Automatic tightening device for diesel engine connecting bolt

Abstract

The application discloses a diesel engine connecting bolt automatic tightening device and belongs to the field of bolt automatic tightening. The diesel engine connecting bolt automatic tightening device comprises a base, a vertical electric sliding rail module is fixedly connected to one side of the top of the base, and the outer surface of the vertical electric sliding rail module is slidably connected with a longitudinal electric sliding rail module. The device can realize that when the bolt is tightened in place, the bolt cannot continue to rotate, so that the cylinder stops rotating, the driving motor continues to rotate at this time, the contact force between the screw rod and the triangular block gradually increases, when the force in the vertical direction is greater than the force of the first spring deformation, the triangular block moves downward, the screw rod continues to slide on the oblique edge of the triangular block, so that the screw rod passes through the triangular block. This not only can guarantee that the driving motor will not be stuck and damaged due to the inability to rotate after tightening the bolt, but also can avoid the phenomenon of tooth slipping due to excessive torque force, avoid damage to the equipment, reduce the damage of the thread, prolong the service life of the bolt.

Description

Technical Field

[0001] This invention relates to the field of automatic bolt tightening, and more specifically, to an automatic bolt tightening device for diesel engine connections. Background Technology

[0002] Bolted connections, in engineering structures, are a method of connecting two or more parts or components into a whole using bolts, and are mostly used in steel structures. Bolted connections are simple, reliable, and easy to assemble and disassemble, making them a common fixing method widely used in electromechanical products. The quality of the bolted connections directly affects the overall quality of the product. Diesel engines, for example, require a large number of bolts for fixing during assembly.

[0003] Traditional bolt tightening relies on manual labor, which is labor-intensive and inefficient. Application publication number CN109794763A discloses a six-axis robot for automatic bolt tightening, which can automatically tighten bolts, improving bolt connection accuracy and assembly quality, and shortening installation time. However, in practice, different bolt sizes and models require different sized sleeves, making operation cumbersome and inconvenient. Furthermore, different bolts require different numbers of turns and different torques; excessive torque can cause stripping and accelerate wear on the device's components, while insufficient torque cannot fully tighten the bolts. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide an automatic tightening device for diesel engine connecting bolts.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] An automatic bolt tightening device for diesel engines includes a base. A vertical electric slide rail module is fixedly connected to one side of the top of the base. A longitudinal electric slide rail module is slidably connected to the outer surface of the vertical electric slide rail module. A transverse electric slide rail module is slidably connected inside the longitudinal electric slide rail module. An electric slider is slidably connected inside the transverse electric slide rail module. A torsion component for automatically tightening bolts is provided at the bottom of the electric slider.

[0007] The torsion assembly includes a fixed plate fixed to the bottom of the electric slider. A drive motor is fixedly connected to the middle of the bottom of the fixed plate. A disc is fixedly connected to the output end of the drive motor. A nut is rotatably connected to the top edge of the disc. A screw is threaded into the nut. Connecting rods are fixedly connected to both sides of the bottom of the fixed plate. A ring is fixedly connected to the bottom of the two connecting rods. A cylinder is rotatably connected to the inner surface of the ring. A support plate is fixedly connected to the top of the inner surface of the cylinder. A telescopic rod is slidably connected inside the support plate. A triangular block is fixedly connected to the top of the telescopic rod. A first spring is sleeved on the outer surface of the telescopic rod. An alignment assembly is connected to the bottom of the inner cylinder. A tightening assembly is provided on the alignment assembly.

[0008] Furthermore, the first spring is located between the support plate and the triangular block, the bottom of the screw penetrates the interior of the disk, and the screw and the disk slide relative to each other.

[0009] Furthermore, the tightening assembly includes a bucket-shaped cylinder fixed to the alignment assembly. Hydraulic rods are symmetrically fixedly connected to the middle of the inner surface of the bucket-shaped cylinder. A rack is fixedly connected to the output end of the hydraulic rod. A first servo motor is fixedly connected to the top of the inner surface of the bucket-shaped cylinder. A first gear is fixedly connected to the outer surface of the output end of the first servo motor. A rotating disk is fixedly connected to the output end of the first servo motor. Two drive slots are evenly opened inside the rotating disk. Six tightening blocks are slidably connected to the bottom of the inner surface of the bucket-shaped cylinder. A drive rod is fixedly connected to the top of the tightening block. The top of the drive rod extends into the interior of the drive slot.

[0010] Furthermore, the bottom of the tightening block is provided with an inclined chamfer near the center of the bucket-shaped cylinder, and one side of the tightening block extends out of the interior of the bucket-shaped cylinder.

[0011] Furthermore, the rack and the first gear are at the same horizontal height, the first gear is located between the two racks, and the racks and the first gear mesh with each other.

[0012] Furthermore, a horizontal plate is fixedly connected to the top of the first servo motor, and the two sides of the horizontal plate are fixedly connected to the inner surface of the bucket-shaped cylinder.

[0013] Furthermore, the alignment assembly includes a sliding sleeve that slides on the bottom of the inner surface of the cylinder, a spring seat that is axially symmetrically fixed on the bottom of the inner surface of the cylinder, and a driving component that is axially symmetrically fixed at the middle of the inner surface of the cylinder. A second spring is fixedly connected to the bottom of the spring seat. An arc-shaped groove is axially symmetrically opened on the bottom of the inner surface of the sliding sleeve. A sliding plate is slidably connected inside the arc-shaped groove. The bottom of the sliding sleeve is fixedly connected to the top of the bucket-shaped cylinder.

[0014] Furthermore, the driving component includes a second servo motor that is axially symmetrically fixed at the middle of the inner surface of the cylinder and an arc-shaped rack that is axially symmetrically fixed to the top of the inner surface of the sliding sleeve. The output end of the second servo motor is fixedly connected to a driving sleeve, a spline shaft is slidably connected inside the driving sleeve, and a second gear is fixedly connected to the outer surface of the spline shaft.

[0015] Furthermore, the second gear meshes with the arc-shaped rack, and a connecting plate is provided at the bottom of the spline shaft, with one side of the connecting plate fixedly connected to the inner surface of the sliding sleeve.

[0016] Furthermore, the bottom of the second spring is fixedly connected to the top of the sliding plate, the sliding plate slides inside the arc groove, an arc groove is provided in the middle of the inside of the cylinder, and a connecting arc plate is provided on the outer surface of the sliding sleeve, the connecting arc plate slides inside the arc groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This solution incorporates a torsion assembly. When the bolt is fully tightened, it cannot continue to rotate, causing the cylinder to stop rotating. At this point, the drive motor continues to rotate, and the contact force between the screw and the triangular block gradually increases. When the vertical force exceeds the force generated by the deformation of the first spring, the triangular block moves downward, and the screw continues to slide along the hypotenuse of the triangular block. This ensures that the drive motor does not jam and become damaged after tightening the bolt, and also prevents stripping due to excessive torque, thus avoiding damage to the equipment, reducing thread damage, and extending the bolt's service life.

[0018] 2. This solution incorporates a tightening assembly. The rotating disc drives the drive rod to slide inside the drive groove, causing the drive rod to gradually move away from the center of the rotating disc. This causes multiple tightening blocks to slide inside the bucket-shaped cylinder and move away from each other. The first gear is fixed by a rack and pinion, thereby fixing the rotating disc and ensuring the stability of the tightening blocks. This reduces the need to change different sleeves and minimizes unnecessary disassembly and assembly.

[0019] 3. This solution, by incorporating an alignment component, enables the sliding sleeve to rotate continuously in both directions inside the cylinder. Through transmission, multiple tightening blocks rotate back and forth continuously. Simultaneously, the cylinder moves closer to the bolt, while the sliding sleeve can no longer move. Consequently, the cylinder compresses the second spring through the spring seat. When the space formed by the six tightening blocks coincides with the bolt, the elastic force of the second spring pushes the six tightening blocks to fit around the bolt. This allows the six tightening blocks to be quickly fitted onto the bolt before tightening, achieving precise positioning. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the torsion component structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the torsion component structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the torsion component structure of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the tightening assembly structure of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the tightening assembly structure of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the alignment component structure of the present invention; Figure 8 For the present invention Figure 3 A magnified structural diagram at point A.

[0021] Explanation of the labels in the diagram: 1. Base; 2. Vertical electric slide rail module; 3. Longitudinal electric slide rail module; 4. Lateral electric slide rail module; 5. Torsion assembly; 51. Fixing plate; 52. Drive motor; 53. Nut; 54. Disc; 55. Ring; 56. Cylinder; 57. Screw; 58. Tightening assembly; 581. Bucket-shaped cylinder; 582. First servo motor; 583. Tightening block; 584. First gear; 585. Hydraulic rod; 586. Rotary disc; 587. Drive slot; 588. Drive rod; 589. Straight rack; 59. Alignment assembly; 591. Sliding sleeve; 592. Second servo motor; 593. Drive sleeve; 594. Splined shaft; 595. Second gear; 596. Spring seat; 597. Second spring; 598. Arc rack; 599. Sliding plate; 5910. Arc groove; 510. Connecting rod; 511. Triangular block; 512. Support plate; 513. First spring; 514. Telescopic rod; 6. Electric slider. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 8The automatic bolt tightening device for diesel engines includes a base 1. A vertical electric slide rail module 2 is fixedly connected to one side of the top of the base 1. A longitudinal electric slide rail module 3 is slidably connected to the outer surface of the vertical electric slide rail module 2. A transverse electric slide rail module 4 is slidably connected inside the longitudinal electric slide rail module 3. An electric slider 6 is slidably connected inside the transverse electric slide rail module 4. A torsion component 5 for automatically tightening bolts is provided at the bottom of the electric slider 6.

[0024] like Figure 2 - Figure 4 As shown, the torsion assembly 5 includes a fixed plate 51 fixed to the bottom of the electric slider 6. A drive motor 52 is fixedly connected to the middle of the bottom of the fixed plate 51. A disc 54 is fixedly connected to the output end of the drive motor 52. A nut 53 is rotatably connected to the top edge of the disc 54. A screw 57 is threadedly connected to the inside of the nut 53. Connecting rods 510 are fixedly connected to both sides of the bottom of the fixed plate 51. A ring 55 is fixedly connected to the bottom of the two connecting rods 510. A cylinder 56 is rotatably connected to the inner surface of the ring 55. A support plate 512 is fixedly connected to the top of the inner surface of the cylinder 56. A telescopic rod 514 is slidably connected inside the support plate 512. A triangular block 511 is fixedly connected to the top of the telescopic rod 514. A first spring 513 is sleeved on the outer surface of the telescopic rod 514. An alignment assembly 59 is connected to the bottom of the inner cylinder 56. A tightening assembly 58 is provided on the alignment assembly 59.

[0025] The first spring 513 is located between the support plate 512 and the triangular block 511. The bottom of the screw 57 penetrates the interior of the disk 54, and the screw 57 and the disk 54 slide against each other.

[0026] When tightening the bolt, the tightening assembly 58 is fitted onto the outer surface of the bolt. The drive motor 52 is activated, causing the disc 54 to rotate. The disc 54 then rotates the screw 57. The moving screw 57 contacts the hypotenuse of the triangular block 511, which impedes its movement. This causes the screw 57 to rotate synchronously with the cylinder 56 via the triangular block 511. The cylinder 56, through the alignment assembly 59, drives the tightening assembly 58 to tighten the bolt. As the bolt tightens, the contact force between the screw 57 and the hypotenuse of the triangular block 511 increases. When the bolt is fully tightened, the bolt... As the screw continues to rotate, the cylinder 56 will stop rotating. At this time, the drive motor 52 will continue to rotate, and the contact force between the screw 57 and the triangular block 511 will gradually increase. When the force in the vertical direction is greater than the deformation force of the first spring 513, the triangular block 511 will move downward, and the screw 57 will continue to slide on the hypotenuse of the triangular block 511. This allows the screw 57 to pass through the triangular block 511, which not only ensures that the drive motor 52 will not get stuck and damaged after tightening the bolt, but also avoids stripping due to excessive torque, thus preventing damage to the equipment, reducing thread damage, and extending the service life of the bolt. Depending on the size of the bolt and the actual situation, different numbers of screws 57 can be selected for operation. The more screws 57 that are in operation, the greater the torque force generated, and vice versa. By rotating the nut 53, the screws 57 are driven to move upward through the action of the thread, so that the screws 57 gradually leave the inside of the cylinder 56. When rotating, the screws 57 will not contact the triangular block 511, so that the screws 57 are in an idle state, thereby reducing the torque force.

[0027] like Figure 5 - Figure 6 As shown, the tightening assembly 58 includes a bucket-shaped cylinder 581 fixed on the alignment assembly 59. Hydraulic rods 585 are symmetrically fixedly connected to the middle of the inner surface of the bucket-shaped cylinder 581. A rack 589 is fixedly connected to the output end of the hydraulic rod 585. A first servo motor 582 is fixedly connected to the top of the inner surface of the bucket-shaped cylinder 581. A first gear 584 is fixedly connected to the outer surface of the output end of the first servo motor 582. A rotating disk 586 is fixedly connected to the output end of the first servo motor 582. Two drive grooves 587 are evenly opened inside the rotating disk 586. Six tightening blocks 583 are slidably connected to the bottom of the inner surface of the bucket-shaped cylinder 581. A drive rod 588 is fixedly connected to the top of the tightening block 583. The top of the drive rod 588 extends into the interior of the drive groove 587.

[0028] The bottom of the tightening block 583 is provided with an inclined chamfer near the center of the bucket-shaped cylinder 581, and one side of the tightening block 583 extends out of the interior of the bucket-shaped cylinder 581.

[0029] The rack 589 and the first gear 584 are at the same horizontal height. The first gear 584 is located between the two racks 589, and the racks 589 and the first gear 584 mesh with each other.

[0030] The top of the first servo motor 582 is fixedly connected to a horizontal plate, and the two sides of the horizontal plate are fixedly connected to the inner surface of the bucket-shaped cylinder 581.

[0031] When tightening bolts on a diesel engine, different bolt sizes and models require different sized sleeves, making the operation cumbersome and inconvenient. Therefore, when tightening bolts of different specifications, the distance between multiple tightening blocks 583 is adjusted according to the bolt size. The hydraulic rod 585 is opened via the terminal to move the rack 589 away from the first gear 584, disengaging them. Then, the first servo motor 582 is activated, rotating the rotating disk 586. The rotation of the rotating disk 586 drives the drive... The moving rod 588 slides inside the drive groove 587, causing the drive rod 588 to gradually move away from the center of the rotating disk 586. This drives multiple tightening blocks 583 to slide inside the bucket-shaped cylinder 581 and move away from each other. After adjustment, the hydraulic rod 585 is activated to drive the rack 589 to move towards the first gear 584, so that the rack 589 and the first gear 584 mesh with each other, fixing the first gear 584 and the rotating disk 586, ensuring the stability of the tightening blocks 583. This reduces the need to replace different sleeves and reduces unnecessary disassembly and assembly operations.

[0032] like Figure 7 - Figure 8 As shown, the alignment assembly 59 includes a sliding sleeve 591 that slides on the bottom of the inner surface of the cylinder 56, a spring seat 596 that is axially fixed on the bottom of the inner surface of the cylinder 56, and a drive component that is axially fixed on the middle of the inner surface of the cylinder 56. A second spring 597 is fixedly connected to the bottom of the spring seat 596. An arc-shaped groove 5910 is axially symmetrically opened on the bottom of the inner surface of the sliding sleeve 591. A sliding plate 599 is slidably connected inside the arc-shaped groove 5910. The bottom of the sliding sleeve 591 is fixedly connected to the top of the bucket-shaped cylinder 581.

[0033] The driving component includes a second servo motor 592 that is axially symmetrically fixed at the middle of the inner surface of the cylinder 56 and an arc-shaped rack 598 that is axially symmetrically fixed to the top of the inner surface of the sliding sleeve 591. The output end of the second servo motor 592 is fixedly connected to a driving sleeve 593. A spline shaft 594 is slidably connected inside the driving sleeve 593. A second gear 595 is fixedly connected to the outer surface of the spline shaft 594.

[0034] The second gear 595 meshes with the arc-shaped rack 598, and a connecting plate is provided at the bottom of the spline shaft 594, with one side of the connecting plate being fixedly connected to the inner surface of the sliding sleeve 591.

[0035] The bottom of the second spring 597 is fixedly connected to the top of the sliding plate 599. The sliding plate 599 slides inside the arc groove 5910. An arc groove is provided in the middle of the inside of the cylinder 56. A connecting arc plate is provided on the outer surface of the sliding sleeve 591. The connecting arc plate slides inside the arc groove.

[0036] When the bolt is rotated, the bucket-shaped cylinder 581 is fitted onto the bolt, but this does not necessarily ensure that the bolt falls precisely between the six tightening blocks 583. A misalignment occurs between the bolt and the six tightening blocks 583. In this case, when the bucket-shaped cylinder 581 moves towards the bolt, it cannot engage, and the tightening blocks 583 cannot effectively contact the side of the bolt. Therefore, after the tightening blocks 583 contact one end of the bolt, the two spur racks 589 are activated, driving the drive sleeve 593 to rotate in both directions. The drive sleeve 593, through the splined shaft 594, drives the second gear 595 to rotate in both directions. Through the transmission of the arc-shaped rack 598, the sliding sleeve 591 continuously rotates in both directions inside the cylinder 56, while the sliding plate 599 slides relative to it inside the arc-shaped groove 5910. The cylinder 56 moves closer to the bolt while the sliding sleeve 591 can no longer move. The cylinder 56 compresses the second spring 597 through the spring seat 596, causing the cylinder 56 and the sliding sleeve 591 to slide relative to each other. When the space formed by the six tightening blocks 583 coincides with the bolt, the second spring 597 pushes the sliding sleeve 591 toward the bolt, causing the bucket-shaped cylinder 581 and the tightening blocks 583 to move and put the six tightening blocks 583 around the bolt. At this time, the drive motor 52 can be started to drive the bucket-shaped cylinder 581 to rotate, and the bolt is rotated and tightened by the six tightening blocks 583. Thus, the six tightening blocks 583 can be quickly put on the bolt before tightening, achieving precise positioning.

[0037] Instructions for use: When tightening bolts of different sizes, adjust the distance between multiple tightening blocks 583 according to the bolt size. Open the hydraulic rod 585 via the terminal to move the rack 589 away from the first gear 584, disengaging them. Then, turn on the first servo motor 582 to rotate. The first servo motor 582 drives the rotating disk 586 to rotate. The rotation of the rotating disk 586 causes the drive rod 588 to slide inside the drive groove 587, gradually moving the drive rod 588 away from the center of the rotating disk 586, thus driving the multiple tightening blocks 583... 83 slides inside the bucket-shaped cylinder 581 and moves away from each other. After adjustment, the hydraulic rod 585 is activated to drive the rack 589 to move towards the first gear 584, so that the rack 589 and the first gear 584 mesh with each other, fixing the first gear 584 and the rotating disk 586, ensuring the stability of the tightening block 583. Through the cooperation of the longitudinal electric slide rail module 3, the transverse electric slide rail module 4 and the torsion component 5, the bucket-shaped cylinder 581 is moved to the top of the bolt and close to the bolt, so that the bottom of the tightening block 583 contacts the top of the bolt. During this period, the two spur racks 589 are activated, driving the drive sleeve 593 to rotate in both directions. The drive sleeve 593 drives the second gear 595 to rotate in both directions via the spline shaft 594. Through the transmission of the arc-shaped rack 598, the sliding sleeve 591 rotates continuously in both directions inside the cylinder 56, while the sliding plate 599 slides relative to each other inside the arc-shaped groove 5910. Through transmission, multiple tightening blocks 583 rotate back and forth continuously. At the same time, the cylinder 56 continuously moves closer to the bolt, while the sliding sleeve 591 can no longer move. Thus, the cylinder 56, through the spring seat 596, controls the bolt. The second spring 597 is compressed, causing the cylinder 56 and the sliding sleeve 591 to slide relative to each other. When the space enclosed by the six tightening blocks 583 completely coincides with the bolt, the second spring 597 will push the sliding sleeve 591 towards the bolt, causing the bucket-shaped cylinder 581 and the tightening blocks 583 to move and put the six tightening blocks 583 around the bolt. At this time, the drive motor 52 can be started to drive the bucket-shaped cylinder 581 to rotate, and the bolt will be rotated and tightened by the six tightening blocks 583. Thus, the six tightening blocks 583 can be quickly put on the bolt before tightening the bolt, achieving precise positioning. The drive motor 52 is turned on, causing the disc 54 to rotate. The disc 54 then drives the screw 57 to rotate. The moving screw 57 contacts the hypotenuse of the triangular block 511, which impedes the movement of the screw 57. This causes the screw 57 to drive the cylinder 56 to rotate synchronously via the triangular block 511. The cylinder 56, through the alignment component 59, drives the tightening component 58 to tighten the bolt. As the bolt tightens, the contact force between the screw 57 and the hypotenuse of the triangular block 511 increases. When the bolt is fully tightened, the cylinder 56 stops rotating. At this time, the drive motor 52 will continue to rotate, and the contact force between the screw 57 and the triangular block 511 will gradually increase. When the force in the vertical direction is greater than the deformation force of the first spring 513, the triangular block 511 will move downward, and the screw 57 will continue to slide on the hypotenuse of the triangular block 511. This allows the screw 57 to pass through the triangular block 511, which not only ensures that the drive motor 52 will not get stuck and damaged after tightening the bolt, but also avoids stripping due to excessive torque, thus preventing damage to the equipment, reducing thread damage, and extending the service life of the bolt.

[0038] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An automatic tightening device for diesel engine connecting bolts, including a base (1), a vertical electric slide rail module (2) is fixedly connected to one side of the top of the base (1), a longitudinal electric slide rail module (3) is slidably connected to the outer surface of the vertical electric slide rail module (2), a transverse electric slide rail module (4) is slidably connected to the inside of the longitudinal electric slide rail module (3), and an electric slider (6) is slidably connected to the inside of the transverse electric slide rail module (4). Its features are: The bottom of the electric slider (6) is provided with a torsion assembly (5) for automatically tightening bolts. The torsion assembly (5) includes a fixed plate (51) fixed to the bottom of the electric slider (6). A drive motor (52) is fixedly connected to the middle of the bottom of the fixed plate (51). A disc (54) is fixedly connected to the output end of the drive motor (52). A nut (53) is rotatably connected to the top edge of the disc (54). A screw (57) is threaded into the nut (53). Connecting rods (510) are fixedly connected to both sides of the bottom of the fixed plate (51). The bottoms of the two connecting rods (510) are fixedly connected to... A circular ring (55) is rotatably connected to a cylinder (56) on its inner surface. A support plate (512) is fixedly connected to the top of the inner surface of the cylinder (56). A telescopic rod (514) is slidably connected inside the support plate (512). A triangular block (511) is fixedly connected to the top of the telescopic rod (514). A first spring (513) is sleeved on the outer surface of the telescopic rod (514). An alignment component (59) is connected to the bottom of the inner surface of the cylinder (56). A tightening component (58) is provided on the alignment component (59). The first spring (513) is located between the support plate (512) and the triangular block (511). The bottom of the screw (57) penetrates the interior of the disc (54). The screw (57) and the disc (54) slide against each other. When the bolt is tightened, the tightening assembly (58) is sleeved on the outer surface of the bolt. The disc (54) is rotated by turning on the drive motor (52). The disc (54) drives the screw (57) to rotate. The moving screw (57) contacts the hypotenuse of the triangular block (511) to provide torque. The tightening assembly (58) includes a bucket-shaped cylinder (581) fixed on the alignment assembly (59). The alignment assembly (59) includes a sliding sleeve (591) that slides on the bottom of the inner surface of the cylinder (56), a spring seat (596) that is axially symmetrically fixed on the bottom of the inner surface of the cylinder (56), and a driving component that is axially symmetrically fixed at the middle of the inner surface of the cylinder (56). A second spring (597) is fixedly connected to the bottom of the spring seat (596). An arc groove (5910) is axially symmetrically opened on the bottom of the inner surface of the sliding sleeve (591). A sliding plate (599) is slidably connected inside the arc groove (5910). The bottom of the sliding sleeve (591) is fixedly connected to the top of the bucket-shaped cylinder (581). The driving component includes a second servo motor (592) fixed axially symmetrically at the middle of the inner surface of the cylinder (56) and an arc-shaped rack (598) fixedly axially symmetrically connected to the top of the inner surface of the sliding sleeve (591). The output end of the second servo motor (592) is fixedly connected to a driving sleeve (593). A spline shaft (594) is slidably connected inside the driving sleeve (593), and a second gear (595) is fixedly connected to the outer surface of the spline shaft (594). The second gear (595) meshes with the arc-shaped rack (598), and a connecting plate is provided at the bottom of the spline shaft (594), and one side of the connecting plate is fixedly connected to the inner surface of the sliding sleeve (591). The bottom of the second spring (597) is fixedly connected to the top of the sliding plate (599). The sliding plate (599) slides inside the arc groove (5910). An arc groove is provided in the middle of the inside of the cylinder (56). A connecting arc plate is provided on the outer surface of the sliding sleeve (591). The connecting arc plate slides inside the arc groove.

2. The automatic tightening device for diesel engine connecting bolts according to claim 1, characterized in that: Hydraulic rods (585) are symmetrically fixedly connected to the middle of the inner surface of the bucket-shaped cylinder (581). A rack (589) is fixedly connected to the output end of the hydraulic rod (585). A first servo motor (582) is fixedly connected to the top of the inner surface of the bucket-shaped cylinder (581). A first gear (584) is fixedly connected to the outer surface of the output end of the first servo motor (582). A rotating disk (586) is fixedly connected to the output end of the first servo motor (582). Two drive slots (587) are evenly opened inside the rotating disk (586). Six tightening blocks (583) are slidably connected to the bottom of the inner surface of the bucket-shaped cylinder (581). A drive rod (588) is fixedly connected to the top of the tightening block (583). The top of the drive rod (588) extends into the interior of the drive slot (587).

3. The automatic tightening device for diesel engine connecting bolts according to claim 2, characterized in that: The bottom of the tightening block (583) is provided with an inclined chamfer near the center of the bucket-shaped cylinder (581), and one side of the tightening block (583) extends out of the interior of the bucket-shaped cylinder (581).

4. The automatic tightening device for diesel engine connecting bolts according to claim 3, characterized in that: The rack (589) and the first gear (584) are at the same horizontal height, the first gear (584) is located between the two racks (589), and the rack (589) and the first gear (584) mesh with each other.

5. The automatic tightening device for diesel engine connecting bolts according to claim 4, characterized in that: The first servo motor (582) has a horizontal plate fixedly connected to its top, and the two sides of the horizontal plate are fixedly connected to the inner surface of the bucket-shaped cylinder (581).

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