Method for efficiently pulling back super-long winding steel wire rope of crawler crane

Abstract

The invention relates to a method for efficiently pulling back a super-long hoisting steel wire rope of a crawler crane, which comprises the following steps of: during the assembly period of the crawler crane, assembling a pin hole space of an original hook head pulley block by utilizing a main arm head, matching with a tool of a reversing roller device, and utilizing reversing and supporting functions of the steel wire rope reversing roller device and traction force within an auxiliary hoisting rated load; and the position of a hook head pulley block of the main arm head is guided by the main lifting winch. Then, a variable-amplitude fly jib rear mast and a variable-amplitude fly jib front mast are installed, the variable-amplitude fly jib rear mast and the variable-amplitude fly jib front mast are integrally hoisted and installed at the tail of a lower section jib of the variable-amplitude fly jib through an auxiliary crane, and then an auxiliary winding steel wire rope is wound on a pulley block of the variable-amplitude fly jib rear mast and the variable-amplitude fly jib front mast in the opposite direction of a rope winding diagram; and the auxiliary variable-amplitude winding steel wire rope is guided to a guide pulley of a specified auxiliary arm head by recovering the auxiliary winding steel wire rope. The long-distance steel wire rope can be dragged to effectively move and wind.

Description

Technical Field

[0001] The invention belongs to the field of marine ship design and construction, and in particular relates to a method for efficiently pulling back an extra-long winch wire rope of a crawler crane. Background Art

[0002] Crawler cranes are widely used in various engineering fields, and they are also widely used in the field of shipbuilding. During the construction of ships, the lifting capacity and lifting radius of the portal cranes on both sides of the dock are limited, and the number of gantry cranes above the dock is limited. As an important resource, they are limited in coordination when used for long-term coordinated operations in small and medium-sized enterprises. During the auxiliary shipbuilding process, when working at a certain point in a certain area for a long time, it is necessary to use crawler cranes to cooperate with the lifting to reduce the time occupied by the gantry crane. Take the on-site relocation of the Sany (SCC4000A) 400t crawler crane and the assembly of the LJDB tower jib as an example. Due to the need to assemble the LJDB tower jib working condition that exceeds the height and span of the deck equipment, the main reel and luffing jib winch wire rope of the crawler crane are more than 100 meters long. It is impossible to automatically pull the main reel and luffing jib winch wire rope through the auxiliary winch of the crawler crane to complete the pulley wire rope winding process. When the auxiliary winch is pulling the main reel and luffing jib winch wire rope with a length of more than 100 meters, the overall resistance is very large, which directly causes the auxiliary winch to unload and idle. Therefore, it is necessary to manually drag the wire rope to complete the threading and winding. However, manual direct dragging of the wire rope is time-consuming and laborious. Personnel have to climb up to manually wind the wire rope, which increases the risk during the operation and the assembly progress is bound to be seriously affected.

[0003] During the assembly of the LJDB66m+60m tower jib, the required main boom length exceeded the new vehicle test and the process example of the LJDB36m main boom listed in the assembly and disassembly instructions. Problems such as long-distance dragging, excessive tension of the wound wire rope, no pulley block at the main boom head and no wire rope roller at the corresponding position occurred. It was impossible to complete the pulley block wire rope winding process by pulling the No. 1 main winch and the No. 4 variable-length jib winch wire rope through the No. 6 auxiliary winch on site. According to the instruction manual example provided by the crawler crane manufacturer for assembling and disassembling the LJDB working condition main boom of 36m, the No. 6 auxiliary winch can be used to pull the No. 1 main winch and the No. 4 luffing jib winch wire rope to complete the pulley block wire rope winding process. However, the actual assembly of the LJDB working condition main boom is 66m long, and it also has to pass through a 60m long jib. The No. 4 luffing jib winch wire rope needs to be dragged not only over a long distance but also needs to be wound around the pulley blocks of the upper and lower masts of the luffing jib. Since the winding ratio and spacing of the upper and lower mast pulley blocks of the jib are high, the sliding friction resistance of the wire rope is very large.

[0004] In fact, when trying to operate the No. 6 auxiliary winch to pull the No. 4 variable-luffing jib winch wire rope, the auxiliary winch's dragging pressure exceeded the rated pressure, causing the pressure relief valve to open and stop. When trying to manually drag the No. 1 main winch and No. 4 variable-luffing jib winch wire ropes directly, it is because dragging the wire ropes over long distances consumes too much manpower, time and corresponding costs. If the process is changed, it will require the cooperation of aerial work vehicles and personnel to climb high to manually wind the wire ropes. The risk during the operation will increase, and the assembly progress will inevitably be seriously affected. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for efficiently pulling back the super-long hoisting wire rope of a crawler crane, aiming to achieve the purpose of assembling the LJDB66m+60m tower jib without consuming manpower and time. The technical solution adopted is: An efficient method for pulling back the extra-long hoisting wire rope of a crawler crane. The main arm is 66m long and the auxiliary arm is 60m long. The main arm and the auxiliary arm are assembled. The specific operations are as follows: S1, install the superlift mast, use an auxiliary crane to lift and assemble the lower arm D2, middle arm D4 and upper arm D1 of the superlift mast in sequence with slings, and insert the connecting pins and pins to connect them together to form a superlift mast.

[0006] S2, adjust the main luffing mast to 60°, use the auxiliary crane to lift the entire superlift mast, install the superlift mast lower boom D2 on the connecting hole of the main platform, and insert the pin, use the auxiliary crane to move the backpack pulley block on the superlift mast lower boom D2 to the front end of the superlift mast upper boom D1, and fix it with a pin.

[0007] S3: Connect the hydraulic pipeline and electrical circuit of the super hoisting winch W5 to make the super hoisting winch W5 meet the use requirements.

[0008] S4: Release the main luffing winch W3, drop the main luffing mast Z forward to 25°, and connect the outer pull plate on the main luffing mast Z with the inner pull plate on the superlift mast intermediate section D4 with a pin.

[0009] S5: Install the pulley block at the top of the superlift mast upper boom D1, release and thread the wire rope on the auxiliary luffing winch W4 and superlift luffing winch W5, reel in the wire rope on the main luffing winch W3, tighten the pull plate between the main luffing mast Z and the superlift mast, and lift the superlift mast.

[0010] S6: Installation of the main boom with super-lift mast: Use a sling to connect the lower boom section H2 of the main boom to the auxiliary crane, lift the lower boom section H2 of the main boom and install it to the main platform, and then install the intermediate boom section H6, intermediate boom section H8A, intermediate boom section H8B, reducer boom section H4, and connecting section H9 in sequence.

[0011] S7: Release the main luffing winch W3 and the super-lifting luffing winch W5, lower the super-lifting luffing pulley assembly, and connect it with the inner pull plate on the lower boom H2 of the main boom.

[0012] S8: Release the wire rope on the main hoisting winch W1, use the auxiliary winch W6 to guide the wire rope of the main hoisting winch W1 to the pulley at the top of the connecting section H9, and horizontally install the crawler crane traction winch wire rope reversing drum device in the upper M and lower pin holes N of the hook head pulley block of the main boom arm HT.

[0013] S9: Disconnect the wire rope connected between the main hoisting winch W1 and the auxiliary hoisting winch W6 through the shackle, guide the wire rope on the main hoisting winch W1 to pass around the outer sides of the upper and lower pin holes of the hook pulley block horizontally installed on the main boom arm HT, and reconnect the wire ropes of the main hoisting winch W1 and the auxiliary hoisting winch W6 through the shackle.

[0014] S10: Simultaneously operate the main hoisting winch W1 to release and the auxiliary hoisting winch W6 to pull back, pull the steel wire rope of the main hoisting winch W1 to the outer sides of the upper and lower pin holes of the hook pulley block of the main boom jib HT, and bypass the connecting joint H9 until the length of the steel wire rope of the main hoisting winch W1 is pulled out to exceed the length of the variable-length auxiliary boom by 10 meters, stop the main hoisting winch W1 release and the auxiliary winch W6 to pull back, and disconnect the shackle connection between the two.

[0015] S11: Use an auxiliary crane to install the luffing jib, lift the lower section LJ2 of the luffing jib and move it to the connecting section H9 and connect it, use an auxiliary crane to connect the first two sections LJ2 and LJ6A of the luffing jib, and place blocks of corresponding height under the first two sections LJ2 and LJ6A of the jib.

[0016] S12: Use the auxiliary crane to place the rear mast Y1 of the luffing jib on the front mast Y2 of the luffing jib, and use the auxiliary crane to lift the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib as a whole, and move them to the tail of the lower boom LJ2 of the luffing jib for connection and fixation.

[0017] S13: Release the auxiliary winch W6 to bypass the crawler crane traction winch wire rope reversing drum device and connect with the auxiliary luffing winch W4, and use the auxiliary winch W6 to guide the wire rope on the auxiliary luffing winch W4 to bypass the outer sides of the upper and lower pin holes of the hook pulley block of the main boom HT.

[0018] S14: Simultaneously operate the auxiliary luffing winch W4 to release and the auxiliary winch W6 to pull back, pull it out to the outside of the upper and lower pin holes of the hook pulley block of the main boom jib HT, bypass the upper boom, until the length of the main lifting winch W1 wire rope exceeds the length of the front mast Y2 of the luffing jib by about 20 meters, stop the auxiliary luffing winch W4 release and the auxiliary winch W6 pull back operation and disconnect the shackle connection between the two.

[0019] S15: Release the auxiliary winch W6 and pull out the auxiliary winch W6 wire rope, and wind it around the pulley block of the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib in the reverse direction according to the rope winding diagram, release the auxiliary luffing winch W4, pull out the auxiliary luffing winch W4 wire rope and connect it with the auxiliary winch W6 wire rope, operate the auxiliary winch W6, and guide the auxiliary luffing winch W4 wire rope to the designated guide pulley by recovering the auxiliary winch W6 wire rope, and then pass it around the pulley block at the top of the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib, and finally guide it to the pulley of the rear mast Y1 of the luffing jib, disconnect the auxiliary winch W6 wire rope, and fix the auxiliary luffing winch W4 wire rope to the auxiliary winch W6 wire rope joint on the pulley block at the top of the rear mast Y1 of the luffing jib.

[0020] S16: Release the wire rope of the main winch W1 and connect it to the wound wire rope of the auxiliary winch W6. Recover the wire rope of the auxiliary winch W6 through on-vehicle operation, guide the wire rope of the main winch W1 to the designated guide pulley on the variable-length jib LJ1, disconnect the wire rope of the auxiliary winch W6, and fix the wire rope of the main winch W1.

[0021] The above-mentioned method for efficiently pulling back an extra-long hoisting wire rope of a crawler crane, further, the middle section arm H6 is 6 meters, the middle section arm H8A is 12 meters, and the middle section arm H8B is 12 meters.

[0022] The present invention changes the process example of LJDB36m main boom assembly listed in the traditional new vehicle test and assembly and disassembly instructions, innovatively uses the internal space of the boom and the upper and lower pin hole space of the hook pulley block of the main boom arm head HT, cooperates with the portable and compact wire rope reversing drum device of the supporting device of the present invention, and makes full use of the auxiliary winch W6 rated power winding function of the crawler crane, and realizes the effective movement and winding of the long-distance wire rope in two times and two stages of displacement. In addition, for the assembly of the tower auxiliary boom of the longer crawler crane, the scheme of the present invention can also be used to realize the effective movement and winding of the longer-distance wire rope in multiple times and multiple stages of displacement.

[0023] The beneficial effects of the present invention are: 1. During the assembly of the extra-long boom of different types of crawler cranes, there is a common problem that the extra-long hoisting wire rope of the crawler crane is difficult to pull back. The present invention is a universal solution to solve the problem of pulling back the extra-long hoisting wire rope of different types of crawler cranes; 2. During the actual assembly operation, the auxiliary winch is used for dragging, but the pressure exceeds the rated pressure, causing the pressure relief valve to open and stop. The present invention adopts a positioning and segmented dragging method to ensure that the auxiliary winch works under the rated pressure and is in normal use; 3. During the actual assembly process, some construction parties use other special equipment resources (such as forklift towing), but due to the high winding ratio and large spacing of the upper and lower mast pulleys of the auxiliary arm, the sliding friction resistance of the wire rope is very large, which can easily cause the deformation of the boom and damage the crawler crane body. The present invention does not require the cooperation of other special equipment resources and can ensure the integrity of the crawler crane body; 4. The supporting device of the present invention is portable and compact and can be installed inside the boom, without any impact on the crawler crane, and does not require additional operating area and on-site space. At the same time, the auxiliary wire rope can be pulled by the winding function to achieve the movement of the dragging wire rope; 5. The present invention saves construction time and costs. The traditional solution is to use the No. 6 auxiliary winch to pull the No. 1 main winch and the No. 4 variable-luffing jib winch wire rope twice and in two short distances. It is necessary to install a pulley block on the main boom head. The pulley block is not used in this working condition and is only used for temporary wire rope guidance. It needs to be removed after the pullback is completed. The traditional solution takes up a lot of manpower, auxiliary cranes, and time resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a side view of the installation steps of the superlift mast of the present invention.

[0025] Figure 2 It is a side view of the installation steps of the superlift mast of the present invention.

[0026] Figure 3 It is a horizontal installation diagram of the reversing roller device of the present invention.

[0027] Figure 4 It is a side view of the installation steps of the variable-length jib of the present invention.

[0028] Figure 5 It is a side view of the connection between the auxiliary luffing winch and the auxiliary winch of the present invention.

[0029] Figure 6 It is a side view of the connection between the main winch and the auxiliary winch of the present invention.

[0030] Figure 7 It is a diagram of a reversing roller device according to the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described in conjunction with the accompanying drawings.

[0032] An efficient method for pulling back the extra-long winch wire rope of a crawler crane, taking the LJDB66m+60m tower jib working condition of SANY SCC4000A crawler crane as an example, includes the following steps: S1: Figure 1As shown in the middle box 1, the superlift mast (D2+D4+D1) is installed. The lower arm D2, the middle arm D4 and the upper arm D1 of the superlift mast (D2+D4+D1) are hoisted and assembled in sequence with slings using an auxiliary crane, and the connecting pins are inserted into the connecting pins to connect them together; S2: Figure 1 As shown in Box 2, adjust the main luffing mast Z to 60°, use the auxiliary crane to lift the entire superlift mast (D2+D4+D1), and install the superlift mast lower boom D2 on the connection hole on the main platform (see Figure 1 Use an auxiliary crane to lift the backpack pulley block (see point d in box 2) on the lower arm D2 of the superlift mast. Figure 1 Move the point f in the middle box 3) to the front end of the upper boom D1 of the superlift mast and fix it with a pin; S3: Figure 1 As shown in the middle box 3, the hydraulic pipeline and electrical circuit of the super hoisting winch W5 are connected so that the super hoisting winch W5 meets the use requirements; S4: Figure 1 As shown in box 4, release the main luffing winch W3, drop the main luffing mast Z forward to 25 degrees, and connect the outer pull plate on the main luffing mast Z with the inner pull plate on the super lifting mast intermediate section D4 with a pin shaft; S5: Figure 2 As shown in the middle box 1, install the pulley block at the top of the superlift mast upper boom D1, release and pass the steel wire rope on the auxiliary luffing winch W4 and the superlifting luffing winch W5, reel in the steel wire rope on the main luffing winch W3, tighten the pull plate between the main luffing mast Z and the superlift mast (D2+D4+D1), and pull up the superlift mast (D2+D4+D1); S6: Figure 2 As shown in Box 2, the installation of the main boom with super lifting mast (H2+H6+H8A+H8A+H8B+H4+H9). Use a sling to connect the lower boom H2 of the main boom to the auxiliary crane, and lift the lower boom H2 of the main boom to the main platform (see Figure 2 As shown in the box 2), then install the 6m intermediate boom H6, the 12m intermediate boom H8A, the 12m intermediate boom H8B, the reducer boom H4, and the connecting boom H9 in sequence; S7: Figure 2 As shown in the middle box 3, release the main luffing winch W3 and the super-lifting luffing winch W5, lower the super-lifting luffing pulley assembly, and connect it with the inner pull plate on the lower boom H2 of the main boom; S8: Figure 3 As shown in , release the wire rope on the main hoisting winch W1, use the auxiliary winch W6 to guide the wire rope of the main hoisting winch W1 to the pulley at the top of the connecting section H9, and install the crawler crane traction winch wire rope reversing drum device horizontally in the upper M and lower pin holes N of the hook head pulley block of the main boom head HT; S9: Figure 3 As shown in the figure, the wire rope connected between the main hoisting winch W1 and the auxiliary hoisting winch W6 through the shackle is disconnected, and the wire rope on the main hoisting winch W1 is guided to pass around the outer sides of the upper and lower pin holes of the hook head pulley block horizontally installed on the main boom boom head HT, and the wire ropes of the main hoisting winch W1 and the auxiliary hoisting winch W6 are reconnected through the shackle; S10: Figure 3 As shown in , operate the main hoisting winch W1 to release and the auxiliary hoisting winch W6 to pull back at the same time, pull the main hoisting winch W1 wire rope to the outside of the upper and lower pin holes of the hook pulley block of the main boom jib HT, bypass the connecting joint H9, until the length of the main hoisting winch W1 wire rope is pulled out to exceed the length of the luffing jib (LJ2+LJ6A+LJ7+LJ7+LJ6B+LJ7+LJ1) by about 10 meters, stop the main hoisting winch W1 release and the auxiliary winch W6 pull back operation, and disconnect the shackle connection between the two; S11: Figure 4 As shown in , use an auxiliary crane to install the luffing jib, lift the lower section LJ2 of the luffing jib and move it to the connection section H9 and connect it, use an auxiliary crane to connect the first two sections LJ2+LJ6A of the luffing jib, and place blocks of corresponding height under the first two sections LJ2+LJ6A of the jib; S12: Figure 4 As shown in the figure, the rear mast Y1 of the luffing jib is placed on the front mast Y2 of the luffing jib by using an auxiliary crane, and the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib are lifted off as a whole by using the auxiliary crane, and moved to the tail of the lower boom LJ2 of the luffing jib for connection and fixing; S13: Figure 5 As shown in the figure, the auxiliary winch W6 is released to bypass the crawler crane traction winch wire rope reversing drum device and connect to the auxiliary luffing winch W4, and the auxiliary winch W6 is used to guide the wire rope on the auxiliary luffing winch W4 to bypass the outer sides of the upper and lower pin holes of the hook pulley block of the main boom HT; S14: Figure 5 As shown in , operate the auxiliary luffing winch W4 to release and the auxiliary winch W6 to pull back at the same time, pull it out to the outside of the upper and lower pin holes of the hook pulley block of the main boom jib HT and bypass the upper boom, until the length of the main hoisting winch W1 wire rope exceeds the length of the front mast Y2 of the luffing jib by about 20 meters, stop the auxiliary luffing winch W4 release and the auxiliary winch W6 pull back operation and disconnect the shackle connection between the two; S15: Figure 6As shown in , release the auxiliary winch W6 and pull out the auxiliary winch W6 wire rope, and wind it around the pulley block of the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib in the reverse direction according to the rope winding diagram, release the auxiliary luffing winch W4, pull out the auxiliary luffing winch W4 wire rope and connect it with the auxiliary winch W6 wire rope, operate the auxiliary winch W6, guide the auxiliary luffing winch W4 wire rope to the designated guide pulley by recovering the auxiliary winch W6 wire rope, and then pass it around the pulley block at the top of the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib, and finally guide it to the pulley of the rear mast Y1 of the luffing jib, disconnect the auxiliary winch W6 wire rope, and fix the auxiliary luffing winch W4 wire rope to the auxiliary winch W6 wire rope joint on the pulley block at the top of the rear mast Y1 of the luffing jib; S16: Figure 6 As shown in the figure, release the wire rope of the main winch W1 and connect it to the wound wire rope of the auxiliary winch W6. Recover the wire rope of the auxiliary winch W6 through on-vehicle operation, guide the wire rope of the main winch W1 to the designated guide pulley on the luffing jib LJ1, disconnect the wire rope of the auxiliary winch W6, and fix the wire rope of the main winch W1.

Claims

1. A method for efficiently pulling back an extra-long hoisting wire rope of a crawler crane, characterized in that: The main arm is 66m long and the auxiliary arm is 60m long. The main arm and auxiliary arm are assembled. The specific operations are as follows: S1, installing the superlift mast, using an auxiliary crane to assemble the lower arm D2, the middle arm D4, and the upper arm D1 of the superlift mast in sequence with slings, and insert the connecting pins and the pins to connect them together to form a superlift mast; S2, adjust the main luffing mast to 60°, use the auxiliary crane to lift the entire superlift mast, install the superlift mast lower boom D2 on the connecting hole of the main platform, and insert the pin, use the auxiliary crane to move the backpack pulley block on the superlift mast lower boom D2 to the front end of the superlift mast upper boom D1, and fix it with the pin; S3: Connect the hydraulic pipeline and electrical circuit of the super hoisting winch W5 to make the super hoisting winch W5 meet the use requirements; S4: Release the main luffing winch W3, drop the main luffing mast Z forward to 25°, and connect the outer pull plate on the main luffing mast Z with the inner pull plate on the superlift mast intermediate section D4 with a pin shaft; S5: Install the pulley block at the top of the superlift mast upper boom D1, release and thread the wire rope on the auxiliary luffing winch W4 and superlift luffing winch W5, reel in the wire rope on the main luffing winch W3, tighten the pull plate between the main luffing mast Z and the superlift mast, and pull up the superlift mast; S6: Installation of the main boom with super lifting mast: Use a sling to connect the lower boom section H2 of the main boom to the auxiliary crane, lift the lower boom section H2 of the main boom and install it to the main platform, and then install the intermediate boom section H6, intermediate boom section H8A, intermediate boom section H8B, reducer boom section H4, and connecting section H9 in sequence; S7: Release the main luffing winch W3 and the super-lifting luffing winch W5, lower the super-lifting luffing pulley assembly, and connect it with the inner pull plate on the lower boom H2 of the main boom; S8: Release the wire rope on the main hoisting winch W1, use the auxiliary winch W6 to guide the wire rope of the main hoisting winch W1 to the pulley at the top of the connecting section H9, and install the crawler crane traction winch wire rope reversing drum device horizontally in the upper M and lower pin holes N of the hook head pulley block of the main boom head HT; S9: Disconnect the wire rope connected between the main hoisting winch W1 and the auxiliary hoisting winch W6 through the shackle, guide the wire rope on the main hoisting winch W1 to pass around the outer sides of the upper and lower pin holes of the hook pulley block horizontally installed on the main boom head HT, and reconnect the wire ropes of the main hoisting winch W1 and the auxiliary hoisting winch W6 through the shackle; S10: Operate the main hoisting winch W1 to release and the auxiliary hoisting winch W6 to pull back at the same time, pull the steel wire rope of the main hoisting winch W1 to the outer side of the upper and lower pin holes of the hook pulley block of the main boom jib HT, and bypass the connecting joint H9, until the length of the steel wire rope of the main hoisting winch W1 is pulled out to exceed the length of the luffing jib by 10 meters, stop the main hoisting winch W1 release and the auxiliary hoisting winch W6 pull back operation, and disconnect the shackle connection between the two; S11: Use the auxiliary crane to install the luffing jib, lift the lower section LJ2 of the luffing jib and move it to the connection section H9 and connect it, use the auxiliary crane to connect the first two sections LJ2 and LJ6A of the luffing jib, and place blocks of corresponding height under the first two sections LJ2 and LJ6A of the jib; S12: Use the auxiliary crane to place the rear mast Y1 of the luffing jib on the front mast Y2 of the luffing jib, and use the auxiliary crane to lift the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib as a whole, and move them to the tail of the lower boom LJ2 of the luffing jib for connection and fixation; S13: release the auxiliary winch W6 to bypass the crawler crane traction winch wire rope reversing drum device and connect with the auxiliary luffing winch W4, and use the auxiliary winch W6 to guide the wire rope on the auxiliary luffing winch W4 to bypass the outer sides of the upper and lower pin holes of the hook pulley block of the main boom HT; S14: Simultaneously operate the auxiliary luffing winch W4 to release and the auxiliary winch W6 to pull back, pull it out to the outside of the upper and lower pin holes of the hook pulley block of the main boom jib HT and bypass the upper boom, until the length of the main hoisting winch W1 wire rope exceeds the length of the front mast Y2 of the luffing jib by about 20 meters, stop the auxiliary luffing winch W4 release and the auxiliary winch W6 pull back operation and disconnect the shackle connection between the two; S15: Release the auxiliary winch W6, pull out the auxiliary winch W6 wire rope, and wind it around the pulley block of the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib in the reverse direction according to the rope winding diagram, release the auxiliary luffing winch W4, pull out the auxiliary luffing winch W4 wire rope and connect it with the auxiliary winch W6 wire rope, operate the auxiliary winch W6, guide the auxiliary luffing winch W4 wire rope to the designated guide pulley by recovering the auxiliary winch W6 wire rope, then pass it around the pulley block at the top of the rear mast Y1 of the luffing jib and the front mast Y2 of the luffing jib, and finally guide it to the pulley of the rear mast Y1 of the luffing jib, disconnect the auxiliary winch W6 wire rope, and fix the auxiliary luffing winch W4 wire rope to the auxiliary winch W6 wire rope joint on the pulley block at the top of the rear mast Y1 of the luffing jib; S16: Release the wire rope of the main winch W1 and connect it to the wound wire rope of the auxiliary winch W6. Recover the wire rope of the auxiliary winch W6 through on-vehicle operation, guide the wire rope of the main winch W1 to the designated guide pulley on the variable-length jib LJ1, disconnect the wire rope of the auxiliary winch W6, and fix the wire rope of the main winch W1.

2. The method for efficiently pulling back the extra-long hoisting wire rope of a crawler crane according to claim 1 is characterized in that: The intermediate boom H6 is 6 meters, the intermediate boom H8A is 12 meters, and the intermediate boom H8B is 12 meters.

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