Automatic nut tightening device

Abstract

The invention relates to the technical field of mechanical assembly, and discloses an automatic nut tightening device which comprises an upper supporting seat, the lower end of the upper supporting seat is connected with an L-shaped connecting seat, a first conveyor is horizontally arranged in the L-shaped connecting seat in a penetrating mode, and the first conveyor is used for transferring hexagon bolts; a lifting driving seat is downwards arranged in the middle of the interior of the upper supporting seat, a limiting shell is fixedly connected to the lower end of the lifting driving seat, a nut tightening gun set is movably arranged in the limiting shell, and a rotating seat is downwards rotationally arranged in the nut tightening gun set. The cam is driven by the cam shaft to do circular motion, the protruding part interacts with the contact wheel in the motion process to generate extrusion force to cause the swing arm to slightly swing downwards, the nut sleeve rod slightly inclines downwards, meanwhile, the bending spring is compressed in the swing process of the swing arm to generate a vibration effect, and therefore the nut sleeve rod is driven to rotate. And the group of lifting ring nut pieces on the outermost side on the nut loop bar is caused to slide down.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical assembly, and particularly relates to an automatic nut tightening device. Background Art

[0002] A lifting ring nut is a fastening part, usually composed of a nut and a lifting ring welded together. It is mainly used to tightly connect mechanical equipment and is widely used in power equipment (such as the hoisting and installation of heavy equipment like transformers and generators), port machinery (lifting goods), the steel and shipbuilding industries. The main function of the lifting ring nut is to cooperate with a bolt through the internal thread to achieve a fastening effect. Its installation method is flexible and diverse, with the advantages of being detachable and anti-torsion. The material of the lifting ring nut is usually selected as stainless steel, such as materials like 304, 201, 316, etc. These materials are not only corrosion-resistant but also have strong load-bearing capacity, and are particularly suitable for occasions requiring high-strength fixation. A nut tightening device is generally used during the workshop assembly of lifting ring nuts.

[0003] Existing nut tightening devices have many technical defects during use. First, the automation degree of feeding nuts and bolts is low, and the positioning is not accurate enough, resulting in a high assembly error rate. Second, the inside of the lifting ring nut is likely to be contaminated with dust and debris during production and transportation, which is likely to cause wear of the thread during use. Third, nuts or bolts need to be lubricated before assembly to avoid jamming during screwing. Currently, it is generally done by manual oil dripping. On the one hand, this is time-consuming and laborious with low work efficiency. On the other hand, the amount of oil dripping cannot be accurately controlled, and oil pollution is likely to occur during the transportation of the lifting ring nut.

[0004] In summary, considering that the existing facilities cannot meet the working requirements, for this reason, we propose an automatic nut tightening device. Summary of the Invention

[0005] The main purpose of the present invention is to provide an automatic nut tightening device, which can effectively solve the problems in the background art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: An automatic nut tightening device includes an upper support seat. The lower end of the upper support seat is connected with an L-shaped connecting seat. A first conveyor is horizontally penetrated through the inside of the L-shaped connecting seat. The inside of the first conveyor includes a conveyor belt, and the conveyor belt is used for transporting hexagonal bolts. An elevating drive seat is arranged downward at the middle position inside the upper support seat. The lower end of the elevating drive seat is fixedly connected with a limiting housing. A nut tightening gun group is movably arranged inside the limiting housing. A rotating seat is rotatably arranged downward inside the nut tightening gun group, and a clamping outer seat is riveted to the lower end of the rotating seat.

[0007] As a preferred solution of the automatic nut tightening device described in the present invention, the following is provided: A clamping cylinder is vertically installed inside the rotating seat. A cylinder rod extends from the inside of the clamping cylinder into the inside of the clamping outer seat. A trapezoidal seat is fixed to the lower end of the cylinder rod. First sliders are symmetrically installed at the middle positions on both side faces of the trapezoidal seat.

[0008] As a preferred solution of the automatic nut tightening device described in the present invention, the following is provided: A rotating motor set is provided at the lower end of the limit housing. A rotating shaft extends downward from the inside of the rotating motor set. An opening tooling seat for positioning a hexagonal bolt is welded to the lower end of the rotating shaft. The opening tooling seat is slightly higher than the conveyor belt.

[0009] As a preferred solution of the automatic nut tightening device described in the present invention, the following is provided: A positioning plane that fits the bolt part of the hexagonal bolt is provided on the inner end face of the opening tooling seat. Receiving grooves are symmetrically formed on both inner side faces of the opening tooling seat. The receiving grooves are used to receive folding angle clips. Both groups of folding angle clips act on the nut seat part of the hexagonal bolt. The folding angle clips are fixed by the horizontal ends of welding blocks and first hydraulic rods. The first hydraulic rods extend horizontally outward from the inside of the first hydraulic cylinders. The first hydraulic cylinders are located inside the opening tooling seat.

[0010] As a preferred solution of the automatic nut tightening device described in the present invention, the following is provided: Moving seats are symmetrically and movably arranged on both sides of the trapezoidal seat inside the clamping outer seat. The number of moving seats is 2 groups. Inner clamping grooves for the movement of the first sliders are formed at the middle positions on the inner side faces of the moving seats. The lower end of each group of moving seats is welded with an adjusting clamping seat through a guiding block. The adjusting clamping seat extends out of the lower end face of the clamping outer seat. A retaining piece is riveted at the bottom corner of the adjusting clamping seat. Upper curved columns are provided at the upper positions on the inner side faces of both groups of adjusting clamping seats. First clamping grooves are formed inside the upper curved columns. The first clamping grooves act on the hanging ring parts of the hanging ring nut parts. Second clamping grooves are formed at the lower positions on the inner side faces of the adjusting clamping seats. The second clamping grooves act on the nut parts of the hanging ring nut parts.

[0011] As a preferred embodiment of the automatic nut tightening device of the present invention, the following is provided: at the middle position of the lower end face of the limit housing, there is a screw outlet, inside which two sets of sealing doors are symmetrically and movably arranged. On the side faces of the two sets of sealing doors, there are symmetrically fixed second sliders. On the screw outlet, there is a horizontal track acting on the second sliders. At the docking area of the upper end faces of the two sets of sealing doors, there are guiding slopes. At the bottom of the guiding slopes, there is an elastic support plate acting on the eye nut part. After being pressed, the elastic support plate flips downward. Inside the sealing door and below the elastic support plate, there is a blanking gap. On the upper end face of each set of sealing doors, there is a first hinge groove. On the outer side face of the nut tightening gun group, there are symmetrically opened second hinge grooves. The first hinge groove and the second hinge groove are connected by a connecting rod, and the number of connecting rods is 2 groups.

[0012] As a preferred embodiment of the automatic nut tightening device of the present invention, the following is provided: at the front end face of the limit housing, there is a blanking inclined seat. Inside the blanking inclined seat, there is a torsion channel communicating with the inside of the limit housing. On the upper end face of the torsion channel, there is a feeding single port fitting the eye nut part. On the upper end face of the blanking inclined seat and on one side of the feeding single port, there is a curved guiding plate welded. Outside the blanking inclined seat, there is a limit circular seat. Inside the limit circular seat, there is a limit circular groove opening upward. Inside the limit circular groove, there is an eye nut feeding table rotatably arranged.

[0013] As a preferred embodiment of the automatic nut tightening device of the present invention, the following is provided: inside the limit circular groove, there is a sliding step acting on the eye nut feeding table. At the middle position of the lower end face of the eye nut feeding table, there is a driving roller vertically welded. The position between the driving roller and the sliding step is connected by a damping bearing sleeve. The end of the driving roller passing through the damping bearing sleeve is sleeved with a sprocket wheel. On the wheel surface of the sprocket wheel, there are evenly opened gap wheel grooves, and the number of gap wheel grooves is preferably 4 - 6 groups. Inside the sliding step, there is a first servo motor vertically fixed downward. On the motor shaft of the first servo motor, there is a crank disk welded. At the lower end face of the crank disk, there is a driving column rotatably arranged. During the movement of the driving column, it extends into one of the gap wheel grooves.

[0014] As a preferred embodiment of the automatic nut tightening device of the present invention, the following is provided: A swinging groove is evenly formed around the outer side of the lifting ring nut feeding table. A swinging arm is arranged in the swinging groove. The number of the swinging grooves and the swinging arms is preferably 4-6 groups. Short shafts are symmetrically welded on both sides of the swinging arm. The short shafts are fixed to the groove wall of the swinging groove through the first bearing seats. A contact wheel groove is formed at the lower end of the swinging arm. A contact wheel is rotatably arranged in the contact wheel groove. A cam is attached to the lower end of the contact wheel. The cam is sleeved on a camshaft. Both ends of the camshaft are fixed to the inside of the lifting ring nut feeding table through the second bearing seats. One end of the camshaft extends outwards and is connected to a second servo motor through a coupling. The second servo motor is fixed inside the lifting ring nut feeding table.

[0015] As a preferred embodiment of the automatic nut tightening device of the present invention, the following is provided: A spring storage sleeve is formed on the upper end surface of the swinging arm. A bending spring is installed in the spring storage sleeve. The upper end of the bending spring is fixed to the top of the swinging groove. One end of the swinging arm extending out of the swinging groove is fixed with a nut sleeve rod. A number of lifting ring nut parts are sleeved on the nut sleeve rod. A curved material blocking groove acting on the nut sleeve rod is formed at the bottom of the lifting drive seat and above the blanking inclined seat. An air blowing channel is horizontally formed at a lower position inside the nut sleeve rod. Blowing holes communicating with the air blowing channel are equidistantly formed at the top of the nut sleeve rod. The number of the blowing holes is preferably 4-8 groups. The blowing holes act on the nut parts of the corresponding lifting ring nut parts. The end of the air blowing channel is connected with a supply air hose. Each group of supply air hoses extends inwards and is connected to the exhaust port of the air storage tank. An electromagnetic pulse valve is arranged at the exhaust port. The air storage tank extends upwards from the inside of the lifting ring nut feeding table.

[0016] As a preferred embodiment of the automatic nut tightening device of the present invention, the following is provided: A second hydraulic cylinder is arranged on the horizontal left side of one of the first hydraulic cylinders. Oil pipes are connected to the rear ends of the first hydraulic cylinder and the second hydraulic cylinder. Both groups of oil pipes are connected to an oil changing seat. A control oil pump is installed in the oil changing seat. A second hydraulic rod is horizontally and movably arranged to extend outwards from the inside of the second hydraulic cylinder. A wheel seat is fixed to the end of the second hydraulic rod. A deviation correcting wheel is rotatably arranged in the wheel seat. A part of the deviation correcting wheel extends out of the wheel seat and acts on the nut seat part of the hexagonal bolt.

[0017] As a preferred solution of the automatic nut tightening device described in the present invention, wherein: a sealing wheel shell is fixed inside the two groups of adjusting clamp seats, an oil dripping wheel is fitted inside the sealing wheel shell, a plurality of groups of oil dripping holes are evenly opened on the wheel surface of the oil dripping wheel, and the number of the oil dripping holes is preferably 10-20 groups, a rotating rod is splined in the middle of the oil dripping wheel, an inner bearing is installed at the contact position between the rotating rod and the sealing wheel shell, one end of the rotating rod is fixed by a damping bearing and the inner wall of the adjusting clamp seat, the other end of the rotating rod is sleeved with a driving wheel, ratchets are evenly distributed on the wheel surface of the driving wheel, a braking structure is provided at the lower end of the ratchets, an oil dripping capillary is connected obliquely below the sealing wheel shell, and the oil dripping capillary extends out of the outer side surface of the adjusting clamp seat to act on the nut part of the lifting ring nut.

[0018] As a preferred scheme of the automatic nut tightening device described in the present invention, the braking structure comprises an intermediate platform, a longitudinal sliding groove, a top block, a fixing plate, a pressure plate, a brake shaft, a fitting surface, a return spring and a guide column, wherein the intermediate platform is provided with a longitudinal sliding groove running through the inside of the intermediate platform, and a top block is movably arranged in the longitudinal sliding groove, and the upper end of the top block extends into the gap between adjacent ratchet teeth, and the lower end of the top block is fitted with a pressure plate, and the pressure plate is screwed into the inside of the adjusting clamp seat through the fixing plate, and the pressure plate is screwed into the inside of the adjusting clamp seat through the fixing plate, and a brake shaft is welded at one end of the intermediate platform, and the brake shaft extends out of the outside of the shaft groove, and the shaft groove is arranged in the upper position in the second clamping groove, and the end of the brake shaft is provided with a fitting surface in contact with the outer side surface of the nut part of the lifting ring nut, and a guide column is welded at the other end of the intermediate platform, and a guide seat for inserting the guide column is horizontally arranged inside the adjusting clamp seat, and a return spring sleeved on the outside of the guide column is fixed between the guide seat and the intermediate platform.

[0019] As a preferred solution of the automatic nut tightening device described in the present invention, the limiting round seat is fixed to the bottom of the L-shaped connecting seat through supporting legs.

[0020] As a preferred solution of the automatic nut tightening device described in the present invention, the area where the first conveyor is located in the open tooling seat is not provided with a side baffle.

[0021] As a preferred solution of the automatic nut tightening device described in the present invention, the eye nut is screwed onto the hexagonal bolt to form a connecting piece.

[0022] As a preferred solution of the automatic nut tightening device described in the present invention, the connecting rod drives the sealing door to move linearly in the screw outlet when swinging.

[0023] As a preferred solution of the automatic nut tightening device described in the present invention, the nut tightening gun assembly includes a gun housing, a tightening gun and a torque sensor.

[0024] As a preferred embodiment of the automatic nut tightening device of the present invention, wherein: an air compressor is provided at the top of the air storage tank.

[0025] As a preferred embodiment of the automatic nut tightening device of the present invention, wherein: symmetric limiting ports for the movement of the guiding blocks are respectively formed on the lower end surface of the clamping outer seat.

[0026] As a preferred embodiment of the automatic nut tightening device of the present invention, wherein: the lower end of the torsion channel is located obliquely above the guiding slope.

[0027] As a preferred embodiment of the automatic nut tightening device of the present invention, wherein: the nut sleeve rod is normally in a slightly inclined upward state.

[0028] As a preferred embodiment of the automatic nut tightening device of the present invention, wherein: an oil injection pipe is communicated with the upper end of the sealing wheel housing, and an oil storage hopper is provided at the upper end of the oil injection pipe.

[0029] As a preferred embodiment of the automatic nut tightening device of the present invention, wherein: an oil-proof pad is provided around the inner wall of the sealing wheel housing.

[0030] The present invention provides an automatic nut tightening device through improvement. Compared with the prior art, it has the following significant improvements and advantages: Start the control oil pump to let the oil pipe of the second hydraulic cylinder be filled with oil. The second hydraulic rod extends, driving the deviation rectifying wheel to contact the corner of the screw seat, slightly pushing the hexagon bolt, and cooperating with the power of the conveyor belt to automatically adjust the position to achieve the purpose of automatic deviation rectification. At this time, start the control oil pump again to pump part of the hydraulic oil of the second hydraulic cylinder into the first hydraulic cylinder. While the second hydraulic rod retracts, the first hydraulic rod extends, and the two groups of folding angle clips move towards each other simultaneously to clamp and fix the hexagon bolt to achieve the purpose of automatic positioning. The two groups of hydraulic cylinders form a linkage, with flexible adjustment and high automation.

[0031] The nut sleeve rod at the front end hooks the hanging ring part of the hanging ring nut part, causing the hanging ring nut part to slide inwards on the inclined nut sleeve rod to achieve the purpose of automatic material collection. Start the second servo motor, the camshaft drives the cam to do circular motion, and the protruding part acts on the contact wheel during the movement, generating an extrusion force to cause the swing arm to swing slightly downwards, making the nut sleeve rod slightly inclined downwards. At the same time, the bending spring is compressed during the swing of the swing arm, generating a vibration effect, causing the outermost group of hanging ring nut parts on the nut sleeve rod to slide down, contact the curved guiding plate, and enter the torsion channel through guiding from the feeding single port to achieve the function of automatic feeding. The feeding is more accurate and the automation degree is high.

[0032] With the power of the downward movement of the nut tightening gun set, the clamped ring nut part first exerts a force on the two groups of elastic support plates, causing them to open downward, allowing the ring nut part to enter the blanking gap, which serves as a buffer area. Then, during the downward movement of the nut tightening gun set, by using the movement of the two groups of connecting rods, the two groups of sealing doors are respectively pushed to move linearly within the screw outlet, slowly opening the sealing doors, with high linkage, achieving the purpose of automatic discharging.

[0033] The outer side of the nut part will extend into the second clamping groove and squeeze the brake shaft, causing it to retract into the shaft groove, resulting in the linear inward movement of the intermediate platform and the top block. When the top block contacts the ratchet teeth, a force is generated to push the driving wheel to rotate a certain angle around the damping bearing, thereby causing the oil dripping wheel to rotate accordingly, aligning a set of adjacent oil drip holes with the upper end of the oil dripping capillary. The lubricating oil inside the oil drip holes flows into the oil dripping capillary through the flow and then flows downward along the oil dripping capillary, dripping from the lower end of the oil dripping capillary onto the inner wall of the nut part, achieving the purpose of automatic lubrication, saving time and effort, and precisely controlling the amount of lubricating oil dropped, solving the problems of oil pollution and air drying. Brief Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the overall structure of an automatic nut tightening device of the present invention in one direction; Figure 2 It is a schematic diagram of the overall structure of an automatic nut tightening device of the present invention in another direction; Figure 3 It is a schematic diagram of the internal structure of the limit housing of the present invention; Figure 4 It is a schematic diagram of the external structure of the clamping outer seat of the present invention; Figure 5 It is a schematic diagram of the internal structure of the clamping outer seat of the present invention; Figure 6 It is a schematic diagram of the external structure of the limit housing of the present invention; Figure 7 It is a schematic diagram of the external structure of the ring nut feeding table of the present invention; Figure 8 It is a schematic diagram of the internal driving structure of the limit circular seat of the present invention; Figure 9 It is a schematic diagram of the external structure of the swing arm of the present invention; Figure 10 It is a cross-sectional view of the nut sleeve rod of the present invention; Figure 11 It is a schematic diagram of the internal structure of the opening tooling seat of the present invention; Figure 12 It is a connection diagram of the first hydraulic cylinder and the second hydraulic cylinder of the present invention; Figure 13 It is a schematic diagram of the external structure of the adjusting clamp seat in the second embodiment of the present invention; Figure 14 Schematic diagram of the internal structure of the adjusting clamp seat in the second embodiment of the present invention; Figure 15 Schematic diagram of the specific structure of the braking structure of the present invention; Figure 16 Schematic diagram of the internal structure of the sealing wheel housing of the present invention.

[0035] In the figure: 1. Upper support seat; 2. L-shaped connecting seat; 3. First conveyor; 4. Conveyor belt; 5. Hexagonal bolt; 6. Ring nut part; 7. Connector; 10. Lifting drive seat; 11. Limit housing; 12. Nut tightening gun set; 13. Rotating seat; 14. Clamping outer seat; 15. Clamping cylinder; 16. Cylinder rod; 17. Trapezoidal seat; 18. First slider; 20. Moving seat; 21. Inner card slot; 22. Guide block; 23. Adjusting clamp seat; 24. Limit port; 25. Flap; 26. Upper curved column; 27. First clamping groove; 28. Second clamping groove; 30. Sealing door; 31. Second slider; 32. Guide slope; 33. Elastic support plate; 34. Feeding gap; 35. First hinge groove; 36. Second hinge groove; 37. Connecting rod; 40. Feeding inclined seat; 41. Single feeding port; 42. Curved guide plate; 43. Curved material retaining groove; 44. Limit round seat; 45. Limit round groove; 46. Ring nut feeding table; 47. Slide step; 50. Driving roller; 51. Damping bearing sleeve; 52. Groove wheel; 53. Clearance wheel groove; 54. First servo motor; 55. Crank disk; 56. Driving column; 60. Air storage tank; 61. Swing arm; 611. Contact wheel; 612. Cam; 613. Camshaft; 614. Second bearing seat; 615. Second servo motor; 62. Short shaft; 63. First bearing seat; 64. Nut sleeve rod; 65. Spring storage sleeve; 66. Bending spring; 67. Air supply hose; 68. Blowing channel; 69. Blowing ash hole; 70. Rotating motor set; 71. Rotating shaft; 72. Open tooling seat; 73. Positioning plane; 74. No. 1 hydraulic cylinder; 75. First hydraulic rod; 76. Welding block; 77. Angle folding clip; 781. No. 2 hydraulic cylinder; 782. Second hydraulic rod; 783. Wheel seat; 784. Deviation correcting wheel; 785. Oil pipe; 786. Oil changing seat; 787. Control oil pump; 80. Sealing wheel housing; 81. Oil dripping wheel; 82. Oil drip hole; 83. Rotating rod; 84. Inner bearing; 85. Damping bearing; 86. Driving wheel; 87. Spur teeth; 88. Oil dripping capillary; 89. Braking structure; 891. Intermediate table; 892. Longitudinal chute; 893. Top block; 894. Fixed piece; 895. Pressing piece; 896. Braking shaft; 897. Fitting surface; 898. Return spring; 899. Guide post; 90. Leg; 91. Screw outlet; 92. Swing groove; 93. Storage groove; 94. Shaft groove; 95. Oil injection pipe; 96. Oil storage hopper. Detailed implementation mode

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0037] As Figure 1-12 shown, this embodiment provides an automatic nut tightening device, including an upper support seat 1. A lower end of the upper support seat 1 is connected to an L-shaped connecting seat 2, and the L-shaped connecting seat 2 plays a role of supporting and positioning. A first conveyor 3 is horizontally penetrated through the inside of the L-shaped connecting seat 2. The inside of the first conveyor 3 includes a conveyor belt 4, and the conveyor belt 4 moves linearly from left to right. The conveyor belt 4 is used to transport hexagonal bolts 5. A hexagonal nut seat is arranged at the bottom of the hexagonal bolt 5. A lifting drive seat 10 is arranged downward at the middle position inside the upper support seat 1, and a limiting housing 11 is fixedly connected to the lower end of the lifting drive seat 10.

[0038] Among them, a blanking inclined seat 40 is connected to the front end face of the limiting housing 11. A twisting channel communicating with the inside of the limiting housing 11 is opened inside the blanking inclined seat 40. The shape of the twisting channel fits the shape of the eye nut part 6 (it can be twisted up to 90°). A feeding single port 41 fitting the eye nut part 6 is opened on the upper end face of the twisting channel. A curved guide plate 42 is welded on the upper end face of the blanking inclined seat 40 and on one side of the feeding single port 41 (the actual position and length of the curved guide plate 42 are determined according to the falling path of the eye nut part 6). The eye nut part 6 can slide along the curved surface of the curved guide plate 42, as Figure 1 、 2 shown in 6.

[0039] Furthermore, a limiting circular seat 44 is arranged outside the blanking inclined seat 40. The limiting circular seat 44 is fixed to the bottom of the L-shaped connecting seat 2 through a leg 90, and the leg 90 plays a supporting role. A limiting circular groove 45 is opened upward inside the limiting circular seat 44, and an eye nut feeding table 46 is rotatably arranged in the limiting circular groove 45, as Figure 1 、 2 shown in 7.

[0040] Specifically, a sliding step 47 acting on the lifting ring nut feeding table 46 is riveted inside the limiting circular groove 45. The lifting ring nut feeding table 46 and the sliding step 47 move relative to each other. The sliding step 47 plays a supporting role. A driving roller 50 is vertically welded at the middle position of the lower end face of the lifting ring nut feeding table 46. The position between the driving roller 50 and the sliding step 47 is connected by a damping bearing sleeve 51. The damping bearing sleeve 51 has a certain damping force. A grooved pulley 52 is sleeved on the end of the driving roller 50 passing through the damping bearing sleeve 51, as Figure 7 and 8 shown.

[0041] Among them, gap grooves 53 are evenly formed on the wheel surface of the grooved pulley 52. A first servo motor 54 is vertically fixed downward inside the sliding step 47. A crank disk 55 is welded on the motor shaft of the first servo motor 54. A driving column 56 is rotatably arranged on the lower end face of the crank disk 55. The driving column 56 extends into one group of the gap grooves 53 during movement, as Figure 8 shown.

[0042] Furthermore, swing grooves 92 are evenly formed on the outer side surface of the lifting ring nut feeding table 46. Swing arms 61 are arranged in the swing grooves 92. Short shafts 62 are symmetrically welded on both sides of the swing arms 61. The short shafts 62 are fixed to the groove walls of the swing grooves 92 through first bearing seats 63, as Figure 7 、 9 and 10 shown.

[0043] Among them, a contact wheel groove is formed at the lower end of the swing arm 61. A contact wheel 611 is rotatably arranged in the contact wheel groove. A part of the contact wheel 611 extends out of the contact wheel groove. A cam 612 is attached to the lower end of the contact wheel 611, as Figure 9 and 10 shown.

[0044] In this embodiment, the cam 612 is sleeved on a camshaft 613. Both ends of the camshaft 613 are fixed inside the lifting ring nut feeding table 46 through second bearing seats 614. One end of the camshaft 613 extends outward and is connected to a second servo motor 615 through a coupling. The second servo motor 615 is fixed inside the lifting ring nut feeding table 46, as Figure 9 and 10 shown.

[0045] Among them, a spring receiving sleeve 65 is formed on the upper end face of the swing arm 61. A bending spring 66 is installed in the spring receiving sleeve 65. The bending spring 66 has a certain vibration frequency. The bending spring 66 is used to maintain the mutual acting force between the contact wheel 611 and the cam 612. The upper end of the bending spring 66 is fixed to the top of the swing groove 92, as Figure 9 and 10 shown.

[0046] Among them, a nut sleeve rod 64 is fixed to one end of the swing arm 61 extending out of the swing groove 92. A plurality of groups of ring nut parts 6 are sleeved on the nut sleeve rod 64. Under normal circumstances, the nut sleeve rod 64 is in a slightly inclined upward state. A curved material blocking groove 43 acting on the nut sleeve rod 64 is provided at the bottom of the lifting drive seat 10 and above the blanking inclined seat 40, which plays a role in blocking materials, as Figure 6-9 shown.

[0047] Among them, a blowing channel 68 is horizontally provided at a lower position inside the nut sleeve rod 64. Blowing holes 69 communicating with the blowing channel 68 are equidistantly provided at the top of the nut sleeve rod 64. The blowing holes 69 act on the nut parts of the corresponding ring nut parts 6. One end of the blowing channel 68 is connected with a gas supply hose 67. The gas supply hose 67 can be displaced along with the movement of the swing arm 61. Each group of gas supply hoses 67 extends inward and is connected to the exhaust port of the air storage tank 60. An electromagnetic pulse valve is installed at each exhaust port. The air storage tank 60 extends upward from the inside of the ring nut feeding table 46. An air compressor is provided at the top of the air storage tank 60, which plays a role in compressing air, as Figure 9 and 10 shown.

[0048] Furthermore, a nut tightening gun group 12 is movably arranged inside the limiting housing 11. The nut tightening gun group 12 includes a gun shell, a tightening gun and a torque sensor. A rotating seat 13 is rotatably arranged downward inside the nut tightening gun group 12. A clamping outer seat 14 is riveted to the lower end of the rotating seat 13. A clamping cylinder 15 is vertically installed inside the rotating seat 13, as Figure 3 and 4 shown.

[0049] Specifically, a cylinder rod 16 extends from the inside of the clamping cylinder 15 to the inside of the clamping outer seat 14. A trapezoidal seat 17 is fixed to the lower end of the cylinder rod 16. First sliders 18 are symmetrically installed at the middle positions of both side surfaces of the trapezoidal seat 17. The cross section of the first slider 18 is an inverted trapezoid, which has the function of limiting sliding, as Figure 5 shown.

[0050] Among them, moving seats 20 are symmetrically and movably arranged inside the clamping outer seat 14 on both sides of the trapezoidal seat 17. Inner clamping grooves 21 for the movement of the first sliders 18 are provided at the middle positions of the inner side surfaces of the moving seats 20. The contact surfaces between them are smooth and the movement resistance is small. The lower end of each group of moving seats 20 is welded with an adjusting clamp seat 23 through a guiding block 22. Limiting ports 24 for the movement of the guiding blocks 22 are symmetrically provided on the lower end surface of the clamping outer seat 14, which plays a role in limiting and guiding. The adjusting clamp seat 23 extends out of the lower end surface of the clamping outer seat 14, as Figure 3-5 shown.

[0051] Among them, a retaining piece 25 is riveted at the bottom corner of the adjusting clamp seat 23. The retaining piece 25 limits the position of the ring nut part 6 on the elastic support plate 33. Upper curved columns 26 are arranged at the upper positions of the inner sides of the two groups of adjusting clamp seats 23. A first clamping groove 27 is formed inside the upper curved column 26. The first clamping groove 27 acts on the ring part of the ring nut part 6. A second clamping groove 28 is formed at the lower position of the inner side of the adjusting clamp seat 23. The second clamping groove 28 acts on the nut part of the ring nut part 6. The clamping grooves at the upper and lower positions can further increase the clamping force on the ring nut part 6, as Figure 3-5 shown.

[0052] Furthermore, a screw outlet 91 is formed at the middle position of the lower end face of the limiting housing 11. Two groups of sealing doors 30 are symmetrically and movably arranged inside the screw outlet 91. Second sliders 31 are symmetrically fixed to the side faces of the two groups of sealing doors 30. A horizontal track acting on the second sliders 31 is formed on the screw outlet 91. The second sliders 31 move linearly along the horizontal track, as Figure 1-5 shown.

[0053] Among them, guiding slopes 32 are arranged at the butting areas of the upper end faces of the two groups of sealing doors 30. The lower end of the torsion channel is located obliquely above the guiding slopes 32. An elastic support plate 33 acting on the ring nut part 6 is arranged at the bottom of the guiding slopes 32. The elastic support plate 33 turns downward under pressure and automatically resets when the pressure is removed. A blanking gap 34 is formed inside the sealing door 30 and below the elastic support plate 33. The blanking gap 34 can play a role in accommodating the ring nut part 6 at the initial stage of movement, as Figure 3 and 4 shown.

[0054] Among them, a first hinge groove 35 is formed on the upper end face of each group of sealing doors 30. Second hinge grooves 36 are symmetrically formed on the outer side faces of the nut tightening gun group 12. The first hinge groove 35 and the second hinge groove 36 are connected by a connecting rod 37. The relative positions of the two groups of hinge grooves are designed according to the actual situation. The two ends of the connecting rod 37 are hinged. The connecting rod 37 drives the sealing door 30 to move linearly inside the screw outlet 91 when swinging, as Figure 3 and 4 shown.

[0055] Furthermore, a rotating motor group 70 is arranged at the lower end of the limiting housing 11. A rotating shaft 71 extends downward inside the rotating motor group 70. An opening tooling seat 72 for positioning the hexagon bolt 5 is welded to the lower end of the rotating shaft 71. The opening tooling seat 72 is slightly higher than the conveyor belt 4. The side baffle is not arranged in the area of the first conveyor 3 where the opening tooling seat 72 is located, as Figure 6 shown.

[0056] Among them, a positioning plane 73 that fits the bolt part of the hexagonal bolt 5 is provided on the inner end surface of the open tooling seat 72, as Figure 11 and 12 shown.

[0057] Among them, receiving grooves 93 are symmetrically formed on the two inner side surfaces of the open tooling seat 72. The receiving grooves 93 are used to receive the angled clip pieces 77. The shape of the angled clip pieces 77 is designed according to the structure of the socket part of the hexagonal bolt 5. The two groups of angled clip pieces 77 both act on the socket part of the hexagonal bolt 5. The angled clip pieces 77 are fixed by the welding blocks 76 and the horizontal ends of the first hydraulic rods 75. The first hydraulic rods 75 horizontally extend outward from the inside of the first hydraulic cylinders 74. The first hydraulic cylinders 74 are located inside the open tooling seat 72, as Figure 6 、 11 and 12 shown.

[0058] Furthermore, a second hydraulic cylinder 781 is provided on the horizontal left side of one of the first hydraulic cylinders 74. The rear ends of the first hydraulic cylinder 74 and the second hydraulic cylinder 781 are both connected to oil pipes 785. The two oil pipes 785 are both connected to the oil change seat 786. A control oil pump 787 is installed inside the oil change seat 786, as Figure 11 and 12 shown.

[0059] Specifically, a second hydraulic rod 782 is horizontally and movably extended outward from the inside of the second hydraulic cylinder 781. A wheel seat 783 is fixed to the end of the second hydraulic rod 782. A deviation correction wheel 784 is rotatably arranged inside the wheel seat 783. A part of the deviation correction wheel 784 extends out of the wheel seat 783 and acts on the socket part of the hexagonal bolt 5 (at the left corner position), as Figure 11 and 12 shown.

[0060] During the use of this embodiment, the hexagonal bolt 5 moves from left to right along with the conveyor belt 4. When it enters the opening tooling seat 72, the hexagonal bolt 5 will be blocked and positioned by the positioning plane 73. At the same time, there may be a situation where the screw base of the hexagonal bolt 5 does not fit the positioning plane 73. At this time, start the control oil pump 787 to allow the oil pipe 785 of the second hydraulic cylinder 781 to be filled with oil. The second hydraulic rod 782 extends, driving the deviation-correcting wheel 784 on the wheel seat 783 to contact the edge of the screw base, slightly pushing the hexagonal bolt 5, and cooperating with the power of the conveyor belt 4 to automatically adjust its position. Repeat this several times until one side of the screw base completely fits the positioning plane 73. At this time, start the control oil pump 787 again to pump some hydraulic oil of the second hydraulic cylinder 781 into the first hydraulic cylinder 74. While the second hydraulic rod 782 retracts, the first hydraulic rod 75 extends (the first hydraulic rods 75 on the opposite side are simultaneously filled with oil and extended). The folding angle clips 77 extend out of the storage groove 93 to contact the diamond-shaped edges of the screw base. The two groups of folding angle clips 77 move towards each other simultaneously to clamp and fix the hexagonal bolt 5 in the middle, making it directly below the screw outlet 91.

[0061] During the use of this embodiment, the second conveyor continuously transports the ring nut parts 6. When the ring nut parts 6 leave the conveyor belt 4 of the second conveyor, the ring part of the ring nut parts 6 is just hooked by the nut sleeve rod 64 at the front end, causing the ring nut parts 6 to slide inward on the inclined nut sleeve rod 64 to complete the transfer of the ring nut parts 6. This process is carried out in sequence until the nut sleeve rod 64 is full of ring nut parts 6. Then, open the electromagnetic pulse valve outside this group of nut sleeve rods 64. Part of the gas in the gas storage tank 60 rushes into the blowing channel 68 through the air supply hose 67 and blows out airflows downward from several groups of ash blowing holes 69 to clean and remove impurities inside the nut parts of the ring nut parts 6 respectively.

[0062] Start the first servo motor 54 to drive the crank disk 55 to perform a circular motion. During the process that the driving column 56 on the crank disk 55 makes one full circle, it enters one of the clearance wheel grooves 53, and the two interact, causing the grooved wheel 52 to rotate a certain angle. The driving roller 50 drives the ring nut feeding table 46 to perform an intermittent motion around the limiting circular groove 45, so that another empty nut sleeve rod 64 is docked with the second conveyor, and at the same time, the nut sleeve rod 64 with the ring nut parts 6 on the opposite side is exactly located in the curved material retaining groove 43.

[0063] At this time, the second servo motor 615 on the nut sleeve rod 64 of this group is started, the camshaft 613 rotates, and drives the cam 612 to perform a circular motion. The protruding part of the cam 612 acts on the contact wheel 611 during the movement process, generating an extrusion force that causes the swing arm 61 to swing slightly downward around the two groups of first bearing seats 63, making the nut sleeve rod 64 tilt slightly downward (the end is separated from the curved material retaining groove 43). At the same time, the bending spring 66 is compressed during the swinging process of the swing arm 61, generating a vibration effect, causing the outermost group of ring nuts 6 on the nut sleeve rod 64 to slide down and fall off the nut sleeve rod 64 (subsequently, driven by the restoring force of the bending spring 66, the nut sleeve rod 64 returns to the curved material retaining groove 43 again), contacts the curved guide plate 42, and after being guided by the curved guide plate 42, enters the torsion channel from the single feed port 41. The ring nut 6 is slowly twisted at an angle while sliding down in the torsion channel (ensuring that the ring part of the ring nut 6 in place is parallel to the two groups of adjusting clamp seats 23, which is convenient for clamping the ring part), so that the ring nut 6 moving out of the torsion channel just enters the guide slope 32 and slides down from the guide slope 32 to the central position of the elastic support plate 33.

[0064] At this time, the cylinder rod 16 on the clamping cylinder 15 is retracted, driving the trapezoidal seat 17 to move upward in a straight line. Through the sliding action of the first slider 18 and the inner card slot 21, the two groups of moving seats 20 move toward each other inside the clamping outer seat 14, so that the two groups of adjusting clamp seats 23 approach each other, clamping the ring nut 6 on the elastic support plate 33, making the two groups of first clamping grooves 27 clamp the ring part of the ring nut 6, and at the same time, the two groups of second clamping grooves 28 clamp the nut part of the ring nut 6.

[0065] Then, the lifting device in the lifting drive seat 10 is operated to drive the nut tightening gun group 12 to descend. During the descending process, the clamped ring nut 6 first exerts a force on the two groups of elastic support plates 33, causing them to open downward, enabling the ring nut 6 to enter the blanking gap 34. Then, during the descending process of the nut tightening gun group 12, using the movement of the two groups of connecting rods 37, the two groups of sealing doors 30 are respectively pushed to move in a straight line in the screw outlet 91, slowly opening the sealing doors 30, so that the ring nut 6 and the clamping outer seat 14 extend out of the screw outlet 91. The ring nut 6 just contacts the hexagon bolt 5 below. At this time, the tightening gun of the nut tightening gun group 12 is operated to drive the clamping outer seat 14 to perform a spiral movement, screwing the ring nut 6 onto the hexagon bolt 5 to form the connecting piece 7.

[0066] Let the first hydraulic rod 75 drive the angled clamping piece 77 to return to its original position, so that the second hydraulic rod 782 drives the deviation-correcting wheel 784 to extend, limit a part of the connecting piece 7 in the opening tooling seat 72, start the rotating motor set 70, the rotating shaft 71 drives the opening tooling seat 72 to rotate counterclockwise by a certain angle, make the opening of the opening tooling seat 72 face right, and let the connecting piece 7 continue to be transported to the right along with the conveyor belt 4 of the first conveyor 3. Embodiment 2

[0067] On the basis of Embodiment 1, during the assembly of the eye nut part 6 and the hexagon bolt 5, due to the lack of lubrication, it is easy to cause jamming during the tightening process, resulting in assembly failure. Currently, generally, oil is manually dripped into the inside of the eye nut part 6. However, on the one hand, this is time-consuming and laborious, and on the other hand, the amount of oil dripping cannot be accurately controlled, and oil pollution is likely to occur during the transportation of the eye nut part 6. To solve the above technical problems, we have the following design, as Figure 13-16 shown.

[0068] Specifically, sealing wheel shells 80 are fixed inside two groups of adjusting clamp seats 23. An oil dripping capillary 88 is connected obliquely below the sealing wheel shell 80. The oil dripping capillary 88 extends out of the outer side surface of the adjusting clamp seat 23 and acts on the nut part of the eye nut part 6 (the lower end of the oil dripping capillary 88 is close to the inner side of the nut part but does not touch). An oil dripping wheel 81 is fitted inside the sealing wheel shell 80. An oil-proof pad is arranged around the inner wall of the sealing wheel shell 80 to play a role of sliding seal. A number of groups of oil droplet holes 82 are evenly opened on the wheel surface of the oil dripping wheel 81. The oil droplet holes 82 can only accommodate a small amount of oil droplets, as Figure 13 、 15 and 16 shown.

[0069] Among them, a rotating rod 83 is splined-connected to the middle of the oil dripping wheel 81. Inner bearings 84 are installed at the positions where the rotating rod 83 contacts the sealing wheel shell 80. One end of the rotating rod 83 is fixed to the inner wall of the adjusting clamp seat 23 through a damping bearing 85. The damping bearing 85 has a certain damping force to prevent it from rotating by itself, as Figure 14-16 shown.

[0070] Among them, a driving wheel 86 is sleeved on the other end of the rotating rod 83. Ratchet teeth 87 are evenly distributed on the wheel surface of the driving wheel 86. A braking structure 89 is arranged at the lower end of the ratchet teeth 87, as Figure 14 and 15 shown.

[0071] Specifically, the braking structure 89 includes an intermediate platform 891, a longitudinal sliding groove 892, a top block 893, a fixing piece 894, a pressing piece 895, a braking shaft 896, a fitting surface 897, a return spring 898 and a guide post 899, as Figure 14 and 15 shown.

[0072] In this embodiment, a longitudinal sliding groove 892 is formed through the interior of the intermediate platform 891. A top block 893 is movably arranged in the longitudinal sliding groove 892. The top block 893 moves vertically in the longitudinal sliding groove 892. The upper end of the top block 893 extends into the gap between adjacent ratchet teeth 87. A pressing piece 895 is attached to the lower end of the top block 893. The pressing piece 895 is screwed inside the adjusting clamp seat 23 through a fixing piece 894. The pressing piece 895 is made of spring steel and is used to maintain the contact force between the top block 893 and the driving wheel 86.

[0073] In this embodiment, a braking shaft 896 is welded to one end of the intermediate platform 891. The braking shaft 896 extends outside the shaft groove 94. The shaft groove 94 is formed at an upper position in the second clamping groove 28. A fitting surface 897 that contacts the outer side surface of the nut part of the lifting ring nut part 6 is provided at the end of the braking shaft 896. The fitting surface 897 serves to achieve full fitting.

[0074] In this embodiment, a guiding column 899 is welded to the other end of the intermediate platform 891. A guiding seat for the guiding column 899 to insert into is horizontally arranged inside the adjusting clamp seat 23. A return spring 898 sleeved outside the guiding column 899 is fixed between the guiding seat and the intermediate platform 891.

[0075] Furthermore, an oil injection pipe 95 is connected to the upper end of the sealing wheel housing 80. An oil storage hopper 96 is provided at the upper end of the oil injection pipe 95. The oil injection pipe 95 can replenish lubricating oil into the empty oil droplet holes 82, as Figure 15 shown.

[0076] Furthermore, oil collecting holes are provided on the elastic support plate 33 for collecting the grease dripping downward.

[0077] When this embodiment is in use, during the process of the two second clamping grooves 28 clamping the nut part of the lifting ring nut part 6, the outer side surface of the nut part will extend into the second clamping groove 28 and squeeze the braking shaft 896, causing it to retract into the shaft groove 94, resulting in the linear inward movement of the intermediate platform 891 and the top block 893 (meanwhile, the guiding column 899 continuously inserts into the guiding seat causing the return spring 898 to be compressed). The contact between the top block 893 and the ratchet teeth 87 generates a force to push the driving wheel 86 to rotate around the damping bearing 85 by a certain angle, so that the oil dripping wheel 81 rotates accordingly, making a set of adjacent oil droplet holes 82 dock with the upper end of the oil dripping capillary 88. The lubricating oil inside the oil droplet holes 82 flows into the oil dripping capillary 88 through flow, and flows downward along the oil dripping capillary 88, and drips from the lower end of the oil dripping capillary 88 onto the inner wall of the nut part.

[0078] After the tightening operation is completed, the eyebolt nut member 6 is separated from the second clamping groove 28, and the braking shaft 896 loses its restraint. Under the elastic force of the return spring 898, the return spring extends out of the shaft groove 94 again. The pressing piece 895 presses against the top block 893, causing the top block 893 to slide along the back surface of the multiple sets of ratchets 87 (the drive wheel 86 remains stationary without being subjected to force). As the braking shaft 896 returns to its original position, such cyclic operations are performed for oil injection.

[0079] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0080] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nut automatic tightening device, comprising an upper support seat (1), characterized in that: The lower end of the upper support seat (1) is connected to an L-shaped connection seat (2), and a first conveyor (3) is horizontally arranged inside the L-shaped connection seat (2). The first conveyor (3) includes a conveyor belt (4) inside, and the conveyor belt (4) is used to transport the hexagonal bolts (5). A lifting drive seat (10) is arranged downward in the middle position inside the upper support seat (1), and the lower end of the lifting drive seat (10) is fixedly connected to a limit housing (11), and a nut tightening gun is movably arranged inside the limit housing (11). The nut tightening gun group (12) includes a rotating seat (13) which is rotated downward inside the nut tightening gun group (12), a clamping outer seat (14) is riveted to the lower end of the rotating seat (13), a clamping cylinder (15) is vertically installed inside the rotating seat (13), a cylinder rod (16) is extended inside the clamping cylinder (15) toward the inside of the clamping outer seat (14), a trapezoidal seat (17) is fixed at the lower end of the cylinder rod (16), and a first slide block (18) is symmetrically installed at the middle position of the two side surfaces of the trapezoidal seat (17); A rotating motor group (70) is disposed at the lower end of the limiting housing (11), a rotating shaft (71) is disposed downwardly extending from the interior of the rotating motor group (70), an open tooling seat (72) for positioning the hexagonal bolt (5) is welded to the lower end of the rotating shaft (71), the open tooling seat (72) is slightly higher than the conveyor belt (4), and a positioning plane (73) is disposed on the inner end surface of the open tooling seat (72) that fits the bolt portion of the hexagonal bolt (5). 2) are symmetrically provided with receiving grooves (93) on the two inner sides, the receiving grooves (93) being used to receive angled clips (77), the two sets of angled clips (77) both acting on the screw seat of the hexagonal bolt (5), the angled clips (77) being fixed by a welding block (76) and a horizontal end of a first hydraulic rod (75), the first hydraulic rod (75) extending horizontally outward from the inside of a No. 1 hydraulic cylinder (74), the No. 1 hydraulic cylinder (74) being located inside the open tooling seat (72).

2. The automatic nut tightening device according to claim 1, characterized in that: A movable seat (20) is symmetrically arranged inside the clamping outer seat (14) and on both sides of the trapezoidal seat (17). An inner slot (21) for the first slider (18) to move is provided at the middle position of the inner side surface of the movable seat (20). An adjusting clamp seat (23) is welded to the lower end of each group of the movable seats (20) through a guide block (22). The adjusting clamp seat (23) extends out of the lower end surface of the clamping outer seat (14). A blocking piece (25) is riveted at the bottom corner of the adjusting clamp seat (23). An upper curved column (26) is provided at the upper position of the inner side surface of the two groups of the adjusting clamp seats (23). A first clamping groove (27) is provided inside the upper curved column (26). The first clamping groove (27) acts on the lifting ring portion of the lifting ring nut member (6). A second clamping groove (28) is provided at the lower position of the inner side surface of the adjusting clamp seat (23). The second clamping groove (28) acts on the nut portion of the lifting ring nut member (6).

3. The automatic nut tightening device according to claim 2, characterized in that: A screw outlet (91) is provided at the middle position of the lower end surface of the limiting housing (11), two sets of sealing doors (30) are symmetrically and movably arranged inside the screw outlet (91), second sliders (31) are symmetrically fixed to the sides of the two sets of sealing doors (30), a horizontal track acting on the second slider (31) is provided on the screw outlet (91), and a guide slope (32) is provided at the bottom of the guide slope (32) for acting on the hanging The elastic support plate (33) of the ring nut member (6) is turned downward when under pressure, and a material discharge gap (34) is provided inside the sealing door (30) and below the elastic support plate (33). The upper end surface of each group of the sealing doors (30) is provided with a first hinge groove (35), and the outer side surface of the nut tightening gun group (12) is symmetrically provided with a second hinge groove (36), and the first hinge groove (35) and the second hinge groove (36) are connected by a connecting rod (37).

4. The automatic nut tightening device according to claim 3, characterized in that: The front end face of the limiting shell (11) is connected to a material discharge inclined seat (40), the interior of the material discharge inclined seat (40) is provided with a torsion channel connected to the interior of the limiting shell (11), the upper end face of the torsion channel is provided with a single feeding port (41) matched with the lifting ring nut member (6), the upper end face of the material discharge inclined seat (40) is welded with a curved guide plate (42) on one side of the single feeding port (41), a limiting circular seat (44) is provided on the outer side of the material discharge inclined seat (40), a limiting circular groove (45) is provided upwardly inside the limiting circular seat (44), and a lifting ring nut feeding platform (46) is rotatably provided in the limiting circular groove (45).

5. The automatic nut tightening device according to claim 4, characterized in that: A sliding step (47) acting on the eye nut feeding platform (46) is riveted inside the limiting circular groove (45); a driving roller (50) is vertically welded at the middle position of the lower end surface of the eye nut feeding platform (46); the position between the driving roller (50) and the sliding step (47) is connected via a damping bearing sleeve (51); the driving roller (50) passes through the end of the damping bearing sleeve (51) and is sleeved with a groove wheel (52); the wheel surface of the groove wheel (52) is evenly provided with gap wheel grooves (53); a first servo motor (54) is vertically fixed downward inside the sliding step (47); a crank disk (55) is welded on the motor shaft of the first servo motor (54); a driving column (56) is rotatably provided on the lower end surface of the crank disk (55); the driving column (56) extends into one of the groups of gap wheel grooves (53) during movement.

6. The automatic nut tightening device according to claim 5, characterized in that: The outer side surface of the eye nut feeding platform (46) is evenly provided with a swing groove (92), and a swing arm (61) is arranged in the swing groove (92). Short shafts (62) are symmetrically welded on both sides of the swing arm (61), and the short shafts (62) are fixed by a first bearing seat (63) and the groove wall of the swing groove (92). A contact wheel groove is provided at the lower end of the swing arm (61), and a contact wheel (611) is rotatably arranged in the contact wheel groove. A cam (612) is fitted at the lower end of the contact wheel (611), and the cam (612) is sleeved on the camshaft (613). The two ends of the camshaft (613) are fixed by a second bearing seat (614) and the inside of the eye nut feeding platform (46). One end of the camshaft (613) extends outward and is connected to a second servo motor (615) through a coupling. The second servo motor (615) is fixed inside the eye nut feeding platform (46).

7. The automatic nut tightening device according to claim 6, characterized in that: The upper end surface of the swing arm (61) is provided with a spring receiving sleeve (65), a bending spring (66) is installed in the spring receiving sleeve (65), the upper end of the bending spring (66) is fixed to the top of the swing groove (92), the end of the swing arm (61) extending out of the swing groove (92) is fixed with a nut sleeve rod (64), a plurality of groups of lifting ring nut members (6) are sleeved on the nut sleeve rod (64), the bottom of the lifting drive seat (10) and located above the unloading inclined seat (40) is provided with a curved material blocking groove (43) acting on the nut sleeve rod (64), the nut sleeve rod An air blowing channel (68) is horizontally opened at the lower position inside (64), and soot blowing holes (69) connected to the air blowing channel (68) are equidistantly opened on the top of the nut sleeve (64), and the soot blowing holes (69) act on the nut part of the corresponding lifting ring nut (6), and the end of the air blowing channel (68) is connected to an air supply hose (67), and each group of the air supply hose (67) extends inwardly and is connected to the exhaust port of the air storage tank (60), and an electromagnetic pulse valve is installed at the exhaust port. The air storage tank (60) extends upward from the inside of the lifting ring nut feeding platform (46).

8. The automatic nut tightening device according to claim 1, characterized in that: A No. 2 hydraulic cylinder (781) is arranged on the horizontal left side of one group of the No. 1 hydraulic cylinder (74); the rear ends of the No. 1 hydraulic cylinder (74) and the No. 2 hydraulic cylinder (781) are connected to oil pipes (785); the two groups of oil pipes (785) are connected to an oil change seat (786); a control oil pump (787) is installed in the oil change seat (786); a second hydraulic rod (782) is movably arranged in the No. 2 hydraulic cylinder (781) so as to extend horizontally outward; a wheel seat (783) is fixed at the end of the second hydraulic rod (782); a deviation correction wheel (784) is rotatably arranged in the wheel seat (783); a part of the deviation correction wheel (784) extends out of the wheel seat (783) and acts on the screw seat of the hexagonal bolt (5).

9. The automatic nut tightening device according to claim 2, characterized in that: A sealing wheel shell (80) is fixed inside the two groups of adjusting clamp seats (23), an oil dripping wheel (81) is fitted inside the sealing wheel shell (80), a plurality of groups of oil dripping holes (82) are evenly opened on the wheel surface of the oil dripping wheel (81), a rotating rod (83) is spline-connected at the middle of the oil dripping wheel (81), an inner bearing (84) is installed at the contact position between the rotating rod (83) and the sealing wheel shell (80), and one end of the rotating rod (83) is connected to the sealing wheel shell (80) by a damping bearing ( 85) and the inner wall of the adjusting clamp seat (23), the other end of the rotating rod (83) is sleeved with a driving wheel (86), the wheel surface of the driving wheel (86) is evenly distributed with ratchets (87), the lower end of the ratchets (87) is provided with a braking structure (89), and the lower part of the sealing wheel housing (80) is connected with an oil dripping capillary (88), and the oil dripping capillary (88) extends out of the outer side surface of the adjusting clamp seat (23) to act on the nut part of the lifting ring nut member (6).

10. The automatic nut tightening device according to claim 9, characterized in that: The braking structure (89) comprises an intermediate platform (891), a longitudinal slide groove (892), a top block (893), a fixing plate (894), a clamping plate (895), a braking shaft (896), a fitting surface (897), a return spring (898) and a guide column (899). The intermediate platform (891) is provided with a longitudinal slide groove (892) extending therethrough. A top block (893) is movably arranged in the longitudinal slide groove (892). The upper end of the top block (893) extends into the gap between adjacent ratchet teeth (87). The lower end of the top block (893) is fitted with a clamping plate (895). The clamping plate (895) is screwed to the adjusting clamp seat (894) via the fixing plate (894). 23), a brake shaft (896) is welded to one end of the intermediate platform (891), the brake shaft (896) extends out of the shaft groove (94), the shaft groove (94) is arranged at an upper position in the second clamping groove (28), the end of the brake shaft (896) is provided with a fitting surface (897) in contact with the outer side surface of the nut portion of the lifting ring nut member (6), a guide column (899) is welded to the other end of the intermediate platform (891), a guide seat for inserting the guide column (899) is horizontally arranged inside the adjusting clamp seat (23), and a return spring (898) sleeved on the outer side of the guide column (899) is fixed between the guide seat and the intermediate platform (891).

Images