Sway reduction device for bridge crane hook assembly

Abstract

The present invention provides a sway reduction device for a hook group of a bridge crane, comprising a telescopic rod and a plurality of displacement sensors, a control device and a driving device; the lower end of the telescopic rod is arranged on the top of the hanging plate of the hook group, and the middle part is installed on the telescopic rod mounting seat through a self-aligning roller bearing; the displacement sensor is arranged on the trolley frame of the bridge crane, and is evenly arranged on a circumference with the telescopic rod as the center, for detecting the position of the telescopic rod; the displacement sensor outputs the displacement data of the telescopic rod to the control device, and the control device analyzes the swing direction of the hook group according to the received plurality of displacement data, and outputs a driving instruction to the driving device; the driving device executes the driving instruction, and drives the trolley or car of the bridge crane to slow down or accelerate. The present invention monitors the swing amplitude of the hook group through a plurality of displacement sensors, and the control device controls the driving device of the trolley or car in the corresponding direction to slow down or accelerate according to the swing amplitude of the hook group, so as to reduce the swing of the hook group.

Description

Technical Field

[0001] The invention relates to the technical field of building construction machinery, and in particular to a swing reduction device for a bridge crane hook group. Background Art

[0002] When the crane is lifting objects, starting, stopping and positioning, the hook group and the objects being lifted are prone to swing due to inertia and other reasons, which will cause low operating efficiency, many safety hazards and other problems. In order to achieve the effect of reducing the swing of the hook group, existing cranes mostly use mechanical methods. Some install pull ropes in multiple directions of the hook to reduce the swing of the hook group, some reduce the swing of the hook group by modifying the sling, and some use elastic components to buffer to reduce the swing of the hook group. The effect is not ideal. Moreover, these methods are also likely to cause the construction site to be messy, difficult to control, and have many restrictions. Summary of the invention

[0003] The present invention provides a sway reduction device for a hook assembly of a bridge crane to solve at least one of the above problems.

[0004] According to one aspect of the present invention, there is provided a sway reduction device for a hook group of a bridge crane, comprising a telescopic rod and a plurality of displacement sensors, a control device and a drive device; the lower end of the telescopic rod is arranged on the top of a hanging plate of the hook group, and the middle part is mounted on a telescopic rod mounting seat through a spherical roller bearing; the telescopic rod mounting seat is arranged on a trolley frame of the bridge crane; the displacement sensors are arranged on the trolley frame of the bridge crane, and are evenly arranged on a circumference with the telescopic rod as the center, for detecting the position of the telescopic rod; the displacement sensor outputs the displacement data of the telescopic rod to the control device, the control device analyzes the swing direction of the hook group according to the received plurality of displacement data, and outputs a driving instruction to the drive device; the drive device executes the driving instruction, and drives the trolley or car of the bridge crane to decelerate or accelerate.

[0005] The swing reduction device of the bridge crane hook group of the present invention monitors the swing amplitude of the hook group through multiple displacement sensors. The control device controls the driving device of the trolley or car in the corresponding direction to slow down or accelerate according to the swing amplitude of the hook group, thereby reducing the swing of the hook group.

[0006] In some embodiments, the telescopic rod of the present invention includes a plurality of telescopic joints sleeved from the outside to the inside, the outermost telescopic joint includes an upper pressure plate, a steel pipe and a lower pressure plate, and each internal telescopic joint includes an upper pressure plate, a sliding bearing, a connecting shaft, a steel pipe and a lower pressure plate arranged in sequence from top to bottom; on the same telescopic joint, the steel pipe is fixedly connected to the lower end of the connecting shaft, the sliding bearing is sleeved outside the connecting shaft, and the upper pressure plate is connected to the upper end of the connecting shaft; the outer diameter of the sliding bearing is larger than the outer diameter of the steel pipe; the outer diameter of the upper pressure plate is smaller than the outer diameter of the sliding bearing and larger than the inner diameter of the sliding bearing; the inner diameter of the lower pressure plate is consistent with the inner diameter of the steel pipe; the lower part of the lower pressure plate is connected to a flange ring, and the inner diameter of the flange ring is larger than the outer diameter of the steel pipe of the adjacent inner telescopic joint and smaller than the outer diameter of the sliding bearing of the adjacent inner telescopic joint.

[0007] In some embodiments, there is a gap between adjacent expansion joints of the present invention, and the gap between the sliding bearing on the inner expansion joint and its adjacent outer expansion joint is smaller than the gap between the steel pipes. When the inner expansion joint is eccentric or the hook is deflected, the sliding bearing slides in the steel pipe of the adjacent outer expansion joint.

[0008] In some embodiments, the gap between adjacent steel tubes of the expansion joints of the present invention is 2-3 mm.

[0009] In some embodiments, the clearance between the sliding bearing of the present invention and the adjacent outer expansion joint is 1-2 mm.

[0010] In some embodiments, a telescopic rod shaft is welded to the outside of the outermost telescopic joint of the present invention, and the telescopic rod shaft is mounted on a telescopic rod mounting seat via a spherical roller bearing; the telescopic rod mounting seat is fixedly connected to the trolley frame of the bridge crane.

[0011] In some embodiments, the present invention also includes a winding structure of a wire rope of a hoisting device, as well as a left fixed pulley block, a right fixed pulley block, a left movable pulley block, a right movable pulley block and a balance wheel; the two ends of the wire rope are respectively fixed to the two ends of the drum of the hoisting device, and the middle of the wire rope is hung on the balance wheel as a balance wheel section; the left section of the wire rope includes a left winding section bypassing the left section of the main hoist drum, a left fixed pulley section bypassing the left fixed pulley block, and a left movable pulley section bypassing the left movable pulley block; the right section of the wire rope includes a right movable pulley section bypassing the right movable pulley block, a right fixed pulley section bypassing the right fixed pulley block, and a right winding section bypassing the right section of the main hoist drum. Therefore, the friction between the wire rope and the fixed pulley block and the movable pulley block and the balancing effect of the balance wheel can reduce the swing of the hook group.

[0012] In some embodiments, the trolley frame of the present invention is in the shape of a rectangular frame as a whole, including two parallel first and second main beams; the two ends of the support of the left fixed pulley block, the right fixed pulley block and the balance wheel are respectively supported above the first and second main beams, and the pulley shaft directions of the left fixed pulley block, the right fixed pulley block and the balance wheel are perpendicular to the first and second main beams. Therefore, the friction between the wire rope and the fixed pulley block and the movable pulley block and the balancing effect of the balance wheel can reduce the swing of the hook group during the movement of the trolley. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic structural diagram of a bridge crane according to an embodiment of the present invention;

[0014] Figure 2 for Figure 1 The schematic diagram of the trolley structure of the bridge crane is shown;

[0015] Figure 3 It is a structural schematic diagram of a main hook, a movable pulley block, a fixed pulley block and a balance wheel of a bridge crane according to an embodiment of the present invention;

[0016] Figure 4 for Figure 3 The schematic diagram of the winding of the wire rope of the hoisting device of the bridge crane on the main hook group and the movable pulley group, the fixed pulley group and the balance wheel is shown;

[0017] Figure 5 for Figure 3 The schematic diagram of the principle of the swing reduction structure of the bridge crane hook group shown;

[0018] Figure 6 , Figure 7 and Figure 8 It is a schematic diagram of a swing reduction structure of a bridge crane hook assembly according to another embodiment of the present invention;

[0019] Figure 9-11 The present invention is a schematic diagram of a trolley frame structure of a bridge crane according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0022] Finally, it should be noted that, in this article, relational terms such as first and second, counterclockwise and clockwise, forward and reverse are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include" and "comprise" include not only those elements, but also other elements not explicitly listed, or also include elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device that includes the elements.

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] Figure 1 The structure of a bridge crane according to one embodiment of the present invention is schematically shown.

[0025] refer to Figure 1 As shown, the bridge crane includes a trolley 21 and a small trolley 22.

[0026] The frame of the trolley 21 is in the shape of a rectangular frame, including two parallel bridge frames 211 and end beams connecting the two ends of the bridge frames 211. Travel rollers are arranged at the bottom of the two ends of the bridge frame 211 of the trolley 21. The travel rollers are driven by a motor, and the trolley 21 as a whole can move back and forth along its track.

[0027] Figure 2 Schematically shows Figure 1 The structure of the trolley of the bridge crane is shown.

[0028] refer to Figure 2 As shown, the trolley frame 221 of the trolley 22 is in the shape of a rectangular frame as a whole, including two parallel first main beams 251 and second main beams 252, and two sub-beams 254 respectively connected to the first main beams 251 and second main beams 252 at both ends. There is also a supporting beam 253 parallel to the first main beam 251 and second main beam 252, and the supporting beam 253 is used to support the small hook 262. The two ends of the trolley frame 221 are respectively slidably connected to the two bridge frames 211, and the bridge frames 211 are provided with second tracks, and the lower part of the sub-beam 254 is provided with rollers adapted to the second tracks. The rollers of the trolley 22 are driven by a motor, and the trolley 22 can move back and forth along the bridge frame 211 of the cart 21.

[0029] The main winch drum 23 is arranged on the first main beam 251 of the trolley frame 221. The two fixed pulley blocks 241 include a left fixed pulley block 2411 and a right fixed pulley block 2412. The pulley shaft directions of the left fixed pulley block 2411, the right fixed pulley block 2412 and the balance wheel 243 are perpendicular to the first main beam 251 and the second main beam 252. The two ends of the support of the left fixed pulley block 2411, the right fixed pulley block 2412 and the balance wheel 243 are supported above the first main beam 251 and the second main beam 252 respectively. The main hook block includes a left movable pulley block 2421, a right movable pulley block 2422, a hanging plate 270 and a main hook 261. The main hook 261 of the main trolley is connected to the two movable pulley blocks 242 (the left movable pulley block 2421 and the right movable pulley block 2422) through the hanging plate 270. The rated load of the main hook 261 is 200 tons. The small hook 262 is located below the support beam 253 and has a rated load of 25 tons.

[0030] Figure 3 and Figure 4 The main hook, movable pulley block, fixed pulley block and balance wheel of a bridge crane according to an embodiment of the present invention are schematically shown, as well as the winding structure of the wire rope.

[0031] refer to Figure 3 and Figure 4 As shown, the two ends of the wire rope 271 of the main hoist drum 23 are respectively fixed to the two ends of the main hoist drum 23, and the middle of the wire rope 271 is hung on the balance wheel 243 as the balance wheel section 543. The left section of the wire rope 271 includes the left winding section 541 that bypasses the left section of the main hoist drum, the left fixed pulley section 511 that bypasses the left fixed pulley group 2411, and the left movable pulley section 521 that bypasses the left movable pulley group 2421; the right section of the wire rope 271 includes the right movable pulley section 522 that bypasses the right movable pulley group 2422, the right fixed pulley section 512 that bypasses the right fixed pulley group 2412, and the right winding section 542 that bypasses the right section of the main hoist drum. In this embodiment, each movable pulley group 242 has three movable pulleys, and each fixed pulley group 241 has three fixed pulleys, so the wire rope is wound three times between the fixed pulley group and the movable pulley group on the same side.

[0032] The trolley of a traditional bridge crane adopts a main beam, and the movable pulley block and the hook are located below the main beam, so the operating space of the hook can only be below the main beam, and in order to achieve sufficient strength, the height of the main beam will be made relatively large, so that a large space is required above the bridge frame of the bridge crane for the trolley to operate, and there is more space below the bridge frame that is non-hoisting space, and the lifting height of the hook is relatively low. The trolley frame 221 of the present invention adopts a double main beam structure, which reduces the height of the main beam while ensuring the strength of the main beam, which can reduce the space above the bridge frame 211 for the trolley to operate, and also make the space between the two main beams become the operating space of the movable pulley block, so that the upper limit of the main hook 261 can be located above the track surface of the trolley track, thereby increasing the lifting height of the main hook 261.

[0033] Figure 5 Schematically shows Figure 3 The swing reduction structure and principle of the bridge crane hook group are shown.

[0034] refer to Figure 5 As shown, both the fixed pulley group 241 and the movable pulley group 242 are arranged in two groups. With this structure, the principle is similar to that of two groups of pulley groups lifting heavy objects. When the heavy object does not deflect, the distance between the left fixed pulley group 2411 and the left movable pulley group 2421 is equal to the distance between the right fixed pulley group 2412 and the right movable pulley group 2422, both of which are H1. Assuming that the trolley starts to move backward or accelerate, due to inertia and the steel wire rope is a flexible element, after the steel wire rope deflects, an angle α is generated from the original vertical state. At this time, the left movable pulley block 2421 and the right movable pulley block 2422, which were originally at the same height, will have a height difference, that is, the originally horizontal axis connecting line OA of the left movable pulley block 2421 and the right movable pulley block 2422 rotates around point O to OB, so that the distance H2 between the right fixed pulley block 2412 and the right movable pulley block 2422 is greater than the distance H1 between the left fixed pulley block 2411 and the left movable pulley block 2421, that is, there is an angle β between OA and OB. Since the steel wire ropes on the left and right sides of the balance wheel 243 are the same steel wire rope, refer to Figure 5 As shown, and the lengths of both sides are kept equal through the balance wheel 243 in the middle, the friction between the wire rope and the fixed pulley block and the movable pulley block and the balancing effect of the balance wheel 243 can prevent the phenomenon that H2 is greater than or less than H1 from occurring, so this structural design can reduce the swing of the hook group during the movement of the trolley 21. In this embodiment, since the pulley axis directions of the left fixed pulley block 2411, the right fixed pulley block 2412 and the balance wheel 243 are perpendicular to the first main beam 251 and the second main beam 252, this structural design can reduce the swing of the hook group during the movement of the trolley 21. If the pulley axis directions of the left fixed pulley block 2411, the right fixed pulley block 2412 and the balance wheel 243 are parallel to the first main beam 251 and the second main beam 252, this structural design can reduce the swing of the hook group during the movement of the trolley 22.

[0035] The larger the installation spacing S between the two fixed pulley blocks, the greater the height difference between H2 and H1. Therefore, by increasing the installation spacing S value between the two fixed pulley blocks and using a multi-rate pulley block, the swing reduction effect can be better.

[0036] Figure 6-8 A hook assembly sway reduction structure of a bridge crane according to another embodiment of the present invention is schematically shown.

[0037] refer to Figure 6-8 As shown, the hook group sway reduction structure includes a telescopic rod 348 arranged on the top of the hanging plate 270 of the hook group, four displacement sensors 340 for detecting the position of the telescopic rod, and a control device and a driving device. The lower end of the telescopic rod 348 is fixedly connected to the top of the hanging plate 270, and the upper part is mounted on the telescopic rod mounting seat 343 through a spherical roller bearing 345. The telescopic rod mounting seat 343 is mounted on the balance wheel support 53 and is relatively fixed to the position of the trolley frame 221 of the bridge crane. The telescopic rod 348 can be retracted as the hook group is raised, and can also be extended as the hook group is lowered.

[0038] Four displacement sensors 340 are installed below the balance wheel support 53, evenly distributed on a circle with the telescopic rod 348 as the center, and one is arranged in each of the front, back, left, and right running directions of the crane trolley running mechanism and the trolley running mechanism, for detecting the displacement of the telescopic rod 348 in four directions. The displacement sensor 340 can be a device such as a proximity switch that can be used to detect the displacement of an object. In this embodiment, four displacement sensors 340 are used. In other embodiments, the number of displacement sensors 340 can also be set to three or six or other numbers as needed.

[0039] The displacement sensor 340 outputs the displacement data of the telescopic rod to the control device.

[0040] The control device 300 is used to determine the swing direction of the hook assembly according to the received displacement data and output a driving instruction to the driving device.

[0041] The drive device executes the drive instructions to drive the trolley or carriage of the bridge crane to decelerate or accelerate.

[0042] For example, when the displacement sensor 340 detects that the telescopic rod 348 moves backward, the displacement sensor 340 outputs the displacement data of the telescopic rod to the control device, and the control device determines that the hook group swings backward, indicating that the forward speed of the trolley 21 is too fast. The control device outputs a deceleration control instruction to the driving device of the trolley 21, and the driving device of the trolley 21 drives the trolley 21 to decelerate, and the swing amplitude of the hook group backward will be reduced. If the displacement sensor 340 detects that the telescopic rod 348 moves to the left or right, the swing of the hook group can be reduced by controlling the trolley travel mechanism to decelerate or accelerate.

[0043] The driving device can be a device such as an electric motor that can drive the large vehicle 21 or the small vehicle 22 to move.

[0044] The telescopic rod 348 is composed of four telescopic sections (3481, 3482, 3483, 3484) arranged from outside to inside, the first telescopic section 3481 at the outermost side includes an upper pressing plate 342, a steel pipe 346 and a lower pressing plate 341 connected in sequence from top to bottom, and each of the second telescopic section 3482, the third telescopic section 3483 and the fourth telescopic section 3484 is provided with an upper pressing plate 342, a sliding bearing 349, a connecting shaft 347, a steel pipe 346 and a lower pressing plate 341 in sequence from top to bottom. The steel pipe 346 can be a seamless steel pipe.

[0045] On the same expansion joint, the steel pipe 346 is fixedly connected to the lower end of the connecting shaft 347, the sliding bearing 349 is sleeved outside the connecting shaft 347, and the upper pressing plate 342 is connected to the upper end of the connecting shaft 347. The outer diameter of the upper pressing plate 342 is smaller than the outer diameter of the sliding bearing 349 and larger than the inner diameter of the sliding bearing 349. The inner diameter of the lower pressing plate 341 is consistent with the inner diameter of the steel pipe 346.

[0046] There is a gap of 2-3 mm between adjacent telescopic sections, and a gap of 1-2 mm between the sliding bearing 349 and the adjacent external telescopic section. When the inner telescopic section is eccentric or the hook group is deflected, the sliding bearing 349 slides in the steel pipe of the adjacent external telescopic section, reducing the sliding friction and the processing cost. A lower pressure plate 341 is provided at the bottom of each telescopic section, and the lower pressure plate 341 of the innermost telescopic section is connected to the bottom of the hanging plate by bolts.

[0047] The lower part of the lower pressing plate 341 of the first telescopic joint 3481, the second telescopic joint 3482 and the third telescopic joint 3483 is connected with a flange ring 3411. The inner diameter of the flange ring 3411 is larger than the outer diameter of the steel pipe 346 of the adjacent inner telescopic joint, and smaller than the outer diameter of the sliding bearing of the adjacent inner telescopic joint. The flange ring 3411 can prevent the adjacent telescopic joints from falling out.

[0048] A telescopic rod shaft 344 is welded to the outside of the steel pipe 346 of the first telescopic joint 3481 on the outermost side. The telescopic rod shaft 344 is mounted on the telescopic rod mounting seat 343 through a spherical roller bearing 345 .

[0049] When the hook group swings, since the lower end of the telescopic rod 348 is connected to the hanging plate 270 of the hook group by bolts, and the middle part of the telescopic rod 348 is fixed to the telescopic rod mounting seat 343 by the spherical roller bearing 348, the telescopic rod 348 can swing with the hook group. After swinging, the telescopic rod 348 swings to one side and the distance from the displacement sensor 340 becomes smaller. The displacement sensor 340 arranged on this side sends a sensing signal to the control device, and the PLC in the control device controls the trolley or car to decelerate in the opposite direction or accelerate in the same direction. For example, when the crane starts to move forward, due to inertia, the hook group swings backward, and the telescopic rod 348 generates a backward swing angle. The displacement sensor 340 located on the rear side senses the telescopic rod 348 and sends a signal. After the control device receives the signal, the PLC controls the trolley or car to decelerate forward or accelerate backward.

[0050] In this embodiment, the telescopic rod 348 has an outer diameter of 200 mm and is composed of four telescopic sections. The tail is equipped with a sliding mechanism. The gap between the inner and outer sections in the full length direction is small (2mm to 3mm). It is a rigid-flexible structure with a large slenderness ratio and can withstand a certain bending moment and lateral force. When the hook group or the weight swings, the telescopic rod 348 produces elastic deformation and forms a reverse force, which can prevent the hook group or the weight from swinging, thereby reducing the swing of the hook group. In other embodiments, the number of telescopic sections can be adjusted according to the lifting height of the hook group.

[0051] Figure 9-11 The frame structure of a trolley of a large-tonnage crane according to an embodiment of the present invention is schematically shown.

[0052] refer to Figure 9-11 As shown, the trolley frame 221 of the trolley includes a first main beam 251, a second main beam 252 and a supporting beam 253 which are parallel to each other, and two auxiliary beams 254 connecting the first main beam 251, the second main beam 252 and the supporting beam 253. A guardrail 74 is provided on the outer edge of the upper end of the first main beam 251. There is a certain gap between the first main beam 251 and the second main beam 252 for the wire rope or the hook group to pass through. A first through hole 2511 is provided in the middle of the first main beam 251, which is connected from top to bottom, for the wire rope of the main hoist of the crane to pass through during production.

[0053] A retractable guardrail 70 is provided on one side of the second main beam 252 close to the first main beam 251. The retractable guardrail 70 is L-shaped as a whole, including a handrail 71 and a retractable seat, the retractable seat including a bottom rod 72 connected to the handrail 71, and a base 73 provided on the second main beam 252. The base 73 is hollow, and the bottom rod 72 is inserted into the base 73. Fig. 9 As shown, when the crane is in the construction state, the main hoisting device is installed in the first installation position, and the bottom rod 72 can be pulled out from the base 73 toward the direction of the first main beam 251. Fig.10 As shown, when the crane is in production state, the main hoisting device is installed in the second installation position, and the bottom rod 72 can be pushed toward the second main beam 252, so that the handrail 71 of the retractable guardrail 70 will not interfere with the main hoist drum 23.

[0054] The supporting beam 253 abuts against the second main beam 252 , and a second through hole 2531 penetrating from top to bottom is provided on the supporting beam 253 , and the second through hole 2531 is for the steel wire rope of the small winch to pass through.

[0055] The two ends of the main beam of the traditional trolley frame are overlapped on the upper end of the secondary beam, so that the overall height of the trolley frame is relatively high. Due to the size limitation of the use scenario of the bridge crane of the present invention in the tunnel, the height of the trolley frame needs to be as small as possible. Fig.11 As shown, both ends of the first main beam 251 and the second main beam 252 of the main trolley of the bridge crane of the present invention are inserted into the auxiliary beam 254 and welded with the auxiliary beam 254. In this way, the height of the trolley frame 221 of the present invention can be reduced by half compared with the height of the traditional trolley frame.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A swing reduction device for a bridge crane hook assembly, characterized in that: It includes a telescopic rod and a plurality of displacement sensors, as well as a control device and a driving device; The lower end of the telescopic rod is arranged on the top of the hanging plate of the hook group, and the upper part is installed on the telescopic rod mounting seat through a spherical roller bearing; the telescopic rod mounting seat is arranged on the trolley frame of the bridge crane; The displacement sensor is arranged on the trolley frame of the bridge crane, evenly arranged on the circumference of the circle with the telescopic rod as the center, and is used to detect the position of the telescopic rod and output the displacement data of the telescopic rod to the control device; The control device is used to determine the swing direction of the hook group according to the received multiple displacement data, and output a driving instruction to the driving device; The drive device executes the drive command to drive the trolley or carriage of the bridge crane to slow down or accelerate; The telescopic rod includes a plurality of telescopic joints sleeved from the outside to the inside, the outermost telescopic joint includes an upper pressing plate, a steel pipe and a lower pressing plate, and each internal telescopic joint includes an upper pressing plate, a sliding bearing, a connecting shaft, a steel pipe and a lower pressing plate arranged in sequence from top to bottom; On the same expansion joint, the steel pipe is fixedly connected to the lower end of the connecting shaft, the sliding bearing sleeve is arranged outside the connecting shaft, and the upper pressure plate is connected to the upper end of the connecting shaft; the outer diameter of the sliding bearing is larger than the outer diameter of the steel pipe; the outer diameter of the upper pressure plate is smaller than the outer diameter of the sliding bearing and larger than the inner diameter of the sliding bearing; the inner diameter of the lower pressure plate is consistent with the inner diameter of the steel pipe; the lower part of the lower pressure plate is connected to a flange ring, the inner diameter of the flange ring is larger than the outer diameter of the steel pipe of the adjacent inner expansion joint, and smaller than the outer diameter of the sliding bearing of the adjacent inner expansion joint; There is a gap between adjacent expansion joints. The gap between the sliding bearing on the inner expansion joint and its adjacent outer expansion joint is smaller than the gap between the steel pipes. When the inner expansion joint is eccentric or the hook is deflected, the sliding bearing slides in the steel pipe of the adjacent outer expansion joint.

2. The anti-sway device according to claim 1, characterized in that: The gap between the steel pipes of adjacent expansion joints is 2-3 mm.

3. The anti-sway device according to claim 1, characterized in that: The clearance between the sliding bearing and the adjacent outer expansion joint is 1-2 mm.

4. The anti-sway device according to any one of claims 1 to 3, characterized in that: A telescopic rod shaft is welded to the outside of the outermost telescopic joint, and the telescopic rod shaft is mounted on the telescopic rod mounting seat through a spherical roller bearing.

5. The anti-sway device according to any one of claims 1 to 3, characterized in that: It also includes a winding structure of a wire rope of a winch device, as well as a left fixed pulley block, a right fixed pulley block, a left movable pulley block, a right movable pulley block and a balance wheel; The two ends of the wire rope are respectively fixed to the two ends of the drum of the hoisting device, and the middle of the wire rope is hung on the balance wheel to form the balance wheel section; The left section of the wire rope includes a left winding section passing around the left section of the main winch drum, a left fixed pulley section passing around the left fixed pulley block, and a left movable pulley section passing around the left movable pulley block; The right section of the wire rope includes a right movable pulley section bypassing a right movable pulley block, a right fixed pulley section bypassing a right fixed pulley block, and a right winding section bypassing a right section of a main winch drum.

6. The anti-sway device according to claim 5, characterized in that: The trolley frame is in the shape of a rectangular frame as a whole, and includes two first main beams and a second main beam arranged in parallel; The two ends of the supports of the left fixed pulley block, the right fixed pulley block and the balance wheel are respectively supported above the first main beam and the second main beam, and the pulley shaft directions of the left fixed pulley block, the right fixed pulley block and the balance wheel are perpendicular to the first main beam and the second main beam.

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