Method for replacing luffing cylinder of luffing tower crane and luffing tower crane

Abstract

A method for replacing a luffing cylinder of a luffing tower crane and the luffing tower crane, the method comprising: using an auxiliary hoisting device on the luffing tower crane to hoist a luffing cylinder to be removed, and removing the luffing cylinder to be removed; using the auxiliary hoisting device on the luffing tower crane to pass the luffing cylinder to be removed out to the bottom of the boom; using a hoisting mechanism of the luffing tower crane to lower the luffing cylinder to be removed to the ground; using the hoisting mechanism of the luffing tower crane to lift a luffing cylinder to be installed below the boom; using the auxiliary hoisting device on the luffing tower crane to pass the luffing cylinder to be installed into the boom; using the auxiliary hoisting device on the luffing tower crane to hoist the luffing cylinder to be installed, and installing the luffing cylinder to be installed to the luffing tower crane. In the embodiment of the present application, the luffing cylinder can be directly disassembled and assembled, which is convenient, time-saving and labor-saving, and does not need to use additional hoisting equipment, thereby saving cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, in particular to a luffing cylinder replacement method of a luffing tower crane and the luffing tower crane. BACKGROUND

[0002] The luffing cylinder luffing tower crane is a new type of luffing tower crane, which is driven by a luffing cylinder to realize luffing action of a lifting arm. Compared with the traditional luffing tower crane, it has more advantages in space utilization and cost. At present, when the luffing cylinder needs to be replaced due to failure or reaching the service life, the tower body needs to be first lowered to a height that can be hoisted by other hoisting equipment (including truck cranes, crawler cranes, etc.), then the connecting pin shaft between the head part of the lifting arm and the standard section is removed, then the entire head part is hoisted and placed on the prepared support on the ground, then the luffing cylinder is replaced on the ground with the help of other equipment, and finally the head part is installed back to the tower body. However, this luffing cylinder replacement method has the following defects: 1. The process is complicated and needs to be disassembled and hoisted; 2. The space occupation is large and the site is severely limited; 3. The replacement process is time-consuming and affects the construction progress; and 4. Other hoisting equipment is needed for assistance, which is not economical. SUMMARY

[0003] Therefore, the present application aims to provide a luffing cylinder replacement method of a luffing tower crane, which is convenient to disassemble and assemble, saves time and labor, and does not need the assistance of other hoisting equipment.

[0004] To achieve the above-mentioned purpose, the present application provides a luffing cylinder replacement method of a luffing tower crane for replacing the luffing cylinder of the luffing tower crane, wherein the luffing tower crane comprises a tower body, a lifting arm and a luffing cylinder, one end of the luffing cylinder is connected to the tower body, and the other end is connected to the lifting arm, and the luffing cylinder replacement method of the luffing tower crane comprises the following steps:

[0005] Using an auxiliary hoisting device on the luffing tower crane to hoist the luffing cylinder to be disassembled, and disassembling the luffing cylinder to be disassembled;

[0006] Using the auxiliary hoisting device on the luffing tower crane to pass the luffing cylinder to be disassembled out to the bottom of the lifting arm;

[0007] Using the hoisting mechanism of the luffing tower crane to lower the luffing cylinder to be disassembled to the ground;

[0008] Using the hoisting mechanism of the luffing tower crane to lift the luffing cylinder to be installed below the lifting arm;

[0009] Using the auxiliary hoisting device on the luffing tower crane to pass the luffing cylinder to be installed into the lifting arm;

[0010] The auxiliary hoisting device on the mobile boom tower crane is used to hoist the jib cylinder to be installed, and the jib cylinder to be installed is installed to the mobile boom tower crane.

[0011] Optionally, the jib cylinder replacement method of the mobile boom tower crane further comprises the step of removing the jib cylinder: controlling the jib to an initial state, and removing the locking device for supporting the jib.

[0012] Optionally, the jib comprises an upper chord, a lower chord, a side web, a bottom straight web and a bottom inclined web, the upper chord is provided with a lifting lug for mounting the auxiliary hoisting device, two bottom inclined webs in the shape of an "eight" are arranged between two bottom straight webs, thereby forming a triangular hollow at the bottom of the jib to allow the jib cylinder to pass out or pass in; when the jib cylinder passes out of the bottom of the jib or passes into the jib, the jib cylinder passes out of or passes into between the bottom inclined webs in the shape of an "eight";

[0013] The jib cylinder replacement method of the mobile boom tower crane further comprises the step of removing the jib cylinder before removing the jib cylinder: removing the walkway at the corresponding position of the bottom inclined web in the shape of an "eight".

[0014] Optionally, the auxiliary hoisting device comprises a first auxiliary hoisting device, a second auxiliary hoisting device and a third auxiliary hoisting device; the step of using the auxiliary hoisting device on the mobile boom tower crane to hoist the jib cylinder to be removed, and removing the jib cylinder to be removed comprises:

[0015] The first end of the jib cylinder is hoisted by the first auxiliary hoisting device, and then the pin shaft of the first end of the jib cylinder is removed;

[0016] The first end of the jib cylinder is hoisted by the first auxiliary hoisting device, the second end of the jib cylinder is hoisted by the second auxiliary hoisting device, and then the pin shaft of the second end of the jib cylinder is removed, the first end and the second end are oppositely arranged;

[0017] The jib cylinder is placed on the tug wheel frame of the jib by the first auxiliary hoisting device and the second auxiliary hoisting device.

[0018] Optionally, the step of using the auxiliary hoisting device on the mobile boom tower crane to pass the jib cylinder to be removed out to the bottom of the jib comprises:

[0019] The first end of the variable amplitude oil cylinder is hoisted to an inclined state with an angle higher than the second end by using the first auxiliary hoisting device and the second auxiliary hoisting device to hoist the first end of the variable amplitude oil cylinder and using the third auxiliary hoisting device to hoist the second end of the variable amplitude oil cylinder.

[0020] The first auxiliary hoisting device is loosened, and the variable amplitude oil cylinder is pulled out to the bottom of the crane boom by using the second auxiliary hoisting device and the third auxiliary hoisting device.

[0021] Optionally, the auxiliary hoisting device includes a first auxiliary hoisting device, a second auxiliary hoisting device and a third auxiliary hoisting device; and the step of using the auxiliary hoisting device on the mobile boom tower crane to pull the variable amplitude oil cylinder to be installed into the crane boom includes:

[0022] The two ends of the variable amplitude oil cylinder are hoisted by using the second auxiliary hoisting device and the third auxiliary hoisting device, so that the variable amplitude oil cylinder to be installed is pulled into the crane boom.

[0023] The two ends of the variable amplitude oil cylinder are hoisted by using the first auxiliary hoisting device, the second auxiliary hoisting device and the third auxiliary hoisting device, so that the variable amplitude oil cylinder is placed on the drag pulley frame of the crane boom.

[0024] Optionally, the step of using the auxiliary hoisting device on the mobile boom tower crane to hoist the variable amplitude oil cylinder to be installed and installing the variable amplitude oil cylinder to be installed on the mobile boom tower crane includes:

[0025] The position close to the first end of the variable amplitude oil cylinder is hoisted by using the first auxiliary hoisting device, the position close to the second end of the variable amplitude oil cylinder is hoisted by using the second auxiliary hoisting device, and then the pin shaft of the second end is installed, and the first end and the second end are oppositely arranged.

[0026] The second auxiliary hoisting device is loosened, the position close to the first end of the variable amplitude oil cylinder is hoisted by using the first auxiliary hoisting device, and then the pin shaft of the first end of the variable amplitude oil cylinder is installed.

[0027] Optionally, the first auxiliary hoisting device, the second auxiliary hoisting device and the third auxiliary hoisting device are arranged in sequence in the direction from the arm root connected to the tower body to the arm tail of the crane boom.

[0028] The application further provides a luffing cylinder replacement method for a luffing cylinder of a luffing-jib tower crane.

[0029] Optionally, one end of the bottom inclined web of the "8" shape is connected to one of the lower chords, and the other end is connected to one of the bottom straight webs; or,

[0030] In the direction from the arm root of the luffing jib to the arm tail, the first auxiliary lifting device, the second auxiliary lifting device and the third auxiliary lifting device are arranged in sequence, the luffing jib is provided with a tug wheel frame on the lower chord, the tug wheel frame is closer to the arm root of the luffing jib than the triangular hollow, and the tug wheel frame and the triangular hollow are both below the first auxiliary lifting device, the second auxiliary lifting device and the third auxiliary lifting device.

[0031] In the application, the luffing cylinder can be directly disassembled and assembled without disassembling the entire upper part of the luffing-jib tower crane, so that the disassembly and assembly are convenient, time-saving and labor-saving, the replacement of the luffing cylinder can be completed by using the auxiliary lifting device and the lifting mechanism of the luffing-jib tower crane itself without the help of additional hoisting equipment, and the cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0033] Figure 1 The front view of part of the luffing jib of the luffing-jib tower crane is provided for an embodiment of the application.

[0034] Figure 2 The bottom view of part of the luffing jib of the luffing-jib tower crane is provided for an embodiment of the application. Figure 1

[0035] Figure 3 The flowchart of the luffing cylinder replacement method of the luffing-jib tower crane is provided for an embodiment of the application.

[0036] Figure 4 The flowchart of the luffing cylinder replacement method of the luffing-jib tower crane is provided for an embodiment of the application.​Figure 3 The structure diagram after the pin shaft of the first end is removed in step S11 of the boom tower crane luffing cylinder replacement method.

[0037] Figure 5 For Figure 3 The structure diagram after the pin shaft of the second end is removed in step S11 of the boom tower crane luffing cylinder replacement method.

[0038] Figure 6 For Figure 3 The structure diagram when the luffing cylinder is tilted in step S13 of the boom tower crane luffing cylinder replacement method.

[0039] Figure 7 For Figure 3 The structure diagram when the luffing cylinder is pulled out of the boom in step S11 of the boom tower crane luffing cylinder replacement method. DETAILED DESCRIPTION

[0040] Specific embodiments of the present application will be described in detail with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the description of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

[0041] In the description of the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0042] The terms "first", "second", "third" and the like are only used to distinguish similar attributes of values or elements, and do not indicate or imply relative importance or a specific order.

[0043] The term "including", "containing" or any other variant thereof is intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0044] The embodiment of the present application provides a boom tower crane luffing cylinder replacement method, which is used for replacing a luffing cylinder of a boom tower crane. Please refer to Figure 1 and Figure 2 The boom tower crane includes a tower body, a boom 11 and a luffing cylinder 13 (see Figure 4), the hoisting arm 11 comprises an upper chord 111, a lower chord 113, a side web 114, a bottom straight web 115 and a bottom inclined web 117. The upper chord 111 is provided with lifting lugs 1111, and two bottom inclined webs 117 in the shape of an "8" are arranged between the two bottom straight webs 115, thereby forming a triangular hollow at the bottom of the hoisting arm 11 to allow the luffing cylinder 13 to pass out or pass in. Specifically, one end of the bottom inclined web 117 in the shape of an "8" is connected to one of the lower chords 113, and the other end is connected to one of the bottom straight webs 115. One end of the luffing cylinder 13 is connected to the tower body, and the other end is connected to the hoisting arm 11.

[0045] Please refer to Figure 3 The luffing cylinder replacement method of the embodiment of the mobile-boom tower crane comprises the following steps:

[0046] S11, using the auxiliary lifting device on the mobile-boom tower crane to hoist the luffing cylinder 13 to be removed, and removing the luffing cylinder 13 to be removed. Specifically, the auxiliary lifting device on the mobile-boom tower crane can be a hoist provided on the hoisting arm 11, and the lifting lugs 1111 on the hoisting arm 11 can provide a lifting point for the hoist.

[0047] S13, using the auxiliary lifting device on the mobile-boom tower crane to pass the luffing cylinder 13 to be removed out to the bottom of the hoisting arm 11. Specifically, the luffing cylinder 13 is passed out from between the bottom inclined webs 117 in the shape of an "8" to the bottom of the hoisting arm 11.

[0048] S15, using the hoisting mechanism of the mobile-boom tower crane to lower the luffing cylinder 13 to be removed to the ground. Specifically, the hoisting mechanism of the mobile-boom tower crane is the hoisting mechanism for lifting heavy objects when the mobile-boom tower crane is working, and the hoisting mechanism of the mobile-boom tower crane is relatively long and can lower the luffing cylinder 13 from below the hoisting arm 11 extended to a high place to the ground.

[0049] S17, using the hoisting mechanism of the mobile-boom tower crane to lift the luffing cylinder 13 to be installed to the bottom of the hoisting arm 11.

[0050] S19, using the auxiliary lifting device on the mobile-boom tower crane to pass the luffing cylinder 13 to be installed into the hoisting arm 11. Specifically, the luffing cylinder 13 to be installed is passed in from between the bottom inclined webs 117 in the shape of an "8" to between the inclined webs 114 of the hoisting arm 11.

[0051] S21, using the auxiliary lifting device on the mobile-boom tower crane to hoist the luffing cylinder 13 to be installed, and installing the luffing cylinder 13 to be installed to the mobile-boom tower crane.

[0052] The boom tower crane amplitude cylinder replacement method of the embodiment can directly disassemble and assemble the amplitude cylinder without disassembling the entire upper part of the boom tower crane, thus being convenient to disassemble and assemble, saving time and labor, and replacing the amplitude cylinder by using the auxiliary lifting device and the lifting mechanism of the boom tower crane itself without the need of additional hoisting equipment, thus saving cost.

[0053] In the embodiment, the boom tower crane amplitude cylinder replacement method further comprises the step before step S11:

[0054] S10, please refer to Figure 4 , control the boom 11 to the initial state, and remove the locking device for supporting the boom 11. Specifically, the initial state of the boom 11 generally refers to the state when the boom 11 is horizontal, which is also the lowest position of the boom 11 (the boom 11 cannot continue to rotate downward). When the boom 11 is in the initial state, even if the locking device is removed, the boom 11 can remain in the original state without falling down.

[0055] Specifically, step S10 further comprises removing the walkway at the corresponding position of the "8" shaped bottom inclined web 117. In this way, space is provided for the amplitude cylinder 13 to pass out of or into the boom 11.

[0056] In the embodiment, the auxiliary lifting device comprises a first auxiliary lifting device 151, a second auxiliary lifting device 152 and a third auxiliary lifting device 153, and step S11 specifically comprises:

[0057] S111, please refer to Figure 4 , the first end of the amplitude cylinder 13 is hoisted by the first auxiliary lifting device 151, and then the pin shaft at the first end of the amplitude cylinder 13 is removed. Specifically, the pin shaft at the cylinder end of the amplitude cylinder 13 can be removed in step S111. Specifically, the first auxiliary lifting device 151 is used to hoist the position between the middle part and the first end of the cylinder of the amplitude cylinder 13.

[0058] S113, please refer to Figure 5 , the first end of the amplitude cylinder 13 is hoisted by the first auxiliary lifting device 151, the second end of the amplitude cylinder 13 is hoisted by the second auxiliary lifting device 152, and then the pin shaft at the second end opposite to the first end of the amplitude cylinder 13 is removed. Specifically, the pin shaft at the piston end of the amplitude cylinder 13 can be removed in step S113. The second auxiliary lifting device 152 is used to hoist the position between the middle part and the second end of the cylinder of the amplitude cylinder 13. It can be understood that the pin shaft at the piston end can also be removed first, and then the pin shaft at the cylinder end is removed, but it is more convenient to remove the pin shaft at the cylinder end first.

[0059] S115, using the first auxiliary lifting device 151 and the second auxiliary lifting device 152, the luffing cylinder 13 is placed on the towing frame 119 of the lifting boom 11.

[0060] In this embodiment, step S13 specifically includes:

[0061] S131, please refer to Figure 6 The first end of the luffing cylinder 13 (e.g., the pin hole at the cylinder end of the luffing cylinder) is lifted by the first auxiliary lifting device 151 and the second auxiliary lifting device 152, and the second end of the luffing cylinder 13 (e.g., the pin hole at the piston end of the luffing cylinder) is lifted by the third auxiliary lifting device 153, so that the first end of the luffing cylinder 13 is lifted to a state of inclination at a certain angle higher than the second end.

[0062] S133, please refer to Figure 7 Release the first auxiliary lifting device 151, and use the second auxiliary lifting device 152 and the third auxiliary lifting device 153 to pass the luffing cylinder 13 through the triangular hole between the "eight"-shaped bottom inclined web members 117.

[0063] Specifically, from the base of the boom 11 connected to the tower body to the tail of the boom, the first auxiliary lifting device 151, the second auxiliary lifting device 152, and the third auxiliary lifting device 153 are arranged sequentially. Specifically, the towing frame 119 is located on the lower main chord 113 of the boom 11 and protrudes towards the inside of the boom 11. The towing frame 119 is used to support the luffing cylinder 13 whose end pins have been removed, or the luffing cylinder 13 that has been lifted from the ground and is ready for installation. The towing frame 119 is closer to the base of the boom 11 than the triangular opening between the "eight"-shaped bottom inclined web members 117. The first auxiliary lifting device 151, the second auxiliary lifting device 152, and the third auxiliary lifting device 153 are all located on one side of the upper main chord 111, so that the triangular cavity formed by the towing frame 119 and the "eight"-shaped bottom inclined web member 117 is located below the first auxiliary lifting device 151, the second auxiliary lifting device 152, and the third auxiliary lifting device 153.

[0064] In this embodiment, step S19 specifically includes:

[0065] S191, the two ends of the luffing cylinder 13 (e.g., the pin holes of the luffing cylinder) are respectively lifted by the second auxiliary lifting device 152 and the third auxiliary lifting device 153, so that the luffing cylinder 13 to be installed is inserted into the lifting arm 11. Specifically, the second auxiliary lifting device 152 can be hung in the pin hole at the cylinder end of the luffing cylinder 13, and the third auxiliary lifting device 153 can be hung in the pin hole at the piston end of the luffing cylinder 13.

[0066] S193, the first auxiliary lifting device 151, the second auxiliary lifting device 152, and the third auxiliary lifting device 153 are used to suspend both ends of the luffing cylinder 13 (e.g., at the pin holes of the luffing cylinder) to place the luffing cylinder 13 on the towing wheel frame of the lifting boom 11. Specifically, the first auxiliary lifting device 151 and the second auxiliary lifting device 152 can be hung in the pin holes at the cylinder end of the luffing cylinder 13, and the third auxiliary lifting device 153 can be hung in the pin hole at the piston end of the luffing cylinder 13.

[0067] In this embodiment, step S21 specifically includes:

[0068] S211, the luffing cylinder 13 is suspended near its first end using the first auxiliary lifting device 151, and near its second end using the second auxiliary lifting device 152. Then, the pin at the second end of the luffing cylinder 13 is installed. Specifically, the first auxiliary lifting device 151 is used to suspend the luffing cylinder 13 between the middle of its cylinder barrel and the first end, and the second auxiliary lifting device 152 is used to suspend the luffing cylinder 13 between the middle of its cylinder barrel and the second end.

[0069] S213, release the second auxiliary lifting device 152, use the first auxiliary lifting device 151 to lift the luffing cylinder 13 at the position near the first end of the luffing cylinder 13, and then install the pin at the first end of the luffing cylinder 13.

[0070] This invention also provides a luffing tower crane that uses the above-described luffing cylinder replacement method for replacing the luffing cylinder. The luffing tower crane includes a jib 11 and a luffing cylinder 13. The jib 11 includes an upper main chord 111, a lower main chord 113, side web members 114, bottom straight web members 115, and bottom inclined web members 117. A lifting lug 1111 is provided on the upper main chord 111, and an auxiliary lifting device is installed on the lifting lug 1111. Two bottom inclined web members 117 arranged in a "V" shape are provided between the two bottom straight web members 115, thereby forming a triangular cavity at the bottom of the jib 11 to allow the luffing cylinder 13 to pass through. One end of the luffing cylinder 13 is connected to the tower body, and the other end is connected to the jib 11.

[0071] In this embodiment, one end of the bottom inclined web member 117, which is shaped like the number "8", is connected to one of the lower main chords 113, and the other end is connected to a bottom straight web member 115.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for replacing the luffing cylinder of a luffing tower crane, used for replacing the luffing cylinder of a luffing tower crane, the luffing tower crane including a tower body, a jib (11) and a luffing cylinder (13), one end of the luffing cylinder (13) being connected to the tower body and the other end being connected to the jib (11), characterized in that, The method for replacing the luffing cylinder of the tower crane includes: The luffing cylinder (13) to be removed is lifted using the auxiliary lifting device on the luffing tower crane, and then removed. The auxiliary lifting device includes a first auxiliary lifting device (151), a second auxiliary lifting device (152), and a third auxiliary lifting device (153). The first auxiliary lifting device (151) is used to lift the luffing cylinder (13) near its first end, and then the pin at the first end of the luffing cylinder (13) is removed. (151) Lift the luffing cylinder (13) at the position near the first end of the luffing cylinder (13), and use the second auxiliary lifting device (152) to lift the luffing cylinder (13) at the position near the second end of the luffing cylinder (13). Then remove the pin of the second end of the luffing cylinder (13), with the first end and the second end facing each other. Use the first auxiliary lifting device (151) and the second auxiliary lifting device (152) to place the luffing cylinder (13) on the towing frame of the boom (11). Using the auxiliary lifting device on the luffing tower crane, the luffing cylinder (13) to be removed is pushed through to the bottom of the boom (11); The luffing cylinder (13) to be removed is lowered to the ground using the hoisting mechanism of the luffing tower crane; The luffing cylinder (13) to be installed is lifted to below the boom (11) using the hoisting mechanism of the luffing tower crane; The luffing cylinder (13) to be installed is inserted into the boom (11) using the auxiliary lifting device on the luffing tower crane; The luffing cylinder (13) to be installed is lifted by the auxiliary lifting device on the luffing tower crane and then installed onto the luffing tower crane.

2. The method for replacing the luffing cylinder of a tower crane as described in claim 1, characterized in that, The luffing tower crane luffing cylinder replacement method also includes the following steps before removing the luffing cylinder (13): controlling the boom (11) to the initial state and removing the locking device used to support the boom (11).

3. The method for replacing the luffing cylinder of a tower crane as described in claim 1, characterized in that, The lifting boom (11) includes an upper main chord (111), a lower main chord (113), side web members (114), bottom straight web members (115), and bottom inclined web members (117). The upper main chord (111) is provided with a lifting lug (1111) for installing the auxiliary lifting device. Two bottom inclined web members (117) in a figure-eight shape are provided between the two bottom straight web members (115), thereby forming a triangular cavity at the bottom of the lifting boom (11) to allow the luffing cylinder (13) to pass through or into the boom. When the luffing cylinder (13) passes through the bottom of the lifting boom (11) or enters the lifting boom (11), the luffing cylinder (13) passes through or into the bottom inclined web members (117) in a figure-eight shape. The luffing tower crane luffing cylinder replacement method also includes the following steps before removing the luffing cylinder (13): removing the walkway at the corresponding position of the bottom inclined web member (117) in the "eight" shape.

4. The method for replacing the luffing cylinder of a tower crane as described in claim 1, characterized in that, The step of using the auxiliary lifting device on the luffing tower crane to pass the luffing cylinder (13) to be removed through to the bottom of the boom (11) specifically includes: The first end of the luffing cylinder (13) is lifted by the first auxiliary lifting device (151) and the second auxiliary lifting device (152), and the second end of the luffing cylinder (13) is lifted by the third auxiliary lifting device (153). The first end of the luffing cylinder (13) is lifted to a state of inclination at a certain angle higher than the second end. Release the first auxiliary lifting device (151), and use the second auxiliary lifting device (152) and the third auxiliary lifting device (153) to push the luffing cylinder (13) through to the bottom of the boom (11).

5. The method for replacing the luffing cylinder of a tower crane as described in claim 1, characterized in that, The step of inserting the luffing cylinder (13) to be installed into the boom (11) using the auxiliary lifting device on the luffing tower crane specifically includes: The two ends of the luffing cylinder (13) are respectively lifted by the second auxiliary lifting device (152) and the third auxiliary lifting device (153) so that the luffing cylinder (13) to be installed is inserted into the lifting arm (11); The first auxiliary lifting device (151), the second auxiliary lifting device (152) and the third auxiliary lifting device (153) are used to lift the two ends of the luffing cylinder (13) respectively, so as to place the luffing cylinder (13) on the towing frame of the lifting arm (11).

6. The method for replacing the luffing cylinder of a tower crane as described in claim 5, characterized in that, The steps of using the auxiliary lifting device on the luffing tower crane to lift the luffing cylinder (13) to be installed and installing the luffing cylinder (13) to be installed on the luffing tower crane specifically include: The first auxiliary lifting device (151) is used to lift the luffing cylinder (13) at the first end near the luffing cylinder (13), and the second auxiliary lifting device (152) is used to lift the luffing cylinder (13) at the second end near the luffing cylinder (13). Then the pin of the second end is installed, with the first end and the second end arranged opposite to each other. Release the second auxiliary lifting device (152), use the first auxiliary lifting device (151) to lift the luffing cylinder (13) near the first end, and then install the pin at the first end of the luffing cylinder (13).

7. The method for replacing the luffing cylinder of a tower crane as described in claim 1 or 5, characterized in that, In the direction from the root of the boom (11) connected to the tower body to the tail of the boom, the first auxiliary lifting device (151), the second auxiliary lifting device (152) and the third auxiliary lifting device (153) are arranged in sequence.

8. A luffing tower crane that uses the luffing cylinder replacement method as described in any one of claims 1-7 to replace the luffing cylinder, characterized in that, The luffing tower crane includes a lifting jib (11) and a luffing cylinder (13). The lifting jib (11) includes an upper main chord (111), a lower main chord (113), side web members (114), bottom straight web members (115), and bottom inclined web members (117). The upper main chord (111) is provided with a lifting lug (1111), and an auxiliary lifting device is installed on the lifting lug (1111). Two bottom inclined web members (117) in the shape of an "eight" are provided between the two bottom straight web members (115), thereby forming a triangular cavity at the bottom of the lifting jib (11). One end of the luffing cylinder (13) is connected to the tower body, and the other end is connected to the lifting jib (11).

9. The luffing jib tower crane as described in claim 8, characterized in that, One end of the figure-eight shaped bottom oblique web member (117) is connected to one of the lower main chords (113), and the other end is connected to one of the bottom straight web members (115); or, In the direction from the root of the boom (11) connected to the tower body to the tail of the boom, the first auxiliary lifting device (151), the second auxiliary lifting device (152) and the third auxiliary lifting device (153) are arranged in sequence. A towing frame (119) is provided on the lower main chord (113) of the boom (11). The towing frame (119) is closer to the root of the boom (11) than the triangular cavity. The towing frame (119) and the triangular cavity are both located below the first auxiliary lifting device (151), the second auxiliary lifting device (152) and the third auxiliary lifting device (153).

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