JPH07267583A - Crane vehicle - Google Patents

Abstract

PURPOSE:To limit a fleet angle arranged as not admitting passage of a wire rope on a cabin within a specified range by inclining a winch shaft to an angle below a rectangle relative to the center of a boom, and furnishing a horizontal guide sheave which serves as a fulcrum for the fleet angle. CONSTITUTION:A winch 1 is mounted outside of a revolving frame 9 which supports the left and right sides of a base step boom 6c. The shaft 1a of this winch 1 is installed as inclining at an angle below 90 deg. relative to the boom center 6a and is located in relation to a horizontal guide sheave 4 which serves as a fulcrum for a fleet angle arranged as not admitting passage of a wire rope 2 on a cabin 3. This enables limiting the fleet angle within the specified range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile crane having a structure in which one winch and one winch and one guide sheave are arranged on the outside of a swing frame that supports a multi-stage telescopic boom on the left and right. is there.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open No. 3-64986, a conventional mobile crane has a fulcrum of a winch a, a wire rope b, a cabin c and a fleet angle as shown in a side view of FIG. 8 and a plan view of FIG. In general, the guide sheave d and the guide sheave e are arranged, and there is a problem that the wire rope passes over the cabin and the wire rope hits the cabin or stains it. Further, when the horizontal guide sheave g is provided on the boom, the angle formed by the horizontal guide sheave g and the wire rope b changes during traveling and ups and downs as shown in the side view of FIG. 10 and the rear view of FIG. The wire rope b easily comes off the horizontal guide sheave g. In the figure, f is a foot pin and h is a boom.

[0003]

In the conventional structure shown in FIGS. 8 and 9, the distance between the guide sheaves d and e is set long because the fleet angle is limited to a small value, and the wire rope b is accommodated in the cabin. It often comes to pass on c. Further, since the winches a are arranged on the left and right side surfaces of the boom h, the distance between the center of the width of the winch a and the center of the boom h in the width direction becomes large, and the horizontal guide sheave is placed on the boom h as shown in FIG. g to limit the fleet angle to a small value, and wire rope b on the cabin c.
When the boom h is raised and lowered, the angle θ shown in FIG. 10 is generated between the horizontal guide sheave g and the wire rope b, and the wire rope b is easily disengaged.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a fleet in which a winch shaft is tilted within 90 degrees with respect to a boom center and a wire rope is arranged so as not to pass through a cabin. Provide a horizontal guide sheave that serves as a fulcrum for the angle. Further, if necessary, a part of the winch is driven so as to overlap with the boom in a plan view, or driven so as to overlap only with the boom of the base stage. In order to keep the distance from the horizontal guide sheave, keep the guide sheave for the winch on the revolving frame at the same center as the foot pin, or center the guide sheave in front of and below the center of the foot pin. Position the rope end above the top plate of the boom base.

[0005]

By adopting the above-described arrangement, the wire rope does not pass over the cabin, and the second boom can be arranged so as to project rearward. Further, since there is no angle between the wire rope and the horizontal guide sheave when the boom is raised and lowered, there is no risk of the wire rope coming off the guide sheave. Furthermore, the distance from the horizontal guide sheave is secured, and the fleet angle can be limited within the standard value.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment will be described below with reference to the drawings. 1 and 2 are a top view and a side view of a mobile crane according to the present invention, and FIG. 3 is a detailed plan view of a winch portion in FIG. As shown in FIGS. 1 and 3, the winch 1 is attached to the outside of a revolving frame 9 that supports the left and right side surfaces of the base boom 6c, and the shaft 1a of the winch 1 has a boom center 6
It is inclined within 90 degrees with respect to a and is positioned with respect to the horizontal guide sheave 4 which is a fulcrum of the fleet angle. The winches 1 provided on the left and right sides usually have different specifications and dimensions due to the difference in the lifting capacity. The horizontal guide sheave 4 is mounted close to the cabin 3 from the tip of the base boom 6c. From the tip of the boom to the horizontal guide sheave 4, pass the wire rope 2 over the base boom 6c, and from the horizontal guide sheave 4. The distance of the wire rope 2 to the winch 1 passing through the guide sheave 5 is set to be long so as to be within the standard value of the fleet angle.

Since the wire rope 2 does not pass over the cabin 3 by adopting the above arrangement of the horizontal guide sheave 4, the wire rope 2 does not obstruct the view of the skylight of the cabin 3 and the wire rope 2 It is possible to prevent the grease from dripping to stain the skylight of the cabin 3, and the wire rope 2 to hang down to hit the roof or skylight of the cabin 3 or break the wiper. Further, the distance from the horizontal guide sheave 4 to the winch 1 is long, and the standard value of the fleet angle is secured.

Although the base boom 6c and the winch 1 may or may not overlap in the side view of FIG. 2, as shown in FIG. 3, the base boom 6c is in plan view.
It is advantageous for the treatment of the wire rope 2 to drive the winch 1 to a position where the winch 1 and the boom width direction center 6a and the center of the width w of the winch 1 are as close as possible. Further, since the second boom 7 and the winch 1 are arranged so as not to overlap each other in a plan view, the second boom 7 can be projected rearward, and the amount of protrusion of the boom forward when the crane vehicle travels can be reduced. It will be possible. If the second boom is prevented from jumping backward, the winch 1 may be driven to a position where it overlaps a boom other than the base boom 6c. This would be a further advantage over the fleet angle and would move the wire away from the cabin.

4 to 7 are a side view and a rear view showing the relationship between the guide sheave 5 provided on the cylinder of the revolving frame 9 and the foot pin 8, FIG. 4 showing the first embodiment and FIG. 6 showing the second embodiment.
FIG. 5 shows a rear view of the first embodiment, and FIG. 7 shows a rear view of the second embodiment. In the first embodiment shown in FIG. 4, the center of the guide sheave 5 is the foot pin 8 whose fulcrum fulcrum is the boom.
The centers of the two are aligned, and the foot pin 8 and the shaft of the guide sheave 5 are integrated as shown in the rear view of FIG. In the second embodiment shown in FIGS. 6 and 7, the center of the guide sheave 5 has a center in front of and below the center of the foot pin 8 which serves as the undulating fulcrum of the boom, and the wire rope end 5a of the guide sheave 5 is used as a base stage. The boom 6 is arranged above the top plate 6b.

In the first embodiment shown in FIG. 4, the distance A between the wire rope 2 and the upper plate 6b of the base boom 6c is always kept constant when the boom is raised and lowered. In the second embodiment shown in FIG. The distance B between 2 and the upper plate 6b of the base boom 6c is always kept constant when the boom is raised and lowered. Therefore, there is no angle between the wire rope 2 and the horizontal guide sheave 4 when the boom is raised and lowered.
There is no danger of coming off. Further, in the case of the second embodiment,
Since the center of the guide sheave 5 on the revolving frame 9 is lowered, the guide sheave 5 which is the upper end portion of the mobile crane during traveling.
And the like, the crane vehicle can be mounted at a low height, and the protrusion of the rear end of the swing frame 9 can be reduced during work.

[0011]

The present invention is constructed as described in detail above, and has the following many effects. First of all, since the wire rope does not pass over the cabin, the wire rope does not obstruct the view of the skylight of the cabin, and grease drips from the wire rope to stain the skylight of the cabin, or the wire rope hangs down so that the roof of the cabin or No need to hit the skylight or break the wiper. On the other hand, if it is arranged so that it only overlaps with the base boom when seen in a plan view, the second boom can be made to pop out rearward, and the amount of boom extension in front when the crane truck travels is reduced. Therefore, driving safety is improved. Also, since there is no angle between the wire rope and the horizontal guide sheave when the boom is raised and lowered, there is no risk of the wire rope coming off the guide sheave, and the distance from the horizontal guide sheave is secured.Therefore, limit the fleet angle to within the standard value. You can
Furthermore, when the center of the guide sheave on the revolving frame is lowered, the guide sheave, which is the upper end of the mobile crane during traveling, is installed low, and the overall height of the mobile crane can be reduced, which greatly contributes to work safety and safe traveling. be able to.

[Brief description of drawings]

FIG. 1 is a plan view of a mobile crane showing an embodiment of the present invention.

FIG. 2 is a side view of a mobile crane showing an embodiment of the present invention.

FIG. 3 is a detailed view of a winch portion in plan view of FIG.

FIG. 4 is a side view showing the relationship between the guide sheave having the same center as the foot pin and the wire rope.

FIG. 5 is a rear view of FIG.

FIG. 6 is a side view showing the relationship between a guide sheave having a center forward and downward from the center of the foot pin and a wire rope.

FIG. 7 is a rear view of FIG.

FIG. 8 is a side view of a conventional mobile crane.

FIG. 9 is a plan view of a conventional mobile crane.

FIG. 10 is a relationship diagram between a horizontal guide sheave and a wire rope in a conventional mobile crane.

11 is a rear view of FIG.

[Explanation of symbols]

1 winch 1a winch shaft 2 wire rope 3 cabin 4 horizontal guide sheave 5 guide sheave 5a wire rope end 6 boom 6a boom center 6b top plate 6c base boom 8 foot pin 9 swivel frame θ horizontal guide sheave and side of wire rope in side view Angle between

Claims (5)

[Claims] 1. When the winch 1 is installed outside the swing frame 9 on the left and right sides of the boom 6, the winch shaft 1a is tilted within 90 degrees with respect to the boom center 6a, and the wire rope 2 is mounted on the cabin 3. Do not pass
A crane vehicle that has a horizontal guide sheave 4 that serves as a fulcrum for the fleet angle. 2. The crane vehicle according to claim 1, wherein the winch 1 is arranged so as to be partly overlapped with the boom 6 toward the base boom 6c side in a plan view. 3. The mobile crane according to claim 2, wherein the winch 1 is arranged so as to partially overlap the base boom 6 toward the base boom 6c side in a plan view. 4. A base boom 6 for guiding the wire rope 2.
A crane vehicle comprising a horizontal guide sheave 4 on c and a guide sheave 5 on a revolving frame 9 having the same center as the center of the foot pin 8. 5. A swivel having a horizontal guide sheave 4 on the base boom 6c and a center forward and downward from the center of the foot pin 8 so that the horizontal guide sheave 4 and the wire rope 2 do not form an angle θ when the boom is raised and lowered. A crane vehicle in which a guide sheave 5 provided on a frame 9 is arranged, and a wire rope end portion 5a of the guide sheave 5 is arranged above an upper surface plate 6b of a base boom 6c.