JP3338559B2 - crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane for performing a cargo handling operation by using an undulating tower post.

[0002]

2. Description of the Related Art FIGS. 4 to 8 show a cargo handling operation using a tower post which can be raised and lowered, and a cargo handling operation using a tower post and a jib by attaching a jib to the tip of the tower post so as to be able to be raised and lowered. FIG. 4 shows an example of a crane in which a tower post 2 having a required length is provided on an upper part of a traveling device 1 so as to be able to move up and down and turn, as shown in FIG. At the tip of the tower post 2, a main hook 3 is provided so as to be able to be lifted and lowered so that cargo handling work by the tower post 2 can be performed. As shown in FIG. 6, the main hook 3 has a top sheave 10 provided at the tip of the tower post 2, and a front surface 4 on the side where the tower post 2 rises and falls when the tower post 2 stands upright (hereinafter referred to as the front surface of the tower post 2). It is suspended so as to be in a position that protrudes more forward.

[0003] A jib foot 5 is provided at the tip of the tower post 2 so as to protrude forward from the front surface 4 of the tower post 2. As shown in FIG.
A base end portion 7a of the jib 7 is attached via a fulcrum pin 6 so as to be able to be raised and lowered and detachably attached to the jib 7. A hook 8 is provided so as to be able to be suspended.

In the above-mentioned crane, when carrying out the cargo handling work using the tower post 2, the base end of the tower post 2 laid down on the ground is pivotally connected to the traveling device 1, and the tower post is raised and lowered by the post up-and-down wire 9. 4 is raised as shown in FIG. 4, and after assembling the crane, the main hook 3 suspended from the tip of the tower post 2 by the main wire 11 or not shown while turning and undulating the tower post 2 or not shown. General cargo handling work is performed using a bucket or the like.

[0005] When the cargo handling operation is performed using the jib 7, the tower post 2 of a required length is pivoted down on the ground and its base end is pivotally connected to the traveling device 1 as shown by A in FIG. At the jib foot 5 at the tip, the base end 7a of the jib 7 is
5 and the tower post 2 is raised by the post undulating wire 9 as shown in FIG. 5B with the jib 7 held therein, and is raised as shown in FIG. 5C. 5 is extended using the fulcrum pin 6 of the base end portion 7a as a fulcrum as shown in FIG. 5D, and then the tower post 2 is turned, raised and lowered, and the jib 7 is raised and lowered. While holding the auxiliary wire 12 from the tip of the jib 7
Cargo handling work is performed by the sub hook 8 suspended via the.

As shown in FIGS. 6 to 8, a top sheave shaft 13 parallel to the front surface 4 of the tower post 2 is provided at the tip of the tower post 2, and an intermediate portion of the top sheave shaft 13 in the left-right direction. A flat hook block 15 is suspended between the top sheave 10 and a hook sheave 14 around which the main wire 11 is wound a plurality of times. At this time, the sheave groove 10a of the top sheave 10 and the sheave groove 14a of the hook sheave 14 are oriented in a direction orthogonal to the front face 4 of the tower post 2, so that the flat wide surface of the hook block 15 is also 4 is oriented in a direction perpendicular to the direction.

The hook block 15 has a hook pin 16 provided so as to penetrate the flat surface of the hook block 15, in a direction parallel to the flat surface of the hook block 15 (the front surface 4 of the tower post 2). Orthogonal direction)
The main hook 3 that can swing is attached to the main hook 3. One end 17 of the main wire 11 hanging the main hook 3 is fixed to the tip of the tower post 2, and the other end is wound around the main winding drum 19 via the sub-strut guide sheave 18.

[0008]

In the conventional crane described above, since the wide surface of the flat hook block 15 is suspended so as to be orthogonal to the front surface 4 of the tower post 2, as shown in FIG. When the tower post 2 stands up,
There is a problem that the hook block 15 strikes the front surface 4 of the tower post 2 by the swinging, conventionally holds the required spacing L ₁ between the front 4 and the hook block 15 of the tower post 2 To work around this problem as to, and the hoisting center of the top wheel 10 suspending the main hook 3, so as to out Zhang forward at greater distance L ₂ to the front 4 of the tower post 2.

Further, since the main hook 3 is attached to the hook block 15 so as to swing its head in a direction perpendicular to the front surface 4 of the tower post 2, the hook block 1
When the rocker 5 swings, the main hook 3 swings further with the hook pin 16 as a fulcrum, and the tower post 2
To easily collides with the front surface 4 of the larger the distance L ₁ between the front 4 of the hook block 15 and the tower post 2, i.e. it is necessary to further increase the distance L ₂ of the top wheel 10 overhangs to the front .

On the other hand, a jib foot 5 for attaching a jib 7 provided at the tip of the tower post 2 has an interval L ₃ extending from the front face 4 of the tower post 2 in order to reduce a moment load acting on the tower post 2. I try to keep it as small as possible.

For this reason, in the conventional structure, the top sheave 1 is located at a position where the jib foot 5 projects forward.
The outer periphery of 0 has a configuration that projects further forward,
Therefore, when the tower post 2 is laid down on the ground at the time of assembling and disassembling when carrying out the cargo handling work by the tower post 2, the top sheave 10 directly comes into contact with the ground and receives the weight of the tower post 2. 10 has been damaged, or the main wire 11 has been bitten between the top sheave 10 and the ground, and the main wire 11 has been damaged.

The present invention has been made in view of such circumstances, and provides a crane in which a top sheave is not directly in contact with the ground when the tower post is laid on the ground and the crane is assembled or dismantled. It is intended to be.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a top sheave for suspending a main hook is provided at the tip of an up-and-down tower post so as to protrude forward from the front surface of the tip of the tower post. A crane provided with a jib foot that pivots the part so as to extend forward from the front of the tower post, and a required spacing is provided on the top sheave shaft provided at the tip of the tower post in parallel with the front of the tower post. Attach the top sheave, suspend the hook block on the hook sheave with the main wire hanging between the left and right top sheaves in the sheave groove, and swing the head block in parallel with the top sheave axis. by installing an additional main hook, than Jibufuto the top sheave
It is related to a crane characterized by being arranged on the front side of a tower post .

[0014]

According to the present invention, a top sheave shaft parallel to the front surface of the tower post is disposed at the tip of the tower post, and the top sheave shaft is provided with a required interval left and right on the top sheave shaft. Since the hook block is suspended between the left and right top sheaves via the hook sheave, the wide surface of the flat-shaped hook block is suspended in parallel with the front of the tower post. Even if the suspension position is close to the front of the tower post, the same spacing as before can be maintained between the front of the tower post and the hook block, and the swing direction of the main hook is parallel to the front of the tower post. The main hook can be prevented from colliding with the front of the tower post by swinging the neck, so that the front of the tower post and the hook block can be prevented. It can be further reduced than the conventional spacing between.

Therefore, the top sheave can be installed by being retracted from the jib foot to the front side of the tower post, so that the jib foot comes into contact with the ground at the time of assembling or disassembling the crane for lowering the tower post on the ground. As a result, the top sheave is prevented from directly contacting the ground.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention applied to the conventional crane shown in FIGS. 4 to 8.
As shown in FIG. 3, a top sheave shaft 13 is arranged at the tip of the tower post 2 in parallel with the front surface 4 of the tower post 2, and the top sheave shaft 13 is provided with a required space on the left and right with a required space. Attach the main wire 11 hanging between the left and right top sheaves 20 and 21 to the sheave groove 22 a of the hook sheave 22, and attach the hook sheave 2.
2 hangs the hook block 23.

A hook pin 29 is attached to the hook block 23 so as to penetrate the flat wide surface of the hook block 23, and the hook pin 29 can swing in a direction parallel to the front surface 4 of the tower post 2. Attach the main hook 30.

In FIG. 3, reference numeral 24 denotes the left and right top sheaves 2.
An intermediate sheave 25 provided horizontally at another position between 0 and 21 is a sub strut guide sheave, one end of which is fixed to a rope anchor 27 provided on a sub strut guide sheave shaft 26, and the other end of which is a top sheave 21, Hook sheave 22, top sheave 20, intermediate sheave 24, top sheave 21, hook sheave 22, top sheave 20,
Main winding drum 1 via sub strut guide sheave 25
9 is involved. Reference numeral 28 denotes a sub-strut guide sheave for the sub-wire 12 for operating the sub-hook 8 in FIG. Further, the top sheaves 20, 21 and the intermediate sheave 24 are detachably attached to the tip of the tower post 2 so that the jib 7 can be attached to the jib foot 5 and easily removed when used as a tower crane. I have.

Next, the operation of the above embodiment will be described.

As shown in FIGS. 1-3, the tower post 2
Top sheave parallel to the front 4 of the tower post 2
A shaft 13 is provided, and the top sheave shaft 13 is required in the left-right direction.
Attach the top sheaves 20 and 21 at an interval of
Hook sheave 22 between top sheaves 20 and 21 on right
And hang the hook block 23
The sheave groove 22a of the hook sheave 22 is the top sheave.
Flattened shape to be oriented parallel to axis 13
The wide surface of the hook block 23 is
Will be suspended parallel to the front 4
The center of suspension of the main hook 30 by the sheaves 20 and 21
Close to the front surface 4 of the warpost 2 and the distance L_FourSmaller
However, the front block 4 of the tower post 2 and the hook block 23
And the same interval L as before.₁Can be held by
Of the main hook 30 attached to the hook block 23
The swing direction is parallel to the front face 4 of the tower post 2.
Therefore, the main hook 30 swings the tower post 2
Is prevented from colliding with the front surface 4 of the
Distance between the front face 4 of the tower post 2 and the hook block 23
L ₁Can be made smaller than before.

Therefore, the top sheaves 20, 21 can be retracted from the jib foot 5 toward the front side 4 of the tower post 2 and installed, and when the crane for lowering the tower post 2 on the ground is assembled or disassembled, the jib foot 5 is used. Abuts on the ground, so that the top sheaves 20, 21 can be prevented from directly abutting on the ground.

[0023]

As described above, according to the crane of the present invention, the flat surface of the hook block has a wide surface.
Hanging parallel to the front of the strike and swinging the main hook
Direction is parallel to the front of the tower post.
Strikes the front of the tower post by shaking
The top sheave can be retracted to the front of the tower post from the jib foot and installed, so that the jib foot hits the ground when assembling or disassembling the crane that lays the tower post on the ground. The contact prevents the top sheave from directly contacting the ground, thus preventing problems such as damage to the top sheave or damage caused by the main wire being bitten between the top sheave and the ground. It is possible to achieve an excellent effect of being able to do so.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a crane using a tower post of a tower crane of the present invention.

FIG. 2 is a front view of FIG. 1 as viewed from the II-II direction.

FIG. 3 is a perspective view schematically showing a main hook hanging portion of the crane of FIG. 1;

FIG. 4 is a side view of a crane using a tower post of a conventional tower crane.

FIG. 5 is a side view of a tower crane provided with a jib at the tip of a conventional tower post.

FIG. 6 is a side view showing a tip portion of a tower post of a conventional crane.

FIG. 7 is a front view of FIG. 6 as viewed from the VII-VII direction.

FIG. 8 is a perspective view schematically showing a main hook hanging portion of the crane of FIG. 6;

[Explanation of symbols]

 2 Tower Post 4 Front of Tower Post 5 Jib Foot 7 Jib 7a Base 11 Main Wire 13 Top Sheave Shaft 20 Top Sheave 21 Top Sheave 22 Hook Sheave 22a Sheave Groove 23 Hook Block 30 Main Hook

Claims (1)

(57) [Claims] A top sheave for suspending a main hook is provided at the tip of an undulating tower post so as to protrude forward from the front surface of the tip of the tower post, and a jib foot for pivotally connecting a base end of the jib is provided. A crane that is provided to extend forward from the front of the tower post, and a top sheave is attached to a top sheave shaft provided at the tip of the tower post in parallel with the front of the tower post with a required interval on the left and right, left over between the right top wheel droop mainly wires hanging the Fukkushibu the hook block multiplied the sheave grooves, to the hook block, by installing an additional said top sheave shaft parallel to swivelably main hook, Toto
Place the sieve on the front side of the tower post from the jib foot
Crane, characterized in that it was.