CN116101914A - crane - Google Patents

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

technical field

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

Background technique

Construction efficiency is a very critical technical indicator in engineering applications. With the continuous changes of construction scenarios, such as green petrochemical upgrading and municipal construction, etc., higher requirements are put forward for the crane's adaptability to small space operations and construction efficiency.

According to the definition of the main structure of the crane under different working conditions in the national standard, the working conditions of the crane include the standard working condition without the superlift mechanism and the superlift working condition with the superlift mechanism. Cranes corresponding to these two types of operating conditions are different in structure and working principle. Compared with construction under super-lifting conditions, construction under standard working conditions does not require disassembly and assembly of super-lifting devices, with fewer components, lower cost, higher operating efficiency, and better adaptability to the narrow space of the crane.

In the luffing system of the crane under standard working conditions, the luffing pulley block is installed at the tail of the turntable and connected to the mast head through the luffing wire rope. The important index of the luffing system capacity is the luffing torque, which is equal to the luffing force and the The product of the arms. At the same time, in order to improve the stability of the whole machine under standard working conditions, an additional counterweight is added to the tail of the turntable to increase the anti-overturning moment of the whole machine.

Contents of the invention

The inventor found through research that the luffing system of the crane under standard working conditions is limited by the capability of the luffing system and the stability of the whole machine. It is difficult to lift the long arm, which limits the maximum length of the jib and cannot exert the maximum hoisting capacity of the whole machine. ability. If the torque of the luffing winch is increased by increasing the pulling force of the luffing winch, it is necessary to increase the output power of the reducer of the hoisting, which will simultaneously put forward higher requirements on the bearing capacity of the mast and the luffing wire rope. If the luffing jib is increased by increasing the length of the mast and turntable, the turntable and mast need to be made longer. Whether it is new product development or old product restructuring, these two methods will lead to a significant increase in the research and development cycle and cost of crawler cranes.

In view of this, an embodiment of the present disclosure provides a crane capable of improving the luffing system capability of the whole machine under standard working conditions.

In one aspect of the present disclosure, a crane is provided, including: a chassis, a turntable, a mast, a jib and a luffing mechanism, the turntable is rotatably arranged on the chassis, and the mast and the jib can be It is rotatably arranged on the turntable, the mast is connected to the jib through a second pulling member, and the luffing mechanism is arranged on the turntable to realize the luffing of the jib; wherein, The amplitude changing mechanism includes:

The connecting frame is arranged on the turntable;

a guide pulley assembly, arranged on the connecting frame;

a luffing pulley assembly, arranged on the turntable, and lower than the installation position of the guide pulley assembly; and

The stay rope driving part is used to lead out and drive the luffing stay rope connected with the mast, and make the luffing stay rope go around the guide pulley assembly and the luffing pulley assembly.

In some embodiments, the projection point of the guide pulley assembly on the luffing plane of the jib is D, and the connection position between the luffing pulley assembly and the turntable is on the luffing plane of the jib The projection point of the mast is C, the projection point of the connection position of the mast and the luffing rope on the luffing plane of the jib is A, and the connection position of the mast and the turntable is at the jib The projection point on the luffing plane is B; within at least part of the working stroke of the mast, the projection point D is located on the side of the projection point line AC away from the projection point B.

In some embodiments, during the entire working stroke of the mast, the projection point D is located on the side of the projection point connecting line AC away from the projection point B.

In some embodiments, the connecting frame is detachably arranged on the turntable.

In some embodiments, the connecting frame is connected to the tail of the turntable.

In some embodiments, the connecting frame is detachably connected to the upright end surface of the tail part of the turntable, and is located on a side of the plane where the upright end surface of the tail part is away from the jib.

In some embodiments, the connecting frame comprises a truss structure.

In some embodiments, the crane also includes:

a counterweight mount connected to the connecting frame; and

A counterweight system, arranged on the counterweight mounting device, is configured to provide counterweight to the crane.

In some embodiments, the counterweight mounting device includes:

A mounting frame, one end is rotatably connected to the connecting frame, and the other end is connected to the connecting frame through a first pulling member;

Wherein, the first pulling member is located on the upper side of the hanger, and the counterweight system is arranged on the hanger in an adjustable position.

In some embodiments, the counterweight mounting device also includes:

a moving mechanism, movably arranged on the rack; and

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

In some embodiments, the counterweight mounting device also includes:

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

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

In some embodiments, the connector includes:

The truss beam has a first end, a second end and a third end, the first end is connected to the turntable, the second end and the third end are respectively connected to the mounting frame and the first puller connections; and

The support rod is located at the lower side of the truss beam, one end of the support rod is connected to the turntable, and the other end is connected to the truss beam or the mounting frame.

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

In some embodiments, the counterweight mounting device is detachably connected to the connecting frame.

Therefore, according to an embodiment of the present disclosure, the connecting frame and the luffing pulley assembly are arranged on the turntable, and the guide pulley assembly is arranged on the connecting frame, the stretching driving part draws out the luffing stay rope to connect the mast, and the luffing stay rope winds Through guide pulley assembly and luffing pulley assembly. Since the setting position of the luffing pulley assembly is lower than the setting position of the guide pulley, the cable exit point of the luffing pulley leading to the mast through the guide pulley assembly is improved, compared with the direct guide from the luffing pulley assembly to the mast in the related art The lower rope outlet point can increase the moment arm of the luffing stay rope, thereby increasing the luffing torque without increasing the tension of the luffing stay rope, which is conducive to improving the capability of the luffing system and reducing the impact on the mast. , Luffing rope, turntable load capacity and length requirements, which is also conducive to reducing costs.

Description of drawings

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

The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

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

Fig. 2 is a schematic diagram of the adjustment of the counterweight and the position of the projection point of each component on the luffing plane according to the crane embodiment of the present disclosure;

Fig. 3 is an enlarged schematic view of the tail area of the turntable according to an embodiment of the crane of the present disclosure;

Fig. 4 is the force analysis schematic diagram of Fig. 3;

Fig. 5 is a schematic diagram of force analysis of the connecting frame in Fig. 4;

Fig. 6 is a structural schematic view of the crane according to the embodiment of the present disclosure when the counterweight mounting device and the counterweight system are removed;

Fig. 7 is a structural schematic view of the crane according to the embodiment of the present disclosure when the connecting frame and the guide pulley assembly are removed.

It should be understood that the sizes of the various parts shown in the drawings are not drawn according to the actual scale relationship. In addition, the same or similar reference numerals denote the same or similar components.

Detailed ways

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 illustrative only, and in no way restricts the disclosure, its application or uses. The present disclosure can be implemented in many different forms and is not limited to the embodiments described here. Rather, 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 relative arrangements of parts and steps, compositions of materials, numerical expressions and numerical values set forth in these embodiments should be interpreted as illustrative only and not as limiting, unless specifically stated otherwise.

"First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. Words like "comprising" or "comprising" mean that the elements preceding the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intervening device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other device without an intervening device, or may not be directly connected to the other device but has an intervening device.

All terms (including technical terms or scientific terms) used in the present disclosure have the same meaning as understood by one of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general-purpose dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in idealized or extremely formalized meanings, unless explicitly stated herein Defined like this.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

As shown in FIGS. 1 to 5 , an embodiment of the present disclosure provides a crane. The crane includes a chassis 11 , a turntable 12 , a mast 13 , a boom 14 and a luffing mechanism 20 .

The chassis 11 can be a crawler chassis, or other forms of chassis, such as a wheeled crane chassis or a ring-rail chassis. The chassis 11 can walk on the work site, and can also be fixed on the work site. Depending on the type of chassis used, the crane can be a crawler crane, truck crane or rail-mounted crane.

The turntable 12 is rotatably arranged on the chassis 11 , for example, mounted on the chassis 11 through a rotator, and can rotate relative to the chassis 11 around a vertical axis perpendicular to the horizontal plane. According to the stability requirements of the crane, the turntable 12 may or may not be provided with a fixed counterweight.

Both the mast 13 and the jib 14 are rotatably arranged on the turntable 12 , and the mast 13 is connected to the jib 14 through the second pulling member 15 . The mast 13 can be a single mast or can be arranged in pairs. The jib frame 14 may include a main arm, and may also include an auxiliary arm that can be attached to or detached from the main arm.

The second pulling member 15 can be a pulling board or a pulling rope. One end of the second pulling member 15 can be connected to the arm head or the arm body of the boom 14 , and the other end can be connected to the end of the mast 13 away from the turntable 12 . The number of second pulling members 15 may be the same as the number of masts 13 .

The amplitude-changing mechanism 20 is arranged on the turntable 12 for realizing the amplitude-changing of the jib 14 . The luffing mechanism 20 can make the mast 13 rotate relative to the turntable 12 by pulling the mast 13 . As the mast 13 rotates, the boom 14 is driven by the second pulling member 15 to change the amplitude. The amplitude range of the jib 14 corresponds to the entire working stroke of the mast 13 .

The luffing mechanism 20 includes a connecting frame 21 , a guide pulley assembly 22 , an luffing pulley assembly 23 and a cable driving part 24 . The connecting frame 21 is arranged on the turntable 12 . The guide pulley assembly 22 is arranged on the connecting frame 21 . The luffing pulley assembly 23 is arranged on the turntable 12 and is lower than the setting position of the guide pulley assembly 22 .

The rope driving part 24 is used to lead out and drive the luffing pulley 25 connected to the mast 13 , and make the luffing pulley 25 go around the guide pulley assembly 22 and the luffing pulley assembly 23 . The luffing stay rope 25 can be a steel wire rope or a stay rope made of other materials. The luffing stay rope 25 can be connected with the pulley block at the end of the mast 13 . The rope driving component 24 may include a luffing hoisting mechanism driven by a motor or an internal combustion engine, and the luffing hoisting rope is retracted by rotating the reel of the luffing hoisting mechanism.

Referring to FIG. 1 , the guide pulley assembly 22 can be arranged at the top of the connecting frame 21 , or at other positions of the connecting frame 21 , as long as its position is higher than that of the luffing pulley assembly 23 . The luffing pulley 25 bypasses the guide pulley assembly 22 and the luffing pulley assembly 23 , and can form a quadrilateral with the turntable 12 and the mast 13 . In some embodiments, there are multiple guide pulley assemblies 22 located at different positions of the connecting frame 21, then the luffing stay rope 25 bypasses the guide pulley assembly 22 and the luffing pulley assembly 23, and can be connected with the turntable 12 and the mast 13 Form polygons with more sides.

The length of the luffing cable 25 between the guide pulley assembly 22 and the pulley block on the mast 13 can be shortened or increased by the retraction of the luffing cable 25 by the cable driving part 24 . When the guide pulley assembly 22 and the turntable 12 remain stationary, the mast 13 rotates relative to the turntable 12 as the luffing rope is retracted to drive the jib 14 to luff and adjust the pitch angle of the jib 14 .

For cranes, the important indicator of luffing system capability is luffing moment. The luffing moment is equal to the product of the luffing force and the moment arm. Referring to FIG. 2 , the dotted line with double arrows is the moment arm L2' of the luffing system in the related art, and the solid line with double arrows is the moment arm L2 of the luffing mechanism in the embodiment of the present disclosure. Since the guide pulley assembly 22 at the top of the connecting frame 21 is higher than the luffing pulley assembly 23 on the turntable, the moment arm L2 is larger than the moment arm L2', so under the premise of the same luffing force, the embodiments of the present disclosure can provide variable The amplitude torque is higher, so that the capability of the luffing system is significantly improved.

Compared with the related art that leads directly from the luffing pulley assembly to the lower cable outlet point of the mast, the embodiments of the present disclosure can increase the moment arm of the luffing stay rope, thereby increasing the tension of the luffing stay rope Under certain circumstances, the luffing moment can be increased, which is beneficial to improving the capability of the luffing system and reducing the requirements for the carrying capacity and length of the mast, luffing rope, turntable, etc.

During the working process of the whole machine, the force arm of the luffing cable is increased by increasing the cable outlet point of the luffing cable, which allows the use of a mechanism with a smaller luffing force, thereby reducing the impact on the mast and the luffing cable. , the carrying capacity and length of the turntable are beneficial to reduce the cost and development cycle.

Embodiments of the present disclosure are applicable to cranes in standard working conditions without a superlift mechanism. For example, in the national standard GB/T14560, the standard working condition of a crawler crane is the working condition of a crane without a superlift mechanism. Cranes under standard working conditions use much fewer components, lower costs for purchase, use, and transportation, and higher disassembly and operation efficiency. The existing amplitude-changing system capability can be improved through the amplitude-changing mechanism in the embodiment of the present disclosure.

The plane shown in FIG. 2 is the luffing plane of the jib 14 . 1 and 2, the projection point of the guide pulley assembly 22 on the luffing plane of the jib 14 is D, and the connection position between the luffing pulley assembly 23 and the turntable 12 is on the luffing plane of the jib 14. The projection point on the luffing plane is C, the projection point of the connecting position of the mast 13 and the luffing stay rope 25 on the luffing plane of the jib 14 is A, and the mast 13 and the turntable The projection point of the connecting position of 12 on the luffing plane of the boom 14 is B.

As the mast 13 rotates, the projection point A also changes its position accordingly. During at least part of the working stroke of the mast 13 , the projected point D is located on the side of the projected point connecting line AC away from the projected point B. In this way, the moment arm L2 can always be greater than the moment arm L2' in at least part of the working stroke of the mast 13, so that the luffing moment of the luffing stay rope can be increased in at least part of the luffing range of the jib 14. Preferably, within the entire working stroke of the mast 13 (for example, the working stroke of the mast 13 in FIG. 2 corresponds to a rotation angle of 90° to 100°), the projection point D can be located on the line AC between the projection points and away from the projection point B. side.

Referring to FIGS. 1 to 2 , in order to improve the stability of the crane under standard working conditions, in some embodiments, the crane further includes a counterweight mounting device 30 and a counterweight system 40 . The counterweight mounting device 30 is connected to the connecting frame 21 . The counterweight system 40 is arranged on the counterweight mounting device 30 and is configured to provide counterweight to the crane. The counterweight system 40 may include one or more counterweights, and the number of counterweights may be increased or decreased, or the specifications of the counterweights may be adjusted, as required.

Referring to FIG. 2 and FIG. 3 , in some embodiments, the counterweight mounting device 30 includes a mounting frame 31 . One end of the hanging frame 31 is rotatably connected to the connecting frame 21 , and the other end is connected to the connecting frame 21 through the first pulling member 32 . The first pulling member 32 is located on the upper side of the hanging frame 31 , and the counterweight system 40 is arranged on the hanging frame 31 in an adjustable position. The first pulling member 32 can be a pulling plate or a pulling rope.

Compared with the fixed additional counterweight usually used in the related art, since the position of the counterweight system on the rack is adjustable, the generated anti-overturning moment can be adjusted according to the actual demand under the same counterweight condition. For the convenience of explanation, other factors that can generate anti-overturning moments, such as the weight of the turntable, are temporarily ignored here. In Figure 2, when the jib is on the right side, the crawler wheels on the right side of the chassis correspond to the overturning line of the whole machine. For the counterweight system 40 located on the left side of the turntable, according to its specific position, the distance from the counterweight system 40 to the overturning line of the complete machine is L1 or L1'.

An important indicator of the anti-overturning ability of the whole machine is the 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, when a large anti-overturning moment needs to be provided during hoisting, the counterweight system 40 can be pushed to a position farther away from the turntable. After the hoisting is completed, there is no need for such a large anti-overturning moment, and the additional counterweight needs to be lifted off the ground when the whole machine is displaced. Retract the counterweight system 40 to a position closer to the turntable. At this time, the anti-overturning moment that the counterweight system can provide is small, and it is not easy to tip over when the whole machine is shifted and the counterweight system is off the ground, so there is no need to repeat The disassembly and assembly weight.

Because the counterweight system 40 can be moved, the anti-overturning distance it can provide is significantly increased, and it can be dynamically adjusted from time to time according to the actual lifting weight and different attitudes during the lifting process, ensuring the safety of the whole machine The center of gravity is in a safer and more reasonable range. In this way, this embodiment makes full use of the connecting frame in the luffing mechanism to connect and fix the counterweight mounting device, which will limit the arm length of the crane under standard working conditions and improve the performance of the luffing system and the stability of the whole machine. Simultaneously solved by a relatively compact structure.

Referring to FIG. 3 and FIG. 4 , in some embodiments, the counterweight mounting device 30 further includes: a moving mechanism 33 and a lifting mechanism 34 . The moving mechanism 33 is movably arranged on the hanging frame 31 . The moving mechanism 33 can be a dolly that moves on the upper surface of the mounting frame 31 , and the dolly moves on the mounting frame 31 through rollers rolling. The moving mechanism 33 can also slide directly on the mounting frame 31 .

The lifting mechanism 34 is arranged on the moving mechanism 33 and connected with the counterweight system 40 . The lifting mechanism 34 can lower the counterweight system 40 down to the ground, or lift the counterweight system 40 upwards to make it off the ground, so as to facilitate the adjustment of the counterweight system due to uneven ground during installation or the counterweight system during the whole machine operation. ground lift or landing requirements. The lifting mechanism 34 can realize the lifting action by expanding and contracting the lifting oil cylinder, and also can adopt other forms of lifting mechanisms, such as pneumatic or electric lifting mechanisms.

In FIG. 3 , the counterweight mounting device 30 may further include a driving mechanism 35 . The driving mechanism 35 is connected between the moving mechanism 33 and the connecting frame 21 and is configured to drive the moving mechanism 33 to move relative to the connecting frame 21 on the surface of the mounting frame 31 . The driving mechanism 35 can use an oil cylinder to push or pull the moving mechanism 33, and also can use other forms of driving mechanisms, such as pneumatic or electric push-pull mechanisms.

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

Fig. 6 is a structural schematic view of the crane according to the embodiment of the present disclosure when the counterweight mounting device and the counterweight system are removed. Referring to FIG. 3 , FIG. 4 and FIG. 6 , the counterweight mounting device 30 is detachably connected to the connecting frame 21 . In this way, in some scenarios, the crane can be deformed and used by removing the counterweight mounting device and the counterweight system. See Figure 6 for the disassembled drawings. In this case, the space requirement can be reduced with less risk of tipping over.

In FIG. 2 , the connecting frame 21 is connected to the tail portion 121 of the turntable 12 , which facilitates setting up a counterweight mounting device and a counterweight system, and improves the rope exit point of the luffing stay rope. The connecting frame 21 is detachably connected to the upright end surface of the tail part of the turntable 12 , and is located on the side of the plane where the upright end surface of the tail part is away from the boom 14 .

In some embodiments, the connecting frame 21 includes a truss structure, which can reduce the weight of the connecting frame. Referring to FIG. 3 , the connecting frame 21 may include a truss beam 211 and a support rod 212 . The truss beam adopts a truss structure, which is lighter in weight. The truss beam 211 has a first end 211a, a second end 211b and a third end 211c, the first end 211a is connected to the turntable 12, the second end 211b and the third end 211c are respectively connected to the hanger The carrier 31 is connected to the first pulling member 32 . The truss girder can be hinged at the tail of the turntable 12, and the height position of the guide pulley assembly can be adjusted conveniently, and the installation or removal of the truss girder is also convenient.

The support rod 212 is located at the lower side of the truss beam 211 , one end of the support rod 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 can ensure the stability of the counterweight system 40 on the rack 31 . The support rod 212 can realize stable support for the truss beam 211 , and different length specifications can be selected to match the position of the truss beam 211 as required.

FIG. 4 shows a schematic diagram of force analysis of the truss beam 211 . For the counterweight system, the counterweight system 40 (force G) can lift off the ground through the supporting action of the support rod 212 (force F _z2 ) and the pulling force (force F _i2 ) of the first pulling member 32 , thereby realizing the pushing function. The first pulling member 32 is connected to the third end 211c of the truss girder 211, and the guide pulley assembly 22 can be arranged at the third end 211c. This common action point structure makes the luffing stay rope 25 apply at the third end 211c. The direction of the force F _bf2 is basically opposite to that of the force F _i1 , so that part of the interaction force can be offset, and the force is reasonable, so that it is safer and more reliable.

The truss beam 211 raises the cable exit point (ie, the third end 211c) of the luffing stay rope 25, and the tension F _i1 of the first pulling member 32 and the pulling force F _bf2 of the luffing stay rope 25 have the same angle as the truss beam 211. Both are obtuse angles, so neither of these two forces will generate pressure on the truss beam 211 . Only the pulling force F _bf1 of the luffing rope 25 forms an acute angle with the truss beam 211 , which will generate pressure on the truss beam 211 . However, the force decomposition directions of the forces F _i1 and F _bf2 along the truss beam 211 are opposite to the direction of the pressure, which can reduce the force of the truss beam 211, improve the force of the structural parts, and make the overall force more reasonable and safer. Reliable and structurally lighter. In Fig. 4, the forces F _i1 and F _i2 are action force and reaction force with equal magnitude and opposite direction, and the force F _z1 and force F _z2 are action force and reaction force with equal magnitude and opposite direction.

Specifically, referring to FIG. 5 , the axis of the pulley of the guide pulley assembly is the center of the circle, the direction from the hinge point of the truss beam 211 on the turntable to the center of the circle is the y-axis, and the direction perpendicular to the y-axis is the x-axis. The force decomposition is carried out in the coordinate system formed by the x-axis and the y-axis. The component forces F _i1x and F _bf2x of the forces F _i1 and F _bf2 on the x-axis are in opposite directions and can partially cancel each other out. The component forces F _i1x and F _bf1x of the forces F _i1 and F _bf1 on the x-axis are in opposite directions and can partially cancel each other out. Among the component forces F _i1y and F _bf1y /F _bf2y of the three forces F _i1 and F _bf1 /F _bf2 on the y-axis, only the component force F _bf1y will produce pressure on the truss beam 211, and the component forces F _i1y and F _bf1y will be in the opposite direction. Orientation offsets some of the pressure. This arrangement is more conducive to the stress of the structural parts, making the overall stress more reasonable, safer and more reliable, and the structural parts lighter.

Fig. 7 is a structural schematic view of the crane according to the embodiment of the present disclosure when the connecting frame and the guide pulley assembly are removed. Referring to FIG. 6 and FIG. 7 , in some embodiments, the connecting frame 21 is detachably arranged on the turntable 12 . In the case of short boom or some working conditions that do not need to be lifted, it can also be restored to the conventional crane structure by removing the connecting frame and guide pulley assembly.

So far, the embodiments of the present disclosure have been described in detail. Certain details known in the art have not been described in order to avoid obscuring the concept of the present disclosure. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only, rather than limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (15)

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).

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