A crane arm turning method

Abstract

The present invention provides a boom flipping method, which includes the following steps: firstly, lifting the boom horizontally and lifting the boom away from a supporting surface; then, a third lifting device loosens a steel wire rope group; since the first lifting point and the second lifting point have the same horizontal height, the second side of the boom rotates relative to the first side, and the boom flips for the first time; then, the third lifting device is moved and connected to a fourth lifting point, thereby avoiding interference caused by the steel wire rope group being connected to the second side of the boom from above; after the moved third lifting device is connected to the fourth lifting point, the third lifting device tightens the steel wire rope group, drives the second side of the boom to continue rotating relative to the first side, and the boom flips again; by flipping the boom twice, the boom is flipped 180 degrees relative to the initial state, which facilitates welding processing at different positions of the boom.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting devices, and in particular to a method for turning over a lifting arm. Background Art

[0002] The lifting device is capable of vertically lifting and horizontally transporting heavy objects within a certain range. During installation or welding of the boom, the lifting device is used to hoist the boom and achieve its tilting. Patent document No. 202310715056.4 in China, published on July 18, 2023, discloses a lifting device for prefabricated bridge components, comprising a first lifting mechanism and a second lifting mechanism. The first lifting mechanism comprises a main boom and a main lifting rope. The second lifting mechanism comprises an auxiliary boom and two auxiliary lifting ropes. The auxiliary boom has a first state and a second state. When the auxiliary boom is in the first state, the first and second lifting mechanisms operate to position the prefabricated bridge component horizontally. When the auxiliary boom is in the second state, friction between the lifting lug and the first hook creates an angle between the prefabricated bridge component and the vertical line. The auxiliary boom is then swung, causing the prefabricated bridge component to become vertical.

[0003] The lifting device enables the bridge prefabricated parts to flip from a horizontal state to a vertical state, making the bridge flip 90 degrees, but cannot achieve a 180-degree flip of the bridge. Summary of the Invention

[0004] The invention provides a boom turning method, which can turn the boom 180 degrees.

[0005] To achieve the above object, the technical solution of the present invention is: a boom turning method, comprising the following steps:

[0006] S1. Set a first hanging point and a second hanging point on a first side of the boom, and set a third hanging point and a fourth hanging point on a second side of the boom; the first hanging point and the second hanging point have the same horizontal height, and the third hanging point and the fourth hanging point have different horizontal heights.

[0007] S2. The first lifting point is connected to the first lifting device through a wire rope group, the second lifting point is connected to the second lifting device through a wire rope group, and the third lifting point is connected to the third lifting device through a wire rope group; the first lifting device and the second lifting device are arranged on the first side of the boom, and the third lifting point is arranged on the second side of the boom.

[0008] S3, the first lifting device, the second lifting device and the third lifting device apply the same pulling force to the boom to lift the boom horizontally.

[0009] S4. When the boom rises to a preset height, proceed to S5.

[0010] S5. The third lifting device loosens the steel wire rope group, and the length of the steel wire rope group between the third lifting device and the third lifting point increases; the boom flips with the straight line between the first lifting point and the second lifting point as the axis.

[0011] S6. Release the connection between the third lifting point and the wire rope group.

[0012] S7. Move the third lifting device toward the first lifting device.

[0013] S8. The wire rope group connected to the third lifting device is connected from the fourth lifting point on the second side below the boom.

[0014] S9, the third lifting device tightens the wire rope group, and the length of the wire rope group between the third lifting device and the fourth lifting point is shortened; the boom is flipped with the straight line where the first lifting point and the second lifting point are located as the axis, and the boom is flipped 180° relative to the initial state.

[0015] The above method first lifts the boom horizontally and lifts the boom away from the supporting surface. Then, the third lifting device loosens the wire rope group. Since the first lifting point and the second lifting point are at the same horizontal height, the second side of the boom rotates relative to the first side, and the boom flips for the first time. Then, the third lifting device is moved and connected to the fourth lifting point. This avoids interference caused by the wire rope group connected to the second side of the boom from above. After the moved third lifting device is connected to the fourth lifting point, the third lifting device tightens the wire rope group, drives the second side of the boom to continue rotating relative to the first side, and the boom flips again. By flipping the boom twice, the boom is flipped 180° relative to the initial state, which is convenient for welding processing at different positions of the boom.

[0016] Furthermore, the wire rope group includes a first wire rope, a second wire rope and a third wire rope, one end of the second wire rope is detachably connected to the first wire rope, the other end of the second wire rope is detachably connected to the third wire rope after passing around the first lifting point, the second lifting point, the third lifting point or the fourth lifting point, the second wire rope is slidably connected to the first lifting point, the second lifting point, the third lifting point or the fourth lifting point, and the first wire rope and the third wire rope are both connected to the first lifting device, the second lifting device or the third lifting device.

[0017] According to the above method, the second steel wire rope is detachably connected to the first steel wire rope and the third steel wire rope, which facilitates the separation of the second steel wire rope from the boom. At the same time, when the second steel wire rope is separated from one hanging point of the boom, the second steel wire rope can be quickly connected to another hanging point of the boom; at the same time, the second steel wire rope is slidably connected to the first hanging point, the second hanging point, the third hanging point or the fourth hanging point, so that the friction between the second steel wire rope and the first hanging point, between the second steel wire rope and the second hanging point, between the second steel wire rope and the third hanging point, and between the second steel wire rope and the fourth hanging point is small, which facilitates the turning over of the boom.

[0018] Furthermore, the second steel wire rope is connected to the first steel wire rope, and the second steel wire rope is connected to the third steel wire rope via shackles.

[0019] Furthermore, the first hanging point, the second hanging point and the third hanging point are all cylindrical brackets on the boom. This way, the friction is small.

[0020] Furthermore, pads are provided at the connection points between the second steel wire rope and the first suspension point, the second suspension point, the third suspension point and the fourth suspension point. By providing the pads, the wear of the second steel wire rope on the boom is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the present invention connected to the boom.

[0022] Figure 2 Schematic diagram of the horizontal rise of the boom.

[0023] Figure 3 Schematic diagram of the first flip of the boom.

[0024] Figure 4 Schematic diagram of the second flip of the boom.

[0025] Figure 5 This is a schematic diagram of the crane after it is flipped 180° relative to its initial state.

[0026] Figure 6 Flowchart of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-6 As shown, a method for turning over a boom 1 comprises the following steps:

[0029] S1. A first hanging point 11 and a second hanging point 12 are set on a first side of the boom 1, and a third hanging point 13 and a fourth hanging point 14 are set on a second side of the boom 1; the first hanging point 11 and the second hanging point 12 are at the same height, while the third hanging point 13 and the fourth hanging point 14 are at different heights. In this embodiment, the first hanging point 11 and the second hanging point 12 are set at the top of the first side, the third hanging point 13 is set at the top of the second side, and the fourth hanging point 14 is set at the bottom of the second side.

[0030] S2, first lifting point 11 is connected to first lifting device 3 via wire rope group 2, second lifting point 12 is connected to second lifting device 4 via wire rope group 2, and third lifting point 13 is connected to third lifting device 5 via wire rope group 2. First and second lifting devices 3 and 4 are located on the first side of boom 1, and third lifting point 13 is located on the second side of boom 1. In this real-time exchange rate, first, second, and third lifting devices 3, 4, and 5 are all cranes equipped with hooks.

[0031] S3, the first lifting device 3, the second lifting device 4 and the third lifting device 5 apply the same pulling force to the boom 1 to lift the boom 1 horizontally.

[0032] S4. When the boom 1 rises to a preset height, proceed to S5.

[0033] S5, the third lifting device 5 loosens the wire rope group 2, and the length of the wire rope group 2 between the third lifting device 5 and the third lifting point 13 increases; the boom 1 flips with the straight line between the first lifting point 11 and the second lifting point 12 as the axis.

[0034] S6. Release the connection between the third suspension point 13 and the steel wire rope group 2.

[0035] S7 . Move the third lifting device 5 toward the first lifting device 3 .

[0036] S8. The steel wire rope group 2 connected to the third lifting device 5 is connected from the fourth lifting point 14 on the second side below the boom 1.

[0037] S9, the third lifting device 5 tightens the wire rope group 2, and the length of the wire rope group 2 between the third lifting device 5 and the fourth lifting point 14 is shortened; the boom 1 is flipped with the straight line where the first lifting point 11 and the second lifting point 12 are located as the axis, and the boom 1 is flipped 180° relative to the initial state.

[0038] In the above method, the boom 1 is first lifted horizontally and lifted off the supporting surface. Then, the third lifting device 5 loosens the wire rope group 2. Since the first lifting point 11 and the second lifting point 12 are at the same horizontal height, the second side of the boom 1 rotates relative to the first side, and the boom 1 flips for the first time. Then, the third lifting device 5 is moved and connected to the fourth lifting point 14. This avoids interference caused by the wire rope group 2 connecting to the second side of the boom 1 from above the boom 1. After the moved third lifting device 5 is connected to the fourth lifting point 14, the third lifting device 5 tightens the wire rope group, drives the second side of the boom 1 to continue to rotate relative to the first side, and the boom 1 flips again. By flipping the boom 1 twice, the boom 1 is flipped 180° relative to the initial state, which is convenient for welding processing at different positions of the boom 1.

[0039] The wire rope group 2 includes a first wire rope 21, a second wire rope 22 and a third wire rope 23. One end of the second wire rope 22 is detachably connected to the first wire rope 21, and the other end of the second wire rope 22 is detachably connected to the third wire rope 23 after passing around the first lifting point 11, the second lifting point 12, the third lifting point 13 or the fourth lifting point 14. The second wire rope 22 is slidably connected to the first lifting point 11, the second lifting point 12, the third lifting point 13 or the fourth lifting point 14. The first wire rope 21 and the third wire rope 23 are both connected to the first lifting device 3, the second lifting device 4 or the third lifting device 5. The second steel wire rope 22 is detachably connected to the first steel wire rope 21 and the third steel wire rope 23, which facilitates the separation of the second steel wire rope 22 from the boom 1. At the same time, when the second steel wire rope 22 is separated from one hanging point of the boom 1, the second steel wire rope 22 can be quickly connected to another hanging point of the boom 1; at the same time, the second steel wire rope 22 is slidably connected to the first hanging point 11, the second hanging point 12, the third hanging point 13 or the fourth hanging point 14, so that the friction between the second steel wire rope 22 and the first hanging point 11, the second steel wire rope 22 and the second hanging point 12, the second steel wire rope 22 and the third hanging point 13, and the second steel wire rope 22 and the fourth hanging point 14 is small, which facilitates the turning over of the boom 1.

[0040] In this embodiment, the first, second, and third suspension points 11, 12, and 13 are all cylindrical supports on the boom 1. This reduces friction. The second steel rope 22 is connected to the first steel rope 21, and the second steel rope 22 is connected to the third steel rope 23 via shackles 24. This simplifies the structure.

[0041] Furthermore, pads are provided at the connection points between the second steel wire rope 22 and the first suspension point 11, the second suspension point 12, the third suspension point 13 and the fourth suspension point 14. By providing the pads, the wear of the second steel wire rope 22 on the boom 1 is reduced.

Claims

1. A boom turning method, characterized in that: The following steps are involved: S1. Setting a first hanging point and a second hanging point on a first side of the boom, and setting a third hanging point and a fourth hanging point on a second side of the boom; the first hanging point and the second hanging point have the same horizontal height, and the third hanging point and the fourth hanging point have different horizontal heights; S2, the first lifting point is connected to the first lifting device via a wire rope group, the second lifting point is connected to the second lifting device via a wire rope group, and the third lifting point is connected to the third lifting device via a wire rope group; the first lifting device and the second lifting device are arranged on a first side of the boom, and the third lifting point is arranged on a second side of the boom; S3, the first lifting device, the second lifting device and the third lifting device apply the same pulling force to the boom to lift the boom horizontally; S4, when the boom rises to the preset height, proceed to S5; S5: The third lifting device releases the steel wire rope group, and the length of the steel wire rope group between the third lifting device and the third lifting point increases; the boom flips with the straight line between the first and second lifting points as the axis; S6. Release the connection between the third lifting point and the wire rope group; S7, moving the third lifting device toward the first lifting device; S8, the wire rope group connected to the third lifting device is connected from the fourth lifting point on the second side below the boom; S9, the third lifting device tightens the wire rope group, and the length of the wire rope group between the third lifting device and the fourth lifting point is shortened; the boom is flipped with the straight line where the first lifting point and the second lifting point are located as the axis, and the boom is flipped 180° relative to the initial state.

2. A boom turning method according to claim 1, characterized in that: The wire rope group includes a first wire rope, a second wire rope and a third wire rope, one end of the second wire rope is detachably connected to the first wire rope, the other end of the second wire rope is detachably connected to the third wire rope after passing around the first lifting point, the second lifting point, the third lifting point or the fourth lifting point, the second wire rope is slidably connected to the first lifting point, the second lifting point, the third lifting point or the fourth lifting point, and the first wire rope and the third wire rope are both connected to the first lifting device, the second lifting device or the third lifting device.

3. A boom turning method according to claim 2, characterized in that: The second steel wire rope is connected to the first steel wire rope, and the second steel wire rope is connected to the third steel wire rope via shackles.

4. A boom turning method according to claim 2, characterized in that: The first hanging point, the second hanging point and the third hanging point are all cylindrical supports on the boom.

5. The boom turning method according to claim 1, characterized in that: Pads are provided at sliding connections between the second steel wire rope and the first hanging point, the second hanging point, the third hanging point and the fourth hanging point.

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