A tower crane standard section automatic connecting device

Abstract

The application discloses a kind of tower crane standard section automatic connection device, and the nut automatic pre-tightening device of the automatic connection device includes fixed base, sliding platform, lifting platform, nut tightening device, telescopic sleeve, sliding cylinder, lifting cylinder and control system;Fixed base is fixedly installed in jacking sleeve frame;Sliding platform is slidably installed on the top of fixed base along horizontal direction;Sliding cylinder is fixedly installed on the bottom of fixed base;Lifting platform is slidably installed on sliding platform along vertical direction;Lifting cylinder is fixedly installed on sliding platform;Two nut tightening devices are movably installed on lifting platform;A telescopic sleeve capable of telescoping along vertical direction is installed at one end of each nut tightening device;Telescopic sleeve is used to disassemble and assemble two standard sections of self-locking bolt.The automatic connection device can reduce the labor intensity of workers, improve installation efficiency, and avoid the risk of falling during construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tower cranes, and particularly relates to a standard section automatic connecting device for a tower crane. BACKGROUND

[0002] At present, the problems in the connection of standard sections during the jacking and section adding process of a whole tower crane are as follows:

[0003] During the jacking and section adding process of a whole tower crane, the installation and pre-tightening of bolts and nuts are completed manually. During the installation of nuts, one worker uses a wrench to fix the bolt head, and another worker uses a torque wrench to complete the installation and pre-tightening of nuts. During the whole construction process, the operation position and standing position of the installation personnel are relatively small, and it is high-altitude operation and edge operation, so a slight carelessness can easily cause falling accidents.

[0004] During the jacking and section adding process of a whole tower crane, a large amount of nut installation and pre-tightening needs to be completed. During the high-frequency nut pre-tightening process, manual installation and pre-tightening are adopted, which not only has low work efficiency, but also causes the installation personnel to be unable to make all nuts reach the corresponding pre-tightening force due to exhaustion. When the pre-tightening torque of each bolt is quite different, the stress of the bolts is uneven, and the stress of a single bolt is too large, so the bolt is more likely to be broken. The accidents caused by bolt loosening or breaking occur frequently in engineering. SUMMARY

[0005] Therefore, the present application provides a standard section automatic connecting device for a tower crane, which can reduce the labor intensity of workers, improve the installation efficiency, and avoid the falling risk of workers during construction.

[0006] The present application adopts the following specific technical solutions:

[0007] A standard section automatic connecting device for a tower crane, which comprises:

[0008] A nut automatic pre-tightening device is fixedly installed at the inner side of a jacking sleeve, and comprises a fixed base, a sliding platform, a lifting platform, a nut tightening device, an extension sleeve, a sliding oil cylinder, a lifting oil cylinder, and a control system.

[0009] The fixed base is fixedly installed at the inner side of the jacking sleeve.

[0010] The sliding platform is slidably installed at the top of the fixed base in a horizontal direction, and is provided with a positioning groove matched with the shape of a main chord rod of the standard section and contact switches arranged on both sides of the positioning groove.

[0011] The sliding oil cylinder is fixedly installed at the bottom of the fixed base and used to drive the sliding platform to slide horizontally;

[0012] The lifting platform is slidingly installed on the sliding platform along the vertical direction;

[0013] The lifting oil cylinder is fixedly installed on the sliding platform and used to drive the lifting platform to move up and down;

[0014] Two nut tightening devices are movably installed on the lifting platform;

[0015] A telescopic sleeve capable of extending and retracting along the vertical direction is installed at one end of each nut tightening device;

[0016] The telescopic sleeve is used to disassemble and assemble the self-locking bolt connecting two standard joints;

[0017] The control system is signal connected with the contact switch, the nut tightening device, the sliding oil cylinder and the lifting oil cylinder.

[0018] Further, the other end of each nut tightening device is provided with a fixed sleeve;

[0019] The end of the fixed sleeve away from the nut tightening device is connected with an ear plate through a tension spring;

[0020] The ear plate is rotatably connected to the lifting platform through the pin shafts at both ends of the universal ball joint;

[0021] A limiting plate is fixedly installed on both sides of each fixed sleeve;

[0022] A compression spring is installed on the limiting plate and abuts between the limiting plate and the fixed sleeve along the horizontal direction;

[0023] A plurality of supporting springs are installed between the bottom surface of the fixed sleeve and the lifting platform.

[0024] Further, the top surface of the sliding platform is fixedly provided with a sliding guide rail and a travel switch;

[0025] The sliding platform is slidingly installed on the sliding guide rail;

[0026] The travel switch is signal connected with the control system and used to limit the sliding travel of the sliding platform;

[0027] The bottom of the lifting platform is provided with two guide columns arranged in parallel, which extend along the vertical direction, and the bottom end of the guide column is provided with a limiting block;

[0028] The sliding platform is provided with a guide hole corresponding to the guide column;

[0029] The guide column is inserted into the corresponding guide hole.

[0030] Further, the self-locking bolt comprises a slotted smooth head screw, a nut, a screw fixing sleeve, a sliding block, an annular spring and a positioning pin;

[0031] The top end of the slotted smooth head screw is threadedly connected with the nut, the bottom end is provided with a chamfer and the outer circumferential surface is provided with a plurality of grooves;

[0032] The top end of the nut is provided with a tapered guide block;

[0033] The telescopic sleeve is used for clamping the nut so as to drive the nut to rotate;

[0034] The screw fixing sleeve is provided with a central hole matched with the slotted smooth head screw, a concave hole corresponding to the groove and an annular groove arranged on the outer circumferential surface;

[0035] The concave hole is located in the annular groove, and one sliding block is inserted into each concave hole;

[0036] The inner end of the sliding block is provided with a chamfer on one side in the circumferential direction, so that the sliding block can slide out of the groove when the slotted smooth head screw rotates towards the chamfer side;

[0037] The outer end surface of the sliding block is provided with an arc-shaped groove;

[0038] The annular spring is sleeved in the arc-shaped groove and the annular groove;

[0039] The positioning pin is fixedly installed on the top end surface of the screw fixing sleeve in the circumferential direction;

[0040] When the bottom end of the slotted smooth head screw is inserted into the central hole of the screw fixing sleeve, the inner end of the sliding block is embedded in the groove under the elastic force of the annular spring, so as to lock the slotted smooth head screw in the screw fixing sleeve.

[0041] Further, the telescopic sleeve comprises an upper sleeve, a lower sleeve, a torque sensor and an elastic buffer with displacement monitoring;

[0042] The upper sleeve is fixedly connected with the nut tightening device;

[0043] The upper sleeve and the lower sleeve are connected through a spline and can relatively slide in the vertical direction;

[0044] The elastic buffer is installed between the upper sleeve and the lower sleeve;

[0045] The lower sleeve is provided with a torque sensor for detecting the tightening torque;

[0046] The torque sensor is signal connected with the control system;

[0047] The elastic buffer is used for detecting the compression amount between the upper sleeve and the lower sleeve;

[0048] The lower sleeve is provided with a guide surface for guiding the nut into the central hole, and a polygonal hole matched with the outer peripheral surface of the nut.

[0049] Further, the telescopic sleeve further comprises a positioning pin and a safety pin;

[0050] The outer peripheral surface of the upper sleeve is provided with a pair of guide grooves uniformly distributed in the circumferential direction;

[0051] The lower sleeve is provided with a threaded hole corresponding to the guide groove;

[0052] The positioning pin is threadedly connected with the threaded hole and extends into the guide groove, so as to realize the sliding connection between the lower sleeve and the upper sleeve;

[0053] The top of the upper sleeve is matched with the square hole of the nut tightening device, and is provided with a through hole extending in the radial direction;

[0054] The safety pin is inserted into the through hole, and the safety pin is used for preventing the upper sleeve from being separated from the nut tightening device.

[0055] Further, two bolt sleeves are fixedly installed at the top and bottom of the standard section.

[0056] The bolt sleeves extend in the vertical direction, and are used for penetrating the slotted head screw;

[0057] The bottom surface of the top bolt sleeve is provided with a positioning hole corresponding to the positioning pin.

[0058] Beneficial effects:

[0059] 1. The automated connection device of the present invention is used for the automatic connection between standard sections of a tower crane, including an automatic nut pre-tightening device and self-locking bolts fixedly installed at the four corners of the lifting frame; the automatic nut pre-tightening device includes a fixed base, a sliding platform, a lifting platform, a nut tightening device, a telescopic sleeve, a sliding cylinder, a lifting cylinder, and a control system; the control system controls the sliding cylinder to realize the horizontal displacement of the sliding platform and controls the lifting cylinder to realize the vertical lifting of the lifting platform, thereby driving the nut tightening device and the telescopic sleeve to align spatially with the self-locking bolts connecting the standard sections, and the self-locking bolts are connected under the action of the nut tightening device, thereby connecting the two standard sections together; the automated connection device with the above structure can realize the automatic connection of the self-locking bolts connecting two standard sections without manual operation. Therefore, the automated connection device can reduce the labor intensity of workers, improve installation efficiency, and avoid the risk of workers falling during construction.

[0060] 2. In the automated connection device of the present invention, each nut tightening device is rotatably connected to the lifting platform via a fixed sleeve, a tension spring, a lug plate, a universal joint, and a pin arranged sequentially. The universal joint provides multiple degrees of freedom for the nut tightening device, allowing it to adaptively adjust its position according to the position of the self-locking bolt, enabling the nut tightening device to quickly align with the self-locking bolt and complete the connection quickly. Simultaneously, a limiting plate is fixedly installed on both sides of each fixed sleeve, and a compression spring is installed on the limiting plate. The compression spring abuts against the limiting plate and the fixed sleeve in the horizontal direction. The limiting plate limits the adjustment range of the nut tightening device, preventing misalignment due to large-range adjustments. The compression spring also resets the nut tightening device, keeping it always between the two limiting plates. When the position of the self-locking bolt on the standard section is fixed, the adjustment range of the nut tightening device is reduced, further improving the efficiency of aligning the nut tightening device with the self-locking bolt.

[0061] 3. The self-locking bolt of the automated connection device of the present invention includes a slotted smooth head screw, a nut, a screw fixing sleeve, a slider, a ring spring, and a positioning pin; the screw fixing sleeve is fixedly installed on the standard section, and the slotted smooth head screw and the screw fixing sleeve can be connected by the insertion and engagement of the slider and the groove, and the connection between the standard sections is tightened by the threaded connection between the nut and the slotted smooth head screw, which simplifies the connection of the self-locking bolt, thereby realizing automatic connection and improving the connection efficiency between standard sections.

[0062] 4, The telescopic sleeve of the automatic connecting device comprises an upper sleeve, a lower sleeve, a torque sensor and an elastic buffer with displacement monitoring, the elastic buffer is used for detecting the compression amount between the upper sleeve and the lower sleeve, and meanwhile, the elastic buffer can also solve the problem of different stroke synchronization of a pair of self-locking bolts in the simultaneous installation process; the lower sleeve is provided with a guide surface for guiding the nut to enter the central hole and a polygonal hole matched with the shape of the outer peripheral surface of the nut, the nut is facilitated to enter the lower sleeve through the guide surface, the nut is matched with the shape of the nut to realize the tightness of the nut, and the automatic connection between the upper and lower standard sections is realized.

[0063] 5, The telescopic sleeve of the automatic connecting device further comprises a safety pin, the top of the upper sleeve is provided with a through hole extending in the radial direction, the safety pin is inserted into the through hole, the safety pin can prevent the upper sleeve from being separated from the nut tightening device, the safety hazard is reduced, and the use safety of the automatic connecting device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 It is a working state schematic diagram of the automatic connecting device of the embodiment of the application.

[0065] Figure 2 It is a partial enlarged structure schematic diagram of part A. Figure 1

[0066] Figure 3 It is a structure schematic diagram of the standard section of the tower crane.

[0067] Figure 4 It is a partial enlarged structure schematic diagram of part B. Figure 3

[0068] It is a structure schematic diagram of one angle of the nut automatic pre-tightening device. Figure 5

[0069] It is a structure schematic diagram of another angle of the nut automatic pre-tightening device. Figure 6

[0070] It is a connection structure schematic diagram between the fixed sleeve and the lifting platform in the nut automatic pre-tightening device. Figure 7

[0071] It is a structure schematic diagram of the sliding platform in the nut automatic pre-tightening device. Figure 8

[0072] It is a structure schematic diagram of the self-locking bolt used for connecting the standard section. Figure 9

[0073] It is an explosion structure schematic diagram of the bottom of the slotted smooth head screw rod and the screw rod fixing sleeve in the self-locking bolt. Figure 10

[0074] It is an explosion structure schematic diagram of the bottom of the slotted smooth head screw rod and the screw rod fixing sleeve in the self-locking bolt.​Figure 11 This is a schematic diagram of the telescopic sleeve in the automatic nut preload device.

[0075] Figure 12 This is a schematic diagram of the exploded structure of the telescopic sleeve.

[0076] Among them, 1-standard section, 2-lifting sleeve, 3-automatic nut pre-tightening device, 4-bolt sleeve, 5-self-locking bolt, 6-fixed base, 7-sliding platform, 8-lifting platform, 9-nut tightening device, 10-telescopic sleeve, 11-sliding cylinder, 12-lifting cylinder, 13-main chord, 14-positioning groove, 15-contact switch, 16-fixed sleeve, 17-tension spring, 18-ear plate, 19-universal ball joint, 20-pin, 21-limiting plate, 22-sliding guide rail, 23-traverse... 24-Guide post, 25-Limit block, 26-Guide hole, 27-Slotted smooth head screw, 28-Nut, 29-Screw fixing sleeve, 30-Slider, 31-Annular spring, 32-Positioning pin, 33-Groove, 34-Concave hole, 35-Annular groove, 36-Arc groove, 37-Chamfer, 38-Rounding, 39-Upper sleeve, 40-Lower sleeve, 41-Elastic buffer, 42-Spline, 43-Positioning pin, 44-Guide groove, 45-Threaded hole, 46-Square hole, 47-Through hole Detailed Implementation

[0077] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0078] This invention provides an automated connection device for standard sections of a tower crane. The tower crane includes a standard section 1 and a lifting frame 2. Figure 3 and Figure 4 The diagram illustrates the three-dimensional structure of standard section 1. Standard section 1 is a frame structure. Standard section 1 includes four vertical main chords 13 and diagonal web members connected between the main chords 13. Two bolt sleeves 4 are provided at the top and bottom of the main chords 13. The upper and lower standard sections 1 are fixedly connected by two self-locking bolts 5 passing through them. Figure 1 and Figure 2 The diagram illustrates the assembly structure of the lifting sleeve 2 and the standard section 1 during the installation of the top standard section 1. The lifting sleeve 2 is fitted onto the outer periphery of the top standard section 1.

[0079] The automated connection device includes an automatic nut pre-tightening device 3 and a self-locking bolt 5;

[0080] The nut automatic pre-tightening device 3 is fixedly installed on the inner side of the four corners of the jacking sleeve frame 2, and comprises a fixed base 6, a sliding platform 7, a lifting platform 8, a nut tightening device 9, an extension sleeve 10, a sliding oil cylinder 11, a lifting oil cylinder 12, and a control system; the nut automatic pre-tightening device 3 fixedly installed on the inner side of the four corners of the jacking sleeve frame 2 is provided with two nut tightening devices 9 corresponding to two bolt sleeves 4 respectively, and each nut tightening device 9 corresponds to a self-locking bolt 5, so that the eight self-locking bolts 5 on the four corners of the standard section 1 can be connected simultaneously by the two nut tightening devices 9 installed on the four corners of the jacking sleeve frame 2;

[0081] The fixed base 6 is fixedly installed on the inner side of the jacking sleeve frame 2, and the fixed base 6 can be directly welded to the jacking sleeve frame 2;

[0082] The sliding platform 7 is slidably installed on the top of the fixed base 6, and is provided with a positioning groove 14 matched with the shape of the main chord 13 of the standard section 1 and a contact switch 15 arranged on both sides of the positioning groove 14; the top surface of the sliding platform 7 is fixedly installed with a sliding guide rail 22 and a travel switch 23, as shown in Figure 5 and Figure 6 Two sliding guide rails 22 are fixedly installed on the top surface of the sliding platform 7 in parallel; the sliding platform 7 is slidably installed on the sliding guide rail 22, and the sliding guide rail 22 can be provided with a sliding groove, and the sliding platform 7 is guided to slide by the protrusions matched with the shape of the sliding groove; the travel switch 23 is signal-connected with the control system, and is used for limiting the sliding travel of the sliding platform 7;

[0083] The sliding oil cylinder 11 is fixedly installed on the bottom of the fixed base 6, and is used for driving the sliding platform 7 to slide horizontally;

[0084] As shown in Figure 8 , the lifting platform 8 is slidably installed on the sliding platform 7 in the vertical direction; as shown in Figure 5 and Figure 6 , the bottom of the lifting platform 8 is provided with two guide columns 24 arranged in parallel, the guide columns 24 extend in the vertical direction, and the bottom end of the guide column 24 is provided with a limiting block 25; as shown in Figure 8 , the sliding platform 7 is provided with a guide hole 26 corresponding to the guide column 24; the guide column 24 is arranged in the corresponding guide hole 26;

[0085] The lifting oil cylinder 12 is fixedly installed on the sliding platform 7, and is used for driving the lifting platform 8 to move up and down;

[0086] The two nut tightening devices 9 are movably installed on the lifting platform 8; as shown in Figure 5 , Figure 6 and Figure 7As shown, one end of each nut tightening device 9 is provided with a telescopic sleeve 10 capable of extending and retracting in the vertical direction, and the other end is provided with a fixed sleeve 16; the end of the fixed sleeve 16 away from the nut tightening device 9 is connected with an ear plate 18 through a tension spring 17; the ear plate 18 is rotationally connected to the lifting platform 8 through the pin shaft 20 at both ends of the universal ball joint 19; one limiting plate 21 is fixedly installed on each side of the fixed sleeve 16; a compression spring is installed on the limiting plate 21 and abuts between the limiting plate 21 and the fixed sleeve 16 in the horizontal direction; a plurality of supporting springs are installed between the bottom surface of the fixed sleeve 16 and the lifting platform 8;

[0087] The telescopic sleeve 10 is used for disassembling and assembling the self-locking bolt 5 connecting the two standard sections 1;

[0088] The control system is signal connected with the contact switch 15, the nut tightening device 9, the sliding oil cylinder 11 and the lifting oil cylinder 12.

[0089] The above-mentioned automatic connection device is used for the automatic connection between the standard sections of the tower crane, which comprises the nut automatic pre-tightening device 3 and the self-locking bolt 5 fixedly installed at the four corners of the jacking sleeve frame 2; the nut automatic pre-tightening device 3 comprises the fixed base 6, the sliding platform 7, the lifting platform 8, the nut tightening device 9, the telescopic sleeve 10, the sliding oil cylinder 11, the lifting oil cylinder 12 and the control system; the sliding oil cylinder 11 is controlled by the control system to realize the displacement of the sliding platform 7 in the horizontal direction, and the lifting oil cylinder 12 is controlled by the control system to realize the lifting of the lifting platform 8 in the vertical direction, so as to drive the nut tightening device 9 and the telescopic sleeve 10 to be aligned with the self-locking bolt 5 connecting the standard sections 1 in space, and realize the connection of the self-locking bolt 5 under the action of the nut tightening device 9, so as to connect the two standard sections 1 together; the automatic connection device with the above-mentioned structure can realize the automatic connection of the self-locking bolt 5 connecting the two standard sections 1, without manual operation, so that the automatic connection device can reduce the labor intensity of workers, improve the installation efficiency, and avoid the falling risk of workers during construction.

[0090] Each nut tightening device 9 of the automatic connecting device is rotationally connected to the lifting platform 8 through a fixing sleeve 16, a tension spring 17, an ear plate 18, a universal ball joint 19 and a pin shaft 20 arranged in sequence; the nut tightening device 9 has multiple degrees of freedom through the universal ball joint 19, so that the position of the nut tightening device 9 can be adaptively adjusted according to the position of the self-locking bolt 5, and the nut tightening device 9 can be quickly aligned with the self-locking bolt 5 to quickly complete the connection of the self-locking bolt 5; meanwhile, a limiting plate 21 is fixedly installed on both sides of each fixing sleeve 16, and a compression spring is installed on the limiting plate 21 and abuts against the limiting plate 21 and the fixing sleeve 16 in the horizontal direction, the adjusting range of the nut tightening device 9 can be limited through the limiting plate 21 to prevent the alignment from being difficult to adjust in a large range, and the nut tightening device 9 can be reset through the compression spring to keep the nut tightening device 9 always in the middle of the two limiting plates 21; when the position of the self-locking bolt 5 on the standard joint 1 is fixed, the adjusting range of the nut tightening device 9 can be reduced to further improve the alignment efficiency of the nut tightening device 9 with the self-locking bolt 5.

[0091] In a specific embodiment, as shown in Figure 2 、 Figure 9 and Figure 10 , the self-locking bolt 5 includes a slotted smooth head screw 27, a nut 28, a screw fixing sleeve 29, a sliding block 30, an annular spring 31 and a positioning pin 32.

[0092] The top end of the slotted smooth head screw 27 is threadedly connected with the nut 28, the bottom end is provided with a chamfer 37 and the outer circumferential surface is provided with a plurality of grooves 33; the top end of the nut 28 is provided with a tapered guide block; the telescopic sleeve 10 is used for clamping with the nut 28 to drive the nut 28 to rotate; the screw fixing sleeve 29 is provided with a central hole for plug-in cooperation with the slotted smooth head screw 27, a concave hole 34 corresponding to each groove 33, and an annular groove 35 arranged on the outer circumferential surface in the circumferential direction; the concave hole 34 is located in the annular groove 35, and a sliding block 30 is inserted into each concave hole 34; the inner end of the sliding block 30 is provided with a rounded corner 38 on one side in the circumferential direction, so that the sliding block 30 can slide out of the groove 33 when the slotted smooth head screw 27 rotates towards the rounded corner 38 side; the outer end surface of the sliding block 30 is provided with an arc-shaped groove 36; the annular spring 31 is sleeved in the arc-shaped groove 36 and the annular groove 35; the positioning pin 32 is distributed in the circumferential direction and is fixedly installed on the top end surface of the screw fixing sleeve 29.

[0093] When the bottom end of the slotted smooth head screw 27 is inserted into the central hole of the screw fixing sleeve 29, the inner end of the sliding block 30 is embedded in the groove 33 under the elastic force of the annular spring 31, so as to lock the slotted smooth head screw 27 in the screw fixing sleeve 29.

[0094] The self-locking bolt 5 of the automatic connection device comprises a slotted smooth head screw 27, a nut 28, a screw fixing sleeve 29, a sliding block 30, an annular spring 31 and a positioning pin 32. The screw fixing sleeve 29 is fixedly installed on the standard joint 1. The slotted smooth head screw 27 is connected with the screw fixing sleeve 29 through the plug-in cooperation of the sliding block 30 and the groove 33, and then the connection between the standard joints 1 is fastened through the threaded connection of the nut 28 and the slotted smooth head screw 27, so that the connection of the self-locking bolt 5 is simplified, the automatic connection is realized, and the connection efficiency between the standard joints 1 is improved.

[0095] Further, as shown in Figure 5 、 Figure 11 and Figure 12 , the telescopic sleeve 10 comprises an upper sleeve 39, a lower sleeve 40, a torque sensor and an elastic buffer 41 with displacement monitoring;

[0096] The upper sleeve 39 is fixedly connected with the nut tightening device 9. The upper sleeve 39 and the lower sleeve 40 are connected through the spline 42 and can slide relative to each other in the vertical direction. The elastic buffer 41 is installed between the upper sleeve 39 and the lower sleeve 40. The lower sleeve 40 is provided with a torque sensor for detecting the tightening torque. The torque sensor is signal-connected with the control system. The elastic buffer 41 is used for detecting the compression amount between the upper sleeve 39 and the lower sleeve 40. The lower sleeve 40 is provided with a guide surface for guiding the nut 28 into the central hole and a polygonal hole matched with the shape of the outer peripheral surface of the nut 28.

[0097] The telescopic sleeve 10 of the automatic connection device comprises an upper sleeve 39, a lower sleeve 40, a torque sensor and an elastic buffer 41 with displacement monitoring. The elastic buffer 41 is used for detecting the compression amount between the upper sleeve 39 and the lower sleeve 40. At the same time, the elastic buffer 41 can also solve the problem of different strokes of a pair of self-locking bolts 5 during simultaneous installation. The lower sleeve 40 is provided with a guide surface for guiding the nut 28 into the central hole and a polygonal hole matched with the shape of the outer peripheral surface of the nut 28. The nut 28 is easily guided into the lower sleeve 40 through the guide surface, and the tightness of the nut 28 is realized through the shape matching of the polygonal hole and the nut 28, so as to realize the automatic connection between the upper and lower standard joints 1.

[0098] Specifically, as shown in Figure 12As shown, the telescopic sleeve 10 further comprises a positioning pin 43 and a safety pin; the outer circumferential surface of the upper sleeve 39 is provided with a pair of circumferentially uniformly distributed guide grooves 44; the lower sleeve 40 is provided with a threaded hole 45 corresponding to each guide groove 44; the positioning pin 43 is threadedly connected with the threaded hole 45 and extends into the guide groove 44, thereby achieving the sliding connection between the lower sleeve 40 and the upper sleeve 39; the top of the upper sleeve 39 is matched with the square hole 46 of the nut tightening device 9 and is provided with a through hole 47 extending in the radial direction; the safety pin is inserted into the through hole 47 and is used to prevent the upper sleeve 39 from being separated from the nut tightening device 9.

[0099] On the basis of the above various embodiments, as shown in Figure 3 and Figure 4 two bolt sleeves 4 are fixedly installed at the top and bottom of the standard section 1; as shown in Figure 2 the bolt sleeves 4 extend in the vertical direction and are used to pass through the slotted light head screw 27; the bottom surface of the top bolt sleeve 4 is provided with a positioning hole corresponding to the positioning pin 32.

[0100] The telescopic sleeve 10 of the above automatic connection device further comprises a safety pin, the top of the upper sleeve 39 is provided with a through hole 47 extending in the radial direction, the safety pin is inserted into the through hole 47, and the safety pin can prevent the upper sleeve 39 from being separated from the nut tightening device 9, thereby reducing the safety hazard and improving the use safety of the automatic connection device.

[0101] The above automatic connection device is coordinated and matched with the self-locking bolt 5 preinstalled on the standard section 1 and the nut automatic pre-tightening device 3 fixedly installed on the jacking sleeve frame 2, thereby achieving the automatic connection between the standard sections 1 during the jacking process of the tower crane; the specific working process is as follows:

[0102] 1. The fixed base 6 is fixed on one corner of the cross beam of the jacking sleeve frame 2 through a bolt set, and one set of nut automatic pre-tightening device 3 is fixed on each corner of the cross beam of the entire jacking sleeve frame 2;

[0103] 2. The nut 28 of the self-locking bolt 5 is installed on the slotted light head screw 27, then the slotted light head screw 27 provided with the nut 28 is placed in the bolt sleeve 4 of the standard section 1, and then the standard section 1 is hoisted, introduced and positioned;

[0104] 3. The control system sends a signal to open the electromagnetic valve of the sliding oil cylinder 11, the piston rod of the sliding oil cylinder 11 drives the sliding platform 7 to move forward, when the positioning groove 14 at the end of the sliding platform 7 is in contact with the main chord 13 of the standard section 1 and the two contact switches 15 are in contact with the main chord 13, the contact switches 15 feed back the detection signal to the control system, and the control system sends a signal to close the electromagnetic valve of the control sliding oil cylinder 11, at this time, the sliding oil cylinder 11 is in a holding state;

[0105] 4、Control system opens electromagnetic valve of lifting oil cylinder 12, lifting oil cylinder 12's piston rod drives lifting platform 8 to move downwards, lifting platform 8 upper end is equipped with nut tightening device 9, nut tightening device 9 lower end is equipped with telescopic sleeve 10, lifting platform 8 drives telescopic sleeve 10 to move downwards, when lower sleeve 40 end moves to the lower plane of nut 28, when the center line of nut 28 is not concentric with the center line of lower sleeve 40, telescopic sleeve 10 drops in the process, tapered guide block will guide telescopic sleeve 10 to slide downwards, facilitate nut 28 to enter the inside of telescopic sleeve 10, while nut tightening device 9 on lifting platform 8 can also adaptively adjust a certain displacement.

[0106] 5、Lifting platform 8 moves downwards in the process of telescopic sleeve 10 elastic buffer 41 will be compressed, when telescopic sleeve 10 compression reaches maximum, control system sends off electromagnetic valve of control lifting oil cylinder 12 start-stop, at this time, lifting oil cylinder 12 is in the state of keeping, nut tightening device 9 starts, telescopic sleeve 10 rotates 30 °, in the process of telescopic sleeve 10 rotating 30 °, telescopic sleeve 10 compression suddenly changes, indicating that nut 28 has entered the inside of telescopic sleeve 10;If the compression does not mutate, indicating that nut 28 enters the inside of telescopic sleeve 10 along the tapered guide surface of lower sleeve 40 at first;Control system controls nut tightening device 9 to drive telescopic sleeve 10 to rotate until the torque sensor detects that the pretightening torque of nut 28 reaches the corresponding set value, nut tightening device 9 stops working, at this time, control system opens electromagnetic valve of lifting oil cylinder 12 reverse operation, lifting oil cylinder 12's piston rod rises until lifting platform 8 reaches the highest position, then electromagnetic valve of slide oil cylinder 11 is opened, slide oil cylinder 11's piston rod drives slide platform 7 to move backwards until travel switch 23 receives signal and stops moving.

[0107] 6、Nut automatic pretightening device 3 rises with jacking sleeve frame 2, repeats the above steps 2-5 to complete the automatic connection of standard section 1 interval self-locking bolt 5 again.

[0108] In conclusion, the above is only the preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automated connection device for standard sections of a tower crane, characterized in that, include: The automatic nut pre-tightening device is fixedly installed at the four inner corners of the lifting frame and includes a fixed base, a sliding platform, a lifting platform, a nut tightening device, a telescopic sleeve, a sliding cylinder, a lifting cylinder, and a control system. The fixed base is fixedly installed on the inner side of the lifting frame; The sliding platform can be slidably installed on the top of the fixed base in a horizontal direction, and is provided with a limiting groove that matches the shape of the main chord of the standard section and contact switches provided on both sides of the limiting groove; The sliding cylinder is fixedly installed at the bottom of the fixed base and is used to drive the sliding platform to slide horizontally. The lifting platform can be slidably installed on the sliding platform in a vertical direction; The lifting cylinder is fixedly installed on the sliding platform and is used to drive the lifting platform to perform lifting movements; The two nut tightening devices are movably mounted on the lifting platform; A telescopic sleeve capable of extending and retracting in the vertical direction is installed at one end of each of the nut tightening devices; The telescopic sleeve is used to assemble and disassemble the self-locking bolts connecting the two standard sections; The control system is signal-connected to the contact switch, the nut tightening device, the sliding cylinder, and the lifting cylinder; Each of the aforementioned nut tightening devices has a retaining sleeve installed at the other end; The end of the fixing sleeve that is away from the nut tightening device is connected to an ear plate by a tension spring. The ear plate is rotatably connected to the lifting platform via pins at both ends of the universal ball joint; A limiting plate is fixedly installed on both sides of each of the fixed sleeves; A compression spring is installed on the limiting plate, and the compression spring abuts against the limiting plate and the fixing sleeve in a horizontal direction. Multiple support springs are installed between the bottom surface of the fixed sleeve and the lifting platform; The self-locking bolt includes a slotted smooth head screw, a nut, a screw fixing sleeve, a slider, a ring spring, and a positioning pin; The top end of the slotted smooth head screw is threaded with the nut, and the bottom end is chamfered and the outer circumferential surface is provided with multiple grooves; A tapered guide block is provided at the top of the nut; The telescopic sleeve is used to engage with the nut, thereby driving the nut to rotate; The screw fixing sleeve is provided with a central hole that is inserted and mated with the slotted smooth head screw, a concave platform hole that corresponds one-to-one with the groove, and an annular groove provided on the outer peripheral surface along the circumferential direction. The recessed holes are all located within the annular groove, and a slider is inserted into each of the recessed holes; The inner end of the slider is rounded on one side along the circumference, which allows the slider to slide out of the groove when the slotted screw rotates toward the rounded side. The outer end face of the slider is provided with an arc groove; The annular spring is sleeved within the arc-shaped groove and the annular groove; The locating pins distributed circumferentially are fixedly installed on the top surface of the screw fixing sleeve; When the bottom end of the slotted die screw is inserted into the center hole of the screw fixing sleeve, the inner end of the slider is embedded in the groove under the elastic force of the ring spring, thus locking the slotted die screw in the screw fixing sleeve.

2. The automated connection device as described in claim 1, characterized in that, The top surface of the sliding platform is fixedly equipped with a sliding guide rail and a limit switch; The sliding platform is slidably mounted on the sliding guide rail; The limit switch is connected to the control system signal and is used to limit the sliding stroke of the sliding platform; The bottom of the lifting platform is provided with two parallel guide columns that extend vertically and have limit blocks at their bottom ends. The sliding platform is provided with guide holes that correspond one-to-one with the guide posts; The guide post is inserted into the corresponding guide hole.

3. The automated connection device as described in claim 1, characterized in that, The telescopic sleeve includes an upper sleeve, a lower sleeve, a torque sensor, and an elastic buffer with displacement monitoring. The upper sleeve is fixedly connected to the nut tightening device; The upper sleeve and the lower sleeve are connected by a spline and can slide relative to each other in the vertical direction; The elastic buffer is installed between the upper sleeve and the lower sleeve; The lower sleeve is equipped with a torque sensor for detecting tightening torque; The torque sensor is connected to the control system signal. The elastic buffer is used to detect the amount of compression between the upper sleeve and the lower sleeve; The lower sleeve is provided with a guide surface for guiding the nut into the central hole and a polygonal hole that matches the shape of the outer circumference of the nut.

4. The automated connection device as described in claim 3, characterized in that, The telescopic sleeve also includes a positioning pin and a safety pin; The outer circumferential surface of the upper sleeve is provided with a pair of guide grooves evenly distributed along the circumferential direction; The lower sleeve is provided with threaded holes that correspond one-to-one with the guide grooves; The positioning pin is threadedly connected to the threaded hole and extends into the guide groove to realize the sliding connection between the lower sleeve and the upper sleeve; The top of the upper sleeve is fitted with the nut tightening device by a square hole and is provided with a through hole extending radially. The safety pin is inserted into the through hole to prevent the upper sleeve from disengaging from the nut tightening device.

5. The automated connection device as described in any one of claims 1, 3, and 4, characterized in that, Two bolt sleeves are fixedly installed at each of the four corners at the top and bottom of the standard section; The bolt sleeves all extend vertically and are used to insert the slotted smooth head bolts; Each of the top bolt sleeves has a positioning hole on its bottom surface that corresponds to one of the positioning pins.

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