CN111960297A

CN111960297A - Liftable mast device of tower crane

Info

Publication number: CN111960297A
Application number: CN202010849075.2A
Authority: CN
Inventors: 刘志禹; 赵欣; 王明鑫; 才冰; 史勇
Original assignee: Fushun Yongmao Construction Machinery Co ltd
Current assignee: Fushun Yongmao Construction Machinery Co ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2020-11-20

Abstract

The invention discloses a liftable mast device of a tower crane, which comprises a liftable mast, wherein the lower end of the liftable mast is connected to a tower head of the tower crane, the upper end of the liftable mast is respectively connected with the inner ends of a front stay cable and a rear stay cable, and the outer ends of the front stay cable and the rear stay cable are respectively connected to a cargo boom and a balance arm of the tower crane. By adopting the structure, when the liftable mast is in a recovery state, the tower crane is a flat-head tower crane; when the liftable mast is in a jacking state, the front pulling rope and the rear pulling rope are tightened to pull up the cargo boom and the balance arm, and the tower crane is a tower head type tower crane. The invention can quickly switch the tower crane between the flat head type and the tower head type, and change the stress state of the crane boom of the tower crane. The tower crane has the advantages of simple structure, convenience in mounting and dismounting and suitability for tower grouping operation, and can be quickly switched into the tower crane, so that the hoisting performance is improved, and the heavy load far beyond the rated load of the flat-head tower crane is hoisted.

Description

Liftable mast device of tower crane

Technical Field

The invention belongs to the technical field of tower crane accessories, and relates to a liftable mast device of a tower crane.

Background

Tower cranes are called tower cranes for short and include many types such as flat heads, tower heads and swing arms. At present, a flat-head type tower crane is widely applied to various engineering constructions, is favored due to the simple structural style of a crane boom, convenient installation and disassembly and suitability for tower group operation, but has great restriction on the hoisting capacity due to the cantilever structural style. The tower head type tower crane is provided with a tower cap, a front pull rope, a rear pull rope and other structures, and the bearing capacity of the structural form is greatly superior to that of a cantilever type structure of a flat head type tower crane on the premise that the strength of a cantilever frame is equivalent. At present, a device which can enable a tower crane to be rapidly switched between a flat head type and a tower head type and change the stress state of a crane boom of the tower crane does not exist, and actual requirements are difficult to meet.

Disclosure of Invention

The invention aims to provide a lifting mast device of a tower crane, which has a simple structure and a skillful design, can quickly switch a tower crane between a flat head type and a tower head type and change the stress state of a crane boom of the tower crane.

The technical scheme adopted by the invention is as follows: the device comprises a liftable mast, and is characterized in that: the lower end of the liftable mast is connected to the tower head of the tower crane, the upper end of the liftable mast is respectively connected with the inner ends of the front and rear stay ropes, and the outer ends of the front and rear stay ropes are respectively connected to the cargo boom and the balance arm of the tower crane.

By adopting the structure, when the liftable mast is in a recovery state, the tower crane is a flat-head tower crane; when the liftable mast is in a jacking state, the front pulling rope and the rear pulling rope are tightened to pull up the cargo boom and the balance arm, and the tower crane is a tower head type tower crane. The invention can quickly switch the tower crane between the flat head type and the tower head type, and change the stress state of the crane boom of the tower crane. The tower crane has the advantages of simple structure, convenience in mounting and dismounting and suitability for tower grouping operation, and can be quickly switched into the tower crane, so that the hoisting performance is improved, and the heavy load far beyond the rated load of the flat-head tower crane is hoisted. Therefore, the tower crane can replace other cranes to carry out heavy-load hoisting to a certain extent, reduce the occupation of a construction site and maximize the benefit of a tower crane user.

Drawings

FIG. 1 is a schematic view of the recovery state of the present invention;

fig. 2 is a schematic structural view of the jacking state of the present invention.

Detailed Description

As shown, the present invention includes a liftable mast 1. The lower end of the liftable mast 1 is connected to a tower head 6 of the tower crane, the upper end of the liftable mast is respectively connected with the inner ends of the front pull rope 8 and the rear pull rope 9, and the outer ends of the front pull rope 8 and the rear pull rope 9 are respectively connected to the front part of a cargo boom 12 and the rear part of a balance arm 13 of the tower crane through a pin shaft I10 and a pin shaft II 11.

The lifting mast 1 comprises two telescopic loop bars 2 which are arranged in an inverted V shape, and each telescopic loop bar 2 consists of an inner bar 2-2 and an outer bar 2-1 which are sleeved together; the lower ends of the two telescopic loop bars 2 are respectively hinged on a tower head 6 through a pin shaft 4, and the upper ends are fixed on the top end 3 of the mast; the upper end of the top end 3 of the mast is respectively connected with the inner ends of a front guy cable 8 and a rear guy cable 9, and the lower end of the top end is connected with the front end of a piston rod of a jacking oil cylinder 7 positioned in a tower head 6; the inner and outer rods 2-2 and 2-1 of the telescopic loop bar 2 are provided with positioning holes 5.

The jacking oil cylinder 7 is powered by a hydraulic pump station, and the jacking oil cylinder 7 is controlled by a controller to extend out or retract a piston rod.

The working process of the invention is as follows:

1. the jacking oil cylinder 7 is controlled to extend out of a piston rod, the inner rods 2-2 of the two telescopic loop bars 2 are pulled to extend out simultaneously, the liftable mast 1 is in a jacking state, after the inner rods 2-2 of the telescopic loop bars 2 extend out to a certain length, the pin shafts are installed in the positioning holes 5 to be fixed, the telescopic loop bars 2 are kept at a fixed length and cannot retract after being pressed, a certain angle is formed between the fixed length and the crane arm 12, the tower crane is in a tower head type tower crane type at the moment, and the front pull rope 8 and the rear pull rope 9 are in a tensioning state. At the moment, a lifting arm 12 of the tower crane is converted into a beam rod with a pressed axis by a cantilever beam, the stress state is improved, and the lifting capacity of the tower crane is greatly improved;

2. and (3) removing a pin shaft in the positioning hole 5, controlling the jacking oil cylinder 7 to withdraw the piston rod, pulling the inner rods 2-2 of the two telescopic loop bars 2 to retract simultaneously, and enabling the liftable mast 1 to be in a recovery state, wherein the tower crane is in a flat-head tower crane type at the moment, and the front pull rope 8 and the rear pull rope 9 are in a loose state.

Claims

1. A liftable mast device of a tower crane comprises a liftable mast (1), and is characterized in that: the lower end of the liftable mast (1) is connected to a tower head (6) of the tower crane, the upper end of the liftable mast is respectively connected with the inner ends of the front guy cable and the rear guy cable (8 and 9), and the outer ends of the front guy cable and the rear guy cable (8 and 9) are respectively connected to a cargo boom (12) and a balance arm (13) of the tower crane.

2. The liftable mast apparatus of a tower crane according to claim 1, wherein: the lifting mast (1) comprises two telescopic loop bars (2) which are arranged in an inverted V shape, and each telescopic loop bar (2) consists of an inner bar (2-2) and an outer bar (2-1) which are sleeved together; the lower ends of the two telescopic loop bars (2) are respectively hinged on a tower head (6) through a pin shaft (4), and the upper ends are fixed on the top end (3) of the mast; the upper end of the top end (3) of the mast is respectively connected with the inner ends of the front and rear guy cables (8, 9), and the lower end is connected with the front end of a piston rod of a jacking oil cylinder (7) positioned in the tower head (6); the inner and outer rods (2-2, 2-1) of the telescopic loop bar (2) are provided with positioning holes (5).

3. A liftable mast apparatus of a tower crane according to claim 1 or 2, wherein: the outer ends of the front and rear inhaul cables (8, 9) are respectively connected with the front part of a crane boom (12) and the rear part of a balance arm (13) of the tower crane through a pin shaft I (10) and a pin shaft II (11).