JP2531487Y2 - Mobile 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 unloading used in construction of high-rise buildings and the like, and more particularly to a mobile crane which can run continuously on two tracks having a variable curvature.

[0002]

2. Description of the Related Art In construction work of a high-rise building, a tower crane 110 as shown in FIG. 10 is used for unloading and transporting materials such as steel materials. The tower crane 110 is usually installed on the foundation of a building 112 or on a steel frame, and has a large working radius and a large lifting load, so that it is frequently used for various works on a construction site.

[0003] However, when each operation is performed in parallel,
Also, when the unloading amount is large, if only one tower crane 110 is used, a so-called crane waiting state occurs, and the process is delayed. To cope with this, it is conceivable to install a large number of tower cranes 110.
There are restrictions on the number of tower cranes 110 to be installed due to twelve site conditions and structural restrictions.

Therefore, apart from the tower crane 110 for unloading and transporting main members such as steel frames, a mobile crane 114 for unloading and transporting relatively lightweight materials such as walls and outer wall materials of curtain walls is mounted on the inner wall of the building 112. It has been proposed to install it on a wall or outer wall (see FIG. 11).

However, as shown in FIG. 11, the mobile crane 114 generally used must be on the track of a double rail 116 installed straight or a double rail 117 installed at a constant curvature. I could not run.

For this reason, when the mobile crane 114 is used in a building of various shapes, such as an elliptical shape or a truck shape, which is currently being constructed, the mobile crane 114 is provided for each section where the external shape of the building changes. The work efficiency of the mobile crane 114 per vehicle was reduced because they had to be arranged separately. In order to be able to continuously travel on tracks with different curvatures, it was necessary to use monorail tracks. Conceivable.

However, as shown in FIG. 10, on a monorail, a direction in which a hoist 118 attached to a movable crane 114 comes into contact with or separates from a wall surface of a building 112 (arrow C).
Direction), in other words, it is only possible to move along the track, causing a disadvantage that the unloading work efficiency is reduced.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and has as its object to provide a mobile crane which can continuously move on two guide rails having a variable curvature.

[0009]

According to a first aspect of the present invention, there is provided a mobile crane which travels on two guide rails, following a change in curvature of a travel path formed by the guide rails. A traveling wheel that travels, a driving unit that drives at least one of the traveling wheels, a plate that pivotally supports the traveling wheel, a lateral roller that is pivotally supported by the plate and abuts a side surface of a guide rail, and the plate A swing device provided at a connection portion with a crane girder supporting a hoist for unloading and rotatably supporting the crane girder; And a follower that is supported so as to be swingable in the gauge direction.

A mobile crane according to a second aspect of the present invention is characterized in that the driving means simultaneously drives all traveling wheels traveling on one guide rail.

According to a third aspect of the present invention, there is provided a follower device provided with an arm which is provided at a connection portion between the turning device and the crane girder and which supports the crane girder so as to be swingable in a direction between the guide rails.

According to a fourth aspect of the present invention, there is provided a
A suspension member for supporting the loader and
A support having a roller for slidably supporting the suspension member;
And a holding member.

According to a fifth aspect of the present invention, a mobile crane is provided with a lower roller which is pivotally supported by the plate and abuts against the bottom surface of the guide rail.

[0014]

In the mobile crane according to the first aspect, at least one of the traveling wheels traveling on the two guide rails is driven by the driving means. Accordingly, the traveling wheels other than the driven traveling wheels follow the traveling wheels, so that it is not necessary to adjust the traveling speed of the traveling wheels traveling on the inner guide rail and the outer guide rail. In addition, since each of the running wheels is rotatable without being restrained by the crane girder by the turning device, the running wheels can be guided by the horizontal rollers and run following changes in the curvature of the running path. Furthermore, even if the gauge is not constant due to the installation error of the guide rail, the follower can swing the crane girder in the direction of the gauge of the guide rail, so the traveling wheel moves in the direction of the gauge of the crane girder. Is not restrained and does not come off.

In order to improve the traveling force of the mobile crane, all of the traveling wheels traveling on one guide rail can be driven by the driving means.

Further, by providing a lower roller which abuts against the bottom surface of the guide rail, the lifting of the running wheel caused by an uneven load acting on the hoist supported by the crane girder is prevented, and the running wheel is prevented from coming off. be able to.

[0017]

1 and 2 show a first embodiment of a mobile crane K according to the present invention.

The mobile crane K is provided with a traveling unit R and a follow-up unit T which travel on a guide rail 10 as a track and suspend a crane girder 13 .
This traveling unit R includes two following traveling wheels 12 and 2
Driving wheels 14 and the following unit T
Four tracking wheels 12 are provided.

The guide rail 10 is made of an H-beam or an I-beam, and is arranged on the inner wall or the outer wall of the building 112 with a predetermined gauge L (see FIG. 9).

As shown in FIGS. 1 and 2, the upper surface of the flange portion 10A of the guide rail 10 is a traveling path on which the following traveling wheel 12 and the driving traveling wheel 14 travel. A tapered portion is provided in the vicinity of the distal end portions of the following traveling wheel 12 and the driving traveling wheel 14 so as to be able to be mounted on the inclined surface of the upper surface of the flange portion 10A of the flange portion 10. The follow-up running wheel 12 is rotatably supported via a bearing (not shown) attached to a shaft 15 fixed to a vertical plate 16. On the other hand, the driving wheel 14 is also rotatably supported via a bearing attached to a shaft (not shown) fixed to the vertical plate 16. A large gear 18 is provided between the driving wheel 14 and a vertical plate 16 that supports the driving wheel 14. The large gear 18 is fixed to a rotating shaft of a motor 20 fixed to the vertical plate 16. The driving gear 14 is provided with a rotational force by meshing with the small gear 22. In the mobile crane K according to the present embodiment, two sets of traveling units R each comprising a following traveling wheel 12 and a driving traveling wheel 14 are provided on one guide rail 10, and each traveling unit R comprises a following traveling wheel 12. One set of the following units T is installed on the other guide rail 10 at a position where the distance between the pair of traveling units R and the pair of traveling units R is substantially the same (see FIG. 3).

As shown in FIGS. 2 and 3, a longitudinal guide roller 2 supported by a shaft 26 fixed to a bracket 24 is provided at both longitudinal ends of each vertical plate 16.
8 are provided. The lateral guide rollers 28 come into contact with both side surfaces 10B of the flange portion of the guide rail 10 and guide the traveling unit R and the following unit T along the guide rail 10. Further, as shown in FIG. 3, a bracket 30 is provided below the bracket 24 on the vertical plate 16, and a lower guide abutting the bottom surface of the flange portion of the guide rail 10 by a shaft 32 provided on the bracket 30. The roller 34 is supported. The lower guide roller 34 prevents the traveling crane K according to the present embodiment from being subjected to an abnormal eccentric load, thereby preventing the driving traveling wheel 14 and the following traveling wheel 12 from floating. It is not always necessary to provide it in the use state of the type crane K.

As shown in FIG.
A side portion of a U-shaped steel 36 having a U-shaped cross section connecting between the vertical plates 16 is fixed to the lower end of the U-shaped steel. A cylindrical bearing 38 is attached to the center of the U-shaped steel 36. The bearing 38 has shaft holes 4 having different hole diameters.
0 and 41 are formed coaxially. These shaft holes 40, 4
1 is provided with a turning device M for rotatably holding the stepped shaft 44. The turning device M includes a radial bearing 46 mounted on the shaft hole 40 and a thrust bearing 48 mounted on the shaft hole 41. The stepped shaft 44 is inserted into the radial bearing 46 and the thrust bearing 48. Thus, the thrust bearing 48 rotatably supports the vertical downward load such as the weight of the movable crane K and the suspended load acting on the stepped shaft 44, and the radial bearing 46 supports the stepped shaft 4.
4 supports the bending force acting around the axis. The upper end of the stepped shaft 44 is threaded, is fixed to the bearing 38 by a nut 50, and the lower end is fixed to a connecting member 42 connected to the crane girder 13.
Reinforcing ribs 54 (FIG. 1)
Reference).

On the other hand, at the lower end of the stepped shaft 44 on the right side of FIG. 1, there is provided a follower device P that enables the crane girder 13 to move in the direction (arrow A direction) perpendicular to the moving direction of the mobile crane K. Installed. The tracking device P includes a box-shaped steel member 56 fixed to the stepped shaft 44 and a pair of arms 5.
8 and a support member 60 that is swingably supported by the arm 58. As shown in FIG.
The arm 58 is a rectangular plate, and is pivotally supported on the wall portion 56A and the support member 60 via shaft members 66 and 68, respectively.

The support member 60 is box-shaped,
It is fixed on both sides. The square steel 70 is bridged along the moving direction of the mobile crane K near the both ends of the crane girder 13 composed of a pair of H-shaped steels arranged orthogonally to the moving direction of the mobile crane K. Is fixed. A connecting member 42 is fixed to a connecting portion between the crane girder 13 and the square steel 70 (see FIG. 3).

As shown in FIG. 2, the crane girder 13
Rollers 73 are suspended from both sides of the flange portion, and movably support the hoist 74. This roller 73
Is provided with a rotating force by a motor 78 so that it can traverse in the direction of arrow A. A pair of crane girder 1
A pair of housings 76 each supporting a roller 73 mounted on the third member 3 are provided with a horizontal member 8 spanned in parallel with the square steel 70.
The rollers 73 connected to each other at 0 and arranged opposite to each other are integrally traversed. A wire 82 is wound around the hoist 74, and a hook 84 is attached to a lower end of the hoist 74 to lift and lower heavy objects (see FIG. 1).

Next, the mobile crane K according to the first embodiment.
The operation of will be described. In FIG.
Is applied, the small gear 22 fixed to the rotating shaft of the motor 20 rotates. Thereby, the small gear 22
The rotational force is transmitted to the large gear 18 that meshes with the driving wheel 14, the driving traveling wheel 14 rotates, and the following traveling wheel 12 also follows, so that the traveling unit R moves along the guide rail 10. In addition, since the following unit T is also integrated with the traveling unit R by the crane girder 13, it follows the traveling. Here, since the following traveling wheels 12 provided in the following unit T do not generate a driving force and travel while being pulled by the traveling unit R, when traveling on a curve,
It is not necessary to adjust the traveling speed of the traveling unit R traveling on the inner guide rail 10 and the following unit T traveling on the outer guide rail 10 shown in FIG.

When the curvature of the guide rail 10 changes, the lateral guide rollers 28 in contact with the side surfaces of both ends of the flange portion 10B of the guide rail 10 move along with the change in the curvature of the guide rail 10. It moves while hitting the inner and outer circumferences. At this time, the traveling unit R and the following unit T can be rotated relative to the crane girder 13 by the turning device M. Therefore, the traveling unit R and the following unit T are not restricted by the crane girder 13 and rotate in the tangential direction of the guide rail 10 while being guided by the lateral guide rollers 28. For this reason, it is possible to continuously travel even on a track on which the curvature changes (see FIG. 9).

Here, as shown in FIG. 5, even if the track distance L (see FIG. 2) fluctuates due to the installation error of the guide rail 10, the follower P moves in the direction orthogonal to the moving direction of the mobile crane K. Since it swings in the (gauge direction), the following unit T can also follow the fluctuation of the gauge L. In addition. The two-dot chain line shown in FIG. 5 shows the swing state.

Next, when the mobile crane K arrives at the target unloading position, the roller 73 is rotated by the motor 78, and the hoist 74 is traversed on the crane girder 13 for fine adjustment. Thus, the guide rail 10 is
With this arrangement, the hoist 74 can also be moved in a direction orthogonal to the moving direction of the mobile crane K. Finally, the wire 82 is unwound from the hoist 74 and slung on the hook 84 to wind up the load.

In the mobile crane K of the first embodiment, since the driving wheels 14 can be directly driven, a chain for transmitting the driving force is separately provided between the two guide rails 10. Mobile crane K by traction
The number of parts can be reduced, and the noise during movement is extremely small as compared with running the vehicle.

Next, a second embodiment will be described. Second
In the embodiment, as shown in FIG.
A rotational force is applied to the driving running wheels 14 on both sides facing each other with the.

The distal end of the driving wheel 14 has a tapered portion as in the first embodiment, and can be mounted on the inclined surface of the upper surface of the flange portion 10A of the guide rail 10. The driving wheels 14 are rotatably supported by bearings 88 attached to a shaft 86 fixed to the vertical plate 16. This drive running wheel 14
A gear 18 is provided on the side of the plate 16. An intermediate gear 94 rotatably supported by a bearing 92 mounted on a shaft 90 fixed to the plate 16 meshes with the large gear 18. A small gear 98 fixed to a rotating shaft 96 of the motor 20 attached to the plate 16 meshes with the middle gear 94. In this way, a large rotational force can be applied to the driving wheels 14 by decelerating.

Next, the operation of the second embodiment will be described. As shown in FIG. 6, in the second embodiment, the small gear 98 rotated by the motor 20 transmits the torque to the large gear 18 via the middle gear 94 meshing with the small gear 98, and the small gear 98 rotates on both sides of the guide rail 10. Is rotated.

By driving the driving wheels 14 on both sides as described above, a larger running force can be obtained as compared with the first embodiment.

Next, a third embodiment will be described. Third
In the embodiment, as shown in FIG. 7, a modified example of the tracking device P for eliminating the fluctuation of the gauge L is shown. The lower end of the stepped shaft 44 of the turning device (not shown) is fixed to the support member 100. A shaft hole 102 is provided on a side surface of the support member 100.
(See FIG. 8), and the shaft member 104 is inserted. A roller 106 is rotatably attached to the shaft member 104. The roller 106 supports a lower surface 108A of a horizontal portion of a gate-shaped suspension member 108 whose lower end is connected to a projecting portion 70A projecting from the square steel 70 in the rail direction.

Next, the operation of the third embodiment will be described. Similarly to the tracking device P shown in the first embodiment, when the gauge L is reduced due to an installation error of the guide rail 10, the tracking unit T tends to move in the direction of arrow C. At this time, the support member 100 is a suspension member 1 that supports the square steel 70.
08 is slidable by the roller 106 supporting the lower surface 108A of the horizontal portion, so that the support member 100 slides in the direction of arrow C to eliminate the error in the gauge L (follows the position shown by the dashed line in FIG. 7). The device P moves). In the opposite case, that is, when the span width becomes large, the slide in the direction opposite to the arrow C direction is eliminated to eliminate the error between the gauges.

[0037]

As described above, the mobile crane according to the present invention can continuously travel on a curved track with a changing curvature, so that the working range of the mobile crane increases, Efficiency is improved.

Further, even if the distance between the rails of the guide rail is slightly changed, the guide rail can be followed in accordance therewith, so that the work of laying the guide rail does not require much accuracy.

Further, since the running wheels are directly driven, the number of members can be reduced and noise can be reduced as compared with the case where a chain or the like for towing is separately provided.

[Brief description of the drawings]

FIG. 1 is a side view of a mobile crane according to a first embodiment as viewed from a moving direction of the mobile crane.

FIG. 2 is a plan view of the mobile crane according to the first embodiment.

FIG. 3 is a perspective view of the mobile crane according to the first embodiment.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, showing the swiveling device of the mobile crane according to the first embodiment.

FIG. 5 is a side view showing a follower of the mobile crane according to the first embodiment.

FIG. 6 is a sectional view showing a driving device for traveling wheels of a mobile crane according to a second embodiment.

FIG. 7 is a perspective view showing a tracking device of a mobile crane according to a third embodiment.

FIG. 8 is a side view showing a follower of a mobile crane according to a third embodiment.

FIG. 9 is a plan view showing a state in which the mobile crane according to the present invention is arranged at a building construction site.

FIG. 10 is a side view showing a state where a conventional mobile crane is arranged at a building construction site.

FIG. 11 is a plan view showing a state in which a conventional mobile crane is arranged at a building construction site.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Following running wheel (running wheel) 14 Driving running wheel (running wheel) 16 Plate 18 Large gear (drive means) 20 Motor (drive means) 22 Small gear (drive means) 28 Horizontal guide roller (horizontal roller) 34 Below Guide roller (lower roller) 44 Stepped shaft (slewing device) 46 Radial bearing (slewing device) 48 Thrust bearing (slewing device) 58 Arm (following device) 94 Medium gear (drive means) 98 Small gear (drive means) 106 Roller (Follow-up device)

Claims (5)

(57) [Scope of request for utility model registration] 1. A mobile crane traveling on two guide rails, comprising: a traveling wheel traveling following a change in curvature of a traveling path formed by the guide rail; and at least one of the traveling wheels. A driving means for driving, a plate supporting the traveling wheel, a lateral roller supported by the plate and abutting against a side surface of the guide rail, and a connecting portion of a crane girder supporting the plate and a hoist for unloading. A swing device that is provided to rotatably support the crane girder, and a follower device that is provided at a connection portion between the swing device and the crane girder and that supports the crane garter so as to swing in a direction between the guide rails. A mobile crane comprising: 2. The mobile crane according to claim 1, wherein said driving means simultaneously drives all traveling wheels traveling on one guide rail. 3. The tracking device according to claim 1, further comprising an arm provided at a connecting portion between the turning device and the crane girder, the arm supporting the crane girder so as to be swingable in a direction between the guide rails. Mobile crane as described. 4. The tracking device supports a crane girder.
And a suspension member attached to the turning device.
A supporting member provided with a roller for supporting the rider.
The mobile crane according to claim 1 or 2, wherein the mobile crane is formed. 5. The mobile crane according to claim 1, further comprising a derailing prevention mechanism comprising a lower roller pivotally supported by the plate and abutting against a bottom surface of the guide rail.