A tower crane anti-rope breaking device

Abstract

The present invention relates to the technical field of vertical lifting machinery safety equipment, and discloses a tower crane anti-rope breaking device, comprising a lifting rope, a load trolley and a hook arranged on a lifting arm, four fixed pulleys are arranged in the hook, two movable pulleys are arranged in the hook, a cable pulling device is arranged on the short arm of the lifting arm, the lifting rope starts from the cable pulling device and passes through a tugboat, a lifting weight limiter, an arm follower pulley, a first fixed pulley, a first movable pulley, a second fixed pulley, a third fixed pulley and a fourth fixed pulley in sequence, and is then fixedly connected to an anti-twisting device at the other end of the lifting arm; a broken rope locker is arranged in the load trolley, a portion of the lifting rope between the second fixed pulley and the third fixed pulley passes through the broken rope locker, and the broken rope locker can lock the lifting rope when the speed of the lifting rope exceeds the outlet speed of the cable pulling device, and no matter whether the broken portion of the lifting rope is before or after the broken rope locker, the other section still has a pair of pulley blocks connected to the lifting hook.

Description

Technical Field

[0001] The invention relates to the technical field of vertical hoisting machinery safety equipment, in particular to a tower crane rope-breaking prevention device. Background Art

[0002] Tower cranes are widely used in construction, large equipment installation and other engineering fields as lifting equipment, playing a vital role in lifting materials and components. They have the advantages of high lifting height, large working range, strong lifting capacity, etc., which can effectively improve the efficiency and quality of engineering construction and meet the construction needs of high-rise buildings and large industrial projects.

[0003] However, during the use of tower cranes, wire rope breakage is a serious safety hazard. It may be caused by a variety of reasons: fatigue damage, due to the frequent lifting and lowering operations of the crane, the wire rope is subjected to alternating loads for a long time; wear problems, tower cranes operate in a complex construction site environment, and the wire rope will inevitably rub against the surrounding objects; corrosion factors, the environmental conditions at the construction site have a greater impact on the corrosion of the wire rope.

[0004] At present, although there are some preventive measures for the problem of broken ropes on tower cranes, there are many limitations. Manual regular inspection is a common preventive method, but this method has the problems of long inspection cycle and difficulty in real-time monitoring. Although non-destructive testing technologies such as ultrasonic and magnetic particle testing can detect some defects inside and on the surface of wire ropes, these technologies usually require professional equipment and personnel to operate, and the detection process is relatively complicated, making it difficult to carry out real-time monitoring during the normal operation of tower cranes.

[0005] Therefore, it is necessary to design a device to prevent the hook from falling at the moment the lifting rope breaks. Patent publication number CN203638992U discloses a tower crane anti-rope breaking device. The patent uses a double-rope safety system so that when the active wire rope is broken, the passive wire rope bears the load, thereby preventing the occurrence of falling accidents. However, the double-rope structure increases the complexity of the structure, and the double ropes are intertwined and easily cause friction loss.

[0006] In summary, the existing lifting rope anti-breaking devices still have the following defects: 1. They are unable to cope with the breakage of different sections of the lifting rope; 2. When the lifting rope breaks, the hook is prone to fall directly or tilt, causing the cargo to become unhooked; 3. When the anti-breaking device fails, there is a lack of a more stable backup device for locking. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies in the prior art, the present invention provides a tower crane rope-breaking prevention device, which has the advantages of being able to quickly lock the lifting rope when different sections of the lifting rope break, and prevent the hook from falling or tilting and causing unhooking, thereby solving the problems of the above-mentioned background technology.

[0009] (II) Technical solution

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A tower crane anti-rope breaking device comprises a hoisting rope, a load trolley and a hook arranged on a boom, wherein a first fixed pulley, a second fixed pulley, a third fixed pulley and a fourth fixed pulley are arranged in the load trolley, a first movable pulley and a second movable pulley are arranged in the hook, a cable pulling device is arranged on the short arm of the boom, the hoisting rope starts from the cable pulling device and passes through a tugboat, a lifting weight limiter and an arm heel pulley in sequence before reaching the load trolley, and after entering the load trolley, the hoisting rope passes through the first fixed pulley, the first movable pulley, the second fixed pulley, the third fixed pulley and the fourth fixed pulley in sequence before being fixedly connected to an anti-twist device at the other end of the boom;

[0012] A broken rope locker is provided in the load-carrying trolley, and the broken rope locker is fixed at a position between the second fixed pulley and the third fixed pulley in the load-carrying trolley. The part of the lifting rope between the second fixed pulley and the third fixed pulley passes through the broken rope locker. The broken rope locker can lock the lifting rope when the speed of the lifting rope exceeds the outlet speed of the cable pulling device. No matter whether the broken part of the lifting rope is before or after the broken rope locker, the other section still has a pair of pulley blocks connected to the hook.

[0013] Preferably, the portion of the lifting rope located before the cable pulling device to the first fixed pulley is the front rope segment, the portion of the lifting rope located between the first fixed pulley and the second fixed pulley is the first pulley segment, the portion of the lifting rope located between the second fixed pulley and the third fixed pulley is the connecting segment, the portion of the lifting rope located between the third fixed pulley and the fourth fixed pulley is the second pulley segment, and the portion of the lifting rope located after the fourth fixed pulley to the anti-twist device is the rear rope segment;

[0014] The broken rope locker is arranged at the position of the connecting section, and the hook is respectively provided with at least one broken rope locker at the parts corresponding to the first pulley section and the second pulley section. The broken rope locker on the hook is fixedly connected to the hook, and the broken rope locker on the hook can be linked with the broken rope locker in the load-carrying trolley to produce double protection while avoiding the hook from tilting due to only one pulley block being left.

[0015] Preferably, the broken rope locker comprises a housing, in which four mutually symmetrical centrifugal protection wheels located in the same horizontal plane are arranged, and any centrifugal protection wheel comprises:

[0016] The circular wheel has an outer ring part that fits on the lifting rope. When the lifting rope slides, the circular wheel is driven to rotate. Both ends of the circular wheel are provided with a plurality of centrifugal locking parts arranged in a circumference. Any centrifugal locking part includes an arc-shaped plug-in block, a slide rod and a support block. One end of the arc-shaped plug-in block is rotatably connected to the end face of the circular wheel, and the inner side of the other end is slidably connected to the slide rod. The other end of the slide rod is slidably connected to the support block. A spring is provided between the support block and the slide rod. The support block is fixed on the circular wheel or the support block and the circular wheel are an integrated structure. When the circular wheel rotates rapidly, the arc-shaped plug-in block is rotated outwards by the centrifugal force.

[0017] A locking ring is rotatably connected to the outer side of the round wheel end, and an arc-shaped slot is arranged on the inner side of the locking ring. When the arc-shaped plug is rotated outward, it is inserted into the arc-shaped slot, so that the locking ring and the round wheel are locked;

[0018] An eccentric crescent is provided on the outer side of the lock ring. A groove and a convex key are provided at the connection between the eccentric crescent and the lock ring respectively. The eccentric crescent is a crescent-shaped cam with an eccentric structure. The rotation centers of the round wheel, the lock ring and the eccentric crescent are coaxial. The crescent-shaped opening position of the eccentric crescent is aligned with the position of the lifting rope under normal conditions.

[0019] The end covers are arranged on the upper and lower sides of the eccentric crescent and are used to fix the locking ring and the round wheel in the eccentric crescent. The end covers are rotatably connected to the shell.

[0020] Preferably, the lifting capacity limiter, the first fixed pulley, the second fixed pulley, the third fixed pulley and the fourth fixed pulley are all provided with pin-type pressure sensors for detecting the pressure exerted on each pulley, so as to determine the specific location of the fracture.

[0021] Preferably, the broken rope locker is also provided with a hydraulic clamp for electrically clamping the lifting rope. When the pin-type pressure sensor detects a pressure change, the lifting rope is clamped by the hydraulic clamp to lock the lifting rope.

[0022] Preferably, guide wheels are provided in the broken rope locker at upper and lower positions of the lifting rope, so as to position the lifting rope at the outer ring position of the circular wheel for sliding.

[0023] Preferably, the outer side of the eccentric crescent is also provided with a plurality of convex teeth arranged in a circumference protruding outwards.

[0024] Preferably, a slide rail is provided at the bottom of the lifting arm, and a sliding roller and an anti-drop support plate are provided at a position of the load-carrying trolley corresponding to the slide rail, the sliding roller rolls in the slide rail, and the anti-drop support plate slides in the slide rail.

[0025] Preferably, the pulling cable device includes a driving motor and a drum, the driving motor and the rotating shaft of the drum are arranged in a gear box and are connected through gear meshing, the drum is driven to rotate by the driving motor, and the starting end of the lifting rope is wound around the drum.

[0026] Preferably, the front and rear positions of the load-carrying trolley are respectively connected to the front and rear positions, and a drum driven to rotate by a motor is arranged at one end close to the root of the boom. The starting ends of the front and rear traction ropes are wound around the drum in different directions, the terminal end of the front traction rope is fixed to the front side of the load-carrying trolley, and the terminal end of the rear traction rope is fixed to the rear side of the load-carrying trolley after passing through a pulley arranged at the far end of the boom.

[0027] (III) Beneficial effects

[0028] Compared with the prior art, the present invention provides a tower crane anti-rope breaking device, which has the following beneficial effects:

[0029] 1. The anti-broken rope device of the tower crane is provided with four fixed pulleys in the load trolley and two movable pulleys in the hook. The two fixed pulleys and one movable pulley form a pulley block. A broken rope locker is provided in the middle part of the two pulley blocks. No matter whether the broken part of the lifting rope is before or after the broken rope locker, the other section still has a pair of pulley blocks connected to the hook. It only needs to increase the number of pulleys and provide a broken rope locker to achieve the purpose of quickly locking the lifting rope to prevent the hook from falling when the lifting rope breaks in different sections, and the existing lifting rope structure is changed little.

[0030] 2. The anti-rope-breaking device of the tower crane is provided with at least one broken rope locker at the parts corresponding to the first pulley section and the second pulley section respectively. The broken rope locker on the load trolley is fixedly connected to the load trolley. The broken rope locker on the load trolley can be linked with the broken rope locker in the load trolley to produce double protection while preventing the load trolley from tilting due to only one pulley block being left.

[0031] 3. The tower crane rope-breaking prevention device is provided with pin-type pressure sensors in the lifting weight limiter, the first fixed pulley, the second fixed pulley, the third fixed pulley and the fourth fixed pulley to detect the pressure on each pulley, so as to determine the specific position of the break.

[0032] 4. The anti-broken rope device of the tower crane, when the lifting rope breaks, the sliding speed of the lifting rope part in the broken rope locker is accelerated, driving the round wheel to rotate rapidly, and the centrifugal force of the rapid rotation of the round wheel causes the arc plug to rotate outward, and the arc plug is inserted into the arc slot after rotating outward, so that the round wheel and the locking ring are locked, and the round wheel drives the locking ring to rotate at this time, because an eccentric crescent is fixed on the outside of the locking ring, and the eccentric crescent is an eccentric wheel structure, and the eccentric crescent squeezes the lifting rope during rotation, and the two eccentric crescents on both sides rotate inward at the same time to clamp the lifting rope to complete the locking of the lifting rope.

[0033] 5. The tower crane anti-rope breaking device divides the cam into two parts, a locking ring and an eccentric crescent, and fixes the locking ring and the eccentric crescent through a convex key and a groove. When installing, it is only necessary to slide the locking ring and the round wheel into the eccentric crescent in sequence, and the installation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the tower crane of the present invention.

[0035] Figure 2 It is a schematic structural diagram of the lifting arm of the present invention.

[0036] Figure 3 It is a schematic structural diagram of the lifting rope of the present invention.

[0037] Figure 4 It is a schematic structural diagram of the cable device of the present invention.

[0038] Figure 5 It is a schematic structural diagram of the sliding part of the load-carrying trolley on the slide rail of the present invention.

[0039] Figure 6 It is a structural schematic diagram of the bottom of the load-carrying trolley of the present invention.

[0040] Figure 7 It is a structural schematic diagram of the hook of the present invention.

[0041] Figure 8 It is an exploded view of the internal structure of the rope breaking locker of the present invention.

[0042] Fig. 9 It is a structural schematic diagram of the centrifugal protection wheel of the present invention.

[0043] Fig.10 It is an exploded view of the centrifugal protection wheel of the present invention.

[0044] Fig.11 It is a structural schematic diagram of the circular wheel of the present invention.

[0045] Fig.12 It is a schematic structural diagram of the eccentric crescent of the present invention.

[0046] Fig.13 It is a schematic structural diagram of the lock ring of the present invention.

[0047] Fig.14 It is a top view of the cooperation of the round wheel, the lock ring and the eccentric crescent of the present invention.

[0048] Fig.15 It is a schematic structural diagram of four symmetrical centrifugal protection wheels of the present invention.

[0049] In the figure: 1, crane arm; 2, lifting rope; 3, load trolley; 4, hook; 11, slide rail; 21, front rope section; 22, first pulley section; 23, connecting section; 24, second pulley section; 25, rear rope section; 301, first fixed pulley; 302, second fixed pulley; 303, third fixed pulley; 304, fourth fixed pulley; 31, sliding roller; 32, anti-drop support plate; 401, first movable pulley; 402, second movable pulley; 51, cable device; 52, tugboat; 53, crane Weight limiter; 54, arm pulley; 55, anti-twist device; 511, drive motor; 512, reel; 513, gear box; 9, broken rope lock; 90, housing; 91, centrifugal protection wheel; 92, guide wheel; 911, round wheel; 912, locking ring; 913, eccentric crescent; 914, end cover; 9121, arc slot; 9122, convex key; 9131, convex tooth; 9132, groove; 8, centrifugal lock; 81, arc plug block; 82, slide rod; 83, support block. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0052] In addition, the terms "first" and "second" 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" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] Embodiment 1:

[0054] This embodiment provides a tower crane rope-breaking prevention device having the following technical features.

[0055] See also Figure 1-15 A tower crane anti-rope breaking device comprises a lifting rope 2, a load trolley 3 and a hook 4 arranged on a boom 1, wherein the load trolley 3 is provided with a first fixed pulley 301, a second fixed pulley 302, a third fixed pulley 303 and a fourth fixed pulley 304, wherein the hook 4 is provided with a first movable pulley 401 and a second movable pulley 402, and a cable device 51 is provided on the short arm of the boom 1, wherein the lifting rope 2 starts from the cable device 51 and sequentially passes through a tugboat 52, a lifting weight limiter 53 and an arm heel pulley 54 before reaching the load trolley 3, wherein the lifting rope 2 enters the load trolley 3 and sequentially passes through the first fixed pulley 301, the first movable pulley 401, the second fixed pulley 302, the third fixed pulley 303 and the fourth fixed pulley 304 before being fixedly connected to the anti-twist device 55 at the other end of the boom 1;

[0056] A broken rope locker 9 is provided in the load-carrying trolley 3, and the broken rope locker 9 is fixed at a position between the second fixed pulley 302 and the third fixed pulley 303 in the load-carrying trolley 3. The portion of the lifting rope 2 between the second fixed pulley 302 and the third fixed pulley 303 passes through the broken rope locker 9. The broken rope locker 9 can lock the lifting rope 2 when the speed of the lifting rope 2 exceeds the outlet speed of the cable pulling device 51. No matter whether the broken portion of the lifting rope 2 is before or after the broken rope locker 9, the other section still has a pair of pulley blocks connected to the hook 4.

[0057] In an optional embodiment, the portion of the lifting rope 2 located between the cable device 51 and the first fixed pulley 301 is the front rope segment 21, the portion of the lifting rope 2 located between the first fixed pulley 301 and the second fixed pulley 302 is the first pulley segment 22, the portion of the lifting rope 2 located between the second fixed pulley 302 and the third fixed pulley 303 is the connecting segment 23, the portion of the lifting rope 2 located between the third fixed pulley 303 and the fourth fixed pulley 304 is the second pulley segment 24, and the portion of the lifting rope 2 located after the fourth fixed pulley 304 to the anti-twist device 55 is the rear rope segment 25;

[0058] The broken rope locker 9 is arranged at the position of the connecting section 23, and the hook 4 is respectively provided with at least one broken rope locker 9 at the parts corresponding to the first pulley section 22 and the second pulley section 24. The broken rope locker 9 on the hook 4 is fixedly connected to the hook 4. The broken rope locker 9 on the hook 4 can be linked with the broken rope locker 9 in the load-carrying trolley 3 to produce double protection while avoiding the hook 4 from tilting due to only one pulley block being left.

[0059] In an optional embodiment, the broken rope lock 9 includes a housing 90, in which four mutually symmetrical centrifugal protection wheels 91 located on the same horizontal plane are arranged, and any centrifugal protection wheel 91 includes:

[0060] The outer ring of the round wheel 911 is fitted on the lifting rope 2. When the lifting rope 2 slides, the round wheel 911 is driven to rotate. Both ends of the round wheel 911 are provided with a plurality of centrifugal locks 8 arranged in a circumference. Any centrifugal lock 8 includes an arc-shaped plug 81, a slide bar 82 and a support block 83. One end of the arc-shaped plug 81 is rotatably connected to the end face of the round wheel 911, and the other end is slidably connected to the slide bar 82 on the inner side. The other end of the slide bar 82 is slidably connected to the support block 83. A spring is provided between the support block 83 and the slide bar 82. The support block 83 is fixed on the round wheel 911 or the support block 83 and the round wheel 911 are an integrated structure. When the round wheel 911 rotates rapidly, the arc-shaped plug 81 is subjected to the centrifugal force and rotates outward.

[0061] The locking ring 912 is rotatably connected to the outer side of the round wheel 911, and an arc-shaped slot 9121 is provided inside the locking ring 912. When the arc-shaped plug 81 rotates outward, it is inserted into the arc-shaped slot 9121, so that the locking ring 912 and the round wheel 911 are locked;

[0062] An eccentric crescent 913 is provided on the outer side of the locking ring 912. A groove 9132 and a convex key 9122 are provided at the connection between the eccentric crescent 913 and the locking ring 912. The eccentric crescent 913 is a crescent-shaped cam with an eccentric structure. The rotation centers of the round wheel 911, the locking ring 912 and the eccentric crescent 913 are coaxial. The crescent-shaped opening position of the eccentric crescent 913 is aligned with the position of the lifting rope 2 under normal conditions.

[0063] The end cover 914 is arranged on the upper and lower sides of the eccentric crescent 913 and is used to fix the locking ring 912 and the circular wheel 911 in the eccentric crescent 913 . The end cover 914 is rotatably connected to the housing 90 .

[0064] In an optional embodiment, the lifting weight limiter 53, the first fixed pulley 301, the second fixed pulley 302, the third fixed pulley 303 and the fourth fixed pulley 304 are all provided with pin-type pressure sensors for detecting the pressure applied to each pulley, so as to determine the specific location of the fracture.

[0065] In an optional embodiment, the broken rope locker 9 is further provided with a hydraulic clamp for electrically clamping the lifting rope 2. When the pin-type pressure sensor detects a pressure change, the lifting rope 2 is clamped by the hydraulic clamp to lock the lifting rope 2.

[0066] In an optional embodiment, guide wheels 92 are further provided in the broken rope locker 9 at upper and lower positions of the lifting rope 2, for positioning the lifting rope 2 at the outer ring position of the circular wheel 911 for sliding.

[0067] In an optional embodiment, the outer side of the eccentric crescent 913 is further provided with a plurality of convex teeth 9131 arranged in a circumference protruding outward.

[0068] In an optional embodiment, a slide rail 11 is provided at the bottom of the lifting arm 1, and a sliding roller 31 and an anti-drop support plate 32 are provided at a position of the load-carrying trolley 3 corresponding to the slide rail 11, the sliding roller 31 rolls in the slide rail 11, and the anti-drop support plate 32 slides in the slide rail 11.

[0069] In an optional embodiment, the cable pulling device 51 includes a driving motor 511 and a drum 512. The rotating shafts of the driving motor 511 and the drum 512 are arranged in a gear box 513 and are connected through gear meshing. The drum 512 is driven to rotate by the driving motor 511, and the starting end of the lifting rope 2 is wound around the drum 512.

[0070] In an optional embodiment, the front and rear positions of the load-carrying trolley 3 are respectively connected to a front traction rope and a rear traction rope, and a drum driven to rotate by a motor is arranged at one end close to the root of the boom 1. The starting ends of the front traction rope and the rear traction rope are wound on the drum in different directions. The terminal end of the front traction rope is fixed on the front side of the load-carrying trolley 3, and the terminal end of the rear traction rope is fixed on the rear side of the load-carrying trolley 3 after passing through a pulley arranged at the far end of the boom 1. To sum up, the anti-broken rope device of the tower crane is configured by arranging four fixed pulleys in the load trolley 3 and two movable pulleys in the hook 4. The two fixed pulleys and one movable pulley form a pulley block, and a broken rope locker 9 is arranged in the middle part of the two pulley blocks. No matter whether the broken part of the lifting rope 2 is before the broken rope locker 9 or after the broken rope locker 9, the other section still has a pair of pulley blocks connected to the hook 4. It only needs to increase the number of pulleys and arrange a broken rope locker 9 to achieve the purpose of quickly locking the lifting rope to prevent the hook from falling when the lifting rope 2 breaks in different sections, and the existing lifting rope structure is changed little.

[0071] In an optional embodiment, a wedge-shaped joint is provided in the anti-twist device 55 to fix the end of the lifting rope 2 to prevent the lifting rope 2 from rotating.

[0072] In summary, the anti-rope-breaking device of the tower crane is provided with at least one broken rope locker 9 at the parts corresponding to the first pulley segment 22 and the second pulley segment 24 respectively. The broken rope locker 9 on the load-carrying trolley 3 is fixedly connected to the load-carrying trolley 3. The broken rope locker 9 on the load-carrying trolley 3 can cooperate with the broken rope locker 9 in the load-carrying trolley 3 to produce double protection while preventing the load-carrying trolley 3 from tilting due to only one pulley group being left.

[0073] The tower crane rope-breaking prevention device is provided with pin-type pressure sensors in the lifting weight limiter 53, the first fixed pulley 301, the second fixed pulley 302, the third fixed pulley 303 and the fourth fixed pulley 304, so as to detect the pressure on each pulley, thereby determining the specific position of the break.

[0074] The anti-rope-breaking device of the tower crane, when the lifting rope 2 breaks, the sliding speed of the part of the lifting rope 2 in the broken rope locker 9 is accelerated, driving the round wheel 911 to rotate rapidly, and the centrifugal force of the rapid rotation of the round wheel 911 causes the arc plug block 81 to rotate outward, and the arc plug block 81 is inserted into the arc slot 9121 after rotating outward, so that the round wheel 911 and the locking ring 912 are locked, and at this time, the round wheel 911 drives the locking ring 912 to rotate, because the eccentric crescent 913 is also fixed on the outside of the locking ring 912, and the eccentric crescent 913 is an eccentric wheel structure, the eccentric crescent 913 squeezes the lifting rope 2 during the rotation process, and the two eccentric crescents 913 on both sides rotate inward at the same time to clamp the lifting rope 2 to complete the locking of the lifting rope 2.

[0075] The anti-rope-breaking device for a tower crane is manufactured by dividing a cam into two parts, namely a locking ring 912 and an eccentric crescent 913, and fixing the locking ring 912 and the eccentric crescent 913 by means of a convex key 9122 and a groove 9132. During installation, the locking ring 912 and the round wheel 911 need only be slid into the eccentric crescent 913 in sequence, and the installation is simple and convenient.

[0076] It should be noted that, in this article, relational terms such as first and second, etc. 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 "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tower crane anti-rope breaking device, comprising a hoisting rope (2), a load trolley (3) and a hook (4) arranged on a crane arm (1), characterized in that: The load-carrying trolley (3) is provided with a first fixed pulley (301), a second fixed pulley (302), a third fixed pulley (303) and a fourth fixed pulley (304); the hook (4) is provided with a first movable pulley (401) and a second movable pulley (402); and a cable pulling device (51) is provided on the balance arm of the lifting arm (1); The lifting rope (2) starts from the cable pulling device (51) and passes through the tugboat (52), the lifting weight limiter (53) and the arm heel pulley (54) in sequence before arriving at the load-carrying trolley (3). After entering the load-carrying trolley (3), the lifting rope (2) passes through the first fixed pulley (301), the first movable pulley (401), the second fixed pulley (302), the third fixed pulley (303) and the fourth fixed pulley (304) in sequence before being fixedly connected to the anti-twist device (55) at the end of the lifting arm (1) away from the balance arm; A broken rope locker (9) is provided in the load-carrying trolley (3), and the broken rope locker (9) is fixed at a position between the second fixed pulley (302) and the third fixed pulley (303) in the load-carrying trolley (3), and the portion of the lifting rope (2) between the second fixed pulley (302) and the third fixed pulley (303) passes through the broken rope locker (9); The portion of the lifting rope (2) located between the cable pulling device (51) and the first fixed pulley (301) is the front rope segment (21), the portion of the lifting rope (2) located between the first fixed pulley (301) and the second fixed pulley (302) is the first pulley segment (22), the portion of the lifting rope (2) located between the second fixed pulley (302) and the third fixed pulley (303) is the connecting segment (23), the portion of the lifting rope (2) located between the third fixed pulley (303) and the fourth fixed pulley (304) is the second pulley segment (24), and the portion of the lifting rope (2) located after the fourth fixed pulley (304) to the anti-twist device (55) is the rear rope segment (25); The broken rope locker (9) is arranged at the position of the connecting section (23); the hook (4) is provided with at least one broken rope locker (9) at the parts corresponding to the first pulley section (22) and the second pulley section (24); the broken rope locker (9) on the hook (4) is fixedly connected to the hook (4); the broken rope locker (9) on the hook (4) can be linked with the broken rope locker (9) in the load trolley (3) to produce double protection, while preventing the hook (4) from tilting due to only one pulley block being left.

2. A tower crane rope-breaking prevention device according to claim 1, characterized in that: The broken rope locker (9) comprises a housing (90), wherein four mutually symmetrical centrifugal protection wheels (91) located on the same horizontal plane are arranged in the housing (90), and each centrifugal protection wheel (91) comprises: A round wheel (911), the outer ring of which is fitted on the lifting rope (2), and the lifting rope (2) drives the round wheel (911) to rotate when it slides. A plurality of centrifugal locking members (8) arranged in a circumference are arranged at both ends of the round wheel (911), and any centrifugal locking member (8) comprises an arc-shaped plug-in block (81), a slide rod (82) and a support block (83). One end of the arc-shaped plug-in block (81) is rotatably connected to the end face of the round wheel (911), and the other end is slidably connected to the slide rod (82) on the inner side. One end of the slide rod (82) away from the arc-shaped plug-in block (81) is slidably connected in the support block (83). A spring is arranged between the support block (83) and the slide rod (82). The support block (83) is fixed on the round wheel (911) or the support block (83) and the round wheel (911) are an integral structure. When the round wheel (911) rotates rapidly, the arc-shaped plug-in block (81) is rotated outwards under the action of centrifugal force; A locking ring (912) is rotatably connected to the outer side of the end of the round wheel (911), an arc-shaped slot (9121) is provided on the inner side of the locking ring (912), and the arc-shaped insert block (81) is inserted into the arc-shaped slot (9121) when rotating outward, so that the locking ring (912) and the round wheel (911) are locked; An eccentric crescent (913), wherein the outer side of the locking ring (912) is provided with an eccentric crescent (913), and a groove (9132) and a convex key (9122) are respectively provided at the connection between the eccentric crescent (913) and the locking ring (912), wherein the eccentric crescent (913) is a crescent-shaped cam with an eccentric structure, and the rotation centers of the circular wheel (911), the locking ring (912) and the eccentric crescent (913) are coaxial, and the crescent-shaped opening position of the eccentric crescent (913) is aligned with the position of the lifting rope (2) under normal conditions; The end covers (914) are arranged on the upper and lower sides of the eccentric crescent (913) and are used to fix the locking ring (912) and the circular wheel (911) in the eccentric crescent (913). The end covers (914) are rotatably connected to the housing (90).

3. A tower crane rope-breaking prevention device according to claim 2, characterized in that: The lifting capacity limiter (53), the first fixed pulley (301), the second fixed pulley (302), the third fixed pulley (303) and the fourth fixed pulley (304) are all provided with pin-type pressure sensors for detecting the pressure applied to each pulley, thereby determining the specific position of the fracture.

4. A tower crane anti-rope breaking device according to claim 3, characterized in that: The broken rope locker (9) is also provided with a hydraulic clamp for electrically clamping the lifting rope (2); when the pin-type pressure sensor detects a pressure change, the lifting rope (2) is clamped by the hydraulic clamp, thereby locking the lifting rope (2).

5. The tower crane rope-breaking prevention device according to claim 3, characterized in that: The broken rope locker (9) is also provided with guide wheels (92) at upper and lower positions of the lifting rope (2) for positioning the lifting rope (2) at the outer ring position of the circular wheel (911) for sliding.

6. A tower crane anti-rope breaking device according to claim 3, characterized in that: The outer side of the eccentric crescent (913) is also provided with a plurality of convex teeth (9131) arranged in a circumferential manner and protruding outwards.

7. A tower crane rope-breaking prevention device according to claim 1, characterized in that: A slide rail (11) is provided at the bottom of the lifting arm (1), and a sliding roller (31) and an anti-drop support plate (32) are provided at a position of the load-carrying trolley (3) corresponding to the position in the slide rail (11); the sliding roller (31) rolls in the slide rail (11), and the anti-drop support plate (32) slides in the slide rail (11).

8. The tower crane rope-breaking prevention device according to claim 1, characterized in that: The pulling cable device (51) comprises a driving motor (511) and a drum (512); the driving motor (511) and the rotating shaft of the drum (512) are arranged in a gear box (513) and are connected via gear meshing; the driving motor (511) drives the drum (512) to rotate, and the starting end of the lifting rope (2) is wound around the drum (512).

9. The tower crane rope-breaking prevention device according to claim 1, characterized in that: The front and rear positions of the load-carrying trolley (3) are respectively connected to a front traction rope and a rear traction rope, and a drum driven to rotate by a motor is arranged at one end close to the root of the lifting arm (1). The starting ends of the front traction rope and the rear traction rope are wound on the drum in different directions. The terminal end of the front traction rope is fixed to the front side of the load-carrying trolley (3), and the terminal end of the rear traction rope passes through a pulley arranged at the end of the lifting arm (1) away from the balance arm and is fixed to the rear side of the load-carrying trolley (3).

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