the tightening mechanism and tightened from the inside out, and the end cover is tightened from the outside by the tightening mechanism;

[0024] The end cover moves along with the fastening mechanism toward the tightening mechanism until the end cover contacts the edge of the U-shaped cavity;

[0025] The biting drive mechanism works, and through the transmission of the chain, the edges of the end cover and the U-shaped cavity are riveted and bitten into one piece, so that the end cover and the U-shaped cavity are fixedly connected to form a square cavity structure with one end open.

[0026] The beneficial effects of the present invention are as follows:

[0027] The present invention has a compact and reasonable structure and is easy to operate. The pre-assembly of the square cavity structure before molding is achieved by a loading pre-assembly machine. The loading clamp simultaneously transfers the pre-assembly structure in an exploded form to a biting machine. Finally, the biting drive mechanism in the biting machine performs edge biting to achieve molding of the square cavity structure. From pre-assembly to final molding, automated operation is achieved. The single-piece operation time is 18 seconds, with fast cycle time and high efficiency, greatly improving molding stability and consistency.

[0028] The present invention also includes the following advantages:

[0029] The bite edge drive mechanism is based on chain transmission to achieve non-circular path walking and biting. The design is ingenious and unique. It is not only suitable for square cavity bite edge forming, but also can be used for other non-circular forms of bite edge forming. It has high flexibility and a wide range of applications.

[0030] By orderly arranging a plurality of guide biting wheels with different circumferential groove shapes, as the chain moves, the guide biting wheels sequentially apply force to the edge of the square cavity to be formed through the grooves, and the biting is completed after the chain travels one circle; by setting or replacing the guide biting wheels, it can be suitable for square cavities with different biting requirements, and the operation is convenient and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a structural schematic diagram of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the feeding and pre-assembling machine of the present invention.

[0033] Figure 3 for Figure 2 A partial enlarged view of part A in the middle.

[0034] Figure 4 It is a structural schematic diagram of the transfer mechanism of the present invention.

[0035] Figure 5 It is a structural schematic diagram of the feeding clamp of the present invention.

[0036] Figure 6 for Figure 5 A partial enlarged view of part B in the middle.

[0037] Figure 7 It is a structural schematic diagram of the biting machine of the present invention.

[0038] Figure 8 It is a structural schematic diagram of the propulsion mechanism on the machine base of the present invention.

[0039] Figure 9 for Figure 8 A partial enlarged view of part C in the middle.

[0040] Figure 10 This is a schematic diagram of the installation of the fastening mechanism, biting edge driving mechanism, etc. in the movable seat of the present invention.

[0041] Figure 11 for Figure 10 Exploded view (another perspective).

[0042] Figure 12 It is a structural schematic diagram of the guide biting wheel of the present invention.

[0043] Figure 13 It is a structural schematic diagram of the tightening mechanism of the present invention.

[0044] Figure 14 for Figure 13 Exploded diagram.

[0045] Figure 15 This is a structural diagram of the second tightening component of the present invention.

[0046] Among them: 1. Loading pre-assembly machine; 2. Loading clamp; 3. Unloading clamp; 4. Transfer mechanism; 5. Biting machine; 6. Unloading conveyor line; 7. U-shaped cavity; 8. End cover;

[0047] 11. Frame; 12. End cover seat; 13. Cavity seat; 14. Guide support seat; 15. Rotating shaft; 16. Flipping mechanism; 17. Alignment mechanism; 18. Rotation mechanism; 181. Rotating cylinder; 182. Moving rail; 183. Rack;

[0048] 21. Gripping jaw seat; 22. Bottom supporting mechanism; 23. Edge clamping mechanism; 24. Positioning mechanism; 221. Roller; 222. Long guide hole; 223. Support block; 231. Support arm; 232. Gripping finger block; 233. Driving mechanism;

[0049] 41. Transverse movement assembly; 42. Lifting assembly;

[0050] 51. Machine base; 52. Propelling mechanism; 53. Edge pressing mechanism; 54. Tightening mechanism; 55. Moving seat; 56. Fastening mechanism; 57. Side pressing mechanism; 58. Biting drive mechanism; 59. Tensioning mechanism;

[0051] 521. Propulsion motor; 522. Screw; 523. Nut; 524. Guide mechanism;

[0052] 541. Tightening seat; 542. Tightening component one; 543. Spacing adjustment component; 544. Support component; 545. Tightening component two; 5451. Back plate; 5452. Transverse rail; 5453. Side plate; 5454. Middle plate; 5455. Tightening motor; 551. Track; 571. Side pressure cylinder; 572. Support; 573. Guide rail mechanism; 574. Pressure block; 581. Drive sprocket; 582. Drive motor; 583. Guide biting wheel; 5831. Groove. DETAILED DESCRIPTION

[0053] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0054] like Figure 1 As shown, a square cavity biting forming device of this embodiment includes a biting machine 5 and a loading and pre-assembling machine 1 arranged at intervals on the left and right. A transfer mechanism 4 is installed on the rear end of the biting machine 5 and the loading and pre-assembling machine 1. A loading clamp 2 and a unloading clamp 3 are installed on the transfer mechanism 4.

[0055] like Figure 2 As shown, a cavity seat 13 is installed in the middle of the top surface of the feeding and pre-assembling machine 1, and end cover seats 12 are installed at intervals on the front and rear ends of the cavity seat 13. The cavity seat 13 is used to place the inverted U-shaped cavity 7, and the end cover seat 12 is used to place the end cover 8 horizontally; the end cover seat 12 is also equipped with a turning mechanism 16 that drives it to turn toward the cavity seat 13;

[0056] like Figure 7As shown, the biting machine 5 is provided with a tightening mechanism 54 for fixing and limiting the U-shaped cavity 7, and fastening mechanisms 56 for fixing the end covers 8 are provided on the outside of both ends of the tightening mechanism 54. It also includes a biting drive mechanism 58. The biting drive mechanism 58 rivets and engages the edges of the two ends of the U-shaped cavity 7 and the edges of the end covers 8 that are close to each other as the chain rotates, thereby forming a square cavity structure.

[0057] The pre-assembly of the square cavity structure before molding is achieved through the loading and pre-assembly machine 1, and the pre-assembly structure in the exploded form is simultaneously transferred to the biting machine 5 by the loading clamp 2. Finally, the biting drive mechanism 58 in the biting machine 5 performs edge biting to realize the molding of the square cavity structure. From pre-assembly to final molding, automated operation is realized.

[0058] The biting drive mechanism 58 realizes walking and biting on a non-circular arc path based on chain transmission. It is ingenious and unique in design and is not only suitable for biting edge forming of square cavities, but also for biting edge forming of other non-circular arc forms. It has high flexibility and a wide range of applications.

[0059] like Figure 2 As shown, the structure of the loading and pre-assembling machine 1 is as follows: it includes a frame 11, a cavity seat 13 is installed in the middle of the top surface of the frame 11, and guide support seats 14 with openings facing upwards are installed at the bottom of the left and right sides of the cavity seat 13. The U-shaped cavity 7 is placed upside down on the cavity seat 13, and the two arm guides of the U-shaped cavity 7 are placed in the guide support seats 14; the end cover seat 12 is rotatably installed on the frame 11 in front of and behind the cavity seat 13 through the rotating shaft 15, and the flip mechanism 16 is correspondingly installed in the frame 11 below the end cover seat 12.

[0060] The inner edges of the end cover seat 12 are rotatably mounted on the frame 11 via a rotating shaft 15. The flipping mechanism 16 is a cylinder rotatably connected to the bottom surface of the end cover seat 12 and the frame 11. The cylinder applies force from bottom to top to the bottom surface of the end cover seat 12 near the outer edge, thereby pushing the end cover seat 12 to flip upward with the rotating shaft 15 as the axis.

[0061] A suction nozzle is provided on the top surface of the cavity seat 13, which is used to adsorb from the top surface of the U-shaped cavity 7; the same suction nozzle is provided on the end cover seat 12, which adsorbs the end cover 8 from the outer side. The suction nozzles are connected to the external air source, and the U-shaped cavity 7 and the end cover 8 are fixed relative to the loading and pre-installation machine 1 respectively through the adsorption of the suction nozzle.

[0062] An alignment mechanism 17 is installed on the upper front end or the upper rear end of the cavity seat 13. The alignment mechanism 17 drives the top alignment block upward. The alignment block contacts the end of the U-shaped cavity 7 through the inclined surface toward the cavity seat 13, so that the end face of the U-shaped cavity 7 is in a preset position.

[0063] like Figure 3As shown, a rotating mechanism 18 is also installed between the top surface of the frame 11 and the bottom surface of the cavity seat 13, and the rotating mechanism 18 drives the cavity seat 13 to rotate in the horizontal plane; the structure of the rotating mechanism 18 is: it includes a rotating cylinder 181 horizontally installed on the top surface of the frame 11, and a movable rail 182 is installed parallel to the outer frame 11 on the side of the rotating cylinder 181, and a rack 183 is installed on the movable rail 182. The output end of the rotating cylinder 181 is fixedly installed on the side of the rack 183, and a gear meshing with the outside of the rack 183 is installed on the bottom surface of the cavity seat 13. The rack 183 is driven to move along the length direction of the movable rail 182 by the push of the rotating cylinder 181, so that the gear meshing with the rack 183 rotates, driving the cavity seat 13 to rotate; the angle in the horizontal plane of the cavity seat 13 is adjusted by the rotating mechanism 18.

[0064] like Figure 4 As shown, the transfer mechanism 4 includes a horizontal transverse moving component 41 in the left and right directions, and two groups of lifting components 42 that move along the side of the transverse moving component 41 are installed at intervals, and the bottom ends of the lifting components 42 are respectively installed with a loading clamp 2 and a unloading clamp 3; the transverse moving component 41 drives the loading clamp 2 or the unloading clamp 3 to move in the left and right directions, so that the loading clamp 2 moves back and forth between the loading pre-installation machine 1 and the biting machine 5, and the unloading clamp 3 moves back and forth between the biting machine 5 and the unloading conveyor line 6.

[0065] The loading clamp 2 synchronously transfers the U-shaped cavity 7 and the end covers 8 at both ends with a front-to-back spacing from the loading and pre-assembling machine 1 to the biting machine 5 .

[0066] like Figure 5 As shown, the structure of the loading clamp 2 is as follows: it includes a clamping jaw base 21 installed at the bottom end of the lifting assembly 42, with an opening facing downward in a U-shaped structure. The front and rear sides of the clamping jaw base 21 are respectively installed with inwardly arranged clamping mechanisms 23 on three sides. The clamping mechanisms 23 are arranged in three directions to jointly clamp the end cover 8. The lower part of the two parallel arms of the clamping jaw base 21 is symmetrically installed with a bottom supporting mechanism 22. The bottom supporting mechanisms 22 at both ends support the U-shaped cavity 7, which is also an inverted U-shaped structure. The horizontal arms of the clamping jaw base 21 are also installed with a positioning mechanism 24. The positioning mechanism 24 ensures that the U-shaped cavity 7 supported by the bottom supporting mechanism 22 is located at a preset position of the clamping jaw base 21. The positioning mechanism 24 includes a cylinder installed on the side of the clamping jaw base 21. The output end of the cylinder faces outward and is equipped with a positioning block at the end. The positioning block is located outside the two ends of the U-shaped cavity 7. The positioning block is driven by the cylinder to move, so that the positioning block applies force to the U-shaped cavity 7 from the front and back ends.

[0067] like Figure 6As shown, the structure of the bottom supporting mechanism 22 is as follows: it includes a long guide hole 222 that runs through the lower part of the parallel arm of the clamping claw seat 21, the lower part of the long guide hole 222 extends outward, and a roller 221 that moves along its length is installed in the long guide hole 222. A support block 223 is installed at the lower middle part of the roller 221, and the support block 223 faces the inner side of the clamping claw seat 21; under the action of external driving force, the roller 221 moves along the long guide hole 222, driving the support block 223 to move up and down. When the roller 221 moves outward along the outward part of the lower part of the long guide hole 222, it drives the support block 223 to swing outward;

[0068] The structure of the edge clamping mechanism 23 is as follows: it includes a support arm 231 fixed to the side of the clamping jaw base 21, and two clamping finger blocks 232 arranged opposite to each other are rotatably mounted on the outer end of the support arm 231. The two clamping finger blocks 232 are driven by corresponding driving mechanisms 233 respectively, so that the clamping finger blocks 232 rotate relative to the support arm 231, thereby achieving gripping when the two clamping finger blocks 232 rotate toward each other or releasing when they rotate away from each other.

[0069] like Figure 7 As shown, the structure of the biting machine 5 is as follows: it includes a machine base 51, a tightening mechanism 54 is installed in the middle of the top surface of the machine base 51, and movable seats 55 are symmetrically installed on the machine base 51 in front of and behind the tightening mechanism 54. The inner side surfaces of the movable seats 55 facing each other are fixed with end covers 8 respectively, and the two groups of movable seats 55 move synchronously toward or away from each other; the inner side surface of the movable seat 55 located outside the circumference of the end cover 8 is installed with a transmission chain, and the guide biting wheels 583 are installed in an orderly manner on the chain.

[0070] like Figure 8 As shown, the movable seat 55 is moved relative to the machine base 51 through the propulsion mechanism 52; the structure of the propulsion mechanism 52 is: it includes a screw rod 522 rotatably mounted on the machine base 51 outside the end of the tightening mechanism 54, the screw rod 522 is arranged in the front-to-back direction, and the outer end of the screw rod 522 is connected to a propulsion motor 521 that drives it to rotate, and a nut 523 with a spiral pair is mounted on the screw rod 522, and the nut 523 is fixed to the middle part of the bottom surface of the corresponding movable seat 55; a guide mechanism 524 is also installed between the two sides of the bottom surface of the movable seat 55 and the machine base 51, and the guide mechanism 524 is parallel to the length direction of the screw rod 522.

[0071] like Figure 10 and Figure 11 As shown, a driving sprocket 581 is installed on the inner side of the movable base 55 located below the end cover 8, and the driving sprocket 581 is engaged with the chain for transmission; a track 551 for accommodating the chain and providing transmission for the chain is also provided on the inner side of the movable base 55. The track 551 is located above the driving sprocket 581, and the upper part of the track 551 is set as a rounded square structure that imitates the track of the square cavity bite edge. Driven by the driving motor 582, the driving sprocket 581 drives the chain to move, and the chain moves guided by the track 551.

[0072] A tensioning mechanism 59 is also installed on the inner side of the chain. The tensioning mechanism 59 is fitted to the inner side of the chain through the outer wall of the arc-shaped member. The tension of the chain is adjusted by slightly rotating the arc-shaped member toward or away from the chain.

[0073] The structure of the fastening mechanism 56 is as follows: it includes a fastening cylinder installed on the outer side of the movable seat 55, the output end of the fastening cylinder faces the movable seat 55 and a movable plate is installed at the end, a plurality of pillars are installed at intervals on the inner side of the movable plate, the pillars penetrate inwardly into the interior of the movable seat 55 and a suction nozzle is installed at the inner end, and the end cover 8 is adsorbed and fastened from the outer side through the suction nozzle.

[0074] The guide biting wheel 583 is rotatably mounted on the inner side of the chain link facing the end cover 8, as shown in FIG. Figure 12 As shown, a groove 5831 is opened along the circumferential direction on the circumferential surface of the guide biting wheel 583. As the chain is transmitted, the width of the circumferential groove 5831 of the guide biting wheel 583 gradually decreases; multiple guide biting wheels 583 are concentratedly installed on one section of the chain; as the chain is transmitted, a biting drive mechanism 58 is formed.

[0075] By orderly arranging a plurality of guide biting wheels 583 with different shapes of circumferential grooves 5831, as the chain moves, the guide biting wheels 583 apply force to the edge of the square cavity to be formed through the grooves 5831 in sequence, and the biting is completed after the chain travels one circle; by setting or replacing the guide biting wheels 583, it can be suitable for square cavities with different biting requirements, and the operation is convenient and simple.

[0076] The tightening mechanism 54 tightens the U-shaped cavity 7 from the inside, and a side pressure mechanism 57 is installed on the base 51 on the left and right sides of the tightening mechanism 54. The side pressure mechanism 57 applies a pressing force to the U-shaped cavity 7 from the outside; Figure 9 As shown, the structure of the side pressure mechanism 57 is: it includes a support 572 installed on the machine base 51, and a guide rail mechanism 573 is symmetrically installed on the top surface of the support 572. A pressure block 574 is slidably installed on the guide rail mechanism 573. The pressure block 574 is pushed by the side pressure cylinder 571 and moves toward the tightening mechanism 54 guided by the guide rail mechanism 573, thereby tightening the U-shaped cavity 7 from both sides.

[0077] like Figure 13 and Figure 14 As shown, the structure of the tightening mechanism 54 is as follows: it includes a tightening base 541 fixedly mounted on the machine base 51, and a tightening assembly 1 542 and a tightening assembly 2 545 are respectively mounted on the front and rear sides of the tightening base 541. The tightening assembly 1 542 and the tightening assembly 2 545 have the same outer support structure, and they are synchronously extended to the left and right to tighten the U-shaped cavity 7 from the inside;

[0078] A spacing adjustment component 543 is also installed on the tightening seat 541 between the tightening component 1 542 and the tightening component 2 545. Support components 544 are symmetrically installed on the left and right sides of the tightening seat 541. A guide column and guide sleeve mechanism is installed between the single support component 544 and the tightening component 2 545. The tightening component 2 545 approaches or moves away from the tightening component 1 542 under the drive of the spacing adjustment component 543, and is guided by the guide column and guide sleeve mechanism on the support component 544. Therefore, the tightening mechanism 54 is suitable for tightening different types of square cavities.

[0079] like Figure 15 As shown, the structure of the tightening component 2 545 is as follows: it includes a back plate 5451, a tightening motor 5455 with the output end facing upward is installed in the middle of the bottom end of the back plate 5451, the output end of the tightening motor 5455 is connected to the middle plate 5454 through a screw pair, the left and right sides of the middle plate 5454 are symmetrically set to be inclined to form a structure with a small top and a large bottom, and side plates 5453 are symmetrically installed on the back plates 5451 on both sides of the middle plate 5454, and the inner side surfaces of the side plates 5453 are in contact with the inclined surface of the middle plate 5454. Guide rails arranged vertically are installed between the inner side surface of 54 and the back plate 5451, and transverse rails 5452 for guiding movement are installed between the side plate 5453 and the back plate 5451; the tightening motor 5455 works to push the middle plate 5454 upward, and while the middle plate 5454 moves upward relative to the back plate 5451, it applies lateral force to the side plate 5453 through the inclined surface, so that the side plate 5453 moves laterally guided by the transverse rails 5452, and the left or right side of the side plate 5453 fits against the inner side surface of the U-shaped cavity 7 to achieve tightening.

[0080] A pressing mechanism 53 is also installed on the left and right edges and upper edges of the movable seat 55 located on the outside of the chain. The movable seat 55 moves toward the tightening mechanism 54 driven by the propulsion mechanism 52, so that the edge of the U-shaped cavity 7 is close to the edge of the end cover 8, and the pressing mechanism 53 applies force to the outer wall of the U-shaped cavity 7 from the outside to the inside.

[0081] The edge pressing mechanism 53 includes a cylinder installed on the inner side edge of the movable seat 55 and with the output end facing the center of the movable seat 55. A edge pressing block is installed on the output end of the cylinder, and force is applied to the U-shaped cavity 7 through the inward movement of the edge pressing block; the edge pressing mechanism 53 applies force to the U-shaped cavity 7 at a position close to the bite edge, which effectively helps to ensure the stability and reliability of the bite edge.

[0082] A forming method of a square cavity undercut forming device according to this embodiment includes the following steps:

[0083] Step 1: Place the U-shaped cavity 7 with its opening facing downward on the cavity seat 13, and place the end cover 8 with its opening facing upward on the end cover seat 12; the cavity seat 13 and the end cover seat 12 respectively use suction nozzles to suck and fasten the U-shaped cavity 7 and the end cover 8;

[0084] When the U-shaped cavity 7 is placed, it is guided by the guide support seat 14 with the opening facing upward, and the alignment mechanism 17 applies force to the U-shaped cavity 7 from the end through the inclined surface to make it in the preset position, and finally it is sucked by the suction nozzle;

[0085] The inner wall of the end cap seat 12 is provided with a contoured accommodation cavity for positioning the end cap 8;

[0086] Step 2: The flip mechanism 16 works to push the end cover 8 to flip along with the end cover seat 12 toward the U-shaped cavity 7 until the end cover 8 is in the vertical direction. At this time, the end covers 8 on both sides are spaced outside the two ends of the U-shaped cavity 7;

[0087] Step 3: The transfer mechanism 4 works through the transverse movement component 41 to drive the loading jaw 2 to move to the top of the U-shaped cavity 7. The lifting component 42 drives the loading jaw 2 downward. The loading jaw 2 simultaneously grasps the U-shaped cavity 7 and the end cover 8. The cavity seat 13 and the end cover seat 12 release the U-shaped cavity 7 and the end cover 8 respectively. The U-shaped cavity 7 and the end cover 8 are transferred by the transfer mechanism 4 through the loading jaw 2 to the biting machine 5.

[0088] The feeding clamp 2 moves to the feeding pre-assembly machine 1, and the inverted U-shaped clamping jaw seat 21 matches the inverted U-shaped cavity 7. The support block 223 in the bottom supporting mechanism 22 swings inward and upward as the roller 221 moves upward in the guide slot 222, so that the support block 223 supports the U-shaped cavity 7 from the bottom. Simultaneously, the finger blocks 232 in the side clamping mechanisms 23 on both sides move toward each other under the drive of their respective drive mechanisms 233, thereby clamping the end cover 8 from three edge directions.

[0089] After the U-shaped cavity 7 is supported by the support block 223, the positioning mechanism 24 applies force to the sides of the U-shaped cavity 7 at both ends, so that the U-shaped cavity 7 is located at the preset position of the clamping claw seat 21;

[0090] Step 4: The U-shaped cavity 7 is placed on the tightening mechanism 54 and tightened from the inside out, and the end cover 8 is tightened from the outside by the tightening mechanism 56;

[0091] The tightening components 1 542 and 2 545 on the front and rear sides of the tightening mechanism 54 work, and the side plates 5453 are stretched outward, thereby tightening the U-shaped cavity 7 from the inside. At the same time, the side pressure mechanism 57 works, applying a pressing force to the U-shaped cavity 7 from the left and right sides.

[0092] When the fastening mechanism 56 works, the suction nozzle moves inwards to the outer side of the end cover 8 under the push of the cylinder and absorbs the end cover 8 through the external air source;

[0093] Step 5: The end cover 8 moves along the fastening mechanism 56 toward the tightening mechanism 54 until the end cover 8 contacts the edge of the U-shaped cavity 7;

[0094] The pushing mechanism 52 works, pushing the front and rear movable seats 55 toward the central tightening mechanism 54, so that the end caps 8 inside the movable seats 55 are located at both ends of the U-shaped cavity 7 and the edges are connected; the edge pressing mechanism 53 works, and through the work of the cylinder, it pushes the edge pressing blocks inward to press the position near the bite edge of the U-shaped cavity 7 from three directions;

[0095] Step 6: The biting drive mechanism 58 works, and through the transmission of the chain, the edges of the end cover 8 and the U-shaped cavity 7 are riveted and bitten into one piece, so that the end cover 8 and the U-shaped cavity 7 are fixedly connected to form a square cavity structure with one end open;

[0096] The driving motor 582 works, and the driving sprocket 581 drives the chain to move along the track 551, so that the guide biting wheel 583 applies force to the edge where the end cover 8 and the U-shaped cavity 7 are connected in turn. By gradually reducing the size of the circumferential groove 5831 of the guide biting wheel 583, force is applied to the connected edges to make them gradually fit together until the biting edges are fastened together; after the chain is driven for one circle, the riveting is completed.

[0097] The synchronous undercut riveting of the end covers 8 at both ends of the U-shaped cavity 7 is achieved by the synchronous operation of the undercut driving mechanisms 58 in the movable seats 55 on both sides of the tightening mechanism 54 .

[0098] The present invention realizes the forming of the biting of the edges of the square cavities through chain transmission, and has a short single-piece operation time and a fast cycle. The forming stability and consistency are greatly improved through full automation.

[0099] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A square cavity undercut forming device, characterized in that: It comprises a biting machine (5) and a loading and pre-assembling machine (1) arranged at intervals on the left and right, a transfer mechanism (4) being installed on the rear ends of the biting machine (5) and the loading and pre-assembling machine (1), and a loading clamp (2) and a unloading clamp (3) being installed on the transfer mechanism (4); A cavity seat (13) is installed in the middle of the top surface of the loading pre-assembling machine (1), and end cover seats (12) are installed at intervals on the outside of the front and rear ends of the cavity seat (13). The cavity seat (13) is used to place the inverted U-shaped cavity (7), and the end cover seat (12) is used to place the end cover (8) horizontally; the end cover seat (12) is also installed with a turning mechanism (16) for driving it to turn toward the cavity seat (13); The structure of the biting machine (5) is as follows: it includes a machine base (51), a tightening mechanism (54) is installed in the middle of the top surface of the machine base (51), and movable seats (55) are symmetrically installed on the machine base (51) located in front of and behind the tightening mechanism (54), and the inner side surfaces of the movable seats (55) facing each other are respectively fixed with end covers (8), and the two groups of movable seats (55) move synchronously toward or away from each other; the inner side surface of the movable seat (55) located outside the circumference of the end cover (8) is installed with a transmission chain, and the chain is orderly installed with guide biting wheels (583); The biting machine (5) is provided with a tightening mechanism (54) for fixing and limiting the U-shaped cavity (7), and fastening mechanisms (56) for fixing the end covers (8) are provided on the outside of both ends of the tightening mechanism (54). The biting machine (5) also includes a biting drive mechanism (58). The biting drive mechanism (58) rivets the edges of the two ends of the U-shaped cavity (7) and the edges of the end covers (8) that are close to each other as the chain rotates, thereby forming a square cavity structure.

2. A square cavity undercut forming device according to claim 1, characterized in that: The structure of the loading and pre-assembling machine (1) is as follows: it includes a frame (11), a cavity seat (13) is installed in the middle of the top surface of the frame (11), and guide support seats (14) with openings facing upwards are installed at the bottoms of the left and right sides of the cavity seat (13); the end cover seat (12) is rotatably installed on the frame (11) in front of and behind the cavity seat (13) through a rotating shaft (15), and the flip mechanism (16) is correspondingly installed in the frame (11) below the end cover seat (12).

3. A square cavity undercut forming device according to claim 2, characterized in that: The top surface of the cavity seat (13) is provided with a suction nozzle, which is used to suck from the inner top surface of the U-shaped cavity (7); the end cover seat (12) is provided with a similar suction nozzle, which sucks the end cover (8) from the outer side.

4. The square cavity undercut forming device according to claim 2, characterized in that: An alignment mechanism (17) is installed on the upper front end or the upper rear end of the cavity seat (13). The alignment mechanism (17) drives the top alignment block upward, and the alignment block contacts the end of the U-shaped cavity (7) through the inclined surface facing the cavity seat (13).

5. The square cavity undercut forming device according to claim 1, characterized in that: The transfer mechanism (4) comprises a horizontal transverse moving assembly (41) in the left and right directions, two sets of lifting assemblies (42) are installed at intervals on the side of the transverse moving assembly (41) and move along the transverse moving assembly (41), and a loading clamp (2) and a unloading clamp (3) are installed at the bottom ends of the lifting assemblies (42).

6. The square cavity undercut forming device according to claim 1, characterized in that: The loading clamp (2) synchronously transfers the U-shaped cavity (7) and the end covers (8) spaced apart from each other at the front and rear ends from the loading pre-assembly machine (1) to the biting machine (5).

7. The square cavity undercut forming device according to claim 1, characterized in that: The guide biting wheel (583) is rotatably mounted on the inner side surface of the chain link facing the end cover (8), and a groove (5831) is provided on the circumferential surface of the guide biting wheel (583) along the circumferential direction. As the chain is driven, the width of the circumferential groove (5831) of the guide biting wheel (583) gradually decreases. A plurality of guide biting wheels (583) are centrally mounted on one section of the chain. As the chain is driven, a biting drive mechanism (58) is formed.

8. The square cavity undercut forming device according to claim 1, characterized in that: The tightening mechanism (54) tightens the U-shaped cavity (7) from the inside, and a side pressure mechanism (57) is installed on the machine base (51) on the left and right sides of the tightening mechanism (54), and the side pressure mechanism (57) applies a pressing force to the U-shaped cavity (7) from the outside; a pressing mechanism (53) is also installed on the left and right edges and the upper edge of the movable seat (55) located outside the chain, and the movable seat (55) moves toward the tightening mechanism (54) under the drive of the propulsion mechanism (52), so that the edge of the U-shaped cavity (7) is close to the edge of the end cover (8), and the pressing mechanism (53) applies force to the outer wall of the U-shaped cavity (7) from the outside to the inside.

9. A forming method of the square cavity undercut forming device according to claim 1, characterized in that: The steps include: The U-shaped cavity (7) is placed on the cavity seat (13) with its opening facing downward, and the end cover (8) is placed on the end cover seat (12) with its opening facing upward; the cavity seat (13) and the end cover seat (12) respectively adsorb and fasten the U-shaped cavity (7) and the end cover (8); The flip mechanism (16) works to push the end cover (8) to flip along with the end cover seat (12) toward the U-shaped cavity (7) until the end cover (8) is located in a vertical direction. At this time, the end covers (8) on both sides are spaced apart and located outside the two ends of the U-shaped cavity (7); The transfer mechanism (4) drives the loading clamp (2) to move to the top of the U-shaped cavity (7), the loading clamp (2) moves downward and simultaneously grasps the U-shaped cavity (7) and the end cover (8), the cavity seat (13) and the end cover seat (12) respectively release the U-shaped cavity (7) and the end cover (8), and the U-shaped cavity (7) and the end cover (8) are transferred from the transfer mechanism (4) to the biting machine (5) via the loading clamp (2); The U-shaped cavity (7) is placed on the tightening mechanism (54) and tightened from the inside out, and the end cover (8) is tightened from the outside by the tightening mechanism (56); The end cover (8) moves along with the fastening mechanism (56) toward the tightening mechanism (54) until the end cover (8) contacts the edge of the U-shaped cavity (7); The biting drive mechanism (58) works, and through the transmission of the chain, the edges of the end cover (8) and the U-shaped cavity (7) are riveted and bitten into one piece, so that the end cover (8) and the U-shaped cavity (7) are fixedly connected to form a square cavity structure with one end open.

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