阅读说明：本技术 起重机配重结构及汽车起重机 (Crane counterweight structure and automobile crane ) 是由 周斌 张振宇 周泉 于 2020-04-30 设计创作，主要内容包括：本实施例提供了一种起重机配重结构及汽车起重机,涉及起重机领域。旨在改善现有的起重机配重使用受限的问题。起重机配重结构包括机架和配重块；配重块,配重块绕竖直方向可转动地设置在机架上,在配重块转动的过程中,配重块的重心到机架的回转中心的距离增大或减小。汽车起重机包括起重机配重结构。配重块绕竖直方向可转动地设置在机架上,配重块的重力垂直向下,在竖直方向的分力为零,因此配重块在转动的过程中仅需要克服部件之间接触产生的摩擦力,不需要克服重力,从而驱动配重块转动的驱动机构可以省去或者降低标准,有助于简化配重结构,从而扩大配重结构的使用场景。(This embodiment provides a hoist counter weight structure and mobile crane, relates to the hoist field. Aims to solve the problem that the use of the existing crane counterweight is limited. The crane counterweight structure comprises a frame and a counterweight block; the balancing weight is rotationally arranged on the rack around the vertical direction, and the distance from the gravity center of the balancing weight to the rotation center of the rack is increased or decreased in the rotating process of the balancing weight. The truck crane comprises a crane counterweight structure. The balancing weight is rotationally arranged on the frame around the vertical direction, the gravity of the balancing weight is vertical downward, and the component force in the vertical direction is zero, so that the balancing weight only needs to overcome the friction force generated by the contact between the parts in the rotating process, and the gravity does not need to be overcome, so that the driving mechanism for driving the balancing weight to rotate can save or reduce the standard, the balancing weight structure is facilitated to be simplified, and the use scene of the balancing weight structure is enlarged.)

1. A crane counterweight structure, comprising:

a frame (100) and a counterweight;

the counterweight block is rotatably arranged on the rack (100) around the vertical direction, and in the rotating process of the counterweight block, the distance from the gravity center of the counterweight block to the rotation center of the rack (100) is increased or reduced.

2. A crane counterweight structure as claimed in claim 1, wherein:

during the rotation of the balancing weight, the balancing weight is switched between a first state and a second state;

when the counterweight block is in the first state, the gravity center of the counterweight block falls at a first preset position, and when the counterweight block is in the second state, the gravity center of the counterweight block falls at a second preset position, and the second preset position is far away from the rotation center of the rack (100) relative to the first preset position.

3. A crane counterweight structure as claimed in claim 2, wherein:

the balancing weight is arranged at the tail part of the frame (100).

4. A crane counterweight structure as claimed in claim 3, wherein:

the crane counterweight structure further comprises a connecting pin shaft (300), the connecting pin shaft (300) is arranged on the rack (100) in the vertical direction, and the counterweight block is rotatably arranged on the rack (100) through the connecting pin shaft (300).

5. A crane counterweight structure as claimed in claim 4, wherein:

the crane counterweight structure further comprises a positioning pin shaft (400); the frame (100) is provided with a first jack (110) and a second jack (111), and the balancing weight is provided with a first connecting hole (220) and a second connecting hole (221);

under the first state, first connecting hole (220) with first jack (110) correspond, locating pin (400) are used for passing first connecting hole (220) with first jack (110), so that the balancing weight is in first preset position is relative frame (100) is fixed under the second state, second connecting hole (221) with second jack (111) correspond, locating pin (400) are used for passing second connecting hole (221) with second jack (111), so that the balancing weight is relative in second preset position frame (100) is fixed.

6. A crane counterweight structure as claimed in claim 5, wherein:

the rack (100) is provided with a third jack (112), the counterweight block is provided with a third connecting hole (222), the third jack (112) corresponds to the third connecting hole (222), and the connecting pin shaft (300) penetrates through the third connecting hole (222) and the third jack (112) so that the counterweight block rotates around the connecting pin shaft (300) relative to the rack (100);

the connecting lines of the centers of the first connecting hole (220), the second connecting hole (221) and the third connecting hole (222) are triangular and are arranged at one end of the balancing weight together.

7. A crane counterweight structure as claimed in claim 6, wherein:

the centerlines of the first jack (110), the second jack (111), and the third jack (112) lie in the same vertical plane.

8. A crane counterweight structure as claimed in any one of claims 2 to 7, wherein:

the balancing weight comprises a first balancing weight (230) and a second balancing weight (234), and the first balancing weight (230) and the second balancing weight (234) are symmetrically arranged relative to the rotation center of the rack (100).

9. A crane counterweight structure as claimed in claim 8, wherein:

the rack (100) is provided with a frame, and the frame is provided with a first assembly frame (120) and a second assembly frame (130) which are opposite;

the first balancing weight (230) is arranged on the first assembling frame (120), and one end of the first balancing weight (230) is turned into or out of the first assembling frame (120) in the process of switching the first balancing weight (230) between the first state and the second state;

the second balancing weight (234) is arranged on the second assembly frame (130), and in the process that the second balancing weight (234) is switched between the first state and the second state, one end of the second balancing weight (234) is turned into or turned out of the frame, and the second assembly frame (130) is arranged on the frame.

10. An automobile crane is characterized in that:

the mobile crane comprises a crane counterweight structure according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of cranes, in particular to a crane counterweight structure and an automobile crane.

Background

The stability of the whole machine is one of the key indexes influencing the hoisting performance of the hoisting machinery, so that the weight of the counterweight is increased to the limit that an axle can bear when the hoisting machinery is designed, and the stability of the whole machine is improved to the maximum extent.

The existing method for realizing the stability improvement of the whole machine through the counterweight action has two types:

movable counterweight: the weight of the balance weight of the hoisting machinery is certain, and the stability of the hoisting weight of the whole machine is improved in a mode that the balance weight moves outwards for a certain distance relative to the rotation center through external force. There are two kinds of technical means on the implementation, be guide rail type and connecting rod formula respectively, and these two kinds of modes lead to counter weight overall structure more complicated, and occupation space is great, and the use scene is restricted.

And (3) combined counterweight: after the vehicle is positioned in a hoisting area, the counterweight is hung on the hoisting machinery through a hydraulic oil cylinder or other modes, and the hoisting stability of the whole machine is improved through a mode of increasing the weight of the counterweight. The added counter weight is carried by a vehicle and is limited by the bridge load of the hoisting machinery and safety consideration, and meanwhile, the stacking of the counter weight also occupies space; the use of additional vehicle transport is limited by use costs.

In view of the above, the existing crane counterweight structure has many limitations in the using process.

Disclosure of Invention

Objects of the invention include, for example, providing a crane counterweight structure that can ameliorate the problem of limited use of existing crane counterweights.

The object of the present invention is also to provide a truck crane which can improve the problem of limited use of existing crane counterweights.

Embodiments of the invention may be implemented as follows:

the embodiment of the invention provides a crane counterweight structure, which comprises:

a frame and a counterweight;

the balancing weight is rotationally arranged on the rack around the vertical direction, and the distance from the gravity center of the balancing weight to the rotation center of the rack is increased or decreased in the rotating process of the balancing weight.

In addition, the crane counterweight structure provided by the embodiment of the invention can also have the following additional technical characteristics:

optionally:

during the rotation process of the balancing weight, the balancing weight is switched between a first state and a second state;

when the balancing weight is in the first state, the gravity center of the balancing weight falls at a first preset position, and when the balancing weight is in the second state, the gravity center of the balancing weight falls at a second preset position, and the second preset position is far away from the rotation center of the rack relative to the first preset position.

Optionally:

the balancing weight is arranged at the tail part of the frame.

Optionally:

the crane counterweight structure further comprises a connecting pin shaft, the connecting pin shaft is arranged on the rack in the vertical direction, and the counterweight block is rotatably arranged on the rack through the connecting pin shaft.

Optionally:

the crane counterweight structure also comprises a positioning pin shaft; the frame is provided with a first jack and a second jack, and the balancing weight is provided with a first connecting hole and a second connecting hole;

under the first state, first connecting hole and first jack correspond, and the locating pin axle is used for passing first connecting hole and first jack to make the balancing weight fixed relative to the frame in first preset position, and under the second state, second connecting hole and second jack correspond, and the locating pin axle is used for passing second connecting hole and second jack, so that the balancing weight is fixed relative to the frame in second preset position.

Optionally:

the frame is provided with a third jack, the balancing weight is provided with a third connecting hole, the third jack corresponds to the third connecting hole, and the connecting pin shaft passes through the third connecting hole and the third jack so that the balancing weight rotates around the connecting pin shaft relative to the frame;

the connecting lines of the centers of the first connecting hole, the second connecting hole and the third connecting hole are triangular and are arranged at one end of the balancing weight together.

Optionally:

the center lines of the first jack, the second jack and the third jack are located in the same vertical plane.

Optionally:

the balancing weight comprises a first balancing weight and a second balancing weight, and the first balancing weight and the second balancing weight are symmetrically arranged relative to the rotation center of the frame.

Optionally:

the frame is provided with a first assembling frame and a second assembling frame which are opposite;

the first balancing weight is arranged on the first assembly frame, and one end of the first balancing weight is turned into or out of the first assembly frame in the process of switching the first balancing weight between the first state and the second state;

the second balancing weight is arranged on the second assembling frame, and in the process of switching between the first state and the second state, one end of the second balancing weight is turned into or turned out of the second assembling frame of the frame.

The embodiment of the invention also provides the automobile crane. The truck crane comprises a crane counterweight structure.

The crane counterweight structure and the automobile crane provided by the embodiment of the invention have the beneficial effects of, for example:

the crane counterweight structure, the balancing weight rotationally sets up in the frame around vertical direction, the gravity of balancing weight is perpendicular downwards, component force at vertical direction is zero, consequently, the balancing weight only need overcome the frictional force that the contact produced between the part at the pivoted in-process, need not overcome gravity to drive balancing weight pivoted actuating mechanism can save or reduce the standard, help simplifying the counterweight structure, thereby enlarge the use scene of counterweight structure.

Meanwhile, the balancing weight rotates around the vertical direction, and the height of the whole machine is unchanged in the rotating process of the balancing weight, so that the height of the crane is not limited by the road.

Moreover, the balancing weight blocks are rotated, so that the gravity centers of the balancing weight blocks are far away from or close to the rotation center, the gravity centers of the balancing weight blocks are far away from the rotation center, the gravity centers of the whole machine can be moved backwards, the moment generated by the balancing weight blocks relative to the rotation center is increased, the stability of the whole machine is improved, the combined type balancing weight is not limited by the weight of the whole machine and the bridge load in the mode, the vehicle is not additionally added, and the use cost is reduced.

The automobile crane comprises the crane counterweight structure, and the problem that the use of the existing crane counterweight is limited can be solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a first view angle of a first state of a counterweight structure of a crane according to an embodiment of the present invention;

FIG. 2 is a structural diagram of a crane counterweight structure according to an embodiment of the present invention from a second perspective in a first state;

FIG. 3 is a schematic structural diagram of a third perspective view of a first state of a counterweight structure of a crane according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a first perspective view of a second state of a counterweight structure of a crane according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a second perspective view of a second state of a counterweight structure of a crane according to an embodiment of the present invention;

fig. 6 is a structural schematic diagram of a third perspective of a second state of a counterweight structure of a crane according to an embodiment of the present invention.

Icon: 10-crane counterweight structure; 100-a frame; 110-a first receptacle; 111-a second receptacle; 112-a third receptacle; 120-a first assembly frame; 121-left side plate; 122-a top plate; 123-right side plate; 124-a bottom plate; 130-a second assembly frame; 210-a first edge; 211-a second edge; 212-a third edge; 213-fourth edge; 220-a first connection hole; 221-a second connection hole; 222-third connection hole; 230-a first weight; 234-a second weight; 300-connecting a pin shaft; 400-positioning the pin shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

At present, the combined counterweight needs to be loaded on a vehicle, is limited by the weight of the whole vehicle and the bridge load, or additionally increases the counterweight for conveying the vehicle, has higher use cost and is not flexible enough. Adopt portable counter weight, the mode through guide rail formula and connecting rod formula stimulates the balancing weight to move on the frame, realizes the removal of balancing weight focus, but the space that this kind of mode occupy is big, and the use scenario is limited. The crane counterweight structure and the automobile crane provided by the embodiment can improve the technical problem.

The crane counterweight structure 10 provided in the present embodiment is described in detail below with reference to fig. 1 to 4.

Referring to fig. 1, an embodiment of the present invention provides a counterweight structure 10 of a crane, including: a frame 100 and a weight; the balancing weight is rotatably arranged on the rack 100 around the vertical direction, and in the rotating process of the balancing weight, the distance from the gravity center of the balancing weight to the rotation center of the rack 100 is increased or decreased.

The moment generated by the counterweight block relative to the rotation center influences the stability of the crane, the weight of the counterweight block is Q, the distance between the gravity center of the counterweight block and the rotation center is L, and then the moment acting on the rotation center by the counterweight block is W (Q ×L).

The balancing weight rotationally sets up in frame 100, balancing weight pivoted in-process, the balancing weight can be kept away from or is close to the centre of rotation, at hoist walking in-process, the balancing weight can rotate to the balancing weight focus and be close to the position of centre of rotation, need the during operation at the hoist, the balancing weight rotates to the balancing weight focus and keeps away from the position of centre of rotation to the moment of rotation of the focus of increase balancing weight, and then improves the holistic stability of hoist.

The counterweight rotates about a vertical direction, which is the vertical direction of the crane frame 100 relative to the horizontal position when the crane frame is in the horizontal position. Taking the relative position in fig. 1 as an example, the direction indicated by the arrow a is indicated. In the rotating process of the balancing weight, the gravity of the balancing weight is downward, the gravity of the balancing weight cannot act on the rotating direction, the balancing weight is rotated only by overcoming the friction force generated by contact between the parts, and therefore the balancing weight can be pushed to rotate through manpower or an oil cylinder, the balancing weight structure is facilitated to be simplified, and the use scene of the balancing weight structure is enlarged.

Referring to fig. 1, in the present embodiment, the counterweight is disposed at the tail of the frame 100, so that the redundant space at the tail of the frame 100 can be fully utilized, and the mechanism is hidden without affecting the appearance. Taking the relative position in fig. 1 as an example, the counterweight is disposed at the right end of the frame 100.

Referring to fig. 1, with reference to fig. 3, in the process of rotating the weight block, the weight block is switched between the first state and the second state; in the first state, the center of gravity of the weight member falls at a first predetermined position, and in the second state, the center of gravity of the weight member falls at a second predetermined position, which is away from the center of rotation of the frame 100 relative to the first predetermined position.

Referring to fig. 1, in the first state, the center of gravity of the weight member is located at a first predetermined position. Referring to fig. 3, in the second state, the center of gravity of the weight member is located at the second predetermined position. With the relative positions shown in fig. 1 and fig. 3, the counterweight is disposed at the tail of the frame 100, when the crane is in a traveling state, the counterweight is in a first state, when the crane is in a working state, the counterweight is switched from the first state to a second state, and the center of gravity of the counterweight moves backward.

Referring to fig. 1, fig. 2 and fig. 3, in the present embodiment, the counterweight structure 10 of the crane further includes a connecting pin 300, the connecting pin 300 is disposed on the frame 100 along a vertical direction, and the counterweight is rotatably disposed on the frame 100 through the connecting pin 300.

Wherein, the balancing weight rotationally sets up the concrete mode on frame 100 through connecting pin axle 300: the connecting pin shaft 300 is fixed on the frame 100 along the vertical direction, and the balancing weight is rotationally connected with the connecting pin shaft 300; or the connecting pin 300 is rotatably arranged on the rack 100 along the vertical direction, and the balancing weight is fixed with the connecting pin 300; or the connecting pin shaft 300 is rotatably arranged on the rack 100 along the vertical direction, and the balancing weight is rotatably connected with the connecting pin shaft 300; or the two ends of the connecting pin 300 are respectively connected with the frame 100 in a rotating way, and the balancing weight is connected with the connecting pin 300.

Referring to fig. 4, the crane counterweight structure 10 further includes a positioning pin 400; the housing 100 is provided with a first insertion hole 110 and a second insertion hole 111, and the weight block is provided with a first connection hole 220 and a second connection hole 221.

Referring to fig. 1, fig. 2 and fig. 3 again, in the first state, the first connection hole 220 corresponds to the first insertion hole 110, and the positioning pin 400 is used to pass through the first connection hole 220 and the first insertion hole 110, so that the counterweight block is fixed at a first predetermined position relative to the frame 100.

Referring to fig. 4, fig. 5 and fig. 6 again, in the second state, the second connection hole 221 corresponds to the second insertion hole 111, and the positioning pin 400 is used to pass through the second connection hole 221 and the second insertion hole 111, so that the weight block is fixed relative to the frame 100 at the second predetermined position.

In the first state, the weight member is pushed to rotate, so that the first connection hole 220 corresponds to the first insertion hole 110, and the positioning pin 400 is inserted into the first connection hole 220 and the first insertion hole 110. In the second state, the positioning pin 400 is taken out, the counterweight block is pushed to rotate, the second connecting hole 221 corresponds to the second insertion hole 111, and the positioning pin 400 is inserted into the second connecting hole 221 and the second insertion hole 111, so that the counterweight block is fixed relative to the frame 100 in the two states.

Referring to fig. 4, in the present embodiment, the rack 100 is provided with a third insertion hole 112, the counterweight block is provided with a third connection hole 222, the third insertion hole 112 corresponds to the third connection hole 222, and the connection pin 300 passes through the third connection hole 222 and the third insertion hole 112, so that the counterweight block rotates around the connection pin 300 relative to the rack 100; the connecting lines of the centers of the first connecting hole 220, the second connecting hole 221 and the third connecting hole 222 are triangular and are commonly disposed at one end of the weight block.

Specifically, described in relative positions in fig. 4, the first connection hole 220, the second connection hole 221, and the third connection hole 222 are provided at the left end of the weight block. The balancing weight is blocky, and the balancing weight is including setting up at the first border 210 of left end, setting at the second border 211 that is close to frame 100 one side, setting at the third border 212 of right-hand member and setting at the fourth border 213 of keeping away from frame 100 one side, and first connecting hole 220 sets up at fourth border 213, and second connecting hole 221 and third connecting hole 222 set up at second border 211, and second connecting hole 221 is located the left side of third connecting hole 222.

With continued reference to fig. 4, in the present embodiment, the center lines of the first jack 110, the second jack 111, and the third jack 112 are located in the same vertical plane. Described in a relative position in fig. 4, the first receptacle 110, the second receptacle 111, and the third receptacle 112 are sequentially arranged from left to right.

Referring to fig. 4, in the present embodiment, the weight block includes a first weight block 230 and a second weight block 234, and the first weight block 230 and the second weight block 234 are symmetrically disposed relative to the rotation center of the frame 100.

Without changing the occupied space, it is possible to increase the weight of the weight block to overlap the first weight block 230 and the second weight block 234 to overlap the second weight block 234, so as to increase the moment by increasing the weight of the weight block. For example, the number of the first weight blocks 230 may be multiple, and the multiple first weight blocks 230 are sequentially stacked. The number of the second weight blocks 234 may be multiple, and the multiple second weight blocks 234 are sequentially stacked.

Referring to fig. 4, the rack 100 is provided with a frame, and the frame is provided with a first assembly frame 120 and a second assembly frame 130 which are opposite to each other; the first balancing weight 230 is arranged on the first assembly frame 120, and in the process of switching the first balancing weight 230 between the first state and the second state, one end of the first balancing weight 230 is turned into or turned out of the first assembly frame 120; the second weight 234 is disposed on the second assembly frame 130, and during the switching process of the second weight 234 between the first state and the second state, one end of the second weight 234 is rotated into or out of the second assembly frame 130.

Specifically, described in a relative position in fig. 4, the first assembly frame 120 and the second assembly frame 130 are sequentially disposed from bottom to top.

Specifically, the first assembly frame 120 includes a left side plate 121, a top plate 122, a right side plate 123 and a bottom plate 124 which are sequentially connected end to end, the number of the first insertion holes 110 is two, and the two first insertion holes 110 are respectively arranged at the edge of the top plate 122 and the edge of the bottom plate 124; the number of the second insertion holes 111 is two, and the two second insertion holes 111 are respectively arranged at the edge of the top plate 122 and the edge of the bottom plate 124; the number of the third insertion holes 112 is two, and the two third insertion holes 112 are respectively disposed at the edge of the top plate 122 and the edge of the bottom plate 124.

In the process of rotating the first weight member 230, when the left end of the first weight member 230 rotates into the first assembly frame 120 and the second edge 211 abuts against the inner side of the right side plate 123, the first weight member 230 is switched to the first state. When the right end of the first weight 230 is rotated out of the first assembly frame 120 and the second edge 211 abuts against the outer edge of the right plate 123, the second weight 234 is switched to the second state. The first assembly frame 120 is used for limiting the rotation process of the first weight block 230, so as to determine the positions of the first state and the second state of the first weight block 230.

Similarly, the second assembly frame 130 is used for limiting the rotation process of the second weight block 234, so as to determine the positions of the first state and the second state of the second weight block 234. The assembling relationship between the second weight member 234 and the second assembling frame 130 is the same as that between the first weight member 230 and the first assembling frame 120, and will not be described in detail.

In the present embodiment, the first assembly frame 120 and the second assembly frame 130 communicate.

Referring to fig. 4, in the present embodiment, the bottom of the weight block is supported on the frame 100, and the frame 100 is used for always bearing the weight block in the process of rotating the weight block. The frame 100 supports the weight block, reducing the difficulty of pushing the weight block to rotate.

Specifically, the bottom of the first weight 230 is supported on the bottom plate 124, and the bottom of the second weight 234 is supported on the bottom of the second assembly frame 130.

The embodiment of the invention also provides the automobile crane. The mobile crane comprises a crane counterweight structure 10. The automobile crane is one kind of crane installed on common or special automobile chassis and has driving cab separated from the crane control cab. The chassis performance of the automobile crane is equal to that of a lorry with the same total weight of the whole automobile, and the automobile crane meets the technical requirements of road vehicles, so that the automobile crane can pass through various roads without resistance. The crane counterweight structure 10 provided by the embodiment can reduce the size of the counterweight structure and the height of the counterweight structure, so that the limitation of a road on the width and the height of a vehicle is avoided.

The crane counterweight structure 10 provided by the embodiment at least has the following advantages:

the balancing weight is rotatably arranged on the rack 100 around the vertical direction, the gravity of the balancing weight is vertical downward, the component force in the vertical direction is zero, the balancing weight only needs to overcome the friction force generated by the contact between the parts in the rotating process, and the gravity does not need to be overcome, so that the driving mechanism for driving the balancing weight to rotate can save or reduce the standard, and the balancing weight structure is facilitated to be simplified.

The balancing weight rotates around the vertical direction, and the height of the whole machine is unchanged when the balancing weight rotates, so that the height of the crane is not limited by the road.

The balancing weight is arranged at the tail part of the machine frame 100, and the redundant space at the tail part of the machine frame 100 can be fully utilized.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.