Bolt base plate self-adaptive tightening device for box beam lifting

Abstract

The invention belongs to the technical field of box beam assembling equipment, and particularly relates to a box beam lifting bolt base plate self-adaptive tightening device which comprises a mounting seat, a hollow rotating platform and a self-adaptive assembling mechanism. The hollow rotating platform is rotatably mounted on the mounting seat, an inner cavity of the hollow rotating platform is used for placing a nut, a driving motor is fixedly mounted on the mounting seat, and the output end of the driving motor is in belt transmission connection with the hollow rotating platform through a belt; by arranging the mounting base, the hollow rotating platform and the self-adaptive assembling mechanism, on one hand, a nut and a bolt base plate are combined into a whole and do not need to penetrate into a suspender twice, on the other hand, connection of the nut, the bolt base plate and the suspender is achieved in an automatic screwing mode, the labor amount of workers is effectively reduced, and the working efficiency is improved. Only the automation, high efficiency and intelligent degree of the connection operation are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of box girder assembly equipment, and specifically relates to an adaptive tightening device for bolt pads used in lifting box girders. Background Art

[0002] A box girder generally refers to a beam with a cross-sectional shape identical to that of a box. It is generally composed of a cover plate, a floating plate, a bottom plate, and a partition. Since the closed thin-walled cross-section of the box girder has a very large torsional stiffness, it is particularly advantageous for curved bridges and bridges constructed using the cantilever method. Therefore, it is usually applied to bridges with a large span.

[0003] In the production, paving, and erection of railway bridges, especially high-speed railway bridge box girders, a beam lifter is required to hoist the beam body. The number of hoisting times for each beam body is at least three times. First, when the beam body is demolded, when the concrete strength of the beam body reaches more than 75% of the design value and the edges and corners will not be damaged due to demolding, the beam body is removed from the beam body mold. Second, when the beam body needs to be moved on the beam storage pedestal in the beam storage area, hoisting is required. Third, when the beam body is hoisted from the beam storage pedestal to the beam transporter. Fourth, when the bridge erecting machine is erecting the beam body, the necessary movement and hoisting of the beam body mean that nuts and pads need to be frequently installed and disassembled. The frequent disassembly work brings a heavy workload and poses high requirements for the work efficiency of the hoisting preparation work.

[0004] In the preparation process of the existing box girder hoisting process, it is usually necessary to pass the suspension rod through the inside of the box girder. Subsequently, two workers respectively lift and screw the pad and the nut onto the suspension rod to complete the connection between the suspension rod and the box girder. In the traditional operation process, the inventor found that there are the following problems with this operation method:

[0005] First, in the operation of screwing the nut and the pad onto the lower part of the suspension rod in the traditional method, manual labor is generally used at the construction site at present. The total weight of the nut and the pad is about 90 kg, and the weight of the nut is about 50 kg. The screwing process is extremely heavy and laborious, posing high requirements for the age and physical strength of the workers.

[0006] Second, the screwing process requires two operations, first the pad and then the nut, further increasing the operation difficulty.

[0007] Third, the nut and the pad are relatively heavy. During the installation process, the pad does not rotate, and there is relative movement during the rotation of the nut. Moreover, the outer side of the nut is circular, making it difficult to directly use automated machinery.

[0008] Fourth, the manual operation efficiency is low. The heavy nuts and pads are extremely likely to cause physical fatigue during the screwing operation and handling operation. Workers need to rest frequently, and the speed of manually screwing and assembling the nuts and pads is slow.

[0009] In view of this, the present invention proposes an adaptive tightening device for bolt pads used in lifting box girders to solve the above technical problems. Summary of the Invention

[0010] In order to make up for the deficiencies of the prior art and solve the above technical problems, the present invention proposes an adaptive tightening device for bolt pads used in lifting box girders.

[0011] The technical solution adopted by the present invention to solve its technical problems is as follows: An adaptive tightening device for bolt pads used in lifting box girders according to the present invention includes a mounting base, a hollow rotating platform, and an adaptive assembly mechanism;

[0012] The hollow rotating platform is rotatably mounted on the mounting base. The inner cavity of the hollow rotating platform is used to place nuts. A driving motor is fixedly installed on the mounting base, and the output end of the driving motor is connected to the hollow rotating platform through a belt for belt drive connection;

[0013] A centering chuck is installed on the hollow rotating platform, and the centering chuck is used to clamp the nuts;

[0014] The adaptive assembly mechanism is installed on the placed bolts, and the adaptive assembly mechanism is used to assemble the bolt pads and nuts. The adaptive assembly mechanism includes:

[0015] An adjustable clamping frame, which is a frame-type mechanism body with adjustable dimensions, and the bolt pad is installed on the adjustable clamping frame;

[0016] A connecting block and a positioning ring group. A plurality of connecting blocks are installed on the adjustable clamping frame, and a positioning ring group is fixedly installed on the common lower surface of the plurality of connecting blocks. The positioning ring group is sleeved on the nut;

[0017] A tenon is fixedly installed on the mounting base, and one of the connecting blocks is sleeved with the tenon.

[0018] Preferably, the adjustable clamping frame is a quadrilateral structure formed by the perpendicular sliding connection of multiple groups of adjustable clamping plates;

[0019] The adjustable clamping plate is composed of a clamping plate, an adjusting screw, a transmission pipe, and a guiding slide bar;

[0020] The adjusting screw and the guiding slide bar are arranged in parallel and are both installed on the connecting block;

[0021] The clamping plate is fixedly installed on the transmission pipe, and the clamping plates are all L-shaped structure bodies;

[0022] The clamping plates and the transmission pipes are symmetrically installed at both ends of the guiding slide bar and the adjusting screw. The transmission pipe is slidably connected to the guiding slide bar, and the transmission pipe is in screw drive connection with the adjusting screw.

[0023] Preferably, the positioning ring set is composed of an annular slide rail, a positioning rod and an annular rotating frame;

[0024] The annular slide rail is fixedly installed below the connecting block, and an annular chute is formed in the annular slide rail;

[0025] The annular rotating frame is slidably installed in the annular chute, a plurality of positioning tubes are fixedly installed below the annular rotating frame, and a positioning rod is rotatably installed in the positioning tube.

[0026] Preferably, a positioning hole is formed in the nut, and the diameter of the positioning rod is smaller than the diameter of the positioning hole.

[0027] Preferably, a pulling plate is installed on one side of the positioning tube close to the nut, the pulling plate is elastically connected with the positioning tube through a centering spring, a through hole is formed in the pulling plate, the positioning rod penetrates through the pulling plate, and the diameter of one end of the positioning rod close to the nut is larger than the diameter of the through hole.

[0028] Preferably, it further includes a self-adjusting mechanism, the self-adjusting mechanism cooperates with the adaptive assembly mechanism, and the self-adjusting mechanism includes:

[0029] A toothed ring, the toothed ring is fixedly installed on the annular rotating frame, and the toothed ring rotates synchronously with the annular rotating frame;

[0030] A transmission wheel set, a transmission groove is formed in the connecting block, the transmission groove is connected with the annular chute in a conducting manner, and a transmission wheel set is installed in the transmission groove;

[0031] A driven wheel, the adjusting screw penetrates through the transmission groove, a driven wheel is fixedly installed on the adjusting screw in the transmission groove, and the driven wheel, the transmission wheel set and the toothed ring are sequentially meshed and connected.

[0032] Preferably, the self-adjusting mechanism further includes a locking tooth, a release groove is formed in the adjusting screw, the locking tooth is elastically installed in the release groove through a spring, and uniformly distributed clamping grooves are formed in the driven wheel. In the initial state, the locking tooth extends into the release groove under the elastic action of the spring.

[0033] Preferably, elastic buffer pads are fixedly installed on one side of the clamping plates facing the connecting block.

[0034] Preferably, the elastic buffer pad is a hollow structure body, a one-way air outlet and a one-way air inlet are formed in the elastic buffer pad, and a warning whistle is installed at the end of the one-way air outlet.

[0035] Preferably, a plurality of the elastic buffer pads are connected in a conducting manner through a ventilation pipe.

[0036] The beneficial effects of the present invention are as follows:

[0037] 1. An adaptive tightening device for bolt pads used in lifting box girders. By setting up a mounting base, a hollow rotating platform and an adaptive assembly mechanism, on the one hand, the nut and the bolt pad are combined into a whole, eliminating the need to insert them into the suspension rod in two separate operations. On the other hand, through an automatic screwing method, the connection between the nut, the bolt pad and the suspension rod is achieved, effectively reducing the workload of the staff and improving the automation, efficiency and intelligence of the connection operation.

[0038] 2. An adaptive tightening device for bolt pads used in lifting box girders. By setting up a self-adjusting mechanism, with the rotation of the hollow rotating platform, the adjustable clamping frame automatically adjusts its size, facilitating the installation of the bolt pad on the adjustable clamping frame, further reducing the labor intensity of the staff. At the same time, after the driven wheel separates from the adjusting screw, as the toothed ring continues to rotate, when the card slot aligns with the card teeth, under the action of the spring, the card teeth enter the card slot, and then under the drive of the rotational force, the card teeth disengage from the card slot again. With the repetition of the above reaction, when the nut is screwed onto the end of the suspension rod, the clamping force of the adjustable clamping frame on the bolt pad remains stable, preventing the bolt pad from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings.

[0040] Figure 1 is the assembled three-dimensional view of the present invention and the bolt screwing machine for lifting beams;

[0041] Figure 2 is the three-dimensional view of the present invention;

[0042] Figure 3 is the schematic belt drive diagram of the driving motor and the hollow rotating platform;

[0043] Figure 4 is the three-dimensional view of the adaptive assembly mechanism;

[0044] Figure 5 is the three-dimensional view of the adjustable clamping plate;

[0045] Figure 6 is the cross-sectional view of the elastic buffer pad;

[0046] Figure 7 is the three-dimensional view of the positioning ring group;

[0047] Figure 8 is the cross-sectional view of the transmission groove;

[0048] Figure 9 is the connection schematic diagram of the adjusting screw and the driven wheel;

[0049] In the figure: 1. Mounting base; 11. Hollow rotating platform; 12. Driving motor; 13. Centering chuck; 14. Tenon; 2. Adjustable clamping bracket; 21. Adjustable clamping plate; 22. Clamping plate; 23. Adjusting screw; 24. Transmission pipe; 25. Guide slide bar; 26. Connecting block; 27. Transmission groove; 3. Positioning ring group; 31. Annular slide rail; 33. Annular rotating frame; 34. Annular chute; 35. Positioning pipe; 36. Positioning rod; 4. Positioning hole; 41. Pulling plate; 42. Through hole; 43. Centering spring; 5. Tooth ring; 51. Transmission wheel group; 52. Driven wheel; 53. Teeth; 54. Release groove; 55. Card slot; 56. Elastic buffer pad; 57. Unidirectional air outlet; 58. Unidirectional air inlet; 6. Whistle; 61. Vent pipe. Detailed implementation mode

[0050] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the specific implementation modes.

[0051] As Figures 1 to 9 shown, a bolt pad self-adaptive tightening device for lifting box girders according to the present invention includes a mounting base 1, a hollow rotating platform 11 and a self-adaptive assembly mechanism;

[0052] The hollow rotating platform 11 is rotatably installed on the mounting base 1. The inner cavity of the hollow rotating platform 11 is used to place nuts. A driving motor 12 is fixedly installed on the mounting base 1. The output end of the driving motor 12 is belt-drivenly connected to the hollow rotating platform 11 through a belt;

[0053] A centering chuck 13 is installed on the hollow rotating platform 11. The centering chuck 13 is used to clamp nuts;

[0054] The self-adaptive assembly mechanism is installed on the placed bolts. The self-adaptive assembly mechanism is used to assemble bolt pads and nuts. The self-adaptive assembly mechanism includes:

[0055] An adjustable clamping bracket 2. The adjustable clamping bracket 2 is a frame-type mechanism body with adjustable dimensions. The bolt pad is installed on the adjustable clamping bracket 2;

[0056] A connecting block 26 and a positioning ring group 3. A plurality of connecting blocks 26 are installed on the adjustable clamping bracket 2. The lower surfaces of the plurality of connecting blocks 26 are jointly fixedly installed with a positioning ring group 3. The positioning ring group 3 is sleeved on the nut;

[0057] A tenon 14 is fixedly installed on the mounting base 1. One of the connecting blocks 26 is sleeved with the tenon 14.

[0058] When assembling and hoisting the suspension rod and the box girder, the suspension rod penetrates into the interior of the box girder. At this time, the bolt backing plate and the nut need to be installed at the end of the suspension rod. In order to enhance the convenience of installing the bolt backing plate and the nut and reduce the working difficulty, the present invention sets an installation seat 1, a hollow rotating platform 11 and an adaptive assembly mechanism, and cooperates with a beam lifting bolt screwing machine to transport the nut and the bolt backing plate into the interior of the box girder and assemble them with the suspension rod, thereby reducing the labor burden of the staff.

[0059] Specifically, the mounting plate in the present invention is fixedly installed at the end of the beam lifting bolt screwing machine. The beam lifting screw screwing machine described here is used to transport and lift the adaptive tightening device. The mounting plate is detachably fixedly installed on the telescopic end of the beam lifting screw screwing machine. The hollow rotating platform 11 is rotatably installed on the mounting seat 1. When the driving motor 12 rotates, under the driving action of the belt, the hollow rotating platform 11 can rotate. In the initial state, the adaptive assembly mechanism is placed on the adaptive platform. When placing the nut, the staff needs to first remove the adaptive assembly mechanism, and then place the nut in the groove on the hollow rotating platform 11. Subsequently, the control program is manually started, and the centering chuck 13 clamps the nut. During the clamping process, the nut is coaxially arranged with the hollow rotating platform 11. Then the adaptive assembly mechanism is placed on the nut. When placing, the center of the positioning ring group 3 is roughly aligned with the center of the nut. Then the adaptive assembly mechanism is rotated, so that one of the connecting blocks 26 of the adaptive assembly mechanism is aligned with the tenon 14, and the tenon 14 limits it. Then the length and width dimensions of the adjustable clamping frame 2 are adjusted to make the adjustable clamping frame 2 match the bolt backing plate. Then the bolt backing plate is clamped and fixed by the adjustable clamping frame 2. At the same time, it should be noted that a laser rangefinder and a camera are installed at the end of the beam lifting screw screwing machine in this application, which can take pictures of the interior of the box girder during the process of transporting and lifting the adaptive tightening device and transmit the data to the on-board computer installed on the rigid housing of the chassis of the beam lifting screw screwing machine. Controlled by the on-board computer, the operator operates through the touch screen and the control program. The staff controls the beam lifting bolt screwing machine according to the displayed slide, so as to align the center of the bolt backing plate with the suspension rod. At this time, the beam lifting screw screwing machine lifts the adaptive tightening device, so that the suspension rod is inserted into the bolt backing plate and the nut. At the same time, the driving motor 12 rotates, and under the driving action of the belt, the hollow rotating platform 11, the centering chuck 13 and the nut rotate. During this process, due to the limiting action of the tenon 14 on the adjustable clamping frame 2, the adjustable clamping frame 2 and the bolt backing plate are in a static state. As the nut continues to rotate, the nut is screwed onto the end of the suspension rod. And as the nut rises on the suspension rod, the bolt backing plate is fixed inside the box girder. Then the centering chuck 13 releases the clamping of the nut, and the tenon 14 separates downward from the connecting block 26, that is, a single adaptive tightening operation of the bolt backing plate is completed.

[0060] The present invention forms an integrated unit by setting up a mounting base 1, a hollow rotating platform 11, and an adaptive assembly mechanism. On the one hand, the nut and the bolt backing plate are combined into a whole, eliminating the need to insert the suspension rod twice. On the other hand, through an automatic screwing method, the connection between the nut, the bolt backing plate, and the suspension rod is achieved, effectively reducing the workload of the staff and improving the automation, efficiency, and intelligence of the connection operation.

[0061] The adjustable clamping frame 2 is a quadrilateral structure formed by the perpendicular sliding connection of multiple adjustable clamping plates 21.

[0062] The adjustable clamping plate 21 is composed of a clamping plate 22, an adjusting screw 23, a transmission pipe 24, and a guiding slide rod 25.

[0063] The adjusting screw 23 and the guiding slide rod 25 are arranged in parallel and are both installed on the connecting block 26.

[0064] The clamping plate 22 is fixedly installed on the transmission pipe 24, and the clamping plates 22 are all L-shaped structures.

[0065] The clamping plates 22 and the transmission pipe 24 are symmetrically installed at both ends of the guiding slide rod 25 and the adjusting screw 23. The transmission pipe 24 is slidably connected to the guiding slide rod 25, and the transmission pipe 24 is in screw drive with the adjusting screw 23.

[0066] In the present invention, the adjustable clamping frame 2 is composed of multiple adjustable clamping plates 21. The multiple adjustable clamping plates 21 are arranged perpendicular to each other to form a quadrilateral structure. The adjustable clamping plate 21 is composed of a clamping plate 22, an adjusting screw 23, a transmission pipe 24, and a guiding slide rod 25. When adjusting the length of the adjustable clamping plate 21, the staff only needs to rotate the adjusting screw 23. Through the screw drive between the adjusting screw 23 and the transmission pipe 24, and the guiding effect of the guiding slide rod on the transmission pipe 24, the transmission pipe 24 is caused to change from rotation to linear motion, so that the clamping plates 22 at both ends of the same adjusting screw 23 move away from or close to each other, thereby realizing the adjustment of the length and width of the quadrilateral formed by the adjustable clamping plates 21. When the length and width of the adjustable clamping frame 2 match the bolt backing plate to be clamped, the bolt backing plate is clamped between the multiple clamping plates 22, and then the adjusting screw 23 is rotated in the reverse direction to increase the clamping force of the clamping plates 22 on the bolt backing plate.

[0067] The present invention uses the adjustable clamping frame 2 to clamp the bolt backing plate. Through the free change of the size of the adjustable clamping frame 2, the adjustable clamping frame 2 can adapt to different bolt backing plates. Combined with the adaptation of the centering chuck 13 to nuts of different sizes, the adaptive tightening device designed by the present invention has a wider application range and stronger practicability.

[0068] The positioning ring set 3 is composed of an annular slide rail 31, positioning rods 36 and an annular rotating frame 33;

[0069] The annular slide rail 31 is fixedly installed below the connecting block 26, and an annular chute 34 is formed in the annular slide rail 31;

[0070] The annular rotating frame 33 is slidably installed in the annular chute 34. A plurality of positioning tubes 35 are fixedly installed below the annular rotating frame 33, and the positioning rods 36 are rotatably installed in the positioning tubes 35.

[0071] The nut is provided with a positioning hole 4, and the diameter of the positioning rod 36 is smaller than the diameter of the positioning hole 4.

[0072] Since the adaptive assembly mechanism is placed above the nut and the centering chuck 13, in order to ensure that the nut and the bolt cushion plate are always centered during the lifting and delivery processes, the positioning ring set 3 in the present invention is composed of an annular slide rail 31, positioning rods 36 and an annular rotating frame 33. In the present invention, when the centering chuck 13 clamps the nut, the adaptive assembly mechanism is then assembled with the bolt cushion plate, and subsequently the adaptive assembly mechanism is placed on the nut. When placing, first roughly align the center of the annular slide rail 31 with the center of the nut, and then manually rotate and adjust the positioning rods 36 installed on the positioning tubes 35 so that the ends of the plurality of positioning rods 36 away from the positioning tubes 35 are inserted into the positioning holes 4 on the nut. During the adjustment, it is necessary to make the distances between the plurality of positioning rods 36 and the positioning tubes 35 the same. Therefore, after the plurality of positioning rods 36 are connected to the nut, the centers of the annular slide rail 31 and the annular rotating frame 33 will be aligned with the center of the nut, thereby aligning the bolt cushion plate with the center of the nut. When the hollow rotating platform 11 drives the centering chuck 13 and the nut to rotate, under the limiting action of the nut and the positioning rods 36, the positioning rods 36 and the positioning tubes 35 will be driven to rotate simultaneously. At this time, the design of the annular rotating frame 33 and the annular chute 34 will cooperate with the limiting action of the tenon 14 on the connecting block 26, so that the rotation of the nut will not affect the bolt cushion plate.

[0073] A pull plate 41 is installed on the side of the positioning tube 35 close to the nut. The pull plate 41 is elastically connected to the positioning tube 35 through a centering spring 43. A through hole 42 is formed in the pull plate 41. The positioning rod 36 passes through the pull plate 41, and the diameter of the end of the positioning rod 36 close to the nut is larger than the diameter of the through hole 42.

[0074] In order to further enhance the convenience of aligning the annular slide rail 31 with the nut, in the present invention, a pull plate 41 is installed on the positioning pipe 35 through a centering spring 43, and the positioning rod 36 passes through the pull plate 41 through the through hole 42. During assembly, the staff first manually drives the positioning rod 36 to move away from the center of the annular slide rail 31, pulling the pull plate 41, causing the pull plate 41 to compress the centering spring 43. After the annular slide rail 31 is sleeved on the nut, the positioning ring is controlled to move into the positioning hole 4, so that the centering spring 43 relaxes. The centering spring 43 pushes the pull plate 41, causing the pull plate 41 to abut against the outer surface of the nut. Multiple pull plates 41 generate a thrust in the circumferential direction of the nut, so that the annular slide rail 31 adjusts its position by itself, cooperating with the adjustment of the staff, and finally aligning the bolt cushion plate with the center of the nut.

[0075] As a preferred embodiment of the present invention, it further includes a self-adjusting mechanism, and the self-adjusting mechanism cooperates with the adaptive assembly mechanism. The self-adjusting mechanism includes:

[0076] A toothed ring 5, which is fixedly installed on the annular rotating frame 33, and the toothed ring 5 rotates synchronously with the annular rotating frame 33;

[0077] A transmission wheel set 51. A transmission groove 27 is formed on the connecting block 26, and the transmission groove 27 is conductively connected to the annular sliding groove 34. The transmission wheel set 51 is installed in the transmission groove 27;

[0078] In the embodiment, the transmission wheel set 51 is composed of a gear and a worm and worm gear. The gear is meshed with the toothed ring 5, the gear is fixedly installed at one end of the worm, and the turbine is installed between the worm and the driven wheel 52, so that the rotation of the toothed ring 5 can drive the driven wheel 52 to rotate. In other embodiments of the present application, the transmission wheel set 51 can also select other mechanisms to be used for transmitting between the toothed ring 5 and the driven wheel 52;

[0079] A driven wheel 52. The adjusting screw 23 passes through the transmission groove 27, and the driven wheel 52 is fixedly installed in the transmission groove 27 of the adjusting screw 23. The driven wheel 52, the transmission wheel set 51 and the toothed ring 5 are meshed in sequence.

[0080] The self-adjusting mechanism further includes a locking tooth 53. A release groove 54 is formed on the adjusting screw 23, and the locking tooth 53 is elastically installed in the release groove 54 through a spring. Uniformly distributed card slots 55 are formed on the driven wheel 52. In the initial state, the locking tooth 53 extends into the release groove 54 under the elastic action of the spring.

[0081] To facilitate the connection between the adjustable clamping bracket 2 and the bolt backing plate, in the present invention, after the centering chuck 13 clamps the nut, the adaptive assembly mechanism is installed above the nut at this time, and the adaptive assembly mechanism is aligned with the center of the nut, and the tenon 14 limits the connecting block 26. Subsequently, the staff controls the driving motor 12 to drive the hollow rotating platform 11, the chuck and the nut to rotate through the control program. The nut drives the annular rotating frame 33 to rotate through the positioning rod 36 and the positioning tube 35. The toothed ring 5 fixedly installed on the annular rotating frame 33 rotates synchronously with it. Under the transmission of the transmission pulley group 51, the rotation of the toothed ring 5 ultimately causes the driven wheel 52 to rotate. The driven wheel 52 drives the adjusting screw 23 to rotate, so that the size of the adjustable clamping bracket 2 first gradually expands. Subsequently, after the bolt backing plate is placed on the adjustable clamping bracket 2, the driving motor 12 is controlled to rotate in the reverse direction, so that the size of the adjustable clamping bracket 2 gradually shrinks, and finally the bolt backing plate is clamped. During this process, due to the possible differences in the length and width of the bolt backing plate, when the adjustable clamping plate 21 in a certain direction first clamps on the bolt backing plate, as the toothed ring 5 continues to rotate, a driving force will be applied to the driven wheel 52, so that the driven wheel 52 applies a force to the locking teeth 53, causing the locking teeth 53 to contract and disengage from the inside of the disengaging groove 54, resulting in the separation of the driven wheel 52 and the adjusting screw 23. At this time, the rotation of the driven wheel 52 will not drive the adjusting screw 23. When the driven wheel 52 stops, at this time, under the elastic action of the spring, the locking teeth 53 will be inserted into the card slot 55 again, which is convenient for the next transmission.

[0082] By setting the self-adjusting mechanism in the present invention and using the rotation of the hollow rotating platform 11, the size of the adjustable clamping bracket 2 is automatically adjusted, which is convenient for installing the bolt backing plate on the adjustable clamping bracket 2, further reducing the labor intensity of the staff. At the same time, after the driven wheel 52 is separated from the adjusting screw 23, as the toothed ring 5 continues to rotate, when the card slot 55 is aligned with the locking teeth 53, under the action of the spring, the locking teeth 53 enter the card slot 55, and then under the drive of the rotational force, the locking teeth 53 disengage from the card slot 55 again. As the above reaction is repeated, when the nut is screwed onto the end of the hanging rod, the clamping force of the adjustable clamping bracket 2 on the bolt backing plate is kept stable, avoiding the loosening of the bolt backing plate.

[0083] As a preferred embodiment of the present invention, elastic buffer pads 56 are fixedly installed on one side of the clamping plate 22 facing the connecting block 26.

[0084] The elastic buffer pad 56 is a hollow structure. A one-way air outlet 57 and a one-way air inlet 58 are provided on the elastic buffer pad 56, and a warning whistle 6 is installed at the end of the one-way air outlet 57.

[0085] Multiple elastic buffer pads 56 are connected through a ventilation pipe 61.

[0086] During the process of reducing the size of the adjustable clamping bracket 2 and clamping the bolt backing plate, the elastic buffer pad 56 fixed on the clamping plate 22 first contacts the bolt backing plate. As the distance between the clamping plate 22 and the bolt backing plate decreases, the spring buffer pad is compressed. Under the conduction of the ventilation pipe 61, the elastic buffer pad 56 transports the air inside to the elastic buffer pad 56 that is not squeezed. As multiple elastic buffer pads 56 finally contact the bolt backing plate one by one, the air pressure inside the elastic buffer pad 56 continues to increase. Under the action of the air pressure, the one-way air outlet 57 is conducted, and during the process of the air flow out, it passes through the warning whistle 6, thereby emitting a sound. When the air inside multiple elastic buffer pads 56 is completely discharged, the sound of the warning whistle 6 stops at this time, reminding the staff that the assembly is completed, which is convenient for the staff to control the driving motor 12 to stop.

[0087] It should be noted that in the present invention, both the one-way air outlet 57 and the one-way air inlet 58 are one-way valves with a certain opening pressure. A certain pressure is required in their conduction state. The elastic force after the elastic buffer pad 56 is compressed by itself can make the one-way air inlet 58 open. When the elastic buffer pad 56 is compressed, the air flow inside it first flows into other conductive elastic buffer pads 56 through the ventilation pipe 61. When the air pressure in the conductive elastic buffer pads 56 all rises to the opening pressure of the one-way air outlet 57, the gas will flow outwards.

[0088] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive tightening device for bolt pads for box beam lifting beams, characterized in that: It comprises a mounting seat (1), a hollow rotating platform (11) and an adaptive assembly mechanism; The hollow rotating platform (11) is rotatably mounted on the mounting seat (1); the inner cavity of the hollow rotating platform (11) is used to place nuts; a driving motor (12) is fixedly mounted on the mounting seat (1); the output end of the driving motor (12) is connected to the hollow rotating platform (11) through a belt drive; A centering chuck (13) is installed on the hollow rotating platform (11), and the centering chuck (13) is used to clamp the nut; The self-adaptive assembly mechanism is installed on the placement bolt, and the self-adaptive assembly mechanism is used to assemble the bolt pad and the nut, and the self-adaptive assembly mechanism includes: An adjustable clamping frame (2), the adjustable clamping frame (2) being a frame-type mechanism with adjustable size, the bolt pad being mounted on the adjustable clamping frame (2); A connecting block (26) and a positioning ring group (3), wherein a plurality of connecting blocks (26) are mounted on the adjustable clamping frame (2), a positioning ring group (3) is fixedly mounted on the lower surfaces of the plurality of connecting blocks (26), and the positioning ring group (3) is sleeved on the nut; A tenon (14) is fixedly mounted on the mounting seat (1), and one of the connecting blocks (26) is sleeved with the tenon (14).

2. The self-adaptive tightening device for bolt pads of box beam lifting beams according to claim 1, characterized in that: The adjustable clamping frame (2) is a quadrilateral structure formed by a plurality of sets of adjustable clamping plates (21) connected to each other in a vertical sliding manner; The adjustable clamping plate (21) is composed of a clamping plate (22), an adjusting screw rod (23), a transmission tube (24) and a guide slide rod (25); The adjusting screw rod (23) and the guide slide rod (25) are arranged in parallel and are both mounted on the connecting block (26); The clamping plates (22) are fixedly mounted on the transmission tube (24), and the clamping plates (22) are all L-shaped structures; The clamping plate (22) and the transmission tube (24) are symmetrically mounted at the two ends of the guide slide bar (25) and the adjusting screw (23); the transmission tube (24) is slidably connected to the guide slide bar (25); and the transmission tube (24) and the adjusting screw (23) are spirally driven.

3. The self-adaptive tightening device for bolt pads of box beam bail according to claim 2, characterized in that: The positioning ring assembly (3) is composed of an annular slide rail (31), a positioning rod (36) and an annular rotating frame (33); The annular slide rail (31) is fixedly installed below the connecting block (26), and an annular slide groove (34) is provided in the annular slide rail (31); The annular rotating frame (33) is slidably mounted in the annular sliding groove (34), a plurality of positioning tubes (35) are fixedly mounted below the annular rotating frame (33), and positioning rods (36) are rotatably mounted in the positioning tubes (35).

4. The self-adaptive tightening device for bolt pads for box beam lifting beams according to claim 3, characterized in that: The nut is provided with a positioning hole (4), and the diameter of the positioning rod (36) is smaller than the diameter of the positioning hole (4).

5. The self-adaptive tightening device for bolt pads of box beam lifting beams according to claim 3, characterized in that: A pull plate (41) is installed on the side of the positioning tube (35) close to the nut. The pull plate (41) is elastically connected to the positioning tube (35) through a centering spring (43). A through hole (42) is opened on the pull plate (41). The positioning rod (36) passes through the pull plate (41), and the diameter of the end of the positioning rod (36) close to the nut is larger than the diameter of the through hole (42).

6. The self-adaptive tightening device for bolt pads for box beam lifting beams according to claim 5, characterized in that: It also includes a self-adjusting mechanism, which cooperates with the adaptive assembly mechanism, and the self-adjusting mechanism includes: A gear ring (5), wherein the gear ring (5) is fixedly mounted on the annular rotating frame (33), and the gear ring (5) rotates synchronously with the annular rotating frame (33); A transmission wheel group (51), wherein a transmission groove (27) is formed on the connection block (26), the transmission groove (27) is conductively connected to the annular sliding groove (34), and the transmission wheel group (51) is installed in the transmission groove (27); The driven wheel (52) is provided with the adjusting screw (23) penetrating the transmission groove (27). The adjusting screw (23) is fixedly mounted with the driven wheel (52) in the transmission groove (27). The driven wheel (52), the transmission wheel set (51) and the gear ring (5) are meshed and connected in sequence.

7. The self-adaptive tightening device for bolt pads of box beam bail according to claim 6, characterized in that: The self-adjusting mechanism further comprises a latching tooth (53), a disengagement groove (54) is provided on the adjusting screw rod (23), the latching tooth (53) is elastically mounted in the disengagement groove (54) by means of a spring, and evenly distributed latching grooves (55) are provided on the driven wheel (52). In an initial state, the latching tooth (53) extends into the disengagement groove (54) under the elastic action of the spring.

8. The self-adaptive tightening device for bolt pads of box beam bail according to claim 7, characterized in that: An elastic buffer pad (56) is fixedly mounted on one side of the clamping plate (22) facing the connecting block (26).

9. The self-adaptive tightening device for bolt pads for box beam lifting beams according to claim 8, characterized in that: The elastic buffer pad (56) is a hollow structure. A one-way air outlet (57) and a one-way air inlet (58) are provided on the elastic buffer pad (56). A warning whistle (6) is installed at the end of the one-way air outlet (57).

10. The self-adaptive tightening device for bolt pads of box beam bail according to claim 9, characterized in that: The plurality of elastic buffer pads (56) are connected via a ventilation pipe (61).

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