Automatic bolt tightening device for engine assembly

Abstract

The invention relates to the technical field of engine assembling devices, in particular to an automatic bolt tightening device for engine assembling, which comprises a workbench and further comprises a fixing mechanism, the fixing mechanism comprises a fixing disc rotatably connected to the workbench, the fixing disc is in clamping fit with a to-be-processed engine, and the fixing disc is connected with the workbench in a rotating mode. The bottom of the fixed disc rotationally communicates with an air suction base. The transferring mechanism is used for realizing feeding and discharging of the engine on the fixed disc; and tightening the detection mechanism. The functions of engine automatic feeding, discharging, bolt position positioning, bolt tightening, torque rechecking and tightening stability enhancing are integrated, full-process automation is achieved, manual intervention is reduced, and the production efficiency and the product quality stability are improved; through the combination of the corrugated pipe, the magnetic fluid and the coil, the connection rigidity is changed according to the tightening stage, buffering is formed when bolts are in butt joint, and additional rigid connection is provided when the bolts are tightened.

Description

Technical Field

[0001] The present invention relates to the technical field of engine assembly devices, and in particular to an automatic bolt tightening device for engine assembly. Background Art

[0002] In the modern engine manufacturing industry, bolt tightening is a core step in engine assembly. The precision, stability, and degree of automation of its operation play a decisive role in the overall quality, performance, and production efficiency of the engine. With the increasing demand for engine performance in the automotive, aerospace, and other fields, the need for optimization and innovation in engine bolt tightening technology and corresponding devices is becoming increasingly urgent. Traditional engine bolt tightening devices, due to irregular workpiece installation positions and high installation torque, are difficult to achieve precise positioning and stable fixation, resulting in substandard tightening quality.

[0003] In the existing technology, the position of the tightening shaft is adjusted by multiple mechanisms to achieve automatic tightening of various flywheel bolts and improve efficiency. In this method, the engine automatic feeding, discharging and torque re-inspection functions are not integrated, and the torque transmission capacity is poor. A trolley is used to carry a test bench and a secondary positioning fixture is used to fix the engine. In this method, when fixing the engine, the vibration of the engine cannot be reduced and the stability of tightening the bolts cannot be improved. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art that the engine automatic feeding, discharging and torque rechecking functions are not integrated and the torque transmission capability is poor, and an automatic bolt tightening device for engine assembly is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An automatic bolt tightening device for engine assembly, comprising a workbench and:

[0007] A fixing mechanism, comprising a fixing plate rotatably connected to the workbench, the fixing plate being engaged with the engine to be processed, and a bottom of the fixing plate being rotatably connected to an air suction base;

[0008] A transfer mechanism, which is used to realize feeding and unloading of the engine on the fixed plate;

[0009] The tightening detection mechanism includes an adjustment component connected to the workbench, the output end of the adjustment component is connected to two mounting brackets, which are used to drive the two mounting brackets to move in the vertical plane. A driving device is installed on each of the two mounting brackets. A sleeve is clamped at the output end of one driving device, and a transmission component is connected to the inside of the sleeve. The top of the transmission component is connected to the output end of the driving device and the bottom end is clamped with a tightening head. A re-tester is installed at the output end of the other driving device.

[0010] Preferably, a fixed frame is fixedly connected to the workbench, the air suction base is installed on the top of the fixed frame, a shifter is installed on the workbench, and a plurality of teeth are provided on the outer side of the fixed disk. When the shifter is working, the fixed disk is rotated by the teeth.

[0011] Preferably, a mounting groove is coaxially opened in the middle of the fixed plate, and a plurality of telescopic rods are installed at the bottom of the mounting groove. The output ends of the plurality of telescopic rods are fixedly connected to the same lifting platform, and the lifting platform is slidably connected to the inside of the mounting groove. A card block is fixedly connected to the top of the lifting platform, and the card block is engaged with the bottom of the engine.

[0012] Preferably, the transfer mechanism includes a movable frame arranged on both sides of the workbench and pushing rollers rotatably installed at the four corners of the workbench. A movable device is rotatably installed at the bottom of the movable frame. The output end of the movable device is rotatably connected to a movable wheel group. The movable wheel group is rotatably connected to a wheel frame. The wheel frame is slidably connected to the movable frame. The movable device is used to adjust the height and angle of the movable wheel group. When the two movable wheel groups and the four pushing rollers are working, the push engine moves from one movable wheel group to the fixed disk and from the fixed disk to another movable wheel group.

[0013] Preferably, the adjustment assembly includes a mounting plate fixedly connected to the workbench, a telescopic motor is installed on the mounting plate, two sliding rods are fixedly connected to the telescopic motor, the output end of the telescopic motor is fixedly connected to a movable plate, the movable plate is slidably connected to the two sliding rods, a rotatable driving gear is connected to the movable plate, the top and bottom of the driving gear are meshed with rack plates, the rack plate is slidably connected to the movable plate, and the two rack plates are fixedly connected to the two mounting frames in a one-to-one correspondence.

[0014] Preferably, a visual sensor is installed in the middle of the movable plate through a bracket, and the visual sensor is used to locate the bolt position of the engine.

[0015] Preferably, the transmission assembly includes a drive shaft slidably connected to the inside of the sleeve, a bellows is fixedly connected between the top end of the drive shaft and the output end of the drive device, and a connecting block is clamped at the bottom end. The interior of the bellows is filled with magnetic fluid and a coil is wound around the outside. When the coil is energized, a magnetic field is generated to change the magnetic fluid from liquid to solid. The bottom end of the connecting block is clamped into engagement with the tightening head.

[0016] Preferably, a bevel notch is provided on the side of the connecting block, and an axial hole for the connecting block to engage is provided at the bottom of the drive shaft. A hole groove is connected to the side of the axial hole, and a screw is threadedly connected inside the hole groove, and the end of the screw rests against the inside of the bevel notch.

[0017] Preferably, the cross sections of the connecting block and the shaft hole are both square, and the normal direction of the inclined surface of the inclined surface notch faces downward.

[0018] Preferably, a first auxiliary arm and a second auxiliary arm are fixedly connected to the two mounting frames respectively, and the sleeve and the re-inspector are located between the two auxiliary arms. The bottom end of the first auxiliary arm rests against the side of the sleeve, and the bottom end of the second auxiliary arm is sleeved on the outside of the re-inspector.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1. The present invention integrates the functions of automatic engine feeding, discharging, bolt position positioning, bolt tightening, torque re-inspection and enhanced tightening stability by setting a fixing mechanism, a transfer mechanism and a tightening detection mechanism, thereby realizing full process automation, reducing manual intervention, and improving production efficiency and product quality stability; the tightening detection mechanism changes the connection rigidity according to the tightening stage through a combination of bellows, magnetic fluid and coil, forms a buffer when docking bolts, avoids damage to the device caused by vibration caused by docking errors, provides additional rigid connection when tightening bolts, improves the overall ability of the device to withstand high torque, and ensures stable torque transmission; at the same time, the inclined notch of the connecting block cooperates with the screw of the drive shaft to ensure reliable connection, and when the connecting block and the drive shaft undergo axial relative movement, the screw moves along the inclined surface of the inclined notch, effectively avoiding direct breakage of the screw and clogging in the hole groove and the inclined notch, and convenient disassembly and assembly of the connecting block and the drive shaft in case of accidents.

[0021] 2. The present invention sets a fixing mechanism and a tightening detection mechanism. The fixing mechanism drives the engine to rotate through a rotatable fixing disk. The adjustment component in the tightening detection mechanism drives the tightening head and the re-tester to move in the vertical plane. Combined with the visual sensor, the position of the tightening head and the re-tester is accurately controlled to achieve precise tightening and detection. The tightening head and the re-tester move synchronously in opposite directions on the left and right through the rotation of the fixing disk, thereby improving efficiency and accuracy when cross-tightening the bolts on the engine.

[0022] 3. The present invention sets a fixing mechanism, cooperates with the air suction base and the fixing plate, utilizes the Bernoulli principle to fix the engine by jet, and combines the telescopic rod in the middle of the fixing plate and the lifting platform to clamp the bottom of the engine. It is not only fixed stably, but also can flexibly adjust the position of the engine to adapt to the tightening operation, and can also reduce the vibration of the engine during tightening, thereby improving the stability of tightening the bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an overall axonometric view of an automatic bolt tightening device for engine assembly proposed by the present invention.

[0024] Figure 2 This is a schematic structural diagram of a fixed plate and a pushing roller of an automatic bolt tightening device for engine assembly proposed by the present invention.

[0025] Figure 3 This is a structural schematic diagram of a sliding rod and a telescopic motor of an automatic bolt tightening device for engine assembly proposed by the present invention.

[0026] Figure 4 This is a schematic structural diagram of a driving gear and rack plate of an automatic bolt tightening device for engine assembly proposed by the present invention.

[0027] Figure 5 This is a schematic structural diagram of a toggle mechanism and a fixing frame of an automatic bolt tightening device for engine assembly proposed by the present invention.

[0028] Figure 6 This is a schematic structural diagram of a telescopic rod and air suction base of an automatic bolt tightening device for engine assembly proposed by the present invention.

[0029] Figure 7 This is a schematic diagram of the half-section structure of a tightening head and sleeve of an automatic bolt tightening device for engine assembly proposed by the present invention.

[0030] In the figure: 1 moving frame, 2 moving device, 3 moving wheel group, 4 workbench, 5 fixed plate, 6 pushing roller, 7 mounting plate, 8 moving plate, 9 sliding rod, 10 telescopic motor, 11 rack plate, 12 driving gear, 13 first auxiliary arm, 14 second auxiliary arm, 15 re-inspector, 16 visual sensor, 17 driving device, 18 sleeve, 19 tightening head, 20 connecting block, 21 inclined notch, 22 driving shaft, 23 bellows, 24 coil, 25 fixed frame, 26 air suction base, 27 toggle, 28 telescopic rod. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1 、 Figure 5 and Figure 6 , an automatic bolt tightening device for engine assembly, comprising a workbench 4, and further comprising:

[0033] The fixing mechanism includes a fixing plate 5 rotatably connected to the workbench 4. The fixing plate 5 is engaged with the engine to be processed. The bottom of the fixing plate 5 is rotatably connected to the air suction base 26. The air suction base 26 sprays air to the outside through the gap between the fixing plate 5 and the engine.

[0034] A fixed frame 25 is fixedly connected to the workbench 4, and an air suction base 26 is installed on the top of the fixed frame 25. A toggle 27 is installed on the workbench 4. A plurality of teeth are provided on the outside of the fixed disk 5. When the toggle 27 is working, the fixed disk 5 is rotated by the teeth.

[0035] The air suction base 26 and the toggle 27 both adopt existing technology. When the air suction base 26 is working, it inflates the air holes at the corresponding positions on the fixed plate 5, so that the air flow is blown outward from the gap between the fixed plate 5 and the engine through the air holes, thereby improving the fixing effect of the engine through the action of air pressure.

[0036] When the toggle 27 is working, its output end toggles the teeth on the outside of the fixed plate 5, so that the fixed plate 5 rotates on the workbench 4, which is convenient for driving the engine to rotate and cooperates with the subsequent structure to complete the tightening work of the bolts at different positions on the engine.

[0037] A mounting groove is coaxially opened in the middle of the fixed plate 5, and multiple telescopic rods 28 are installed at the bottom of the mounting groove. The output ends of the multiple telescopic rods 28 are fixedly connected to the same lifting platform, and the lifting platform is slidably connected to the inside of the mounting groove. A card block is fixedly connected to the top of the lifting platform, and the card block is engaged with the bottom of the engine.

[0038] The transfer mechanism is used to realize the feeding and discharging of the engine on the fixed plate 5.

[0039] The transfer mechanism includes a moving frame 1 arranged on both sides of the workbench 4, and pushing rollers 6 rotatably installed at the four corners of the workbench 4. A moving device 2 is rotatably installed at the bottom of the moving frame 1. The output end of the moving device 2 is rotatably connected to a moving wheel group 3. The moving wheel group 3 is rotatably connected to a wheel frame. The wheel frame is slidably connected to the moving frame 1. The moving device 2 is used to adjust the height and angle of the moving wheel group 3. When the two moving wheel groups 3 and the four pushing rollers 6 are working, the push engine moves from one moving wheel group 3 to the fixed disk 5, and from the fixed disk 5 to another moving wheel group 3.

[0040] The moving device 2 adopts the hydraulic rod in the prior art. When the output end of the hydraulic rod is extended, it pushes the moving wheel group 3 and the wheel frame to move upward along the moving frame 1. When the wheel frame moves upward to the extreme position, the output end of the hydraulic rod continues to extend, pushing the moving wheel group 3 to rotate, thereby completing the adjustment of the height and angle of the moving wheel group 3.

[0041] The moving wheel group 3 and the pushing roller 6 adopt the existing technology, and the engine placed thereon is pushed to move by the rotation of the moving wheel and the roller, thereby completing the feeding and discharging operations of the engine.

[0042] Reference Figure 2-Figure 4 , the tightening detection mechanism includes an adjustment component connected to the workbench 4, the output end of the adjustment component is connected to two mounting brackets, which are used to drive the two mounting brackets to move in the vertical plane, and a driving device 17 is installed on each of the two mounting brackets. A sleeve 18 is clamped on the output end of one driving device 17, and a transmission component is connected inside the sleeve 18. The top of the transmission component is connected to the output end of the driving device 17, and the bottom end is clamped with a tightening head 19. The output end of the other driving device 17 is installed with a re-tester 15.

[0043] The retest device 15 adopts the existing technology and has a torque detection function. When the retest head twists the bolt, the torque is detected and the data is recorded to complete the retest operation.

[0044] The adjustment assembly includes a mounting plate 7 fixedly connected to the workbench 4, a telescopic motor 10 is installed on the mounting plate 7, and two sliding rods 9 are fixedly connected to the telescopic motor 10. The output end of the telescopic motor 10 is fixedly connected to a movable plate 8, and the movable plate 8 is slidably connected to the two sliding rods 9. A rotatable driving gear 12 is connected to the movable plate 8, and the top and bottom of the driving gear 12 are meshed with rack plates 11. The rack plate 11 is slidably connected to the movable plate 8, and the two rack plates 11 are fixedly connected to the two mounting frames in a one-to-one correspondence.

[0045] A visual sensor 16 is mounted on the middle portion of the movable plate 8 via a bracket. The visual sensor 16 is used to locate the bolt positions of the engine.

[0046] The visual sensor 16 adopts existing technology and compares the position of the bolts on the engine with the image data to improve the accuracy of the tightening head 19 and the re-inspector 15 in sleeve connection of the bolts.

[0047] Reference Figure 7 The transmission assembly includes a drive shaft 22 that is slidably connected to the inside of the sleeve 18. A bellows 23 is fixedly connected between the top of the drive shaft 22 and the output end of the drive device 17, and a connecting block 20 is clamped at the bottom end. The inside of the bellows 23 is filled with magnetic fluid and a coil 24 is wound around the outside. When the coil 24 is energized, a magnetic field is generated to change the magnetic fluid from liquid to solid. The bottom end of the connecting block 20 is clamped with the tightening head 19.

[0048] Magnetic fluid is formed by nano-scale magnetic particles uniformly dispersed in a carrier liquid. Under the action of a magnetic field, its rheological properties and fluidity change significantly, transforming from liquid to solid.

[0049] A bevel notch 21 is provided on the side of the connecting block 20 , and an axial hole for the connecting block 20 to be snapped into is provided at the bottom of the driving shaft 22 . A hole groove is connected to the side of the axial hole, and a screw is threadedly connected inside the hole groove, and the end of the screw rests against the inside of the bevel notch 21 .

[0050] The cross sections of the connecting block 20 and the shaft hole are both square, and the normal direction of the inclined surface of the inclined surface notch 21 faces downward.

[0051] When the tightening head 19 tightens the bolt, the torque of the connecting block 20 and the drive shaft 22 increases, and the inclined notch 21 and the screw form a limiting effect, thereby increasing the resistance to relative rotation of the connecting block 20 and the drive shaft 22 and ensuring the transmission effect.

[0052] The first auxiliary arm 13 and the second auxiliary arm 14 are fixedly connected to the two mounting frames respectively. The sleeve 18 and the re-inspector 15 are located between the two auxiliary arms. The bottom end of the first auxiliary arm 13 rests on the side of the sleeve 18, and the bottom end of the second auxiliary arm 14 is sleeved on the outside of the re-inspector 15.

[0053] When the present invention is in use, the movable frames 1 on the left and right sides of the workbench 4 adjust the height position and inclination angle of the movable wheel group 3 through the movable device 2 at the bottom. The movable wheel group 3 works and cooperates with the pushing rollers 6 at the four corners of the workbench 4 to push the engine to be processed from one movable wheel group 3 to the fixed plate 5 to realize the feeding operation, and moves from the fixed plate 5 to another movable wheel group 3 to realize the discharging operation.

[0054] Under the rolling action of the moving wheel group 3 and the pushing roller 6, the engine is moved to the fixed plate 5, and the multiple telescopic rods 28 on the fixed plate 5 work, and their output ends drive the lifting platform to rise, and the lifting platform drives the block to move upward, so that the block fits with the bottom of the engine casing, thereby improving the fixing effect of the engine; at the same time, the lifting platform continues to rise and fall under control, which is convenient for tightening the bolts on the engine.

[0055] When the fixed disk 5 needs to rotate, the toggle 27 works, and its output end drives the fixed disk 5 to rotate by toggling the outer teeth of the fixed disk 5, thereby driving the engine to rotate, which facilitates the tightening of the bolts on the engine.

[0056] Next, according to the position of the bolts on the engine, the telescopic motor 10 installed behind the mounting plate 7 is controlled to work, and its output end drives the movable plate 8 to move vertically on the two sliding rods 9 to adjust the up and down positions of the tightening head 19 and the re-inspector 15; the driving gear 12 is controlled to rotate, driving the two rack plates 11 to move left and right, controlling the two mounting frames and the driving device 17 to move left and right, and adjusting the left and right positions of the tightening head 19 and the re-inspector 15 to facilitate alignment of the bolts on the engine.

[0057] The visual sensor 16 in the middle of the movable plate 8 works to locate the bolt position of the engine.

[0058] After the block on the lifting platform matches the engine casing, the air suction base 26 at the bottom of the fixed plate 5 is started. There are air holes at specific positions on the surface of the fixed plate 5. The air suction base 26 inflates the air into the air holes, and the air flow blows outward from the gap between the fixed plate 5 and the engine through the air holes. Due to the Bernoulli principle, a downward pulling force is formed on the engine, which fixes the engine more stably on the fixed plate 5, reduces the vibration of the engine during the subsequent tightening of the bolts, and improves the stability during operation.

[0059] When the tightening head 19 is aligned with the bolt on the engine, the telescopic motor 10 works, driving the tightening head 19 to move downward and sleeve onto the bolt. The driving device 17 works, and its output end drives the sleeve 18 to rotate. The sleeve 18 drives the drive shaft 22 to rotate. The drive shaft 22 rotates and drives the tightening head 19 to rotate through the connecting block 20, thereby tightening the bolt.

[0060] The tightening head 19 is connected to the drive shaft 22 through the connecting block 20. An inclined notch 21 is provided on the middle side of the connecting block 20. The inclined notch 21 is aligned with the screw on the connecting block 20. The screw and the inclined notch 21 cooperate to suppress the tendency of the connecting block 20 to slide downward inside the shaft hole; at the same time, when the connecting block 20 and the drive shaft 22 undergo axial relative movement, the screw moves along the inclined surface of the inclined notch 21, effectively avoiding the screw from directly breaking and clogging in the hole groove and the inclined notch 21, making it convenient to disassemble and assemble the connecting block 20 and the drive shaft 22 in the event of an accident.

[0061] A bellows 23 is provided between the upper end of the drive shaft 22 and the output end of the drive device 17. The interior of the bellows 23 is filled with magnetic fluid, and a coil 24 is surrounded by the outside of the bellows 23. When the tightening head 19 moves downward to contact the bolt, the coil 24 is not energized and the magnetic fluid is in liquid state, which makes the bellows 23 have a certain deformation ability, forming a buffer when the tightening head 19 docks the bolt, effectively avoiding the vibration caused by the docking error from causing damage to the device.

[0062] When the tightening head 19 tightens the bolt, the coil 24 is energized. When the coil 24 is energized, a magnetic field is generated to change the magnetic fluid from liquid to solid, so that the bellows 23 is rigidly connected to the output end of the drive device 17 and the drive shaft 22, and cooperates with the rigid transmission of the sleeve 18 to improve the overall ability of the device to withstand high torque.

[0063] After tightening the bolt, the fixed disk 5 rotates in a controlled manner, and the re-test device 15 is aligned with the tightened bolt to re-test the torque of the bolt, automatically compare it with the preset value and record the deviation.

[0064] A first auxiliary arm 13 and a second auxiliary arm 14 are respectively provided on both sides of the tightening head 19 and the re-checker 15. When tightening high-torque bolts, the tightening tool will generate a huge reaction torque, which has a tendency to cause the entire tightening unit to twist or shift. The first auxiliary arm 13 and the second auxiliary arm 14 provide additional support points for the tightening head 19 and the re-checker 15, which effectively resists this torsional tendency, improves the rigidity of the entire tightening unit, and reduces elastic deformation.

[0065] Secondly, the additional support points significantly shorten the effective cantilever length of the tightening unit, enhancing the ability to resist lateral forces and bending moments.

[0066] During the tightening process, especially impact tightening or when the target torque is reached, vibration will be generated. Additional support points and rigid connections help absorb and dissipate vibration energy and protect the device from damage.

[0067] Finally, when the tightening head 19 is inserted into the bolt head, or when subjected to non-axial interference forces during the tightening process, the additional support points can help resist lateral slippage or jumping, ensuring that the sleeve 18 always maintains the correct engagement state with the bolt, helping to prevent the corners of the bolt from being rounded.

[0068] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An automatic bolt tightening device for engine assembly, comprising a workbench (4), characterized in that: Also includes: A fixing mechanism, the fixing mechanism comprising a fixing plate (5) rotatably connected to a workbench (4), the fixing plate (5) being engaged with the engine to be processed, and a bottom of the fixing plate (5) being rotatably connected to an air suction base (26); A transfer mechanism, the transfer mechanism being used to realize feeding and discharging of the engine on the fixed plate (5); A tightening detection mechanism comprises an adjustment component connected to a workbench (4); an output end of the adjustment component is connected to two mounting frames for driving the two mounting frames to move in a vertical plane; a driving device (17) is installed on each of the two mounting frames; an output end of one driving device (17) is clamped with a sleeve (18); a transmission component is connected inside the sleeve (18); a top end of the transmission component is connected to the output end of the driving device (17) and a tightening head (19) is clamped at the bottom end; and a retest device (15) is installed at the output end of the other driving device (17).

2. The automatic bolt tightening device for engine assembly according to claim 1, characterized in that: A fixed frame (25) is fixedly connected to the workbench (4), the air suction base (26) is installed on the top of the fixed frame (25), and a toggle (27) is installed on the workbench (4). A plurality of latching teeth are provided on the outer side of the fixed disk (5). When the toggle (27) is in operation, the fixed disk (5) is rotated by the latching teeth.

3. The automatic bolt tightening device for engine assembly according to claim 2, characterized in that: A mounting groove is coaxially provided in the middle of the fixing plate (5), and a plurality of telescopic rods (28) are installed at the bottom of the mounting groove. The output ends of the plurality of telescopic rods (28) are fixedly connected to the same lifting platform, and the lifting platform is slidably connected to the inside of the mounting groove. A clamping block is fixedly connected to the top of the lifting platform, and the clamping block is engaged with the bottom of the engine.

4. The automatic bolt tightening device for engine assembly according to claim 1, characterized in that: The transfer mechanism comprises a moving frame (1) arranged on both sides of a workbench (4), and a pushing roller (6) rotatably mounted at the four corners of the workbench (4); a moving device (2) is rotatably mounted on the bottom of the moving frame (1); an output end of the moving device (2) is rotatably connected to a moving wheel group (3); the moving wheel group (3) is rotatably connected to a wheel frame; the wheel frame is slidably connected to the moving frame (1); the moving device (2) is used to adjust the height and angle of the moving wheel group (3); when the two moving wheel groups (3) and the four pushing rollers (6) are in operation, the driving engine moves from one moving wheel group (3) to a fixed disk (5), and from the fixed disk (5) to another moving wheel group (3).

5. The automatic bolt tightening device for engine assembly according to claim 1, characterized in that: The adjustment assembly comprises a mounting plate (7) fixedly connected to the workbench (4); a telescopic motor (10) is mounted on the mounting plate (7); two sliding rods (9) are fixedly connected to the mounting plate (7); an output end of the telescopic motor (10) is fixedly connected to a moving plate (8); the moving plate (8) is slidably connected to the two sliding rods (9); a rotatable driving gear (12) is connected to the moving plate (8); the top and bottom of the driving gear (12) are both meshed with rack plates (11); the rack plate (11) is slidably connected to the moving plate (8); and the two rack plates (11) are fixedly connected to the two mounting frames in a one-to-one correspondence.

6. The automatic bolt tightening device for engine assembly according to claim 5, characterized in that: A visual sensor (16) is installed in the middle of the movable plate (8) via a bracket, and the visual sensor (16) is used to locate the bolt position of the engine.

7. The automatic bolt tightening device for engine assembly according to claim 1, characterized in that: The transmission assembly comprises a drive shaft (22) slidably connected to the interior of a sleeve (18); a bellows (23) is fixedly connected between the top end of the drive shaft (22) and the output end of the drive device (17); and a connecting block (20) is clamped at the bottom end. The interior of the bellows (23) is filled with magnetic fluid, and a coil (24) is wound around the outside. When the coil (24) is energized, a magnetic field is generated to change the magnetic fluid from liquid to solid. The bottom end of the connecting block (20) is clamped and matched with a tightening head (19).

8. The automatic bolt tightening device for engine assembly according to claim 7, characterized in that: The side of the connecting block (20) is provided with an inclined notch (21), and the bottom of the driving shaft (22) is provided with an axial hole for the connecting block (20) to be snap-fitted. The side of the axial hole is connected with a hole groove, and a screw is threadedly connected inside the hole groove, and the end of the screw rests on the inside of the inclined notch (21).

9. The automatic bolt tightening device for engine assembly according to claim 8, characterized in that: The cross sections of the connecting block (20) and the axial hole are both square, and the normal direction of the inclined surface of the inclined surface notch (21) faces downward.

10. The automatic bolt tightening device for engine assembly according to claim 1, characterized in that: A first auxiliary arm (13) and a second auxiliary arm (14) are fixedly connected to the two mounting frames respectively. The sleeve (18) and the re-inspector (15) are both located between the two auxiliary arms. The bottom end of the first auxiliary arm (13) abuts against the side of the sleeve (18), and the bottom end of the second auxiliary arm (14) is sleeved on the outside of the re-inspector (15).

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