A rope descent control system

Abstract

The utility model relates to tower crane technical field especially relates to a kind of installation rope anti-falling system. Including anti-falling wire rope and anti-falling support, the both ends of anti-falling wire rope are respectively fixedly connected on two installation ropes by connecting piece and length is greater than the spacing between two installation ropes, so that when installation rope is straightly stressed, anti-falling wire rope is in stress-free state, anti-falling support includes support horizontal plate and support inclined rod and support horizontal plate and support inclined rod fixed connection, and anti-falling support is installed on hoist arm lower chord ear plate by pin shaft. To overcome the problem that installation rope needs to be repeatedly disassembled in prior art, it is easy to cause safety accident without removing, the utility model provides a kind of installation rope anti-falling system, the purpose is: 1. without removing installation rope during normal use of tower crane, the disassembly time of installation rope is greatly saved, and operation efficiency is improved;2. by anti-falling structure design, effectively prevent installation rope from falling, avoid its interference hoist arm's pitch action, guarantee tower crane operation safety.

Description

Technical Field

[0001] This utility model relates to the field of tower crane technology, and in particular to a rope fall prevention system. Background Technology

[0002] Before installing the luffing cable on a luffing tower crane, two installation ropes are typically used to connect the jib to the A-frame. After the installation ropes are fully tensioned, the truck crane is removed, the jib is aligned with the horizontal plane, and the luffing cable is then installed.

[0003] Installation ropes, as a key temporary load-bearing component in the assembly and disassembly of luffing jib tower cranes, are widely used due to their simple structure and convenient assembly and disassembly. However, they have the following shortcomings:

[0004] 1. Cumbersome operation and low work efficiency: After installation and commissioning, in order to ensure that the boom can pitch freely during normal operation, the two installation ropes must be removed from the A-frame and fixed to the platform at the base of the boom. When the tower crane is dismantled later, the installation ropes need to be reinstalled in their original positions. Repeated operation leads to increased manpower and time costs and low work efficiency.

[0005] 2. Safety hazards exist and normal operation is affected: If the installation rope is not removed in order to avoid repeated disassembly and assembly, the unsecured installation rope is easily caught on the crane boom structure during the boom's pitching motion. This will not only interfere with the normal use of the tower crane, but may also cause safety accidents such as equipment jamming and structural damage. Utility Model Content

[0006] To overcome the problems of existing technologies where installation ropes require repeated disassembly and reassembly, and where failure to remove them can easily lead to safety accidents, this utility model provides an installation rope fall prevention system. The purpose is to: 1. Eliminate the need to remove the installation rope during normal tower crane operation, significantly saving disassembly and reassembly time and improving work efficiency; 2. Effectively prevent the installation rope from falling through the fall prevention structure design, avoiding interference with the boom's pitching and tilting movements, and ensuring the safe operation of the tower crane.

[0007] The technical solution adopted in this utility model is as follows: a rope-mounted fall arrest system, comprising a fall arrest wire rope and a fall arrest bracket. The two ends of the fall arrest wire rope are respectively fixedly connected to two installation ropes by connectors, and the length is greater than the distance between the two installation ropes, so that when the installation ropes are taut and under load, the fall arrest wire rope is in a state of no load.

[0008] The fall arrestor includes a horizontal support plate and a diagonal support rod, and the horizontal support plate and the diagonal support rod are fixedly connected. The fall arrestor is installed on the lower chord ear plate of the crane arm by a pin.

[0009] As a further improvement of this utility model, the connecting member is a wire rope clamp.

[0010] As a further improvement of this utility model, the lower chord ear plate of the crane boom is provided with a plurality of pin holes that are adapted to the pin shaft.

[0011] As a further improvement of this utility model, three pin holes are provided on the lower chord ear plate of the crane boom.

[0012] As a further improvement of this utility model, the cross plate of the support has two parallel pin holes and is connected to the lower chord ear plate of the lifting arm through the two pins to prevent the anti-fall support from rotating around the pin axis.

[0013] As a further improvement of this utility model, the angle of inclination between the bracket and the horizontal plane is between 40° and 50°.

[0014] As a further improvement of this utility model, the support cross plate and the support diagonal rod are formed by welding.

[0015] The beneficial effects of this utility model are: (1) Level 1 anti-fall protection: During the boom luffing process, when the installation rope slackens and falls, the anti-fall wire rope will naturally hook onto the upper chord of the boom. Through the traction effect, the installation rope will shift towards the center of the boom, ensuring that the installation rope can fall smoothly onto the lower chord of the boom. This effectively avoids interference between the installation rope and the lower chord due to random drooping, ensuring a stable and smooth luffing process.

[0016] (2) Secondary fall protection: If the fall protection wire rope fails due to an accident, the installation rope can slowly slide along the inclined bar of the fall protection bracket to the top of the lower chord of the boom. The secondary fall protection is achieved through the guiding and supporting effect of the inclined bar. The dual protection design ensures that the installation rope does not need to be removed during the use of the tower crane, which fundamentally saves the disassembly and assembly time.

[0017] (3) Stable and durable structure: The anti-fall bracket is fixed by two parallel pin shafts, which can effectively prevent the bracket from rotating during the boom luffing process and avoid losing the anti-fall effect due to bracket displacement; at the same time, the diagonal bar is made of round steel, which can greatly reduce the wear between it and the installation rope, extend the service life of both parties, and the overall structure is simple and the manufacturing cost is low, making it easy to add and modify on existing tower cranes and highly practical.

[0018] (4) Easy to transport and highly integrated: The fall arrestor is connected to the ear plate by a pin. When the tower crane is being transported, it can be rotated 90° around the pin, changing it from the horizontal state during operation to the vertical storage state. This not only makes the overall structure meet the transportation size requirements and effectively avoids the risk of being too wide, but also realizes the integrated transport of the support and the boom, avoiding the separate disassembly and loss of parts. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a fall arresting wire rope for a rope-mounted fall arresting system according to this utility model;

[0020] Figure 2 This is a schematic diagram of a fall arrestor bracket for a rope fall arrestor system according to this utility model;

[0021] Figure 3 This is a schematic diagram of the installation of a fall arrestor bracket for a rope fall arrestor system according to this utility model.

[0022] As shown in the figure: 1. Installation rope; 2. Anti-fall wire rope; 3. Anti-fall bracket; 301. Bracket cross plate; 302. Bracket diagonal bar; 303. Pin shaft; 304. Lower chord ear plate of the lifting arm; 4. Wire rope clamp. Detailed Implementation

[0023] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0024] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0025] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] This utility model provides the following: Figure 1-3 The illustrated installation rope fall arrest system includes a fall arrest wire rope 2 and a fall arrest bracket 3. The two ends of the fall arrest wire rope 2 are respectively fixedly connected to two installation ropes 1 by connectors and the length is greater than the distance between the two installation ropes 1, so that when the installation ropes 1 are taut and under load, the fall arrest wire rope 2 is in a state of no load.

[0027] The fall arrestor 3 includes a support horizontal plate 301 and a support diagonal rod 302, and the support horizontal plate 301 and the support diagonal rod 302 are fixedly connected. The fall arrestor 3 is installed on the lower chord ear plate 304 of the crane arm through a pin 303.

[0028] In this utility model, the connecting component is a wire rope clamp 4. The end of the anti-fall wire rope 2 is tightly clamped and fixed to the installation rope 1. Its clamping force is uniform and detachable, which facilitates the flexible switching of the installation rope 1 in the load-bearing state and the non-load-bearing state. At the same time, it ensures that the anti-fall wire rope 2 can reliably play a traction role when the installation rope 1 is slack.

[0029] In this utility model, the lower chord ear plate 304 of the crane boom is provided with multiple pin holes that are compatible with the pin 303.

[0030] In this utility model, three pin holes are provided on the lower chord ear plate 304 of the crane boom.

[0031] In this utility model, the support horizontal plate 301 has two parallel pin holes and is connected to the lower chord ear plate 304 of the lifting arm through two pins 303 to prevent the fall arrestor 3 from rotating around the axis of the pins 303. The two pins 303 pass through the corresponding pin holes of the support horizontal plate 301 and the ear plate to form a double-support fixed structure. Its lateral stability is significantly better than that of a single pin connection, which can effectively resist the lateral impact force generated when the installation rope 1 slips, and ensure that the fall arrestor will not be angularly offset due to vibration or external force during long-term use.

[0032] In this utility model, the angle between the inclined rod 302 of the support and the horizontal plane is between 40° and 50°. This angle has been verified by mechanical analysis and actual working conditions. It can ensure the smooth sliding of the installation rope 1 along the surface of the inclined rod in the event of an accidental fall, reducing the risk of jamming during the sliding process. It can also decompose the supporting force of the inclined rod on the installation rope 1 into reasonable vertical and horizontal components, avoiding the installation rope 1 from bouncing or being damaged due to excessive impact force.

[0033] In this utility model, the support horizontal plate 301 and the support diagonal rod 302 are formed by welding. After welding, the weld is subjected to 100% penetration testing to ensure that there are no defects such as pores, cracks, or lack of fusion. After the welded parts are polished smooth, they are coated with anti-rust primer and topcoat, which improves the overall structural strength and corrosion resistance of the fall arrestor 3 and ensures its structural stability and durability during long-term use of the tower crane.

[0034] Working Principle: In practical implementation, when the tower crane is installed and enters normal working condition, the two installation ropes change from taut to slack. At this time, the anti-fall wire rope, which is longer than the distance between the installation ropes, naturally droops due to its own weight and reserved length, forming a first-level anti-fall protection. During the boom's pitching and luffing motion, once the installation ropes slack and fall, the anti-fall wire rope will first hook onto the upper chord of the boom. Through its connection point, it generates a centripetal lateral traction force on the two installation ropes, forcing the installation rope bundle to converge towards the center of the boom, thereby guiding it to fall safely onto the lower chord of the boom in a controlled trajectory. This effectively prevents the installation ropes from hooking or interfering with the lower chord, tie rods, or other moving parts due to disordered drooping. If this primary protection fails due to accidental impact or wire rope malfunction, secondary passive protection is activated: the installation rope continues to fall and contacts the inclined rod of the fall arrestor fixed to the lower chord's ear plate. This inclined rod, set at an optimal angle of 40°-50°, provides a smooth, sloping guide surface for the installation rope. The rope will slowly and controllably slide along this inclined surface to the area above the lower chord, rather than falling rapidly, thus eliminating the safety risks of structural collisions and jamming that could be caused by a sudden drop. Throughout the process, the fall arrestor, with its double pins on the horizontal plate and the multi-hole design of the ear plate, ensures absolute stability in its working posture, preventing protection failure due to support swaying or rotation. Ultimately, through this dual fall arrestor mechanism, the installation rope is safely and reliably restrained within the designated non-interference area throughout the entire working cycle of the tower crane, fundamentally eliminating the need for repeated disassembly and assembly and ensuring equipment operational safety.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rope-mounted fall arrest system, characterized in that: It includes a fall arresting wire rope (2) and a fall arresting bracket (3). The two ends of the fall arresting wire rope (2) are respectively fixedly connected to two installation ropes (1) by connectors and the length is greater than the distance between the two installation ropes (1), so that when the installation ropes (1) are taut and bearing force, the fall arresting wire rope (2) is in a state of no force. The fall arrestor (3) includes a support horizontal plate (301) and a support diagonal rod (302), and the support horizontal plate (301) and the support diagonal rod (302) are fixedly connected. The fall arrestor (3) is installed on the lower chord ear plate (304) of the crane arm through a pin (303).

2. The rope-mounted fall arrest system according to claim 1, characterized in that: The connector is a wire rope clamp (4).

3. The rope-mounted fall arrest system according to claim 1, characterized in that: The lower chord ear plate (304) of the crane arm is provided with a plurality of pin holes that are adapted to the pins (303).

4. The rope-mounted fall arrest system according to claim 3, characterized in that: The lower chord lug plate (304) of the crane boom has three pin holes.

5. The installation rope fall arrest system according to claim 1, characterized in that: The support cross plate (301) has two parallel pin holes and is connected to the lower chord ear plate (304) of the lifting arm through two pins (303) to prevent the fall arrestor (3) from rotating around the pin (303) axis.

6. The rope-mounted fall arrest system according to claim 1, characterized in that: The angle of inclination between the support diagonal rod (302) and the horizontal plane is between 40° and 50°.

7. The rope-mounted fall arrest system according to claim 1, characterized in that: The support cross plate (301) and the support diagonal rod (302) are formed by welding.

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