JPH0717683A - Lifting device of strut for climbing crane - Google Patents

Abstract

PURPOSE:To provide a lifting device of a strut for a climbing crane with no apprehension of buckling even when used a long and narrow hydraulic cylinder. CONSTITUTION:In a lifting device of a strut for a climbing crane, a strut 3 erected in the center of a hollow frame is lifted by a lifting frame 7, and a new unit pillar 3a is connected to the lower part successively one after another. An upper part of a hoisting hydraulic cylinder is pivotally mounted on the hollow frame, and a lower end of a piston rod 5 of this hoisting hydraulic cylinder is pivotally mounted on the lifting frame 7 through a link plate 6. In the link plate 6, a slot for inserting a pivot pin is provided, and when the lifted strut 3 is lowered down onto the lower unit pillar 3a, the link plate 6 is relatively lowered down against the lifting frame 7 in a range of the slot, to prevent the hydraulic cylinder 4 from its buckling. In a limit switch, when the strut 3 is placed on the unit pillar 3a, a relative vertical motion, generated between the link plate 6 and the lifting frame 7, is detected to stop extending action of the hydraulic cylinder 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for raising a pillar of a climbing crane used, for example, in a construction work of a transmission line tower, as the tower is assembled.

[0002]

2. Description of the Related Art Conventionally, a device for climbing crane climbing, in which a column for a climbing crane standing in the center of a hollow pedestal is lifted using an elevating frame and a new unit column is connected to the lower part to raise the column one after another. Is known (for example, Japanese Patent Laid-Open No. 4-203079).

[0003]

In the conventional lifting device described above, a structure is adopted in which the support rod is lifted by extending the piston rod of the hydraulic cylinder upward. In this lifting device, an elongated hydraulic cylinder is used in order to obtain a relatively large lifting stroke.

In the above-mentioned conventional lifting device, since the hydraulic cylinder is elongated and used in the pushing-up direction, there is a problem that it is susceptible to buckling stress and is easily damaged. Therefore, it is an object of the present invention to provide a lifting device for a climbing crane column that does not cause buckling even if an elongated hydraulic cylinder is used.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a climbing crane column 3 standing in the center of a hollow frame 1 is lifted by using an elevating frame 7.
In a lifting device for climbing crane columns, which is connected to a new unit column 3a at the bottom, and is raised one after another, an upper part of a hydraulic cylinder 4 for lifting is pivotally attached to a hollow pedestal 1 and downward from the hydraulic cylinder 4. The lower end of the piston rod 5 protruding toward the
The lifting frame 7 is pivotally attached by a pivot pin 9, and the link plate 6 is provided with a vertically elongated hole 6a through which the pivot pin 9 penetrates.
When lowering the lifted column 3 onto the unit column 3a arranged below, the link plate 6 is lowered relative to the elevating frame 7 in the range of the long hole 6a to prevent the hydraulic cylinder 4 from buckling. I chose

A limit switch 11 is interposed between the link plate 6 and the elevating frame 7 so that when the support column 3 is placed on the unit column 3a, it is located between the link plate 6 and the elevating frame 7. By detecting the relative vertical movement that occurs, the extension operation of the hydraulic cylinder 4 is stopped.

[0007]

In the present invention, the elevating frame 7 is connected to the climbing crane column 3 standing in the center of the hollow pedestal 1 using a pin or the like, and the piston rod 5 of the hydraulic cylinder 4 is pulled up to lift the elevating frame 7. Both lift the column 3. Since the hydraulic cylinder 4 is used in the pulling direction, there is no risk of buckling. After arranging a new unit pillar 3a below the lifted pillar 3, the piston rod 5 of the hydraulic cylinder 4 is extended by a predetermined length, and the pillar 3 is lowered onto the unit pillar 3a to connect them. By repeating this operation, the columns 3 are raised one after another. When lowering the support pillar 3 onto the unit pillar 3a, if the piston rod 5 still slightly expands even when the pillar 3 is placed on the unit pillar 3a, the link plate 6 is lifted and lowered in the range of the long hole 6a. Relative to the hydraulic cylinder 4 to prevent buckling of the hydraulic cylinder 4.

Further, when the limit switch 11 is interposed between the link plate 6 and the elevating frame 7, the column 3
The limit switch 11 detects the relative vertical movement between the link plate 6 and the elevating frame 7 and stops the extension operation of the hydraulic cylinder 4 when the unit is mounted on the pillar of the unit 3a.

[0009]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a connecting portion between an elevating frame and a piston rod in a lifting device for a climbing crane.
2 is a side view of the same, and FIG. 3 is an overall configuration diagram of a lifting device for a climbing crane column.

In FIG. 3, the hollow pedestal 1 is fixed on the floor surface 2. A column 3 for a climbing crane is erected in the central space of the hollow frame 1. A power line tower and the like (not shown) are assembled around the pillar 3. The column 3 is configured by connecting a number of unit columns 3a. As the assembly of the steel tower and the like progresses, new unit columns 3a are connected to the lower part of the column 3 one after another, and the column 3 is raised.

An upper part of a hydraulic cylinder 4 for pulling up a column is pivotally mounted on an upper part of the hollow frame 1. The lower end of the piston rod 5 protruding downward from the hydraulic cylinder 4 is
It is pivotally attached to the elevating frame 7 via the link plate 6.

The elevating frame 7 is in the shape of a substantially rectangular frame and surrounds the column 3, and can be attached to and detached from the column 3 by inserting and removing a pin (not shown). The elevating frame 7 has guide wheels 7 a that engage with the hollow pedestal 1 at its four corners, and moves up and down inside the hollow pedestal 1.

As shown in FIGS. 1 and 2, the link plate 6 has a pin 8 on the eye of the piston rod 5 at the upper portion.
And has a vertically elongated hole 6a through which the pivot pin 9 penetrates. The long hole 6a is made to correspond to the hole 10a of the lug 10 projecting from the elevating frame 7, and the pivot pin 9 is passed through this to connect the link plate 6 and the elevating frame 7.

A limit switch 11 is attached to the elevating frame 7, and its lever is arranged so as to be pushed down by the link plate 6. When the lever of the limit switch 11 is pushed down to the link plate 6, the extension operation of the piston rod 5 is stopped.

In this embodiment, when the climbing crane support column 3 is raised, the climbing crane support column 3 standing at the center of the hollow mount 1 is connected to the elevating frame 7 using pins or the like, and the hydraulic cylinder 4 is used. Then, the piston rod 5 is pulled up, and the support frame 3 together with the lifting frame 7 are raised. Since the hydraulic cylinder 4 is used in the pulling direction, there is no risk of buckling. Below the raised column 3,
After arranging a new unit pillar 3a, the piston rod 5 of the hydraulic cylinder 4 is extended to move the pillar 3 to the unit pillar 3a.
Place them on top and connect them with pins. By repeating this operation, the columns 3 are raised one after another. When lowering the pillar 3 onto the unit pillar 3a, the pillar 3 is moved to the unit pillar 3a.
The piston rod 5 still slightly expands even when the piston rod 5 is placed on a. At this time, the link plate 6 descends relative to the elevating frame 7 within the range of the elongated hole 6a, and prevents the hydraulic cylinder from buckling.

When the link plate 6 is relatively lowered, the lever of the limit switch 11 is pushed down by the link plate 6, the hydraulic pressure of the hydraulic cylinder 4 is controlled by the operation of the limit switch 11, and the extension operation of the piston rod 5 is stopped.

[0017]

As described above, in the present invention, the climbing crane support column 3 standing in the center of the hollow mount 1 is
Lift using the lifting frame 7 and add a new unit pillar 3 at the bottom.
In a lifting device for climbing cranes which is connected to a and is raised one after another, an upper part of a hydraulic cylinder 4 for lifting is pivotally attached to a hollow pedestal 1, and a piston rod 5 protruding downward from the hydraulic cylinder 4 is connected. The lower end of
The link plate 6 is pivotally attached to the elevating frame 7 by a pivot pin 9, and the link plate 6 is provided with a vertically elongated hole 6a through which the pivot pin 9 penetrates. Since the link plate 6 is lowered relative to the elevating frame 7 in the range of the long hole 6a when the unit cylinder 3a is arranged, and the buckling of the hydraulic cylinder 4 is prevented, an elongated hydraulic cylinder is used. Even if there is no fear of buckling, it is possible to provide a lifting device for a climbing crane column.

Further, a limit switch 11 is interposed between the link plate 6 and the elevating frame 7, so that when the support column 3 is placed on the unit column 3a, it is interposed between the link plate 6 and the elevating frame 7. Since the extension movement of the hydraulic cylinder 4 is stopped by sensing the relative vertical movement that occurs, the hydraulic cylinder 4 can be controlled by more accurately sensing the timing of joining the support column 3 and the unit column 3a. result,
Buckling of the hydraulic cylinder 4 can be prevented.

[Brief description of drawings]

FIG. 1 is a front view of a connecting portion between an elevating frame and a piston rod in a lifting device for a climbing crane column.

FIG. 2 is a side view of a connecting portion between an elevating frame and a piston rod in a climbing crane column lifting device.

FIG. 3 is an overall configuration diagram of a lifting device for a climbing crane.

[Explanation of symbols]

 1 Hollow stand 2 Floor 3 Strut 3a Unit post 4 Hydraulic cylinder 5 Piston rod 6 Link plate 6a Long hole 7 Lifting frame 8 Pin 9 Pivot pin 10 Lug 11 Limit switch

Claims (2)

[Claims] 1. A climbing crane support device for lifting a support for a climbing crane standing in the center of a hollow mount using a lifting frame and connecting a new unit support to the lower part of the support device for climbing cranes. The upper part of the hydraulic cylinder for pulling up is pivotally attached to the hollow mount, and the lower end of the piston rod protruding downward from this hydraulic cylinder is
The link frame is pivotally attached to the elevating frame with a pivot pin, and the link plate is provided with a vertically elongated hole through which the pivot pin penetrates. A lifting device for a climbing crane, wherein the link plate lowers relative to the elevating frame within the range of the long hole when the hydraulic cylinder is buckled to prevent buckling of the hydraulic cylinder. 2. A relative up-and-down generated between the link plate and the elevating frame when a limit switch is interposed between the link plate and the elevating frame and the column is placed on the unit column. The lifting device for a prop for a climbing crane according to claim 1, wherein the extension operation of the hydraulic cylinder is stopped by detecting a motion.