JP2579702B2 - Wheel 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 wheel crane such as a rough terrain crane.

[0002]

2. Description of the Related Art The general structure of a conventional wheel crane is shown in FIG.

A is a lower traveling body, B is an upper revolving superstructure mounted on the lower traveling body A, 1 is a revolving frame of the upper revolving body B, which is on either one of the left and right sides of the revolving frame 1 (usually, On the right side, which will be described later in this example), a cabin 1a that is used for both crane operation and traveling is installed.

A winch box 1b is provided at a rear portion of the revolving frame 1. Inside the winch box 1b, a main winding winch W1 for winding and driving the main winding rope R1 is provided.
And auxiliary winch W2 for winding and driving auxiliary rope R2
Is housed.

Reference numeral 2 denotes a counterweight attached to the rear surface of the winch box 1b.

[0006] On the other hand, reference numeral 3 denotes a boom.
1 is provided, and the boom foot 31 is pivotally attached to the upper end of the revolving frame 1 by a boom foot pin 32, so that the boom 3 is raised and lowered about the boom foot pin 32, and the cabin 1a It crosses the side of the. 3a is a boom hoist cylinder.

A gantry 4 is provided at the base end of the boom 3 and has two gantry sheaves 41 and 42.
The main and auxiliary winding ropes R1, R2 drawn from the winches W1, W2 are guided toward the boom tip by the gantry sheaves 41, 42.

[0008]

However, according to the conventional crane in which the winches W1 and W2 (winch box 1b) are provided at the rear of the revolving frame 1 as described above, the winch W1 and W2 are provided above the winches W1 and W2 for maintenance of the winch. Space needs to be secured, and gantry seeds 4
The gantry sheave 41,
It is desirable that the boom foot 31 be located forward of the winches W1, W2, and so on.
Therefore, the entire boom is located closer to the front.

Therefore, when the crane is running, the boom 3
The overhang amount (projection amount to the front of the vehicle) X becomes large, so that the forward visibility during traveling deteriorates, and the minimum turning radius becomes large, so that the narrow space approachability (so-called small turnability) deteriorates. there were.

It is conceivable to reduce the overhang X by shortening the boom 3, but this reduces the lifting lift during crane operation.

It is also possible to replace the boom 3 by installing the winches W1 and W2 (the winch box 1b) further rearward, but in this case the turning radius of the rear end of the upper revolving unit B becomes large, and particularly it becomes narrow. Adversely affects the work at the place.

Accordingly, the present invention provides a wheel crane capable of reducing the amount of overhang of the boom without adversely affecting the head and / or the rear end turning radius while ensuring good visibility during traveling. Is what you do.

[0013]

According to the present invention, an upper revolving unit is mounted on a lower traveling unit so as to be pivotable about a vertical axis, and a revolving frame of the upper revolving unit is operated for both crane operation and traveling. In a wheel crane provided with a cabin shared as a room and an undulating boom,
A boom foot is provided on a base end portion of the boom on the upper surface side in the boom lying state so as to protrude upward from the boom upper surface in the boom lying state, and the boom is provided on the turning frame. It is pivotally attached and becomes a boom raising and lowering fulcrum. (Ii) It is arranged so as to cross the side of the cabin at a position below the eye point in the cabin when running down while driving, and winds up the hoisting rope. Winch,
A rope hook installed at a position behind the driver's seat in the cabin in the boom lying state on the upper surface of the boom and a rope pulled out of the winch approaching the upper surface of the boom at a lateral position of the cabin on the upper surface of the boom. Is provided.

[0014]

As described above, by installing the winch on the boom instead of the swivel frame, the position of the boom pivot point is not restricted by the winch in the front-rear direction. And the entire boom can be retracted.

Therefore, the amount of overhang of the boom during traveling can be reduced as compared with the related art without causing the adverse effects of a reduction in the lifting height and an increase in the rear end turning radius.

Further, since the winch is located at a higher position than the upper surface of the boom, the hoisting rope pulled out from the winch can be directly directed to the end of the boom. That is, a gantry that is required for a conventional crane is not required.

When the winch is installed on the base end side of the upper surface of the boom, the winch protrudes rearward from the rear end of the revolving structure in a state where the boom is upright, and the rear end turning radius increases.
Therefore, at a work site where there is not enough room for the turning space, the maximum angle at which the boom can be raised is suppressed to be smaller than the original maximum rising angle, and there is a problem that the lifting height is reduced.

Although this problem can be solved by shifting the winch forward, the following disadvantages occur.

That is, in the present invention, by disposing the boom so as to cross the side of the cabin below the eye point in the cabin in a lying state during traveling,
The visibility during driving is significantly improved.

However, if the winch is shifted forward on the upper surface of the boom as described above, the winch will be located on the side or diagonally forward of the cabin, so that the visibility of the crane when traveling will be poor, and the entire boom will have an eye point. The significance of crossing the side of the cabin below and the significance of reducing the amount of boom overhang to improve visibility during running are halved. In addition, when the winch approaches the boom tip side, the suspension ability of the boom is reduced.

Therefore, in the present invention, the boom foot is provided on the upper surface side of the base end of the boom so as to protrude above the upper surface of the boom (upward when the boom is lying down), and this boom foot is pivoted to the turning frame. It was worn and became the fulcrum of the boom.

With this arrangement, the boom upper surface is displaced forward in the boom standing state by an amount corresponding to the protrusion of the boom foot.
As a result, the winch can be installed at the base end side of the boom as far as possible, that is, at a position as far away from the driver's seat as possible, without protruding backward from the rear end of the revolving superstructure in the maximum standing state of the boom.

[0023] Thereby, the side visibility at the time of traveling is improved,
The rear end turning radius can be reduced, and a high head can be obtained.

Further, since the boom can be set at a lower position below the eye point in the boom lying state by the protruding boom foot, the visibility during traveling can be improved.

Moreover, since the boom raising / lowering fulcrum itself does not become lower, the lifting lift does not decrease.

That is, by projecting the boom foot, it is possible to more easily achieve the intended purposes of improving the visibility during traveling and securing the lifting lift.

Further, in order to pull the rope pulled out from the winch to the upper side of the boom by hanging the rope,
There is no risk that the rope will cross the vicinity of the eye point and obstruct the side view. That is, the visibility during traveling can be further improved.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

C is a lower traveling body, D is an upper revolving superstructure, 5 is a revolving frame, 5a is a cabin, 51 is a driver's seat provided in the cabin 5a, 6 is a boom, and 6a is a boom hoist cylinder.

The boom foot 61 of the boom 6 is provided on the rear side of the base end of the boom (upper side in the boom down state) so as to protrude above the boom back surface 64 in the boom down state (especially (See FIG. 4). In FIG. 4, α indicates a protrusion dimension of the boom foot 61 with respect to the boom back surface 64.

In this crane, the turning frame 5 is formed longer behind the turning frame 1 of the conventional crane shown in FIG. 4, and a boom foot 61 is attached to the rear end of the turning frame 5 by a boom foot pin. Boom up and down fulcrum by pivoting at 62, boom 6
In the cabin 5a at a position lower than the eye point (standard viewpoint position of the driver) P in the cabin when the vehicle is running down
It is arranged to cross the side of.

On the other hand, a winch box 7 is set on the upper surface of the boom 6 in the down state, and the winches W1, W2
Is housed.

As described above, by installing the winches W1 and W2 on the boom 6 instead of the revolving frame 5, the position of the boom pivot point by the boom foot pin 62 is higher than that of the conventional winches W1 and W2. You will not be restricted from the front. For this reason, the boom pivot point can be located behind the conventional crane.

As a result, the entire boom is retracted more than in the conventional case, and the overhang amount X of the boom 6 during running is reduced.
Can be greatly reduced compared to the conventional crane boom overhang amount X.

The winch box 7 (winch W
1, W2) is installed on the upper surface of the boom, so that the winches W1, W2 are located at a higher position than the upper surface of the boom, and the ropes R1, R2 drawn from the winches W1, W2 can be directly directed toward the tip of the boom. it can. That is, the gantry 4 that was required for the conventional crane of FIG.
This crane makes it unnecessary.

Accordingly, the structure of the upper swing body D can be simplified and lightened, and the cost can be reduced.

The winches W1 and W2 are located at the base end of the upper surface of the boom, that is, behind the eye point P in the cabin 5a, and at the boom maximum standing state shown in FIG. That is, it is provided at a position where it does not protrude rearward from the rear surface of the counterweight 8 attached to the rear end of the turning frame 5.

Here, as described above, the boom foot 61
Is provided on the upper surface side of the boom base in the boom down state in a state protruding upward in the boom down state from the boom upper surface 64, so that the base end of the boom itself is not provided without such a protruding portion. The boom upper surface, which is the winch installation surface, is located forward in the boom maximum standing state in FIG. 4 as compared with the case where the portion is pivotally attached to the revolving frame 5 as a boom foot.

Accordingly, the winches W1, W2 are shifted forward, and it is possible to install the winches W1, W2 as close to the boom base end as possible without protruding from the rear end of the revolving superstructure in the state where the boom is in the maximum standing state. Become.

That is, without increasing the rear end turning radius,
Moreover, the winches W1 and W2 can be installed on the base end side of the boom, which does not hinder the side view during traveling, while ensuring the original boom maximum standing angle.

Also, the ropes R1, R2 pulled out from the winches W1, W2 cross the vicinity of the eye point P during traveling of the crane so as not to obstruct the side view, so that the lateral positions of the cabin 5a on the upper surface of the boom are left and right. A pair of tubular rope hooks 63 are provided substantially horizontally, and the ropes R1, R2 are hooked on the rope hooks 63 to approach the upper surface of the boom.

Incidentally, the winches W1 and W2 can be mounted on the upper surface of the boom in an exposed state without being housed in the winch box 7.

[0043]

As described above, according to the present invention, (i) by installing the winch on the upper surface of the boom instead of the swivel frame, the boom pivot point is positioned as far as possible regardless of the winch. Because you can
The amount of overhang of the boom at the time of traveling can be reduced as compared with the related art without causing the adverse effects of reducing the lifting lift and increasing the rear end turning radius.

[0044] For this reason, the forward visibility during traveling is improved, so that traveling safety is improved, driver fatigue is reduced, and traveling in narrow places is improved.

Further, since a gantry for guiding the rope drawn out from the winch toward the end of the boom is not required, the structure of the upper swing body can be simplified and lightened, and the cost can be reduced.

(Ii) A boom foot is provided on the base end portion of the boom at the upper surface side in the boom-down state in a state of protruding above the boom upper surface in the boom-down state, and the protruding boom foot is attached to the turning frame. And the winch is installed at a position behind the driver's seat in the cabin on the upper surface of the boom when the boom is in the downturned state. Instead of protruding backward from the end, it can be installed at the base end side of the boom as much as possible, that is, at a position deviated rearward from the driver's seat.

With this arrangement, the winch is installed on the upper surface of the boom, so that the rear end turning radius does not increase and the lateral visibility during traveling does not deteriorate, and the boom is raised up to the original maximum standing angle. It is possible to increase the head.

Further, since the boom foot is protruded, the boom can be set at a lower position below the eye point in the boom-down state by the protruding portion.
The visibility during driving can be improved.

In addition, since the boom raising / lowering viewpoint itself is not lowered, the lifting height is not reduced.

That is, by projecting the boom foot, the intended purposes of improving the visibility during traveling and ensuring the lifting height can be more easily achieved.

Further, since the rope pulled out from the winch is pulled toward the boom upper surface by rope hanging,
There is no risk that the rope will cross the vicinity of the eye point and obstruct the side view. That is, the visibility during traveling can be further improved.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel crane according to an embodiment of the present invention.

FIG. 2 is a plan view of the crane.

FIG. 3 is an enlarged sectional view taken along the line II of FIG. 1;

FIG. 4 is a partially enlarged side view of the crane in a state in which the boom is in a maximum standing position.

FIG. 5 is a side view showing a conventional example.

[Explanation of symbols]

 C Lower traveling structure D Upper revolving structure 5 Revolving frame 5a Cabin 6 Boom 61 Boom foot 62 Boom foot pin 64 Boom upper surface W1, W2 Winch R1, R2 Hoisting (main winding) rope 63 Rope hook 7 Winch box

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 50-38063 (JP, U) Japanese Utility Model Showa 47-7866 (JP, U) Japanese Utility Model Showa 57-131580 (JP, U) Japanese Utility Model Showa 57- 191786 (JP, U) JP-B-55-20993 (JP, B2) American Hoist & Derrick Co. Catalog "AM ERICAN POW'R-CRANE MODEL R213". (Distributed in December 1977)

Claims (1)

(57) [Claims] An upper revolving structure is mounted on a lower traveling structure so as to be rotatable about a vertical axis, and a revolving frame of the upper revolving structure has a cabin shared as a cockpit for both crane operation and traveling. In a wheel crane provided with an up-and-down boom, a boom foot is provided on an upper surface side of the base end of the boom in the boom down state in a state protruding upward from the boom upper side in the boom down state, and the boom is provided. (I) The boom foot is pivotally attached to the turning frame to become a boom raising / lowering fulcrum. (Ii) The boom foot is disposed so as to cross the side of the cabin at a position lower than an eye point in the cabin when the vehicle is running down. On the other hand, a winch that drives the winding rope
A rope hook installed at a position behind the driver's seat in the cabin in the boom lying state on the upper surface of the boom and a rope pulled out of the winch approaching the upper surface of the boom at a lateral position of the cabin on the upper surface of the boom. A wheel crane characterized by comprising: