Lifting appliance anti-swing device and crane

Abstract

The utility model relates to the field of hoisting equipment, and provides a lifting appliance anti-swing device and a crane, the lifting appliance anti-swing device comprises a first connecting rope, a second connecting rope and a telescopic arm, the telescopic arm comprises a first pipe body, a second pipe body and a third pipe body which are sequentially nested, the first pipe body is used for being fixedly connected with a crane body, and the second pipe body is used for being fixedly connected with the crane body. The third pipe body is used for being fixedly connected with a lifting appliance of the crane so as to guide the lifting appliance to ascend or descend in the vertical direction. One end of the first connecting rope is fixedly connected with the first pipe body, and the other end of the first connecting rope penetrates through the pipe wall of the second pipe body, is fixedly connected with the third pipe body and is used for driving the second pipe body to synchronously descend when the third pipe body descends along with the lifting appliance; one end of the second connecting rope is fixedly connected with the first pipe body, and the other end of the second connecting rope penetrates through the pipe wall of the second pipe body, is fixedly connected with the third pipe body and is used for driving the second pipe body to synchronously ascend when the third pipe body ascends along with the lifting appliance. The lifting appliance anti-swing device is simple in structure, small in occupied space and good in universality.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a spreader anti-sway device and a crane. Background Art

[0002] In the field of lifting equipment, a crane lifts and transports heavy objects to the current area through a spreader. Since the spreader is flexibly connected to the body of the crane by a suspension rope, the spreader is extremely likely to shake during the lifting process, thereby affecting the stability and balance of the heavy object transportation.

[0003] Currently, there are mainly three forms of anti-sway control for cranes: one is electric control anti-sway, which reduces the sway of the spreader caused by running inertia by controlling the speed change of the crane's braking. This method is only applicable to small cranes and has poor anti-sway effect when lifting heavy objects too heavy; the second is high-position guide column anti-sway, where an anti-sway guide column is set at the bottom of the crane. When the spreader rises to a high position, it is connected to the anti-sway guide column, so that the spreader can avoid shaking during operation. This method can only maintain the stable state of the spreader at a high position, and there is still shaking during the rising and falling process of the spreader; the third is to use a telescopic boom for anti-sway. However, most of the current rigid telescopic booms have complex and cumbersome structures, are relatively heavy, and the cross-section changes relatively large between multiple telescopic booms, especially not suitable for scenarios with a relatively high lifting height. Summary of the Invention

[0004] The utility model provides a spreader anti-sway device and a crane, which are used to solve the problems that the existing spreader anti-sway device is heavy, has a complex and cumbersome structure, occupies a large space, is difficult to be applicable to application scenarios with a relatively large lifting height, and cannot ensure the universality of the spreader anti-sway device.

[0005] In a first aspect, the utility model provides a spreader anti-sway device, including: a first connecting rope, a second connecting rope and a telescopic boom. The telescopic boom includes a first pipe body, a second pipe body and a third pipe body nested in sequence. The first pipe body is used for fixedly connecting with the body of the crane, and the third pipe body is used for fixedly connecting with the spreader of the crane to guide the spreader to rise or fall in the vertical direction;

[0006] One end of the first connecting rope is fixedly connected with the first pipe body, and the other end passes through the pipe wall of the second pipe body and is fixedly connected with the third pipe body. The connection part of the first connecting rope and the second pipe body is higher than both ends of the first connecting rope, and is used to drive the second pipe body to descend synchronously when the third pipe body follows the spreader to descend;

[0007] One end of the second connecting rope is fixedly connected to the first pipe body, and the other end passes through the pipe wall of the second pipe body and is fixedly connected to the third pipe body. The connection point of the second connecting rope and the second pipe body is lower than both ends of the second connecting rope, and is used to drive the second pipe body to rise synchronously when the third pipe body rises following the spreader.

[0008] A spreader anti-sway device according to the present invention further includes a first pulley, which is rotatably installed at the connection of the second pipe body and the first connecting rope, and the first connecting rope is laid on the first pulley.

[0009] A spreader anti-sway device according to the present invention further includes a second pulley, which is rotatably installed at the connection of the second pipe body and the second connecting rope. The second pulley is lower than the first pulley, and the second connecting rope is laid on the second pulley.

[0010] A spreader anti-sway device according to the present invention further includes a bearing seat. The first pulley and the second pulley are respectively rotatably installed on the second pipe body through a bearing seat.

[0011] A spreader anti-sway device according to the present invention, the first pipe body has an ear, the ear is located at the bottom end of the first pipe body, the first connecting rope and the second connecting rope are respectively provided with locking holes, and the ear is inserted into the locking holes.

[0012] A spreader anti-sway device according to the present invention, there are two sets of the first pulley, the second pulley, the first connecting rope and the second connecting rope, and the two sets of the first pulley, the second pulley, the first connecting rope and the second connecting rope are symmetrically arranged on the opposite sides of the telescopic arm along the axis of the telescopic arm.

[0013] A spreader anti-sway device according to the present invention further includes a first guiding wheel group, the first guiding wheel group includes a plurality of first guiding wheels, the first guiding wheels are hinged to the first pipe body and are in rolling contact with the second pipe body, and the plurality of first guiding wheels are arranged at intervals along the circumferential direction of the first pipe body, and the second pipe body is clamped between the plurality of first guiding wheels.

[0014] A spreader anti-sway device according to the present invention further includes a second guiding wheel group, the second guiding wheel group includes a plurality of second guiding wheels, the second pipe body is provided with a slide rail extending in the vertical direction, each second guiding wheel is slidably arranged on a slide rail and is in rolling contact with the third pipe body, and the plurality of second guiding wheels are arranged at intervals along the circumferential direction of the second pipe body, and the third pipe body is clamped between the plurality of second guiding wheels.

[0015] According to a sling anti-sway device provided by the present utility model, there are multiple groups of the first guide wheel sets, and the multiple groups of the first guide wheel sets are arranged at intervals along the axial direction of the first pipe body;

[0016] There are multiple groups of the second guide wheel sets, and the multiple groups of the second guide wheel sets are arranged at intervals along the axial direction of the second pipe body.

[0017] In a second aspect, the present utility model further provides a crane, which includes a body, a winch, a hoisting rope, a sling, and the sling anti-sway device according to any one of the above. The winch is installed on the body, the hoisting rope is wound around the winch, and the hoisting rope is fixedly connected to the sling to drive the sling to lift and lower; the third pipe body is fixedly connected to the sling and is used to guide the sling to lift and lower in the vertical direction.

[0018] The present utility model provides a sling anti-sway device and a crane. The telescopic arm includes a first pipe body, a second pipe body, and a third pipe body nested in sequence. The first pipe body is used to be fixedly connected to the body of the crane, and the third pipe body is used to be fixedly connected to the sling of the crane to guide the sling to rise or fall in the vertical direction; one end of the first connecting rope is fixedly connected to the first pipe body, and the other end passes through the pipe wall of the second pipe body and is fixedly connected to the third pipe body. The connection part of the first connecting rope and the second pipe body is higher than both ends of the first connecting rope, so that when the third pipe body follows the sling to descend, it drives the second pipe body to descend synchronously; one end of the second connecting rope is fixedly connected to the first pipe body, and the other end passes through the pipe wall of the second pipe body and is fixedly connected to the third pipe body. The connection part of the second connecting rope and the second pipe body is lower than both ends of the second connecting rope, so that when the third pipe body follows the sling to rise, it drives the second pipe body to rise synchronously. The sling anti-sway device provided by the present utility model has a simple structure, occupies a small space, can be applicable to application scenarios with a relatively large hoisting height, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is one of the overall structural schematic diagrams of the sling anti-sway device provided by the present utility model.

[0021] Figure 2 is the second of the overall structural schematic diagrams of the sling anti-sway device provided by the present utility model.

[0022] Figure 3 is one of the partial structural schematic diagrams of the sling anti-sway device provided by the present utility model.

[0023] Figure 4 It is the second partial structural schematic diagram of the anti-sway device for the spreader provided by the present utility model.

[0024] Figure 5 It is the third partial structural schematic diagram of the anti-sway device for the spreader provided by the present utility model.

[0025] Reference numerals:

[0026] 1. First connecting rope; 2. Second connecting rope; 3. Telescopic arm; 4. First pulley; 5. Second pulley; 6. First guide wheel group; 7. Second guide wheel group; 100. Spreader; 11. Lock hole; 31. First pipe body; 32. Second pipe body; 33. Third pipe body; 311. Ear; 321. Slide rail; 61. First guide wheel; 71. Second guide wheel. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without any creative work shall fall within the protection scope of the present utility model.

[0028] The terms "first" and "second" in the description and claims of the present utility model may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally means that the related objects before and after are in an "or" relationship.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] The following Figures 1 - 5 , through specific embodiments and their application scenarios, will elaborate in detail on a spreader anti-sway device and a crane provided by the embodiments of the present utility model.

[0032] In view of the problems that the spreader anti-sway device in the prior art is heavy, has a complex and cumbersome structure, occupies a large space, is difficult to be applicable to application scenarios with a relatively large lifting height, and cannot ensure the universality of the spreader anti-sway device, on the first hand, as Figure 1 and Figure 2 shown, the present utility model provides a spreader anti-sway device, including: a first connecting rope 1, a second connecting rope 2, and a telescopic arm 3. The telescopic arm 3 includes a first pipe body 31, a second pipe body 32, and a third pipe body 33 nested in sequence. The first pipe body 31 is used for fixedly connecting with the body of the crane. The third pipe body 33 is used for fixedly connecting with the spreader 100 of the crane to guide the spreader 100 to rise or fall in the vertical direction.

[0033] As Figure 3 shown, one end of the first connecting rope 1 is fixedly connected with the first pipe body 31, and the other end passes through the pipe wall of the second pipe body 32 and is fixedly connected with the third pipe body 33. The connection part of the first connecting rope 1 and the second pipe body 32 is higher than both ends of the first connecting rope 1, and is used for driving the second pipe body 32 to descend synchronously when the third pipe body 33 follows the spreader 100 to descend.

[0034] As Figure 3 shown, one end of the second connecting rope 2 is fixedly connected with the first pipe body 31, and the other end passes through the pipe wall of the second pipe body 32 and is fixedly connected with the third pipe body 33. The connection part of the second connecting rope 2 and the second pipe body 32 is lower than both ends of the second connecting rope 2, and is used for driving the second pipe body 32 to rise synchronously when the third pipe body 33 follows the spreader 100 to rise.

[0035] It can be understood that the first pipe body 31, the second pipe body 32, and the third pipe body 33 are all arranged vertically. The top of the first pipe body 31 can be fixedly installed on the body of the crane through fasteners such as bolts. The first pipe body 31, the second pipe body 32, and the third pipe body 33 are nested in sequence from top to bottom, so that the second pipe body 32 and the third pipe body 33 can move relative to the first pipe body 31.

[0036] Specifically, as Figure 1 and Figure 2 shown, the bottom end of the third pipe body 33 is connected to the sling 100. The sling 100 is connected to the body of the crane through a lifting rope. Driven by the body, the lifting rope can drive the sling 100 to rise or fall. Since the third pipe body 33 is fixedly connected to the sling 100, the third pipe body 33 can move vertically following the sling 100.

[0037] To enable the second pipe body 32 and the third pipe body 33 to rise or fall synchronously following the sling 100, specifically, as Figure 3 shown, the top of the second pipe body 32 is embedded in the first pipe body 31. The top of the third pipe body 33 is embedded in the second pipe body 32. A part of the first connecting rope 1 is accommodated in the first pipe body 31, and the other part is accommodated in the second pipe body 32. One end of the first connecting rope 1 is fixed to the bottom end of the first pipe body 31, and the other end passes through the top end of the second pipe body 32 and is fixedly connected to the top end of the third pipe body 33. Thus, when the sling 100 moves downward, the sling 100 drives the third pipe body 33 to move vertically downward. Under the action of the first connecting rope 1, the third pipe body 33 drives the second pipe body 32 to descend synchronously. Since the sling 100 and the telescopic arm 3 are rigidly connected, the third pipe body 33 can guide the sling 100 to descend vertically, thereby preventing the sling 100 from shaking.

[0038] Furthermore, one end of the second connecting rope 2 is fixed to the bottom end of the first pipe body 31, and the other end passes through the bottom end of the second pipe body 32 and is fixedly connected to the top end of the third pipe body 33. Thus, when the sling 100 moves upward, the sling 100 drives the third pipe body 33 to move upward. Under the action of the second connecting rope 2, the third pipe body 33 drives the second pipe body 32 to rise synchronously. Since the sling 100 and the third pipe body 33 are rigidly connected, the second pipe body 32 and the third pipe body 33 can guide the sling 100 to rise vertically, thereby preventing the sling 100 from shaking.

[0039] The present utility model provides an anti-sway device for a spreader. The telescopic boom 3 includes a first pipe body 31, a second pipe body 32, and a third pipe body 33 that are nested in sequence. The first pipe body 31 is used for fixedly connecting to the body of the crane, and the third pipe body 33 is used for fixedly connecting to the spreader 100 of the crane to guide the spreader 100 to rise or fall in the vertical direction; one end of the first connecting rope 1 is fixedly connected to the first pipe body 31, and the other end passes through the pipe wall of the second pipe body 32 and is fixedly connected to the third pipe body 33. The connection point of the first connecting rope 1 and the second pipe body 32 is higher than both ends of the first connecting rope 1, so that when the third pipe body 33 follows the spreader 100 to descend, it drives the second pipe body 32 to descend synchronously; one end of the second connecting rope 2 is fixedly connected to the first pipe body 31, and the other end passes through the pipe wall of the second pipe body 32 and is fixedly connected to the third pipe body 33. The connection point of the second connecting rope 2 and the second pipe body 32 is lower than both ends of the second connecting rope 2, so that when the third pipe body 33 follows the spreader 100 to rise, it drives the second pipe body 32 to rise synchronously. The anti-sway device for the spreader provided by the present utility model has a simple structure, occupies a small space, can be applied to application scenarios with a relatively large lifting height, and has good versatility.

[0040] Specifically, in some embodiments, as Figure 3 shown, the anti-sway device for the spreader further includes a first pulley 4. The first pulley 4 is rotatably installed at the connection point of the second pipe body 32 and the first connecting rope 1. The first connecting rope 1 is arranged on the first pulley 4.

[0041] It can be understood that the first pulley 4 is rotatably installed at the top of the second pipe body 32. The first connecting rope 1 is arranged on the first pulley 4 to guide the first connecting rope 1 through the first pulley 4 to drive the second pipe body 32 to descend synchronously with the third pipe body 33.

[0042] Furthermore, in some embodiments, as Figure 3 shown, the anti-sway device for the spreader further includes a second pulley 5. The second pulley 5 is rotatably installed at the connection point of the second pipe body 32 and the second connecting rope 2. The second pulley 5 is lower than the first pulley 4, and the second connecting rope 2 is arranged on the second pulley 5.

[0043] It can be understood that the second pulley 5 is rotatably installed at the bottom of the second pipe body 32. The second connecting rope 2 is arranged on the second pulley 5 to guide the second connecting rope 2 through the second pulley 5 to drive the second pipe body 32 to rise synchronously with the third pipe body 33.

[0044] Optionally, the anti-sway device for the spreader further includes a bearing seat. The first pulley 4 and the second pulley 5 are respectively rotatably installed on the outer wall of the second pipe body 32 through a bearing seat, so that the first pulley 4 and / or the second pulley 5 can rotate relative to the second pipe body 32, thereby guiding the first connecting rope 1 and / or the second connecting rope 2 to drive the second pipe body 32 to rise or fall synchronously with the third pipe body 33.

[0045] The first pipe body 31 has an ear 311. The ear 311 is located at the bottom end of the first pipe body 31. The first connecting rope 1 and the second connecting rope 2 are respectively provided with locking holes 11, and the ear 311 is inserted into the locking holes 11.

[0046] Specifically, in some embodiments, as Figure 4 shown, the ear 311 and the first pipe body 31 may be integrally connected. The ear 311 protrudes from the outer wall of the first pipe body 31 and is located at the bottom end of the first pipe body 31, so that the ear 311 can pass through the locking holes 11 of the first connecting rope 1 and the locking holes 11 of the second connecting rope 2, thereby firmly fixing one end of the first connecting rope 1 away from the third pipe body 33 and one end of the second connecting rope 2 away from the third pipe body 33 at the bottom end of the first pipe body 31.

[0047] In some embodiments, as Figure 3 shown, there are two sets of the first pulley 4, the second pulley 5, the first connecting rope 1 and the second connecting rope 2 provided as a set. The two sets of the first pulley 4, the second pulley 5, the first connecting rope 1 and the second connecting rope 2 are symmetrically arranged on the opposite sides of the telescopic arm 3 along the axis of the telescopic arm 3.

[0048] It can be understood that the two sets of the first pulley 4, the second pulley 5, the first connecting rope 1 and the second connecting rope 2 are all vertically arranged. The telescopic arm 3 is clamped between the two sets of the first pulley 4, the second pulley 5, the first connecting rope 1 and the second connecting rope 2 to improve the stability of the movement of the telescopic arm 3, and further ensure that the lifting tool 100 can move up and down along the vertical direction and prevent the lifting tool 100 from shaking.

[0049] In some embodiments, as Figure 1 and Figure 2 shown, the anti-sway device of the lifting tool further includes a first guide wheel set 6. The first guide wheel set 6 includes a plurality of first guide wheels 61. The first guide wheels 61 are hinged to the first pipe body 31 and are in rolling contact with the second pipe body 32. The plurality of first guide wheels 61 are circumferentially spaced along the inner wall of the first pipe body 31, and the second pipe body 32 is clamped between the plurality of first guide wheels 61.

[0050] It can be understood that the first guide wheel set 6 is located at one end of the first pipe body 31 close to the second pipe body 32. The plurality of first guide wheels 61 are arranged in a ring shape. The plurality of first guide wheels 61 are circumferentially arranged along the inner wall of the first pipe body 31. Each first guide wheel 61 is rotatably mounted on the inner wall of the first pipe body 31 through a bearing, so that the second pipe body 32 is clamped between the plurality of first guide wheels 61 and is in rolling contact with the first guide wheels 61. The first guide wheel set 6 is used to guide the second pipe body 32 to move up and down relative to the first pipe body 31 in the vertical direction and enable the second pipe body 32 to be centered inside the first pipe body 31, ensuring that the second pipe body 32 always remains flush with the vertical direction during the movement process.

[0051] In some embodiments, as Figure 1 , Figure 2 and Figure 5 shown, the anti-sway device of the spreader further includes a second guide wheel set 7. The second guide wheel set 7 includes a plurality of second guide wheels 71. The second pipe body 32 is provided with a slide rail 321 extending in the vertical direction. Each second guide wheel 71 is slidably disposed on a slide rail 321 and is in rolling contact with the third pipe body 33. The plurality of second guide wheels 71 are circumferentially spaced along the second pipe body 32, and the third pipe body 33 is clamped between the plurality of second guide wheels 71.

[0052] It can be understood that the second guide wheel set 7 is located at one end of the second pipe body 32 close to the third pipe body 33. The plurality of second guide wheels 71 are arranged in a ring shape. The plurality of second guide wheels 71 are circumferentially arranged along the inner wall of the second pipe body 32. The slide rail 321 is fixed to the inner wall of the second pipe body 32 and extends in the vertical direction. The plurality of slide rails 321 are circumferentially spaced along the inner wall of the second pipe body 32. Each second guide wheel 71 is slidably mounted on a slide rail 321. The third pipe body 33 is clamped between the plurality of second guide wheels 71 and is in rolling contact with the second guide wheels 71. The second guide wheel set 7 is used to guide the third pipe body 33 and the second pipe body 32 to be able to lift and lower synchronously, and to make the third pipe body 33 be centered inside the second pipe body 32, ensuring that the third pipe body 33 always remains flush with the vertical direction during the movement.

[0053] Furthermore, as Figure 2 shown, there are multiple groups of the first guide wheel set 6. The multiple groups of the first guide wheel set 6 are axially spaced along the first pipe body 31. The first guide wheel 61 of each group of the first guide wheel set 6 is in rolling contact with the second pipe body 32 to limit the second pipe body 32 to the central position inside the second pipe body 32 and prevent the second pipe body 32 from being skewed; at the same time, the multiple groups of the first guide wheel set 6 simultaneously guide the second pipe body 32 to lift and lower relative to the first pipe body 31, improving the flexibility of the telescopic movement of the telescopic arm 3.

[0054] As Figure 2 shown, there are multiple groups of the second guide wheel set 7. The multiple groups of the second guide wheel set 7 are axially spaced along the second pipe body 32. The second guide wheel 71 of each group of the second guide wheel set 7 is in rolling contact with the third pipe body 33 to limit the third pipe body 33 to the central position inside the second pipe body 32 and prevent the third pipe body 33 from being skewed; at the same time, the multiple groups of the second guide wheel set 7 simultaneously guide the third pipe body 33 to drive the second pipe body 32 to lift and lower synchronously, improving the flexibility of the telescopic movement of the telescopic arm 3.

[0055] In a second aspect, the present utility model further provides a crane, which includes a body, a hoist, a lifting rope, a spreader 100, and the spreader anti-sway device as described above. The hoist is installed on the body, the lifting rope is wound around the hoist, and the lifting rope is fixedly connected to the spreader 100 to drive the spreader 100 to lift and lower. The third pipe body 33 is fixedly connected to the spreader 100 and is used to guide the spreader 100 to lift and lower in the vertical direction.

[0056] It can be understood that the spreader 100 is connected to the hoist through the lifting rope. The hoist is fixed to the body and is used to drive the lifting rope to wind or unwind, so as to drive the spreader 100 to lift and lower through the lifting rope. The third pipe body 33 is fixed to the spreader 100 and guides the spreader 100 to rise or fall in the vertical direction through the above-mentioned spreader anti-sway device, thereby preventing the spreader 100 from shaking and ensuring the stability and balance of the spreader 100 when lifting heavy objects.

[0057] Since the crane includes the spreader anti-sway device, and the specific structure of the spreader anti-sway device refers to the above-mentioned embodiment, the crane of this embodiment includes all the technical solutions of the above-mentioned embodiment. Therefore, it has at least all the beneficial effects obtained by all the technical solutions of the above-mentioned embodiment, which will not be elaborated here one by one.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A sling anti-sway device, characterized in that: include: A first connecting rope, a second connecting rope and a telescopic arm, wherein the telescopic arm comprises a first tube body, a second tube body and a third tube body which are nested in sequence, wherein the first tube body is used to be fixedly connected to a body of the crane, and the third tube body is used to be fixedly connected to a sling of the crane to guide the sling to rise or fall in a vertical direction; One end of the first connecting rope is fixedly connected to the first tube body, and the other end is passed through the tube wall of the second tube body and fixedly connected to the third tube body. The connection between the first connecting rope and the second tube body is higher than the two ends of the first connecting rope, and is used to drive the second tube body to descend synchronously when the third tube body follows the sling to descend; One end of the second connecting rope is fixedly connected to the first tube body, and the other end passes through the tube wall of the second tube body and is fixedly connected to the third tube body. The connection between the second connecting rope and the second tube body is lower than the two ends of the second connecting rope, and is used to drive the second tube body to rise synchronously when the third tube body rises with the hoist.

2. The anti-sway device for slings according to claim 1, characterized in that: It also includes a first pulley, which is rotatably installed at the connection between the second tube body and the first connecting rope, and the first connecting rope is draped over the first pulley.

3. The anti-sway device for slings according to claim 2, characterized in that: It also includes a second pulley, which is rotatably installed at the connection between the second tube body and the second connecting rope, the second pulley is lower than the first pulley, and the second connecting rope is draped on the second pulley.

4. The anti-sway device for slings according to claim 3, characterized in that: It also includes a bearing seat, and the first pulley and the second pulley are rotatably mounted on the second tube body through the bearing seat respectively.

5. The anti-sway device for slings according to claim 1, characterized in that: The first tube body has a support ear, and the support ear is located at the bottom end of the first tube body. The first connecting rope and the second connecting rope are respectively provided with a locking hole, and the support ear is inserted into the locking hole.

6. The anti-sway device for slings according to claim 3 or 4, characterized in that: The first pulley, the second pulley, the first connecting rope and the second connecting rope are provided in two sets, and the two sets of the first pulley, the second pulley, the first connecting rope and the second connecting rope are symmetrically arranged on opposite sides of the telescopic arm along the axis of the telescopic arm.

7. The anti-sway device for slings according to claim 1, characterized in that: It also includes a first guide wheel group, which includes a plurality of first guide wheels. The first guide wheels are hinged to the first tube body and in rolling contact with the second tube body. The plurality of first guide wheels are arranged at intervals along the circumference of the first tube body, and the second tube body is clamped between the plurality of first guide wheels.

8. The anti-sway device for slings according to claim 7, characterized in that: It also includes a second guide wheel group, which includes a plurality of second guide wheels. The second tube body is provided with a slide rail extending in a vertical direction. Each of the second guide wheels is slidably arranged on one of the slide rails and is in rolling contact with the third tube body. The plurality of second guide wheels are arranged at intervals along the circumference of the second tube body, and the third tube body is clamped between the plurality of second guide wheels.

9. The anti-sway device for slings according to claim 8, characterized in that: The first guide wheel group comprises a plurality of groups, and the plurality of groups of the first guide wheel groups are arranged at intervals along the axial direction of the first tube body; The second guide wheel groups include a plurality of groups, and the plurality of groups of the second guide wheel groups are arranged at intervals along the axial direction of the second tube body.

10. A crane, characterized in that: It comprises a machine body, a winch, a lifting rope, a sling and a sling anti-sway device as described in any one of claims 1 to 9, wherein the winch is installed on the machine body, the lifting rope is wound around the winch, the lifting rope and the sling are fixedly connected to drive the sling to rise and fall; the third tube body is fixedly connected to the sling to guide the sling to rise and fall in the vertical direction.

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