CN218665138U - Amplitude changing device for crane and crane - Google Patents

Abstract

The utility model discloses a become width of cloth device and hoist for hoist, this width of cloth device includes: the first end of the main mast is rotatably connected with the front end of a rotary table of the crane; the pulley assembly comprises a first pulley block and a second pulley block which are arranged at the second end of the main mast; the steel wire rope is wound on the first pulley block and the second pulley block; the truss assembly is arranged at the rear end of the rotary table and extends backwards, and the second pulley block is arranged at the rear end of the truss assembly. The amplitude variation device for the crane and the crane have the advantages of being simple in structure, beneficial to reducing the tensile force borne by the steel wire rope and beneficial to improving the use stability.

Description

Luffing gear and cranes for cranes

technical field

The utility model relates to the technical field of cranes, in particular to a luffing device for a crane and the crane.

Background technique

The main luffing pulley block of the luffing device of the crane in the prior art is usually installed on the turntable. The pulling force is relatively large. In order to ensure the reliability of the luffing device, the use ratio or diameter of the wire rope needs to be increased, and the structural strength of the turntable needs to be enhanced to prevent the main luffing pulley block from falling out.

Utility model content

The purpose of this utility model is to provide a luffing device and a crane used for a crane, which have the advantages of simple structure, which is beneficial to reduce the tensile force on the steel wire rope, and is conducive to improving the stability of use .

In order to achieve the above purpose, the first aspect of the utility model provides a luffing device for a crane, the luffing device includes:

Main mast, the first end of the main mast is rotatably connected to the front end of the turntable of the crane;

a pulley assembly including a first block and a second block disposed on the second end of the main mast;

The steel wire rope is wound on the first pulley block and the second pulley block;

The truss assembly is arranged at the rear end of the turntable and extends backward, and the second pulley block is arranged at the rear end of the truss assembly.

In an embodiment of the present invention, the truss assembly includes a first truss arm and a second truss arm whose length can be adjusted, the front end of the first truss arm is hinged to the rear side of the turntable, and the front end of the second truss arm is arranged at intervals The front end of the first lattice arm is below and hinged with the rear side of the turntable, the rear end of the first lattice arm is connected to the rear end of the second lattice arm, and the second pulley block is arranged on the rear ends of the first lattice arm and the second lattice arm.

In the embodiment of the present utility model, the straight line where the first block of pulleys and the second block of pulleys is L1, the line of rotation of the first end of the first block of pulleys and the main mast is L2, and the angle between L1 and L2 is 90°.

In an embodiment of the present invention, the truss assembly further includes a plurality of intermediate connecting arms, one end of the intermediate connecting arm is connected to the first truss arm, and the other end of the intermediate connecting arm is connected to the second truss arm.

In an embodiment of the present invention, the cross sections of the first truss arm, the second truss arm and the intermediate connecting arm are in the shape of a ring, a square ring or a rectangle.

In an embodiment of the present invention, a counterweight mechanism is provided under the truss assembly.

In an embodiment of the present invention, the counterweight mechanism includes a counterweight base arranged below the truss assembly and a plurality of counterweights detachably arranged on the counterweight base.

In an embodiment of the present invention, the counterweight mechanism further includes a lifting member for adjusting the height of the counterweight base.

In an embodiment of the utility model, the lifting member is a telescopic oil cylinder.

The second aspect of the utility model provides a crane, which includes the above-mentioned luffing device for a crane.

It can be seen from the above technical solution that the luffing device includes a main mast, a pulley assembly, a steel wire rope and a truss assembly. The first pulley block is arranged at the end of the main mast away from the turntable, the truss assembly is arranged at the rear end of the turntable and extends backward, and the second pulley block is arranged At the rear end of the truss assembly, when the moment is constant, compared with the prior art, the above structural design increases the corresponding moment arm when the steel wire rope is stressed, thereby reducing the force of the steel wire rope, and there is no need to ensure that the luffing device Increase the use ratio and diameter of the steel wire rope or enhance the structural strength of the turntable to improve the reliability of use.

Description of drawings

The accompanying drawings are used to provide a further understanding of the embodiments of the utility model, and constitute a part of the description, and are used together with the following specific embodiments to explain the embodiments of the utility model, but do not constitute a limitation to the embodiments of the utility model. In the attached picture:

Fig. 1 is the luffing device in the utility model embodiment;

Fig. 2 is the luffing device in the prior art of the utility model.

Explanation of reference signs

1 Mainmast 2 Turntable

3 pulley assembly 301 first pulley block

302 2nd pulley block 4 wire rope

5 Truss assembly 501 First truss arm

502 Second lattice arm 503 Intermediate connecting arm

6 Counterweight mechanism 601 Counterweight base

602 Counterweight 603 Lifting piece

7 pin cylinder

Detailed ways

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

A new type of luffing device for cranes is provided in the embodiments of the present utility model. The luffing device in this embodiment is suitable for the non-super-lifting working conditions of the crane. As shown in Figure 1, the luffing device includes main Mast 1, pulley assembly 3, wire rope 4 and truss assembly 5, specifically, the first end of main mast 1 and the front end of the turntable 2 of the crane are rotatably connected, specifically, main mast 1 is arranged obliquely and its first end and turntable 2 The front end of the main mast 1 is hinged so that the main mast 1 can rotate relative to the turntable 2. Further, the main mast 1 in this embodiment can adopt an integral design or a split design; the pulley assembly 3 includes a first The pulley block 301 and the second pulley block 302, the steel wire rope 4 is wound on the first pulley block 301 and the second pulley block 302, and the luffing device in this embodiment also includes a main luffing mechanism (such as a hoisting machine) for winding the steel wire rope 4 structure), one end of the wire rope 4 is connected to the main luffing mechanism, and the other end of the wire rope 4 is connected to the main luffing mechanism after passing through the first pulley block 301 and the second pulley block 302, wherein the steel wire rope 4 passes through the first pulley block 301 and the second pulley block At 302, part of the wire rope 4 is wound on the first pulley block 301 and the second pulley block 302, and the main luffing mechanism is applied with force to pull the wire rope 4 to change the inclination angle of the main mast 1 (in this embodiment, the inclination angle of the main mast 1 When changing, the jib angle of the crane will also change accordingly). Under the condition of constant torque, the larger the corresponding moment arm when the steel wire rope 4 is stressed, the smaller the force on the steel wire rope 4 is. Further, in this embodiment, the corresponding moment arm length ΔL when the steel wire rope 4 is stressed is equal to the first The vertical distance between the straight line L4 where the first pulley block 301 and the second pulley block 302 are located (the angle between L4 and L2 in this embodiment is not 90°) and the rotation center of the first end of the main mast 1 . In the prior art (as shown in Figure 2, the straight line where the first pulley block 301 and the second pulley block 302 are located is L3, and the corresponding force arm length ΔL' when the steel wire rope 4 is stressed), the second pulley block 302 is directly installed on the turntable 2 , and in this embodiment, the truss assembly 5 is arranged at the rear end of the turntable 2 and extends backward, and the second pulley block 302 is arranged at the rear end of the truss assembly 5. In the case of a constant moment, compared with the prior art, this The above-mentioned design in the embodiment increases the corresponding moment arm when the steel wire rope 4 is under force, thereby reducing the force on the steel wire rope 4, and there is no need to additionally increase the use ratio and diameter of the steel wire rope 4 or strengthen the turntable in order to ensure the reliability of the luffing device. 2 structural strength.

In one embodiment of the present utility model, the truss assembly 5 includes a first truss arm 501 and a second truss arm 502 whose lengths can be adjusted, the front end of the first truss arm 501 is hinged to the rear side of the turntable 2, and the second truss arm The front ends of the first lattice arms 502 are spaced below the front ends of the first lattice arms 501 and are hinged to the rear side of the turntable 2. Specifically, the lattice assembly 5 includes a horizontally arranged first lattice arm 501 and an obliquely arranged second lattice arm 502. The front end of a lattice arm 501 is hinged to the rear side of the turntable 2. In this embodiment, the hinge between the front end of the first lattice arm 501 and the rear side of the turntable 2 is realized through the first pin shaft. There is a first spring latch for preventing it from falling off from the first lattice arm 501 and the turntable 2; In this embodiment, the hinge between the front end of the second lattice arm 502 and the rear side of the turntable 2 is realized through the second pin shaft. 2. The second spring pin that falls off on the top; the rear end of the first lattice arm 501 is connected to the rear end of the second lattice arm 502, and the second pulley block 302 is arranged on the rear ends of the first lattice arm 501 and the second lattice arm 502. The design not only enables the truss assembly 5 to meet its working performance, but also has the advantages of simple structure and convenient manufacturing, installation and disassembly;

Further, both the first lattice arm 501 and the second lattice arm 502 are telescopic arms, and by changing the telescopic lengths of the first lattice arm 501 and the second lattice arm 502, the position of the second pulley block 302 can be changed, thereby realizing the wire rope 4 The corresponding moment arm length changes when the force is applied, so as to adjust the second pulley block 302 to an optimal installation position according to actual working conditions. In this embodiment, the telescopic arm includes a first telescopic piece and a second telescopic piece. One end of the second telescopic piece extends into the interior of the first telescopic piece and can move axially relative to the first telescopic piece. By changing the second telescopic piece The axial movement length can realize the telescopic function of the telescopic arm.

In one embodiment of the present utility model, the cross sections of the first truss arm 501, the second truss arm 502 and the intermediate connecting arm 503 are in the shape of a ring, a square ring or a rectangle, that is, the first truss arm 501 in this embodiment And the second truss arm 502 and the intermediate connecting arm 503 can be round tubes, square tubes and long strips, which are simple in structure and easy to manufacture.

In one embodiment of the present utility model, the luffing device further includes a pin cylinder 7 (the pin cylinder 7 in this embodiment is an integrated pin cylinder 7), and the pin cylinder 7 is rotatably arranged on the first The rear ends of the lattice arm 501 and the second lattice arm 502 and the second pulley block 302 are arranged on the pin cylinder 7 .

In one embodiment of the present utility model, the straight line where the first pulley block 301 and the second pulley block 302 are located is L1, and the straight line where the first pulley block 301 and the rotation center of the first end of the main mast 1 is located is L2, between L1 and L2 The included angle between L1 and L2 is 90°. Specifically, when the included angle between L1 and L2 is 90°, the corresponding moment arm length reaches the maximum value when the steel wire rope 4 is stressed in this embodiment, and the maximum value is the main mast The length value of 1, in this case, the steel wire rope 4 bears the least force, which is beneficial to further improve the reliability of the luffing device.

In one embodiment of the present invention, the truss assembly 5 further includes a plurality of intermediate connecting arms 503 arranged obliquely, one end of the intermediate connecting arms 503 and the first truss arm 501 are detachably connected together by a pin shaft or a bolt assembly, and the middle The other end of the connecting arm 503 and the second truss arm 502 are detachably connected together by a pin or a bolt assembly. This structural design is conducive to enhancing the installation flexibility of the intermediate connecting arm 503 and the overall structural stability and stability of the truss assembly 5. Structural strength.

In one embodiment of the present utility model, a counterweight mechanism 6 is provided under the truss assembly 5 to improve the anti-overturning performance and overall stability of the crane, and to enhance the balance of the turntable 2 when performing slewing operations.

In one embodiment of the present invention, the counterweight mechanism 6 includes a counterweight base 601 arranged below the truss assembly 5 and a plurality of counterweights 602 detachably arranged on the counterweight base 601, so that the staff can It is necessary to increase or decrease the number of counterweights 602 used to meet the actual balance requirements of the crane, so that the crane can adapt to more working conditions and give full play to its lifting performance.

In one embodiment of the present invention, the counterweight mechanism 6 further includes a lifting member 603 for adjusting the height of the counterweight base 601 . Specifically, the upper end of the lifting member 603 is connected to the rear end of the truss assembly 5, and the counterweight mechanism 6 also includes a plurality of connecting chains, one end of the connecting chain is connected to the counterweight base 601, and the other end of the connecting chain is connected to the lower end of the lifting member 603. The height adjustment of the counterweight base 601 can be realized by changing the telescopic length of the lifting member 603, and the staff can adjust the counterweight base 601 to a suitable height according to actual needs, so that the crane can perform slewing and walking functions.

In one embodiment of the present invention, the lifting member 603 is a telescopic oil cylinder, which can meet the telescopic performance, and also has the advantages of simple structure, easy production and assembly, and low cost. Further, the lifting member 603 in this embodiment can also be replaced with other components with telescopic functions, such as telescopic cylinders, electric telescopic cylinders, etc. according to actual needs.

Another embodiment of the present utility model provides a new type of crane, which includes the luffing device of the above-mentioned embodiment for the crane, further, the crane includes but is not limited to a crawler crane, and the turntable 2 is installed on the crawler chassis .

The utility model provides a luffing device for a crane and a crane. The luffing device includes a main mast, a pulley assembly, a steel wire rope and a truss assembly. end and extend backward, the second pulley set is arranged at the rear end of the truss assembly. Under the condition of constant moment, compared with the prior art, the above structure design makes the corresponding force arm of the wire rope increase when the wire rope is stressed, thus making the wire rope The force is reduced, and there is no need to increase the use ratio and diameter of the wire rope or increase the structural strength of the turntable to ensure the reliability of the luffing device.

The preferred implementation of the present utility model has been described in detail above in conjunction with the accompanying drawings, however, the present utility model is not limited thereto. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solution of the present utility model, including the combination of each specific technical feature in any suitable manner. The combination method will not be explained separately. However, these simple modifications and combinations should also be regarded as the content disclosed by the utility model, and all belong to the protection scope of the utility model.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components , unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (10)

1. A luffing device for a crane, characterized in that, the luffing device comprises: a main mast (1), the first end of the main mast (1) is rotatably connected to the front end of the turntable (2) of the crane; a pulley assembly (3), comprising a first pulley block (301) and a second pulley block (302) arranged at the second end of the main mast (1); A steel wire rope (4), wound on the first pulley block (301) and the second pulley block (302); The truss assembly (5) is arranged at the rear end of the turntable (2) and extends backward, and the second pulley block (302) is arranged at the rear end of the truss assembly (5). 2. The luffing device for a crane according to claim 1, characterized in that, the truss assembly (5) comprises a first truss arm (501) and a second truss arm (502) whose length can be adjusted, The front end of the first lattice arm (501) is hinged to the rear side of the turntable (2), and the front end of the second lattice arm (502) is spaced below the front end of the first lattice arm (501) And hinged with the rear side of the turntable (2), the rear end of the first lattice arm (501) is connected to the rear end of the second lattice arm (502), and the second pulley block (302) is arranged on The rear ends of the first lattice arm (501) and the second lattice arm (502). 3. The luffing device for a crane according to claim 2, characterized in that, the straight line where the first pulley block (301) and the second pulley block (302) are located is L1, and the first pulley block ( 301) and the line where the center of rotation of the first end of the main mast (1) is located is L2, and the angle between the line L1 and the line L2 is 90°. 4. The luffing device for a crane according to claim 2, characterized in that, the truss assembly (5) further comprises a plurality of intermediate connecting arms (503), one end of the intermediate connecting arms (503) and The first lattice arm (501) is connected, and the other end of the intermediate connecting arm (503) is connected to the second lattice arm (502). 5. The luffing device for a crane according to claim 4, characterized in that, the first lattice arm (501), the second lattice arm (502) and the intermediate connecting arm (503) The section is circular, square circular or rectangular. 6. The luffing device for a crane according to any one of claims 1-5, characterized in that a counterweight mechanism (6) is arranged under the truss assembly (5). 7. The luffing device for a crane according to claim 6, characterized in that, the counterweight mechanism (6) comprises a counterweight base (601) arranged below the truss assembly (5) and a plurality of A counterweight (602) detachably arranged on the counterweight base (601). 8. The luffing device for a crane according to claim 7, characterized in that, the counterweight mechanism (6) further comprises a lifting member (603) for adjusting the height of the counterweight base (601 ) . 9. The luffing device for a crane according to claim 8, characterized in that, the lifting member (603) is a telescopic oil cylinder. 10. A crane, characterized in that the crane comprises the luffing device for a crane according to any one of claims 1-9.

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