JP2547424Y2 - Mobile crane - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a mobile crane, in particular, a mobile type in which the entire upper surface of the telescopic boom is lower than the eye level of an operator seated in a cab when the telescopic boom is in a down state. It relates to cranes.

[0002]

2. Description of the Related Art As shown in FIG. 5, a mobile crane of this type includes a turntable 2 having a turntable 3 and a pair of left and right boom support brackets 4 and 5 erected on the turntable 3. A boom base bracket 7 above the base end of the telescopic boom 6 with the base end of the telescopic boom 6 mounted between the pair of left and right boom support brackets 4 and 5 so as to be pivotably driven on the lower traveling body 1. And a pair of left and right boom support brackets 4, 5 are pivotally connected to each other by a fulcrum shaft 8, and the telescopic boom 6 can be driven up and down by a raising and lowering cylinder 9 interposed between the telescopic boom 6 and the swivel 2. And one of the boom support brackets 5
The operator's cab 10 for both traveling operation of the lower traveling body 1 and crane operation is mounted so as to be positioned outside the vehicle, and the hook block 13 is suspended from the tip of the telescopic boom 6 by the wire rope 12 from the winch device 11. doing. When the telescopic boom 6 is lying down, the entire upper surface of the telescopic boom 6 is configured to be lower than the eye height position P of the operator sitting in the cab 10.

In the mobile crane thus constructed, the telescopic boom 6 that has been reduced during the traveling movement of the mobile crane is folded down toward the front of the lower traveling body 1, and then the lower traveling body 1 is operated from the cab 10. However, since the upper surface of the telescopic boom 6 in the lying state is lower than the height position P of the eyes of the operator, there is an excellent effect that a view can be secured over the upper surface of the telescopic boom 6. ing.

[0004] In a conventional mobile crane of this type, a winch device 11 is attached to an upper rear end portion of a base end boom 6a of a telescopic boom 6, so that the winch device 11 is mounted on a movable crane. There is a problem that the view over the upper side surface of the telescopic boom 6 in the traveling state is hindered. Moreover, such an arrangement of the winch device 11 increases the center of gravity of the mobile crane, had an adverse effect on the stability at the time of travel and move.

[0005]

SUMMARY OF THE INVENTION The present invention aims to provide a mobile crane which solves such a problem.

[0006]

In order to achieve the above object, the mobile crane according to the present invention is configured as follows. A turntable having a turntable and a pair of left and right boom support brackets erected on the turntable is mounted on the lower traveling body so as to be freely rotatable, and the base end of the telescopic boom is supported by the pair of left and right booms. In the state located between the brackets, the boom base bracket at the base end of the telescopic boom and the pair of left and right boom support brackets are pivotally connected with the fulcrum shaft,
The telescopic boom can be driven up and down by a hoisting cylinder interposed between the telescopic boom and an appropriate position of the swivel base, and the lower traveling body can be moved so that the telescopic boom is positioned outside the one boom support bracket on the swivel base. A mobile crane in which a cab for both operation and crane operation is installed, and a hook block is suspended from the tip of the telescopic boom by a wire rope from a winch device, especially when the telescopic boom is in the down position. In a mobile crane configured so that the entire area is lower than the eye level of an operator seated in a cab, the winch device is provided outside of the other boom support bracket so as not to protrude from the upper surface of the telescopic boom in a downright state. And the up-and-down fulcrum axis is at the rear upper end of a pair of left and right boom support brackets. Mobile crane, characterized in that arranged in.

[0007]

The mobile crane of the present invention constructed as described above has a pair of boom support brackets on the left and right sides of the swivel platform, which are located outside the other boom support bracket (the boom support bracket on the side opposite to the side where the cab is located). The winch device is placed on the swivel so that it does not protrude from the upper surface of the telescopic boom in the overturned state. The traveling movement of the mobile crane can be performed safely without the winch device being hindered. Further, since the height of the center of gravity of the mobile crane is reduced, the stability during traveling movement is improved.

[0008]

FIG. 1 shows an embodiment of a mobile crane according to the present invention.
This will be described with reference to FIG. The mobile crane of the present invention has a feature in the mounting position of the winch device 11 as compared with the conventional mobile crane shown in FIG. 5 and described above. Invite what you have explained.

In FIG. 1 to FIG.
Are a pair of left and right boom support brackets 4, 5 of the swivel 2
Is located outside the other boom support bracket 4 (the boom support bracket 4 on the side opposite to the side where the operator's cab 10 is located) on the swivel 2. The arrangement height of the winch device 11 is such that the winch device 11 does not protrude upward from the upper side surface of the telescopic boom 6 which is in a substantially horizontally laid state. The up / down fulcrum shaft 8 is disposed at the rear upper end of the pair of left and right boom support brackets.

In this embodiment, the winch device 11 includes an input shaft 14 and a pair of deceleration output shafts 1 having a parallel relationship with each other.
5.16 and a spur gear train (not shown) connecting the shafts 14, 15, and 16 for rotatably supporting the gear case 1.
7 and the gear case 1 of the speed reducer 18
7, the winch drums 19, 20 fitted to the respective deceleration output shafts 15, 16, respectively, and one side of the gear case 17 of the reduction gear 18 (the deceleration output shafts 15, 1).
6 extending side) and a hydraulic motor 21 whose output shaft is connected to the input shaft 14 of the speed reducer 18. On the other boom support bracket 4 of the swivel 2,
The winch attachment members 22, 22,... Extending outward from the outer surface of the boom support bracket 4 are attached.

The winch device 11 is configured such that the winch drums 19 and 20 are located on the other boom support bracket 4 side, and the gear case 17 is fixed to the outer ends of the winch mounting members 22 (22). ), It is arranged on the swivel 2 outside the other boom support bracket 4 . The extended ends of the pair of deceleration output shafts 15 and 16 of the winch device 11 are rotatably hindered by bearings 23 and 24 arranged outside the boom support bracket 4. Each winch drum 19, 2
The brake drums 25a, 26a arranged at the end of the gear case 17 and the brake bands 25b, 2 for tightening the brake drums 25a, 26a.
6b are mounted. Also, at the end of the winch drums 19, 20 on the gear case 17 side, an inwardly expanding clutch (not shown) mounted around the deceleration output shafts 15, 16 and slidingly contacting the inner surfaces of the brake drums 25a, 26a. Is attached.

When the winch device 11 is arranged on the swivel 2 outside the other boom support bracket 4 so as not to protrude from the upper surface of the telescopic boom 6 in the lying down state, a configuration as in this embodiment is adopted. The winch drums 19 and 20 can be arranged close to the outer surface of the other boom support bracket 4. That is, the amount of deviation between the center in the left-right direction of the winch drums 19 and 20 and the center in the left-right direction of the telescopic boom 6 can be reduced, and a later-described fleet-angle pulley disposed at the distal end of the base end boom 6a of the telescopic boom 6. There is an effect that the influence on the protrusion amount of the 27 and 28 (the protrusion amount of the telescopic boom 6 to the other side) can be reduced.

Reference numerals 27 and 28 denote fleet-angle pulleys that extend from the base boom 6a of the telescopic boom 6 to the other end (the side opposite to the cab 10 and to the winch device 11). 29 and 30 are guide pulleys arranged above the intermediate boom 6b of the telescopic boom 6. The winch drums 31 and 32 are located above the winch drums 19 and 20, respectively.
Guide pulleys rotatably supported on shafts 31a and 32a arranged on the swivel 2 in parallel with the rotation center axes 9 and 20 (deceleration output shafts 15 and 16).
It is movable along the axes 31a and 32a.

The wire rope extending from the winch device 11 to the end of the telescopic boom 6 passes through the following route. That is, the wire rope 12a from the winch drum 19
Reaches the distal end of the telescopic boom 6 via the guide pulley 31, the fleet angle pulley 27, and the guide pulley 29 in this order.
The wire rope 12b from the winch drum 20
Reaches the distal end of the telescopic boom 6 via the guide pulley 32, the fleet angle pulley 28, and the guide pulley 30 in this order.
The wire rope 12a is used to suspend the main hook block 13a from the tip of the telescopic boom 6, and the wire rope 12b is used to suspend the sub hook block 13b from the tip of the telescopic boom. I have.
The fleet angle pulleys 27 and 28 are arranged so that the radial direction is parallel to the upper surface of the telescopic boom 6. The guide pulleys 29 and 30 are also arranged so that their radial directions are parallel to the upper surface of the telescopic boom 6. According to such an arrangement of the fleet angle pulleys 27 and 28 and the guide pulleys 29 and 30, since the amount of projection of these pulleys from the upper side surface of the telescopic boom 6 is small, these pulleys obstruct the view through the telescopic boom 6. Has the effect of minimizing the

According to the mobile crane constructed and operated as described above, the winch device does not obstruct the view over the upper surface of the telescopic boom in the traveling state of the mobile crane with the telescopic boom turned down. Therefore, the traveling movement of the mobile crane can be performed safely. Further, since the height of the center of gravity of the mobile crane is reduced, the stability during traveling movement is improved.

[Brief description of the drawings]

FIG. 1 is a side view of the mobile crane of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a side view of a winch device.

FIG. 4 is a view taken in the direction of arrows XX in FIG. 3;

FIG. 5 is a side view of a conventional mobile crane.

[Explanation of symbols]

 Reference Signs List 1 lower traveling body 2 turntable 3 turntable 4 boom support bracket 5 boom support bracket 6 telescopic boom 7 boom base end bracket 8 hoisting fulcrum shaft 9 hoisting cylinder 10 cab 11 winch device 12a, 12b wire rope 13a, 13b hook block

Claims (1)

(57) [Scope of request for utility model registration] 1. A turntable having a turntable and a pair of left and right boom support brackets erected on the turntable is mounted on a lower traveling body so as to be freely rotatable, and the base end of the telescopic boom is connected to the turntable. A pair of left and right boom support brackets and a pair of left and right boom support brackets are pivotally connected to each other with a pair of left and right boom support brackets in a state positioned between the pair of left and right boom support brackets. And a driving cab for both lowering body traveling operation and crane operation is mounted on the swivel base so that it is located outside one boom support bracket. , Mobile crane with hook block suspended from the end of telescopic boom by wire rope from winch device, especially telescopic boom In the mobile crane configured such that the entire upper surface of the telescopic boom is lower than the eye level of the operator seated in the cab in the state, the winch device does not protrude from the upper surface of the telescopic boom in the downright state. A mobile crane which is arranged on a swivel table outside the other boom support bracket, and wherein the fulcrum shaft is arranged at the rear upper end of a pair of left and right boom support brackets.