A rope system for changing amplitude

Abstract

The application provides a rope system for changing amplitude, which comprises a steel wire rope, two amplitude-changing winches, two amplitude-changing pulley blocks and a steel wire rope connecting device, the steel wire rope connecting device is arranged between the two amplitude-changing pulley blocks, the amplitude-changing winch is arranged on a rotary platform, the amplitude-changing pulley block comprises a first amplitude-changing pulley frame and a second amplitude-changing pulley frame, the first amplitude-changing pulley frame is arranged at the head of a lifting arm, the second amplitude-changing pulley frame is arranged on a tripod, one end of the steel wire rope is connected to the amplitude-changing winch, and the other end of the steel wire rope is fixedly connected to the steel wire rope connecting device through the amplitude-changing pulley frame. The application can change the range of amplitude, and can reduce the influence on the structure of the lifting arm.

Description

Technical Field

[0001] This invention relates to the field of crane wire rope technology, and more specifically to a rope system for changing amplitude. Background Technology

[0002] With the development of social industry, the luffing methods of cranes mainly include hydraulic cylinder luffing and wire rope luffing. This also includes controlling the luffing wire rope's extension and retraction by varying the amplitude of the boom crane. Traditional rope-type cables are flexible, single-strand wire ropes. If any part of the traditional rope is damaged, the entire cable must be scrapped. These systems are prone to corrosion, difficult to maintain, require cumbersome inspection, and have a short service life. To overcome these technical problems, a patent document with Chinese patent application number 201922099345.8 and publication date of July 28, 2020, discloses a rigid luffing cable system for a boom crane, belonging to the field of lifting machinery technology. The rigid luffing cable system includes a luffing pulley block located directly above the middle of the boom, a segmented rigid luffing cable hinged between the luffing pulley block and the boom head, and a luffing wire rope wound between the luffing pulley block and the luffing winch and reversed by a steering pulley. The segmented rigid luffing cable is a chain-like structure composed of several sections of tension plates connected end to end by double-hole double-chain plates and pin shafts.

[0003] This paper uses segmented spliced ​​rigid luffing cables to replace the rope cables in the traditional luffing system, which makes the performance stable and easy to inspect and maintain. However, this structure changes the amplitude by winding and unwinding the wire rope with a single luffing winch to change the boom's elevation angle. This process inevitably has a certain impact on the boom's structure. At the same time, the luffing range is limited by using only a single luffing winch and cannot meet the needs of a wide range of luffing. Summary of the Invention

[0004] The purpose of this invention is to provide a rope system for changing the amplitude, which has a large range of amplitude changes and can reduce the impact on the crane boom structure.

[0005] To achieve the above objectives, a rope system for changing amplitude includes two wire ropes, two luffing winches, two luffing pulley blocks, and a wire rope connecting device. The wire rope connecting device is disposed between the two luffing pulley blocks. The luffing winches are disposed on a slewing platform. Each luffing pulley block includes a first luffing pulley frame and a second luffing pulley frame. The first luffing pulley frame is disposed at the head of the boom, and the second luffing pulley frame is disposed on a tripod. The first luffing pulley frame includes two or more first pulleys and second pulleys, and the second luffing pulley frame includes a third pulley. One end of one wire rope is connected to one luffing winch, and the other end of the wire rope exits, passes over the first and third pulleys, and then passes through the second pulley to be fixedly connected to one end of the wire rope connecting device. One end of another wire rope is connected to another luffing winch, and the other end of the other wire rope exits, passes over the first and third pulleys, and then passes through the second pulley to be fixedly connected to the other end of the wire rope connecting device.

[0006] The above setup, by placing the luffing winch on the slewing platform and connecting one end of the wire rope to the winch, allows the wire rope to have different luffing amplitudes through the output of the winch. Furthermore, by fixing the other end of the wire rope to a wire rope connecting device, the wire ropes of two different luffing winches can be routed around the luffing pulley block and fixedly connected to the wire rope connecting device. This allows the different wire ropes to be connected as a whole through the wire rope connecting device, ensuring that the force in the wire ropes with different luffing amplitudes is the same. This results in better stability when the wire ropes with different luffing amplitudes are wound around the luffing pulley block and connected by the wire rope connecting device.

[0007] Furthermore, the first luffing pulley frame and the second luffing pulley frame are arranged relatively parallel to each other.

[0008] The above settings facilitate the winding of the wire rope.

[0009] Furthermore, the first pulleys are arranged horizontally side by side, and the second pulley is arranged below the first pulleys and perpendicular to the first pulleys.

[0010] The above configuration allows the wire rope to first pass over the first pulley in the first luffing pulley frame, then through the second luffing pulley frame, and finally be fixedly engaged with the wire rope connecting device through the second pulley in the first luffing pulley frame.

[0011] Furthermore, the wire rope connecting device includes two wedge-shaped joints and two connecting pieces. The two wedge-shaped joints are located on the same horizontal axis and are arranged opposite to each other. The two wedge-shaped joints are respectively engaged with the two ends of the connecting pieces.

[0012] The above settings facilitate the connection of two oppositely positioned wedge joints using connectors.

[0013] Furthermore, one end of the wedge-shaped connector is wedge-shaped, and the other end of the wedge-shaped connector has two protrusions. The two protrusions are arranged in parallel and opposite directions on both sides of the other end of the wedge-shaped connector. The protrusions include a gasket and a locking protrusion. One end of the locking protrusion is fixedly connected to the gasket, and the other end of the locking protrusion extends outward.

[0014] The above settings allow one end of the wire rope to pass through the wedge joint and then be knotted, preventing the wire rope from slipping off the wedge joint and facilitating the engagement of the wedge joint with the connector.

[0015] Furthermore, the connector has slots at both ends that match the protrusions, and the slots are fitted onto the protrusions to achieve a snap-fit ​​connection.

[0016] The above configuration allows the connector to be snapped onto the two wedge joints via a bayonet, thus connecting the two wedge joints into one unit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the steel wire rope connection device in this invention.

[0019] Figure 3 This is a cross-sectional view of the wire rope connection device in this invention. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 3As shown, a luffing wire rope device includes a wire rope, two luffing winches 1, two luffing pulley blocks, and a wire rope connecting device 2. The wire rope connecting device 2 is disposed between the two luffing pulley blocks. In this embodiment, proximity switches (not shown in the figure) are provided on both sides of the wire rope connecting device 2, and the proximity switches are disposed between the luffing pulley blocks and the wire rope connecting device 2. This allows the proximity switches to limit the left and right horizontal movement of the wire rope connecting device 2, preventing the wire rope from moving unidirectionally to the left or right after being connected by the wire rope connecting device 2 due to different outputs of different luffing winches, thus preventing the wire rope from deviating to one side and causing uneven luffing. The luffing winches 1 are fixedly mounted on a rotating platform (not shown in the figure). The luffing pulley blocks include a first luffing pulley frame 31 and a second luffing pulley frame 32. The first luffing pulley frame 31 is fixedly mounted on the head of the boom (not shown in the figure), and the second luffing pulley frame 32 is fixedly mounted on the tripod (not shown in the figure). The first luffing pulley frame 31 and the second luffing pulley frame 32 are arranged relatively parallel to each other, which facilitates the subsequent winding of the wire rope. The first luffing pulley frame 31 includes a first pulley and a second pulley 312. In this embodiment, there are 6 first pulleys 311 arranged horizontally and coaxially side by side, and 1 second pulley 312 is provided, located at the bottom of the first pulley 311. At the same time, the second pulley 312 is arranged perpendicular to the first pulley 311, which facilitates the wire rope to be connected to one end of the wire rope connecting device 2 after passing around the second luffing pulley frame 32. In this embodiment, the second luffing pulley frame 32 includes a third pulley 321, and there are 6 third pulleys 321 arranged horizontally and coaxially side by side.

[0022] In this embodiment, the wire rope connecting device 2 includes two wedge-shaped joints 21 and two connecting pieces 22. The two wedge-shaped joints 21 are arranged opposite each other and are on the same horizontal axis. One end of each wedge-shaped joint 21 is wedge-shaped, and the other end of each wedge-shaped joint 21 has two protrusions 211. In this embodiment, the interior of each wedge-shaped joint 21 is hollow, which facilitates the wire rope to pass through the wedge-shaped joint 21 and to tie the wire rope in a knot, thus preventing the wire rope from slipping off the wedge-shaped joint 21. The two protrusions 211 are arranged parallel to each other on both sides of the other end of the wedge-shaped joint 21. In this embodiment, two protrusions 211 are coaxially arranged. Each protrusion 211 includes a gasket 4 and a locking protrusion 5. The gasket 4 is fixed to the outside of the other end of the wedge-shaped connector 21. One end of the locking protrusion 5 is fixedly connected to the gasket 4, and the other end of the locking protrusion 5 extends outward and is perpendicular to the gasket 4. Both ends of the connector 22 are provided with locking slots 221 that match the locking protrusion 5. The locking slots 221 are sleeved on the locking protrusion 5 to achieve locking. This makes it easy for the connector 22 to be locked onto the two wedge-shaped connectors 21 through the locking slots 221, thereby locking the two wedge-shaped connectors 21 onto the two ends of the connector 22 to form an integral unit.

[0023] In this embodiment, two wire ropes are provided. One end of a wire rope 6 is connected to and wound around a luffing winch, and the other end of the wire rope 6 passes around the luffing pulley frame and finally passes through the second pulley 312 to be snapped into one end of the wire rope connecting device 2. One end of the other wire rope 7 is connected to and wound around another luffing winch, and the other end of the other wire rope 7 passes around the luffing pulley frame and finally passes through the second pulley 312 to be snapped into the other end of the wire rope connecting device 2. The wire rope 6 is connected to the other wire rope 7 through the wire rope connecting device 2 to form a whole.

[0024] The working principle of this invention is as follows: Two wedge-shaped joints 21 are snapped together by connectors 22 to form an integral wire rope connecting device 2. Then, one end of a wire rope 6 is connected and wound around a luffing winch, and the other end of the wire rope 6 passes around the luffing pulley frame and is snapped together with one end of the wire rope connecting device 2. One end of another wire rope 7 is connected and wound around another luffing winch, and the other end of the other wire rope 7 passes around the luffing pulley frame and is snapped together with the other end of the wire rope connecting device 2. This makes the force in the two wire ropes with different luffing amplitudes the same, and makes the stability of the two wire ropes with different luffing amplitudes connected together by the wire rope connecting device 2 after winding around the luffing pulley group better. At the same time, proximity switches (not shown in the figure) are set on both sides of the wire rope connecting device 2 to prevent the wire rope from moving to the left or right in one direction and causing the wire rope to be biased to one side, resulting in uneven luffing of the wire rope.

Claims

1. A rope system for changing amplitude, comprising two wire ropes, two luffing winches, two luffing pulley blocks, and a wire rope connecting device, characterized in that: The wire rope connecting device is disposed between the two luffing pulley blocks. The wire rope connecting device includes two wedge-shaped joints and two connecting parts. The two wedge-shaped joints are on the same horizontal axis and are arranged opposite each other. The two wedge-shaped joints are respectively engaged with both ends of the connecting parts. One end of the wedge-shaped joint is wedge-shaped, and the other end of the wedge-shaped joint has two protrusions. The two protrusions are arranged parallel to each other on both sides of the other end of the wedge-shaped joint. The protrusions include a gasket and a locking protrusion. One end of the locking protrusion is fixedly connected to the gasket, and the other end of the locking protrusion extends outward. Both ends of the connecting parts have locking slots that match the locking protrusions. The locking slots are sleeved on the locking protrusions to achieve engagement. The luffing winch is mounted on a slewing platform. The luffing pulley block includes a first luffing pulley frame and a second luffing pulley frame. The first luffing pulley frame is mounted at the head of the boom, and the second luffing pulley frame is mounted on a tripod. The first luffing pulley frame includes two or more first pulleys and a second pulley. The second luffing pulley frame includes a third pulley. One end of a wire rope is connected to a luffing winch. The other end of the wire rope exits, passes over the first and third pulleys, and then passes through the second pulley to be fixedly connected to one end of a wire rope connecting device. One end of another wire rope is connected to another luffing winch. The other end of the other wire rope exits, passes over the first and third pulleys, and then passes through the second pulley to be fixedly connected to the other end of a wire rope connecting device.

2. The rope system for changing amplitude according to claim 1, characterized in that: The first variable amplitude pulley frame and the second variable amplitude pulley frame are arranged relatively parallel to each other.

3. A rope system for changing amplitude according to claim 2, characterized in that: The first pulleys are arranged horizontally side by side, and the second pulley is arranged below the first pulleys and perpendicular to the first pulleys.

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