JP2013056741A - Ceiling crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling crane capable of easily pivoting a suspended load, even in the ceiling crane for suspending the suspended load using a plurality of hoists and a suspension tool.SOLUTION: This ceiling crane comprises: a girder 3; travel rails 2, 2 on which the girder 3 travels via a girder traveling part 30; and a trolley 4 laterally moving along the girder 3. The trolley 4 is provided with a rotating body 5 via a pivot bearing 41. The rotating body 5 is provided with a plurality of hoists 6 so that a rotation center axis 41a of the pivot bearing 41 becomes the center of symmetry. The rotating body 5 is pivoted by rotating and driving a pinion 51 of a pivot driving mechanism 50 of the rotating body 5 meshed with a gear 42 formed on a circumferential surface of the pivot bearing 41.

Description

The present invention relates to an overhead crane, and more particularly to an overhead crane capable of turning a suspended load without depending on an operator's manual work.

In general, an overhead crane installed in a structure such as a factory is used to suspend and transport a suspended load in the structure, and the girder and the girder travel through a girder traveling unit at a predetermined interval. (Span) is provided in the structure with a traveling rail and a trolley that traverses along the girder. The suspended load is suspended and conveyed by the tool (for example, Patent Documents 1 and 2).
reference. ).

By the way, when it is necessary to change the direction of the suspended load when the overhead crane is suspended from a predetermined position and moved to the transport destination to land the suspended load, the operator usually suspends it manually. The suspended load in a lowered state is turned (turned) to adjust its direction so as to be landed.

At this time, when the suspended load is heavy, using a plurality of hoists, and hanging the suspended load by attaching a lifting tool to multiple locations of the suspended load, the suspended load is swung manually by the operator. The range that can be made is very small, and the wire rope that disposes the hanging tool at the tip is twisted, and there is a problem that the work is dangerous.

JP 2000-109284 A JP 2008-030895 A

In view of the problems of the above-described conventional overhead crane, the present invention provides an overhead crane that can easily swing a suspended load even if it is an overhead crane that suspends a suspended load using a plurality of hoists and suspension tools. The purpose is to provide.

In order to achieve the above object, an overhead crane according to the present invention is an overhead crane including a girder, a traveling rail on which the girder travels through a girder traveling unit, and a trolley that traverses along the girder. A rotating body is disposed via a slewing bearing, and a plurality of hoists are disposed on the rotating body so that the rotation center axis of the slewing bearing is a symmetric center. It is characterized in that it is made to turn by rotationally driving a pinion of a turning drive mechanism of a rotating body that meshes with a gear formed on the surface.

In this case, a common suspension stand can be suspended from the plurality of hoists.

According to the overhead crane of the present invention, the rotating body is disposed on the trolley via the swivel bearing, and a plurality of hoists are disposed on the rotating body so that the rotation center axis of the swivel bearing is a symmetric center. Because the rotating body is rotated by rotationally driving the pinion of the rotating drive mechanism of the rotating body that meshes with the gear formed on the peripheral surface of the rotating bearing,
By rotating a rotating body equipped with multiple hoists using a swivel drive mechanism, the suspended load is moved manually to the transport destination and the direction of the suspended load is manually adjusted by the operator. Regardless of
It can be easily changed in any direction.
Moreover, since the rotary body which arrange | positions a hoist turns, the wire which suspends a suspended load is not twisted, and a suspended load can be rotated safely.

In addition, by suspending a common suspension platform for the plurality of hoists, the horizontal position of the plurality of suspension devices has a certain height by lifting and lowering the suspension platform with a hoist. Can be maintained, and the suspended load can be suspended in a balanced manner.

It is a partially cutaway front view showing a first embodiment of the overhead crane of the present invention. The trolley of the overhead crane is shown, (a) is a partially cutaway front view, and (b) is a partially cutaway plan view. The modification which changed the arrangement | positioning position of the rotary body of the same overhead crane is shown, (a) is a partially cutaway front view, (b) is a partially cutaway plan view. The 2nd Example of the overhead crane of this invention is shown, (a) is a partially cutaway front view, (b) is a partially cutaway plan view. It is a front view which shows the trolley of the overhead crane.

  Hereinafter, an embodiment of an overhead crane according to the present invention will be described with reference to the drawings.

1 to 3 show a first embodiment of an overhead crane according to the present invention.
The overhead crane 1 </ b> A includes a girder 3, traveling rails 2 and 2 on which the girder 3 travels via a girder traveling unit 30, and a trolley 4 that traverses along the girder 3. The rotating body 5 is disposed, and a plurality of hoists 6 are disposed on the rotating body 5 so that the rotation center axis 41 a of the rotating bearing 41 is a symmetric center. The pinion 51 of the turning drive mechanism 50 of the rotating body 5 that meshes with the gear 42 formed on the surface is rotated by being driven to rotate.

The girder 3 is a pair of traveling rails 2 and 2 that are arranged in parallel in the structure with a predetermined interval (span) (in this embodiment, they are laid near the ceiling). The girder travel unit 30 is provided with a drive unit that is rotated by a drive mechanism provided at both ends and travels on the travel rails 2 and 2, and travels along the girder 3 (direction orthogonal to the travel rails 2 and 2. ) And the traverse rail 31 of the trolley 4.
Usually, the girder 3 is made of steel I or H so that the trolley 4 can traverse smoothly.
Two traversing rails 31 made of die steel (I steel in this embodiment) are provided in parallel, and the ends are fixed to the girder traveling part 30 so as to keep the distance between the traverse rails 31 constant. Yes.

As shown in FIG. 2, the trolley 4 is rotated by a drive mechanism, and the trolley main body is provided with drive wheels 43 that travel (transverse) with the upper surface of the lower flanges 31 of the I-shaped steel as the rail surface. 40 and a pedestal for attaching the swivel bearing 41 to the central portion of the trolley main body 40.
The drive wheels 43 are configured such that a plurality of pairs of drive wheels 43 travel with respect to one traverse rail 31. However, the drive wheels 43 driven by the drive mechanism are configured in this embodiment. There is only one set of drive wheels 43.

The rotating body 5 connects a plurality of H-shaped steel main members 52 (in this example, five) bent at some intervals by connecting members 53 made of H-shaped steel at intervals, A hoist 6 is disposed on the end of the outer main member 52 (total of four places in this embodiment) via a hoist attachment member, and a base for attaching the swivel bearing 41 to the center is provided.
The main member 52 and the connecting member 53 are formed from the upper surface toward the upper side.
This pedestal is paired with a pedestal formed downward from the lower surface of the trolley body 40, and the rotating body 5 is configured to be positioned below the traverse rail 31.

The slewing bearing 41 is a member for rotating the rotating body 5 relative to the trolley body 40. In this embodiment, the inner ring portion is attached to the trolley body 40 and the outer ring portion is attached to the rotating body 5. I am doing so.
Further, on the outer peripheral surface of the outer ring portion of the slewing bearing 41, the rotating body 5 disposed in the trolley body 40
A gear 42 that meshes with a pinion 51 attached to the drive shaft of the turning drive mechanism 50 is formed, and the turning of the turning drive mechanism 50 is transmitted to the rotating body 5 via the turning bearing 41 to turn the rotating body 5. I am doing so.
The turning drive mechanism 50 uses, for example, a speed reducer that can perform low-speed rotation (for example, about 1 rpm) and that can be controlled by an inverter.

The hoist 6 disposed in the rotating body 5 is a device that winds a wire rope having a hook 61 or the like attached to the tip of the hoist 6 and lifts and lowers a suspended load that is locked to the hook 61. 1
An inverter motor capable of winding a wire rope at a speed of ˜20 m / min is used.

An overhead crane 1B shown in FIG. 3 is a modified example in which the arrangement position of the rotating body 5 is changed, and a pedestal for mounting the slewing bearing 41 is provided on the upper surface of the trolley body 40, and the slewing bearing 41 is provided on this pedestal. The outer ring portion is attached to the inner ring portion of the slewing bearing 41, and the disk-shaped rotating body 5 is attached to the inner ring portion.
In this case, in this embodiment, the hoist 6 is connected to the rotation center axis 41 of the slewing bearing 41.
Two units are arranged so that a is the center of symmetry.
This overhead crane 1B has a space between the girder 3 and the ceiling surface, so that an operator can walk on the girder 3 and inspect the girder 3, the trolley 4, the hoist 6, etc. Can be suitably used in the case of an overhead crane.

Next, a description will be given of a procedure for using the overhead cranes 1A and 1B to suspend a suspended load from a predetermined position, move it to a transport destination, and change the direction of the suspended load when landing.

First, the girder 3 is moved to the traveling rails 2 and 2 and the trolley 4 is moved along the transverse rails 31 and 31 of the girder 3 so that the trolley 4 is positioned directly above the suspended load.
Next, a plurality of hoists 6 (four or two in the present embodiment) are operated to lower the hanging tool 61 and engage with annular hooks attached to four or two corners of the suspended load. After stopping, the suspended load is raised to a predetermined height.

The suspended load suspended at a predetermined height is moved along the traveling rails 2 and 2 and the trolley 4 along the transverse rails 31 and 31 of the girder 3 to the transport destination.

Then, the swivel drive mechanism 50 is operated while lowering the suspended load at the transfer destination mounting place, and the rotating body 5 is rotated to change the direction of the suspended load to a desired direction, thereby conveying the suspended load. Let it land first.
As a result, even if there is a restriction on the direction of the truck that can enter the factory, even a large and heavy load (especially a rectangular load in plan view) can be placed smoothly on the truck bed. be able to.

4 to 5 show a second embodiment of the overhead crane of the present invention.
As with the first embodiment, the overhead crane 1C includes a girder 3, traveling rails 2 and 2 on which the girder 3 travels through the girder traveling unit 30, and a trolley 4 that traverses along the girder 3. The rotating body 5 is disposed on the trolley 4 via the swivel bearing 41, and a plurality of hoists 6 are disposed on the rotating body 5 so that the rotation center axis 41a of the swivel bearing 41 is a symmetrical center. The body 5 is swung by rotationally driving the pinion 51 of the swivel drive mechanism 50 of the rotating body 5 that meshes with the gear 42 formed on the peripheral surface of the swivel bearing 41, and a common suspension for the plurality of hoists 6. The equipment table 7 is suspended.

At this time, the first suspension 61A having a load resistance equal to or greater than the total rated load of the plurality of hoists 6 is disposed at the position of the rotation center shaft 41a of the slewing bearing 41 on the suspension platform 7 suspended from the hoist 6. At the same time, a plurality of second suspension members 61B having the same load resistance that has a total load resistance equal to or greater than the total load rating of the hoist 6 may be disposed at a position where the rotation center axis 41a of the slewing bearing 41 is the center of symmetry. it can.

Thereby, when hanging a suspended load with one wire, the first hanging tool 61A can be used, and when hanging a suspended load with a plurality of wires, the second hanging tool 61B can be used. Hanging hanger 6
1 can be used easily.

Moreover, the relationship between the load rating of the hoist 6 and the load resistance of the first hoisting device 61A and the second hoisting device 61B is, for example, when the load rating of the two hoists 6 is 4t and the total load load is 8t,
The first hanger 61A is a hanger with a load resistance of 8t, and the second hanger 61B is a hanger with a load capacity of 4t.
Thereby, it is possible to use a hanging tool with no waste with respect to the total load rating of the hoist 6, and it is possible to prevent over-spec in selecting the hanging tool.

The suspension stand 7 is suspended from a plurality of hoists 6, in this embodiment, two hoists 6, and the rotation center axis 41a of the swivel bearing 41 passes through the suspension stand 7 (substantially). The first suspension 61A is disposed at the position of the rotation center axis 41a, and the first suspension 61A is disposed at a position where the rotation center axis 41a is the center of symmetry. 2 If the hanging tool 61B is provided, its shape, size, and the like are not particularly limited, but in this embodiment, a pair of wires on which the hoist 6 is wound on the upper surface is locked. Pulleys 70 and 7
In addition, a steel material such as I-type steel or H-type steel, in which the first hanging tool 61A and the second hanging tool 61B are disposed on the lower surface, is configured in such a manner that 0 is disposed.

Further, the traverse rails 31, 31 in the present embodiment are made of square members laid on the upper surface of the girder 3.
And it is comprised so that the drive wheel 43 arrange | positioned at the trolley 4 may move so that it may roll on the transverse rails 31 and 31, but the structure of a transverse rail and a drive wheel is 1st Example. Similarly, the upper surface of the lower flange of the traversing rails 31, 31 made of I-shaped steel can be used as a rail surface so that the drive wheels 43 can travel on the rail surface.

In addition, the other structure and effect | action of a present Example, and the operating point of an overhead crane are the same as that of the said 1st Example.

As mentioned above, although the overhead crane of the present invention has been described based on a plurality of embodiments, the present invention is not limited to the configurations described in the above embodiments, and the configuration is appropriately changed without departing from the gist thereof. Is something that can be done.

Since the overhead crane of the present invention has a characteristic that the suspended load can be easily swiveled, it is necessary to suspend the suspended load using a plurality of hoists and suspension tools, When doing, it can use suitably for the use of the overhead crane used in the factory etc. which needs to change the direction of a hanging load.

DESCRIPTION OF SYMBOLS 1 Overhead crane 2 Traveling rail 3 Girder 30 Girder traveling part 31 Traverse rail 4 Trolley 41 Turning bearing 41a Rotation center axis 42 Gear 5 Rotating body 50 Turning drive mechanism 51 Pinion 6 Hoist 7 Lifting tool stand

Claims (2)

In an overhead crane comprising a girder, a traveling rail that the girder travels through a girder traveling unit, and a trolley that traverses along the girder, a rotating body is disposed on the trolley via a swivel bearing, A rotating drive mechanism for a rotating body, in which a plurality of hoists are arranged on the rotating body so that the rotation center axis of the rotating bearing is a symmetric center, and the rotating body meshes with a gear formed on the peripheral surface of the rotating bearing. An overhead crane that is made to turn by rotating and driving the pinion. The overhead crane according to claim 1, wherein a common suspension stand is hung on the plurality of hoists.

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