JP2010202357A - Overhead crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance safety and work efficiency of work using an overhead crane. <P>SOLUTION: In the overhead crane (1), traveling trolleys (4) are arranged on a pair of traveling rails (3, 3) arranged on a ceiling (2) respectively and a girder (5) is arranged between the traveling trolleys (4, 4). The girder (5) is hangingly provided on the respective traveling trolleys (4) through an adjustment device (6) for making a crane span follow the width of a rail span. Further, the adjustment device (6) rotatably connects a link (24) to the traveling trolley (4) through a first rotation shaft (25) while directed in a span direction of the girder (5) and rotatably connects the girder (5) to the link (24) through a second rotation shaft (27) while directed in the span direction of the girder (5). Further, in the adjustment device (6), a side roller (29) abutted on an inner side of the traveling rail (3) is arranged on the girder (5). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an overhead crane in which traveling trolleys are respectively disposed on a pair of traveling rails disposed on a ceiling and a girder is disposed between the traveling trolleys.

  Conventionally, overhead cranes are used to suspend and transport heavy objects inside structures such as factories and ships.

  This overhead crane has a configuration in which a pair of traveling rails are attached in parallel to the ceiling, a traveling trolley is provided on each traveling rail so that the traveling trolley can travel freely, and a girder provided with a hoist is horizontally attached between the pair of traveling trolleys. It is known (for example, refer to Patent Document 1).

JP 2007-186330 A

  However, in a structure to which an overhead crane is attached, the ceiling may be bent and deformed due to long-term use or the like.

  Therefore, in the above conventional overhead crane, the rail span of the traveling rail attached to the ceiling (the distance between the pair of traveling rails) is widened and it is difficult to smoothly move the girder along the traveling rail. There was a risk of becoming.

  In particular, in an overhead crane provided on a ship, the width of a rail span is changed between when the ship is empty and when it is fully loaded, and the width of the rail span is often generated, which often impedes the traveling of the girder.

  Therefore, in the present invention according to claim 1, in the overhead crane in which the traveling trolleys are respectively disposed on the pair of traveling rails disposed on the ceiling and the girder is disposed between the traveling trolleys, according to the width of the rail span. It was decided to suspend the girder in each traveling trolley via an adjusting device for following the crane span.

  Further, in the present invention according to claim 2, in the present invention according to claim 1, the adjusting device is configured to connect the link to the traveling trolley so as to be rotatable in the span direction of the girder via the first rotation shaft. In addition, the girder is connected to the link so as to be rotatable in the span direction of the girder via the second rotation shaft.

  Further, in the present invention according to claim 3, in the present invention according to claim 1 or 2, the adjusting device is arranged such that the side roller that contacts the inside of the traveling rail is disposed on the girder.

  And in this invention, there exists an effect described below.

  That is, in the present invention, in an overhead crane in which a traveling trolley is disposed on each of a pair of traveling rails disposed on the ceiling and a girder is disposed between the traveling trolleys, the crane span is tracked according to the width of the rail span. Since the girder is suspended from each traveling trolley via an adjusting device for adjusting the rail span of the traveling rail to which the overhead crane is attached (the interval between the pair of traveling rails), the rail span is adjusted by the adjusting device. Since the crane span (the distance between the pair of travel trolleys) can be adjusted by absorbing the width of the girder, the girder can travel smoothly along the travel rail.

  In particular, as an adjusting device, the link is connected to the traveling trolley via the first rotation shaft so as to be rotatable in the span direction of the girder, and the girder is connected to the link via the second rotation shaft in the span direction of the girder. By adopting a structure that is connected to be freely rotatable, the degree of freedom during adjustment is increased, the distance between the traveling trolleys can be adjusted reliably, and the girder can be smoothly traveled along the traveling rail.

  Also, as the adjusting device, the side rollers that contact the inside of the running rail are arranged on the girder, so that the girder can be prevented from rolling and the girder runs smoothly along the running rail. Can do.

The front view which shows the overhead crane which concerns on this invention. The enlarged side view. The enlarged front view. FIG.

  Below, the specific structure of the overhead crane which concerns on this invention is demonstrated, referring drawings.

  As shown in FIGS. 1 to 3, the overhead crane 1 is attached to a ceiling 2 of a structure such as a factory or a ship with a pair of left and right I-shaped traveling rails 3 and 3 at a predetermined interval (rail span). The two traveling trolleys 4, 4 capable of traveling independently are attached to each traveling rail 3 so as to be able to travel with a space in the front-rear direction, and a girder 5 is suspended from each traveling trolley 4 via an adjusting device 6. In the figure, 7 is a hoist provided on the girder 5.

  The specific structure of the traveling rail 3, the traveling trolley 4, the girder 5, and the adjusting device 6 constituting the overhead crane 1 will be described below.

  First, the structure of the traveling rail 3 will be described. In the traveling rail 3, the abdomen 9 is formed vertically downward at the bottom 8 attached to the ceiling 2, the head 10 is formed at the lower end of the abdomen 9, Support surfaces 11 and 11 are formed on the left and right upper surfaces, and a rack 12 is formed at the center of the lower surface of the head 10.

  Next, the structure of the traveling trolley 4 will be described. The traveling trolley 4 rolls along the support surface 11 of the traveling rail 3 inside the pair of left and right rectangular plate-like bodies 13 and 13 with the traveling rail 3 interposed therebetween. A roller 14 is pivotally supported with a gap in the front-rear direction, and the main bodies 13 and 13 are suspended from the running rail 3 by the roller 14.

  In addition, the traveling trolley 4 rotatably supports the drive shaft 15 between the main bodies 13 and 13, attaches a pinion 16 that meshes with the rack 12 of the traveling rail 3 to the center of the drive shaft 15, and has an outer main body. A drive motor 17 and a transmission 18 are attached to 13, and the drive shaft 15 and the drive motor 17 are interlocked and connected via the transmission 18.

  As a result, the traveling trolley 4 drives the drive motor 17 so that the pinion 16 rotates and moves along the rack 12 and can travel along the traveling rail 3.

  Next, the structure of the girder 5 will be described. The girder 5 is horizontally extended horizontally with a connecting part 19 that is connected horizontally to the traveling trolley 4 via the adjusting device 6 and a hoist 7 that is movably attached. The bottom part of the inner part as a whole is raised upward by forming the main body part 20 and the bottom upper part 21 extended vertically in the left and right ends of the main body part 20 connected to the left and right connection parts 19. The shape is made to be.

  In this way, the girder 5 has a shape in which the bottom surface of the inner part is raised upward, thereby increasing the height of the work area in the inner part and forming the connection part 19 extended to the left and right. Thus, a gap is formed between the main body portion 20 and the traveling trolley 4 to widen the adjustable range by the adjusting device 6.

  Next, the structure of the adjusting device 6 will be described. In the adjusting device 6, the support shaft 22 is horizontally attached to the center of the lower ends of the main bodies 13 and 13 of the traveling trolley 4, and the base end portion (the upper end of the bracket 23 is attached to the support shaft 22). Part) is attached to the front end of the bracket 23 (lower end), and the base end (upper end) of the plate-like link 24 is spanned through the first rotating shaft 25 in the span direction (extension direction). Further, the bracket 24 formed on the outside of the connecting portion 19 of the girder 5 is attached to the end portion (lower end portion) of the link 24 via the second rotating shaft 27 so as to span the girder 5. It is attached so that it can rotate left and right in the direction (extension direction).

  Further, the adjusting device 6 attaches the base end portion of the support body 28 to the outside of the main body portion 20 of the girder 5, supports the side roller 29 horizontally at the tip end portion of the support body 28, and The surface is brought into contact with the inner side surface of the head 10 of the traveling rail 3.

  As shown in FIG. 3, in the adjusting device 6, when the rail span is not wide or narrow, the side roller 29 comes into contact with the inside of the head 10 of the traveling rail 3 that hangs vertically downward from the ceiling 2. At the same time, the bracket 23 and the link 24 are also suspended vertically downward to hold the girder 5 horizontally.

  On the other hand, as shown in FIG. 4, when the rail span is wide or narrow, the adjusting device 6 tilts the traveling rail 3 according to the bending deformation, and the distance between the left and right traveling trolleys 4 and 4 (crane span). However, the side roller 29 comes into contact with the inner side of the head 10 of the inclined traveling rail 3 and the bracket 23 and the link 24 are moved in the first and second directions by the action of the rail span and the gravity of the girder 5. The girder 5 is held horizontally while adjusting the distance between the left and right traveling trolleys 4 and 4.

  In this manner, the adjusting device 6 can adjust the distance between the traveling trolleys 4 and 4 by changing the angle of the link 24 so that the crane span follows the rail span.

  As described above, in the overhead crane 1 as described above, a pair of traveling rails 3 and 3 are disposed on the ceiling 2 and a traveling trolley 4 is disposed on each traveling rail 3 so as to be freely traveled. The girder 5 is arranged between the traveling trolleys 4 and 4.

  Moreover, the overhead crane 1 has a configuration in which the girder 5 is suspended from each traveling trolley 4 via an adjusting device 6 for causing the crane span to follow in accordance with the width of the rail span.

  Therefore, in the overhead crane 1 having the above configuration, even if the rail span between the traveling rails 3 and 3 is wide and narrow, the adjustment device 6 absorbs the width of the rail span and adjusts the distance between the traveling trolleys 4 and 4 (crane span). Therefore, the girder 5 can be smoothly moved along the traveling rail 3, and the safety and workability of the work using the overhead crane 1 can be improved.

  In the overhead crane 1, as the adjusting device 6, the link 24 is connected to the traveling trolley 4 via the first rotating shaft 25 so as to be rotatable in the span direction of the girder 5, and the girder 5 is connected to the link 24. A structure in which the girder 5 is rotatably connected to the span direction of the girder 5 via the second rotation shaft 27 is employed.

  Therefore, in the overhead crane 1 having the above-described structure, the degree of freedom during adjustment by the adjusting device 6 is increased, the distance between the traveling trolleys 4 and 4 can be reliably adjusted, and the girder 5 can be smoothly moved along the traveling rail 3. Can be moved.

  Further, in the overhead crane 1, the adjustment device 6 has a structure in which the side rollers 29 that contact the inner side of the traveling rail 3 are arranged on the girder 5, so that the side of the girder 5 generated by providing the adjustment device 6 is provided. The shaking can be prevented (restricted), and the girder 5 can be smoothly moved along the traveling rail 3 by this.

1 overhead crane 2 ceiling 3 traveling rail 4 traveling trolley 5 girder 6 adjusting device 7 hoist 8 bottom 9 abdomen 10 head
11 Support surface 12 Rack
13 Body 14 Roller
15 Drive shaft 16 Pinion
17 Drive motor 18 Transmission
19 Connection 20 Main unit
21 Bottom top 22 Support shaft
23 Bracket 24 link
25 First axis of rotation 26 Bracket
27 Second rotating shaft 28 Support
29 Side roller

Claims (3)

In an overhead crane in which a traveling trolley is disposed on each of a pair of traveling rails disposed on the ceiling, and a girder is disposed between the traveling trolleys,
An overhead crane in which a girder is suspended from each traveling trolley via an adjustment device for causing the crane span to follow the rail span.   The adjusting device connects the link to the traveling trolley so as to be rotatable in the span direction of the girder via the first rotation shaft, and directs the girder to the link in the span direction of the girder via the second rotation shaft. The overhead crane according to claim 1, wherein the overhead crane is rotatably connected.   The overhead crane according to claim 1 or 2, wherein the adjusting device includes a girder provided with side rollers that contact the inside of the traveling rail.

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