Installation method of derrick crane variable-amplitude winding system

Abstract

The invention relates to an installation method of a derrick crane variable-amplitude winding system. The mounting method comprises the following steps that when the variable-amplitude steel wire rope is threaded, the variable-amplitude steel wire rope is wound into a pulley block and enters a winding drum; the variable-amplitude steel wire rope is mounted when the boom is in a 3-degree shelf state; after the cantilever crane is lifted to 12 degrees, the variable-amplitude steel wire rope is retracted; the steel wire rope is tightened after the boom is lifted to 16.65 degrees; main hook rope threading is conducted, specifically, the steel wire rope of the main hook is reversely pulled into a pulley block and a main hook winding drum through a guide rope; the two main hook winding drums are oppositely pulled in the reverse direction, and the main hook steel wire rope safety circle number pre-tightening force is achieved; the auxiliary hook steel wire rope is pulled to reversely enter the fixed pulley block and the movable pulley block through the guide rope. The method has the advantages that the angle of the arm support is reduced to 3 degrees during installation, compensation is conducted through the tool guide rope, and redundant waste of the variable-amplitude steel wire rope is avoided; when the main hook is stringed, the two main hook winding drums are oppositely pulled in opposite directions, so that the pre-tightening force of the safety number of turns of the steel wire rope is realized; and in the rope threading process of the auxiliary hook, the movable pulley is prevented from being wound and lifted by the pre-tightening force of the multi-magnification pulley block in the rope threading process.

Description

Technical Field

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

[0002] The 5000T jib crane is a single-arm luffing crane with a rated lifting capacity of 5000T. The boom is a truss structure, and two sets of 2500T four-claw hooks are symmetrically set on the head of the boom. The two main hooks can act independently or in linkage. When the double 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 is a double pulley design, and the structure is intensive.

[0003] In the prior art, when installing the luffing wire rope winding system of a jib crane, the jib angle during the overall assembly of the jib and the installation of the luffing wire rope is usually unchanged, generally 8°, requiring the wire rope to be of sufficient length, which will result in redundancy and waste after installation, and the arrangement height of the tire frame is relatively high, requiring high-altitude work; generally, the installation of the cable segment needs to be carried out through a lifting device, which is troublesome to install; when the main hook is threaded, there will be a problem of insufficient rope capacity of the drum, and the operation of the pre-tightening force of the safety number of wire rope turns is troublesome, and during the threading of the auxiliary hook, there is a possibility that the pre-tightening force of the multi-ratio pulley block will be wrapped around the lifting movable pulley. Therefore, it is necessary to provide an installation method for the luffing winding system of 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 have 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 safety number of turns of the wire rope is troublesome to operate the pre-tightening force, and the auxiliary hook rope threading will cause the pre-tightening force of the multiple-rate pulley group to wrap around the lifting movable pulley.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: comprising the following steps: S1. When the luffing wire rope is threaded, the luffing wire rope is wound into the pulley assembly and the drum, and the cable segment is installed: S1.1. After the jib of the jib crane is assembled, the jib is in the 3° shelf state 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, insert the fiber rope and the hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then the hemp core steel wire rope enters the pulley block; S1.3, weld the hemp core steel wire rope and the guide rope, drive the electric small winch to pull out the hemp core steel wire rope, and then the guide rope enters the pulley block; S1.4. Weld the guide rope and the luffing wire rope together, pass the luffing wire rope into the pulley block through the guide rope, and then into the luffing winch drum, and cast the cable segment deck on site; S1.5. After the cable segment is poured and qualified, use the main hook drum and the main hook herringbone redirection pulley to pull the cable segment 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 floating crane to assist in lifting the boom to 12°, and lift and retract the luffing wire rope while the wire rope is 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 drum; S3. Tighten the wire rope after the boom is raised from 12° to 16.65°: S3.1. Continue to wind up the luffing wire rope, and synchronously lift the boom to 16.65° with the floating crane. When the boom angle is above 12°, the wire rope will start to be tightened normally. S3.2. Tighten the luffing wire rope normally, leaving 6 safety circles and making cut-off marks; S4. Main hook threading: 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, insert the fiber rope and the hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then 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, insert the main hook wire rope into the main hook drum A through the guide rope, fix it with the rope pressing plate, and 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 the main hook drum B, and press the rope plate upward to fix it; S4.5. The hook head of the main hook is hung with a water tank, and the main hook drum A and the main hook drum B are used to pull 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 and the hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then the hemp core steel wire rope enters the pulley block; S5.2. Weld the hemp core steel wire rope and the auxiliary hook steel wire rope together, insert the auxiliary hook steel wire rope into the auxiliary hook drum through the guide rope, fix it with the rope pressing plate, set the preload force, and continue to drive the winch until the end of the steel wire rope is near 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 into the fixed and movable pulley blocks in the reverse direction; S5.4. Complete the casting and installation of the cable joint.

[0006] 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.

[0007] 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 pressed onto the rope plate again; the first, second, and third circles of the luffing wire rope are pre-tightened synchronously with the corresponding motor torque, and the pre-tightening force on the drum of the luffing wire rope is completed.

[0008] 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 block, the swing pulley block, the force measuring pulley block, the middle redirecting pulley block of the boom, and the herringbone redirecting pulley block to the main hook drum A in sequence.

[0009] 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.

[0010] The invention has the advantages that when the luffing wire rope winding system of the jib crane is installed, the boom angle is reduced from 8° to 3°, and the luffing wire rope is insufficient in length, which can be compensated by the tooling guide rope to avoid redundant waste of the luffing wire rope, and the height of the frame arrangement can be reduced to avoid high-altitude operations; The luffing wire rope segment is installed in a self-leading manner, using the preset rooting point redirection and the main body winch mechanism to pull the rope segment to the main root position, replacing the traditional lifting equipment, which is more convenient to install; When the main hook is threaded, the double drums are wound with a single wire rope and a single hook. The main hook wire rope is first threaded into the main hook drum A, and the fixed and movable pulley block is used to meet the problem of insufficient rope capacity of the drum. The main hook wire rope is reversely threaded from the main hook drum A to the main hook drum B. The double drums are hung in a water tank, and the main hook drums A and B are used to pull in opposite directions to achieve the pre-tightening force of the safe number of wire rope turns; During the threading process of the auxiliary hook, double drums and double wire ropes are wound on a single hook, and the wire rope passes through the arm pulley block and enters the auxiliary hook drum to complete the pre-tightening force, and then enters the fixed and movable pulley block in the reverse direction to avoid the pre-tightening force of the multi-rate pulley block winding around the lifting movable pulley during the threading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the luffing steel wire rope threading of the present invention when the boom is 3°; Figure 2 It is a schematic diagram of the present invention in which the luffing wire rope is retracted after the boom is raised from 3° to 12°; Figure 3 It is a schematic diagram of tightening the luffing wire rope after the boom is raised from 12° to 16.65° in the present invention; Figure 4This is a schematic diagram of the main hook wire rope threading of the present invention; Figure 5 It is a schematic diagram of the main hook wire rope of the present invention being inserted into the main hook drum A; Figure 6 It is a schematic diagram of the main hook wire rope of the present invention being reversely threaded into the pulley block and the main hook drum B; Figure 7 This is a schematic diagram of the wire rope threading of the auxiliary hook of the present invention; Figure 8 It is a schematic diagram of the auxiliary hook wire rope of the present invention being inserted into the auxiliary hook drum; Fig. 9 It is a schematic diagram of the reverse insertion of the auxiliary hook wire rope into the pulley block of the present invention. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution 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 implementation methods. The following embodiments can enable technicians in this field to understand the present invention more comprehensively, but the present invention is not limited to the scope of the embodiments.

[0013] This specific implementation adopts the following technical solutions: A method for installing a luffing winding system of a jib crane comprises the following steps: 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 segment installation is completed: S1.1, if 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; S1.2, insert the φ28mm fiber rope into the jib and jib 10 head pulley block of the jib crane, insert the φ28mm fiber rope and the φ24mm hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then the hemp core steel wire rope enters the pulley block; 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, and then the φ36mm guide rope enters the pulley block; S1.4. Weld and connect the φ36mm guide rope and the luffing wire rope 1, insert the luffing wire rope 1 into the pulley block through the guide rope, and then into the luffing winch drum, and cast the cable segment deck on site; 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.

[0014] S2, such as Figure 2 As shown in the figure, after the boom is raised from 3° to 12°, the luffing wire rope 1 is retracted: S2.1. Use floating crane to assist in lifting the boom by 10 to 12 degrees, and the luffing wire rope 1 is lifted and retracted at the same time, and the luffing wire rope 1 is in a relaxed state; S2.2. Pull out the φ36mm guide rope, put the luffing wire rope 1 into the rope pressing plate, and put it on the reel.

[0015] S3, such as Figure 3 As shown, the boom 10 is lifted from 12° to 16.65° and then the luffing wire rope 1 is tightened: S3.1, luffing wire rope 1 continues to be reeled in, synchronous floating crane assists in lifting the boom 10 to 16.65°, when the boom 10 angle exceeds 12°, luffing wire rope 1 starts to be tightened normally; S3.2. Tighten the luffing wire rope 1 normally, leaving 6 safety circles and marking the cutoff.

[0016] S4, such as Figure 4 As shown, thread the main hook: S4.1. The mother ship is docked at the pier, and the head of the jib 10 of the jib crane is located on the east side of the 500T gantry crane; S4.2. Insert the φ28mm fiber rope into the pulley block of the main hook, insert the φ28mm fiber rope and the φ24mm hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then the hemp core steel wire rope enters the pulley block; S4.3, weld the hemp core wire rope and the main hook wire rope 2 together, such as Figure 5 As shown, the main hook wire rope 2 is inserted into the main hook drum A3 by the guide rope to fix the rope pressing plate, and the winch is continuously driven until the end of the main hook wire rope 2 is near the movable pulley. When the main hook wire rope 2 is inserted into the main hook drum A3, the main hook wire rope 2 passes through the fixed pulley block 5 in the direction of the boom root and the direction of the boom head in sequence, the swing pulley block 6, the force measuring pulley block 7, the boom middle redirection pulley block 8, and the A-frame redirection pulley block 9 to the main hook drum A3.

[0017] 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 upward to fix it; 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 for reverse pulling to achieve a pre-tightening force of 2 safe turns of the main hook wire rope.

[0018] S5, such as Figure 7 As shown, thread the secondary hook: S5.1. Insert the φ28mm fiber rope into the pulley block of the auxiliary hook, insert the φ28mm fiber rope and the φ24mm hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then the hemp core steel wire rope enters the pulley block; S5.2, weld the hemp core wire rope and the auxiliary hook wire rope 11 together, such as Figure 8As shown, the auxiliary hook wire rope 11 is passed through the auxiliary hook drum 12 by the guide rope to fix the rope pressing plate, and the preload force 13T is set, and 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 redirecting pulley block 8 of the boom, the boom redirecting pulley sensor 14, the middle redirecting pulley block 8 of the boom, the herringbone redirecting pulley block 9 to the auxiliary hook drum 12 in sequence.

[0019] S5.3, if Fig. 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.

[0020] S5.4. Complete the casting and installation of the cable joint.

[0021] S6. After the boom is further lifted from 16.65° to 27°, cut off about 260 meters of excess luffing wire rope 1, and put the luffing wire rope 1 back on the rope plate; when there is no relative friction between the luffing wire rope 1 and the drum flange plate, position and install it on the drum flange plate, and the tightening torque of the bolt M42 is 2880*0.7=2016Nm.

[0022] 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 of the drum on 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.

[0023] Table 1 Boom 10 and herringbone frame adopt fixed productized roller design to protect the main structure during the rope threading process. It has a simple structure, is maintenance-free, and avoids subsequent secondary dismantling.

[0024] The herringbone and boom luffing pulley blocks adopt an integrated process structure design, which integrates the split pulley components to meet the needs of lateral force buffering of the wire rope during the overall assembly and winding system installation.

[0025] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

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

1. After the jib of the jib crane is assembled, the jib is in the 3° shelf state 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, insert the fiber rope and the hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then the hemp core steel wire rope enters the pulley block; S1.3, weld the hemp core steel wire rope and the guide rope, drive the electric small winch to pull out the hemp core steel wire rope, and then the guide rope enters the pulley block; S1.

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

5. After the cable segment is poured and qualified, use the main hook drum and the main hook herringbone redirection pulley to pull the cable segment 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 floating crane to assist in lifting the boom to 12°, and lift and retract the luffing wire rope while the wire rope is 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 drum; S3. Tighten the wire rope after the boom is raised from 12° to 16.65°: S3.

1. Continue to wind up the luffing wire rope, and synchronously lift the boom to 16.65° with the floating crane. When the boom angle is above 12°, the wire rope will start to be tightened normally. S3.

2. Tighten the luffing wire rope normally, leaving 6 safety circles and making cut-off marks; S4. Main hook threading: 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, insert the fiber rope and the hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then 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, insert the main hook wire rope into the main hook drum A through the guide rope, fix it with the rope pressing plate, and 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 the main hook drum B, and press the rope plate upward to fix it; S4.

5. The hook head of the main hook is hung with a water tank, and the main hook drum A and the main hook drum B are used to pull 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 and the hemp core steel wire rope, drive the electric small winch to pull out the fiber rope, and then the hemp core steel wire rope enters the pulley block; S5.

2. Weld the hemp core steel wire rope and the auxiliary hook steel wire rope together, insert the auxiliary hook steel wire rope into the auxiliary hook drum through the guide rope, fix it with the rope pressing plate, set the preload force, and continue to drive the winch until the end of the steel wire rope is near 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 into the fixed and movable pulley blocks in the reverse direction; S5.

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

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°, then the excess luffing wire rope is cut off and the luffing wire rope is pressed onto the rope plate again; the first, second and third circles of the luffing wire rope are pre-tightened synchronously with the corresponding motor torque to complete the pre-tightening force on the drum of the luffing wire rope.

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 redirection pulley block, and the A-frame redirection 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 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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