Anti-sagging device for hoisting wire rope of flat-top tower crane

Abstract

The application discloses a kind of flat head type tower crane hoisting steel wire rope anti-sag device, the present application relates to flat head type tower crane hoisting steel wire rope anti-sag technical field.The flat head type tower crane hoisting steel wire rope anti-sag device, including the upper and lower openings rectangular frame, rectangular frame is provided with for being installed between trolley frame and boom to facilitate the automatic adjustment rectangular frame position of follow-up type driving mechanism, rectangular frame upper portion is provided with the connecting portion for being quickly installed to boom, the present application is dynamically adjusted by follow-up type driving mechanism and is supported in the middle of hoisting steel wire rope with its accurate support mechanism position, and with the length change of hoisting steel wire rope section between boom and trolley frame Synchronous self-adapting movement, to effectively cope with the change of hoisting steel wire rope caused by boom lengthening, again by a plurality of follow-up type driving mechanism string connection, can adapt to the anti-sag demand of longer hoisting steel wire rope, and through cable elongation reduces the quantity of required anti-sag device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-sagging of hoisting steel wire rope of flat head tower crane, in particular to an anti-sagging device for hoisting steel wire rope of flat head tower crane. BACKGROUND

[0002] The flat head tower crane is usually referred to as flat head tower crane, which is a kind of hoisting equipment widely used in construction, especially in high-rise buildings, bridges, ports and other fields. It belongs to a kind of tower crane, and the tower top and pull rod part of the traditional tower crane are removed, and a simplified flat head structure is adopted. In the hoisting system of the tower crane, the steel wire rope is an important load-bearing component connecting the crane and the hook and the load. The steel wire rope transmits power and load through the hoisting mechanism to complete the lifting and lowering of materials. Although the hoisting steel wire rope is usually kept tight during lifting, it will sag due to the long span of the boom and the weight of the steel wire rope and gravity in the non-working state. The sagging steel wire rope becomes loose under no load or low load, which may cause friction between the steel wire rope and other parts of the tower crane, such as the tower arm. In addition, the sagging steel wire rope is easily affected by wind in windy environment, which may cause large swing and lead to wear or falling of the steel wire rope, thereby affecting the normal use and safety of the crane. Therefore, an anti-sagging device is needed to effectively reduce the risk and ensure the controlled state of the steel wire rope.

[0003] The existing anti-sagging device is usually fixedly installed on the boom, and once the installation position is determined, it cannot be adjusted. Therefore, the anti-sagging device can only play a role at a specific boom position. When the boom is lengthened according to the construction requirements, the existing anti-sagging device cannot automatically adapt to the new boom length, resulting in that part of the steel wire rope that can be supported cannot be effectively supported after the boom is lengthened, which has certain limitations. The effect of the anti-sagging device will be greatly reduced, and part of the steel wire rope may still sag.

[0004] In addition, due to the limited number of fixed supporting points of the existing anti-sagging device, in order to ensure the anti-sagging effect of the entire steel wire rope, a large number of anti-sagging devices need to be installed, which increases the maintenance and adjustment workload during construction. SUMMARY

[0005] The application provides a lifting steel wire rope anti-sag device of a flat head tower crane, and solves the technical problem that the existing anti-sag device is usually fixedly installed on a lifting arm, and once the position is determined, the anti-sag device cannot be adjusted, so the anti-sag device can only work at a specific position of the lifting arm, and when the lifting arm is lengthened, the anti-sag device cannot automatically adapt to the new length, so that part of the steel wire rope cannot be effectively supported, and the anti-sag effect is greatly reduced, and in addition, because the number of fixed supporting points is limited, in order to ensure the anti-sag effect of the steel wire rope, multiple anti-sag devices need to be installed, thereby increasing the maintenance and adjustment workload in the construction process, and the application has certain limitations.

[0006] The application provides a lifting steel wire rope anti-sag device of a flat head tower crane, and solves the technical problem that the existing anti-sag device is usually fixedly installed on a lifting arm, and once the position is determined, the anti-sag device cannot be adjusted, so the anti-sag device can only work at a specific position of the lifting arm, and when the lifting arm is lengthened, the anti-sag device cannot automatically adapt to the new length, so that part of the steel wire rope cannot be effectively supported, and the anti-sag effect is greatly reduced, and in addition, because the number of fixed supporting points is limited, in order to ensure the anti-sag effect of the steel wire rope, multiple anti-sag devices need to be installed, thereby increasing the maintenance and adjustment workload in the construction process, and the application has certain limitations.

[0007] In a possible implementation manner, the auxiliary supporting mechanism comprises a gear ring fixedly connected to the outer portion of the rotating shaft, two horizontally moving assemblies symmetrically distributed at the center and matched with the gear ring, two folding plates respectively arranged on the horizontally opposite sides of the horizontally moving assemblies, and an auxiliary supporting roller rotatably connected to the rear end surface of the folding plate through a rotating rod.

[0008] In a possible implementation manner, the horizontally moving assembly located at the upper portion comprises a bearing seat fixedly connected to the front end surface of the rectangular frame and located above the gear ring, and a sliding rod slidingly connected in the bearing seat, wherein the sliding rod is provided with a column groove at both ends, a sliding column is slidingly connected in the column groove, a U-shaped plate is fixedly connected to the ends of the sliding columns away from each other, a limiting spring is fixedly connected between the end portion of the sliding rod and the vertical segment of the U-shaped plate and sleeved on the outer portion of the sliding column, a rack engaged with the gear ring is fixedly connected to the lower end surface of the U-shaped plate, and the two folding plates are respectively fixedly connected to the horizontally opposite sides of the U-shaped plates in the two horizontally moving assemblies.

[0009] In a possible implementation, the connecting part comprises two support plates fixed symmetrically in front and back on the upper end faces of the rectangular frame and two sliding bars penetratingly connected to the support plates, the distal ends of the two sliding bars are fixedly connected with wheel frames, the wheel frames are rotatably connected with guide wheels symmetrically left and right, and a moving assembly is arranged between the two sliding bars.

[0010] In a possible implementation, the moving assembly comprises a bidirectional screw penetratingly connected to the two support plates, the lower end faces of the sliding bars are fixedly connected with push plates threadedly connected with the bidirectional screw, and the front part of the outer wall of the bidirectional screw is fixedly connected with a push plate.

[0011] In a possible implementation, the surface of the auxiliary supporting roller is gradually recessed towards the side close to the axis from the two ends to the middle part.

[0012] In a possible implementation, the supporting mechanism comprises a C-shaped seat fixedly connected to the lower end face of the rectangular frame through a connecting rod, the cavities on the opposite sides of the C-shaped seat are provided with notches, the sliding blocks are slidingly connected in the notches, the top springs are fixedly connected between the sliding blocks and the notches, the rear side of the sliding block is an arc surface, and the front end faces of the two sliding blocks are inclined surfaces gradually close to the middle line between the two from front to back.

[0013] In a possible implementation, the left and right wall plates of the rectangular frame are provided with half-hip-shaped notched slots for the corresponding cables to enter, and the two half-hip-shaped notched slots are arranged in a central symmetry.

[0014] In a possible implementation, the outer wall of the sliding rod is fixedly connected with two limiting rings for limiting the transverse travel distance of the sliding rod.

[0015] From the above technical solutions, the present application has the following advantages:

[0016] In the present application, the position of the supporting mechanism is dynamically adjusted through the cooperation of the two center-symmetrically arranged cables and the winding drum in the follow-up displacement mechanism, so that the supporting mechanism can be accurately supported in the middle part of the lifting steel wire rope, and the supporting mechanism can always move synchronously and adaptively with the change in the length of the steel wire rope segment between the trolley frame and the distal end of the boom, so as to flexibly cope with the synchronous lengthening and change of the lifting steel wire rope caused by the boom, thereby improving the stability and anti-sag effect of the steel wire rope.

[0017] In the application, the multiple follow-up displacement mechanisms are connected in series to be applicable to the anti-sagging of the long lifting wire rope, the application range is improved, the number of required anti-sagging devices can be reduced by the extension of the release of the cable in the follow-up displacement mechanism, the whole lifting wire rope can be covered by fewer devices compared with the traditional anti-sagging device, the dense arrangement of the devices on the boom is effectively reduced, and the maintenance cost and adjustment workload are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only illustrate the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the provided drawings.

[0019] Figure 1 The structure schematic diagram of the anti-sagging device of the flat head tower crane lifting wire rope provided by the present application.

[0020] Figure 2 The structure schematic diagram of the A part in the present application. Figure 1

[0021] Figure 3 The overall structure rear view angle schematic diagram provided by the present application.

[0022] Figure 4 The winding drum and cable connection structure schematic diagram provided by the present application.

[0023] Figure 5 The connection part structure schematic diagram provided by the present application.

[0024] Figure 6 The right view angle section view installation structure schematic diagram of the supporting mechanism provided by the present application.

[0025] The above drawings include the following reference signs:

[0026] 1, rectangular frame; 2, follow-up displacement mechanism; 21, rotating shaft; 22, reset coil spring; 23, winding drum; 24, cable; 25, connecting hook; 3, supporting mechanism; 31, C-shaped seat; 32, notched opening; 33, sliding block; 4, auxiliary supporting mechanism; 41, gear ring; 42, transverse moving assembly; 421, bearing seat; 422, sliding rod; 423, sliding column; 424, U-shaped plate; 425, limiting spring; 426, rack; 43, folded plate; 44, auxiliary supporting roller; 5, connection part; 51, support plate; 52, sliding bar; 53, wheel frame; 54, I-shaped guide roller; 55, opposite moving assembly; 551, bidirectional screw rod; 552, push plate; 6, half-waist-shaped notched slot; 7, limiting ring. ​DETAILED DESCRIPTION

[0027] In order to make the above objectives, features and advantages of the present application more obvious and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0028] Referring to Figure 1 The present application provides a technical solution: a lifting steel wire rope anti-sagging device of a flat head tower crane, comprising an upper and lower open rectangular frame 1, a follow-up driving mechanism 2 is arranged in the rectangular frame 1 for installation between the trolley frame and the boom so as to automatically adjust the position of the rectangular frame 1 according to the moving position of the trolley frame, a supporting mechanism 3 is arranged at the lower part of the rectangular frame 1 for supporting the lifting steel wire rope to prevent it from sagging, the follow-up driving mechanism 2 is used for indirectly adjusting the position of the supporting mechanism 3 to ensure that the supporting mechanism 3 moves adaptively to the best anti-sagging position of the lifting steel wire rope, auxiliary supporting mechanisms 4 are arranged on the rectangular frame 1 for respectively increasing the anti-sagging range of the lifting steel wire rope from the left and right sides of the rectangular frame 1, and a connecting part 5 is arranged at the upper part of the rectangular frame 1 for quick installation to the boom.

[0029] Referring to Figure 1 and Figure 5 In the embodiment, the connecting part 5 comprises two support plates 51 fixedly connected to the upper end faces of the rectangular frame 1 in front and back symmetry respectively, and sliding bars 52 slidingly connected to the support plates 51, the distal ends of the two sliding bars 52 away from each other are fixedly connected with wheel frames 53, the wheel frames 53 are rotatably connected with I-shaped guide wheels 54 in left and right symmetry, a mutual moving assembly 55 is arranged between the two sliding bars 52, the mutual moving assembly 55 comprises a bidirectional screw 551 rotatably connected to the two support plates 51, the lower end faces of the sliding bars 52 are fixedly connected with push plates 552 in screw connection with the bidirectional screw 551, and the front part of the outer wall of the bidirectional screw 551 is fixedly connected with a push plate.

[0030] Firstly, the rectangular frame 1 is placed between the two guide rails at the lower part of the crane boom, then the bidirectional screw 551 is rotated by manually pushing the push plate or by an external electric device, the two push plates 552 are moved away from each other by the bidirectional screw 551, the sliding bars 52 are moved by the push plates 552, the I-shaped guide wheels 54 are moved by the sliding bars 52 through the wheel frames 53, until the I-shaped guide wheels 54 abut against the guide rails, and the placement and installation of the rectangular frame 1 can be completed by jointly clamping the I-shaped guide wheels 54 corresponding in front and back outside the guide rails.

[0031] Referring to Figure 1and Figure 6 In this embodiment, the supporting mechanism 3 includes a C-shaped seat 31 fixedly connected to the lower end face of the rectangular frame 1 by a connecting rod. The upper and lower opposite side walls of the C-shaped seat 31 are provided with slots 32. Sliding blocks 33 are slidably connected in the slots 32. A top spring is fixedly connected between the sliding blocks 33 and the slots 32. The rear side of the sliding blocks 33 is an arc-shaped surface, and the front end faces of the two sliding blocks 33 are inclined surfaces that gradually approach the centerline side between them from front to back.

[0032] Please see Figure 1 , Figure 3 and Figure 4 The follower-type drive mechanism 2 includes a rotating shaft 21 that is rotatably connected to the front and rear walls of the rectangular frame 1, a reset coil spring 22 that is fixedly connected between the outer wall of the rotating shaft 21 and the rear end face 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 centrally symmetrically distributed and fixedly connected to the outside of the drum 23. The two cables 24 have opposite winding directions, and each cable 24 has a connecting hook 25 at the end away from the drum 23. The left and right walls of the rectangular frame 1 are provided with semi-waist-shaped notches 6 for the corresponding cables 24 to enter. The two semi-waist-shaped notches 6 are centrally symmetrically arranged.

[0033] The hoisting wire rope is pressed against the inclined surfaces of the two sliding blocks 33. The hoisting wire rope pushes the two sliding blocks 33 away from each other through the inclined surfaces at the front of the sliding blocks 33, so that the sliding blocks 33 gradually retract into the slot 32. When the hoisting 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 connected together. At this time, the sliding blocks 33 and the C-shaped seat 31 are together sleeved on the outside of the hoisting wire rope.

[0034] Then, one of the connecting hooks 25 is hooked onto the farthest end of the boom, and the other connecting hook 25 is connected to the trolley frame. When the trolley frame moves, it will drive the cable 24 connected to it to move synchronously. The cable 24 then drives the drum 23 to rotate. The rotation of the drum 23 will release the other cable 24. When the trolley frame moves toward the far end of the boom, the cable 24 connected to the trolley frame will loosen. Then, the reset spring 22 will reset and drive the rotating shaft 21 to reverse. The rotating shaft 21 will then drive the drum 23 to rotate, and the drum 23 can then wind and rewind the cable 24 again.

[0035] The rectangular frame 1 is moved synchronously with the movement of the trolley frame by being wound up or unwound by the two cables 24, and then the C-shaped seat 31 is moved by the rectangular frame 1, so that the C-shaped seat 31 can accurately support the middle part of the lifting wire rope, preventing the wire rope from sagging, and the supporting position of the C-shaped seat 31 is the best point; even if the length of the boom changes, the C-shaped seat 31 can automatically adjust its position according to the length change of the lifting wire rope segment between the trolley frame and the farthest end of the boom, and always keep the best supporting position of the wire rope, so as to ensure that the anti-sagging effect is still effective even in the case of lengthening of the boom or different working states. When the cable 24 is pulled straight, it will enter the half-waist-shaped gap, avoiding the case that the cable 24 is pulled straight to directly contact the rectangular frame 1 and cause scratches.

[0036] In addition, when the length of the boom is long, and the length of the lifting wire rope segment between the farthest end of the boom and the trolley frame is greater than the length of the two cables 24 combined together on the drum 23, the lifting wire rope anti-sagging devices of multiple flat-top tower cranes can be connected together by the connecting hook 25, and then connected to the farthest end of the boom and the trolley frame. Assuming that n lifting wire rope anti-sagging devices of flat-top tower cranes are used, the lifting wire rope anti-sagging devices of flat-top tower cranes will divide the lifting wire rope into n+1 segments, and each lifting wire rope anti-sagging device of flat-top tower crane is located at the middle position of the divided lifting wire rope segment, ensuring that the supporting position is the best point; at the same time, since the cable 24 in each lifting wire rope anti-sagging device of flat-top tower crane can be unwound and elongated, the number of anti-sagging devices needed to be installed on the boom is greatly reduced compared to the existing anti-sagging devices.

[0037] Please refer to Figure 1 and Figure 3 In the embodiment, the auxiliary supporting mechanism 4 includes a gear ring 41 fixedly connected to the outside of the rotating shaft 21, two horizontally moving assemblies 42 symmetrically distributed at the center to cooperate with the gear ring 41, two foldable plates 43 respectively arranged on the horizontally opposite sides of the horizontally moving assemblies 42, and an auxiliary supporting roller 44 rotatably connected to the rear end surface of the foldable plate 43 through a rotating rod, the surface of the auxiliary supporting roller 44 is gradually recessed towards the side close to its own axis from both ends to the middle part.

[0038] Please refer to Figure 1 and Figure 2The upper horizontal moving assembly 42 comprises 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 penetratingly and slidably connected in the bearing seat 421, both ends of the sliding rod 422 are provided with column grooves in which sliding columns 423 are slidably connected, the mutually distal ends of the two sliding columns 423 are fixedly connected with a U-shaped plate 424, a limiting spring 425 slidably sleeved outside 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, the lower end face of the U-shaped plate 424 is fixedly connected with a gear rack 426 engaged with the gear ring 41, two foldable plates 43 are fixedly connected to the transversely opposite sides of the U-shaped plate 424 in the two horizontal moving assemblies 42 respectively, and the outer wall of the sliding rod 422 is fixedly connected with two limiting stop rings 7 for limiting the horizontal moving stroke distance of the sliding rod 422.

[0039] When the lifting steel wire rope is penetrated into the C-shaped seat 31 and is supported on the auxiliary supporting roller 44, when the inhaul cable 24 is pulled out to drive the drum 23 to rotate, the drum 23 drives the rotating shaft 21 to rotate, the rotating shaft 21 drives the gear ring 41 to rotate, the gear ring 41 drives the gear rack 426 to move, the two gear racks 426 move away from each other, the gear rack 426 drives the U-shaped plate 424 to move, the U-shaped plate 424 drives the sliding rod 422 to move through the sliding column 423 and the limiting spring 425, the sliding rod 422 horizontally slides in the bearing seat 421, and the U-shaped plate 424 drives the auxiliary supporting roller 44 to synchronously move through the foldable plate 43 and the rotating rod, the two auxiliary supporting rollers 44 synchronously move away from the rectangular frame 1, the auxiliary supporting roller 44 moves to the side to further increase the supporting range of the lifting steel wire rope, further improve the anti-sag effect of the lifting steel wire rope, and the gradually concave arc surface of the surface of the auxiliary supporting roller 44 enables the lifting steel wire rope to be better limited on the auxiliary supporting roller 44, reduces the risk of sliding deviation of the steel wire rope, and maintains the stability.

[0040] When the auxiliary supporting roller 44 moves away from the rectangular frame 1 to the farthest position, the sliding rod 422 drives the limiting stop ring 7 to abut against the bearing seat 421, so that the sliding rod 422 is clamped, but at this time, the inhaul cable 24 has not been completely pulled out, so the drum 23 continues to rotate, the drum 23 drives the rotating shaft 21 to continue to rotate, the rotating shaft 21 drives the gear ring 41 to continue to rotate normally, the gear ring 41 drives the U-shaped plate 424 to horizontally move through the gear rack 426 at this time, the U-shaped plate 424 drives the sliding column 423 to slide in the column groove, so that the limiting spring 425 is in a compressed state, and the limiting spring 425 enables the gear rack 426 to be located at the first tooth on the side which always abuts against the gear ring 41 at this time.

[0041] When the rotating shaft 21 is reversed under the action of the reset reel 23, the rotating shaft 21 reverses the gear ring 41, the gear ring 41 drives the U-shaped plate 424 to move towards the direction of the rectangular frame 1 through the rack 426, the U-shaped plate 424 synchronously moves the auxiliary supporting roller 44 through the folded plate 43 and the rotating rod, until the auxiliary supporting roller 44 moves to the initial position, at this time, the other limiting block ring 7 abuts against the bearing seat 421, so that the slide rod 422 is clamped, and then the steps of clamping the slide rod 422 can be repeated.

[0042] In operation, first, the rectangular frame 1 is slidably installed on the boom by the connecting part 5, then the two connecting hooks 25 in the follow-up driving mechanism 2 are connected to the distal end of the boom and the trolley frame respectively, and the lifting steel wire rope is passed through the supporting mechanism 3, the follow-up driving mechanism 2 is operated according to the length change of the lifting steel wire rope segment between the trolley frame and the distal 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 at the middle position of the lifting steel wire rope to be supported, at the same time, the auxiliary supporting mechanism 4 also operates synchronously, and the auxiliary supporting mechanism 4 further supports the lifting steel wire rope through the two auxiliary supporting rollers 44 distributed on the side of the rectangular frame 1, so that the drooping of the lifting steel wire rope is avoided.

[0043] In addition, the lifting steel wire rope anti-sagging devices of the plurality of flat-head tower cranes can be connected in series according to the length of the lifting steel wire rope segment between the distal end of the boom and the trolley frame, so that the lifting steel wire rope is supported at multiple points, and the number of anti-sagging devices to be installed on the boom is greatly reduced compared with the existing anti-sagging method.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In addition, the terms "first", "second", "one", "two" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second", "one", "two" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0046] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] The embodiments of the specific implementation are the preferred embodiments of the present application, not limited by the protection scope of the present application, therefore, any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A device for preventing the sagging of the hoisting wire rope of a topless tower crane, comprising a rectangular frame (1) open at the top and bottom, characterized in that: The rectangular frame (1) is provided with a follow-up driving mechanism (2) for mounting between the trolley frame and the boom to automatically adjust the position of the rectangular frame (1) according to the moving position of the trolley frame, the lower part of the rectangular frame (1) is provided with a supporting mechanism (3) for supporting the lifting steel wire to prevent it from sagging, and 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) moves to the best anti-sagging position of the lifting steel wire; The follow-up driving mechanism (2) comprises: A rotating shaft (21) penetratingly connected to the front and rear wall plates of the rectangular frame (1), a reset 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 winding drum (23) fixedly connected to the outside of the rotating shaft (21) and located in the rectangular frame (1), and two center-symmetrically distributed cables (24) wound and fixedly connected to the outside of the winding drum (23), the winding directions of the two cables (24) being opposite, and each end of the cable (24) away from the winding drum (23) being provided with a connecting hook (25); The rectangular frame (1) is provided with an auxiliary supporting mechanism (4) for increasing the anti-sagging range of the lifting steel wire from the left and right sides of the rectangular frame (1), respectively, and the upper part of the rectangular frame (1) is provided with a connecting part (5) for quick mounting to the boom; The auxiliary supporting mechanism (4) comprises a gear ring (41) fixedly connected to the outside of the rotating shaft (21), two center-symmetrically distributed horizontal moving assemblies (42) for cooperating with the gear ring (41), two foldable plates (43) respectively provided on the horizontally opposite sides of the horizontal moving assemblies (42), and an auxiliary supporting roller (44) rotatably connected to the rear end surface of the foldable plate (43) through a rotating rod; The upper horizontal moving assembly (42) 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) penetratingly and slidingly connected in the bearing seat (421), the sliding rod (422) being provided with a column groove at each end, a sliding column (423) slidingly connected in the column groove, a U-shaped plate (424) fixedly connected to the ends of the two sliding columns (423) away from each other, a limiting spring (425) slidingly sleeved outside the sliding column (423) and fixedly connected between the end of the sliding rod (422) and the vertical section of the U-shaped plate (424), a rack (426) fixedly connected to the lower end surface of the U-shaped plate (424) and engaged with the gear ring (41), and two foldable plates (43) respectively fixedly connected to the horizontally opposite sides of the U-shaped plate (424) in the two horizontal moving assemblies (42).

2. A fall arrest device for a flat-top tower crane according to claim 1, characterized in that: The connecting part (5) comprises two support plates (51) fixedly connected to the upper end surface of the rectangular frame (1) in front and back symmetry, and sliding bars (52) penetratingly and slidingly connected to the support plates (51), the ends of the two sliding bars (52) away from each other being fixedly connected with wheel frames (53), the wheel frames (53) being rotatably connected with I-shaped guide wheels (54) in left and right symmetry, and a facing moving assembly (55) being provided between the two sliding bars (52).

3. A fall arrest device for a flat-top tower crane according to claim 2, characterized in that: The opposite moving assembly (55) comprises a bidirectional screw rod (551) penetratingly connected to the two support plates (51), the lower end surface of the sliding bar (52) is fixedly connected with a push plate (552) in threaded connection with the bidirectional screw rod (551), and the outer wall of the bidirectional screw rod (551) is fixedly connected with a push plate.

4. A fall arrest device for a flat-top tower crane according to claim 1, characterized in that: The surface of the auxiliary supporting roller (44) is recessed towards the side close to the axis thereof from the two ends to the middle part.

5. A flat-top tower crane's hoisting wire rope anti-sagging device 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, the upper and lower opposite side cavities of the C-shaped seat (31) are both provided with a notch (32), the sliding block (33) is slidingly connected in the notch (32), the top spring is fixedly connected between the sliding block (33) and the notch (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 gradually close to the middle line side between the two from front to back.

6. A flat-top tower crane's hoisting wire rope anti-sagging device according to claim 1, characterized in that: The left and right wall plates of the rectangular frame (1) are both provided with a half-waist-shaped notched slot (6) for the corresponding inhaul cable (24) to enter, and the two half-waist-shaped notched slots (6) are centrally symmetrically arranged.

7. A flat-top tower crane's hoisting wire rope anti-sagging device according to claim 1, characterized in that: The outer wall of the sliding rod (422) is fixedly connected with two limiting stop rings (7) for limiting the transverse stroke distance of the sliding rod (422).

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