Adjustable damping vibration reduction device for long sling and installation method thereof

Abstract

The present application discloses an adjustable damping vibration reduction device for a long sling and an installation method thereof, and relates to the technical field of damping vibration reduction. An adjustable damping vibration reduction device for a long sling comprises a triangular support frame arranged at the proximal end of the sling, and the adjustable damping vibration reduction device also comprises: a vibration reduction box body, which is arranged horizontally between two slings; the vibration reduction box body is provided with vibration dampers of more than two frequency ranges; the two side end surfaces of the vibration reduction box body are provided with crawling devices for clamping the sling; a telescopic screw rod for providing push-pull force to the vibration reduction box body, the bottom end of which is fixed to the triangular support frame, and the top end of which is fixed to the vibration reduction box body. The present application discloses an installation method based on the above-mentioned adjustable damping vibration reduction device. In the adjustable damping vibration reduction device and the installation method thereof of the present application, the damper is no longer installed at the proximal end of the sling, and its position on the sling is adjustable, and acts on multi-order modal vibrations.

Description

Technical Field

[0001] The present application relates to the technical field of damping and vibration reduction, and in particular to an adjustable damping and vibration reduction device for a long sling and an installation method thereof. Background Art

[0002] As the span of suspension bridges increases, the cables of suspension bridges are getting longer and longer. The cables are affected by external wind loads and traffic loads, which may cause large vibrations. In addition, the suspension bridge cables themselves have low damping, and it is difficult to control the vibration of the cables. At present, the vibration of the cables is generally controlled by adding damping and vibration reduction devices. However, the damping and vibration reduction devices are generally installed at the near end of the cables, which often cannot achieve effective vibration reduction effects.

[0003] In view of the above problems, those skilled in the art have designed a long-cable damping vibration reduction device for a suspension bridge such as CN108660904A. The technical solution of this invention patent is to set a rigid connector, a displacement transmission rod and a damper; the damper is installed at the proximal end of the cable, the rigid connector is fixedly connected to the two cables, and the proximal end of the spaced cable is set upward; the top of the displacement transmission rod is hinged to the rigid hinge, and the bottom of the displacement transmission rod is connected to the damper. The technical solution of the present invention amplifies the vibration of the cable to the bottom of the displacement transmission rod through the support frame and the displacement transmission rod, so that the damper can fully play the vibration reduction role, which is equivalent to moving the position of the receiving vibration reduction point upward, and the vibration reduction effect is better than that of the vibration reduction damper installed at the proximal end.

[0004] However, the above technical solution still has defects. The first point is that the above damping and vibration reduction device is of a fixed type, and the installation position is unrelated to the amplitude of the sling, and the best vibration reduction effect cannot be achieved; the second point is that the damper is still located at the proximal end of the sling, and requires transmission through rigid connectors and displacement transmission rods. Part of the vibration will be lost during the transmission process, and the lost part still needs to be borne by the sling itself; the third point is that the above damping and vibration reduction device is defective in controlling the wind-induced vibration of the sling, mainly because the vibration frequency of the wind-induced vibration is broadband, while the frequency of the fixed damping and vibration reduction device to prevent vibration is narrowband, and multi-order modal vibration cannot be controlled. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present application is to provide an adjustable damping vibration reduction device for a long sling and an installation method thereof, in which the damper is no longer installed at the proximal end of the sling, its position on the sling is adjustable, and it acts on multi-order modal vibrations.

[0006] In order to achieve the above purpose, the technical solution adopted is: an adjustable damping vibration reduction device for a long sling, comprising a triangular support frame arranged at the proximal end of the sling, and the adjustable damping vibration reduction device also includes:

[0007] A vibration-damping box body is transversely arranged between two slings; the vibration-damping box body is provided with vibration absorbers of two or more frequency ranges; and the two side end surfaces of the vibration-damping box body are provided with crawling devices for clamping the slings;

[0008] The telescopic screw rod is used for providing push and pull force for the vibration reduction box body, wherein the bottom end thereof is fixed to the triangular support frame, and the top end thereof is fixed to the vibration reduction box body.

[0009] Based on the above technical solution, the adjustable damping vibration reduction device also includes a screw driver and a screw nut. The screw driver is arranged inside the triangular support frame, and the screw nut is arranged at the top of the triangular support frame. The telescopic screw passes through the top of the triangular support frame and the screw nut. The screw driver is used to control the extension or shortening of the telescopic screw.

[0010] Based on the above technical solution, the length of the vibration damping box is smaller than the spacing between the two slings, and a cross bar and two matching meshing bevel gears are arranged inside the box, one meshing bevel gear is arranged at the top of the telescopic screw, and the other meshing bevel gear is arranged on the cross bar; when the telescopic screw rotates, the cross bar is driven to rotate by the two meshing bevel gears, thereby driving the crawling device to crawl along the sling.

[0011] On the basis of the above technical solution, the crawling device includes a connecting rod, two flat gears and two arc pulleys. The first flat gear is close to the side end face of the shock-absorbing box body and is coaxially arranged therewith; the second flat gear is meshed with the first flat gear; the sliding grooves of the two arc pulleys are respectively clamped on both sides of the sling, and one of the arc pulleys is coaxially close to the side end face of the second flat gear; the connecting rod is vertically connected to the rotating shaft of the two arc pulleys; when the cross bar rotates, the first flat gear rotates, and the two arc pulleys clamp the sling and rotate to crawl.

[0012] On the basis of the above technical solution, the shock absorber includes a liquid mass shock absorber, a spring mass shock absorber, a pulley mass shock absorber and / or an inertial shock absorber.

[0013] On the basis of the above technical solution, the triangular support frame includes a horizontal frame and two diagonal braces, two ends of the horizontal frame are respectively clamped with two slings, and the two diagonal braces are obliquely arranged to form a triangular structure.

[0014] The present application discloses an installation method based on the above-mentioned adjustable damping vibration reduction device, comprising the following steps:

[0015] Use the testing instrument to test the environmental excitation time history curve of the sling before installing the adjustable damping vibration reduction device to obtain the vibration frequency of the sling;

[0016] The bottom end of the telescopic screw is fixed to the triangular support frame, and the vibration reduction box is installed on the top of the telescopic screw; crawling devices are installed on both side end surfaces of the vibration reduction box; vibration absorbers with more than two frequency ranges are installed on the vibration reduction box, and the natural frequencies of all vibration absorbers are within the vibration frequency range of the suspension seat;

[0017] The environmental excitation time-history curve after the adjustable damping vibration reduction device is installed on the sling is tested with a testing instrument; and the damping ratio after the adjustable damping vibration reduction device is installed is analyzed using the environmental excitation time-history curves obtained twice, and the telescopic movement of the telescopic screw is adjusted within the adjustable range until the damping ratio is maximized, which is determined as the length of the telescopic screw.

[0018] On the basis of the above technical solution, the adjustable damping vibration reduction device further comprises a screw driver and a screw nut, wherein the screw driver is arranged inside the triangular support frame, the screw nut is arranged at the top of the triangular support frame, and the telescopic screw passes through the top of the triangular support frame and the screw nut;

[0019] The adjusting the telescopic movement of the telescopic screw rod comprises:

[0020] The screw driver controls the telescopic screw to extend or shorten.

[0021] Based on the above technical solution, the length of the vibration damping box is smaller than the spacing between the two slings, and a cross bar and two matching meshing bevel gears are arranged inside the box, one meshing bevel gear is arranged at the top of the telescopic screw, and the other meshing bevel gear is arranged on the cross bar; when the telescopic screw rotates, the cross bar is driven to rotate by the two meshing bevel gears, thereby driving the crawling device to crawl along the sling.

[0022] On the basis of the above technical solution, the crawling device includes a connecting rod, two flat gears and two arc pulleys. The first flat gear is close to the side end face of the shock-absorbing box body and is coaxially arranged therewith; the second flat gear is meshed with the first flat gear; the sliding grooves of the two arc pulleys are respectively clamped on both sides of the sling, and one of the arc pulleys is coaxially close to the side end face of the second flat gear; the connecting rod is connected to the rotating shaft of the connecting rod; when the cross bar rotates, the first flat gear rotates, and the two arc pulleys clamp the sling to rotate and crawl.

[0023] The beneficial effects of the technical solution provided by this application include:

[0024] 1. The adjustable damping vibration reduction device of the present application is cleverly designed. It uses a telescopic screw to provide thrust and tension to the vibration reduction box, providing a basis for the vibration reduction box to move along the length direction of the sling. At the same time, two meshing bevel gears are designed to drive the cross bar to rotate. The rotation of the cross bar further provides crawling force for the crawling device. The crawling device has a delicate spatial design. It is staggered through two flat gears, and two arc pulleys are used to clamp the sling. The cross bar rotates the two arc pulleys to clamp the sling and crawls up and down along the direction of the sling, effectively adjusting the position of the connection point between the vibration reduction box and the sling, thereby improving the vibration reduction effect. The damper is no longer installed at the proximal end of the sling, and its position on the sling is adjustable, and the vibration reduction box is designed for multi-order modal vibrations.

[0025] The transmission conversion of the present application is ingenious, and the crawling device makes the up and down movement of the adjustable damping vibration reduction device stable and reliable; the two sides of the vibration reduction box body are movably connected to the sling, the telescopic screw rod only provides pushing and pulling force, and the vibration reduction box body and the sling are constantly sliding and rubbing; the crawling device of the present application has stable movement and little wear on the structure, and is easy to adjust flexibly.

[0026] 2. The installation method of the adjustable damping vibration reduction device of the present application obtains the damping ratio by analyzing the environmental excitation time-history curves before and after the adjustable damping vibration reduction device is installed on the sling. The damping ratio can be used to guide the adjustment of the telescopic screw rod, and the vibration reduction box is adjusted to the position with the largest damping ratio, that is, the position where the amplitude of the sling is the largest, which is also the optimal vibration reduction position, and can achieve the best vibration reduction effect. The damping ratio ensures the overall vibration reduction effect. Furthermore, individually, multiple narrow-band natural frequency vibration absorbers are combined to form a wide-band vibration range, covering the wide-band vibration of the sling, and solving the problem of multi-order vibration of the sling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the installation of the adjustable damping vibration reduction device provided in an embodiment of the present application on a sling;

[0029] Figure 2 for Figure 1 An enlarged schematic diagram of the damper, telescopic screw and triangular support frame;

[0030] Figure 3 for Figure 2 A top view of

[0031] Figure 4 for Figure 2 Left view of;

[0032] Figure 5 for Figure 4 An enlarged schematic diagram of the box, damper, spur gear and curved pulley in FIG.

[0033] Figure numerals: 1, triangular support frame; 2, screw nut; 3, telescopic screw; 4, arc pulley; 5, meshing bevel gear; 6, flat gear; 7, damper; 8, cross bar; 9, vibration reduction box; 10, sling; 11, anchor head; 12, connecting rod; 13, screw driver. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the present application discloses an embodiment of an adjustable damping vibration reduction device for a long sling, comprising a triangular support frame 1 arranged at the proximal end of the sling. The adjustable damping vibration reduction device also includes a vibration reduction box body 9 and a telescopic screw 3, and the vibration reduction box body 9 is transversely arranged between two slings 10. Both side end surfaces of the vibration reduction box body 9 are provided with crawling devices for clamping the slings 10. The vibration reduction box body 9 is provided with vibration dampers of more than two frequency ranges. The telescopic screw 3 is used to provide push-pull force for the vibration reduction box body 9, and its bottom end is fixed to the triangular support frame 1, and its top end is fixed to the vibration reduction box body 9.

[0036] The adjustable damping vibration reduction device of the present application has a vibration reduction box body 9 which is provided with vibration reducers with more than two frequency ranges, and can achieve wide-band coverage for the vibration of the sling, thus solving the technical problem that the frequency of the vibration prevention of the existing fixed damping vibration reduction device is a narrow-band one; at the same time, the vibration reduction box body 9 of the present application is no longer installed at the proximal end of the sling, but is installed above the proximal end, and at the same time, the vibration reduction box body 9 can move relative to the sling 10, can adapt to slings of different lengths, and can be adjusted to the optimal position as needed to achieve the best vibration reduction effect.

[0037] In one embodiment, the adjustable damping vibration reduction device further includes a screw driver 13 and a screw nut 2, wherein the screw driver 13 is disposed inside the triangular support frame 1, the screw nut 2 is disposed at the top of the triangular support frame 1, the telescopic screw 3 passes through the top of the triangular support frame 1 and the screw nut 2, and the screw driver 13 is used to control the extension or shortening of the telescopic screw 3. The screw driver 13, the screw nut 2 and the triangular support frame 1 of the present application are combined to form a stable telescopic structure, which can drive the vibration reduction box body 9 to move along the sling 10 and adapt to slings 10 of different lengths.

[0038] Furthermore, the length of the vibration-damping box 9 is less than the distance between the two slings 10, and a cross bar 8 and two matching meshing bevel gears 5 are arranged inside the vibration-damping box 9. The cross bar 8 is located in the middle of the vibration-damping box 9 and can rotate. One meshing bevel gear 5 is arranged at the top of the telescopic screw 3, and the meshing bevel gear 5 is coaxial with the axis of the telescopic screw 3. The other meshing bevel gear 5 is provided with a cross bar 8, and its axis is coaxial with the cross bar 8. When the telescopic screw 3 rotates, the telescopic screw 3 extends or shortens while driving the cross bar 8 to rotate through the two meshing bevel gears 5, thereby driving the crawling device to crawl along the sling 10.

[0039] Such as 4 and Figure 5 As shown, further, the crawling device includes a connecting rod 12, two flat gears 6 and two arc pulleys 4, the first flat gear 6 is close to the side end face of the vibration damping box body 9 and is coaxially arranged therewith, that is, the first flat gear 6 is coaxial with the cross bar 8. The second flat gear 6 is meshed with the first flat gear 6, and in terms of spatial position, the second flat gear 6 is located on the inner side or outer side of the first flat gear 6. The sliding grooves of the two arc pulleys 4 are respectively clamped on both sides of the sling 10, and one of the arc pulleys 4 is coaxially close to the side end face of the second flat gear 6. The two arc pulleys 4 each have their own rotation axis. The connecting rod 12 is vertically connected to the rotation axes of the two arc pulleys 4. One arc pulley 4 moves synchronously with the second flat gear 6, and the other arc pulley 4 rotates freely around the rotation axis. When the cross bar 8 rotates, the first flat gear 6 rotates, driving the second flat gear 6 to rotate, and the second flat gear 6 drives an arc pulley 4 to rotate, and then through the connecting rod 12, the two arc pulleys 4 clamp the sling and crawl up and down along the sling.

[0040] In the adjustable damping vibration reduction device of the present application, the vibration reduction box body 9 is relatively fixed to the top of the telescopic screw rod 3, and the telescopic screw rod 3 can rotate through the bottom wall of the vibration reduction box body 9. Both ends of the cross bar 8 pass through the vibration reduction box body 9, but its length is less than the distance between the two slings 10.

[0041] The adjustable damping vibration reduction device of the present application is cleverly designed. The telescopic screw 3 is used to provide thrust and pull to the vibration reduction box 9, providing a basis for the vibration reduction box 9 to move along the length direction of the sling 10. At the same time, two meshing bevel gears 5 are designed to drive the cross bar 8 to rotate. The rotation of the cross bar 8 further provides crawling force for the crawling device. The crawling device has an exquisite spatial design. Through the two flat gears 6, the two arc pulleys 4 are used to clamp the sling 10. The cross bar 8 rotates the two arc pulleys 4 to clamp the sling 10 and crawls up and down along the direction of the sling 10. The transmission conversion of the present application is clever, and the crawling device makes the adjustable damping vibration reduction device move up and down stably and reliably. Compared with the two sides of the vibration reduction box 9 being movably connected to the sling, the telescopic screw 3 only provides push and pull force, and the vibration reduction box 9 and the sling are constantly sliding and rubbing. The crawling device of the present application has stable movement, small wear on the structure, and is easy to adjust flexibly.

[0042] In one embodiment, the shock absorber includes a liquid mass shock absorber, a spring mass shock absorber, a pulley mass shock absorber and / or an inertial shock absorber. In the actual matching process, it can be flexibly matched and two or more types can be used. The vibration frequency ranges of the above different types of shock absorbers are different, and the vibrators with more than two frequency ranges can achieve a wide-band vibration reduction effect.

[0043] In one embodiment, the triangular support frame 1 includes a horizontal frame and two diagonal supports. Two ends of the horizontal frame clamp two slings respectively. The two diagonal supports are arranged diagonally to form a triangular structure.

[0044] The present application also discloses an installation method based on the above-mentioned adjustable damping vibration reduction device, comprising the following steps:

[0045] The environmental excitation time history curve of the sling before the adjustable damping vibration reduction device is installed is tested with a testing instrument to obtain the vibration frequency of the sling 10. Specifically, the wide-band vibration range of the sling 10 is obtained after a long period of measurement.

[0046] The bottom end of the telescopic screw rod 3 is fixed to the triangular support frame 1, and the vibration reduction box body 9 is installed on the top of the telescopic screw rod 3. Crawling devices are installed on both side end surfaces of the vibration reduction box body 9, and the crawling devices are clamped on the sling 10. Vibration absorbers with more than two frequency ranges are installed on the vibration reduction box body 9, and the natural frequencies of all vibration absorbers are within the vibration frequency range of the sling. A wide-band vibration range is formed by combining multiple narrow-band natural frequency vibration absorbers to cover the wide-band vibration of the sling.

[0047] The environmental excitation time history curve after the adjustable damping vibration reduction device is installed on the sling is tested with a testing instrument; and the damping ratio after the adjustable damping vibration reduction device is installed is analyzed using the environmental excitation time history curves obtained twice, and the telescopic movement of the telescopic screw rod 3 is adjusted within the adjustable range until the damping ratio is maximized, which is determined as the length of the telescopic screw rod 3.

[0048] The installation method of the adjustable damping vibration reduction device of the present application obtains the damping ratio by analyzing the environmental excitation time-history curve before and after the adjustable damping vibration reduction device is installed on the sling 10, until the adjustable damping vibration reduction device adjusts the telescopic screw rod 3 and adjusts the vibration reduction box body 9 to the optimal vibration reduction position, which can achieve the best vibration reduction effect; the damping ratio ensures the overall vibration reduction effect; further, individually, multiple narrow-band natural frequency vibration absorbers are combined to form a wide-band vibration range, covering the wide-band vibration of the sling, and solving the problem of multi-order vibration of the sling.

[0049] In one embodiment, the adjustable damping vibration reduction device further includes a screw driver 13 and a screw nut 2, wherein the screw driver 13 is disposed inside the triangular support frame 1, the screw nut 2 is disposed at the top of the triangular support frame 1, the telescopic screw 3 passes through the top of the triangular support frame 1 and the screw nut 2, and the screw driver 13 is used to control the extension or shortening of the telescopic screw 3. The screw driver 13, the screw nut 2 and the triangular support frame 1 of the present application are combined to form a stable telescopic structure, which can drive the vibration reduction box body 9 to move along the sling 10 and adapt to slings 10 of different lengths.

[0050] Wherein, adjusting the telescopic movement of the telescopic screw rod 3 includes:

[0051] The screw driver 13 controls the telescopic screw 3 to extend or shorten.

[0052] Furthermore, the length of the vibration-damping box 9 is less than the distance between the two slings 10, and a cross bar 8 and two matching meshing bevel gears 5 are arranged inside the vibration-damping box 9. The cross bar 8 is located in the middle of the vibration-damping box 9 and can rotate. One meshing bevel gear 5 is arranged at the top of the telescopic screw 3, and the meshing bevel gear 5 is coaxial with the axis of the telescopic screw 3. The other meshing bevel gear 5 is provided with a cross bar 8, and its axis is coaxial with the cross bar 8. When the telescopic screw 3 rotates, the telescopic screw 3 extends or shortens while driving the cross bar 8 to rotate through the two meshing bevel gears 5, thereby driving the crawling device to crawl along the sling 10.

[0053] Furthermore, the crawling device includes a connecting rod 12, two flat gears 6 and two arc pulleys 4. The first flat gear 6 is close to the side end face of the vibration damping box body 9 and is coaxially arranged therewith, that is, the first flat gear 6 is coaxial with the cross bar 8. The second flat gear 6 is meshed with the first flat gear 6. In terms of spatial position, the second flat gear 6 is located on the inner side or the outer side of the first flat gear 6. The sliding grooves of the two arc pulleys 4 are respectively clamped on both sides of the sling 10, and one of the arc pulleys 4 is coaxially close to the side end face of the second flat gear 6. The two arc pulleys 4 each have their own rotation axis. The connecting rod 12 is vertically connected to the rotation axes of the two arc pulleys 4. One arc pulley 4 moves synchronously with the second flat gear 6, and the other arc pulley 4 rotates freely around the rotation axis. When the cross bar 8 rotates, the first flat gear 6 rotates, driving the second flat gear 6 to rotate, and the second flat gear 6 drives an arc pulley 4 to rotate, and then through the connecting rod 12, the two arc pulleys 4 clamp the sling and crawl up and down along the sling.

[0054] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0055] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0056] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for installing an adjustable damping vibration reduction device for a long sling, characterized in that: The invention comprises an adjustable damping vibration reduction device for a long sling, comprising a triangular support frame (1) arranged at the proximal end of the sling, and the adjustable damping vibration reduction device further comprises: A vibration-damping box body is transversely arranged between two slings (10); the vibration-damping box body is provided with vibration dampers of two or more frequency ranges; and crawling devices for clamping the slings (10) are arranged on both side end surfaces of the vibration-damping box body; A telescopic screw rod (3) for providing a push-pull force for the vibration-damping box body, the bottom end of which is fixed to the triangular support frame (1) and the top end of which is fixed to the vibration-damping box body; The adjustable damping vibration reduction device further comprises a screw driver (13) and a screw nut (2), wherein the screw driver (13) is arranged inside the triangular support frame (1), the screw nut (2) is arranged at the top of the triangular support frame (1), the telescopic screw (3) passes through the top of the triangular support frame (1) and the screw nut (2), and the screw driver (13) is used to control the extension or shortening of the telescopic screw (3); The triangular support frame (1) comprises a horizontal frame and two diagonal braces, two ends of the horizontal frame are respectively clamped with two slings, and the two diagonal braces are arranged diagonally to form a triangular structure; The installation method comprises the following steps: Using a testing instrument to test the environmental excitation time history curve of the sling before the adjustable damping vibration reduction device is installed, and obtain the vibration frequency of the sling (10); The bottom end of the telescopic screw rod (3) is fixed to the triangular support frame (1), and the vibration reduction box body is installed on the top end of the telescopic screw rod (3); crawling devices are installed on both side end surfaces of the vibration reduction box body; vibration dampers with two or more frequency ranges are installed on the vibration reduction box body, and the natural vibration frequencies of all vibration dampers are within the vibration frequency range of the sling; The test instrument is used to test the environmental excitation time history curve after the adjustable damping vibration reduction device is installed on the sling; the environmental excitation time history curves obtained twice are used to analyze the damping ratio after the adjustable damping vibration reduction device is installed, and the telescopic movement of the telescopic screw rod (3) is adjusted within the adjustable range until the damping ratio is maximized, which is determined as the length of the telescopic screw rod (3).

2. The method for installing an adjustable damping vibration reduction device for a long sling according to claim 1, characterized in that: The length of the vibration-damping box body is less than the spacing between the two slings, and a cross bar (8) and two matching meshing bevel gears (5) are arranged therein, one meshing bevel gear (5) is arranged at the top of the telescopic screw (3), and the other meshing bevel gear (5) is arranged on the cross bar (8), and its axis is coaxial with the cross bar (8); when the telescopic screw (3) rotates, the cross bar (8) is driven to rotate through the two meshing bevel gears (5), thereby driving the crawling device to crawl along the sling.

3. The method for installing an adjustable damping vibration reduction device for a long sling according to claim 2, characterized in that: The crawling device comprises a connecting rod (12), two flat gears (6) and two arc pulleys (4), wherein the first flat gear (6) is in close contact with the side end surface of the vibration damping box body and is coaxially arranged therewith; the second flat gear (6) is meshed with the first flat gear (6); the slide grooves of the two arc pulleys (4) are respectively clamped on both sides of the sling (10), and one of the arc pulleys (4) is coaxially in close contact with the side end surface of the second flat gear (6); the connecting rod (12) is vertically connected to the rotation axes of the two arc pulleys (4); when the cross bar (8) rotates, the first flat gear (6) rotates, and the two arc pulleys (4) clamp the sling to rotate and crawl.

4. The method for installing an adjustable damping vibration reduction device for a long sling according to claim 1, characterized in that: The damper includes a liquid mass damper, a spring mass damper, a pulley mass damper and / or an inertial mass damper.

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