CN217921202U - Multi-section-arm synchronous telescopic mechanism and crane - Google Patents

Abstract

The utility model discloses a multi-section arm synchronous telescopic mechanism and a crane, which comprises a first arm stretching rope, a second arm stretching rope, a telescopic device, a knuckle arm assembly and an arm stretching steering assembly arranged on the knuckle arm assembly; the arm assembly comprises a basic arm, a second arm, a third arm, a fourth arm and a fifth arm which are sequentially nested, the movable tail end of the telescopic device is connected with the basic arm, the fixed tail end of the telescopic device is connected with the second arm, a first extending arm steering piece is installed at the fixed front end of the telescopic device, one end of a first extending arm rope is fixedly connected with the basic arm, the other end of the first extending arm rope is fixedly connected with the third arm after being wound with the first extending arm steering piece, one end of a second extending arm rope is fixedly connected with the second arm, and the other end of the second extending arm rope is fixedly connected with the fourth arm after being wound with the extending arm steering assembly. The utility model provides an among the prior art five sections arm crane cost higher, flexible efficiency is lower, seriously restricts the technical problem who lifts by crane weight.

Description

Multi-section-arm synchronous telescopic mechanism and crane

Technical Field

The utility model relates to a synchronous telescopic machanism of multisection arm and hoist belongs to hoist technical field.

Background

At present, most of the five-section arm cranes in the market mainstream adopt a double-cylinder rope row type telescopic mechanism, a first telescopic oil cylinder controls a two-section arm to independently extend and retract, a second telescopic oil cylinder controls a three-section arm, a four-section arm and a five-section arm to extend and retract, the efficiency is low, and the lifting weight under the working condition of large arm length is seriously influenced due to the fact that two telescopic oil cylinders are arranged, the weight is heavy and the cost is high; although some five-section arm cranes adopt single-cylinder rope row type telescopic mechanisms, when lifting weight, the stress of the four-section arm extending rope is twice that of the five-section arm extending rope, the stress of the three-section arm extending rope is twice that of the four-section arm extending rope, the stress of the rope is doubled and increased, and the crane lifting weight is severely limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome not enough among the prior art, provide a synchronous telescopic machanism of multisection arm and hoist, it is higher to solve five sections arm hoist costs among the prior art, and flexible efficiency is lower, seriously restricts the technical problem who lifts by crane weight.

In order to solve the technical problem, the utility model discloses an adopt following technical scheme to realize:

on one hand, the utility model provides a multi-section arm synchronous telescopic mechanism, which comprises a first arm extending rope, a second arm extending rope, a telescopic device, a knuckle arm assembly and an arm extending steering assembly arranged on the knuckle arm assembly; the knuckle arm assembly comprises a basic arm, a second knuckle arm, a third knuckle arm, a fourth knuckle arm and a fifth knuckle arm which are sequentially nested, the movable tail end of the telescopic device is connected with the basic arm, the fixed tail end of the telescopic device is connected with the second knuckle arm, a first extending arm steering piece is installed at the fixed front end of the telescopic device, one end of a first extending arm rope is fixedly connected with the basic arm, the other end of the first extending arm rope is fixedly connected with the third knuckle arm after being wound on the first extending arm steering piece, one end of a second extending arm rope is fixedly connected with the second knuckle arm, and the other end of the second extending arm rope is fixedly connected with the fourth knuckle arm after being wound on the extending arm steering assembly.

Furthermore, the movable end of the telescopic device is connected with the arm tail of the basic arm, the fixed end of the telescopic device is connected with the arm tail of the two-section arm, one end of the first arm stretching rope is fixedly connected with the arm tail of the basic arm, the other end of the first arm stretching rope is fixedly connected with the arm tail of the three-section arm after being wound with the first arm stretching steering piece, one end of the second arm stretching rope is fixedly connected with the arm tail of the two-section arm, and the other end of the second arm stretching rope is fixedly connected with the arm head of the four-section arm after being wound with the arm stretching steering assembly.

Furthermore, the boom extending steering assembly comprises a second boom extending steering piece, a third boom extending steering piece, a fourth boom extending steering piece, a fifth boom extending steering piece and a sixth boom extending steering piece, wherein the second boom extending steering piece is installed on a basic boom, the third boom extending steering piece is installed on a third-joint boom, the fourth boom extending steering piece is installed on a fourth-joint boom, the fifth boom extending steering piece is installed on the fourth-joint boom, the sixth boom extending steering piece is installed on the fifth-joint boom, and the other end of the second boom extending rope is sequentially wound on the second boom extending steering piece, the third boom extending steering piece, the fourth boom extending steering piece, the fifth boom extending steering piece and the sixth boom extending steering piece and then is fixedly connected with the fourth-joint boom.

Furthermore, the second stretching steering piece is installed at the arm tail of the basic arm, the third stretching steering piece is installed at the arm head of the three-section arm, the fourth stretching steering piece is installed at the arm tail of the four-section arm, the fifth stretching steering piece is installed at the arm head of the four-section arm, the sixth stretching steering piece is installed at the arm tail of the five-section arm, and the other end of the second stretching rope is sequentially wound around the second stretching steering piece, the third stretching steering piece, the fourth stretching steering piece, the fifth stretching steering piece and the sixth stretching steering piece and then is fixedly connected with the arm head of the four-section arm.

Further, still include first arm rope, the second arm rope and the third arm rope that contracts of contracting, first arm steering spare that contracts is installed to the arm tail of two sections arm, the one end of first arm rope that contracts links firmly the arm head of basic arm, the other end of first arm rope that contracts links firmly the arm tail of three sections arm after establishing first arm steering spare, the second arm steering spare that contracts is installed to the arm tail of three sections arm, the one end of second arm rope that contracts links firmly the fixed front end of telescoping device, the other end of second arm rope that contracts links firmly the arm tail of four sections arm after establishing second arm steering spare that contracts, the arm tail of four sections arm is installed the third arm steering spare that contracts, the one end of third arm rope that contracts links firmly the arm head of three sections arm, the other end of third arm rope that contracts establishes the arm tail of five sections arm after the third arm steering spare that contracts.

Further, the telescopic arm device further comprises a fourth telescopic arm rope, a fifth telescopic arm rope and a sixth telescopic arm rope, wherein a fourth telescopic arm steering piece is installed at the arm tail of the two sections of arms, one end of the fourth telescopic arm rope is fixedly connected with the arm head of the basic arm, the other end of the fourth telescopic arm rope is fixedly connected with the arm tail of the three sections of arms after being wound on the fourth telescopic arm steering piece, the fifth telescopic arm steering piece is installed at the arm tail of the three sections of arms, one end of the fifth telescopic arm rope is fixedly connected with the arm head of the two sections of arms, the other end of the fifth telescopic arm rope is fixedly connected with the arm tail of the four sections of arms after being wound on the fifth telescopic arm steering piece, the sixth telescopic arm steering piece is installed at the arm tail of the four sections of arms, one end of the sixth telescopic arm rope is fixedly connected with the arm head of the three sections of arms, and the other end of the sixth telescopic arm rope is fixedly connected with the arm tail of the five sections of the fifth telescopic arm steering piece after being wound on the sixth telescopic arm steering piece.

Furthermore, a first connecting seat is installed at the arm tail of the basic arm, the movable tail end of the telescopic device is hinged to the first connecting seat through a pin shaft, a second connecting seat is installed at the arm tail of the two-section arm, and the fixed tail end of the telescopic device is hinged to the second connecting seat through a pin shaft.

Furthermore, the telescopic device is a telescopic oil cylinder, the lever end of the telescopic oil cylinder is a movable end of the telescopic device, the cylinder end of the telescopic oil cylinder is a fixed end of the telescopic device, and the front end of the cylinder of the telescopic oil cylinder is a fixed front end of the telescopic device.

Furthermore, the first arm extending steering piece, the second arm extending steering piece, the third arm extending steering piece, the fourth arm extending steering piece, the fifth arm extending steering piece, the sixth arm extending steering piece, the first arm retracting steering piece, the second arm retracting steering piece and the third arm retracting steering piece are pulleys.

Furthermore, the fourth arm retracting steering piece, the fifth arm retracting steering piece and the sixth arm retracting steering piece are pulleys.

On the other hand, the utility model also provides a hoist, including foretell multisection arm synchronous telescoping mechanism.

Compared with the prior art, the utility model discloses the beneficial effect who reaches is:

by arranging the first boom steering piece, the first boom rope wound on the first boom steering piece, the boom steering assembly and the second boom rope wound on the boom steering assembly, the stress of the first boom rope and the second boom rope of the boom assembly in a boom state is effectively reduced, and the hoisting weight of the crane is greatly improved;

the synchronous telescoping of two sections of arms, three sections of arms, four sections of arms and five sections of arms is realized through reducing the quantity of telescoping devices, so that the whole weight and the cost of the multi-section-arm synchronous telescoping mechanism are effectively reduced, and the telescoping efficiency among the sections of arms can be effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of a multi-arm synchronous telescopic mechanism according to an embodiment of the present invention;

fig. 2 is another schematic structural diagram of a multi-arm synchronous telescopic mechanism according to an embodiment of the present invention;

in the figure: 1. a second boom steering member; 2. a base arm; 3. a second telescopic arm steering member; 4. a two-section arm; 5. a second arm retracting rope; 6. a fourth boom steering member; 7. a three-section arm; 8. a third boom steering member; 9. a sixth boom steering element; 10. a four-section arm; 11. a second arm-extending rope; 12. a fifth boom steering member; 13. a five-section arm; 14. a third arm retracting rope; 15. a third telescopic arm steering member; 16. a first boom steering member; 17. a first arm-extending rope; 18. a first arm retracting rope; 19. a first boom retraction jack; 20. a telescopic device; 21. a first connecting seat; 22. a second connecting seat; 23. a fourth telescopic arm steering member; 24. a fourth arm retracting rope; 25. a fifth boom retraction steering member; 26. a fifth arm retracting rope; 27. a sixth boom retraction steering member; 28. and a sixth arm retracting rope.

Detailed Description

The present invention will be further described with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1:

as shown in fig. 1, an embodiment of the present invention provides a multi-arm synchronous telescopic mechanism, which includes a first arm-extending rope 17, a second arm-extending rope 11, a telescopic device 20, a knuckle arm assembly, and an arm-extending steering assembly mounted on the knuckle arm assembly;

the arm assembly comprises a basic arm 2, a two-section arm 4, a three-section arm 7, a four-section arm 10 and a five-section arm 13 which are sequentially nested, in the embodiment, the five-section arm 13 is nested in the four-section arm 10, the four-section arm 10 is nested in the three-section arm 7, the three-section arm 7 is nested in the two-section arm 4, and the two-section arm 4 is nested in the basic arm 2. The activity end of telescoping device 20 links to each other with the arm tail of basic arm 2, the fixed end of telescoping device 20 links to each other with the arm tail of two sections arm 4, specifically, first connecting seat 21 is installed to the arm tail of basic arm 2, the activity end of telescoping device 20 is articulated with first connecting seat 21 through the round pin axle, second connecting seat 22 is installed to the arm tail of two sections arm 4, the fixed end of telescoping device 20 is articulated with second connecting seat 22 through the round pin axle, in this embodiment, first connecting seat 21 is installed in the arm tail of basic arm 2 inboard, second connecting seat 22 is installed in the arm tail of two sections arm 4 inboard. First boom steering 16 is installed to telescoping device 20's fixed front end, and the one end fixed connection of first boom rope 17 is inboard at the arm tail of basic arm 2, and the other end of first boom rope 17 is inboard around the arm tail of establishing first boom steering 16 back fixed connection three section arm 7, and the one end fixed connection two section arm 4's the arm tail outside of second boom rope 11 is stretched to the second, and the other end that the second was stretched boom rope 11 is inboard around the arm head of establishing boom steering assembly back fixed connection four section arm 10. Specifically, the boom steering assembly includes a second boom steering element 1, a third boom steering element 8, a fourth boom steering element 6, a fifth boom steering element 12 and a sixth boom steering element 9, in this embodiment, the second boom steering element 1 is installed inside the arm end of the basic arm 2, the third boom steering element 8 is installed inside the arm head of the three-section arm 7, the fourth boom steering element 6 is installed outside the arm end of the four-section arm 10, the fifth boom steering element 12 is installed inside the arm head of the four-section arm 10, the sixth boom steering element 9 is installed outside the arm end of the five-section arm 13, it should be noted that the other end of the second boom rope 11 is sequentially wound around the second boom steering element 1, the third boom steering element 8, the fourth boom steering element 6, the fifth boom steering element 12 and the sixth boom steering element 9 and then fixedly connected inside the arm head of the four-section arm 10.

In application, when the telescopic device 20 extends, the fixed end of the telescopic device 20 drives the second-section arm 4 to extend outwards, the third-section arm 7 is driven to extend outwards under the action of the first arm extending rope 17 and the first arm extending steering piece 16, and the fourth-section arm 10 and the fifth-section arm 13 are driven to extend outwards synchronously under the action of the second arm extending rope 11, the second arm extending steering piece 1, the third arm extending steering piece 8, the fourth arm extending steering piece 6, the fifth arm extending steering piece 12 and the sixth arm extending steering piece 9. During the lifting, if the load that the arm head of the five-section arm 13 receives is T, the stress of the second arm stretching rope 11 is T/2, and because the second arm stretching rope 11 simultaneously drives the four-section arm 10 and the five-section arm 13 to extend outwards, the stress of the second arm stretching rope 11 is not doubled, and the first arm stretching rope 17 drives the three-section arm 7 to extend outwards, so the stress of the first arm stretching rope 17 is T. The utility model discloses a set up first arm that stretches to turn to 16, stretch arm rope 17 around locating the first arm that stretches on the arm turns to 16, stretch arm steering assembly and stretch arm rope 11 around locating the second that stretches on the arm steering assembly, effectively reduced the first arm rope 17 and the second of stretching of festival arm subassembly under stretching the arm state and stretched arm rope 11's atress, greatly promoted the weight of lifting of hoist.

Optionally, as shown in fig. 1, the utility model provides a pair of synchronous telescopic machanism of multijoint arm still includes first arm rope 18 that contracts, second arm rope 5 and the third arm rope 14 that contracts, it is specific, first arm steering piece 19 that contracts is installed in the arm tail outside of two section arms 4, the arm head inboard of basic arm 2 of one end fixed connection of first arm rope 18 that contracts, the other end of first arm rope 18 that contracts is around establishing the arm tail outside of first arm steering piece 19 back fixed connection three section arms 7, second arm steering piece 3 that contracts is installed in the arm tail outside of three section arms 7, the fixed front end of one end fixed connection telescoping device 20 of second arm rope 5 that contracts, the arm tail outside of fixed connection four section arms 10 behind the second arm steering piece 3 that contracts is wound to the other end of second arm rope 5, third arm steering piece 15 that contracts is installed in the arm tail outside of four section arms 10, the one end fixed connection three arm 7's of third arm rope 14 that contracts is surveyed in the arm head of arm rope, the arm rope 14 that contracts is around establishing the arm steering piece 13 outside of the arm steering piece that contracts.

In application, when the telescopic device 20 is contracted, the fixed end of the telescopic device 20 drives the two-section arm 4 to contract inwards, the three-section arm 7 is driven to contract inwards under the action of the first arm contracting rope 18 and the first arm contracting steering piece 19, the four-section arm 10 is driven to contract inwards under the action of the second arm contracting rope 5 and the second arm contracting steering piece 3, and the five-section arm 13 is driven to contract inwards under the action of the third arm contracting rope 14 and the third arm contracting steering piece 15.

Optionally, as shown in fig. 2, the utility model provides a pair of multi-section arm synchronous telescoping mechanism still includes the fourth arm rope 24 that contracts, fifth arm rope 26 and sixth arm rope 28 that contracts, the fourth arm steering piece 23 that contracts is installed in the arm tail outside of two section arms 4, the arm head of the one end fixed connection basic arm of fourth arm rope 24 that contracts is inboard, the arm tail outside of fixedly connected three section arms 7 behind the fourth arm steering piece 23 is established in the other end of fourth arm rope 24 that contracts in a winding manner, fifth arm steering piece 25 that contracts is installed in the arm tail outside of three section arms 7, the arm head of one end fixed connection two section arms 4 of fifth arm rope 26 is inboard, the arm tail outside of fixedly connected four section arms 10 behind fifth arm steering piece 25 is established in the other end of fifth arm rope 26 that contracts in a winding manner, sixth arm steering piece 27 is installed to the arm tail of four section arms 10, the one end fixed connection three section arms 7 of sixth arm rope 28 that contracts in an inboard, the other end of sixth arm rope 28 that contracts in a winding manner establishes the arm steering piece 13 that contracts in the arm steering piece that contracts in the arm 13 the arm after the sixth arm steering piece 27.

In application, when the telescopic device 20 contracts, the fixed end of the telescopic device 20 drives the two-section arm 4 to contract inwards, the three-section arm 7 is driven to contract inwards under the action of the fourth arm contraction rope 24 and the fourth arm contraction steering piece 23, the four-section arm 10 is driven to contract inwards under the action of the fifth arm contraction rope 26 and the fifth arm contraction steering piece 25, and the five-section arm 13 is driven to contract inwards under the action of the sixth arm contraction rope 28 and the sixth arm contraction steering piece 27.

In an embodiment, the telescopic device 20 is a telescopic cylinder, and it should be noted that in this embodiment, a lever end of the telescopic cylinder is a movable end of the telescopic device 20, a cylinder end of the telescopic cylinder is a fixed end of the telescopic device 20, and a cylinder front end of the telescopic cylinder is a fixed front end of the telescopic device 20.

In one embodiment, the first arm extension rope 17, the second arm extension rope 11, the first arm retraction rope 18, the second arm retraction rope 5, the third arm retraction rope 14, the fourth arm retraction rope 24, the fifth arm retraction rope 26 and the sixth arm retraction rope 28 are guy ropes.

In one embodiment, the first boom steering element 16, the second boom steering element 1, the third boom steering element 8, the fourth boom steering element 6, the fifth boom steering element 12, the sixth boom steering element 9, the first boom retracting steering element 19, the second boom retracting steering element 3, the third boom retracting steering element 15, the fourth boom retracting steering element 23, the fifth boom retracting steering element 25 and the sixth boom retracting steering element 27 are pulleys.

Example 2:

the embodiment of the utility model provides a still provide a hoist, including aforementioned multinode arm synchronous telescopic machanism. Since the technical improvement and the technical effect of the crane are the same as those of the multi-section arm synchronous telescopic mechanism, the detailed description of the crane is omitted.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims (11)

1. A multi-section arm synchronous telescopic mechanism is characterized by comprising a first arm extending rope, a second arm extending rope, a telescopic device, a knuckle arm assembly and an arm extending steering assembly arranged on the knuckle arm assembly; the knuckle arm assembly comprises a basic arm, a second knuckle arm, a third knuckle arm, a fourth knuckle arm and a fifth knuckle arm which are sequentially nested, the movable tail end of the telescopic device is connected with the basic arm, the fixed tail end of the telescopic device is connected with the second knuckle arm, a first extending arm steering piece is installed at the fixed front end of the telescopic device, one end of a first extending arm rope is fixedly connected with the basic arm, the other end of the first extending arm rope is fixedly connected with the third knuckle arm after being wound on the first extending arm steering piece, one end of a second extending arm rope is fixedly connected with the second knuckle arm, and the other end of the second extending arm rope is fixedly connected with the fourth knuckle arm after being wound on the extending arm steering assembly.

2. The multi-section arm synchronous telescoping mechanism of claim 1, wherein the movable end of the telescoping device is connected with the arm tail of the basic arm, the fixed end of the telescoping device is connected with the arm tail of the two-section arm, one end of the first boom extension rope is fixedly connected with the arm tail of the basic arm, the other end of the first boom extension rope is fixedly connected with the arm tail of the three-section arm after being wound with the first boom extension steering piece, one end of the second boom extension rope is fixedly connected with the arm tail of the two-section arm, and the other end of the second boom extension rope is fixedly connected with the arm head of the four-section arm after being wound with the boom extension steering assembly.

3. The multi-boom synchronous telescoping mechanism of claim 2, wherein the boom steering assembly comprises a second boom steering member, a third boom steering member, a fourth boom steering member, a fifth boom steering member and a sixth boom steering member, the second boom steering member is mounted on the basic boom, the third boom steering member is mounted on the three-section boom, the fourth boom steering member is mounted on the four-section boom, the fifth boom steering member is mounted on the four-section boom, the sixth boom steering member is mounted on the five-section boom, and the other end of the second boom rope is sequentially wound around the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member and the sixth boom steering member and then fixedly connected with the four-section boom.

4. The multi-section synchronous telescopic mechanism of claim 3, wherein the second boom steering element is mounted on the tail of the basic boom, the third boom steering element is mounted on the head of the three-section boom, the fourth boom steering element is mounted on the tail of the four-section boom, the fifth boom steering element is mounted on the head of the four-section boom, the sixth boom steering element is mounted on the tail of the five-section boom, and the other end of the second boom rope is sequentially wound with the second boom steering element, the third boom steering element, the fourth boom steering element, the fifth boom steering element and the sixth boom steering element and then fixedly connected with the head of the four-section boom.

5. The multi-arm synchronous telescoping mechanism of claim 4, further comprising a first arm retracting rope, a second arm retracting rope and a third arm retracting rope, wherein a first arm retracting steering member is mounted at the arm tail of the two-section arm, one end of the first arm retracting rope is fixedly connected with the arm head of the basic arm, the other end of the first arm retracting rope is fixedly connected with the arm tail of the three-section arm after being wound on the first arm retracting steering member, a second arm retracting steering member is mounted at the arm tail of the three-section arm, one end of the second arm retracting rope is fixedly connected with the fixed front end of the telescoping device, the other end of the second arm retracting rope is fixedly connected with the arm tail of the four-section arm after being wound on the second arm retracting steering member, a third arm retracting steering member is mounted at the arm tail of the four-section arm, one end of the third arm retracting rope is fixedly connected with the arm head of the three-section arm, and the other end of the third arm retracting rope is fixedly connected with the arm tail of the five-section arm after being wound on the third arm steering member.

6. The multi-section arm synchronous telescoping mechanism according to claim 4, further comprising a fourth arm retracting rope, a fifth arm retracting rope and a sixth arm retracting rope, wherein a fourth arm retracting steering member is installed at the arm tail of the two-section arm, one end of the fourth arm retracting rope is fixedly connected with the arm head of the base arm, the other end of the fourth arm retracting rope is fixedly connected with the arm tail of the three-section arm after being wound around the fourth arm retracting steering member, a fifth arm retracting steering member is installed at the arm tail of the three-section arm, one end of the fifth arm retracting rope is fixedly connected with the arm head of the two-section arm, the other end of the fifth arm retracting rope is fixedly connected with the arm tail of the four-section arm after being wound around the fifth arm retracting steering member, a sixth arm retracting steering member is installed at the arm tail of the four-section arm, one end of the sixth arm retracting rope is fixedly connected with the arm head of the three-section arm, and the other end of the sixth arm retracting rope is fixedly connected with the arm tail of the fifth arm after being wound around the sixth arm retracting steering member.

7. The multi-arm synchronous telescoping mechanism of claim 1, wherein the arm tail of the basic arm is provided with a first connecting seat, the movable end of the telescoping device is hinged with the first connecting seat through a pin shaft, the arm tail of the two-section arm is provided with a second connecting seat, and the fixed end of the telescoping device is hinged with the second connecting seat through a pin shaft.

8. The multi-arm synchronous telescoping mechanism of claim 1, wherein the telescoping device is a telescoping cylinder, the lever end of the telescoping cylinder is the movable end of the telescoping device, the cylinder end of the telescoping cylinder is the fixed end of the telescoping device, and the front end of the cylinder of the telescoping cylinder is the fixed front end of the telescoping device.

9. The multi-boom synchronous telescoping mechanism of claim 5, wherein the first boom steering member, the second boom steering member, the third boom steering member, the fourth boom steering member, the fifth boom steering member, the sixth boom steering member, the first boom retracting steering member, the second boom retracting steering member and the third boom retracting steering member are pulleys.

10. The multi-boom synchronous telescoping mechanism of claim 6, wherein the fourth boom retraction jack, the fifth boom retraction jack and the sixth boom retraction jack are pulleys.

11. A crane comprising a multi-jointed boom synchronous telescoping mechanism of any of claims 1-10.

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