CN219508561U - Cantilever crane system and engineering machinery - Google Patents

Abstract

The utility model relates to a boom system and engineering machinery, comprising a rotary table, a telescopic cross arm and a swinging longitudinal arm, wherein the telescopic cross arm is arranged on the rotary table and can execute transverse telescopic action, the telescopic cross arm is provided with a telescopic section, and the swinging longitudinal arm rotates between a folding position capable of being folded relative to the telescopic cross arm or a working position capable of being unfolded relative to the telescopic cross arm; the height of the arm support system is reduced after the third arm body is folded, so that the gravity center height of the arm support system can be reduced, and the transportation stability of the arm support system is improved; the extension direction of the telescopic cross arm can be consistent with the transportation direction of the arm support system, and further the problem of width limitation is solved.

Description

Cantilever crane system and engineering machinery

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to an arm support system and engineering machinery.

Background

At present, in a pile driver arm rest or a drilling machine arm rest, because the structure is complex, the arm body is easy to interfere when being folded under the limit of the structure, so that the arm rest cannot be fully folded; the carrier arm support is mostly a vehicle, the width and the height of the vehicle are not large, but the actual width and the height of the vehicle are increased because the arm support cannot be fully folded, and the passing and the stability of the vehicle are affected;

meanwhile, the whole arm support is generally only flexible/movable in one direction, the degree of freedom is low, each time the construction of one position is completed, the vehicle is required to be moved to carry out the next construction, the process is complicated, the construction efficiency is influenced, the vehicle moving process possibly deviates from a straight line, the drilling position and the inclination angle are required to be readjusted according to the ground condition, and the accuracy and the efficiency are reduced.

Disclosure of Invention

First, the technical problem to be solved

In view of the above-mentioned shortcomings and disadvantages of the prior art, the present utility model provides a boom system and an engineering machine, which solve the technical problems in the prior art that a boom cannot be fully folded and the degree of freedom of the boom is low.

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:

in a first aspect, the present utility model provides an arm support system, including a turntable, a telescopic boom, and a swing trailing arm, where the telescopic boom is provided on the turntable and is capable of performing a lateral telescopic action, the telescopic boom has a telescopic section, and the swing trailing arm is hinged to the telescopic section along a front-rear axis, and the swing trailing arm rotates between a folded position capable of being folded relative to the telescopic boom or an operating position capable of being unfolded relative to the telescopic boom.

In this technical scheme, cantilever crane system includes revolving platform, flexible xarm and swing trailing arm, flexible xarm is connected on the revolving platform, and flexible section of flexible xarm is located to the swing xarm, and when the revolving platform rotated, can drive flexible xarm and swing trailing arm and rotate around the axis of rotation of revolving platform, and when flexible xarm stretches out and draws back for the revolving platform, can drive the extension or the shortening that swing xarm carries out synchronization for this cantilever crane possesses including rotation, flexible and a plurality of degrees of freedom including the swing, and then makes this cantilever crane system obtain higher flexibility of use, makes this cantilever crane can match the user demand of different construction positions.

For example, when the arm support system is applied to a pile hammer as a mechanical arm of the pile hammer, the pile hammer can be driven at a corresponding position on the premise of not moving, so that the construction position and the inclination angle do not need to be readjusted, and the pile driving accuracy and the pile driving efficiency are improved;

the cantilever crane system can be applied to a drilling machine, and when the cantilever crane system is used as a mechanical arm of the drilling machine, drilling at a corresponding position can be realized on the premise that the drilling machine does not move, so that readjustment of the drilling position and the inclination angle is not needed, and the accuracy of drilling and the drilling efficiency are improved.

Moreover, because the swing trailing arm can be switched between the folding position or the working position, when the boom system is used, the swing trailing arm can swing to the working position, and when the boom is transported, the swing trailing arm can be in the folding position, so that the boom can meet the use requirement, and meanwhile, the longitudinal space during transportation can be saved, the compactness of the structure is improved, the problem of height limitation is further solved, the height of the boom system after the third boom body is folded is reduced, the gravity center height of the boom system can be further reduced, the transportation stability of the boom system is further improved, and meanwhile, the gravity center of the boom can be kept on the central line of an assembly matrix of the boom system, and the stability of the boom is further improved.

Meanwhile, in the transportation process of the boom system, on the basis that the swing longitudinal arm can be folded, the rotary table can be rotated, the extending direction of the telescopic cross arm is consistent with the transportation direction of the boom system, so that the transverse space during transportation can be saved, and the problem of width limitation is further solved.

In one technical scheme of the utility model, the telescopic cross arm comprises a first arm body, a second arm body and a first telescopic driving piece, wherein the first arm body is arranged on the rotary table, the telescopic section is arranged as the second arm body, the first arm body and the second arm body are connected in a sliding manner along the axial direction, and two ends of the first telescopic driving piece are correspondingly connected with the first arm body and the second arm body.

In the technical scheme, the telescopic cross arm comprises a first arm body, a second arm body and a first telescopic driving piece, two ends of the first telescopic piece can be respectively connected to the first arm body and the second arm body, and the first telescopic piece stretches to drive the second cross arm to stretch relative to the first cross arm.

Specifically, the second telescopic member can be provided as a hydraulic cylinder, and a form supported by the support block can be provided between the first arm body and the second arm body.

In one technical scheme of the utility model, the swing trailing arm comprises a third arm body and a second telescopic driving piece, and two ends of the second telescopic driving piece are respectively hinged to the telescopic section and the third arm body along the front-back direction.

In this technical scheme, swing trailing arm includes the third arm body and the flexible driving piece of second, and the flexible driving piece of second can drive the third arm and rotate relative flexible xarm, not only can realize the switching of swing trailing arm position, enters folding position from working position promptly, can also adjust its angle when swing trailing arm is in working position, makes it better match work demand.

In particular, the second telescopic drive can also be provided as a hydraulic cylinder.

In one technical scheme of the utility model, the arm support system further comprises a horizontal adjusting mechanism, the first arm body is transversely hinged to the rotary table, the horizontal adjusting mechanism comprises a third telescopic driving piece, and two ends of the third telescopic driving piece are respectively hinged to the first arm body and the rotary table.

In the technical scheme, the horizontal adjusting mechanism is used for adjusting the transverse swinging angle of the telescopic cross arm, namely, the leveling in the horizontal direction of the telescopic cross arm is realized, and the accuracy of the boom system in use is further improved.

Specifically, the horizontal adjustment mechanism includes the flexible driving piece of third, and the flexible driving piece of third can set up to two sets of, and its both sides of locating flexible xarm, and flexible xarm's first arm body can be articulated in the revolving platform through articulated seat, cooperates the regulation and control effect of two sets of flexible driving pieces of third, can more accurate more stable realization cantilever crane system's leveling.

The third telescopic drive can likewise be provided as a hydraulic cylinder.

In one technical scheme of the utility model, the arm support system further comprises a support base and a support top seat, wherein the support base is arranged on the first arm body, the support top seat is arranged on the third arm body, the swing longitudinal arm is positioned at the folding position, and the support base and the support top seat are abutted to realize the support of the first arm body on the third arm body.

In the technical scheme, when the swing trailing arm is positioned at the folding position, the supporting base can support the supporting top seat, so that the first arm body supports the third arm body, and the first arm body and the third arm body can be prevented from being in direct contact, so that the first arm body or the second arm body can be prevented from being damaged due to mutual collision of the first arm body and the third arm body.

In one embodiment of the present utility model, a protective layer is provided on the contact surface of the support base and/or the support top.

In the technical scheme, the protective layer is additionally arranged on the contact surface of the two, the protective layer can buffer the impact of the two when the two are contacted, the two can be prevented from being directly rigidly contacted to generate larger noise and vibration, and the protective layer can be arranged as a rubber layer.

In a second aspect, the present utility model provides an engineering machine, including the boom system in any one of the above-mentioned technical solutions, further including a carrying device and an executing assembly, where the turntable is disposed on the carrying device, and the executing assembly is disposed on the third arm body; the execution assembly is connected to the third arm body through a sliding rail groove.

In the technical scheme, the engineering machinery comprising the boom system in the technical scheme is limited, and the engineering machinery comprises a carrying device which is used for driving the boom system to integrally move; an execution component is also included for executing the pair of engineering work flows.

In particular, the running gear can be provided with a carrier vehicle and the actuating assembly can then be provided as a pile driving assembly or a drilling assembly, i.e. such that the working machine forms a kind of motorized pile driver or automatic drilling machine.

In one technical scheme of the utility model, the execution assembly comprises an execution piece, and the execution piece is vertically and slidingly connected with the sliding rail groove.

In the technical scheme, corresponding executing pieces such as a piling arm or a drilling arm can be connected in the sliding rail groove in a sliding mode, meanwhile, the piling arm or the drilling arm can slide along the sliding direction limited by the sliding rail groove, and further stroke compensation of the executing pieces is achieved, so that depth requirements of operations such as piling or punching can be guaranteed, the height of the arm support during transportation can be reduced, and transportation convenience of the arm support is improved.

In one technical scheme of the utility model, the execution assembly further comprises a fourth telescopic driving piece, two ends of the fourth telescopic driving piece are respectively hinged with the execution piece and the sliding rail groove, and the fourth telescopic driving piece can stretch and retract to drive the execution piece to slide along the sliding direction defined by the sliding rail groove.

In this technical scheme, the fourth flexible driving piece is used for driving the executive component and slides for the slide rail groove, and similarly, the fourth flexible driving piece can set up to the pneumatic cylinder.

In one aspect of the present utility model, the executing components are disposed in multiple groups on the third arm body, and functions of different executing components are the same or different.

In this technical scheme, the execution subassembly can set up to the multiunit on the third arm body, like two sets of, and two sets of execution subassemblies can set up to the function of executing hammer stake or drilling respectively for this engineering machine forms a combined type machinery, and two kinds of construction operations can be carried out to a machinery, and improvement construction convenience that can be very big also has lower cost simultaneously with two independent equipment.

The two groups of execution components can be set to execute the same functions, and after the construction position and the interval between the execution components are reasonably adjusted, the construction of two construction points can be realized by single construction action, so that the construction efficiency is further improved.

(III) beneficial effects

The beneficial effects of the utility model are as follows: according to the arm support system and engineering machinery, the telescopic cross arm is connected to the rotary table, the swinging cross arm is arranged on the telescopic section of the telescopic cross arm, when the rotary table rotates, the telescopic cross arm and the swinging longitudinal arm can be driven to rotate around the rotation axis of the rotary table, and when the telescopic cross arm stretches relative to the rotary table, the swinging cross arm can be driven to synchronously stretch or shorten, so that the arm support has multiple degrees of freedom including rotation, stretching and swinging, further, the arm support system can obtain higher use flexibility, and the arm support can be matched with use requirements of different construction positions.

Moreover, because the swing trailing arm can be switched between the folding position or the working position, when the boom system is used, the swing trailing arm can swing to the working position, and when the boom is transported, the swing trailing arm can be in the folding position, so that the boom can meet the use requirement, and meanwhile, the longitudinal space during transportation can be saved, the compactness of the structure is improved, the problem of height limitation is further solved, the height of the boom system after the third boom body is folded is reduced, the gravity center height of the boom system can be further reduced, the transportation stability of the boom system is further improved, and the gravity center of the boom can be further kept on the central line of an assembly matrix of the boom system, so that the stability of the boom is further improved.

Meanwhile, in the transportation process of the boom system, on the basis that the swing longitudinal arm can be folded, the rotary table can be rotated, the extending direction of the telescopic cross arm is consistent with the transportation direction of the boom system, so that the transverse space during transportation can be saved, and the problem of width limitation is further solved.

Drawings

FIG. 1 is a schematic diagram of a boom system according to the present utility model;

FIG. 2 is a second schematic diagram of the boom system of the present utility model;

FIG. 3 is a third schematic diagram of the boom system according to the present utility model.

[ reference numerals description ]

1: a rotary table;

2: a telescopic cross arm;

21: a first arm body;

22: a second arm body;

23: a first telescopic driving member;

3: swinging the trailing arm;

31: a third arm body;

32: a second telescopic driving member;

4: a horizontal adjustment mechanism;

41: a third telescopic driving member;

5: a support base;

6: a supporting top base;

7: a carrying device;

8: an execution component;

81: an actuator;

82: a fourth telescopic driving member;

a: a slide rail groove.

Detailed Description

The present utility model will be described in detail below with reference to fig. 1 to 3 for better explanation of the present utility model, and for convenience of understanding. Wherein references herein to "upper", "lower", "etc. are made with reference to the orientation of fig. 1.

Example 1:

referring to fig. 1 and 2, an embodiment of the present utility model provides a boom system including a turntable 1, a telescopic boom 2, and a swing boom 3, the telescopic boom 2 being provided to the turntable 1 and capable of performing a lateral telescopic action, the telescopic boom 2 having a telescopic section, the swing boom 3 being hinged to the telescopic section along a longitudinal axis, the swing boom 3 being rotatable between a folded position capable of being folded with respect to the telescopic boom 2 or an operative position capable of being unfolded with respect to the telescopic boom 2.

In this embodiment, the cantilever crane system includes revolving platform 1, flexible xarm 2 and swing trailing arm 3, flexible xarm 2 connects on revolving platform 1, flexible section of flexible xarm 2 is located to the swing xarm, when revolving platform 1 rotates, can drive flexible xarm 2 and swing trailing arm 3 and rotate around the axis of rotation of revolving platform 1, when flexible xarm 2 stretches out and draws back for revolving platform 1, can drive the extension or the shortening that swing xarm carries out synchronization for this cantilever crane possesses a plurality of degrees of freedom including rotation, flexible and swing, and then make this cantilever crane system obtain higher flexibility of use, make this cantilever crane can match the user demand of different construction positions.

For example, when the arm support system is applied to a pile hammer as a mechanical arm of the pile hammer, the pile hammer can be driven at a corresponding position on the premise of not moving, so that the construction position and the inclination angle do not need to be readjusted, and the pile driving accuracy and the pile driving efficiency are improved;

the cantilever crane system can be applied to a drilling machine, and when the cantilever crane system is used as a mechanical arm of the drilling machine, drilling at a corresponding position can be realized on the premise that the drilling machine does not move, so that readjustment of the drilling position and the inclination angle is not needed, and the accuracy of drilling and the drilling efficiency are improved.

Moreover, since the swinging trailing arm 3 can be switched between the folding position or the working position, when the boom system is used, the swinging trailing arm 3 can swing to the working position, and when the boom is transported, the swinging trailing arm can be in the folding position, so that the boom can meet the use requirement, and meanwhile, the longitudinal space during transportation can be saved, the compactness of the structure is improved, the problem of height limitation is further solved, the height of the boom system after the third boom body 31 is folded is reduced, the gravity center height of the boom system is further reduced, the transportation stability of the boom system is further improved, and meanwhile, the gravity center of the boom can be kept on the central line of the assembly matrix, and the stability of the boom is further improved.

Meanwhile, in the transportation process of the boom system, on the basis that the swing trailing arm 3 can be folded, the rotary table 1 can be rotated, the extension direction of the telescopic cross arm 2 is consistent with the transportation direction of the boom system, so that the transverse space during transportation can be saved, and the width limiting problem is further solved.

The telescopic cross arm 2 comprises a first arm body 21, a second arm body 22 and a first telescopic driving piece 23, the first arm body 21 is arranged on the rotary table 1, the telescopic section is arranged as the second arm body 22, the first arm body 21 and the second arm body 22 are in sliding connection along the axial direction, and two ends of the first telescopic driving piece 23 are correspondingly connected with the first arm body 21 and the second arm body 22.

In this embodiment, the telescopic cross arm 2 includes a first arm body 21, a second arm body 22 and a first telescopic driving member 23, two ends of the first telescopic member can be respectively connected to the first arm body 21 and the second arm body 22, and the first telescopic member stretches to drive the second cross arm to stretch relative to the first cross arm.

Specifically, the second telescopic member can be provided as a hydraulic cylinder, and a form supported by a support block can be provided between the first arm 21 and the second arm 22.

In the present embodiment, the swing trailing arm 3 includes a third arm body 31 and a second telescopic driving member 32, and both ends of the second telescopic driving member 32 are hinged to the telescopic section and the third arm body 31 in the front-rear direction, respectively.

In this embodiment, the swing trailing arm 3 includes a third arm body 31 and a second telescopic driving member 32, and the second telescopic driving member 32 can drive the third arm body 31 to rotate relative to the telescopic cross arm 2, so that not only can the position of the swing trailing arm 3 be switched, i.e. the swing trailing arm 3 enters the folding position from the working position, but also the angle of the swing trailing arm 3 can be adjusted when the swing trailing arm is in the working position, so that the swing trailing arm can better match the working requirement.

Specifically, the second telescopic driving means 32 can also be provided as a hydraulic cylinder.

In this embodiment, the boom system further includes a horizontal adjustment mechanism 4, where the first arm body 21 is transversely hinged to the turntable 1, and the horizontal adjustment mechanism 4 includes a third telescopic driving member 41, where two ends of the third telescopic driving member 41 are respectively hinged to the first arm body 21 and the turntable 1.

In this embodiment, the horizontal adjusting mechanism 4 is used to adjust the lateral swing angle of the telescopic boom 2, that is, to level in the horizontal direction of the telescopic boom 2, so as to improve the accuracy of the boom system in use.

Specifically, the horizontal adjustment mechanism 4 includes the flexible driving piece 41 of third, and the flexible driving piece 41 of third can set up to two sets of, and it locates the both sides of flexible xarm 2, and the first arm body 21 of flexible xarm 2 can articulate in revolving platform 1 through articulated seat, cooperates the regulation and control effect of two sets of flexible driving pieces 41 of third, can more accurate more stable realization cantilever crane system's leveling.

The third telescopic drive 41 can likewise be provided as a hydraulic cylinder.

Example 2:

referring to fig. 1, the embodiment of the present utility model further includes the following technical means in addition to all the technical means of the above embodiment:

the arm support system further comprises a support base 5 and a support top seat 6, the support base 5 is arranged on the first arm body 21, the support top seat 6 is arranged on the third arm body 31, the swing longitudinal arm 3 is in a folding position, and the support base 5 and the support top seat 6 are abutted to realize the support of the first arm body 21 on the third arm body 31.

In this embodiment, when the swing trailing arm 3 is in the folded position, the supporting base 5 can support the supporting top seat 6, so as to further support the first arm body 21 to the third arm body 31, which can avoid the first arm body 21 and the third arm body 31 from directly contacting, and thus can avoid the first arm body 21 or the second arm body 22 from being damaged due to collision.

Example 3:

the embodiment of the present utility model further includes the following technical means in addition to all the technical means of embodiment 3:

the support base 5 and/or the support top base 6 are provided with a protective layer on their surfaces in contact.

In this embodiment, a protective layer is additionally disposed on the contact surface of the two, and the protective layer can buffer the impact when the two are in contact, so that the two can be prevented from directly generating rigid contact to generate larger noise and vibration, and the protective layer can be provided as a rubber layer.

Example 4:

referring to fig. 2 and 3, an embodiment of the present utility model provides an engineering machine, including the boom system in any of the foregoing embodiments, further including a carrying device 7 and an executing assembly 8, where the turntable 1 is disposed on the carrying device 7, and the executing assembly 8 is disposed on a third arm 31; wherein, the actuating component 8 is connected to the third arm 31 through the sliding rail groove a.

In this embodiment, a construction machine comprising the boom system in the above technical solution is defined, and the construction machine comprises a carrying device 7 for driving the boom system to move integrally; an execution component 8 is also included for executing the engineering work flow for use.

In particular, the running gear can be provided with a carrier vehicle and the actuating assembly 8 can be provided as a pile driving assembly or a drilling assembly, i.e. such that the working machine forms a kind of motorized pile driver or automatic drilling machine.

Example 5:

referring to fig. 2, the embodiment of the present utility model further includes the following technical means in addition to all the technical means of embodiment 4:

the execution assembly 8 comprises an execution piece 81, and the execution piece 81 is vertically and slidingly connected with the sliding rail groove A.

In this embodiment, the corresponding executing member 81, such as a piling arm or a drilling arm, can be slidably connected in the sliding rail groove a, and meanwhile, the piling arm or the drilling arm can slide along the sliding direction defined by the sliding rail groove a, so that stroke compensation of the executing member 81 is achieved, not only can depth requirements of operations such as piling or punching be ensured, but also the height of the arm support during transportation can be reduced, and transportation convenience of the arm support is improved.

In this embodiment, the executing assembly 8 further includes a fourth telescopic driving member 82, two ends of the fourth telescopic driving member 82 are hinged to the executing member 81 and the sliding rail groove a, and the fourth telescopic driving member 82 can stretch and retract to drive the executing member 81 to slide along the sliding direction defined by the sliding rail groove a.

In this embodiment, the fourth telescopic driving member 82 is used to drive the actuator 81 to slide relative to the slide rail groove a, and likewise, the fourth telescopic driving member 82 can be configured as a hydraulic cylinder.

Example 6:

referring to fig. 2 and 3, the embodiment of the present utility model further includes the following technical means in addition to all the technical means of embodiment 4 or embodiment 5 described above:

the execution units 8 are arranged in a plurality of groups on the third arm 31, and the functions of different execution units 8 are the same or different.

In this embodiment, the execution assemblies 8 may be disposed in multiple groups, such as two groups, on the third arm 31, and the two groups of execution assemblies 8 may be disposed to execute functions of piling or drilling, respectively, so that the construction machine forms a composite machine, and one machine may execute two kinds of construction operations, so that the construction convenience can be greatly improved, and meanwhile, the construction machine has lower cost compared with two separate devices.

The two groups of execution assemblies 8 can be set to execute the same function, and after the construction position and the interval between the execution assemblies 8 are reasonably adjusted, the construction of two construction points can be realized by single construction action, so that the construction efficiency is further improved.

It will be appreciated that the above examples 1-6, except where conflicting moieties, may be freely combined to form further embodiments of the present utility model.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus/means that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus/means.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims (10)

1. An arm support system, characterized in that: comprising the following steps:

the telescopic transverse arm (2) is arranged on the rotary table (1) and can execute transverse telescopic action, the telescopic transverse arm (2) is provided with a telescopic section, the swinging longitudinal arm (3) is hinged with the telescopic section along the axis of the front-back direction, and the swinging longitudinal arm (3) rotates between a folding position capable of being folded relative to the telescopic transverse arm (2) or a working position capable of being unfolded relative to the telescopic transverse arm (2).

2. The boom system of claim 1, wherein: the telescopic cross arm (2) comprises a first arm body (21), a second arm body (22) and a first telescopic driving piece (23), wherein the first arm body (21) is arranged on the rotary table (1), the telescopic section is arranged as the second arm body (22), the first arm body (21) is in sliding connection with the second arm body (22) along the axis direction, and two ends of the first telescopic driving piece (23) are correspondingly connected with the first arm body (21) and the second arm body (22).

3. The boom system of claim 2, wherein: the swing trailing arm (3) comprises a third arm body (31) and a second telescopic driving piece (32), and two ends of the second telescopic driving piece (32) are hinged to the telescopic section and the third arm body (31) along the front-back direction respectively.

4. The boom system of claim 2, wherein: the cantilever crane system further comprises a horizontal adjusting mechanism (4), the first arm body (21) is transversely hinged to the rotary table (1), the horizontal adjusting mechanism (4) comprises a third telescopic driving piece (41), and two ends of the third telescopic driving piece (41) are respectively hinged to the first arm body (21) and the rotary table (1).

5. A boom system according to claim 3, wherein: the cantilever crane system further comprises a support base (5) and a support footstock (6), wherein the support base (5) is arranged on the first arm body (21), the support footstock (6) is arranged on the third arm body (31), the swing longitudinal arm (3) is positioned at the folding position, and the support base (5) and the support footstock (6) are abutted to realize the support of the first arm body (21) on the third arm body (31).

6. The boom system of claim 5, wherein: and a protective layer is arranged on the contact surface of the supporting base (5) and/or the supporting top seat (6).

7. An engineering machine, characterized in that: boom system according to any of claims 3 to 6, further comprising a carrier (7) and an actuator assembly (8), said turret (1) being arranged in said carrier (7), said actuator assembly (8) being arranged in said third arm (31);

wherein the execution assembly (8) is connected to the third arm body (31) through a sliding rail groove (A).

8. The work machine of claim 7, wherein: the execution assembly (8) comprises an execution piece (81), and the execution piece (81) is vertically and slidingly connected with the sliding rail groove (A).

9. The work machine of claim 8, wherein: the execution assembly (8) further comprises a fourth telescopic driving piece (82), two ends of the fourth telescopic driving piece (82) are respectively hinged to the execution piece (81) and the sliding rail groove (A), and the fourth telescopic driving piece (82) can stretch and retract to drive the execution piece (81) to slide along the sliding direction defined by the sliding rail groove (A).

10. A working machine as claimed in any one of claims 7 to 9, characterized in that: the execution assemblies (8) are arranged on the third arm body (31) into a plurality of groups, and the functions of different execution assemblies (8) are the same or different.