Lifting steel wire rope anti-drooping device of flat head type tower crane

Abstract

The invention discloses an anti-sagging device for a lifting steel wire rope of a flat-end type tower crane, and relates to the technical field of sagging prevention for the lifting steel wire rope of the flat-end type tower crane. The anti-drooping device for the hoisting steel wire rope of the flat head type tower crane comprises a rectangular frame with an upper opening and a lower opening, and a follow-up driving mechanism which is mounted between a pulley frame and a suspension arm so as to automatically adjust the position of the rectangular frame according to the moving position of the pulley frame is arranged in the rectangular frame; the position of the bearing mechanism is dynamically adjusted through the follow-up driving mechanism, so that the bearing mechanism is accurately borne in the middle of a lifting steel wire rope, and the bearing mechanism synchronously and adaptively moves along with the length change of the lifting steel wire rope section between the lifting arm and the pulley frame; the follow-up driving mechanisms are connected in series, so that the change of the lifting steel wire rope caused by the lengthening of the suspension arm is effectively dealt with, the anti-droop requirement of a longer lifting steel wire rope can be met, and the number of required anti-droop devices is reduced through the extension of the inhaul cable.

Description

Technical Field

[0001] The invention relates to the technical field of anti-drooping of a hoisting steel wire rope of a topless tower crane, in particular to an anti-drooping device for a hoisting steel wire rope of a topless tower crane. Background Art

[0002] Flat-top tower cranes are usually referred to as flat-top tower cranes. They are a type of lifting equipment widely used in construction, especially in high-rise buildings, bridges, ports and other fields. They are a type of tower crane. The structure removes the tower top and tie rod parts of the traditional tower crane and adopts a simplified flat-top structure. In the lifting system of the tower crane, the wire rope is an important load-bearing component connecting the crane, the hook and the load. The wire rope transmits power and load through the lifting mechanism to complete the lifting and lowering of materials. Although the lifting wire rope is usually kept taut when lifting materials, it is very important when the tower crane is unloaded or stopped. Or when not in operation, the boom will sag due to its usually long span and the deadweight and gravity of the wire rope. The drooping wire rope becomes loose when there is no load or low load. This condition will cause the wire rope to rub against other parts of the tower crane (such as the tower boom) when it is hanging. Moreover, in a windy environment, the hanging wire rope is easily affected by the wind and swings greatly, which may cause the wire rope to wear or fall off, thus affecting the normal use and safety of the crane. Therefore, an anti-droop device is needed to effectively reduce this risk and ensure that the wire rope is in a controlled state.

[0003] The existing anti-droop device is usually fixedly installed on the boom. Once the installation position is determined, it cannot be adjusted. Therefore, the anti-droop device can only work at a specific boom position. When the boom is lengthened according to construction requirements, the existing anti-droop device cannot automatically adapt to the new boom length, resulting in some wire rope segments that could have been supported being unable to obtain effective anti-droop support on the lengthened boom. This has certain limitations, and the effect of the anti-droop device will be greatly reduced. Some wire rope segments may still droop. In addition, since the number of fixed supporting points of existing anti-sagging devices is limited, in order to ensure the anti-sagging effect of the entire wire rope, a large number of anti-sagging devices often need to be installed, resulting in increased maintenance and adjustment workload during the construction process. Summary of the invention

[0004] The present invention provides a device for preventing the lifting wire rope of a flat-top tower crane, which solves the problem that the existing anti-sagging devices are usually fixedly installed on the boom and cannot be adjusted once the position is determined, so they can only function at a specific boom position. When the boom is lengthened, the anti-sagging device cannot automatically adapt to the new length, resulting in some wire rope sections being unable to be effectively supported, and the anti-sagging effect is greatly reduced. In addition, due to the limited number of fixed supporting points, in order to ensure the anti-sagging effect of the wire rope, it is often necessary to install multiple anti-sagging devices, which increases the maintenance and adjustment workload during the construction process and has certain limited technical problems.

[0005] The present invention provides a device for preventing the lifting wire rope from sagging for a flat-top tower crane, comprising a rectangular frame with upper and lower openings, wherein a follow-up driving mechanism for being installed between a pulley frame and a boom so as to automatically adjust the position of the rectangular frame according to the moving position of the pulley frame is arranged in the rectangular frame, a supporting mechanism for holding the lifting wire rope to prevent it from sagging is arranged at the lower part of the rectangular frame, the follow-up driving mechanism is used to indirectly adjust the position of the supporting mechanism to ensure that the supporting mechanism is adaptively moved to the best anti-sagging position for the lifting wire rope, and the follow-up driving mechanism includes a through-hole A rotating shaft rotatably connected to the front and rear wall panels of the rectangular frame, a reset coil spring fixedly connected between the outer wall of the rotating shaft and the rear end surface of the rectangular frame, a drum fixedly connected to the outside of the rotating shaft and located in the rectangular frame, and two cables symmetrically distributed and wound and fixedly connected to the outside of the drum, the two cables are wound in opposite directions, and a connecting hook is provided at one end of the cable away from the drum. The rectangular frame is provided with an auxiliary support mechanism for increasing the anti-sagging range of the lifting wire rope from the left and right sides of the rectangular frame respectively, and the upper part of the rectangular frame is provided with a connecting part for quick installation on the boom.

[0006] In one possible implementation, the auxiliary support mechanism includes a gear ring fixedly connected to the outside of the rotating shaft, two transverse shifting assemblies symmetrically distributed centrally for cooperating with the gear ring, folding plates respectively arranged on the laterally opposite sides of the transverse shifting assemblies, and an auxiliary support roller rotatably connected to the rear end surface of the folding plate through a rotating rod.

[0007] In one possible implementation, the transverse movement assembly located at the upper part includes a bearing seat fixedly connected to the front end face of the rectangular frame and located directly above the gear ring, and a sliding rod slidingly connected to the bearing seat, column grooves are provided at both ends of the sliding rod, sliding columns are slidably connected in the column grooves, and the ends of the two sliding columns away from each other are commonly fixedly connected to a U-shaped plate, a limit spring slidingly sleeved on the outside of the sliding column is fixedly connected between the end of the sliding rod and the vertical section of the U-shaped plate, a rack meshing with the gear ring is fixedly connected to the lower end face of the U-shaped plate, and two folding plates are respectively fixedly connected to the laterally opposite sides of the U-shaped plates in the two transverse movement assemblies.

[0008] In a possible implementation, the connecting portion includes two support plates that are symmetrically fixedly connected to the upper end surface of the rectangular frame front and back, and a sliding bar that is slidably connected to the support plates. The two sliding bars are fixedly connected to a wheel frame at one end away from each other. The wheel frame is symmetrically connected to a work-shaped guide wheel for rotation left and right, and a component for moving toward each other is commonly provided between the two sliding bars.

[0009] In a possible implementation, the oppositely moving assembly includes a bidirectional screw rod that passes through and rotates together on two support plates, the lower end surface of the sliding bar is fixedly connected to a push plate threadedly connected to the bidirectional screw rod, and the front part of the outer wall of the bidirectional screw rod is fixedly connected to a shift plate.

[0010] In a possible implementation, the surface of the auxiliary roller is gradually recessed from both ends to the middle portion toward the side close to its own axis.

[0011] In one possible implementation, the supporting mechanism includes a C-shaped seat fixedly connected to the lower end surface of the rectangular frame by a connecting rod, and the upper and lower opposite side cavity walls of the C-shaped seat are provided with slots, a sliding block is slidably connected in the slot, and a top spring is fixedly connected between the sliding block and the slot, the rear side of the sliding block is an arc-shaped surface, and the front end surfaces of the two sliding blocks are inclined surfaces that gradually approach the midline side between the two from front to back.

[0012] In a possible implementation, the left and right wall panels of the rectangular frame are both provided with half-waist-shaped notch grooves for corresponding cables to enter, and the two half-waist-shaped notch grooves are arranged symmetrically with respect to the center.

[0013] In a possible implementation, two limit stop rings for limiting the lateral travel distance of the slide bar are fixedly connected symmetrically to the outer wall of the slide bar.

[0014] It can be seen from the above technical solutions that the present invention has the following advantages: In the present invention, the position of the supporting mechanism is dynamically adjusted by the cooperation of two cables and drums that are centrally symmetrically wound in the follow-up driving mechanism, so that the supporting mechanism can accurately support the middle part of the lifting wire rope, and at the same time ensure that the supporting mechanism always moves synchronously and adaptively with the change in the length of the wire rope segment between the pulley frame and the farthest end of the boom, so that it can flexibly cope with the synchronous lengthening and changes of the lifting wire rope caused by the boom, thereby improving the stability and anti-sagging effect of the wire rope.

[0015] In the present invention, multiple follow-up drive mechanisms are connected in series to prevent the lifting wire rope from drooping for a longer length, thereby increasing the scope of application. The release and elongation of the cable in the follow-up drive mechanism can be used to reduce the number of required anti-drooping devices. Compared with traditional anti-drooping devices, the entire lifting wire rope can be covered with fewer devices, effectively reducing the dense arrangement of devices on the boom, and reducing maintenance costs and adjustment workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of a hoisting wire rope anti-sagging device for a flat-top tower crane provided by the present invention.

[0018] Figure 2 The present invention provides Figure 1 Schematic diagram of the enlarged structure of part A in the figure.

[0019] Figure 3 This is a schematic diagram of the rear view of the overall structure provided by the present invention.

[0020] Figure 4 This is a schematic diagram of the connection structure between the drum and the cable provided by the present invention.

[0021] Figure 5 This is a schematic diagram of the connecting portion structure provided by the present invention.

[0022] Figure 6 This is a schematic diagram of the sectional installation structure of the supporting mechanism provided by the present invention from the right side view.

[0023] The above drawings include the following reference numerals: 1. Rectangular frame; 2. Follow-up drive mechanism; 21. Rotating shaft; 22. Reset coil spring; 23. Reel; 24. Cable; 25. Connecting hook; 3. Supporting mechanism; 31. C-shaped seat; 32. Notch; 33. Sliding block; 4. Auxiliary supporting mechanism; 41. Gear ring; 42. Transverse shift assembly; 421. Bearing seat; 422. Sliding rod; 423. Sliding column; 424. U-shaped plate; 425. Limit spring; 426. Rack; 43. Folding plate; 44. Auxiliary roller; 5. Connecting part; 51. Support plate; 52. Sliding bar; 53. Wheel frame; 54. I-type guide wheel; 55. Opposite moving assembly; 551. Bidirectional screw; 552. Push plate; 6. Semi-waisted notch groove; 7. Limit retaining ring. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] See also Figure 1 The present invention provides a technical solution: a device for preventing the lifting wire rope from sagging for a flat-top tower crane, comprising a rectangular frame 1 with upper and lower openings, a follow-up driving mechanism 2 for being installed between a pulley frame and a boom so as to automatically adjust the position of the rectangular frame 1 according to the moving position of the pulley frame, a supporting mechanism 3 for holding the lifting wire rope to prevent it from sagging is arranged at the lower part of the rectangular frame 1, the follow-up driving mechanism 2 is used to indirectly adjust the position of the supporting mechanism 3 to ensure that the supporting mechanism 3 is adaptively moved to the best anti-sagging position for the lifting wire rope, an auxiliary supporting mechanism 4 for increasing the anti-sagging range of the lifting wire rope from the left and right sides of the rectangular frame 1 is arranged on the rectangular frame 1, and a connecting portion 5 for quickly installing it on the boom is arranged at the upper part of the rectangular frame 1.

[0026] See also Figure 1 and Figure 5 In this embodiment, the connecting part 5 includes two support plates 51 which are symmetrically fixedly connected to the upper end surface of the rectangular frame 1 front and back, and a sliding bar 52 which is slidably connected to the support plate 51. The ends of the two sliding bars 52 which are away from each other are fixedly connected to a wheel frame 53. The wheel frame 53 is symmetrically rotatably connected to the industrial guide wheel 54. A mutually movable component 55 is commonly arranged between the two sliding bars 52. The mutually movable component 55 includes a bidirectional screw 551 which is rotatably connected to the two support plates 51 through the two bars. A push plate 552 which is threadedly connected to the bidirectional screw 551 is fixedly connected to the lower end surface of the sliding bar 52, and a shift plate is fixedly connected to the front of the outer wall of the bidirectional screw 551.

[0027] First, place the rectangular frame 1 between the two guide rails at the bottom of the crane boom, and then manually rotate the dial plate or use external electric equipment to drive the bidirectional screw 551 to rotate. The bidirectional screw 551 then drives the two push plates 552 to move away from each other, and the push plates 552 then drive the sliding bar 52 to move. The sliding bar 52 then drives the industrial guide wheel 54 to move through the wheel frame 53 until the industrial guide wheel 54 hits the guide rail, and the placement and installation of the rectangular frame 1 can be completed by having the front and rear corresponding industrial guide wheels 54 jointly stuck on the outside of the guide rail.

[0028] See also Figure 1 and Figure 6In this embodiment, the supporting mechanism 3 includes a C-shaped seat 31 fixedly connected to the lower end surface of the rectangular frame 1 through a connecting rod, and the upper and lower opposite side walls of the C-shaped seat 31 are provided with slots 32, and a sliding block 33 is slidably connected in the slot 32. A top spring is fixedly connected between the sliding block 33 and the slot 32. The rear side of the sliding block 33 is an arc surface, and the front end surfaces of the two sliding blocks 33 are inclined surfaces that gradually approach the midline side between the two from front to back.

[0029] See also Figure 1 , Figure 3 and Figure 4 The follow-up driving mechanism 2 includes a rotating shaft 21 that is rotatably connected to the front and rear wall panels of the rectangular frame 1, a return coil spring 22 that is fixedly connected between the outer wall of the rotating shaft 21 and the rear end surface of the rectangular frame 1, a drum 23 that is fixedly connected to the outside of the rotating shaft 21 and located in the rectangular frame 1, and two cables 24 that are symmetrically distributed and wound and fixedly connected to the outside of the drum 23. The winding directions of the two cables 24 are opposite, and a connecting hook 25 is provided at one end of the cable 24 away from the drum 23. Semi-waist-shaped notch grooves 6 for corresponding cables 24 to enter are opened on the left and right wall panels of the rectangular frame 1, and the two semi-waist-shaped notch grooves 6 are arranged symmetrically.

[0030] The lifting wire rope is pressed against the inclined surfaces of the two sliding blocks 33 and pressed against them. The lifting wire rope pushes the two sliding blocks 33 away from each other through the inclined surfaces in front of the sliding blocks 33, so that the sliding blocks 33 gradually retract into the grooves 32. When the lifting wire rope completely passes over the sliding blocks 33 and enters the area between the sliding blocks 33 and the C-shaped seat 31, the top spring pushes the sliding blocks 33 to reset and move, so that the two sliding blocks 33 are docked together. At this time, the sliding blocks 33 and the C-shaped seat 31 are jointly mounted on the outside of the lifting wire rope.

[0031] Then hook one of the connecting hooks 25 on the farthest end of the boom, and then connect the other connecting hook 25 to the pulley frame. When the pulley frame moves, it will drive the cable 24 connected to it to move synchronously, and the cable 24 will then drive the drum 23 to rotate, and the drum 23 will rotate to release another cable 24. When the pulley frame moves toward the far end of the boom, the cable 24 connected to the pulley frame will relax, and then the reset coil spring 22 will reset and drive the rotating shaft 21 to reverse, and the rotating shaft 21 will then drive the drum 23 to rotate, and the drum 23 can wind up the cable 24 again.

[0032] By winding up and releasing the two cables 24 together, the rectangular frame 1 can move synchronously with the movement of the pulley frame, and the rectangular frame 1 then drives the C-shaped seat 31 to move, ensuring that the C-shaped seat 31 can accurately support the middle part of the lifting wire rope to prevent the wire rope from sagging, and the supporting position of the C-shaped seat 31 is the optimal point; even with the change in the length of the boom, the C-shaped seat 31 can automatically adjust its position according to the change in the length of the lifting wire rope segment between the pulley frame and the farthest end of the boom, and always maintain the best supporting position for the wire rope, thereby ensuring that the anti-sagging effect is still effective even when the boom is lengthened or under different working conditions, and the cable 24 will enter the semi-waist-shaped notch when it is pulled straight, avoiding the situation where the cable 24 is stretched until it directly contacts the rectangular frame 1 and causes scratches.

[0033] In addition, when the boom is long and the length of the lifting wire rope segment between the far end of the boom and the pulley frame is greater than the length of the two cables 24 on the drum 23 combined, the lifting wire rope anti-droop devices of multiple flat-top tower cranes can be connected in series using a connecting hook 25, and then the lifting wire rope anti-droop devices of the multiple flat-top tower cranes that are connected in series are connected to the far end of the boom and the pulley frame. Assuming that n number of lifting wire rope anti-droop devices of flat-top tower cranes are used, the lifting wire rope anti-droop devices of the flat-top tower cranes will divide the lifting wire rope into n+1 segments, and the lifting wire rope anti-droop device of each flat-top tower crane is located at the middle position of the equally divided lifting wire rope segments to ensure that the supporting position is the best point; at the same time, since the cables 24 in the lifting wire rope anti-droop device of each flat-top tower crane can be released and extended, the number of anti-droop devices that need to be installed on the boom is greatly reduced compared with the existing anti-droop devices.

[0034] See also Figure 1 and Figure 3 In this embodiment, the auxiliary support mechanism 4 includes a gear ring 41 fixedly connected to the outside of the rotating shaft 21, two transverse shifting components 42 symmetrically distributed with the center for cooperating with the gear ring 41, folding plates 43 respectively arranged on the laterally opposite sides of the transverse shifting components 42, and an auxiliary support roller 44 rotatably connected to the rear end surface of the folding plate 43 through a rotating rod, and the surface of the auxiliary support roller 44 is gradually concave from its two ends to the middle toward the side close to its own axis.

[0035] See also Figure 1 and Figure 2The lateral movement component 42 located at the upper part includes a bearing seat 421 fixedly connected to the front end face of the rectangular frame 1 and located directly above the gear ring 41, and a sliding rod 422 slidingly connected in the bearing seat 421. Column grooves are provided at both ends of the sliding rod 422, and sliding columns 423 are slidably connected in the column grooves. The ends of the two sliding columns 423 away from each other are commonly fixedly connected to a U-shaped plate 424. A limit spring 425 slidingly sleeved on the outside of the sliding column 423 is fixedly connected between the end of the sliding rod 422 and the vertical section of the U-shaped plate 424. A rack 426 meshing with the gear ring 41 is fixedly connected to the lower end face of the U-shaped plate 424. The two folding plates 43 are respectively fixedly connected to the laterally opposite sides of the U-shaped plates 424 in the two lateral movement components 42. Two limit rings 7 for limiting the lateral movement distance of the sliding rod 422 are symmetrically fixedly connected to the outer wall of the sliding rod 422.

[0036] The lifting wire rope is inserted into the C-shaped seat 31 and is also placed on the auxiliary roller 44. When the cable 24 is pulled and released to drive the drum 23 to rotate, the drum 23 drives the rotating shaft 21 to rotate, and the rotating shaft 21 then drives the gear ring 41 to rotate, and the gear ring 41 then drives the rack 426 to move, and the two racks 426 move in a direction away from each other, and the rack 426 drives the U-shaped plate 424 to move, and the U-shaped plate 424 then drives the slide bar 422 to move through the sliding column 423 and the limit spring 425, so that the slide bar 422 is in the bearing The carrier 421 slides laterally, and at the same time, the U-shaped plate 424 drives the auxiliary roller 44 to move synchronously through the folding plate 43 and the rotating rod. The two auxiliary rollers 44 move synchronously in the direction away from the rectangular frame 1. The auxiliary rollers 44 move sideways to further increase the supporting range of the lifting wire rope, and further improve the anti-sagging effect of the lifting wire rope. The arc surface of the auxiliary roller 44 gradually concave toward the middle can be used to better restrict the lifting wire rope on the auxiliary roller 44, thereby reducing the risk of sliding and deflecting the wire rope and maintaining its stability.

[0037] When the auxiliary roller 44 moves to the farthest distance away from the rectangular frame 1, the slide bar 422 drives the limit ring 7 to contact the bearing seat 421, so that the slide bar 422 is stuck, but at this time, the cable 24 has not been completely released, so the drum 23 will continue to rotate, and the drum 23 will continue to drive the rotating shaft 21 to rotate, and the rotating shaft 21 will then drive the gear ring 41 to continue to rotate normally. At this time, the gear ring 41 pushes the U-shaped plate 424 to move horizontally through the rack 426, and the U-shaped plate 424 drives the sliding column 423 to slide in the column groove, so that the limit spring 425 is in a pressed state, and the limit spring 425 is used to ensure that the first tooth of the rack 426 located on the side is always in contact with the gear ring 41.

[0038] When the rotating shaft 21 is caught and reversed and reset under the action of the reset reel 23, the rotating shaft 21 will drive the gear ring 41 to reverse, and the gear ring 41 will then drive the U-shaped plate 424 to move toward the direction close to the rectangular frame 1 through the rack 426, and the U-shaped plate 424 will drive the auxiliary roller 44 to move synchronously through the folding plate 43 and the rotating rod until the auxiliary roller 44 moves to the initial position, at which time another limit stop ring 7 abuts against the bearing seat 421, so that the slide bar 422 is stuck, and then the steps when the rising slide bar 422 is stuck can be repeated.

[0039] During operation, firstly, the rectangular frame 1 is slidably installed on the boom using the connecting portion 5, and then the two connecting hooks 25 in the follow-up driving mechanism 2 are respectively connected to the far end of the boom and the pulley frame, and at the same time, the lifting wire rope is passed through the supporting mechanism 3, and the follow-up driving mechanism 2 is operated according to the change in the length of the lifting wire rope segment between the pulley frame and the far end of the boom. The follow-up driving mechanism 2 adjusts the position of the supporting mechanism 3 in real time, so that the supporting mechanism 3 is located in the middle position of the lifting wire rope to be supported. At the same time, the auxiliary supporting mechanism 4 will also operate synchronously, and the two auxiliary supporting rollers 44 in the auxiliary supporting mechanism 4 distributed on the side of the rectangular frame 1 can further support the lifting wire rope, thereby avoiding the sagging of the lifting wire rope.

[0040] In addition, the lifting wire rope anti-sagging devices of multiple flat-top tower cranes can be connected together in series according to the length of the lifting wire rope segment located between the far end of the boom and the pulley frame to provide multi-point support. At the same time, compared with the existing anti-sagging methods, the number of anti-sagging devices that need to be installed on the boom is greatly reduced.

[0041] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] In addition, the terms "first", "second", "number one", "number two" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "number one", "number two" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preventing the lifting wire rope from sagging of a flat-top tower crane, comprising a rectangular frame (1) with upper and lower openings, characterized in that: The rectangular frame (1) is provided with a follow-up drive mechanism (2) for being installed between the pulley frame and the boom so as to automatically adjust the position of the rectangular frame (1) according to the moving position of the pulley frame; the lower part of the rectangular frame (1) is provided with a supporting mechanism (3) for supporting the lifting wire rope to prevent it from sagging; the follow-up drive mechanism (2) is used to indirectly adjust the position of the supporting mechanism (3) to ensure that the supporting mechanism (3) is adaptively moved to the best anti-sagging position for the lifting wire rope; The follow-up driving mechanism (2) comprises: A rotating shaft (21) rotatably connected to the front and rear wall plates of the rectangular frame (1), a return coil spring (22) fixedly connected between the outer wall of the rotating shaft (21) and the rear end surface of the rectangular frame (1), a reel (23) fixedly connected to the outside of the rotating shaft (21) and located in the rectangular frame (1), and two cables (24) symmetrically distributed and wound and fixedly connected to the outside of the reel (23), the two cables (24) being wound in opposite directions, and a connecting hook (25) being provided at one end of the cable (24) away from the reel (23); The rectangular frame (1) is provided with an auxiliary support mechanism (4) for increasing the anti-drooping range of the lifting wire rope from the left and right sides of the rectangular frame (1), and the upper part of the rectangular frame (1) is provided with a connecting part (5) for quick installation on the boom.

2. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 1, characterized in that: The auxiliary support mechanism (4) comprises a gear ring (41) fixedly connected to the outside of the rotating shaft (21), two transverse shifting assemblies (42) symmetrically distributed at the center for cooperating with the gear ring (41), folding plates (43) respectively arranged on the laterally opposite sides of the transverse shifting assemblies (42), and an auxiliary support roller (44) rotatably connected to the rear end surface of the folding plate (43) via a rotating rod.

3. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 2, characterized in that: The transverse movement assembly (42) located at the upper part comprises a bearing seat (421) fixedly connected to the front end surface of the rectangular frame (1) and located directly above the gear ring (41), and a sliding rod (422) slidably connected to the bearing seat (421), column grooves are provided at both ends of the sliding rod (422), sliding columns (423) are slidably connected in the column grooves, and the ends of the two sliding columns (423) that are away from each other are commonly fixedly connected to a U-shaped plate (424), a limit spring (425) slidably sleeved on the outside of the sliding column (423) is fixedly connected between the end of the sliding rod (422) and the vertical section of the U-shaped plate (424), a rack (426) meshing with the gear ring (41) is fixedly connected to the lower end surface of the U-shaped plate (424), and the two folding plates (43) are respectively fixedly connected to the laterally opposite sides of the U-shaped plates (424) in the two transverse movement assemblies (42).

4. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 1, characterized in that: The connecting portion (5) comprises two support plates (51) respectively symmetrically fixedly connected to the upper end surface of the rectangular frame (1) in a front-to-back manner and a sliding bar (52) penetrating and slidably connected to the support plates (51); the ends of the two sliding bars (52) that are away from each other are both fixedly connected to a wheel frame (53); the wheel frame (53) is symmetrically rotatably connected to a work-shaped guide wheel (54); and a moving assembly (55) is provided between the two sliding bars (52).

5. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 4, characterized in that: The oppositely moving assembly (55) comprises a bidirectional screw rod (551) penetrating and rotatably connected to two support plates (51); a push plate (552) threadedly connected to the bidirectional screw rod (551) is fixedly connected to the lower end surface of the sliding bar (52); and a shift plate is fixedly connected to the front of the outer wall of the bidirectional screw rod (551).

6. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 2, characterized in that: The surface of the auxiliary roller (44) is gradually concave from both ends to the middle part towards the side close to its own axis.

7. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 1, characterized in that: The supporting mechanism (3) comprises a C-shaped seat (31) fixedly connected to the lower end surface of the rectangular frame (1) through a connecting rod, and the upper and lower opposite side walls of the C-shaped seat (31) are both provided with slots (32), a sliding block (33) is slidably connected in the slot (32), a top spring is fixedly connected between the sliding block (33) and the slot (32), the rear side of the sliding block (33) is an arc surface, and the front end surfaces of the two sliding blocks (33) are inclined surfaces that gradually approach the midline side between the two sliding blocks from front to back.

8. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 1, characterized in that: The left and right wall plates of the rectangular frame (1) are both provided with half-waist-shaped notch grooves (6) for corresponding cables (24) to enter, and the two half-waist-shaped notch grooves (6) are arranged in a centrally symmetrical manner.

9. The device for preventing the hoisting wire rope from sagging of a flat-top tower crane according to claim 3, characterized in that: Two limit rings (7) for limiting the lateral travel distance of the slide rod (422) are fixedly connected symmetrically to the outer wall of the slide rod (422).

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