A heavy crane A-frame installation method

Abstract

The present invention relates to the field of shipbuilding technology, and in particular to a method for installing an A-frame for a heavy crane. First, the A-frame is assembled on the ground or on a deck, the upper ends of a first support frame and a second support frame are hinged, and a temporary support structure is connected to the middle of the first support frame and the middle of the second support frame; then, the hook of the crane is connected to the hinge axis of the first support frame and the second support frame, and the A-frame is lifted above the slewing chassis by the crane; then, the position of the A-frame is moved by the crane, and the lower end of one of the first support frame and the second support frame is connected to the slewing chassis; finally, the temporary support structure is removed, and the lower end of the other of the first support frame and the second support frame is connected to the slewing chassis. Therefore, the heavy crane A-frame installation method of the present invention can realize the installation of the A-frame with a single crane, reducing the investment in crane resources and the skill level requirements for crane operators.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a method for installing an A-frame of a heavy crane. Background Art

[0002] A-frame crane is a relatively special lifting machinery. Different from general slewing cranes, it is a lifting machinery that rotates and tilts on a vertical plane. It has the characteristics of large lifting capacity and wide adaptability. It is widely used in various ocean survey ships, scientific research ships and engineering operation ships. It is the main supporting equipment of such ships.

[0003] The A-frame is the supporting body of the A-frame crane. The A-frame includes a first support frame and a second support frame. The upper ends of the first support frame and the second support frame are hinged, and the lower ends of the first support frame and the second support frame extend downward and away from each other and are connected to the slewing chassis with a pin shaft. At present, when installing the A-frame, it is necessary to first assemble the first support frame and the second support frame on the ground, so that the upper end of the first support frame and the upper end of the second support frame are hinged on the top crossbeam, and the first support frame and the second support frame maintain the freedom of rotation, so as to facilitate adjusting the angle of the first support frame and the second support frame when the A-frame is connected to the revolving chassis; after the assembly is completed, two cranes are used to lift the A-frame, one of which lifts the crossbeam and the other lifts the middle of the first support frame or the second support frame. During the lifting process, the horizontal distance and vertical distance between the hooks of the two cranes are synchronously controlled to ensure that a certain angle is maintained between the first support frame and the second support frame to avoid collision between the first support frame and the second support frame; after the first support frame and the second support frame are lifted to the top of the revolving chassis, the two cranes are moved horizontally and up and down to match the lower end of the first support frame with the position of the first connecting structure on the revolving chassis, and the lower end of the second support frame with the position of the second connecting structure on the revolving chassis. During the process of lifting the A-frame, two cranes need to be operated synchronously, which requires a large investment in crane resources and a high level of skill for the crane operators. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: currently, when installing an A-frame, two cranes need to be operated synchronously, which requires a large investment in crane resources and a high level of skill for crane operators.

[0005] In order to solve the above technical problems, the present invention provides a heavy crane A-frame installation method, comprising the following steps:

[0006] Step S1: Assemble an A-frame on the ground or on a deck, hinge the upper ends of a first support frame and a second support frame, and connect a temporary support structure at the middle of the first support frame and the middle of the second support frame so that the angle between the first support frame and the second support frame remains fixed;

[0007] Step S2: Connecting a hook of a crane to the hinge shaft of the first support frame and the second support frame, and using the crane to lift the A-frame above the slewing chassis;

[0008] Step S3: using the crane to move the A-frame, and connecting the lower end of one of the first support frame and the second support frame to the slewing chassis;

[0009] Step S4: dismantle the temporary support structure, adjust the angle between the first support frame and the second support frame, and connect the lower end of the other one of the first support frame and the second support frame to the rotary chassis.

[0010] As a preferred solution, in step S1, connecting the temporary support structure at the middle of the first support frame and the middle of the second support frame includes:

[0011] Connect the hook to the middle of the first support frame or the middle of the second support frame, lift the first support frame or the second support frame to increase the angle between the first support frame and the second support frame; then connect one end of the temporary support structure to the middle of the first support frame and the other end of the temporary support structure to the middle of the second support frame; thereafter remove the hook from the middle of the first support frame or the middle of the second support frame.

[0012] As a preferred solution, a second connecting eye plate is fixed to the upper end of the rotary chassis, and a first connecting eye plate is fixed to the lower end of the first support frame. In step S3, the lower end of the first support frame is connected to the rotary chassis 200, including:

[0013] A first pulling mechanism is connected to the left side of the first support frame for pulling the first support frame to swing to the left, and a second pulling mechanism is connected to the right side of the first support frame for pulling the first support frame to swing to the right. The first pulling mechanism and the second pulling mechanism are used to adjust the position of the first connecting eye plate in the left and right directions to match the second connecting eye plate.

[0014] As a preferred solution, in step S3, connecting the lower end of the first support frame to the rotary chassis includes:

[0015] The first support frame is moved downward by the crane so that the connection hole of the first connection eye plate is lower than the connection hole of the second connection eye plate; a vertically arranged telescopic drive device is provided on the rotary chassis, and the upper end of the telescopic drive device pushes the first support frame to rise or fall, so as to adjust the position of the first connection eye plate in the up and down direction to match the second connection eye plate.

[0016] As a preferred embodiment, the first pulling mechanism includes a first electric hoist connected to the left side of the slewing chassis and a first pull rope connected to the first electric hoist, and an end of the first pull rope away from the first electric hoist is connected to the left side of the first support frame;

[0017] The second pulling mechanism includes a second electric hoist connected to the right side of the rotary chassis and a second pull rope connected to the second electric hoist, and one end of the second pull rope away from the second electric hoist is connected to the right side of the first support frame.

[0018] As a preferred solution, the first support frame includes a first support column, a second support column and a first connecting beam which are spaced apart in a front-to-back manner, the first support column and the second support column are spaced apart in a front-to-back manner, one end of the first connecting beam is fixedly connected to the middle part of the first support column, and the other end of the first connecting beam is fixedly connected to the middle part of the second support column; the upper end of the first support column and the upper end of the second support column are both hinged to the upper end of the second support frame, and the lower end of the first support column and the lower end of the second support column are both fixedly connected to the first connecting eye plate.

[0019] As a preferred solution, two second connection eye plates spaced apart in front and back are fixed to the upper end of the rotary chassis. In step S1, the upper ends of the first support frame and the second support frame are hinged, including:

[0020] First, assemble the second support frame, then hinge the upper end of the first support column and the upper end of the second support column to the upper end of the second support frame, and then adjust the distance between the lower end of the first support column and the lower end of the second support column so that the distance between the two first connecting eye plates matches the distance between the two second connecting eye plates.

[0021] As a preferred solution, the temporary support structure is a column, one end of the column is welded to the middle of the first support frame, and the other end of the column is welded to the middle of the second support frame.

[0022] As a preferred solution, in step S4, dismantling the temporary support structure includes: cutting off the column.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The heavy crane A-frame installation method of the present invention first assembles the A-frame on the ground or deck, hinges the upper ends of the first support frame and the second support frame, connects a temporary support structure at the middle of the first support frame and the middle of the second support frame, so that the angle between the first support frame and the second support frame remains fixed; avoids collision between the first support frame and the second support frame when a single crane is used for lifting, connects the crane hook to the hinge axis of the first support frame and the second support frame, and uses the crane to lift the A-frame above the slewing chassis; then uses the crane to move the position of the A-frame, and connects the lower end of one of the first support frame and the second support frame to the slewing chassis; finally, removes the temporary support structure, and then can adjust the angle between the first support frame and the second support frame, and connects the lower end of the other of the first support frame and the second support frame to the slewing chassis. Therefore, the heavy crane A-frame installation method of the present invention can realize the installation of the A-frame with a single crane, reducing the crane resource investment and the skill level requirements for the crane operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Side view of the A-frame during installation of temporary support structures;

[0026] Figure 2 This is a top view of the A-frame after installation;

[0027] Figure 3 It is a schematic diagram of the process of righting the A-frame;

[0028] Figure 4 This is a schematic diagram of the completion of the A-frame righting;

[0029] Figure 5 A schematic diagram of connecting the first support frame to the rotary chassis;

[0030] Figure 6 A schematic diagram of connecting the second support frame to the rotary chassis;

[0031] Figure 7 for Figure 4 Schematic diagram of the middle A direction;

[0032] Figure 8 for Figure 4 Schematic diagram of the middle B direction;

[0033] In the figure, 100, A-frame; 200, slewing chassis; 1, first support frame; 11, first support column; 12, second support column; 13, first connecting beam; 2, second support frame; 3, temporary support structure; 4, crossbeam. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0036] like Figures 1 to 8 As shown, a preferred embodiment of the heavy crane A-frame installation method of the present invention includes the following steps:

[0037] Step S1: Assemble the A-frame 100 on the ground or on the deck, hinge the upper ends of the first support frame 1 and the second support frame 2, and connect a temporary support structure 3 to the middle of the first support frame 1 and the middle of the second support frame 2, so that the angle between the first support frame 1 and the second support frame 2 remains fixed; the provision of the temporary support structure 3 enables the first support frame 1 and the second support frame 2 to remain relatively fixed, so that the overall structure of the A-frame 100 is stable, and avoids collision between the first support frame and the second support frame when using a single crane to straighten the A-frame and hoist the A-frame;

[0038] Step S2: Connect the hook of the crane to the hinge axis of the first support frame 1 and the second support frame 2, and use the crane to lift the A-frame 100 above the slewing chassis 200; during the lifting process, the A-frame is in a free hanging state;

[0039] Step S3: Use a crane to move the A-frame 100 and connect the lower end of one of the first support frame 1 and the second support frame 2 to the rotary chassis 200;

[0040] Step S4, remove the temporary support structure 3, adjust the angle between the first support frame 1 and the second support frame 2, and connect the lower end of the other one of the first support frame 1 and the second support frame 2 to the rotary chassis 200; after removing the temporary support structure 3, the first support frame 1 and the second support frame 2 can rotate with each other, and then the angle between the first support frame and the second support frame can be adjusted. Therefore, the heavy crane A-frame installation method of the present invention can realize the installation of the A-frame with a single crane, reducing the crane resource investment and the skill level requirements for the crane operator.

[0041] Among them, in step S1, if Figure 1 As shown, a temporary support structure 3 is connected to the middle of the first support frame 1 and the middle of the second support frame 2, including:

[0042] Connect the hook to the middle of the first support frame 1 or the middle of the second support frame 2, lift the first support frame 1 or the second support frame 2 to increase the angle between the first support frame 1 and the second support frame 2; then connect one end of the temporary support structure 3 to the middle of the first support frame 1, and the other end of the temporary support structure 3 to the middle of the second support frame 2; thereafter remove the hook from the middle of the first support frame 1 or the middle of the second support frame 2.

[0043] In this embodiment, the upper end of the rotary chassis 200 is fixed with a second connection eye plate, and the lower end of the first support frame 1 is fixed with a first connection eye plate. In step S3, the lower end of the first support frame 1 is connected to the rotary chassis 200, including:

[0044] A first pulling mechanism is connected to the left side of the first support frame 1 for pulling the first support frame 1 to swing leftward, and a second pulling mechanism is connected to the right side of the first support frame 1 for pulling the first support frame 1 to swing rightward. The first and second pulling mechanisms are used to adjust the left-right position of the first connecting eye plate to match the second connecting eye plate. The first and second pulling mechanisms can be used to fine-tune the first support frame leftward or rightward, thereby adjusting the left-right position of the first connecting eye plate to match the second connecting eye plate.

[0045] In step S3, the lower end of the first support frame 1 is connected to the rotary chassis 200, including:

[0046] The first support frame 1 is moved downward by a crane so that the connection hole of the first connection eye plate is lower than the connection hole of the second connection eye plate; a vertically arranged telescopic drive device is provided on the rotary chassis 200, and the upper end of the telescopic drive device pushes the first support frame 1 to rise or fall, so as to adjust the position of the first connection eye plate in the vertical direction to match the second connection eye plate. Specifically, the A-frame is first moved downward by a crane so that the connection hole of the first connection eye plate moves downward and moves excessively below the connection hole of the second connection eye plate; then the telescopic drive device is used to push the first support frame upward, and the height of the first support frame can be fine-tuned upward, so that the connection hole of the first connection eye plate and the connection hole of the second connection eye plate are coaxial. There is no need to align the connection hole of the first connection eye plate and the connection hole of the second connection eye plate by a crane, which greatly reduces the skill requirements for the crane operator and speeds up the installation.

[0047] Specifically, the first pulling mechanism includes a first electric hoist connected to the left side of the slewing chassis 200 and a first pull rope connected to the first electric hoist, with the end of the first pull rope away from the first electric hoist connected to the left side of the first support frame 1. The second pulling mechanism includes a second electric hoist connected to the right side of the slewing chassis 200 and a second pull rope connected to the second electric hoist, with the end of the second pull rope away from the second electric hoist connected to the right side of the first support frame 1. In this embodiment, the telescopic drive device is a hydraulic cylinder. In other embodiments of the present invention, the telescopic drive device can be a lifting device such as a mechanical jack.

[0048] In this embodiment, Figure 2 As shown, the first support frame 1 includes a first support column 11, a second support column 12, and a first connecting beam 13, which are spaced apart from each other. The first support column 11 and the second support column 12 are spaced apart from each other from each other. One end of the first connecting beam 13 is fixedly connected to the middle of the first support column 11, and the other end of the first connecting beam 13 is fixedly connected to the middle of the second support column 12. The upper ends of the first support column 11 and the upper ends of the second support column 12 are both hinged to the upper end of the second support frame 2, and the lower ends of the first support column 11 and the lower ends of the second support column 12 are both fixedly connected to a first connecting eye plate. The arrangement of the first support column, the second support column, and the connecting beam ensures the stability of the first support frame 1.

[0049] The upper end of the rotary chassis 200 is fixed with two second connection eye plates spaced apart from each other. In step S1, the process of hinge-connecting the upper ends of the first support frame and the second support frame includes:

[0050] First, assemble the second support frame 2, then hinge the upper end of the first support column 11 and the upper end of the second support column 12 to the upper end of the second support frame 2, and then adjust the distance between the lower end of the first support column 11 and the lower end of the second support column 12 so that the distance between the two first connecting eye plates matches the distance between the two second connecting eye plates, thereby facilitating the assembly of the first connecting eye plates and the second connecting eye plates after hoisting.

[0051] In this embodiment, the temporary support structure 3 is a column, one end of which is welded to the middle of the first support frame 1, and the other end of which is welded to the middle of the second support frame 2. In step S4, the temporary support structure 3 is dismantled, including cutting the column.

[0052] In summary, the preferred embodiment of the heavy crane A-frame installation method of the present invention is as follows: first, the A-frame 100 is assembled on the ground or on the deck, the upper ends of the first support frame 1 and the second support frame 2 are hinged, and a temporary support structure 3 is connected to the middle of the first support frame 1 and the middle of the second support frame 2, so that the angle between the first support frame 1 and the second support frame 2 remains fixed; the provision of the temporary support structure 3 enables the first support frame 1 and the second support frame 2 to remain relatively fixed, so that the overall structure of the A-frame 100 is stable, and collision between the first support frame and the second support frame is avoided when a single crane is used for lifting; then the crane's hook is connected to the hinge axis of the first support frame 1 and the second support frame 2, and the crane is used to lift the A-frame 100 above the slewing chassis 200; after the lifting process During the process, the A-frame is in a free hanging state; then the crane is used to move the position of the A-frame 100, and the lower end of one of the first support frame 1 and the second support frame 2 is connected to the slewing chassis 200; finally, the temporary support structure 3 is removed, the angle between the first support frame 1 and the second support frame 2 is adjusted, and the lower end of the other one of the first support frame 1 and the second support frame 2 is connected to the slewing chassis 200; after the temporary support structure 3 is removed, the first support frame 1 and the second support frame 2 can rotate with each other, and then the angle between the first support frame and the second support frame can be adjusted. Therefore, the heavy crane A-frame installation method of the present invention can realize the installation of the A-frame with a single crane, reducing the crane resource investment and the skill level requirements for the crane operator.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A heavy crane A-frame installation method, characterized in that: The following steps are involved: Step S1, assembling an A-frame (100) on the ground or on a deck, hinge the upper ends of the first support frame (1) and the second support frame (2), and connect a temporary support structure (3) at the middle of the first support frame (1) and the middle of the second support frame (2), so that the angle between the first support frame (1) and the second support frame (2) remains fixed; Step S2, connecting the hook of the crane to the hinge axis of the first support frame (1) and the second support frame (2), and using the crane to lift the A-frame (100) above the slewing chassis (200); Step S3, using the crane to move the position of the A-frame (100), and connecting the lower end of one of the first support frame (1) and the second support frame (2) to the rotary chassis (200); Step S4: dismantle the temporary support structure (3), adjust the angle between the first support frame (1) and the second support frame (2), and connect the lower end of the other of the first support frame (1) and the second support frame (2) to the rotary chassis (200).

2. The heavy crane A-frame installation method according to claim 1, characterized in that: In the step S1, the temporary support structure (3) is connected at the middle of the first support frame (1) and the middle of the second support frame (2), comprising: The hook is connected to the middle of the first support frame (1) or the middle of the second support frame (2), and the first support frame (1) or the second support frame (2) is lifted to increase the angle between the first support frame (1) and the second support frame (2); one end of the temporary support structure (3) is then connected to the middle of the first support frame (1), and the other end of the temporary support structure (3) is connected to the middle of the second support frame (2); thereafter, the hook is removed from the middle of the first support frame (1) or the middle of the second support frame (2).

3. The heavy crane A-frame installation method according to claim 1, characterized in that: The upper end of the rotary chassis (200) is fixed with a second connection eye plate, and the lower end of the first support frame (1) is fixed with a first connection eye plate. In step S3, the lower end of the first support frame (1) is connected to the rotary chassis (200), comprising: A first pulling mechanism for pulling the first support frame (1) to swing leftward is connected to the left side of the first support frame (1), and a second pulling mechanism for pulling the first support frame (1) to swing rightward is connected to the right side of the first support frame (1). The first pulling mechanism and the second pulling mechanism are used to adjust the position of the first connecting eye plate in the left-right direction to match the second connecting eye plate.

4. The heavy crane A-frame installation method according to claim 3, characterized in that: In the step S3, the lower end of the first support frame (1) is connected to the rotary chassis (200), comprising: The first support frame (1) is moved downward by the crane so that the connection hole of the first connection eye plate is lower than the connection hole of the second connection eye plate; a vertically arranged telescopic drive device is provided on the rotary chassis (200), and the upper end of the telescopic drive device pushes the first support frame (1) to rise or fall, so as to adjust the position of the first connection eye plate in the vertical direction to match the second connection eye plate.

5. The heavy crane A-frame installation method according to claim 3, characterized in that: The first pulling mechanism comprises a first electric hoist connected to the left side of the rotary chassis (200) and a first pull rope connected to the first electric hoist, wherein an end of the first pull rope away from the first electric hoist is connected to the left side of the first support frame (1); The second pulling mechanism comprises a second electric hoist connected to the right side of the rotary chassis (200) and a second pull rope connected to the second electric hoist, wherein the end of the second pull rope away from the second electric hoist is connected to the right side of the first support frame (1).

6. The heavy crane A-frame installation method according to claim 1, characterized in that: The first support frame (1) comprises a first support column (11), a second support column (12) and a first connecting beam (13) which are arranged at intervals in front and back, the first support column (11) and the second support column (12) are arranged at intervals in front and back, one end of the first connecting beam (13) is fixedly connected to the middle part of the first support column (11), and the other end of the first connecting beam (13) is fixedly connected to the middle part of the second support column (12); the upper end of the first support column (11) and the upper end of the second support column (12) are both hinged to the upper end of the second support frame (2), and the lower end of the first support column (11) and the lower end of the second support column (12) are both fixedly connected to a first connecting eye plate.

7. The heavy crane A-frame installation method according to claim 6, characterized in that: Two second connection eye plates are fixed to the upper end of the rotary chassis (200) and are spaced apart from each other. In step S1, the upper ends of the first support frame (1) and the second support frame (2) are hinged, including: First, the second support frame (2) is assembled, and then the upper end of the first support column (11) and the upper end of the second support column (12) are hinged to the upper end of the second support frame (2), and then the distance between the lower end of the first support column (11) and the lower end of the second support column (12) is adjusted so that the distance between the two first connecting eye plates matches the distance between the two second connecting eye plates.

8. The heavy crane A-frame installation method according to claim 1, characterized in that: The temporary support structure (3) is a column, one end of the column is welded to the middle of the first support frame (1), and the other end of the column is welded to the middle of the second support frame (2).

9. The heavy crane A-frame installation method according to claim 8, characterized in that: In the step S4, dismantling the temporary support structure (3) includes: The cylinder is severed.

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