A method for installing a luffing winding system of a dragline crane

Abstract

The present application relates to a kind of luffing winding system installation method of spud leg crane.The installation includes the following steps: when luffing wire rope is threaded, luffing wire rope is wound into pulley block reel: arm support is in 3 ° shelf state and luffing wire rope is installed;After luffing wire rope is retracted after arm support is lifted to 12 °;After luffing wire rope is tightened after arm support is lifted to 16.65 °: main hook threading: main hook wire rope is pulled into pulley block and main hook reel by using guide rope;By using two main hook reels reverse pulling, realize the pre-tightening force of main hook wire rope safety number;Sub-hook threading: using guide rope to pull sub-hook wire rope into fixed and movable pulley block in reverse.The present application has the advantages that: when installing, arm support angle is reduced to 3 °, and redundancy waste of luffing wire rope is avoided by using tooling guide rope;When main hook threading, by using two main hook reels reverse pulling, realize the pre-tightening force of wire rope safety number;During sub-hook threading process, avoid multiple pulley block pre-tightening force winding lifting movable pulley during threading process.

Description

Technical Field

[0001] The present invention relates to the technical field of crane winding systems, and in particular to an installation method of a luffing winding system of a jib crane. Background Art

[0002] The 5000T jib crane is a single-jib luffing crane with a rated lifting capacity of 5000T. The jib is a truss structure, with two sets of 2500T four-claw hooks symmetrically set on the jib head. The two main hooks can act independently or in linkage. When the two main hooks are linked, the rated lifting capacity reaches 5000T, the outboard amplitude is not less than 45m, and the lifting height is 133m on the deck. It automatically adjusts and synchronizes when linked. The luffing winding adopts a double pulley design, and the structure is intensive.

[0003] In the prior art, when installing the luffing wire rope winding system for a jib crane, the boom assembly angle and the luffing wire rope installation angle are usually unchanged, typically 8°. This requires the wire rope to be of sufficient length, resulting in redundant waste after installation. Furthermore, the tire frame is arranged at a high height, requiring high-altitude work. Generally, the installation of the cable segment requires the use of a lifting device, which is cumbersome. When threading the main hook, there is a problem of insufficient rope capacity on the drum, making it difficult to operate the wire rope safety coil preload. During the auxiliary hook threading process, the preload of the multi-ratio pulley block may be wrapped around the lifting movable pulley. Therefore, it is necessary to provide a method for installing the luffing winding system for a jib crane. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for installing the variable-length winding system of a jib crane, which can solve the problems in the prior art that the wire rope needs to be of sufficient length, redundant waste will occur after installation, the layout height of the tire frame is relatively high, high-altitude operations are required, the installation of the rope segment is troublesome, the main hook rope threading drum has insufficient rope capacity, the pre-tightening force of the safety coils of the wire rope is troublesome to operate, and the pre-tightening force of the multi-rate pulley group will be wrapped around the lifting movable pulley when the auxiliary hook rope is threaded.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] S1. When the luffing wire rope is threaded, the luffing wire rope is wound into the pulley assembly and then into the drum, and the cable socket is installed:

[0007] S1.1. After the jib of the jib crane is assembled, the jib is in the 3° shelf position for the installation of the luffing wire rope;

[0008] S1.2. Insert the fiber rope into the pulley block at the head of the jib and boom of the jib crane, and weave the fiber rope with the hemp core steel wire rope. Drive the electric winch to extract the fiber rope. At this time, the hemp core steel wire rope enters the pulley block.

[0009] S1.3. Weld the hemp core steel wire rope to the guide rope, drive the electric winch to pull out the hemp core steel wire rope, and then put the guide rope into the pulley block;

[0010] S1.4. Weld the guide rope and the luffing wire rope together, insert the luffing wire rope into the pulley block and then into the luffing winch drum through the guide rope, and cast the cable segment deck on site;

[0011] S1.5. After the cable socket is poured and qualified, use the main hook drum and the main hook herringbone redirection pulley to pull the cable socket to the vicinity of the main root for installation;

[0012] S2. After the boom is raised from 3° to 12°, the luffing wire rope is retracted:

[0013] S2.1. Use a floating crane to assist in lifting the boom to 12°, while the luffing wire rope is being lifted and retracted, leaving the wire rope in a relaxed state.

[0014] S2.2. Pull out the guide rope, put the luffing wire rope into the rope pressing plate, and put it on the reel;

[0015] S3. After the boom is raised from 12° to 16.65°, tighten the wire rope:

[0016] S3.1. Continue to reel in the luffing wire rope, and synchronously raise the boom to 16.65° with the floating crane. When the boom angle exceeds 12°, the wire rope begins to tighten normally.

[0017] S3.2. Tighten the luffing wire rope normally, leaving 6 safety circles and marking the cut-off points;

[0018] S4. Threading the main hook:

[0019] S4.1. The mother ship is docked at the pier, and the jib head of the jib crane is located on the east side of the 500T gantry crane;

[0020] S4.2. Insert the fiber rope into the pulley block of the main hook, and weave the fiber rope with the hemp core steel wire rope. Drive the electric winch to extract the fiber rope. At this time, the hemp core steel wire rope enters the pulley block.

[0021] S4.3. Weld the hemp core wire rope and the main hook wire rope together. Use the lead rope to thread the main hook wire rope into the main hook drum A and secure it with the rope pressing plate. Continue to drive the winch until the end of the wire rope reaches the vicinity of the movable pulley.

[0022] S4.4. Use the guide rope to pull the main hook wire rope back into the pulley block and main hook drum B, and press the rope plate upward to secure it.

[0023] S4.5. The hook head of the main hook is hung on the water tank, and the main hook drum A and the main hook drum B are pulled in opposite directions to achieve the pre-tightening force of the main hook wire rope with a safe number of turns;

[0024] S5. Threading the rope through the auxiliary hook:

[0025] S5.1. Insert the fiber rope into the pulley block of the auxiliary hook, insert the fiber rope into the hemp core steel wire rope, and drive the electric winch to extract the fiber rope. At this time, the hemp core steel wire rope enters the pulley block;

[0026] S5.2. Weld the hemp core wire rope and the auxiliary hook wire rope together. Use the lead rope to thread the auxiliary hook wire rope into the auxiliary hook drum and secure it with the rope pressing plate. Set the preload and continue to drive the winch until the end of the wire rope reaches the tensioner.

[0027] S5.3. Insert the guide rope into the fixed and movable pulley blocks of the auxiliary hook, and use the guide rope to pull the auxiliary hook wire rope back into the fixed and movable pulley blocks;

[0028] S5.4. Complete the casting and installation of the cable socket.

[0029] Furthermore, in the step S3.2, the steel wire rope is positioned and assembled on the drum flange plate without any relative friction between the steel wire rope and the drum flange plate.

[0030] Furthermore, after the luffing wire rope is tightened, the boom is further lifted from 16.65° to 27°, and then the excess luffing wire rope is cut off, and the luffing wire rope is re-pressed on the rope plate; the first, second, and third circles of the luffing wire rope are pre-tightened synchronously with the corresponding motor torque, completing the pre-tightening force on the drum of the luffing wire rope.

[0031] Furthermore, in step S4, when the main hook wire rope is passing through the main hook drum A, the main hook wire rope passes through the fixed pulley group, the swing pulley group, the force measuring pulley group, the middle part of the boom redirecting pulley group, and the herringbone redirecting pulley group to the main hook drum A in sequence.

[0032] Furthermore, in step S5, when the auxiliary hook is threading the rope into the auxiliary hook drum, the auxiliary hook wire rope passes through the boom redirecting pulley, the boom redirecting pulley sensor, the boom redirecting pulley, the herringbone redirecting pulley to the auxiliary hook drum in sequence.

[0033] The advantages of the present invention are that when the luffing wire rope winding system of a jib crane is installed, the boom angle is reduced from 8° to 3°, and the insufficient length of the luffing wire rope can be compensated by using the tooling guide rope, thereby avoiding redundant waste of the luffing wire rope and reducing the height of the frame arrangement to avoid high-altitude operations.

[0034] The luffing wire rope segment is installed in a self-leading manner. It uses the preset rooting point to redirect and the main winch mechanism to pull the segment to the main root position, replacing the traditional lifting equipment, making installation more convenient.

[0035] When threading the main hook, a single wire rope and a single hook are wound on the double drums. The main hook wire rope is first threaded into the main hook drum A in the forward direction. The fixed and movable pulleys are used to meet the problem of insufficient rope capacity of the drum. The main hook wire rope is then threaded from the main hook drum A into the main hook drum B in the reverse direction. The double drums are hung on the water tank. The main hook drums A and B are used to pull in opposite directions to achieve the pre-tightening force of the wire rope with a safe number of turns.

[0036] During the threading process of the auxiliary hook, double drums and double wire ropes are wound on a single hook. The wire rope passes through the arm pulley group and enters the auxiliary hook drum to complete the pre-tightening force, and then enters the fixed and movable pulley group in the reverse direction to avoid the pre-tightening force of the multi-rate pulley group winding around the lifting movable pulley during the threading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the luffing wire rope threading when the boom is at 3°;

[0038] Figure 2 This is a schematic diagram of the luffing wire rope being retracted after the boom is raised from 3° to 12°;

[0039] Figure 3 This is a schematic diagram of the present invention showing the luffing wire rope being tightened after the boom is raised from 12° to 16.65°;

[0040] Figure 4 This is a schematic diagram of the main hook wire rope threading of the present invention;

[0041] Figure 5 This is a schematic diagram of the main hook wire rope of the present invention being passed through the main hook drum A;

[0042] Figure 6 Schematic diagram of the main hook wire rope being reversely threaded into the pulley block and the main hook drum B of the present invention;

[0043] Figure 7 This is a schematic diagram of the auxiliary hook wire rope threading of the present invention;

[0044] Figure 8 This is a schematic diagram of the auxiliary hook wire rope of the present invention being threaded into the auxiliary hook drum;

[0045] Figure 9 This is a schematic diagram of the auxiliary hook wire rope being reversely threaded into the pulley block of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The following examples can enable those skilled in the art to understand the present invention more comprehensively, but the present invention is not limited to the scope of the embodiments.

[0047] This specific implementation adopts the following technical solutions:

[0048] A method for installing a luffing winding system of a jib crane comprises the following steps:

[0049] S1. When the luffing wire rope 1 is threaded, the luffing wire rope is wound into the pulley assembly and the drum, and the cable socket is installed:

[0050] S1.1、 Figure 1 As shown, after the jib of the jib crane is assembled, the jib 10 is in a 3° shelf state for installation of the luffing wire rope 1;

[0051] S1.2. Insert the φ28mm fiber rope into the pulley block at the head of the jib and boom of the jib crane, and then weave the φ28mm fiber rope with the φ24mm hemp core steel wire rope. Drive the electric winch to extract the fiber rope. At this time, the hemp core steel wire rope enters the pulley block.

[0052] S1.3. Weld the φ24mm hemp core steel wire rope and the φ36mm guide rope together. Drive the electric winch to pull out the hemp core steel wire rope. At this time, the φ36mm guide rope enters the pulley block.

[0053] S1.4. Weld the φ36mm guide rope and the luffing wire rope 1 together. Pass the luffing wire rope 1 through the guide rope into the pulley block and then into the luffing winch drum. Then cast the cable segment deck on site.

[0054] S1.5. After the cable segment is poured and qualified, use the main hook drum and the main hook herringbone redirecting pulley to pull the cable segment to the vicinity of the main root for installation.

[0055] S2, such as Figure 2 As shown, after the boom is raised from 3° to 12°, the luffing wire rope 1 is retracted:

[0056] S2.1. Use a floating crane to assist in lifting the boom by 10 to 12 degrees, while simultaneously lifting and retracting the luffing wire rope 1. The luffing wire rope 1 is in a relaxed state.

[0057] S2.2. Pull out the φ36mm lead rope, insert the luffing wire rope 1 into the rope pressing plate, and put it on the reel.

[0058] S3, such as Figure 3 As shown, after the boom 10 is raised from 12° to 16.65°, the luffing wire rope 1 is tightened:

[0059] S3.1. Continue to reel in the luffing wire rope 1, and synchronously raise the boom 10° to 16.65° with the floating crane. When the boom 10° angle exceeds 12°, the luffing wire rope 1 begins to tighten normally.

[0060] S3.2. Tighten the luffing wire rope 1 normally, leaving 6 safety circles as cut-off marks.

[0061] S4, such as Figure 4As shown, thread the main hook:

[0062] S4.1. The mother ship is docked at the pier, and the jib 10 head of the jib crane is located on the east side of the 500T gantry crane;

[0063] S4.2. Insert a φ28mm fiber rope into the pulley block of the main hook, and weave the φ28mm fiber rope with the φ24mm hemp core steel wire rope. Drive the electric winch to pull out the fiber rope. At this time, the hemp core steel wire rope enters the pulley block.

[0064] S4.3, weld the hemp core wire rope and the main hook wire rope 2 together, as shown in the following example: Figure 5 As shown, the main hook wire rope 2 is passed through the main hook drum A3 by the guide rope to fix the rope pressure plate, and the winch is continued to be driven until the end of the main hook wire rope 2 is near the movable pulley. When the main hook wire rope 2 is passing through the main hook drum A3, the main hook wire rope 2 passes through the fixed pulley group 5 in the direction of the boom root and the direction of the boom head in sequence, the swing pulley group 6, the force measuring pulley group 7, the boom middle redirecting pulley group 8, and the herringbone redirecting pulley group 9 to the main hook drum A3.

[0065] S4.4, such as Figure 6 As shown, the main hook wire rope 2 is pulled back into the pulley block and the main hook drum B4 by using the guide rope, and the rope plate is pressed up to fix it;

[0066] S4.5. A 400T water tank is hung on the hook head of the main hook, and the main hook drum A3 and the main hook drum B4 are used to pull in opposite directions to achieve a pre-tightening force of 2 safe turns of the main hook wire rope.

[0067] S5, such as Figure 7 As shown, thread the secondary hook:

[0068] S5.1. Insert the φ28mm fiber rope into the pulley block of the auxiliary hook, and weave the φ28mm fiber rope with the φ24mm hemp core steel wire rope. Drive the electric winch to pull out the fiber rope. At this time, the hemp core steel wire rope enters the pulley block.

[0069] S5.2, weld the hemp core wire rope and the auxiliary hook wire rope 11 together, as shown in the following example: Figure 8 As shown, the auxiliary hook wire rope 11 is passed through the auxiliary hook drum 12 by the lead rope to fix the rope pressing plate, and the preload force 13T is set. The winch is driven continuously until the end of the auxiliary hook wire rope 11 is near the tensioner 13. When the auxiliary hook wire rope is passed through the auxiliary hook drum 12, the auxiliary hook wire rope 11 passes through the middle arm redirecting pulley group 8, the arm redirecting pulley sensor 14, the middle arm redirecting pulley group 8, the A-frame redirecting pulley group 9 to the auxiliary hook drum 12 in sequence.

[0070] S5.3, such as Figure 9 As shown, the fixed and movable pulley blocks of the auxiliary hook are inserted into the guide rope, and the guide rope is used to pull the auxiliary hook wire rope 11 into the fixed and movable pulley blocks in the reverse direction to the electric winch 15.

[0071] S5.4. Complete the casting and installation of the cable socket.

[0072] S6. After the boom is further raised from 16.65° to 27°, approximately 260 meters of excess luffing wire rope 1 is cut off, and the luffing wire rope 1 is re-pressed on the rope plate; when there is no relative friction between the luffing wire rope 1 and the drum flange plate, it is positioned and assembled on the drum flange plate. The tightening torque of the M42 bolt is 2880*0.7=2016Nm.

[0073] The first, second, and third turns of the luffing wire rope 1 are pre-tightened synchronously with the corresponding motor torque, and the pre-tightening force on the drum of the luffing wire rope 1 is completed. The pre-tightening force of the first, second, third, and subsequent turns of the luffing wire rope 1 and the motor output torque of the luffing winch are shown in Table 1.

[0074]

[0075] Table 1

[0076] Boom 10 and herringbone frame adopt fixed product roller design to protect the main structure during the rope threading process. It has a simple structure and is maintenance-free, avoiding subsequent secondary dismantling.

[0077] The herringbone and boom luffing pulley blocks adopt an integrated process structure design, which integrates the split pulley components to meet the requirements of wire rope lateral force buffering during overall assembly and winding system installation.

[0078] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for installing a luffing winding system of a jib crane, characterized by: The following steps are involved: S1. When the luffing wire rope is threaded, the luffing wire rope is wound into the pulley assembly and then into the drum, and the cable socket is installed: S1.

1. After the jib of the jib crane is assembled, the jib is in the 3° shelf position for the installation of the luffing wire rope; S1.

2. Insert the fiber rope into the pulley block at the head of the jib and boom of the jib crane, and weave the fiber rope with the hemp core steel wire rope. Drive the electric winch to extract the fiber rope. At this time, the hemp core steel wire rope enters the pulley block. S1.

3. Weld the hemp core steel wire rope to the guide rope, drive the electric winch to pull out the hemp core steel wire rope, and then put the guide rope into the pulley block; S1.

4. Weld the guide rope and the luffing wire rope together, insert the luffing wire rope into the pulley block and then into the luffing winch drum through the guide rope, and cast the cable segment deck on site; S1.

5. After the cable socket is poured and qualified, use the main hook drum and the main hook herringbone redirection pulley to pull the cable socket to the vicinity of the main root for installation; S2. After the boom is raised from 3° to 12°, the luffing wire rope is retracted: S2.

1. Use a floating crane to assist in lifting the boom to 12°, while the luffing wire rope is being lifted and retracted, leaving the wire rope in a relaxed state. S2.

2. Pull out the guide rope, put the luffing wire rope into the rope pressing plate, and put it on the reel; S3. After the boom is raised from 12° to 16.65°, tighten the wire rope: S3.

1. Continue to reel in the luffing wire rope, and synchronously raise the boom to 16.65° with the floating crane. When the boom angle exceeds 12°, the wire rope begins to tighten normally. S3.

2. Tighten the luffing wire rope normally, leaving 6 safety circles and marking the cut-off points; S4. Threading the main hook: S4.

1. The mother ship is docked at the pier, and the jib head of the jib crane is located on the east side of the 500T gantry crane; S4.

2. Insert the fiber rope into the pulley block of the main hook, and weave the fiber rope with the hemp core steel wire rope. Drive the electric winch to extract the fiber rope. At this time, the hemp core steel wire rope enters the pulley block. S4.

3. Weld the hemp core wire rope and the main hook wire rope together. Use the lead rope to thread the main hook wire rope into the main hook drum A and secure it with the rope pressing plate. Continue to drive the winch until the end of the wire rope reaches the vicinity of the movable pulley. S4.

4. Use the guide rope to pull the main hook wire rope back into the pulley block and main hook drum B, and press the rope plate upward to secure it. S4.

5. The hook head of the main hook is hung on the water tank, and the main hook drum A and the main hook drum B are pulled in opposite directions to achieve the pre-tightening force of the main hook wire rope with a safe number of turns; S5. Threading the rope through the auxiliary hook: S5.

1. Insert the fiber rope into the pulley block of the auxiliary hook, insert the fiber rope into the hemp core steel wire rope, and drive the electric winch to extract the fiber rope. At this time, the hemp core steel wire rope enters the pulley block; S5.

2. Weld the hemp core wire rope and the auxiliary hook wire rope together. Use the lead rope to thread the auxiliary hook wire rope into the auxiliary hook drum and secure it with the rope pressing plate. Set the preload and continue to drive the winch until the end of the wire rope reaches the tensioner. S5.

3. Insert the guide rope into the fixed and movable pulley blocks of the auxiliary hook, and use the guide rope to pull the auxiliary hook wire rope back into the fixed and movable pulley blocks; S5.

4. Complete the casting and installation of the cable socket.

2. The method for installing a luffing winding system of a jib crane according to claim 1, characterized in that: In the step S3.2, the steel wire rope is positioned and assembled on the drum flange plate without any relative friction between the steel wire rope and the drum flange plate.

3. The method for installing a luffing winding system of a jib crane according to claim 1, characterized in that: After the luffing wire rope is tightened, the boom is further lifted from 16.65° to 27°, and then the excess luffing wire rope is cut off, and the luffing wire rope is re-pressed on the rope plate; the first, second, and third turns of the luffing wire rope are pre-tightened in synchronization with the motor torque, and the pre-tightening force on the drum of the luffing wire rope is completed.

4. The method for installing a luffing winding system of a jib crane according to claim 1, characterized in that: In step S4, when the main hook wire rope is passing through the main hook drum A, the main hook wire rope passes through the fixed pulley block, the swing pulley block, the force measuring pulley block, the boom middle redirecting pulley block, and the A-shaped redirecting pulley block to the main hook drum A in sequence.

5. The method for installing a luffing winding system of a jib crane according to claim 1, characterized in that: In step S5, when the auxiliary hook wire rope is being threaded into the auxiliary hook drum, the auxiliary hook wire rope passes through the boom redirecting pulley, the boom redirecting pulley sensor, the boom redirecting pulley, the herringbone redirecting pulley to the auxiliary hook drum in sequence.

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