CN101774513B

CN101774513B - Folding extension arm

Info

Publication number: CN101774513B
Application number: CN2010101130381A
Authority: CN
Inventors: 张扬; 刘雪梅; 白刚; 张世勇; 孙开胜
Original assignee: Kunshan Sany Machinery Co Ltd
Current assignee: Zhejiang Sany Equipment Co Ltd
Priority date: 2010-02-24
Filing date: 2010-02-24
Publication date: 2012-09-19
Anticipated expiration: 2030-02-24
Also published as: CN101774513A

Abstract

The invention discloses a folding extension arm, which comprises an upper arm, a lower arm and a pulling plate connecting the upper arm with the lower arm; and the pulling plate is connected with the upper arm and the lower arm through pin shafts. The folding extension arm can make up for the deficiency of manufacturing accuracy, and the whole weight of the extension arm is reduced; and in transportation, the folding extension arm is folded to descend the center of gravity so as to have the advantages of stable transportation, small transportation space and transportation cost conservation.

Description

Foldable lengthening arm

Technical Field

The invention relates to a lengthened arm of hoisting machinery, in particular to a foldable lengthened arm.

Background

The lengthened arm of the hoisting machinery is connected to the top end of the hoisting arm frame, so that the length of the hoisting arm frame can be increased, the operation amplitude is increased, and the hoisting machinery is very practical and convenient in light-load rapid operation. At present, the lengthened arm is generally made into an integral structure and is connected with other arm support units through a joint or an ear plate. The elongated arms of this overall construction impose severe dimensional requirements on the connecting portions, which can present significant manufacturing difficulties. The installation is inconvenient.

A crane boom comprises a crane boom support, a crane boom folding middle component and a crane boom top, which are mutually hinged with a lower arm of the crane boom at the same height. The intermediate member is connected to the boom support by a motorized mechanism that controls its rotation about an articulated axis. The top part of the jib is connected to the jib support by a coupling with three articulations, the central part of which is hinged to the fixing point of the intermediate member, so that the top part of the jib rotates about the hinge axis. However, the crane boom has a large structure and large overall weight, and is not stable enough in transportation and high in transportation cost.

A folding crane comprises an overbridge arranged on a support, a travelling crane capable of running along the overbridge, a hanger suspended under the travelling crane and a hoisting power, wherein a telescopic mechanism is arranged near the hinge joint of the support and the overbridge, the overbridge is at least divided into two sections, the two sections are hinged with each other, and locking mechanisms corresponding to each other are arranged near the hinge joint of the two sections. The folding crane has high requirement on manufacturing precision, large integral weight and less safety in transportation.

Disclosure of Invention

The invention aims to provide a foldable lengthened arm, which can make up for the deficiency of manufacturing precision and reduce the whole weight of the lengthened arm, and can be folded to lower the gravity center and stabilize the transportation, reduce the transportation space and save the transportation cost during the transportation.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a foldable lengthened arm comprises a forehead arm, a forehead arm and a pulling plate for connecting the forehead arm and the forehead arm; the pulling plate is connected with the forehead arm and the forehead arm through a pin shaft.

In the foldable lengthened arm, one end of the pulling plate is provided with the first connecting hole, and the other end of the pulling plate is provided with the second connecting hole.

In the foldable lengthened arm, one end of the forehead arm is provided with an upper connecting hole, and the other end of the forehead arm is provided with an upper mounting hole; a first pin shaft is arranged on the upper connecting hole, and the first connecting hole and the upper connecting hole are coaxial. The upper mounting hole of the upper forehead arm is connected with an upper hinge point of an arm section of the hoisting machinery.

In the foldable lengthened arm, the first pin is connected with the first connecting hole and the upper connecting hole so as to fixedly connect the forehead arm and the pulling plate.

In the foldable lengthened arm, one end of the lower forehead arm is provided with a lower connecting hole, and the other end of the lower forehead arm is provided with a lower mounting hole; a second pin shaft is arranged on the lower connecting hole, and the second connecting hole is coaxial with the lower connecting hole; and the lower mounting hole of the lower forehead arm is connected with a lower hinge point of an arm joint of the hoisting machinery.

In the foldable lengthened arm, the second pin shaft is connected with the second connecting hole and the lower connecting hole so as to connect the lower arm and the pulling plate.

In the foldable lengthened arm, the lower arm rotates by taking the second pin shaft as a rotating point; the pulling plate rotates by taking the second pin shaft as a rotating point.

A method of mounting a foldable elongated arm, comprising the steps of:

step 1, lifting a forehead arm by using a lifting hook, rotating the forehead arm around a pin shaft on a pulling plate, and lifting the forehead arm until the forehead arm is mounted on an upper hinge point on an arm joint of a hoisting machine;

and 2, lifting the forehead arm by using a lifting hook, rotating the forehead arm around a pin shaft at the pull plate, and connecting the forehead arm with an arm joint of the lifting machine at a lower hinge point.

Due to the adoption of the technology, compared with the prior art, the invention has the following positive effects:

1. the foldable lengthened arm can solve the problem that the lengthened arm is difficult to manufacture and install due to the fact that the connection size between the hinge points is adjustable.

2. When the connecting points of the foldable elongated arm and other arm sections are positioned on different structural members, the adjustability of the connecting size of the foldable elongated arm can make up for the deficiency of manufacturing precision.

3. The foldable lengthened arm can greatly reduce the whole weight of the lengthened arm because the upper arm and the lower arm are connected through the pulling plate,

4. the foldable lengthened arm is folded during transportation, the center of gravity is lowered, and transportation is stable; meanwhile, the folded foldable lengthened arm can greatly reduce the transportation space and save the transportation cost.

Drawings

Fig. 1 is a perspective view of the general assembly of the foldable elongated arm of the present invention.

Fig. 2 is an overall assembly front view of the collapsible elongated arm of the present invention.

Fig. 3 is a schematic view of the installation of the forehead arm of the foldable extension arm of the invention.

Fig. 4 is a schematic view of the installation of the novel foldable lengthened arm for the lower arm.

Fig. 5 is a folding schematic view of the foldable elongated arm of the present invention.

Detailed Description

The embodiments of the present invention are further described below with reference to the drawings.

Referring to fig. 1 and 2, a foldable lengthened arm comprises a forehead arm 1, a forehead arm 2 and a pulling plate 3 connecting the forehead arm 1 and the forehead arm 2; the pulling plate 3 is connected with the forehead arm 1 and the forehead arm 2 through a pin shaft 4. One end of the forehead arm 1 is provided with an upper connecting hole 11, and the other end of the forehead arm is provided with an upper mounting hole 12 for mounting the forehead arm on the crane arm section 5. One end of the lower forehead arm 2 is provided with a lower connecting hole 21, and the other end is provided with a lower mounting hole 22 for mounting the upper forehead arm on the crane arm section 5. One end of the pulling plate 3 is provided with a first connecting hole 31 for connecting the pulling plate 3 and the forehead arm 1, and the other end is provided with a second connecting hole 32 for connecting the pulling plate 3 and the forehead arm 2. The pin 4 includes a first pin 41 and a second pin 42. The first pin shaft 41 is connected with the first connecting hole 31 and the upper connecting hole 11, so that the forehead arm 1 and the pulling plate 2 are fixedly connected; the second pin shaft 42 passes through the second connecting hole 32 and the lower connecting hole 21 to connect the lower forehead arm 2 and the pulling plate 3. The pulling plate 3, the second pin shaft and the lower arm 2 rotate by taking the second pin shaft 42 as a rotating point. The forehead arm 1 rotates along with the rotation of the pulling plate 3, namely, the forehead arm 1 also rotates by taking the pin shaft 42 as a rotating point.

A method of mounting a foldable elongated arm, comprising the steps of:

referring to fig. 3, in step 1, when the foldable lengthened arm is installed, the forehead arm 1 is lifted by the hook 6, the forehead arm 1 rotates around the second pin 42 at the pulling plate 3, the forehead arm 1 is lifted until the forehead arm is installed on the upper hinge point 51 on the arm section 5 of the hoisting machine, and in the process, the forehead arm 2 still lies on the ground.

Referring to fig. 4, after the step 2 and the step 1 are completed, that is, after the forehead arm 1 is installed, the forehead arm 2 is lifted by the hook 6, and the forehead arm 2 rotates around the second pin 42 at the pulling plate 3. The lower arm 2 is connected to the arm section 5 of the lifting machine at the lower pivot point 52.

As can be seen from the whole installation process, when the distances between the upper hinge point 51 and the lower hinge point 52 on the arm section 5 of the hoisting machinery are deviated, the foldable lengthened arm can be conveniently installed.

As shown in fig. 5, during transportation, the foldable lengthened arm is folded, the lower forehead arm 2 is placed on a plane, the upper forehead arm 1 rotates around the second pin 42 and is overlapped with the lower forehead arm 2 as much as possible, so that the integral gravity center of the foldable lengthened arm is lowered, and transportation is stable; meanwhile, the folded foldable lengthened arm can greatly reduce the transportation space and save the transportation cost.

The foldable lengthened arm can make up for the deficiency of manufacturing precision, reduce the overall weight of the lengthened arm, and during transportation, the foldable lengthened arm is folded to lower the gravity center, stabilize the transportation, reduce the transportation space and save the transportation cost.

Claims

1. A folded cascade extension arm which characterized in that: comprises a forehead arm (1), a forehead arm (2) and a pulling plate (3) connecting the forehead arm (1) and the forehead arm (2); the pulling plate (3) is connected with the forehead arm (1) and the forehead arm (2) through a pin shaft (4);

one end of the forehead arm (1) is provided with an upper connecting hole (11), and the other end is provided with an upper mounting hole (12);

one end of the lower forehead arm (2) is provided with a lower connecting hole (21), and the other end is provided with a lower mounting hole (22);

one end of the pulling plate (3) is provided with a first connecting hole (31), and the other end is provided with a second connecting hole (32);

the pin shaft (4) comprises a first pin shaft (41) and a second pin shaft (42); wherein,

the first pin shaft (41) is connected with the first connecting hole (31) and the upper connecting hole (11) so as to fixedly connect the forehead arm (1) and the pulling plate (3), and the first connecting hole (31) is coaxial with the upper connecting hole (11);

the second pin shaft (42) is connected with the second connecting hole (32) and the lower connecting hole (21) so as to connect the lower arm (2) and the pulling plate (3), the second connecting hole (32) and the lower connecting hole (21) are coaxial, and the pulling plate (3) and the lower arm (2) rotate by taking the second pin shaft (42) as a rotating point.

2. Foldable elongated arm according to claim 1, characterized in that:

the upper mounting hole (12) of the upper forehead arm (1) is connected with an upper hinge point (51) of an arm joint (5) of the hoisting machinery.

3. Foldable elongated arm according to claim 1, characterized in that:

the lower mounting hole (22) of the lower forehead arm (2) is connected with a lower hinge point (52) of an arm joint (5) of the hoisting machinery.

4. A method for installing a foldable lengthened arm is characterized in that: the method comprises the following steps:

step 1, lifting a forehead arm (1) by using a lifting hook (6), rotating the forehead arm (1) around a second pin shaft (42) at a pulling plate (3), and lifting the forehead arm (1) until the forehead arm is mounted on an upper hinge point (51) on an arm joint (5) of a hoisting machine;

and 2, lifting the forehead arm (2) by using the lifting hook (6), rotating the forehead arm (2) around a second pin shaft (42) at the pull plate (3), and connecting the forehead arm (2) with an arm joint (5) of the lifting machine at a lower hinge point (52).