A screwing device for automatic assembly of a seat backrest and a seat

Abstract

The present application relates to the technical field of machining, in particular to a screwing device for automatic assembly of a seat backrest and a seat, which comprises a device body, one end of the device body is provided with a fixedly connected frame body, one side of the frame body is provided with symmetrically distributed screwing mechanical hands, one side of the device body close to the frame body is provided with a bearing seat, the top of the bearing seat is provided with symmetrically distributed placing seats, one side of the screwing mechanical hand is provided with a multi-angle adjusting and adapting mechanism, one end of the multi-angle adjusting and adapting mechanism is provided with a limiting and anti-shaking mechanism, and one end of the placing seat is provided with an anti-deviation mechanism, through the cooperation of the multi-angle adjusting and adapting mechanism, the limiting and anti-shaking mechanism and the anti-deviation mechanism, the limitation of screw tightening at different angles is greatly reduced, and the mechanism shaking and screw slipping during the tightening process are effectively prevented, the operation stability is improved, and the workpiece deviation during the tightening process is avoided, further ensuring the precision and consistency of screw locking.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a screw-driving device for automatic assembly of seat backrests and a seat. Background Technology

[0002] Screw connections are one of the most common and widespread mechanical connection methods, widely used in the assembly and production of various products such as electronics, home appliances, automobiles, and new energy. Therefore, the efficiency and quality of screw tightening directly determine the production rhythm and assembly reliability of the entire product. By using screw-driving equipment, compared with manual tightening, not only is the efficiency higher, but the tightening quality is also effectively improved. When installing seat backrests, screw-driving equipment is also needed to assist in tightening. Screw-driving equipment can also automatically feed screws accurately during the installation of seat backrest screws, avoiding the scattering and loss of screws during manual operation, ensuring stable locking and reducing the scrap of semi-finished backrests caused by assembly defects, resulting in lower long-term production costs.

[0003] According to publication number CN112475873A, a highly versatile high-speed automatic screw-driving device is described. Among the three clamping rods, the rod head passes through the through groove of the corresponding rod body to form a triangular space. The head of the rod head is connected to the tail end of the corresponding rod body by a spring. The magnetic strip is attracted to the resistance platform of the lower ring, which hinders the rotation of the lower ring. The upper ring continues to rotate under the drive of the inner cylinder, which drives the clamping rod to stretch the spring, thereby increasing the preload.

[0004] While the aforementioned screw-driving equipment can increase the warning force during processing, it can only tighten screws in one direction. This makes it inconvenient to tighten screws at different angles on the headrest, requiring manual adjustment of the direction multiple times before tightening, thus posing a significant limitation in practical use.

[0005] Based on this, the present invention discloses a screw-driving device and a seat for automatic assembly of seat backrests. Summary of the Invention

[0006] To address the limitations of the prior art in tightening screws at different angles, this invention provides a screw-driving device for automatic assembly of seat cushions. The device includes a body, with a fixedly connected frame at one end. Symmetrically distributed screw-driving robotic arms are arranged on one side of the frame. A support seat is located at the top of the device body near the frame, and symmetrically distributed placement seats are located at the top of the support seat. A multi-angle adjustment mechanism is provided on one side of each screw-driving robotic arm. A limit and anti-sway mechanism is provided at one end of the multi-angle adjustment mechanism. An anti-deviation mechanism is provided at one end of each placement seat. The multi-angle adjustment mechanism includes a sliding plate on one side of the frame, an adjusting plate slidably connected to one side of the sliding plate, and a mounting plate at the end of the adjusting plate away from the sliding plate. Since screws are usually tightened at a fixed angle when automatically tightened, the operation is quite limited. This technical solution uses multi-angle adjustment to achieve tightening at different angles. Therefore, an angle adjustment structure is needed in addition to tightening the screws. As a further improvement to this technical solution, a drive servo motor is installed inside the adjustment plate. The output end of the drive servo motor is connected to a drive rod. A rotating rod is provided at one end of the drive rod. A synchronous sleeve rod is sleeved on the surface of the rotating rod. An electric push rod is installed at the end of the rotating rod near the synchronous sleeve rod. A synchronous rod is provided on the side of the adjustment plate near the drive rod, connected by a bearing. A synchronous pulley is connected between the synchronous rod and the drive rod. An electric push rod is provided on one side of the synchronous pulley. A bevel gear set is provided at one end of the synchronous rod. An adjustment seat is fixedly connected to the end of the rotating rod. An adjustment seat is connected to the second adjustment seat via a connecting rod at one end of the bevel gear set. An adjustment ball is provided between the second adjustment seat and the first adjustment seat. A movable rod is movably connected to the top of the adjustment ball. A rotating rod is fixedly connected to one side of the adjustment ball.

[0007] Based on this, since it is easy to wobble after multi-angle adjustments, a fixed structure is needed to prevent deviations caused by wobble after angle adjustments; As a further improvement to this technical solution, the limiting and anti-sway mechanism includes a fixed gear disc fixedly connected to one side of the mounting plate, a gear ring meshing with one side of the fixed gear disc, an electric push rod connected to the end of the gear ring away from the fixed gear disc, a micro motor mounted on one side of the adjusting plate, a disc connected to the output end of the micro motor, a fixed rod welded to one end of the disc, a movable frame on the surface of the fixed rod, and a fixedly connected plug-in slider at one end of the movable frame.

[0008] Because the screws may wobble during tightening, they can easily cause stripping of the threads on the workpiece, so a stable structure is needed. As a further improvement to this technical solution, the anti-deviation mechanism includes a mounting base plate disposed at the bottom of the placement seat. A fixed shaft rod is fixedly connected to one end of the mounting base plate. A movable shaft rod is disposed inside the fixed shaft rod. A limiting pressure plate is fixedly connected to the top of the movable shaft rod. A pull plate is fixedly connected to the bottom of the fixed shaft rod. A uniformly distributed insertion block is disposed on one side of the pull plate. A limiting spring is connected between the pull plate and the adjusting horizontal plate. A fixedly connected insertion sliding block is disposed at the bottom of the adjusting horizontal plate. A limiting plate is disposed inside the mounting base plate near the insertion sliding block. A limiting groove is opened at one end of the limiting plate. An anti-deviation plate is disposed at one end of the limiting plate. A uniformly distributed return spring is disposed at one end of the anti-deviation plate.

[0009] The present invention also provides a seat, including a seat body and a seat headrest, wherein the seat headrest is assembled onto the seat body by a screw-driving device for automatic assembly of the seat headrest as described above.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the screw-driving device and seat for automatic assembly of seat backrests, the present invention realizes multi-dimensional automatic angle adjustment of the screw-driving robot through a multi-angle adjustment and adaptation mechanism, eliminating the need for manual repeated adjustment of the workpiece posture, effectively solving the limitation of existing equipment in tightening screws at different angles, and significantly improving the versatility and operating efficiency of the equipment.

[0011] 2. In this screw-driving device and seat for automatic assembly of seat backrests, the double locking limit design of the limit and anti-sway mechanism enables rapid locking after angle adjustment, effectively avoiding loosening, shaking and stripping of screws during the tightening process, and greatly improving the operational stability and locking quality of the equipment.

[0012] 3. In the screw-driving equipment and seat used for automatic assembly of seat backrests, the anti-displacement mechanism can reliably position and limit the workpiece, prevent the workpiece from shaking or shifting during the tightening process, ensure the positional accuracy of the screw fastening, reduce the workpiece scrap rate, and improve the production yield. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall front structure of the present invention; Figure 2 This is a schematic diagram of the overall rear view of the present invention; Figure 3 This is a three-dimensional structural diagram of the screw-driving robot of the present invention; Figure 4 This is a three-dimensional structural schematic diagram of the adjustment seat of the present invention; Figure 5This is a three-dimensional structural diagram of the servo motor driven by the present invention; Figure 6 This is a three-dimensional structural diagram of the synchronous belt pulley of the present invention; Figure 7 This is a schematic diagram of the synchronous sleeve rod structure of the present invention; Figure 8 This is a three-dimensional structural diagram of the adjusting ball of the present invention; Figure 9 This is a three-dimensional structural schematic diagram of the electric push rod II of the present invention; Figure 10 This is a three-dimensional structural diagram of the limiting and anti-sway mechanism of the present invention; Figure 11 This is a three-dimensional structural diagram of the fixed shaft of the present invention; Figure 12 For the present invention Figure 11 A magnified schematic diagram of a portion of the structure of A in the diagram; Figure 13 This is a three-dimensional structural diagram of the limiting plate of the present invention; Figure 14 For the present invention Figure 13 A magnified schematic diagram of a local structure of B.

[0014] The meanings of the labels in the diagram are as follows: 1. Equipment body; 2. Frame; 3. Screw-driving robot; 4. Support base; 5. Placement base; 6. Multi-angle adjustment adapter mechanism; 601. Slide plate; 602. Adjustment plate; 603. Mounting plate; 604. Drive servo motor; 605. Drive rod; 606. Rotating rod; 607. Synchronous sleeve rod; 608. Electric push rod one; 609. Synchronous rod; 610. Synchronous pulley; 611. Electric push rod two; 612. Bevel gear set; 613. Adjustment seat one; 614. Adjustment seat two; 615. Adjustment ball; 616. Movable rod; 617. Rotating rod; 7. Limiting and anti-sway mechanism; 701. Fixed gear plate; 702. Gear ring; 703. Electric push rod three; 704. Micro motor; 705. Disc; 706. Fixed rod; 707. Movable frame; 708. Insertion slider; 8. Anti-deviation mechanism; 801. Mounting base plate; 802. Fixed shaft; 803. Movable shaft; 804. Limiting pressure plate; 805. Adjusting cross plate; 806. Pull plate; 807. Insertion block; 808. Limiting spring; 809. Insertion sliding block; 810. Limiting plate; 811. Limiting groove; 812. Anti-deviation plate; 813. Return spring; 9. Workstation chairs Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0016] The existing methods have significant limitations when tightening screws at different angles.

[0017] Therefore, the present invention provides a screw-driving device and a seat for automatic assembly of seat backrests. The device includes a body 1, a frame 2 fixedly connected to one end of the body 1, screw-driving manipulators 3 symmetrically distributed on one side of the frame 2, a support seat 4 at the top of the body 1 near the frame 2, and symmetrically distributed placement seats 5 at the top of the support seat 4. A multi-angle adjustment and adaptation mechanism 6 is provided on one side of the screw-driving manipulators 3, a limit anti-sway mechanism 7 is provided at one end of the multi-angle adjustment and adaptation mechanism 6, and an anti-deviation mechanism 8 is provided at one end of the placement seats 5. The multi-angle adjustment and adaptation mechanism 6 includes a slide plate 601 provided on one side of the frame 2, an adjustment plate 602 slidably connected to one side of the slide plate 601, and a mounting plate 603 at the end of the adjustment plate 602 away from the slide plate 601.

[0018] For details, see Figure 8 and Figure 9 As shown, a drive servo motor 604 is installed inside the adjustment plate 602. The output end of the drive servo motor 604 is connected to a drive rod 605. A rotating rod 606 is provided at one end of the drive rod 605. A synchronous sleeve rod 607 is sleeved on the surface of the rotating rod 606. An electric push rod 608 is installed at the end of the rotating rod 606 near the synchronous sleeve rod 607.

[0019] During operation, both the drive rod 605 and the rotating rod 606 have toothed blocks at their ends, which are evenly distributed at the ends. This ensures that the drive rod 605 and the rotating rod 606 rotate synchronously after the toothed blocks of the same size and number inside the synchronous sleeve rod 607 are moved and sleeved. The ends of the toothed blocks are all machined with a 45° guide chamfer. During sleeved connection, the chamfer plays a role in flaring and guiding. Even if there is a slight misalignment in the circumferential direction of the teeth, the conical surface can guide the tooth tip to slide into the tooth groove, directly avoiding tooth tip jamming, collision interference, and reducing sliding sleeve resistance.

[0020] Further, see Figure 8 and Figure 9As shown, a synchronizing rod 609 connected to the driving rod 605 is provided on the side of the adjusting plate 602 near the driving rod 605 via a bearing. A synchronizing pulley 610 is connected between the synchronizing rod 609 and the driving rod 605. An electric push rod 611 is provided on one side of the synchronizing pulley 610. A bevel gear set 612 is provided at one end of the synchronizing rod 609. An adjusting seat 613 is fixedly connected to the end of the rotating rod 606. An adjusting seat 614 is connected to one end of the bevel gear set 612 via a connecting rod. An adjusting ball 615 is provided between the adjusting seat 614 and the adjusting seat 613. A movable rod 616 is movably connected to the top of the adjusting ball 615. A rotating rod 617 is fixedly connected to one side of the adjusting ball 615.

[0021] See Figure 4 As shown, a stabilizing support rod is provided between the adjusting seat 613 and the adjusting plate 602. The stabilizing support rod is fixedly connected to the adjusting seat 613, while the stabilizing support rod is slidably connected to the adjusting plate 602. The adjusting plate 602 also has an arc-shaped slot for the stabilizing support rod to slide. The stabilizing support rod can provide support for the adjusting seat 613, ensuring that the drive rod 605 and the rotating rod 606 are stably placed when they are not connected by the synchronous sleeve rod 607.

[0022] The adjusting seat 613 and the adjusting plate 602 are slidably connected by a sliding rod, and the bottom end of the movable rod 616 is provided with a ball. At the same time, the adjusting ball 615 has a circular groove inside that matches the ball, which can ensure that the adjusting ball 615 does not interfere with the movable rod 616 when it rotates.

[0023] Among them, the electric push rod 608 and the electric push rod 611 are independently controlled, and when the adjusting ball 615 swings and rotates for adjustment, the movable rod 616 and the adjusting ball 615 are movably connected, so there will be no interference. When the movable rod 616 rotates left and right to rotate the adjusting ball 615, the adjusting seat 614 has a through groove for the rotating rod 617 to rotate, so the adjusting ball 615 will not be interfered with by the presence of the adjusting seat 614 when it rotates left and right.

[0024] In use, the electric push rod 608 at one end of the rotating rod 606 can be started in advance, so that the electric push rod 608 can push the synchronous sleeve rod 607 connected to the output end. As the synchronous sleeve rod 607 moves, it can slide on the surface of the rotating rod 606, and after sliding, it can engage with the drive rod 605 at one end, and then start the drive servo motor 604. The drive servo motor 604 can rotate the drive rod 605 connected to the output end. As the drive rod 605 rotates, the rotating rod 606 can rotate through the connected synchronous sleeve rod 607. After the rotating rod 606 rotates, the adjusting seat 613 connected to one end can rotate synchronously. Then the adjusting seat 613 can rotate the adjusting ball 615 through the set movable rod 616. As the adjusting ball 615 rotates, the rotating rod 617 at one end can rotate synchronously. Since the end of the rotating rod 617 is fixedly connected to the mounting plate 603, the mounting plate 603 can drive the screw-driving robot 3 installed on one side to rotate when it rotates, and can be adjusted to a suitable tightening angle, thereby adjusting the installation angle of the screw. At the same time, the electric push rod 608 can be activated to maintain the adjusted angle after the rotating rod 606 loses power. Then, the electric push rod 611 is powered on and started, so that the electric push rod 611 can tighten the synchronous pulley 610, so that the synchronous pulley 610 can make tension contact between the drive rod 605 and the synchronous rod 609, so that the drive rod 605 can rotate the connected synchronous rod 609 when it rotates. As a result, the synchronizing rod 609 can rotate the adjusting seat 614 through the bevel gear set 612, so that the adjusting seat 614 can push the rotating rod 617 after rotation, so that the rotating rod 617 can rotate left and right. This allows the screw-driving equipment used for automatic assembly of seat pillows to adjust different angles when tightening screws, avoiding the need for manual swinging of the workpiece and reducing the limitations of using the screw-driving equipment for automatic assembly of seat pillows.

[0025] Further, see Figure 10 As shown, the limiting and anti-sway mechanism 7 includes a fixed gear plate 701 fixedly connected to one side of the mounting plate 603, a gear ring 702 meshing with one side of the fixed gear plate 701, an electric push rod 703 connected to the end of the gear ring 702 away from the fixed gear plate 701, a micro motor 704 installed on one side of the adjusting plate 602, a disc 705 connected to the output end of the micro motor 704, a fixed rod 706 welded to one end of the disc 705, a movable frame 707 on the surface of the fixed rod 706, and a fixedly connected plug-in slider 708 at one end of the movable frame 707.

[0026] according to Figure 10 As shown, during use, the electric push rod 703 and the micro motor 704 can be started separately by adjusting the angle of the mounting plate 603. After the micro motor 704 is powered on, it can move the gear ring 702 connected to the output end. Since the mounting plate 603 will adjust the angle of the connected fixed gear plate 701 synchronously after the angle is adjusted. This allows the gear ring 702 to mesh with the fixed gear disc 701 after the angle has been adjusted, enabling rapid positioning after adjustment and preventing loosening. Simultaneously, as the micro motor 704 is powered on and started, it can rotate the disc 705 connected to the output end. As the disc 705 rotates, it can rotate the fixed rod 706 set at one end. With the rotation of the fixed rod 706, it can move inside the movable frame 707. Furthermore, during movement, the movable frame 707 can be pushed, allowing it to move. As the movable frame 707 moves, it can pull the insertion slider 708 at the end, enabling the insertion slider 708 to engage with the mounting plate 603. This allows the mounting plate 603 to be quickly positioned. Additionally, the mounting plate 603 has evenly distributed insertion slots inside, with one side of the insertion slots being arc-shaped. This design prevents stripping of screws due to loose mounting plate 603 when tightening, ensuring stable positioning and locking of the mounting plate 603 after adjustment to the appropriate angle.

[0027] Furthermore, the drive rod 605, in conjunction with the synchronous sleeve rod 607, rotates the rotating rod 606, thereby rotating the first adjusting seat 613. After adjusting the adjusting ball 615 according to the movable rod 616, the rotating rod 617, which is fixedly connected to one end of the adjusting ball 615, can rotate the mounting plate 603 left and right. After the left and right rotation angles are determined, the mounting plate 603 is stably locked by the insertion of the aforementioned insertion slider 708 into the insertion slot. This facilitates the processing of screws at different angles on the left and right. When tightening the side angle, the mounting plate 603 can be flipped and adjusted by rotating the second adjusting seat 614. After that, the angle is locked by moving the toothed ring 702. The left and right rotation adjustment and flipping adjustment can achieve stable processing according to different locking methods. It is highly applicable to processing screws at different positions, and the different locking methods ensure that there will be no back movement or shaking due to gravity or vibration after adjustment.

[0028] Both sides of the movable frame 707 are equipped with through-connecting guide rods, which can provide stability and assistance during movement and prevent swaying.

[0029] Further, see Figure 11As shown, the anti-displacement mechanism 8 includes a mounting base plate 801 disposed at the bottom of the placement seat 5. A fixed shaft rod 802 is fixedly connected to one end of the mounting base plate 801. A movable shaft rod 803 is disposed inside the fixed shaft rod 802. A limiting pressure plate 804 is fixedly connected to the top of the movable shaft rod 803. A pull plate 806 is fixedly connected to the bottom of the fixed shaft rod 802. Evenly distributed insertion blocks 807 are disposed on one side of the pull plate 806. A limiting spring 808 is connected between the pull plate 806 and the adjusting cross plate 805.

[0030] The bottom end of the movable shaft 803 is provided with a fixedly connected plug sleeve, which can be stably engaged with the plug block 807, so that the movable shaft 803 can be stably locked after being adjusted to a suitable position.

[0031] Further, see Figure 11 and Figure 12 As shown, the bottom end of the adjusting plate 805 is provided with a fixedly connected plug-in sliding block 809. Inside the mounting base plate 801, near the plug-in sliding block 809, a limit plate 810 is provided. One end of the limit plate 810 is provided with evenly distributed limit grooves 811. One end of the limit plate 810 is provided with an anti-deviation plate 812. One end of the anti-deviation plate 812 is provided with evenly distributed reset springs 813.

[0032] The bottom end of the sliding block 809 is provided with a ball bearing, which can provide sliding force when moving.

[0033] according to Figure 11 and Figure 12 As shown, during use, the fixed shaft 802 can be pressed downwards to move the adjusting horizontal plate 805 at the bottom. As the adjusting horizontal plate 805 moves, it can move the insertion sliding block 809 at the bottom. As the insertion sliding block 809 moves, it can press the anti-deviation plate 812 at the bottom. And as the anti-deviation plate 812 moves, it can press the evenly distributed reset springs 813 at the bottom. Simultaneously, as the sliding block 809 moves, it can separate from the limiting groove 811 at the bottom of the limiting plate 810. Then, the fixed shaft 802 can be pulled, causing the fixed shaft 802 to move the sliding block 809 at the bottom. Thus, the position of the fixed shaft 802 can be adjusted. After adjusting to the appropriate position, the pull plate 806 can be pulled, allowing the pull plate 806 to move the evenly distributed plug blocks 807 at one end. Simultaneously, as the pull plate 806 moves, it can compress the limiting spring 808 set on one side. When the pull plate 806 moves, it can separate the insertion block 807 from the insertion block set at the end of the movable shaft 803. Then the movable shaft 803 can be rotated, so that the movable shaft 803 can move the limiting pressure plate 804 set at the top after rotation, thereby avoiding obstructing the placement of the workpiece. After the workpiece is placed. The rotated movable shaft 803 can be pulled upwards, allowing it to move along the groove provided by the fixed shaft 802. After adjusting to a suitable position, the movable shaft 803 can be reset and rotated, so that it can limit the placed workpiece through the limiting pressure plate 804 connected to the top, preventing wobbling and displacement during subsequent screw tightening. At the same time, as the fixed shaft 802 moves, it can be adjusted according to the size of the workpiece and the screw installation position, avoiding obstruction of workpieces of different sizes and installation positions, and enabling auxiliary screw tightening of workpieces of different sizes. Furthermore, with the auxiliary grooves evenly provided by the fixed shaft 802, the limiting position of the movable shaft 803 can be adjusted to accommodate various workpieces of different sizes, improving the stability of the equipment when tightening screws.

[0034] Further, see Figure 1 and Figure 2 As shown, a workstation chair 9 is installed on one side of the equipment body 1.

[0035] The workstation chair 9 is located on one side of the equipment body 1, which can reduce fatigue from long-term operation, improve stability, enhance human-machine interaction experience, and reduce labor intensity.

[0036] It should be noted that when tightening screws on inclined surfaces, the electric push rod 608 is energized and activated. Through the engagement of the synchronous sleeve rod 607 and the drive rod 605, the adjusting seat 613 and the movable rod 616 can rotate. This rotation adjusts the rotating rod 617, which is fixedly connected to one end of the movable rod 616, causing the mounting plate 603 to rotate. The rotation angle can be selectively adjusted according to different inclined surfaces, and the screws on the inclined surfaces are tightened after reaching a specific angle. For tightening ordinary workpiece plates in a straight up-and-down motion, the mounting plate 603 can be adjusted to a suitable position before the synchronous sleeve rod... Disengagement of 607 enables a straight-up-down conventional tightening operation. After disengagement of the synchronous sleeve rod 607, the second electric push rod 611 can be energized to tighten the synchronous pulley 610 and drive the synchronous rod 605 and synchronous rod 609 to rotate synchronously. Through the rotation of the bevel gear set 612 and the second adjusting seat 614, the rotating rod 617 is deflected, which can drive the mounting plate 603 to deflect and adjust. For deviations in the screw holes and misaligned screw hole positions, quick adjustments and improvements can be made. The first electric push rod 608 and the second electric push rod 611 do not start synchronously, and different usage modes can be switched according to different usage conditions.

[0037] In summary, the present invention achieves the following technical effects through the coordinated operation of the multi-angle adjustment and adaptation mechanism 6, the limiting and anti-sway mechanism 7, and the anti-deviation mechanism 8: First, the multi-angle adjustment and adaptation mechanism 6 can be driven by the servo drive and the bevel gear set 612 to realize the automatic adjustment of the screw-driving robot 3 in multiple dimensions, eliminating the need for manual repeated adjustment of the workpiece posture and greatly reducing the limitations of tightening screws at different angles. Secondly, after the angle adjustment is completed, the limiting and anti-sway mechanism 7 can achieve double locking and limiting through the engagement of the toothed ring 702 and the plug-in slider 708, which effectively prevents the mechanism from shaking and the screw from stripping during the tightening process, and improves the stability of operation. Then, the anti-displacement mechanism 8 can reliably position the workpiece through the limiting pressure plate 804 to avoid workpiece displacement during tightening, further ensuring the accuracy and consistency of screw fastening.

[0038] Working principle: First, place the workpiece to be processed on the placement seat 5, and then activate the anti-deviation mechanism 8: press down the fixed shaft 802 to drive the adjusting horizontal plate 805 and the plug-in sliding block 809 to move, so that the plug-in sliding block 809 separates from the limiting groove 811. Pull the fixed shaft 802 to adjust its position, and rotate the movable shaft 803 so that the limiting pressure plate 804 avoids the workpiece placement area. After the workpiece is placed, reset the movable shaft 803 and pull it upward so that the limiting pressure plate 804 presses against the workpiece surface, realizing reliable positioning of the workpiece and preventing shaking and deviation during tightening.

[0039] Then, the multi-angle adjustment and adaptation mechanism 6 is activated: the electric push rod 608 pushes the synchronous sleeve rod 607 to engage with the drive rod 605, driving the servo motor 604 to rotate the drive rod 605. The synchronous sleeve rod 607 drives the rotating rod 606 and the adjusting seat 613 to rotate. The movable rod 616 and the adjusting ball 615 drive the rotating rod 617 to rotate, thereby driving the mounting plate 603 and the screw-driving robot 3 to achieve rotational adjustment around the axis. At the same time, the electric push rod 611 tightens the synchronous belt pulley 610, causing the drive rod 605 to drive the synchronous rod 609 to rotate. The bevel gear set 612 drives the adjusting seat 614, which, together with the adjusting ball 615, pushes the rotating rod 617 to achieve left and right angle adjustment, so that the screw-driving robot 3 is adjusted to the tightening angle that matches the screw hole of the workpiece.

[0040] After the angle adjustment is completed, the limit anti-sway mechanism 7 is activated: the electric push rod 703 pushes the gear ring 702 to mesh and lock with the fixed gear plate 701. At the same time, the micro motor 704 drives the disc 705 to rotate, and through the fixed rod 706 pushes the movable frame 707 and the plug-in slider 708 to insert into the plug-in slot of the mounting plate 603, so as to achieve double limit anti-sway and avoid the mechanism from loosening or stripping during the tightening process.

[0041] Finally, the screw-tightening robot 3 completes the screw-tightening operation at a preset angle. After the operation is completed, each mechanism resets in sequence, and the next workpiece can be processed.

[0042] This application also provides a seat, including a seat body and a seat headrest, wherein the seat headrest is assembled onto the seat body by a screw-driving device for automatic assembly of the seat headrest as described above.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw-driving device for automatic assembly of seat backrests, comprising a device body (1), characterized in that: One end of the device body (1) is provided with a fixedly connected frame (2), and one side of the frame (2) is provided with symmetrically distributed screw-driving manipulators (3). The top of the device body (1) is provided with a bearing seat (4) near the frame (2), and the top of the bearing seat (4) is provided with symmetrically distributed placement seats (5). One side of the screw-driving manipulator (3) is provided with a multi-angle adjustment adapter mechanism (6), one end of the multi-angle adjustment adapter mechanism (6) is provided with a limit anti-sway mechanism (7), and one end of the placement seat (5) is provided with an anti-deviation mechanism (8). The multi-angle adjustment adapter (6) includes a slide plate (601) disposed on one side of the frame (2), an adjustment plate (602) is slidably connected to one side of the slide plate (601), and an installation plate (603) is disposed at the end of the adjustment plate (602) away from the slide plate (601).

2. The screw-driving device for automatic assembly of seat backrests according to claim 1, characterized in that: The adjustment plate (602) is equipped with a drive servo motor (604). The output end of the drive servo motor (604) is connected to a drive rod (605). One end of the drive rod (605) is provided with a rotating rod (606). A synchronous sleeve rod (607) is sleeved on the surface of the rotating rod (606). An electric push rod (608) is installed at the end of the rotating rod (606) near the synchronous sleeve rod (607).

3. The screw-driving device for automatic assembly of seat backrests according to claim 2, characterized in that: The adjusting plate (602) is provided with a synchronous rod (609) connected by a bearing on the side near the drive rod (605). A synchronous pulley (610) is connected between the synchronous rod (609) and the drive rod (605). An electric push rod (611) is provided on one side of the synchronous pulley (610). A bevel gear set (612) is provided at one end of the synchronous rod (609).

4. The screw-driving device for automatic assembly of seat backrests according to claim 3, characterized in that: The end of the rotating rod (606) is provided with a fixedly connected adjusting seat one (613), and one end of the bevel gear set (612) is connected to an adjusting seat two (614) via a connecting rod. An adjusting ball (615) is provided between the adjusting seat two (614) and the adjusting seat one (613). A movable rod (616) is movably connected to the top of the adjusting ball (615), and a rotating rod (617) is fixedly connected to one side of the adjusting ball (615).

5. The screw-driving device for automatic assembly of seat backrests according to claim 1, characterized in that: The limiting anti-sway mechanism (7) includes a fixed gear plate (701) fixedly connected to one side of the mounting plate (603), a gear ring (702) meshing with one side of the fixed gear plate (701), an electric push rod (703) connected to one end of the gear ring (702) away from the fixed gear plate (701), and a micro motor (704) installed on one side of the adjusting plate (602).

6. The screw-driving device for automatic assembly of seat backrests according to claim 5, characterized in that: The output end of the micro motor (704) is connected to a disc (705). One end of the disc (705) is provided with a fixed rod (706) that is welded together. The surface of the fixed rod (706) is provided with a movable frame (707). One end of the movable frame (707) is provided with a fixedly connected plug-in slider (708).

7. The screw-driving device for automatic assembly of seat backrests according to claim 6, characterized in that: The anti-displacement mechanism (8) includes a mounting base plate (801) at the bottom of the placement seat (5). One end of the mounting base plate (801) is provided with a fixed shaft rod (802) that is fixedly connected. Inside the fixed shaft rod (802) is a movable shaft rod (803). At the top of the movable shaft rod (803) is a limiting pressure plate (804) that is fixedly connected.

8. The screw-driving device for automatic assembly of seat backrests according to claim 7, characterized in that: The bottom end of the fixed shaft (802) is provided with a fixedly connected pull plate (806), and a uniformly distributed plug block (807) is provided on one side of the pull plate (806). A limit spring (808) is connected between the pull plate (806) and the adjusting cross plate (805).

9. The screw-driving device for automatic assembly of seat backrests according to claim 8, characterized in that: The bottom end of the adjusting plate (805) is provided with a fixedly connected plug-in sliding block (809). The mounting base plate (801) is provided with a limit plate (810) at one end near the plug-in sliding block (809). One end of the limit plate (810) is provided with a uniformly distributed limit groove (811). One end of the limit plate (810) is provided with an anti-deviation plate (812). One end of the anti-deviation plate (812) is provided with a uniformly distributed reset spring (813).

10. A type of seat, characterized in that, The device includes a seat body and a seat headrest, wherein the seat headrest is assembled onto the seat body by a screw-driving device for automatic assembly of the seat headrest as described in any one of claims 1 to 9.

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