CN112811329A - Crane auxiliary arm installation method and crane - Google Patents
Crane auxiliary arm installation method and crane Download PDFInfo
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- CN112811329A CN112811329A CN202110159111.7A CN202110159111A CN112811329A CN 112811329 A CN112811329 A CN 112811329A CN 202110159111 A CN202110159111 A CN 202110159111A CN 112811329 A CN112811329 A CN 112811329A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/66—Outer or upper end constructions
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Abstract
The invention provides a crane auxiliary arm installation method and a crane, wherein the method comprises the following steps: the arm head of the main arm is rotatably connected with the arm tail of the auxiliary arm, the arm tail of the auxiliary arm is rotatably connected with the tail end of the auxiliary arm supporting rod, and the auxiliary arm is connected with the auxiliary arm supporting rod through a first pulling plate component; the free end of the main lifting rope penetrates through a first guide wheel assembly on the auxiliary arm supporting rod and is connected with the auxiliary arm supporting rod, the auxiliary arm supporting rod is lifted, and the auxiliary arm supporting rod is driven to rotate to a position of a first preset angle relative to the auxiliary arm along a first rotation direction; the main lifting rope is tightened, the auxiliary arm supporting rod is driven to rotate to a position of a second preset angle relative to the auxiliary arm along the first rotation direction, and the first pulling plate assembly is converted into a linear state from a free extension state; the free end of the main hoisting rope is disassembled from the supporting rod of the fly jib and passes through the second guide wheel assembly on the jib head of the fly jib. The invention is convenient for the rope threading operation of the main lifting rope, greatly simplifies the installation procedure of the auxiliary arm, reduces the difficulty of installation operation and improves the installation efficiency.
Description
Technical Field
The invention relates to the technical field of cranes, in particular to a crane auxiliary arm installation method and a crane.
Background
The crane is widely applied in the technical field of engineering machinery, and the crane lifts heavy objects through the suspension arm and the steel wire rope wound on the arm head of the suspension arm. Based on the difference of the hoisting requirements, in order to improve the hoisting height and the working amplitude of the crane, the boom of the crane is usually arranged as a main boom and an auxiliary boom. Due to the limitations of loading size and transportation weight, the crane often needs to be disassembled before and after operation.
As shown in fig. 1, when the auxiliary jib of the crane is installed, the auxiliary jib 2 is lifted to one side of the main jib 1 of the crane by the auxiliary crane 4, the jib head of the main jib 1 is hinged with the jib tail of the auxiliary jib 2, the tail end of the auxiliary jib support rod 3 is hinged with the jib tail of the auxiliary jib 2, and meanwhile, a first pull rope 5 and a second pull rope 6 are arranged on the auxiliary jib support rod 3; then, the auxiliary jib supporting rod 3 is hoisted by an auxiliary crane 4 through a first pull rope 5, so that the auxiliary jib supporting rod 3 and the auxiliary jib 2 form a preset included angle; then, connecting the second pull rope 6 with a main lifting rope 7 of the crane, putting down the first pull rope 5, and fixing the first pull rope on a lock lug of the auxiliary arm support rod 3; tightening the main lifting rope 7 through winding, pulling the auxiliary arm supporting rod 3 to one side of the main arm 1, and connecting an auxiliary arm pulling plate on the side of the main arm; then, the main lifting rope 7 is loosened, so that the auxiliary arm pulling plate on the main arm side and the auxiliary arm pulling plate on the auxiliary arm side reach stress balance; then, the second pull rope 6 is disassembled from the main lifting rope 7, and then the second pull rope 6 is fixed on the lock lug of the auxiliary arm 2; and finally, sequentially penetrating the head end of the main lifting rope 7 through a first guide wheel assembly on the fly jib supporting rod 3 and a second guide wheel assembly at the head end of the fly jib 2, and connecting the head ends of the main lifting rope and the second guide wheel assembly with a lifting hook of a crane. Thereby, the attachment of the jib of the crane is completed.
However, since a plurality of pulling ropes for assisting the lifting are required in the process of lifting the sub-boom support rod, it takes a lot of time to detach the pulling ropes. Meanwhile, after the auxiliary arm supporting rod is lifted in place, certain operation difficulty and construction safety risk exist in the rope threading operation of the main lifting rope, and the rope threading efficiency is low. In this way, in actual operation, the above-described mounting operation of the sub-arm is extremely troublesome, and the mounting efficiency is low.
Disclosure of Invention
The invention provides a crane jib installation method and a crane, which are used for solving the problems of complex operation and low efficiency of the existing installation mode of the jib.
The invention provides a crane auxiliary arm installation method, which comprises the following steps: s1, rotatably connecting the arm head of the main arm with the arm tail of the auxiliary arm, rotatably connecting the arm tail of the auxiliary arm with the tail end of an auxiliary arm supporting rod, connecting the auxiliary arm with the auxiliary arm supporting rod through a first pulling plate component, and removing a first locking structure on the first pulling plate component to enable the first pulling plate component to be in a freely extending state; s2, enabling the free end of the main lifting rope to penetrate through the first guide wheel assembly on the auxiliary arm supporting rod and be connected with the auxiliary arm supporting rod, hoisting the auxiliary arm supporting rod, and driving the auxiliary arm supporting rod to rotate to a position of a first preset angle relative to the auxiliary arm along a first rotation direction; s3, tightening the main lifting rope, driving the auxiliary arm supporting rod to rotate relative to the auxiliary arm to a position of a second preset angle along the first rotation direction continuously, so that the first pulling plate assembly is converted into a linear state from a free stretching state, and mounting the first locking structure on the first pulling plate assembly, so that the first pulling plate assembly keeps the linear state; and S4, disassembling the free end of the main lifting rope from the supporting rod of the auxiliary arm, and penetrating the free end of the main lifting rope through a second guide wheel assembly on the arm head of the auxiliary arm.
According to the method for installing the auxiliary jib of the crane provided by the invention, in S2, the hoisting of the auxiliary jib supporting rod comprises the following steps: connecting the head end of the auxiliary arm supporting rod with one end of a first pull rope, connecting the other end of the first pull rope with a lifting hook of an auxiliary crane, and controlling the lifting hook of the auxiliary crane to be lifted vertically upwards; accordingly, in S3, before the main hoisting rope is tightened, the method further includes the following steps: and separating the other end of the first pull rope from the lifting hook of the auxiliary crane, and fixing the first pull rope on the lock lug of the auxiliary arm support rod.
According to the installation method of the crane jib, the first preset angle alpha is 30-80 degrees, and the second preset angle beta is determined by the length of the first pulling plate component in a straight line state.
According to the method for installing the fly jib of the crane provided by the invention, the step of enabling the free end of the main lifting rope to pass through the first guide pulley assembly on the fly jib supporting rod and be connected with the fly jib supporting rod in the step S2 comprises the following steps: and a quick-release joint is arranged at a position, close to the tail end of the auxiliary arm supporting rod, on the auxiliary arm supporting rod, and the free end of the main lifting rope penetrates through the first guide wheel assembly on the auxiliary arm supporting rod and then is connected with the quick-release joint.
According to the installation method of the crane auxiliary arm, provided by the invention, the quick-release connector comprises any one of an eyebolt, a hook, a locking crane and a clamp.
According to the crane jib installation method provided by the invention, in S3, before the tightening the main hoisting rope, the method further comprises: and releasing the hoisting operation of the auxiliary arm supporting rod.
According to the installation method of the crane auxiliary arm, provided by the invention, between S3 and S4, the method further comprises the following steps: connecting the main arm with the auxiliary arm supporting rod through a second pulling plate assembly, and removing a second locking structure on the second pulling plate assembly to enable the second pulling plate assembly to be in a free extension state; loosening the main lifting rope to enable the auxiliary arm to rotate in a second rotating direction relative to the main arm under the action of self gravity until the second pulling plate assembly is converted into a linear state from a freely stretching state, and installing the second locking structure on the second pulling plate assembly to enable the second pulling plate assembly to keep the linear state; wherein the second rotation direction is opposite to the first rotation direction.
According to the installation method of the crane jib, the first pulling plate assembly and the second pulling plate assembly are identical in structure and respectively comprise a plurality of pulling plates which are sequentially connected; the first locking structure and the second locking structure have the same structure and respectively comprise a locking plate, a first locking pin and a second locking pin; one end of the locking plate is connected with the first locking pin, and the other end of the locking plate is connected with the second locking pin; under the condition that the first pulling plate assembly or the second pulling plate assembly is in a linear state, the first locking pin and the second locking pin are respectively inserted into two adjacent pulling plates.
According to the crane jib installation method provided by the invention, before S1, the method further comprises the following steps: assembling the main arm, and placing the assembled main arm on the ground; and hoisting the auxiliary boom by adopting an auxiliary crane, and placing the auxiliary boom at one side of the main boom, so that the boom head of the main boom is opposite to the boom tail of the auxiliary boom, and the main boom and the auxiliary boom are distributed on the same straight line.
According to the method for installing the auxiliary jib of the crane, in S1, the jib head of the main jib is rotatably connected with the jib tail of the auxiliary jib through a pin shaft, and the jib tail of the auxiliary jib is rotatably connected with the tail end of the auxiliary jib supporting rod through a pin shaft.
The present invention also provides a crane comprising: a main jib and an auxiliary jib, which is mounted on the main jib by the crane auxiliary jib mounting method.
The invention provides a crane jib installation method and a crane.A free end of a main lifting rope penetrates through a first guide wheel assembly on a jib supporting rod and is connected with the jib supporting rod, so that the jib supporting rod is driven to rotate relative to the jib by the main lifting rope until the jib, the jib supporting rod and a first pull plate assembly in a linear state form a stable connection structure, and therefore, after the free end of the main lifting rope is disassembled from the jib supporting rod, the free end of the main lifting rope can directly penetrate through a second guide wheel assembly on the jib head of the jib and is connected with a lifting hook of the crane, so that the installation of the jib is completed.
Compared with the existing auxiliary arm installation mode, the method disclosed by the invention omits the connection and disassembly operation of the main lifting rope and the auxiliary pull rope in the prior art, is convenient for the rope threading operation of the main lifting rope, greatly simplifies the installation procedure of the auxiliary arm, reduces the installation operation difficulty, and effectively improves the installation efficiency of the auxiliary arm.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art installation of a jib of a crane;
FIG. 2 is a schematic flow chart of a crane jib installation method provided by the invention;
fig. 3 is a schematic structural diagram of the present invention in S2, wherein the supporting rod of the fly jib is lifted to drive the supporting rod of the fly jib to form a first preset angle α with respect to the fly jib;
fig. 4 is a schematic view of the construction of the present invention for connecting the free end of the main lift cord to the sub-arm support bar at S2;
FIG. 5 is a schematic diagram illustrating the operation of threading the main lift cords in S4 according to the present invention;
reference numerals:
1: a main arm; 2: an auxiliary arm; 3: a secondary arm support rod;
4: auxiliary hoisting; 5: a first pull cord; 6: a second pull cord;
7: a main hoisting rope; 8: a first pull plate assembly; 9: a second pull plate assembly;
10: a first guide wheel assembly; 11: a second guide wheel assembly; 12: a quick-release joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The crane jib installation method and the crane of the present invention will be described below with reference to fig. 2 to 5.
As shown in fig. 2, the embodiment provides a crane jib installation method, which specifically includes the following steps:
s1, the arm head of the main arm 1 is rotatably connected with the arm tail of the auxiliary arm 2, the arm tail of the auxiliary arm 2 is rotatably connected with the auxiliary arm supporting rod 3, the auxiliary arm 2 is connected with the auxiliary arm supporting rod 3 through the first pull plate component 8, and the first locking structure on the first pull plate component 8 is removed, so that the first pull plate component 8 is in a freely extending state.
Before the main arm 1 and the auxiliary arm 2 are hinged, the main arm 1 is assembled according to an arrangement structure shown in fig. 3, the assembled main arm 1 is placed on the ground, the auxiliary arm 2 is horizontally hung on one side of the main arm 1 by an auxiliary hanger, so that the arm head of the main arm 1 and the arm tail of the auxiliary arm 2 are oppositely arranged, the main arm 1 and the auxiliary arm 2 are distributed on the same straight line, and the arm head of the main arm 1 and the arm tail of the auxiliary arm 2 can be rotatably connected through a pin shaft. In the embodiment, the hinged support can be arranged at the tail end of the auxiliary arm 2, and the tail end of the auxiliary arm support rod 3 is hinged on the hinged support through a pin shaft.
Meanwhile, the first pulling plate assembly 8 shown in the present embodiment may include a plurality of pulling plates connected in sequence, and each pulling plate on the first pulling plate assembly 8 may be in two states, namely, a freely extended state and a linear state. The first locking structure shown in this embodiment includes a locking plate, a first lock pin, and a second lock pin; one end of the locking plate is connected with the first locking pin, and the other end of the locking plate is connected with the second locking pin; under the condition that the first pulling plate assembly 8 is in a linear state, the first locking pin and the second locking pin are respectively inserted on two adjacent pulling plates. From this, when each arm-tie on the first arm-tie subassembly 8 is in rectilinear state, because two arbitrary adjacent arm-ties all pass through first locking structure, first arm-tie subassembly 8 has stronger stability to can provide stronger supporting power along the length direction of arm-tie. Here, it may be specifically provided that the pulling plate at the head end of the first pulling plate assembly 8 is movably connected with the tail end of the auxiliary arm supporting rod 3, and the pulling plate at the tail end of the first pulling plate assembly 8 is movably connected with the arm head of the auxiliary arm 2.
And S2, the free end of the main lifting rope 7 penetrates through the first guide wheel assembly 10 on the fly jib support rod 3 and is connected with the fly jib support rod 3 to lift the fly jib support rod 3, and the fly jib support rod 3 is driven to rotate to a first preset angle position relative to the fly jib 2 along a first rotation direction.
As shown in fig. 3, when the jib support rod 3 is lifted, the head end of the jib support rod 3 may be connected to one end of the first pull rope 5, the other end of the first pull rope 5 may be connected to the hook of the auxiliary crane 4, and the hook of the auxiliary crane 4 may be controlled to be lifted vertically upward, so as to drive the jib support rod 3 to rotate to the position of the first preset angle α in the first rotation direction with respect to the jib 2.
Wherein, in order to facilitate the lifting of the sub-arm support rod 3 and the rope threading operation of the main lifting rope 7 through the first guide wheel assembly 10, the present embodiment can specifically set the size of the first preset angle α to be 30 ° -80 °, for example: the first preset angle α is specifically 30 °, 45 °, 50 °, 60 °, 80 °, and the like, and is not specifically limited herein.
As shown in fig. 4, the first guide pulley assembly 10 shown in this embodiment may be embodied as a guide pulley mounted at the middle of the sub-arm support bar 3. Similarly, in order to facilitate the quick installation and disassembly of the free end of the main hoisting rope 7 on the auxiliary arm support rod 3, a quick-release joint 12 for conveniently connecting the free end of the main hoisting rope 7 is installed at a position, close to the tail end, on the auxiliary arm support rod 3 shown in this embodiment, the quick-release joint 12 is detachably connected with the auxiliary arm support rod 3, and the other end of the main hoisting rope 7 is connected with the main winch. The free end of the main hoisting rope 7 is connected with the quick-release joint 12 after passing through the first guide pulley assembly 10 on the fly jib supporting rod 3.
The quick release connector 12 may be any one of an eyebolt, a hook, a lock, and a clamp, and is not limited herein.
And S3, tightening the main lifting rope 7, driving the auxiliary arm supporting rod 3 to continue to rotate to a position of a second preset angle relative to the auxiliary arm 2 along the first rotation direction, so that the first pulling plate assembly 8 is converted into a linear state from a free stretching state, and installing a first locking structure on the first pulling plate assembly 8, so that the first pulling plate assembly 8 keeps the linear state, and the auxiliary arm supporting rod 3 is stably supported.
Specifically, in order to ensure that the sub-arm support rod 3 can be driven to rotate relative to the sub-arm 2 through the main hoisting rope 7, the present embodiment further includes, before tightening the main hoisting rope 7: the lifting operation of the auxiliary arm support rod 3 is released. When the lifting operation of the sub-jib support rod 3 is released, the other end of the first rope 5 can be disengaged from the hook of the auxiliary crane 4, and the first rope 5 can be fixed to the lug of the sub-jib support rod 3.
Then, when the main hoisting rope 7 is tightened, the main winch is specifically started, and the main hoisting rope 7 is tightened by the main winch to drive the sub-boom support rod 3 to continue to rotate to the position of the second preset angle β along the first rotation direction relative to the sub-boom 2.
The second preset angle β is greater than the first preset angle α, and the size of the second preset angle β is determined by the length of the first pulling plate assembly 8 in a straight state, and the second preset angle β is generally an obtuse angle. When the first pulling plate assembly 8 is in a linear state, the auxiliary arm supporting rod 3, the auxiliary arm 2 and the first pulling plate assembly 8 can form a stable triangular structure.
S4, the free end of the main lift rope 7 is detached from the fly jib support rod 3 and passed through the second guide pulley assembly 11 on the arm head of the fly jib 2.
As shown in fig. 5, after the free end of the main hoisting rope 7 is detached from the sub-boom support rod 3, the main winch may be restarted to unwind the main hoisting rope 7, and the operator may pull the main hoisting rope 7 under the guidance of the first guide wheel assembly 10, pass the main hoisting rope 7 through the overhead second guide wheel assembly 11 of the sub-boom 2, and connect the main hoisting rope 7 to the hook of the crane. The second guide wheel assembly 11 may be a pulley block formed by a plurality of fixed pulleys.
Based on the steps as shown above, the free end of the main lifting rope 7 passes through the first guide wheel assembly 10 on the fly jib support rod 3 and is connected with the fly jib support rod 3, so that the fly jib support rod 3 is driven to rotate relative to the fly jib 2 through the main lifting rope 7 until the fly jib 2, the fly jib support rod 3 and the first pull plate assembly 8 in a linear state form a stable connection structure, and therefore, after the free end of the main lifting rope 7 is disassembled from the fly jib support rod 3, the free end can directly pass through the second guide wheel assembly 11 on the arm head of the fly jib 2 and is connected with the lifting hook of the crane, so that the installation of the fly jib 2 is completed.
Compared with the existing installation mode of the auxiliary boom, the method disclosed by the embodiment omits the connection and disassembly operation of the main lifting rope 7 and the auxiliary pull rope in the prior art, is convenient for the rope threading operation of the main lifting rope 7, greatly simplifies the installation procedure of the auxiliary boom 2, reduces the installation operation difficulty, and effectively improves the installation efficiency of the auxiliary boom 2.
It should be noted that the main hoisting rope 7, the auxiliary ropes and the first rope 5 in the embodiment shown may be steel ropes known in the art.
Further, in order to further ensure the stability of the mounting structure of the sub-arm support rod 3, the present embodiment may further provide, between step S3 and step S4: connecting the main arm 1 and the auxiliary arm supporting rod 3 through a second pulling plate assembly 9, and removing a second locking structure on the second pulling plate assembly 9 to enable the second pulling plate assembly 9 to be in a freely extending state; through loosening the main lifting rope 7, the auxiliary arm 2 rotates in a second rotary direction relative to the main arm 1 under the action of self gravity until the second pulling plate assembly 9 is converted into a linear state from a free stretching state, and the second locking structure is installed on the second pulling plate assembly 9, so that the second pulling plate assembly 9 keeps the linear state, and the auxiliary arm supporting rod 3 is stably supported. Therefore, the two sides of the auxiliary arm supporting rod 3 are respectively supported by the first pulling plate assembly 8 and the second pulling plate assembly 9, and the auxiliary arm supporting rod 3 can be effectively prevented from rotating relative to the main arm 1 and the auxiliary arm 2.
In this embodiment, the second rotation direction is opposite to the rotation direction of the first rotation direction, that is, when the first rotation direction is clockwise, the second rotation direction is counterclockwise, and correspondingly, when the second rotation direction is clockwise, the first rotation direction is counterclockwise, which is not limited herein.
Meanwhile, the first pulling plate assembly 8 and the second pulling plate assembly 9 shown in this embodiment have the same structure, and the first locking structure and the second locking structure have the same structure, which is not described herein again.
Preferably, the present embodiment further provides a crane, including: the main arm 1 and the auxiliary arm 2, the auxiliary arm 2 is installed on the main arm 1 by adopting the installation method of the crane auxiliary arm.
The crane shown in the present embodiment is preferably a crawler crane.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A crane jib installation method is characterized by comprising the following steps:
s1, rotatably connecting the arm head of the main arm with the arm tail of the auxiliary arm, rotatably connecting the arm tail of the auxiliary arm with the tail end of an auxiliary arm supporting rod, connecting the auxiliary arm with the auxiliary arm supporting rod through a first pulling plate component, and removing a first locking structure on the first pulling plate component to enable the first pulling plate component to be in a freely extending state;
s2, enabling the free end of the main lifting rope to penetrate through the first guide wheel assembly on the auxiliary arm supporting rod and be connected with the auxiliary arm supporting rod, hoisting the auxiliary arm supporting rod, and driving the auxiliary arm supporting rod to rotate to a position of a first preset angle relative to the auxiliary arm along a first rotation direction;
s3, tightening the main lifting rope, driving the auxiliary arm supporting rod to rotate relative to the auxiliary arm to a position of a second preset angle along the first rotation direction continuously, so that the first pulling plate assembly is converted into a linear state from a free stretching state, and mounting the first locking structure on the first pulling plate assembly, so that the first pulling plate assembly keeps the linear state;
and S4, disassembling the free end of the main lifting rope from the supporting rod of the auxiliary arm, and penetrating the free end of the main lifting rope through a second guide wheel assembly on the arm head of the auxiliary arm.
2. A crane jib installation method as claimed in claim 1,
in S2, the pair of fly jib bracing pieces is lifted by crane, including: connecting the head end of the auxiliary arm supporting rod with one end of a first pull rope, connecting the other end of the first pull rope with a lifting hook of an auxiliary crane, and controlling the lifting hook of the auxiliary crane to be lifted vertically upwards;
accordingly, in S3, before the main hoisting rope is tightened, the method further includes the following steps: and separating the other end of the first pull rope from the lifting hook of the auxiliary crane, and fixing the first pull rope on the lock lug of the auxiliary arm support rod.
3. A crane jib installation method as claimed in claim 1,
the first preset angle alpha is 30-80 degrees, and the second preset angle beta is determined by the length of the first pulling plate assembly in a linear state.
4. A crane jib installation method as claimed in claim 1,
s2, the passing the free end of the main lift rope through the first guide pulley assembly on the fly jib support bar and connecting with the fly jib support bar includes:
and a quick-release joint is arranged at a position, close to the tail end of the auxiliary arm supporting rod, on the auxiliary arm supporting rod, and the free end of the main lifting rope penetrates through the first guide wheel assembly on the auxiliary arm supporting rod and then is connected with the quick-release joint.
5. A crane jib installation method as claimed in claim 4,
the quick-release connector comprises any one of an eyebolt, a hook, a lock hanger and a clamp.
6. A crane jib mounting method as claimed in any one of claims 1 to 5, further comprising, between S3 and S4:
connecting the main arm with the auxiliary arm supporting rod through a second pulling plate assembly, and removing a second locking structure on the second pulling plate assembly to enable the second pulling plate assembly to be in a free extension state;
loosening the main lifting rope to enable the auxiliary arm to rotate in a second rotating direction relative to the main arm under the action of self gravity until the second pulling plate assembly is converted into a linear state from a freely stretching state, and installing the second locking structure on the second pulling plate assembly to enable the second pulling plate assembly to keep the linear state;
wherein the second rotation direction is opposite to the first rotation direction.
7. A crane jib installation method as claimed in claim 6,
the first pulling plate assembly and the second pulling plate assembly have the same structure and respectively comprise a plurality of pulling plates which are connected in sequence;
the first locking structure and the second locking structure have the same structure and respectively comprise a locking plate, a first locking pin and a second locking pin; one end of the locking plate is connected with the first locking pin, and the other end of the locking plate is connected with the second locking pin; under the condition that the first pulling plate assembly or the second pulling plate assembly is in a linear state, the first locking pin and the second locking pin are respectively inserted into two adjacent pulling plates.
8. A crane jib installation method as claimed in any one of claims 1 to 5 further comprising, prior to S1:
assembling the main arm, and placing the assembled main arm on the ground;
and hoisting the auxiliary boom by adopting an auxiliary crane, and placing the auxiliary boom at one side of the main boom, so that the boom head of the main boom is opposite to the boom tail of the auxiliary boom, and the main boom and the auxiliary boom are distributed on the same straight line.
9. A crane jib installation method as claimed in any one of claims 1 to 5, wherein in S1, the head of the main jib is pivotally connected to the tail of the jib by a pin, and the tail of the jib is pivotally connected to the tail of the jib support rod by a pin.
10. A crane comprising a primary jib and a secondary jib, wherein said secondary jib is mounted on said primary jib by means of a method of mounting a secondary jib of a crane according to any one of claims 1 to 9.
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| CN202110159111.7A CN112811329B (en) | 2021-02-04 | 2021-02-04 | Crane auxiliary arm mounting method and crane |
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| CN102358580A (en) * | 2011-08-12 | 2012-02-22 | 中联重科股份有限公司 | Folding boom structure and method for unfolding and folding the same |
| CN102381641A (en) * | 2011-11-04 | 2012-03-21 | 三一汽车起重机械有限公司 | Crane auxiliary arm mounting equipment and crane auxiliary arm mounting method |
| CN202322105U (en) * | 2011-11-04 | 2012-07-11 | 三一汽车起重机械有限公司 | Crane and device for installing auxiliary boom of crane |
| CN102897677A (en) * | 2012-09-24 | 2013-01-30 | 三一重工股份有限公司 | Crane fly jib self-assembly and disassembly device and method, as well as crane |
| CN104058342A (en) * | 2013-03-18 | 2014-09-24 | 神钢起重机株式会社 | Raisable-lowerable Member |
| CN103601082A (en) * | 2013-11-22 | 2014-02-26 | 中联重科股份有限公司 | Crane and arm lifting method thereof |
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