CN113120782A

CN113120782A - Fly jib, crane, fly jib deployment method, and fly jib retraction method

Info

Publication number: CN113120782A
Application number: CN202110475361.1A
Authority: CN
Inventors: 马善华; 张艳伟; 朱威; 李伟
Original assignee: Xuzhou Heavy Machinery Co Ltd
Current assignee: Xuzhou Heavy Machinery Co Ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-07-16
Anticipated expiration: 2041-04-29
Also published as: CN113120782B

Abstract

The invention discloses an auxiliary jib, a crane, an auxiliary jib unfolding method and an auxiliary jib retracting method, relates to the field of engineering machinery, and aims to simplify the installation and the disassembly of the auxiliary jib. The auxiliary arm comprises an auxiliary arm main body and a screw ejecting mechanism. The sub-arm main body comprises a connecting frame with a first connecting hole and a second connecting hole, and the first connecting hole and the second connecting hole are coaxially arranged. The jackscrew mechanism comprises a first shaft, a second shaft and a driving mechanism; the first shaft and the second shaft are both disposed between the first connection hole and the second connection hole, and both the first shaft and the second shaft are coaxial with the first connection hole. The driving mechanism is in driving connection with the first shaft and the second shaft so as to drive the first shaft and the second shaft to extend and retract simultaneously. When the first shaft is in an extending state, the first shaft is inserted into the first connecting hole, and when the first shaft is in a retracting state, the first shaft is separated from the first connecting hole; when the second shaft is in the extending state, the second shaft is inserted into the second connecting hole, and when the second shaft is in the retracting state, the second shaft is separated from the second connecting hole.

Description

Fly jib, crane, fly jib deployment method, and fly jib retraction method

Technical Field

The invention relates to the field of engineering machinery, in particular to an auxiliary jib, a crane, an auxiliary jib unfolding method and an auxiliary jib retracting method.

Background

In order to obtain a suitable hoisting height and amplitude, the crane is designed with a multi-section telescopic boom. But is limited by the structure and the weight, in the related technology, the main arm is 3-7 sections; for medium and small tonnage cranes, the main jib is generally no more than 5 sections. In order to further extend the length of the jib to achieve higher lifting heights and amplitudes, the crane is equipped with a secondary jib. When not in use, the auxiliary arm is arranged on one side of the basic arm of the main arm; when the auxiliary arm needs to be used, the auxiliary arm is arranged at the head of the tail arm of the main arm, and the auxiliary arm is connected with the tail arm through a pin shaft.

In the related art, when the auxiliary arm is unfolded, after a related connecting pin shaft is removed, the auxiliary arm is firstly rotated around a rotating shaft of a front support arranged on the main arm until an auxiliary arm mounting hole is aligned with a connecting hole on one side of the width direction of the arm head of the tail arm; then inserting two first connecting pin shafts; then, pulling out the front support pin shaft, and continuously pushing the auxiliary arm to rotate around the first connecting pin shaft until the mounting hole on the other side of the auxiliary arm is aligned with the hole on the other side of the arm head in the width direction; and then inserting two second connecting pin shafts to complete the installation and fixation of the auxiliary arm. And the recovery auxiliary arm needs to pull out each connecting pin shaft step by step.

The fixed auxiliary arms are arranged on two sides of the arm support in the width direction through pin shafts, and two pin shafts are coaxially arranged on each side in the width direction. During installation, the auxiliary arm is rotated until the auxiliary arm installation hole is aligned with the main arm connecting hole, and then the four connecting pin shafts are sequentially knocked into the holes by using tools.

The inventor finds that at least the following problems exist in the prior art: in the existing installation mode of the auxiliary arm pin shaft, due to the limitation of machining errors, the auxiliary arm installation hole and the main arm connection hole are difficult to align accurately, and the pin shaft is difficult to penetrate and pull out. Usually need use the copper hammer to strike, the arm head position is higher, and especially the position height that the top round pin axle was located, the operator need ascend a height just can accomplish the round pin axle dismouting operation. The installation efficiency is low and the operation is inconvenient.

Disclosure of Invention

The invention provides an auxiliary jib, a crane, an auxiliary jib unfolding method and an auxiliary jib retracting method, which are used for simplifying the installation and the disassembly of the auxiliary jib.

An embodiment of the present invention provides an auxiliary arm, including:

an auxiliary arm body including a link frame having a first link hole and a second link hole, the first link hole and the second link hole being coaxially arranged; and

the jackscrew mechanism comprises a first shaft, a second shaft and a driving mechanism; the first shaft and the second shaft are both arranged between the first connecting hole and the second connecting hole, and are both coaxial with the first connecting hole; the driving mechanism is in driving connection with the first shaft and the second shaft so as to drive the first shaft and the second shaft to extend and retract simultaneously;

when the first shaft is in an extending state, the first shaft is inserted into the first connecting hole, and when the first shaft is in a retracting state, the first shaft is separated from the first connecting hole; when the second shaft is in the extending state, the second shaft is inserted into the second connecting hole, and when the second shaft is in the retracting state, the second shaft is separated from the second connecting hole.

In some embodiments, the drive mechanism comprises:

the first connecting seat is fixedly connected with the connecting frame; the first connecting seat is provided with a first through hole allowing the first shaft to pass through;

the second connecting seat is also fixedly connected with the connecting frame; the second connecting seat is provided with a second through hole for allowing the second shaft to pass through; and

a rotating drum arranged between the first connecting seat and the second connecting seat, and rotatably connected with at least one of the first connecting seat and the second connecting seat;

the first shaft is provided with a first thread at one end facing the rotary drum, the first end of the rotary drum is correspondingly provided with a first thread section, the first thread is in thread fit with the first thread section, and the first shaft is positioned in the first through hole; a second thread is arranged at one end, facing the rotary drum, of the second shaft, a second thread section is correspondingly arranged at the second end of the rotary drum, the second thread and the second thread section form thread fit, and the second shaft is located in the second through hole; the first thread and the second thread have opposite directions of rotation.

In some embodiments, the drive mechanism further comprises:

the inner ring of the first bearing is sleeved on the rotary drum;

the first end cover is provided with a first concave part, and the first end cover is fixedly connected with the outer ring of the first bearing and the second connecting seat; and

the second end cover is provided with a second concave part, and the second end cover is fixedly connected with the outer ring of the first bearing and the second connecting seat;

the first inner concave part and the second inner concave part are spliced to form an installation cavity for accommodating the first bearing.

In some embodiments, the outer wall of the second end of the drum is provided with meshing teeth; the drive mechanism further includes:

the gear is positioned outside the rotary drum and in the second through hole of the second connecting seat; the gear is meshed with the meshing teeth; and

a gear shaft inserted into the through hole of the gear; the gear shaft and the second connecting seat are rotatably connected.

In some embodiments, the number of teeth of the gear is less than the number of teeth of the outer wall of the second end of the drum on which the meshing teeth are provided.

In some embodiments, one end of the gear shaft protrudes through the second through hole of the second coupling seat, and a portion of the gear shaft located outside the second through hole is configured to be non-circular.

In some embodiments, the jackscrew mechanism further comprises:

the guide mechanism comprises a first guide piece, a second guide piece and a third guide piece, wherein the first guide piece comprises a first installation end and a first extending end; the first mounting end is mounted on the first connecting seat, and the first extending end extends into the first through hole;

the outer wall of the first shaft is provided with a first sliding groove, and the length direction of the first sliding groove is parallel to the axis direction of the first shaft; the first protruding end is inserted into the first sliding groove.

In some embodiments, the guide mechanism further comprises:

a second guide member including a second mounting end and a second projecting end; the second mounting end is mounted on the second connecting seat, and the second extending end extends into the second through hole;

the outer wall of the second shaft is provided with a second sliding groove, and the length direction of the second sliding groove is parallel to the axis direction of the second shaft; the second protruding end is inserted into the second sliding groove.

In some embodiments, the dimension of the first shaft distal from the end of the drum is less than the dimension of the first shaft toward the end of the drum; and/or the dimension of the end of the second shaft away from the drum is smaller than the dimension of the end of the second shaft towards the drum.

In some embodiments, at least one set of the first connection hole and the second connection hole is respectively disposed on both sides of the connection frame along a width direction of the sub-arm main body; and the jackscrew mechanism is arranged between the first connecting hole and the second connecting hole of each group.

The embodiment of the invention also provides a crane which comprises the auxiliary arm provided by any technical scheme of the invention.

The embodiment of the invention also provides an auxiliary arm unfolding method, wherein the auxiliary arm is provided by any technical scheme of the invention, and the auxiliary arm unfolding method comprises the following steps:

the auxiliary arm is rotatably connected around the first support until the first connecting hole and the second connecting hole which are positioned on one side of the auxiliary arm in the width direction are aligned with the inserting holes of the respective main arms; the main arm is provided with two coaxial plug holes on each side along the width direction of the main arm; the first support is arranged on the main arm, and the auxiliary arm is rotatably connected with the first support; wherein the first support is fixed to the main arm;

and a driving mechanism for driving the sub-arm so that the first shaft on one side of the sub-arm in the width direction is inserted into the first connecting hole and one of the inserting holes and the second shaft is inserted into the second connecting hole and the other inserting hole.

In some embodiments, the secondary arm deployment method further comprises the steps of:

continuing to rotate the auxiliary arm until the first connecting hole and the second connecting hole which are positioned on the other side of the auxiliary arm in the width direction are aligned with the inserting holes of the respective main arms;

and a driving mechanism for driving the auxiliary arm, so that the first shaft positioned at the other side of the auxiliary arm in the width direction is inserted into the first connecting hole and one of the inserting holes, and the second shaft is inserted into the second connecting hole and the other inserting hole.

The embodiment of the invention also provides a method for retracting the fly jib, wherein the fly jib is provided by any technical scheme of the invention, and the method for retracting the fly jib comprises the following steps:

a driving mechanism for driving the screw jacking mechanism at one side of the auxiliary arm far away from the first bracket, so that the first shaft and the second shaft driven by the driving mechanism are retracted to disconnect the auxiliary arm from the main arm;

continuing to rotate the secondary arm until the secondary arm is adjacent to the first support of the primary arm;

connecting the secondary arm to the first support;

continuing to rotate the secondary arm so that the secondary arm approaches a second bracket mounted to the primary arm; wherein the second bracket and the first bracket are arranged at intervals;

a driving mechanism that drives the jack screw mechanism near one side of the first bracket to retract the first shaft and the second shaft driven by the driving mechanism to disconnect the sub-arm and the main arm;

connecting the secondary arm to the second bracket.

The fly jib that above-mentioned technical scheme provided has fly jib main part and jackscrew mechanism, and the link of fly jib main part and the cooperation of the primary shaft and the secondary shaft of jackscrew mechanism, and stretch out, retract when through primary shaft and secondary shaft, realize the installation and the dismantlement of fly jib, it is very convenient to operate. In addition, the efficiency of mounting, dismounting and mounting the first shaft and the second shaft can be improved by at least one time by one-time operation.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic view illustrating a connection state between an auxiliary arm and a main arm according to an embodiment of the present invention;

fig. 2 is a partially enlarged schematic view of the position of the connecting frame in the state where the auxiliary arm and the main arm are connected according to the embodiment of the present invention;

FIG. 3 is a partial enlarged view of the auxiliary arm at the connecting frame according to the embodiment of the present invention;

fig. 4 is a schematic perspective view of a screw ejecting mechanism of an auxiliary arm according to an embodiment of the present invention;

fig. 5 is an exploded view of a screw pushing mechanism of the auxiliary arm according to the embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a sub-jib jackscrew mechanism provided in an embodiment of the present invention in a retracted state;

FIG. 7 is a schematic cross-sectional view of the sub-jib jackscrew mechanism provided in an embodiment of the present invention in an extended state;

FIG. 8 is a schematic flow chart of a method for deploying an auxiliary arm according to further embodiments of the present invention;

fig. 9 is a schematic flow chart of a method for retracting the secondary arm according to still other embodiments of the present invention.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 9.

Nouns, terms used herein are to be interpreted.

Main arm: also known as the main boom. The main arm is used for hoist and mount, telescopic arm on the hoist, comprises 3 ~ 7 festival arms. The basic arm of the main arm is positioned at the outermost section of the main arm, and the main arm keeps the position when being stretched. The tail section of the main arm is the innermost section of the main arm, and the main arm is located at the highest position when extending out and is connected with a lifting hook to carry out lifting operation. One or more sections of middle arms are arranged between the basic arm and the tail arm of the main arm.

An auxiliary arm: also called as an auxiliary crane boom, can be arranged at the head part of the tail section of the main boom and is used for expanding the length of the suspension arm and realizing higher hoisting height.

Referring to fig. 1, an embodiment of the present invention provides an fly jib 100, which fly jib 100 is used to extend the boom length of a crane. The sub-boom 100 is installed at the head of the last arm of the main boom 200 of the crane, if necessary, so that the length of the entire boom is increased. After use, the sub-arm 100 is detached from the head of the last arm of the main arm 200 and attached to the side surface of the main arm 200. The auxiliary jib 100 provided by the embodiment of the invention is used for simplifying the mounting and dismounting actions between the auxiliary jib 100 and the main jib 200, so that the mounting and dismounting operations of the auxiliary jib of the crane are more convenient, reliable and efficient.

Referring to fig. 1 to 3, the sub-arm 100 includes a sub-arm body 1 and a jack screw mechanism 2. The sub arm body 1 includes a link frame 11, the link frame 11 having a first link hole 111 and a second link hole 112, the first link hole 111 and the second link hole 112 being coaxially arranged. Referring to fig. 4 and 5, the jack-screw mechanism 2 includes a first shaft 21, a second shaft 22, and a drive mechanism 23. The first shaft 21 and the second shaft 22 are both arranged between the first connection hole 111 and the second connection hole 112, and the first shaft 21 and the second shaft 22 are both coaxial with the first connection hole 111. The driving mechanism 23 is in driving connection with the first shaft 21 and the second shaft 22 to drive the first shaft 21 and the second shaft 22 to extend and retract simultaneously. Here, referring to fig. 7, when the first shaft 21 is in the extended state, the first shaft 21 is inserted into the first connection hole 111. Referring to fig. 6, when the first shaft 21 is in the retracted state, the first shaft 21 is away from the first coupling hole 111. Referring to fig. 7, when the second shaft 22 is in the extended state, the second shaft 22 is inserted into the second coupling hole 112. Referring to fig. 6, when the second shaft 22 is in the retracted state, the second shaft 22 is out of the second coupling hole 112.

The auxiliary arm main body 1 comprises an arm support 12 and a connecting frame 11, and the length and the size of the arm support 12 are set according to requirements. The connecting frame 11 is located at the end of the arm frame 12. The connection between the main arm 200 and the sub arm 100 is achieved by the connecting frame 11. When the sub-boom 100 is required to be operated, the main boom 200 and the sub-boom 100 are coupled together. When the operation of the sub-jib 100 is not required, the main jib 200 and the sub-jib 100 are disconnected, and then the sub-jib 100 is mounted to the side of the main jib 200.

Referring to fig. 2 and 3, in some embodiments, at least one set of first and second coupling holes 111 and 112 are provided at both sides of the coupling frame 11 in the width direction of the sub-arm main body 1. The jack mechanism 2 is disposed between each set of the first connection hole 111 and the second connection hole 112.

Referring to fig. 2 and 3, the link frame 11 is a substantially rectangular frame, and a protrusion portion is provided at each corner of the rectangular frame, each protrusion portion having one or two coupling holes. Taking the direction of the connecting frame 11 in the use state as an example, i.e. the direction illustrated in fig. 3, the connecting hole at the top is the first connecting hole 111, and the connecting hole at the bottom is the second connecting hole 112. The first connection hole 111 corresponds to the insertion hole at the corresponding position of the main arm 200, that is, the first insertion hole 201 corresponds to the first connection hole; the first connection hole 111 also corresponds to the first shaft 21. The second connecting hole 112 corresponds to another inserting hole at a position corresponding to the main arm 200, i.e., the second inserting hole 202; the second connecting hole 112 also corresponds to the second shaft 22.

The first shaft 21 and the second shaft 22 are simultaneously extended and simultaneously retracted. For convenience of description, both widthwise sides of the sub-arm 100 are labeled as a side and B side. Wherein the first shaft 21 and the second shaft 22 on the a side are simultaneously in the extended state and simultaneously in the retracted state. The first shaft 21 and the second shaft 22 on the B side are simultaneously in the extended state and simultaneously in the retracted state. Side a corresponds to a side of the main arm 200 close to the first bracket, and side B corresponds to a side of the main arm 200 away from the first bracket. When the sub-arm 100 is mounted, the first shaft 21 and the second shaft 22 on the a side first extend, and the first shaft 21 and the second shaft 22 on the B side first extend. When the sub-arm 100 is detached, the first shaft 21 and the second shaft 22 on the B side retract first, and the first shaft 21 and the second shaft 22 on the a side retract later.

Referring to fig. 2 and 3, one jack mechanism 2 is disposed on each of the a and B sides in the width direction of the sub-arm 100. As described above, the connecting frame 11 is substantially rectangular. Between the two projections of the link frame 11 on the a side, a jack screw mechanism 2 is arranged. Between the two projections of the link frame 11 on the B side, a jack screw mechanism 2 is also arranged. The two jackscrew mechanisms 2 may be implemented in the same way.

Referring to fig. 2, 4 and 5, the jack-screw mechanism 2 includes a first shaft 21 and a second shaft 22 that are coaxially disposed. In the installation state of the sub-arm 100, the axes of the first shaft 21 and the second shaft 22 of the jackscrew mechanism 2 on the side a are coaxial with the first connecting hole 111, the second connecting hole 112 and the first inserting hole 201 on the side a. The jack screw mechanism 2 on the side B has the axes of the first shaft 21 and the second shaft 22 coaxial with the first connecting hole 111, the second connecting hole 112, and the second inserting hole 202 on the side B. The first shaft 21 and the second shaft 22 of each jack-screw mechanism 2 are simultaneously actuated, i.e., simultaneously extended and retracted. A linkage mechanism may be used to achieve synchronous motion of the first shaft 21 and the second shaft 22.

Referring to fig. 3 to 7, in particular, the driving mechanism 23 of the jack-screw mechanism 2 is implemented as described below.

Referring to fig. 3-7, in some embodiments, the drive mechanism 23 includes a first connecting seat 231, a second connecting seat 232, and a drum 233.

The first connecting seat 231 is fixedly connected with the connecting frame 11; the first connection seat 231 has a first through hole 231 a. The first connection seat 231 and the projection of the connection frame 11 at the top shown in fig. 3 are welded and fixed together. The protrusion has a first connection hole 111. The first through hole 231a of the first connector 231 and the raised first connection hole 111 are coaxial all the time, i.e., whether the sub-arm 100 is in use or in standby. The first shaft 21 is extended and retracted in the first through hole 231 a. When the first shaft 21 protrudes outside the first through hole 231a and continues to protrude, it can be inserted into the first connection hole 111. When the first shaft 21 retracts, it retracts from the first connection hole 111 to the first through hole 231 a.

The second connecting seat 232 is also fixedly connected with the connecting frame 11; the second connecting seat 232 has a second through hole 232 a. The second connecting holder 232 and the projection of the connecting frame 11 at the bottom as shown in fig. 3 are welded and fixed together. The projection of the bottom has a second coupling hole 112. The second through hole 232a of the second connecting seat 232 and the second connecting hole 112 of the projection of the bottom are coaxial at all times, i.e., coaxial regardless of whether the sub-arm 100 is in the use state or the standby state. The second shaft 22 is extended and retracted in the second through hole 232 a. When the second shaft 22 is extended to the outside of the second through hole 232a and is further extended, it can be inserted into the second connection hole 112. When the second shaft 22 is retracted, it is retracted from the second connecting hole 112 to the second through hole 232 a.

The rotary drum 233 is disposed between the first and second connection seats 231 and 232, and the rotary drum 233 is rotatably connected with at least one of the first and second connection seats 231 and 232. Wherein, the first shaft 21 is provided with a first thread 210 towards one end of the drum 233, and the first end of the drum 233 is correspondingly provided with a first thread segment 233 b. The first threads 210 are threadedly engaged with the first thread segments 233 b. The first shaft 21 is located in the first through hole 231 a. The second shaft 22 is provided with a second thread 220 at an end facing the drum 233, and a second end of the drum 233 is correspondingly provided with a second thread segment 233 c. The second threads 220 are in threaded engagement with the second thread segments 233 c. The first thread 210 and the second thread 220 have opposite hand.

The drum 233 is rotated in the first direction, and the first shaft 21 and the second shaft 22 are simultaneously extended. Rotating in the second direction, the first shaft 21 and the second shaft 22 retract simultaneously. The first direction is opposite to the second direction.

According to the technical scheme, the rotary drum 233 is rotated by external force, and the first shaft 21 and the second shaft 22 are driven by the rotary drum 233 to move up and down linearly. And the driving mechanism 23 is driven by the rotation of the threads, utilizes the lead angle of the threads with smaller thread, and can drive the first shaft 21 and the second shaft 22 to stretch and retract with smaller force, so that the mounting process is stable and labor-saving, the size of the driving mechanism is small, the action is stable and reliable, and the operation is very convenient.

With continued reference to fig. 4-7, in some embodiments, the drive mechanism 23 further includes a first bearing 234, a first end cap 235, and a second end cap 236.

The inner ring of the first bearing 234 is sleeved on the rotating drum 233.

The first end cap 235 has a first inner concave portion, and the first end cap 235 is fixedly connected to both the outer ring of the first bearing 234 and the second connecting seat 232.

Second end cap 236 has a second concave portion, and second end cap 236 is fixedly connected to both the outer race of first bearing 234 and second connecting seat 232. Wherein the first and second inner recesses mate to form a mounting cavity for receiving the first bearing 234. During rotation of the drum 233, neither the first end cap 235 nor the second end cap 236 rotates with the drum 233, and the first bearing 234 rotates with the drum 233. The first and second end caps 235 and 236 serve to protect the first bearing 234, prevent foreign objects from entering the first bearing 234, and prevent the operator from being dangerous due to the rotation of the first bearing 234.

The first end cap 235, the second end cap 236 and the second connecting seat 232 are fixedly connected by a plurality of connecting bolts 239. This makes the structure of the entire jack-screw mechanism 2 more stable.

Above-mentioned technical scheme has realized the rotatable coupling of rotary drum 233 and second connecting seat 232 through the bearing. The first connecting seat 231 and the rotary drum 233 do not need to be provided with a rotatable connecting mechanism separately, and the whole jackscrew mechanism 2 is compact in structure and reliable in action.

With continued reference to fig. 4-7, the following describes how to simply rotate the drum 233. In some embodiments, the outer wall of the second end of the drum 233 is provided with engagement teeth 233 a; the drive mechanism 23 further includes a gear 237 and a gear shaft 238. The gear 237 is located outside the rotary drum 233 and in the second through hole 232a of the second coupling seat 232; the gear 237 meshes with the meshing teeth 233 a. The gear shaft 238 is inserted into the through hole of the gear 237; the gear shaft 238 is rotatably connected to the second connecting seat 232. The number of teeth of the gear 237 is smaller than the number of teeth of the meshing teeth 233a provided on the outer wall of the second end of the drum 233, so that the input force is further reduced, and the difficulty in mounting and dismounting the sub-arm 100 is reduced. According to the above technical solution, the rotary drum 233 can be rotated by rotating the gear 237, so that the rotary drum 233 can be rotated more conveniently.

In some embodiments, one end of the gear shaft 238 protrudes through the second through hole 232a of the second coupling seat 232, and a portion of the gear shaft 238 located outside the second through hole 232a is configured to be non-circular. The gear shaft 238 may be rotated using a tool such as a power wrench, and the portion of the gear shaft 238 located outside the second through hole 232a is constructed to be non-circular, so that the gear shaft 238 is well stressed and not easily slipped during the rotation. In addition, the gear shaft 238 is located at one end of the second connecting seat 232 far away from the first connecting seat 231, and is relatively low in position, so that an operator can complete the installation operation of the sub-boom 100 from the ground without ascending a height, and the danger caused by the ascending operation is avoided.

With continued reference to fig. 4-7, the first shaft 21, the second shaft 22, and the rotating cylinder 233 are threadedly engaged, and some rotation may occur during the rotation of the first shaft 21 and the second shaft 22, and in order to reduce the occurrence of this, the first shaft 21 is stably moved up and down linearly, and in some embodiments, the wire-jacking mechanism 2 further includes a guide mechanism 24. The guide mechanism 24 includes a first guide member 241, and the first guide member 241 includes a first mounting end 241a and a first protruding end 241 b. The first mounting end 241a is, for example, a nut. The first protruding end 241b is, for example, a bolt. The first mounting end 241a is mounted to the first connection holder 231, and the first protruding end 241b protrudes into the first through hole 231 a. Wherein, the outer wall of the first shaft 21 is provided with a first sliding chute 211, and the length direction of the first sliding chute 211 is parallel to the axial direction of the first shaft 21; the protruding end of the first guide 241 is inserted into the first sliding slot 211. The first guiding member 241 is, for example, a bolt fixedly installed on the first connecting seat 231, and the bolt is fixed during the linear movement of extending and retracting the first shaft 21. The extending end of the bolt is always positioned in the first sliding slot 211 of the first shaft 21 to ensure that the first shaft 21 extends linearly and retracts linearly.

Referring to fig. 5, in some embodiments, the guide mechanism 24 includes a second guide 242, the second guide 242 including a second mounting end 242a and a second protruding end 242 b; the second mounting end 242a is mounted to the second coupling seat 232, and the second protruding end 242b protrudes into the second through hole 232 a. Wherein, the outer wall of the second shaft 22 is provided with a second sliding chute 221, and the length direction of the second sliding chute 221 is parallel to the axial direction of the second shaft 22; the second protruding end 242b of the second guide 242 is inserted into the second sliding groove 221. The second guiding member 242 is, for example, a bolt fixedly installed on the second connecting seat 232, and the bolt is fixed during the linear movement of extending and retracting the second shaft 22. The extending end of the bolt is always positioned in the second sliding slot 221 of the second shaft 22 to ensure that the second shaft 22 extends linearly and retracts linearly.

Referring to fig. 4-7, in some embodiments, the dimension of the end of the first shaft 21 distal from the drum 233 is less than the dimension of the end of the first shaft 21 toward the drum 233. The end of the first shaft 21 is pointed to facilitate insertion into the first coupling hole 111.

With continued reference to fig. 4-7, the dimension of the end of the second shaft 22 distal from the drum 233 is smaller than the dimension of the end of the second shaft 22 toward the drum 233. The end of the second shaft 22 is pointed to facilitate insertion into the second coupling hole 112.

The embodiment of the invention also provides a crane, which comprises the auxiliary jib 100 provided by any technical scheme of the invention.

Referring to fig. 8, an embodiment of the present invention further provides a method for unfolding a secondary arm, where the secondary arm 100 is the secondary arm 100 according to any of the embodiments of the present invention. The fly jib 100 is used for a crane. The main arm 200 of the crane includes a first bracket (not shown) and a second bracket (not shown). The first and second supports are dispersedly arranged in the length direction of the main arm 200, and are located at the side of the main arm 200. The auxiliary arm unfolding method comprises the following steps:

step S110 of pivotally coupling the sub-arm 100 about the first bracket until the first coupling hole 111 and the second coupling hole 112 located at one side in the width direction of the sub-arm 100 are aligned with the insertion holes of the respective main arms 200. Wherein, along the width direction of the main arm 200, two coaxial plugging holes are arranged on each side of the main arm 200, that is, two first plugging holes 201 on the a side and a second plugging hole 202 on the a side are coaxial, and two first plugging holes 201 on the B side and a second plugging hole 202 on the B side are coaxial. The first support is arranged on the main arm 200, and the auxiliary arm 100 is rotatably connected with the first support;

step S120, the driving mechanism 23 of the sub-arm 100 is driven so that the first shaft 21 located on one side in the width direction of the sub-arm 100 is inserted into the first connection hole 111 and one of the insertion holes, and at the same time, the second shaft 22 is inserted into the second connection hole 112 and the other insertion hole. That is, the first shaft 21 and the second shaft 22 on the a side are simultaneously protruded so that the first shaft 21 is inserted into the first connection hole 111 and the first inserting hole 201 on the a side and the second shaft 22 is inserted into the second connection hole 112 and the second inserting hole 202 on the a side.

The steps of inserting the first shaft 21 and the second shaft 22 are as follows: when the sub-arm 100 is installed, the sub-arm 100 is rotated into the first coupling hole 111 of the sub-arm 100. After the connecting holes 112 are aligned with the first inserting holes of the main arm 200, the gear 237 is rotated by a manual or automatic tool, the gear 237 drives the rotating drum 233 to rotate, the inner side of the rotating drum 233 is threaded to push the first shaft 21 and the second shaft 22 to extend upwards and downwards at the same time, and the first connecting hole 111, the second connecting hole 112 and the first inserting holes are penetrated, so that the locking of the a-side auxiliary arm 100 is completed. Then, the sub-arm 100 is further pushed to rotate around the a-side jack screw shaft, and the first shaft 21 and the second shaft 22 of the other B-side jack screw mechanism 2 are mounted, thereby completing the locking of the sub-arm 100.

With continued reference to fig. 8, in some embodiments, the secondary arm deployment method further comprises the steps of:

step S130, the rotation of the sub arm 100 is continued until the first connection hole 111 and the second connection hole 112 located at the other side in the width direction of the sub arm 100, i.e., the B side, are also aligned with the insertion holes of the respective main arms 200. That is, the first connection hole 111 on the B side is aligned with the first insertion hole 201 of the main arm 200 on the B side, and the second connection hole 112 on the B side is aligned with the second insertion hole 202 of the main arm 200 on the B side.

Step S140, the driving mechanism 23 of the sub-arm 100 is driven so that the first shaft 21 on the other side in the width direction of the sub-arm 100, i.e., the B side, is inserted into the first connection hole 111 and the first inserting hole 201, and the second shaft 22 is inserted into the second connection hole 112 and the second inserting hole 202.

By the technical scheme, the main arm 200 and the auxiliary arm 100 can be conveniently installed.

Referring to fig. 9, an embodiment of the present invention further provides a method for retracting the sub-arm, where the sub-arm 100 is the sub-arm 100 according to any of the embodiments of the present invention. The fly jib 100 is used for a crane. The main arm 200 of the crane includes a first bracket and a second bracket. The first and second supports are dispersedly arranged in the length direction of the main arm 200, and are located at the side of the main arm 200. The sub-arm retracting method is the reverse of the arrangement of the sub-arm 100 mounting method. The auxiliary arm retraction method comprises the following steps:

step S210, the driving mechanism 23 of the jack screw mechanism 2 on the side away from the first carriage is driven to retract the first shaft 21 and the second shaft 22 driven by the driving mechanism 23, so that the sub-arm 100 and the main arm 200 are disconnected. That is, both the first shaft 21 and the second shaft 22 on the B-side are retracted, and thus the connection of the main arm 200 and the sub arm 100 on the B-side is disconnected.

The specific operation steps are as follows: when the auxiliary arm 100 is detached, the gear 237 is rotated in the direction opposite to the direction when the auxiliary arm 100 is installed, the gear 237 rotates to drive the drum 233 to rotate synchronously, and the drum 233 rotates to drive the first shaft 21 and the second shaft 22 which are in threaded connection with the drum 233 to retract, so that the retraction of the first shaft 21 and the second shaft 22 on the B side is realized.

Step S220, the auxiliary arm 100 continues to be rotated until the auxiliary arm 100 approaches the first support of the main arm 200.

Step S230, the sub-arm 100 is connected to the first bracket.

Step S240 continues to rotate the sub-boom 100 so that the sub-boom 100 approaches the second bracket, which is mounted to the main boom 200. Wherein the second bracket and the first bracket are arranged at intervals.

Step S250, the driving mechanism 23 of the jack-screw mechanism 2 near one side of the first bracket is driven to retract the first shaft 21 and the second shaft 22 driven by the driving mechanism 23, so that the sub-arm 100 and the main arm 200 are disconnected. That is, the first shaft 21 and the second shaft 22 on the a side are simultaneously retracted, and the connection of the main arm 200 and the sub arm 100 on the a side is disconnected.

Step S260, the sub-arm 100 is connected to the second bracket.

According to the technical scheme, the main arm 200 and the auxiliary arm 100 can be conveniently detached.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

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: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An auxiliary arm, comprising:

an auxiliary arm main body (1) including a link frame (11), the link frame (11) having a first link hole (111) and a second link hole (112), the first link hole (111) and the second link hole (112) being coaxially arranged; and

a jack screw mechanism (2) comprising a first shaft (21), a second shaft (22) and a driving mechanism (23); -said first shaft (21) and said second shaft (22) are both arranged between said first connection hole (111) and said second connection hole (112), and said first shaft (21) and said second shaft (22) are both coaxial to said first connection hole (111); the driving mechanism (23) is in driving connection with the first shaft (21) and the second shaft (22) so as to drive the first shaft (21) and the second shaft (22) to extend and retract simultaneously;

wherein, when the first shaft (21) is in an extended state, the first shaft (21) is inserted into the first connection hole (111); when the first shaft (21) is in a retracted state, the first shaft (21) leaves the first connection hole (111); when the second shaft (22) is in a protruding state, the second shaft (22) is inserted into the second connecting hole (112); when the second shaft (22) is in a retracted state, the second shaft (22) is away from the second connecting hole (112).

2. The secondary arm according to claim 1, characterized in that said drive mechanism (23) comprises:

the first connecting seat (231) is fixedly connected with the connecting frame (11); the first connection seat (231) has a first through hole (231a) allowing the first shaft (21) to pass through;

the second connecting seat (232) is also fixedly connected with the connecting frame (11); the second connecting seat (232) is provided with a second through hole (232a) allowing the second shaft (22) to pass through; and

a rotary drum (233) disposed between the first connection seat (231) and the second connection seat (232), and the rotary drum (233) is rotatably connected to at least one of the first connection seat (231) and the second connection seat (232);

wherein one end of the first shaft (21) facing the rotary drum (233) is provided with a first thread (210), the first end of the rotary drum (233) is correspondingly provided with a first thread section (233b), the first thread (210) and the first thread section (233b) are in threaded fit, and the first shaft (21) is positioned in the first through hole (231 a); a second thread (220) is arranged at one end of the second shaft (22) facing the rotary drum (233), a second thread section (233c) is correspondingly arranged at the second end of the rotary drum (233), the second thread (220) and the second thread section (233c) form a threaded fit, and the second shaft (22) is positioned in the second through hole (232 a); the first thread (210) and the second thread (220) have opposite directions of rotation.

3. The secondary arm according to claim 2, wherein the drive mechanism (23) further comprises:

a first bearing (234), wherein the inner ring of the first bearing (234) is sleeved on the rotary drum (233);

the first end cover (235) is provided with a first inner concave part, and the first end cover (235) is fixedly connected with the outer ring of the first bearing (234) and the second connecting seat (232); and

a second end cover (236) having a second inner concave portion, wherein the second end cover (236) is fixedly connected with both the outer ring of the first bearing (234) and the second connecting seat (232);

wherein the first and second inner recesses are pieced together to form a mounting cavity for receiving the first bearing (234).

4. The secondary arm according to claim 2, characterized in that the outer wall of the second end of the drum (233) is provided with meshing teeth (233 a); the drive mechanism (23) further comprises:

a gear (237) located outside the drum (233) and in a second through hole (232a) of the second coupling seat (232); the gear (237) is meshed with the meshing teeth (233 a); and

a gear shaft (238), the gear shaft (238) being inserted into the through hole of the gear (237); the gear shaft (238) is rotatably connected with the second connecting seat (232).

5. An auxiliary arm according to claim 4, characterized in that the number of teeth of the gear wheel (237) is smaller than the number of teeth of the outer wall of the second end of the drum (233) provided with the meshing teeth (233 a).

6. The sub-arm as claimed in claim 4, wherein one end of the gear shaft (238) protrudes through the second through hole (232a) of the second coupling seat (232), and a portion of the gear shaft (238) located outside the second through hole (232a) is configured to be non-circular.

7. The secondary arm according to claim 2, wherein the jackscrew mechanism (2) further comprises:

a guide mechanism (24) comprising a first guide (241) comprising a first mounting end (241a) and a first protruding end (241 b); the first mounting end (241a) is mounted to the first connection seat (231), and the first protruding end (241b) protrudes into the first through hole (231 a);

wherein, the outer wall of the first shaft (21) is provided with a first sliding chute (211), and the length direction of the first sliding chute (211) is parallel to the axial direction of the first shaft (21); the first protruding end (241b) is inserted into the first sliding groove (211).

8. The secondary arm according to claim 7, wherein the guide mechanism (24) further comprises:

a second guide (242) including a second mounting end (242a) and a second protruding end (242 b); the second mounting end (242a) is mounted to the second connecting seat (232), and the second protruding end (242b) protrudes into the second through hole (232 a);

the outer wall of the second shaft (22) is provided with a second sliding groove (221), and the length direction of the second sliding groove (221) is parallel to the axial direction of the second shaft (22); the second protruding end (242b) is inserted into the second sliding groove (221).

9. The secondary arm according to claim 1, characterized in that the dimension of the end of the first shaft (21) remote from the drum (233) is smaller than the dimension of the end of the first shaft (21) towards the drum (233); and/or the dimension of the end of the second shaft (22) away from the drum (233) is smaller than the dimension of the end of the second shaft (22) towards the drum (233).

10. The sub-arm according to claim 1, characterized in that at least one set of the first connection hole (111) and the second connection hole (112) is provided on each of both sides of the connection frame (11) in a width direction of the sub-arm main body (1); the jackscrew mechanism (2) is arranged between the first connecting hole (111) and the second connecting hole (112) of each group.

11. A crane comprising a fly jib according to any one of claims 1 to 10.

12. A method for unfolding an auxiliary arm, wherein the auxiliary arm is the auxiliary arm according to any one of claims 1 to 10, and the method for unfolding the auxiliary arm comprises the following steps:

the auxiliary arm is rotatably connected around the first support until the first connecting hole and the second connecting hole which are positioned on one side of the auxiliary arm in the width direction are aligned with the inserting holes of the respective main arms; the main arm is provided with two coaxial plug holes on each side along the width direction of the main arm; the first support is arranged on the main arm, and the auxiliary arm is rotatably connected with the first support;

13. The method of deploying an auxiliary arm according to claim 12, further comprising the steps of:

14. A method of retracting an auxiliary jib according to any one of claims 1 to 10, comprising the steps of:

a driving mechanism for driving the screw jacking mechanism at one side of the auxiliary arm far away from the first bracket, so that the first shaft and the second shaft driven by the driving mechanism are retracted to disconnect the auxiliary arm from the main arm; wherein the first support is fixed to the main arm;

connecting the secondary arm to the first support;

continuing to rotate the secondary arm so that the secondary arm is adjacent to a second bracket mounted to the primary arm; wherein the second bracket and the first bracket are arranged at intervals;

connecting the secondary arm to the second bracket.