CN116101914A

CN116101914A - Crane with crane body

Info

Publication number: CN116101914A
Application number: CN202310132935.4A
Authority: CN
Inventors: 周玉龙; 韩雷; 侯文礼; 宋世全
Original assignee: Construction Machinery Branch of XCMG
Current assignee: Construction Machinery Branch of XCMG
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-05-12
Also published as: WO2024169322A1

Abstract

The present disclosure relates to a crane, comprising: the device comprises a chassis, a turntable, a mast, an arm support and an amplitude changing mechanism, wherein the turntable is rotatably arranged on the chassis, the mast and the arm support are both rotatably arranged on the turntable, the mast is connected with the arm support through a second traction piece, and the amplitude changing mechanism is arranged on the turntable and is used for changing amplitude of the arm support; wherein the horn comprises: the connecting frame is arranged on the turntable; the guide pulley assembly is arranged on the connecting frame; the amplitude pulley assembly is arranged on the turntable and is lower than the arrangement position of the guide pulley assembly; and the stay cord driving component is used for leading out and driving the variable amplitude stay cord connected with the mast and enabling the variable amplitude stay cord to pass through the guide pulley assembly and the variable amplitude pulley assembly.

Description

Crane with crane body

Technical Field

The disclosure relates to the field of engineering machinery, and in particular relates to a crane.

Background

Construction efficiency is a very critical technical index in engineering applications. Along with the continuous change of construction scene, for example green petrochemical upgrade transformation, municipal construction etc. has put forward higher demand to narrow and small space operation adaptability, the efficiency of construction etc. of hoist.

According to the definition of the main structure of the crane under different working conditions of the national standard, the working conditions of the crane comprise a standard working condition without a super-lifting mechanism and a super-lifting working condition with a super-lifting mechanism. The cranes corresponding to these two types of working conditions differ in terms of structural form and working principle. Compared with super-lifting working condition construction, standard working condition construction does not need to disassemble and assemble the super-lifting device, the component quantity is less, the cost is lower, the working efficiency is higher, and the adaptability to the operation in a narrow space of the crane is better.

In the luffing system of the standard working condition crane, the luffing pulley block is arranged at the tail part of the turntable and is connected with the head part of the mast through the luffing steel wire rope, and an important index of the luffing system capacity is luffing moment which is equal to the product of luffing force and the force arm. Meanwhile, in order to improve the stability of the whole machine under the standard working condition, an additional counterweight is added at the tail part of the turntable, so that the anti-overturning moment of the whole machine is improved.

Disclosure of Invention

The inventor finds that the luffing system of the standard working condition crane is limited by the luffing system capacity and the stability of the whole crane, the long arm is difficult to lift, the maximum length of the arm support is limited, and the maximum lifting capacity of the whole crane cannot be exerted. If the amplitude-variable hoisting torque is increased by increasing the amplitude-variable hoisting tension, the output power of a hoisting speed reducer is required to be increased, and the requirements on the bearing capacity of the mast and the amplitude-variable steel wire rope are simultaneously raised. If the luffing moment arm is increased by increasing the mast length and turret length, the turret and mast need to be lengthened. Both of these approaches, whether new product development or old product retrofit, will result in significant increases in the development cycle and cost of the crawler crane.

In view of this, the embodiment of the disclosure provides a crane, which can improve the capability of the luffing system of the whole crane under standard working conditions.

In one aspect of the present disclosure, there is provided a crane comprising: the device comprises a chassis, a turntable, a mast, an arm support and an amplitude changing mechanism, wherein the turntable is rotatably arranged on the chassis, the mast and the arm support are both rotatably arranged on the turntable, the mast is connected with the arm support through a second traction piece, and the amplitude changing mechanism is arranged on the turntable and is used for changing amplitude of the arm support; wherein the horn comprises:

the connecting frame is arranged on the turntable;

the guide pulley assembly is arranged on the connecting frame;

the amplitude pulley assembly is arranged on the turntable and is lower than the arrangement position of the guide pulley assembly; and

the stay cord driving component is used for leading out and driving an amplitude variation stay cord connected with the mast and enabling the amplitude variation stay cord to pass through the guide pulley assembly and the amplitude variation pulley assembly.

In some embodiments, a projection point of the guide pulley assembly on the luffing plane of the arm support is D, a projection point of the connection position of the luffing pulley assembly and the turntable on the luffing plane of the arm support is C, a projection point of the connection position of the mast and the luffing rope on the luffing plane of the arm support is a, and a projection point of the connection position of the mast and the turntable on the luffing plane of the arm support is B; in at least part of the working stroke of the mast, the proxel D is located on the side of the proxel line AC remote from the proxel B.

In some embodiments, the proxel D is located on the side of the proxel line AC remote from proxel B throughout the working stroke of the mast.

In some embodiments, the connection frame is detachably disposed on the turntable.

In some embodiments, the connector is attached to the rear of the turntable.

In some embodiments, the connecting frame is detachably connected with the tail vertical end face of the turntable, and is located on one side, away from the arm support, of a plane on which the tail vertical end face is located.

In some embodiments, the connector includes a truss structure.

In some embodiments, the crane further comprises:

the counterweight mounting device is connected with the connecting frame; and

and the counterweight system is arranged on the counterweight mounting device and is configured to provide counterweight for the crane.

In some embodiments, the weight mounting device comprises:

one end of the mounting frame is rotatably connected with the connecting frame, and the other end of the mounting frame is connected with the connecting frame through a first traction piece;

the first traction piece is positioned on the upper side of the mounting frame, and the counterweight system is adjustably arranged on the mounting frame.

In some embodiments, the weight mounting device further comprises:

the moving mechanism is movably arranged on the mounting frame; and

and the lifting mechanism is arranged on the moving mechanism and is connected with the counterweight system.

In some embodiments, the weight mounting device further comprises:

and the driving mechanism is connected between the moving mechanism and the connecting frame and is configured to drive the moving mechanism to move on the surface of the mounting frame relative to the connecting frame.

In some embodiments, the direction of movement of the movement mechanism is parallel to the horizontal plane and perpendicular to the luffing axis of the boom.

In some embodiments, the connector comprises:

the truss girder is provided with a first end, a second end and a third end, the first end is connected with the turntable, and the second end and the third end are respectively connected with the mounting frame and the first traction piece; and

and one end of the supporting rod is connected with the turntable, and the other end of the supporting rod is connected with the truss girder or the mounting frame.

In some embodiments, the guide pulley assembly is located at the third end.

In some embodiments, the weight mount device is removably connected to the connection frame.

Therefore, according to the embodiment of the disclosure, a connecting frame and an amplitude changing pulley assembly are arranged on the turntable, a guide pulley assembly is arranged on the connecting frame, the amplitude changing pull rope is led out by the stretching driving component to be connected with the mast, and the amplitude changing pull rope passes through the guide pulley assembly and the amplitude changing pulley assembly. Because the setting position of the amplitude-changing pulley assembly is lower than the setting position of the guide pulley, the rope outlet point of the amplitude-changing rope led to the mast by the guide pulley assembly is improved, compared with the lower rope outlet point of the amplitude-changing pulley assembly led to the mast directly by the related art, the arm of force of the amplitude-changing rope can be increased, so that the amplitude-changing moment is improved under the condition of not increasing the tension of the amplitude-changing rope, the capacity of the amplitude-changing system is improved, the requirements on the bearing capacity, the length and the like of the mast, the amplitude-changing rope and the turntable are reduced, and the cost is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural view of some embodiments of a crane according to the present disclosure;

FIG. 2 is a schematic illustration of the position of the projection points of the components on the luffing plane for counterweight adjustment according to an embodiment of the crane of the disclosure;

FIG. 3 is an enlarged schematic view of a crane embodiment according to the present disclosure in a turret tail region;

FIG. 4 is a schematic diagram of the force analysis of FIG. 3;

FIG. 5 is a force analysis schematic of the connector of FIG. 4;

FIG. 6 is a schematic diagram of a construction of a crane according to an embodiment of the disclosure upon removal of a counterweight mounting device and counterweight system;

fig. 7 is a schematic diagram of a construction of a crane according to an embodiment of the disclosure upon removal of a link and guide pulley assembly.

It should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale. Further, the same or similar reference numerals denote the same or similar members.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

In this disclosure, when a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device. When it is described that a particular device is connected to other devices, the particular device may be directly connected to the other devices without intervening devices, or may be directly connected to the other devices without intervening devices.

All terms (including technical or scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

As shown in fig. 1-5, embodiments of the present disclosure provide a crane. The crane comprises a chassis 11, a turret 12, a mast 13, a boom 14 and an amplitude variation mechanism 20.

The chassis 11 may be a crawler chassis, or may be another type of chassis, such as a wheeled crane chassis or a circular rail type chassis. The chassis 11 may travel on the work site or may be fixed to the work site. The crane may be a crawler crane, an automobile crane or a track crane, depending on the type of chassis employed.

The turntable 12 is rotatably arranged on said chassis 11, for example by means of a swivel body mounted on the chassis 11, rotatable relative to the chassis 11 about a vertical axis perpendicular to the horizontal plane. Depending on the stability requirements of the crane, fixed counterweights may or may not be provided on the turntable 12.

The mast 13 and the boom 14 are both rotatably arranged on the turntable 12, the mast 13 being connected to the boom 14 by means of a second pull 15. The masts 13 may be single masts or may be arranged in pairs. Boom 14 may include a main arm, a sub-arm that is removably attached to the main arm, and the like.

The second pulling member 15 may be a pulling plate or a pulling rope or the like. One end of the second pulling member 15 may be connected to the arm head or the arm body of the arm support 14, and the other end may be connected to the end of the mast 13 on the side away from the turntable 12. The number of second pullers 15 may be the same as the number of masts 13.

An amplitude variation mechanism 20 is arranged on the turntable 12 for realizing amplitude variation of the arm support 14. The horn 20 is operable to rotate the mast 13 relative to the turret 12 by pulling on the mast 13. As the mast 13 rotates, the boom 14 is driven to change amplitude by the second traction member 15. The boom 14 has a range of amplitude corresponding to the full working stroke of the mast 13.

The horn 20 includes a connecting frame 21, a guide pulley assembly 22, a horn pulley assembly 23, and a pull cord drive assembly 24. A connection frame 21 is provided on the turntable 12. A guide pulley assembly 22 is provided on the coupling frame 21. A luffing sheave assembly 23 is disposed on the turntable 12 below the location of the guide sheave assembly 22.

The stay cord driving part 24 is used for leading out and driving the luffing stay cord 25 connected with the mast 13, and making the luffing stay cord 25 pass through the guide pulley assembly 22 and the luffing pulley assembly 23. The variable amplitude pulling rope 25 can be a wire rope or a pulling rope made of other materials. The luffing ropes 25 may be connected to a pulley block at the end of the mast 13. The rope drive part 24 may include an amplitude varying winding mechanism driven by a motor or an internal combustion engine, and the amplitude varying rope is wound and unwound by rotation of a spool of the amplitude varying winding mechanism.

Referring to fig. 1, the guide pulley assembly 22 may be disposed at the top end of the connecting frame 21, or may be disposed at another position of the connecting frame 21, which is higher than the position where the amplitude pulley assembly 23 is disposed. The luffing rope 25 bypasses the guide pulley assembly 22 and the luffing pulley assembly 23 and may form a quadrilateral with the turntable 12 and the mast 13. In some embodiments, the guide pulley assembly 22 is provided in a plurality and is positioned at different positions of the connecting frame 21, so that the amplitude pulling rope 25 bypasses the guide pulley assembly 22 and the amplitude pulley assembly 23 and can form a polygon with the turntable 12 and the mast 13.

The length of the luffing rope between the guide pulley assembly 22 and the pulley block on the mast 13 can be reduced or increased by the retraction of the luffing rope 25 by the rope driving component 24. Under the condition that the guide pulley assembly 22 and the turntable 12 are kept motionless, the mast 13 rotates relative to the turntable 12 along with the retraction of the variable-amplitude pull rope so as to drive the arm support 14 to change amplitude, and the adjustment of the pitching angle of the arm support 14 is realized.

For a crane, an important indicator of luffing system capacity is luffing moment. The luffing moment is equal to the product of luffing force and the arm of force. Referring to fig. 2, the dashed line with double arrows is the moment arm L2' of the horn system of the related art, and the solid line with double arrows is the moment arm L2 of the horn of the presently disclosed embodiment. Because the guide pulley assembly 22 positioned at the top end of the connecting frame 21 is higher than the amplitude pulley assembly 23 on the turntable, the force arm L2 is larger than the force arm L2', so that the amplitude moment provided by the embodiment of the disclosure is higher on the premise of the same amplitude force, and the capacity of an amplitude system is obviously improved.

Compared with the prior art that the lower rope outlet point of the mast is directly led from the amplitude pulley assembly, the amplitude pulling rope can be increased in the embodiment, so that the amplitude pulling moment is improved under the condition that the pulling force of the amplitude pulling rope is not increased, the capacity of an amplitude system is improved, and the requirements on the carrying capacity, the length and the like of the mast, the amplitude pulling rope and the turntable are reduced.

In the working process of the whole machine, the rope outlet point of the amplitude-variable stay rope is increased, the arm of force of the amplitude-variable stay rope is increased, and a mechanism with smaller amplitude-variable force is allowed to be used at the moment, so that the requirements on the carrying capacity, the length and the like of the mast, the amplitude-variable stay rope and the rotary table are reduced, and the cost and the research and development period are reduced.

The embodiment of the disclosure can be applied to a crane without a super lifting mechanism under standard working conditions. For example, in the national standard GB/T14560, the standard operating conditions of a crawler crane are those of a crane without a superlift mechanism. The crane under the standard working condition has the advantages of fewer parts, lower purchase, use and transportation costs, and higher disassembly and assembly and operation efficiencies. Its existing luffing system capability may be enhanced by the luffing mechanism in embodiments of the present disclosure.

The plane shown in fig. 2 is the luffing plane of boom 14. Referring to fig. 1 and 2, the projection point of the guide pulley assembly 22 on the luffing plane of the boom 14 is D, the projection point of the connection position of the luffing pulley assembly 23 and the turntable 12 on the luffing plane of the boom 14 is C, the projection point of the connection position of the mast 13 and the luffing rope 25 on the luffing plane of the boom 14 is a, and the projection point of the connection position of the mast 13 and the turntable 12 on the luffing plane of the boom 14 is B.

As the mast 13 rotates, the proxel a also shifts position accordingly. The proxel D is located on the side of the proxel line AC remote from the proxel B during at least part of the working stroke of the mast 13. This allows the force arm L2 to be always greater than the force arm L2' during at least part of the working stroke of the mast 13, so that the luffing moment of the luffing rope is lifted during at least part of the luffing range of the boom 14. Preferably, the proxel D is located on the side of the proxel line AC remote from the proxel B throughout the entire working stroke of the mast 13 (e.g., the mast 13 working stroke corresponds to a rotation angle of 90 ° to 100 ° in fig. 2).

Referring to fig. 1-2, to improve the stability of the crane during standard operating conditions, in some embodiments, the crane further includes a counterweight mounting device 30 and a counterweight system 40. The weight mounting device 30 is connected to the connection frame 21. A counterweight system 40 is provided on the counterweight mounting device 30 and is configured to provide counterweight to the crane. The weight system 40 may include one or more weights and the number of weights may be increased or decreased as desired or the gauge of the weights may be adjusted.

Referring to fig. 2 and 3, in some embodiments, the weight mount device 30 includes a mount 31. One end of the mounting frame 31 is rotatably connected to the connection frame 21, and the other end is connected to the connection frame 21 through a first pulling member 32. The first pulling member 32 is located on the upper side of the mounting frame 31, and the counterweight system 40 is adjustably disposed on the mounting frame 31. The first pulling member 32 may be a pulling plate or a pulling rope.

Compared with the fixed additional counterweight commonly used in the related art, the position of the counterweight system on the mounting frame is adjustable, so that the generated anti-overturning moment is adjusted according to actual requirements under the same counterweight condition. For convenience of explanation, the remainder capable of generating an anti-overturning moment such as the weight of the turntable or the like is omitted herein. In fig. 2, the crawler wheel on the right side of the chassis corresponds to the whole machine overturning line when the boom is on the right side. For the counterweight system 40 located on the left side of the turntable, the distance of the counterweight system 40 to the complete machine overturning line is L1 or L1', depending on its specific location.

An important index of the anti-overturning capability of the whole machine is anti-overturning moment. The anti-overturning moment of the whole machine is equal to the product of the weight of the counterweight system and the distance from the counterweight system to the overturning line of the whole machine.

For example, the counterweight system 40 may be pushed to a position further from the turntable when it is desired to provide a greater anti-overturning moment during lifting. The complete hoisting does not need the big anti-overturning moment, and the additional counter weight needs to be lifted off the ground when the complete machine shifts, and when the counter weight system is in the position, the complete machine is easy to tilt backwards, and the counter weight system 40 can be retracted to a position close to the turntable at the moment, and the anti-overturning moment provided by the counter weight system is small at the moment, so that the complete machine shifts and the counter weight system is not easy to tilt off the ground, and repeated disassembly counter weights are not needed.

Because the counterweight system 40 can realize pushing, the anti-overturning distance provided by the counterweight system is obviously increased, and the counterweight system can be dynamically adjusted from time to time according to the actual hoisting weight and different postures in the hoisting process, so that the gravity center of the whole crane is ensured to be in a safer and more reasonable range on the premise of safety. The sample embodiment fully utilizes the connecting frame in the amplitude variation mechanism to be connected with the fixed counterweight mounting device, and solves two difficult problems of amplitude variation system capacity and complete machine stability of limiting the arm length and performance improvement of the crane under standard working conditions through a relatively compact structure.

Referring to fig. 3 and 4, in some embodiments, the weight mounting device 30 further includes: a moving mechanism 33 and a lifting mechanism 34. A moving mechanism 33 is movably provided on the mount 31. The moving mechanism 33 may be a trolley that moves on the upper surface of the mount 31, and the trolley moves by rolling of rollers on the mount 31. The moving mechanism 33 may slide directly on the mount 31.

The lifting mechanism 34 is arranged on the displacement mechanism 33 and is connected to the counterweight system 40. The lifting mechanism 34 can lower the weight system 40 down to the ground or lift the weight system 40 up to separate from the ground, thereby facilitating the adjustment of the weight system due to uneven ground or the landing or grounding requirement of the weight system during the whole machine operation. The lifting mechanism 34 may be configured to extend and retract from a lift cylinder to effect lifting, or may be configured to be configured as other types of lifting mechanisms, such as pneumatic or electric lifting mechanisms.

In fig. 3, the weight mount device 30 may further include a driving mechanism 35. A driving mechanism 35 is connected between the moving mechanism 33 and the link 21, and is configured to drive the moving mechanism 33 to move on the surface of the mount 31 with respect to the link 21. The drive mechanism 35 may employ an oil cylinder to push or pull the movement mechanism 33, or may employ other types of drive mechanisms, such as pneumatic or electric push-pull mechanisms, etc.

Referring to fig. 2, in some embodiments, the direction of movement v of the movement mechanism 33 is parallel to the horizontal plane and perpendicular to the luffing axis of the boom 14. In this way the displacement device 33 can more quickly adjust the distance of the counterweight system from the turntable.

Fig. 6 is a schematic view of the construction of a crane according to an embodiment of the disclosure when removing a counterweight mounting device and a counterweight system. Referring to fig. 3, 4 and 6, the weight mounting device 30 is detachably connected to the connection frame 21. In this way, the crane may be deformed in some situations by removing the counterweight mounting device and counterweight system, the removed drawing being seen in fig. 6. At this time, the space occupation can be reduced under the condition of less overturning risk.

In fig. 2, the connecting frame 21 is connected to the tail 121 of the turntable 12, which is advantageous for providing a counterweight mounting device and a counterweight system, and for improving the rope outlet point of the luffing rope. The connecting frame 21 is detachably connected with the tail vertical end surface of the turntable 12, and is located at one side of the plane of the tail vertical end surface, which is far away from the arm support 14.

In some embodiments, the connector 21 includes a truss structure that reduces the weight of the connector. Referring to fig. 3, the connection frame 21 may include truss girders 211 and support bars 212. The truss girder adopts a truss structure, and the truss girder has lighter weight. The truss beam 211 has a first end 211a, a second end 211b and a third end 211c, the first end 211a being connected to the turntable 12, the second end 211b and the third end 211c being connected to the mounting frame 31 and the first pulling member 32, respectively. The truss girder can be hinged at the tail of the turntable 12, the height position of the guide pulley assembly can be conveniently adjusted, and the truss girder can be conveniently installed or disassembled.

The support bar 212 is located at the lower side of the truss beam 211, one end of the support bar 212 is connected to the turntable 12, and the other end is connected to the truss beam 211 or the mounting frame 31. This structure ensures the stability of the counterweight system 40 on the mount 31. The support rods 212 can stably support the truss girder 211, and can be used for matching the position of the truss girder 211 according to different length specifications.

Figure 4 shows a simplified force analysis of the truss girder 211. For the counterweight system, the support action (force F _z2 ) And the pulling force of the first pulling member 32 (force F _i2 ) The action enables the weight system 40 (force G) to be lifted off the ground, thereby performing a pushing function. The first pulling member 32 is connected to the third end 211c of the truss beam 211, and the guide pulley assembly 22 may be disposed at the third end 211c, with such a configuration of the point of interaction that the luffing rope 25 applies a force F at the third end 211c _bf2 With force F _i1 The directions are basically opposite, so that part of interaction force can be offset, and the stress is reasonable, thereby being safer and more reliable.

The truss girder 211 lifts the rope outlet point (i.e., the third end 211 c) of the luffing rope 25, and the pulling force F of the first pulling member 32 _i1 And the pulling force F of the luffing pull rope 25 _bf2 The angles to the truss beam 211 are both large and all form obtuse angles, so that neither force will exert pressure on the truss beam 211. Pulling force F of amplitude-variable pulling rope 25 only _bf1 An acute angle to the truss girder 211 may generate pressure on the truss girder 211. But force F _i1 And F _bf2 The stress decomposition directions along the truss girder 211 are opposite to the stress bearing directions, so that the stress of the truss girder 211 can be relieved, the stress of structural members can be improved, and the overall stress is more reasonable, safer and more reliableThe structural member is also lighter. In FIG. 4, force F _i1 And F _i2 To equal and opposite forces, force F _z1 Force F of sum _z2 Is equal and opposite in force and reaction force.

Specifically, referring to fig. 5, the pulley axis of the guide pulley assembly is used as a center, the direction from the hinge point of the truss beam 211 on the turntable to the center is used as a y-axis, and the direction perpendicular to the y-axis is used as an x-axis. And carrying out stress decomposition under a coordinate system formed by an x axis and a y axis. Force F _i1 And F _bf2 Component force F of both in x-axis _i1x And F _bf2x In opposite directions, the portions may cancel each other out. Force F _i1 And F _bf1 Component force F of both in x-axis _i1x And F _bf1x In opposite directions, the portions may cancel each other out. Force F _i1 And F _bf1 /F _bf2 Component force F of the three on y axis _i1y And F _bf1y /F _bf2y Of only component F _bf1y Will generate pressure and force component F on the truss girder 211 _i1y And F _bf1y Counteracting part of the pressure in the opposite direction. Through this kind of arrangement, be favorable to the atress of structure more for whole atress is more reasonable, and is more safe and reliable, and the structure is lighter.

Fig. 7 is a schematic diagram of a construction of a crane according to an embodiment of the disclosure upon removal of a link and guide pulley assembly. Referring to fig. 6 and 7, in some embodiments, the attachment frame 21 is removably disposed on the turntable 12. Under the working condition that the arm support is short or certain lifting is not needed, the conventional crane structure can be recovered by removing the connecting frame and the guide pulley assembly.

Thus, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A crane, comprising: the device comprises a chassis (11), a turntable (12), a mast (13), an arm support (14) and an amplitude variation mechanism (20), wherein the turntable (12) is rotatably arranged on the chassis (11), the mast (13) and the arm support (14) are rotatably arranged on the turntable (12), the mast (13) is connected with the arm support (14) through a second traction piece (15), and the amplitude variation mechanism (20) is arranged on the turntable (12) and is used for realizing amplitude variation of the arm support (14); wherein the horn (20) comprises:

a connection frame (21) provided on the turntable (12);

a guide pulley assembly (22) provided on the connection frame (21);

a luffing pulley assembly (23) arranged on the turntable (12) and lower than the arrangement position of the guide pulley assembly (22); and

and the stay cord driving component (24) is used for leading out and driving a luffing stay cord (25) connected with the mast (13) and winding the luffing stay cord (25) around the guide pulley assembly (22) and the luffing pulley assembly (23).

2. Crane according to claim 1, wherein the projection point of the guide pulley assembly (22) on the luffing plane of the boom (14) is D, the projection point of the connection position of the luffing pulley assembly (23) with the turntable (12) on the luffing plane of the boom (14) is C, the projection point of the connection position of the mast (13) with the luffing rope (25) on the luffing plane of the boom (14) is a, and the projection point of the connection position of the mast (13) with the turntable (12) on the luffing plane of the boom (14) is B; the proxel D is located on the side of the proxel line AC remote from the proxel B during at least part of the working stroke of the mast (13).

3. Crane according to claim 2, characterized in that the projection point D is located on the side of the projection point connection AC remote from the projection point B during the entire working stroke of the mast (13).

4. Crane according to claim 1, characterized in that the connection frame (21) is detachably arranged on the turntable (12).

5. Crane according to claim 1, characterized in that the connection frame (21) is connected to the tail (121) of the turret (12).

6. Crane according to claim 5, characterized in that the connecting frame (21) is detachably connected to the end surface of the turret (12) and is located on the side of the plane of the end surface remote from the boom (14).

7. Crane according to claim 5, characterized in that the connection frame (21) comprises a truss structure.

8. The crane of claim 1, further comprising:

a counterweight mounting device (30) connected to the connection frame (21); and

a counterweight system (40) disposed on the counterweight mounting device (30) and configured to provide counterweight to the crane.

9. Crane according to claim 8, wherein the counterweight mounting device (30) comprises:

a mounting frame (31), one end of which is rotatably connected with the connecting frame (21), and the other end of which is connected with the connecting frame (21) through a first traction piece (32);

the first traction piece (32) is positioned on the upper side of the mounting frame (31), and the counterweight system (40) is arranged on the mounting frame (31) in a position-adjustable mode.

10. Crane according to claim 9, wherein the counterweight mounting device (30) further comprises:

a moving mechanism (33) movably provided on the mount (31); and

and the lifting mechanism (34) is arranged on the moving mechanism (33) and is connected with the counterweight system (40).

11. Crane according to claim 10, wherein the counterweight mounting device (30) further comprises:

and a driving mechanism (35) connected between the moving mechanism (33) and the connecting frame (21) and configured to drive the moving mechanism (33) to move on the surface of the mounting frame (31) relative to the connecting frame (21).

12. Crane according to claim 10, wherein the displacement direction of the displacement means (33) is parallel to the horizontal plane and perpendicular to the luffing axis of the boom (14).

13. Crane according to claim 9, wherein the connection frame (21) comprises:

a truss beam (211) having a first end (211 a), a second end (211 b) and a third end (211 c), said first end (211 a) being connected to said turntable (12), said second end (211 b) and said third end (211 c) being connected to said mounting frame (31) and to said first pulling member (32), respectively; and

the support rod (212) is positioned at the lower side of the truss girder (211), one end of the support rod (212) is connected with the turntable (12), and the other end of the support rod is connected with the truss girder (211) or the mounting frame (31).

14. Crane according to claim 13, characterized in that the guide pulley assembly (22) is located at the third end (211 c).

15. Crane according to claim 8, wherein the counterweight mounting device (30) is detachably connected to the connection frame (21).