JP2001151472A - Hook storing device for mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook storing device for crane without hindering a driving visual field at the time of traveling by a main hook storing fitting and a main hook at a storing position. SOLUTION: Space capable of storing a main winding hook storing arm and a main winding hook in pulling up states is provided between a boom head and a top boom tip part made in a connected state by an upper connecting pin and a lower connecting pin. By tilting and storing the boom head to a top boom tip part side by a tilt device after the main winding hook is pulled up by the main winding hook storing arm by winding of main wire at an attitude that the boom head is tilted and extended to the front by the tilt device, the main winding hook storing arm and the main winding hook in the pulling up states are stored in space between the boom head and a top boom tip part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main hoist hook storing device for winding and storing a main hoist hook during traveling in a mobile crane such as a rough terrain crane or an alterane crane.

[0002]

2. Description of the Related Art Conventionally, as a hook storage device used for a mobile crane, there is known a technology described in Japanese Utility Model Application No. Hei 5-4546, "Main hook storage device of wheel type crane". That is, the main hook storage bracket is attached to the boom tip by its own weight, centering on the horizontal horizontal axis that is shifted forward from the main hook hoisting force line (the line passing through the center of each sheave pin of the boom tip lower sheave and hook sheave). The storage hook is attached rotatably between the crane working position hanging down from the boom head and the storage position along the lower surface of the boom head. Together with the boom and retracted on the lower side of the boom. The main hook storage metal is provided with a bottom plate, and when the main hook is unwound, the upper surface of the main hook abuts against the contact surface, which is the lower surface of the bottom plate. It is configured to be applied as a push-up rotation power.

[0003]

However, according to the conventional main hook storage device, the storage position where the upper surface of the main hook is integrally rotated from the state in which the upper surface of the main hook is in close contact with the contact surface of the main hook storage metal is the boom. It was restricted to the lower surface. That is, the integrated main hook storage fitting and main hook have to be stored near the bottom surface of the boom.

Depending on the type of the mobile crane, the driving visibility during traveling may be obstructed by the main hook storage metal fitting and the main hook at the above storage position, and improvement has been demanded.

Accordingly, the present invention is directed to Japanese Patent Application No. 7-24051.
As described in Japanese Patent Publication No. 3 “Boom head attachment / detachment device”, attention has been paid to the fact that a mobile crane capable of attaching / detaching a boom head to a tip end of a boom has been put into practical use in recent years. It is an object of the present invention to provide a solution for a mobile crane hook storage device.

[0006]

According to the first aspect of the present invention, an upper connecting pin and a lower connecting pin which can be inserted and removed at two positions vertically separated from a top boom tip of a telescopic boom mounted on a vehicle. The main boom head has a sheave of a main winding wire at a lower part thereof, and a boom head having a main winding hook suspended below the sheave, and the boom head is located at an upper part with respect to a top boom tip. With the connecting pin pivoted and the lower connecting pin removed, the boom head is tilt-driven forward to the boom centering on the pivoted portion by the upper connecting pin, between the boom head and the top boom tip. An interposed tilt device,
The boom head is pivotally supported by a swing shaft provided at a lower front portion thereof, and has a contact surface with which a main winding hook abuts at a lower end thereof, and a main winding wire is wound up to correspond to the main winding hook. The main winding hook storage arm which is brought into contact with the contact surface, and further turned up around the swing shaft together with the main winding hook by further winding of the main winding wire and pulled up to the top boom mounting side of the boom head. A hook storage device for a mobile crane, comprising: a main winding hook storage arm in a raised state; and a main storage hook arm in a raised state between the boom head and a top boom tip connected by the upper connection pin and the lower connection pin. A space for accommodating a winding hook is provided, and a main winding hook is provided by the main winding hook storage arm by winding a main winding wire in a posture in which the boom head is tilted forward by the tilt device. After being raised, the tilt device retracts the boom head toward the top boom tip so that the main winding hook storage arm and the main winding hook in the raised state are located between the boom head and the top boom tip. It is configured to be stored in.

[0007] With this configuration, the integrated main winding hook storage arm and the main winding hook can be set to the storage position at a position where the main winding hook is further raised above the lower surface of the boom.

[0008]

FIG. 1 shows a hook storage device of a mobile crane according to an embodiment of the present invention.

Numeral 7 denotes a telescopic boom 1 mounted on a vehicle (not shown).
It is a boom head that can be detachably attached by an upper connecting pin 3 and a lower connecting pin 4 which can be inserted and removed at different positions. The lower part of the boom head 7 has a main winding wire sheave 5, and a main winding hook 6 is suspended by the main winding wire 8 below the main winding wire sheave 5.

Reference numeral 9 denotes a tilt device interposed between the boom head 7 and the top boom tip 2, wherein the boom head 7 is connected to the top boom tip 2 by an upper connecting pin 3.
When the lower connecting pin 4 is detached, the boom head 7 is driven to tilt the lower side of the boom head toward the front of the boom centering on the pivoted portion by the upper connecting pin 3. In the present embodiment, an example in which the tilt device 9 uses a hydraulic cylinder is shown. The tilt device 9 is disposed below the upper connecting pin 3, and both ends thereof are pivotally connected to the boom head 7 and the top boom tip 2 by pins 10 and 11. Is being worn. The tilt device 9 can be operated in the cab,
The main winding winch (not shown) is wound up to operate the main winding hook 6.
, The tilt operation of the boom head 7 can be simultaneously performed by the tilt device 9.

A main winding hook storage arm 14 is pivotally supported by a rocking shaft 12 provided on a lower front portion 16 of the boom head and has a contact surface 13 with which the main winding hook 6 abuts at its lower end. It is. The main winding hook storage arm 14 winds up the main winding wire 8, makes the main winding hook 6 abut on the contact surface 13, and then further winds up the main winding wire 8, so that the main winding hook 6 is wound.
The boom head 7 is pivoted about the swing shaft 12 and is pulled up to the top boom mounting side of the boom head 7.

Reference numeral 15 denotes a main winding hook storing arm 14 and a main winding hook 6 which are pulled up between the boom head 7 and the top boom tip 2 connected by the upper connecting pin 3 and the lower connecting pin 4. It is a space that can be stored.

The operation of the hook storage device configured as described above when the hook is stored will be described below with reference to FIGS.

FIG. 2 shows a state in which the boom head 7 is pivotally connected to the top boom tip 2 with the upper connecting pin 3 and the lower connecting pin 4 is removed from the state shown in FIG. Reference numeral 9 denotes a posture in which the lower side of the boom head is tilt-driven toward the front side of the boom about the pivotal connection portion by the upper connecting pin 3. Further, by winding up the main winding wire 8, the main winding hook 6 is brought into contact with the contact surface 13 at the lower end of the main winding hook storage arm 14.

FIG. 3 shows the main winding wire 8 from the state shown in FIG.
The main winding hook 6 and the main winding hook storage arm 14 are turned around the swing shaft 12 provided on the lower front portion 16 of the boom head, thereby turning the boom head 7.
5 shows a state in which it is pulled up to the top boom mounting side. The boom head 7 is provided with a stopper (not shown), and is brought into contact with the main winding hook storage arm 14 so that the main winding hook storage arm 14
Is controlled at a predetermined position.

FIG. 4 shows that the main winding hook storage arm 14 and the main winding hook 6 in the raised state are retracted from the state shown in FIG. 3 by tilting the boom head 7 toward the tip end of the top boom by the tilting device 9. This figure shows a state where it is stored in the space between the boom head 7 and the top boom tip 2.

As described above, the main winding hook 6 shown in FIG.
In the retracted position, most of the main winding hook 6 is stored above the lower surface 17 of the telescopic boom 1, so that even when the mobile crane travels, its front view is not obstructed.

In order to set the main winding hook 6 in the main winding hook storage position to the working position shown in FIG. 1, the above procedure may be reversed.

In the above-described embodiment, an example of a tilt device using a hydraulic cylinder has been described. However, as another method, one end of an auxiliary winding wire is connected to an appropriate position of a boom head, and the auxiliary winding wire is wound by a winch. The boom head may be tilt-driven by raising it.

[0020]

As described above, the mobile crane hook storage device of the present invention raises the integrated main winding hook storage arm and main winding hook further above the lower surface of the boom. It is possible to store at the position where it was set. As a result, most of the main winding hooks are stored above the lower surface of the telescopic boom, so that even when traveling on the mobile crane, the visibility is not obstructed, and a good forward visibility is obtained. You can do it.

Further, since all the operations of storing and removing the main hook can be operated in the cab, the time for storing and removing the hook can be shortened, and the burden of the operator on the work can be reduced. is there.

[Brief description of the drawings]

FIG. 1 is a side view of a hook storage device of a mobile crane according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a state in which a boom head is tilted forward and a main winding hook is in contact with a main winding hook storage arm.

3 is a diagram showing a state where the main winding hook storage arm and the main winding hook are further pulled up integrally from the state of FIG. 2;

FIG. 4 is a final storage state diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telescopic boom 2 Top boom tip part 3 Upper connecting pin 4 Lower connecting pin 5 Main winding wire sheave under boom head 6 Main winding hook 7 Boom head 8 Main winding wire 9 Tilt device 12 Oscillating shaft 13 Contact surface 14 Main winding hook Storage arm 15 space

Claims (1)

[Claims] 1. A telescopic boom mounted on a vehicle, which can be detachably attached to an end of a top boom at two positions vertically separated from each other by an upper connecting pin and a lower connecting pin which can be inserted and removed. Has a main winding wire sheave, a boom head having a main winding hook suspended below the sheave, the boom head pivotally attached to a top boom tip with an upper connecting pin, and the lower connecting pin is removed. In the state
A tilt device interposed between the boom head and the top boom tip for tilt-driving the boom head to the front of the boom centering on a pivoted portion by an upper connection pin; and a tilt device provided at a lower front portion of the boom head. The swing shaft is pivotally supported by the swing shaft, and has a contact surface at its lower end with which the main winding hook abuts. After the main winding wire is wound, the main winding hook is brought into contact with the corresponding contact surface, and then is further changed. A hook for a movable crane, comprising: a main winding hook storage arm that is turned around the swing shaft and lifted up to the top boom mounting side of the boom head by being integrally formed with the main winding hook by winding the main winding wire. A storage device, wherein the main winding hook storage arm and the main winding hook in a raised state can be stored between the boom head and the top boom tip in a connected state by the upper connection pin and the lower connection pin. The provided a space, after pulling the main hoisting hook by the main winding hook store arm by winding main hoisting wire in a posture that has issued tilt Zhang forward by the tilting device the boom head,
By tilting and retracting the boom head toward the top boom tip by the tilt device, the main winding hook storage arm and the main winding hook in the raised state are stored in the space between the boom head and the top boom tip. A hook crane for a mobile crane.