CN212450382U

CN212450382U - Boom assembly and work vehicle

Info

Publication number: CN212450382U
Application number: CN202021709449.2U
Authority: CN
Inventors: 陈强; 邓彪
Original assignee: Sany Automobile Manufacturing Co Ltd
Current assignee: Sany Automobile Manufacturing Co Ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-02-02
Anticipated expiration: 2030-08-17

Abstract

The utility model provides a cantilever crane subassembly and working vehicle. Wherein, the cantilever crane subassembly includes: a first arm support; one end of the first arm support is rotatably connected with one end of the second arm support; the first driving device is respectively and rotatably connected with the first arm support and the second arm support and is used for driving the second arm support to rotate relative to the first arm support; in a folded state, the second arm support is located on the side of the first arm support, and projections of the first arm support and the second arm support on a horizontal plane are not overlapped. The utility model provides a boom assembly compares with the correlation technique, has reduced the whole height of boom assembly, can nimble operation, the operation of lying flat even, can realize the accurate operation of putting out a fire under the complex environment.

Description

Boom assembly and work vehicle

Technical Field

The utility model belongs to the vehicle field particularly, relates to an arm frame subassembly and an operation vehicle.

Background

At present, the structural form of an arm support of a high-spraying fire truck is mainly a fully-folded arm structure, and in the fully-folded arm structure, one section of arm support needs to be arranged above the other section of arm support. Based on the fire engine design standard, the driving height of high-pressure jetting fire engine has certain requirement, and the high-pressure jetting fire engine adopting the full-folding-arm structure can exceed the required driving height, has ultrahigh risk, and is not favorable for the boom to lie flat.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art or the correlation technique.

To this end, a first aspect of the present invention provides an arm rest assembly.

A second aspect of the present invention provides an operating vehicle.

In view of this, according to the utility model discloses a first aspect provides an arm frame subassembly, includes: a first arm support; one end of the first arm support is rotatably connected with one end of the second arm support; the first driving device is respectively and rotatably connected with the first arm support and the second arm support and is used for driving the second arm support to rotate relative to the first arm support; in a folded state, the second arm support is located on the side of the first arm support, and projections of the first arm support and the second arm support on a horizontal plane are not overlapped.

The utility model provides an arm frame subassembly, arm frame subassembly include first cantilever crane and second cantilever crane, the one end and the second cantilever crane rotatable coupling of first cantilever crane, the other end of first cantilever crane is used for being connected with the vehicle, has realized being connected of arm frame subassembly and vehicle. The first driving device is respectively and rotatably connected with the first arm support and the second arm support and is used for driving the second arm support to rotate relative to the first arm support, so that the two sections of arm supports can be changed between an opening state and a folding state. In a folded state, the second arm support is located on the side of the first arm support, and the projections of the two arm supports on the horizontal plane are not overlapped. Compare in the correlation technique with a section of cantilever crane setting in another section of cantilever crane top, the utility model provides a cantilever crane subassembly height is lower, is applied to the vehicle back, and the vehicle can not have super high risk, has reduced cantilever crane subassembly's whole height, and under the expansion state, cantilever crane subassembly can nimble operation, and the operation of putting out a fire of the accurate under the complex environment can be realized to the operation of lying prone even.

In addition, according to the utility model provides an arm frame subassembly among the above-mentioned technical scheme can also have following additional technical characteristics:

in one possible design, the boom assembly further includes: the first driving device is respectively and rotatably connected with the biasing mechanism and the second arm support, and the second arm support is connected with the biasing mechanism and is different from the extending direction of the first arm support.

In the design, the biasing mechanism comprises a first arm head and a second arm head, the first arm head is connected with the first arm support, the second arm head is rotatably connected with the first driving device, and the first driving device is further rotatably connected with the second arm support. The second arm head and the first arm head can rotate relatively, so that the extending directions of the second arm support and the first arm support are different, the second arm support is located on the side of the first arm support in a folded state, the space on the side of the first arm support is effectively utilized, and the structural compactness of the arm support assembly is improved.

In one possible design, the boom assembly further includes: and the third arm frame is rotatably connected with the second arm frame, and is positioned above the second arm frame in a folded state, and the projections of the third arm frame and the second arm frame on the horizontal plane are at least partially overlapped.

In the design, the third arm support and the second arm support are rotatably connected, so that the extension coverage range of the arm support assembly is enlarged. Generally speaking, in a folded state, the heights of the second arm support and the third arm support are both smaller than the height of the first arm support, the third arm support is arranged above the second arm support, and the projections of the third arm support and the second arm support on the horizontal plane are at least partially overlapped, so that the overall height of the arm support assembly is not affected, the structure of the arm support assembly is optimized, and the arm support assembly can meet the requirements of various working conditions.

In one possible embodiment, the first drive device is rotatably connected to the second arm support and the third arm support, respectively, for driving the third arm support to rotate relative to the second arm support.

In the design, the first driving device is respectively rotatably connected with the second arm support and the third arm support and used for driving the third arm support to rotate relative to the second arm support, so that the two sections of arm supports can be changed between an opening state and a folding state, the extension coverage range of the arm support assembly is enlarged, the structure of the arm support assembly is optimized, and the arm support assembly can meet various working condition requirements.

In one possible design, the boom assembly further includes: the fourth arm support is rotatably connected with the third arm support, in a folded state, the extension directions of the third arm support and the fourth arm support are parallel, the fourth arm support is positioned on the side of the third arm support, and the projections of the fourth arm support and the third arm support on the horizontal plane are not overlapped.

In the design, the fourth arm support and the third arm support are rotatably connected, so that the extension coverage range of the arm support assembly is further expanded, and the operation without dead angles in the whole range can be easily realized. Specifically, when the arm support assembly is in the unfolded state, the four-section arm support is positively folded into the folded state through an R-shaped structure. In a folded state, the extending directions of the fourth arm support and the third arm support are parallel, the fourth arm support is positioned on the side of the third arm support, and the projections of the fourth arm support and the third arm support on the horizontal plane are at least partially overlapped, so that the structure of the arm support assembly is optimized, and the arm support assembly can meet the requirements of various working conditions.

In one possible design, the first driving device is rotatably connected to the third arm support and the fourth arm support respectively, and is configured to drive the fourth arm support to rotate relative to the third arm support.

In the design, the first driving device is respectively rotatably connected with the third arm support and the fourth arm support and used for driving the fourth arm support to rotate relative to the third arm support, so that the two sections of arm supports can be changed between an opening state and a folding state, the extension coverage range of the arm support assembly is enlarged, the structure of the arm support assembly is optimized, and the arm support assembly can meet various working condition requirements.

In one possible design, the first drive means is a hydraulic ram comprising: a cylinder body; the rod piece is rotatably connected with the biasing mechanism, and the cylinder body is rotatably connected with the second arm support; an arm frame assembly, further comprising: and the connecting rod is respectively and rotatably connected with the biasing mechanism and the second arm support. In this design, hydraulic cylinder's cylinder body drive member is flexible, changes the angle between the adjacent two sections jibs, and then changes jib subassembly's working range for jib subassembly can nimble operation, and the practicality is stronger. The connecting rod is respectively and rotatably connected with the biasing mechanism and the second arm support, so that the arm support assembly can operate flexibly.

In one possible design, the first boom is a telescopic boom.

In this design, be flexible arm frame design for flexible arm, increased the work coverage of cantilever crane subassembly by a wide margin for the cantilever crane subassembly can realize the high operation that spouts of super large span, compares with the correlation technique, and the operation is more nimble, and the shared space of flexible arm under the recovery state is less, reduces the space demand of cantilever crane subassembly.

A second aspect of the present invention provides an operating vehicle, including: a vehicle body; the boom assembly of any of the above claims; the swivel base is arranged on the vehicle body and is rotatably connected with the arm frame assembly; the second driving device is arranged at the joint of the arm support assembly and the rotary seat and is close to the joint, the arm support assembly and the rotary seat are connected through the second driving device respectively, and the arm support assembly can rotate relative to the rotary seat under the driving of the second driving device.

The utility model provides an operation vehicle owing to have the jib subassembly as above-mentioned any one in the technical scheme, and then has the beneficial effect of above-mentioned any one, differs here and a perusal. In addition, pass through the swivel mount setting with the jib subassembly on the automobile body, the jib subassembly can rotate along with the swivel mount, the extension coverage of jib subassembly has been enlarged, still drive the jib subassembly through the second drive arrangement and change between open mode and fold condition, be in open mode when the jib subassembly, the jib subassembly can nimble operation, the operation of leveling of lying prone even, can realize the accurate operation of putting out a fire under the complex environment, be in fold condition when the jib subassembly, the overall arrangement of vehicle is compact, can not lead to the vehicle superelevation.

In one possible design, the work vehicle further includes: the waterway system is arranged on the vehicle body; the boom pipeline system is arranged on the boom component and arranged along the length direction of the boom component; the fire monitor is arranged at the tail end of the arm frame assembly and is connected with the waterway system through the arm frame pipeline system; the supporting seat is arranged on the vehicle body and used for supporting the frame component in a folded state.

In this design, be provided with waterway system on the automobile body, be provided with the fire gun on the end of cantilever crane subassembly, the fire gun passes through cantilever crane pipe-line system and waterway system connection to realize the operation of putting out a fire of high-pressure jetting fire engine, still be provided with the supporting seat on the automobile body, be in fold condition, cantilever crane subassembly falls on the supporting seat naturally, realizes the support to cantilever crane subassembly through the supporting seat, avoids cantilever crane subassembly landing.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

figure 1 shows a front view of an arm support assembly of an embodiment of the present invention in an expanded state;

FIG. 2 shows an enlarged view of portion A of FIG. 1;

FIG. 3 shows an enlarged view of portion B of FIG. 1;

FIG. 4 shows an enlarged view of portion C of FIG. 1;

figure 5 illustrates a top view of the boom assembly of an embodiment of the present invention in a folded state;

fig. 6 shows a schematic structural diagram of a vehicle according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:

the hydraulic boom system comprises a 100 boom assembly, a 102 first driving device, a 104 first boom, a 106 second boom, a 108 biasing mechanism, a 110 third boom, a 112 fourth boom, a 114 cylinder, a 116 rod, a 118 connecting rod, a 200 vehicle body, a 300 swivel base, a 400 second driving device, a 500 waterway system, a 600 fire monitor, a 700 supporting seat and a 800 boom pipeline system.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Boom assemblies and work vehicles according to some embodiments of the present invention are described below with reference to fig. 1-6.

The first embodiment is as follows:

as shown in fig. 1 to 5, an arm rest assembly 100 includes: a first boom 104; one end of the first arm support 104 is rotatably connected with one end of the second arm support 106; the first driving device 102 is rotatably connected with the first arm support 104 and the second arm support 106 respectively, and is used for driving the second arm support 106 to rotate relative to the first arm support 104; in a folded state, the second arm support 106 is located at a side of the first arm support 104, and projections of the first arm support and the second arm support on a horizontal plane are not overlapped.

The utility model provides a boom assembly 100, boom assembly 100 include first cantilever crane 104 and second cantilever crane 106, the one end and the second cantilever crane 106 rotatable coupling of first cantilever crane 104, the other end of first cantilever crane 104 is used for being connected with the vehicle, has realized being connected of boom assembly 100 and vehicle. The first driving device 102 is rotatably connected to the first arm 104 and the second arm 106, respectively, and is configured to drive the second arm 106 to rotate relative to the first arm 104, so that the two-section arm can be changed between an open state and a folded state. In the folded state, the second arm 106 is located at the side of the first arm 104, and the projections of the two sections of arms on the horizontal plane are not overlapped. Compare in the correlation technique with a section of cantilever crane setting in another section of cantilever crane top, the utility model provides a cantilever crane subassembly 100 is highly lower, be applied to the vehicle after, the vehicle can not have super high risk, has promoted cantilever crane subassembly 100's compact structure degree, has reduced cantilever crane subassembly 100's whole height, under the expansion state, cantilever crane subassembly 100 can nimble operation, the flat operation of lying prone even, can realize the accurate operation of putting out a fire under the complex environment, preferably, set up cantilever crane subassembly 100 back on the vehicle, the vehicle is not higher than 4 m.

Example two:

as shown in fig. 2, on the basis of the first embodiment, the boom assembly 100 further includes: the biasing mechanism 108 is connected to the first arm support 104, the first driving device 102 is rotatably connected to the biasing mechanism 108 and the second arm support 106, and the second arm support 106 is connected to the biasing mechanism 108 so as to be different from the first arm support 104 in the extending direction.

In this embodiment, the biasing mechanism 108 includes a first arm head coupled to the first arm support 104 and a second arm head rotatably coupled to the first drive 102, and the first drive 102 is further rotatably coupled to the second arm support 106. The second arm head and the first arm head can rotate relatively, so that the extending directions of the second arm support 106 and the first arm support 104 are different, and the second arm support 106 is located on the side of the first arm support 104 in a folded state, so that the space on the side of the first arm support 104 is effectively utilized, and the structural compactness of the arm support assembly 100 is improved.

Example three:

as shown in fig. 3, on the basis of the second embodiment, the boom assembly 100 further includes: and the third boom 110, the third boom 110 and the second boom 106 are rotatably connected, in a folded state, the third boom 110 is located above the second boom 106, and projections of the third boom 110 and the second boom 106 on a horizontal plane are at least partially overlapped.

In this embodiment, the third boom 110 is rotatably connected to the second boom 106, which enlarges the extension coverage of the boom assembly 100. Generally speaking, in a folded state, the heights of the second boom 106 and the third boom 110 are both smaller than the height of the first boom 104, the third boom 110 is disposed above the second boom 106, and projections of the third boom 110 and the second boom 106 on a horizontal plane are at least partially overlapped, so that the overall height of the boom assembly 100 is not affected, and the structure of the boom assembly 100 is optimized, so that the boom assembly 100 can meet various working condition requirements.

Example four:

on the basis of the third embodiment, it is further defined that the first driving device 102 is respectively rotatably connected to the second boom 106 and the third boom 110, and is configured to drive the third boom 110 to rotate relative to the second boom 106.

In this embodiment, the first driving device 102 is respectively rotatably connected to the second boom 106 and the third boom 110, and is configured to drive the third boom 110 to rotate relative to the second boom 106, so that the two sections of booms can be changed between an open state and a folded state, thereby expanding the extension coverage of the boom assembly 100, optimizing the structure of the boom assembly 100, and enabling the boom assembly 100 to meet various working condition requirements.

Example five:

as shown in fig. 4, on the basis of the fourth embodiment, the boom assembly 100 is further defined to further include: the fourth boom 112 is rotatably connected with the third boom 110, in a folded state, the extending directions of the third boom 110 and the fourth boom 112 are parallel, the fourth boom 112 is located at the side of the third boom 110, and the projections of the fourth boom 112 and the third boom 110 on the horizontal plane are not overlapped.

In this embodiment, the fourth boom 112 and the third boom 110 are rotatably connected, so that the extending coverage of the boom assembly 100 is further expanded, and the operation without dead angles in the whole range can be easily realized. Specifically, with the boom assembly 100 in the unfolded state, the four-section boom is folded into the folded state by the positive folding of the R-shape.

Further, in a folded state, the extending directions of the fourth boom 112 and the third boom 110 are parallel, the fourth boom 112 is located at the side of the third boom 110, and the projections of the fourth boom 112 and the third boom 110 on the horizontal plane are not overlapped, that is, when the boom assembly 100 is in the folded state, the fourth boom 112 and the third boom 110 are not folded and located above the second boom 106, or the fourth boom 112 and the third boom 110 are folded and horizontally located above the second boom 106, so that the structure of the boom assembly 100 is optimized, and the boom assembly 100 can meet the requirements of various working conditions.

Example six:

on the basis of the fifth embodiment, it is further limited that the first driving device 102 is respectively rotatably connected to the third boom 110 and the fourth boom 112, and is configured to drive the fourth boom 112 to rotate relative to the third boom 110.

In this embodiment, the first driving device 102 is respectively rotatably connected to the third boom 110 and the fourth boom 112, and is configured to drive the fourth boom 112 to rotate relative to the third boom 110, so that the two sections of the boom can be changed between an open state and a folded state, thereby expanding the extension coverage of the boom assembly 100, optimizing the structure of the boom assembly 100, and enabling the boom assembly 100 to meet various working condition requirements.

Example seven:

on the basis of the second embodiment, the first driving device 102 is further limited to be a diethylamine cylinder, and includes: a cylinder block 114; and a rod 116, the rod 116 is rotatably connected with the biasing mechanism 108, and the cylinder 114 is rotatably connected with the second arm support 106; the boom assembly 100, further comprising: and a connecting rod 118, wherein the connecting rod 118 is rotatably connected with the biasing mechanism 108 and the second arm support 106 respectively.

In this embodiment, the rod member 116 is driven to extend and contract by the cylinder body 114 of the hydraulic cylinder, so as to change the angle between two adjacent sections of booms, and further change the working range of the boom assembly 100, so that the boom assembly 100 can flexibly operate and has stronger practicability. The biasing mechanism 108 and the second boom 106 are rotatably connected to each other by a connecting rod 118, which facilitates the flexible operation of the boom assembly 100.

Example eight:

on the basis of the second embodiment, the first arm support 104 is further limited to be a telescopic arm.

In this embodiment, the first boom 104 is designed as a telescopic boom, which greatly increases the working coverage of the boom assembly 100, so that the boom assembly 100 can realize super-large-span high-spraying operation, and compared with the related art, the operation is more flexible, and the space occupied by the telescopic boom in the recovery state is smaller, thereby reducing the space requirement of the boom assembly 100.

Example nine:

as shown in fig. 6, a work vehicle includes: a vehicle body 200; the boom assembly 100 of any of the above solutions; a swivel mount 300, the swivel mount 300 is arranged on the vehicle body 200, and the swivel mount 300 is rotatably connected with the arm support assembly 100; and a second driving device 400, the second driving device 400 is disposed near a connection position between the arm frame assembly 100 and the swivel base 300, the second driving device 400 respectively connects the arm frame assembly 100 and the swivel base 300, and the arm frame assembly 100 can rotate relative to the swivel base under the driving of the second driving device 400.

The utility model provides an operating vehicle owing to have as above-mentioned any one in the technical scheme's jib subassembly 100, and then has any one of the above-mentioned technical scheme's beneficial effect, differs here and a perk. In addition, the arm support assembly 100 is arranged on the vehicle body 200 through the rotary seat 300, and the arm support assembly 100 can rotate along with the rotary seat 300, so that the extending coverage range of the arm support assembly 100 is expanded. The arm support assembly 100 is driven by the second driving device 400 to change between an open state and a folded state, specifically, the second driving device 400 is a hydraulic cylinder and comprises a cylinder body and a rod piece, the second driving device 400 is arranged at the joint of the rotary seat 300 and the first arm support 104, the cylinder body is connected with the first arm support 104, the rod piece is connected with the rotary seat 300, and the second driving device 400 drives the rod piece to extend and retract through the cylinder body to drive the first arm support 104 to change the amplitude, so that the working amplitude of the arm support assembly 100 is changed. When jib subassembly 100 is in the open mode, jib subassembly 100 can be in nimble operation, and the operation of putting out a fire of the accuracy under the complex environment can be realized to the operation of lying on the flat even, is in fold condition when jib subassembly 100, and the overall layout of vehicle is compact, can not lead to the vehicle superelevation. Preferably, in the folded state, the height of the arm support assembly 100 is less than 850mm, the length of the arm support assembly 100 is less than 10000mm, and then the height of the vehicle mounted with the arm support assembly 100 is less than 4m, and the length of the vehicle is less than 10500mm, which meets the requirements of policy and regulation.

Example ten:

on the basis of the eighth embodiment, the work vehicle is further defined to include: the waterway system 500, the waterway system 500 is arranged on the vehicle body 200; the boom pipeline system 800, the boom pipeline system 800 is arranged on the boom assembly 100 and arranged along the length direction of the boom assembly 100; the fire monitor 600, the fire monitor 600 is arranged at the tail end of the arm support assembly 100, and the fire monitor 600 is connected with the waterway system 500; the support base 700, the support base 700 is disposed on the vehicle body 200, and the support base 700 is used for supporting the arm support assembly 100.

In this embodiment, the working vehicle is a high-pressure fire truck, a waterway system is disposed on the vehicle body 200, a fire monitor 600 is disposed at the end of the boom assembly 100, and the fire monitor 600 is connected to the waterway system 500 through a boom pipeline system 800, so as to achieve fire extinguishing operation of the high-pressure fire truck. When the boom assembly 100 comprises two sections of booms, the end of the second boom 106, which is not connected with the first boom 104, is the end of the boom assembly 100, when the boom assembly 100 comprises three sections of booms, the end of the third boom 110, which is not connected with the second boom 106, is the end of the boom assembly 100, when the boom assembly 100 comprises four sections of booms, the end of the fourth boom 112, which is not connected with the third boom 110, is the end of the boom assembly 100, a support seat 700 is further arranged on the vehicle body 200, and when the vehicle body is in a folded state, the boom assembly 100 naturally falls on the support seat 700, the boom assembly 100 is supported by the support seat 700, and the boom assembly 100 is prevented from falling off.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An arm support assembly, the arm support assembly comprising:

a first arm support;

one end of the first arm support is rotatably connected with one end of the second arm support;

the first driving device is respectively and rotatably connected with the first arm support and the second arm support and is used for driving the second arm support to rotate relative to the first arm support;

in a folded state, the second arm support is located on the side of the first arm support, and projections of the first arm support and the second arm support on a horizontal plane are not overlapped.

2. The boom assembly of claim 1, wherein the boom assembly further comprises:

the first driving device is respectively and rotatably connected with the biasing mechanism and the second arm support, and the second arm support is connected with the biasing mechanism and is different from the first arm support in the extending direction.

3. The boom assembly of claim 2, wherein the boom assembly further comprises:

the third arm support is rotatably connected with the second arm support, and in a folded state, the third arm support is positioned above the second arm support, and projections of the third arm support and the second arm support on a horizontal plane are at least partially overlapped.

4. The boom assembly of claim 3, wherein,

the first driving device is respectively rotatably connected with the second arm support and the third arm support and is used for driving the third arm support to rotate relative to the second arm support.

5. The boom assembly of claim 3, further comprising:

the fourth arm support is rotatably connected with the third arm support, in a folded state, the extending directions of the third arm support and the fourth arm support are parallel, the fourth arm support is positioned on the side of the third arm support, and the projections of the fourth arm support and the third arm support on the horizontal plane are not overlapped.

6. The boom assembly of claim 5, wherein,

the first driving device is respectively rotatably connected with the third arm support and the fourth arm support and is used for driving the fourth arm support to rotate relative to the third arm support.

7. The boom assembly of claim 2,

the first driving device is a hydraulic oil cylinder and comprises a cylinder body and a rod piece, the rod piece is rotatably connected with the biasing mechanism, and the cylinder body is rotatably connected with the second arm support (106);

the boom assembly further comprises:

and the connecting rod is respectively and rotatably connected with the biasing mechanism and the second arm support (106).

8. The boom assembly of claim 1, wherein the first boom is a telescopic boom.

9. A work vehicle characterized in that: the work vehicle includes:

a vehicle body;

the boom assembly of any of claims 1-8;

the swivel base is arranged on the vehicle body and is rotatably connected with the arm frame assembly;

the second driving device is arranged close to the connection part of the arm frame assembly and the rotary seat, the second driving device is respectively connected with the arm frame assembly and the rotary seat, and the arm frame assembly can rotate relative to the rotary seat under the driving of the second driving device.

10. The work vehicle of claim 9, characterized in that the vehicle further comprises:

the waterway system is arranged on the vehicle body;

the boom pipeline system is arranged on the boom component and arranged along the length direction of the boom component;

the fire monitor is arranged at the tail end of the arm frame assembly and is connected with the waterway system through the arm frame pipeline system;

the supporting seat is arranged on the vehicle body and used for supporting the jib assembly in a folded state.