JP2013100178A - Portal crane and method of extending width of portal crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portal crane which enables usage of a portal crane of size matching breadth in a work area even if an assembling area is narrow.SOLUTION: The portal carne 1 is provided, in which a pair of leg parts, and a girder 20 spanning between the pair of the leg parts are provided, the pair of leg parts 10A, 10B is placed on a pair of rails L, respectively, and is able to travel on the pair of rails L, and a suspended member 30 is provided to the girder 20, and which is portal-shaped when viewed from the front. In the girder 20, a slide mechanism is provided which makes at least either of the pair of leg parts 10A, 10B slidable along the girder 20, and the slide mechanism characteristically has a guide rail 21 which guides along the extended direction of the girder 20 while the slide leg part 10A as a slide target is suspended which is at least either of the pair of the leg parts 10A, 10B.

Description

  The present invention relates to a portal crane and a method for widening a portal crane and a crane.

  A portal crane may be used for transporting heavy objects. The portal crane includes a pair of legs that can travel with respect to each of a pair of traveling rails installed on the ground, and a garter that is stretched over the pair of legs. A crane that lifts and transports heavy objects with members and has a portal shape when viewed from the front.

  Conventionally, as such a portal crane, what is shown to the following patent document 1 is known. This portal crane includes a frame-shaped frame, four legs coupled to the frame, a moving means attached to each leg, and a load suspension mechanism provided on the frame. A pair of opposing frame elements are formed to be stretchable. The portal crane switches the traveling direction of the portal crane by reducing the frame in the width direction at the traveling direction switching point.

JP 2000-177799 A

  By the way, since this kind of portal crane is large, it is difficult to transfer it in an assembled state. Therefore, parts such as legs and garters are often used after being transferred to the work site and assembled at the work site. However, depending on the work site, the assembly area where the portal crane is assembled may be narrower than the area where the portal crane is operated. In this case, it is required to assemble a portal crane corresponding to the size of the working area, but the assembling area is narrow and it may be difficult to assemble. In addition, the portal crane disclosed in Patent Document 1 can extend and contract the frame element, but does not take into account the countermeasure when the assembly area is small. Accordingly, there is a problem that it is difficult to assemble a portal crane having a size required for a wide work area in a narrow assembly area.

  Accordingly, an object of the present invention is to provide a portal crane that can use a portal crane having a size corresponding to the size of the work area even when the assembly area is narrow.

  A portal crane according to the present invention includes a pair of leg portions and an upper frame that is spanned between the pair of leg portions, and the pair of leg portions are mounted on the pair of rails, respectively. It is a gate-type crane that is capable of traveling, has a suspension member provided on the upper frame, and has a gate shape when viewed from the front, and slides at least one of a pair of legs along the upper frame. A slide mechanism is provided on the upper frame, and the slide mechanism is at least one of the pair of legs, and the upper frame extends in a state where the slide leg to be slid is suspended. A guide member that guides along the direction is provided.

  Further, the widening method of the portal crane according to the present invention includes a pair of legs and an upper frame that is spanned between the pair of legs, and the pair of legs is between the narrow region and the wide region. Each of the cranes is placed on a pair of rails laid across and can run on the pair of rails, and a suspension member is provided on the upper frame, and the shape of the gate crane having a gate shape is a front view. In the widening method, after assembling the portal crane in a narrow region, the step of moving the portal crane to the wide region along the rail, the step of suspending the leg portion on the slide mechanism disposed on the upper frame, And a step of sliding the portion along the upper frame by a slide mechanism, and a step of grounding the suspended leg portion.

  In the portal crane and the method of widening the portal crane according to the present invention, the upper frame extends in a state where the slide leg to be slid is suspended by the slide mechanism that is slidable along the upper frame. Guided along the direction. According to such a portal crane, the distance between the pair of legs can be changed. For this reason, when an assembly area is narrow, a portal crane can be assembled in a state where the distance between the leg portions is narrow, and in a wide work area, the distance between the leg parts can be widened. For this reason, even when the assembly area is small, a portal crane having a size corresponding to the size of the work area can be used.

  The portal crane according to the present invention may further include a lifting member that temporarily lifts the upper frame when the leg portion is slid.

  Moreover, the widening method of the portal crane according to the present invention may further include a step of lifting the upper frame after moving to a wide area.

  In this case, when the upper frame is lifted, the position of the leg portion is lowered relative to the upper frame, and the slide leg portion can be reliably suspended from the guide member.

  In the portal crane according to the present invention, the slide leg portion has a convex portion protruding in a direction intersecting on the horizontal plane with respect to the extending direction of the upper frame, and the slide mechanism places the convex portion on the guide member. By doing so, the slide leg may be suspended. In this case, when the leg portion is lowered with respect to the guide member, the convex portion is caught by the guide member, so that the guide member can reliably suspend the slide leg portion.

  In the portal crane according to the present invention, a cushioning material may be interposed between the convex portion and the guide member. In this case, since the convex portion and the guide member are not in direct contact, the convex portion and the guide member can be prevented from being damaged.

  According to the portal crane, the portal crane, and the crane widening method according to the present invention, even when the assembly area is small, a portal crane having a size corresponding to the size of the work area can be used. .

(A) is a front view of the portal crane which concerns on this embodiment, (b) is the side view. (A) is an enlarged front view of a guide rail, (b) is an enlarged side view of a guide rail. It is a figure explaining the process of the widening method of the portal crane 1 which concerns on this embodiment. It is a figure explaining the intercepting process of the portal crane 1 which concerns on this embodiment. It is a figure explaining the intercepting process of the portal crane 1 which concerns on this embodiment. It is a perspective view of a weight roller. It is a figure explaining the widening process of the portal crane 1 which concerns on this embodiment. It is a figure explaining the widening process of the portal crane 1 which concerns on this embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted. Further, the dimensional ratios in the drawings do not necessarily match those described.

  Fig.1 (a) is a front view of the portal crane which concerns on this embodiment, FIG.1 (b) is the side view. The portal crane according to the present embodiment moves the position of its leg from the position indicated by the phantom line in FIG. 1A to the position indicated by the solid line, so that the width between the legs of the portal crane 1 is increased. Can be expanded. Hereinafter, the structure of the portal crane 1 which concerns on this embodiment is demonstrated.

  As shown in FIGS. 1A and 1B, the portal crane 1 includes a pair of leg portions 10A and 10B and a garter 20 as an upper frame, and the leg portions 10A and 10B and the garter 20 The viewed shape is formed in a gate shape. Hereinafter, when it is not necessary to particularly distinguish the leg portions 10A and 10A, they are also simply referred to as the leg portions 10.

  The leg portions 10A and 10B are placed on a pair of rails L, respectively. When viewed from the side, the leg 10 includes a frame 11a that is inclined downward and extends obliquely forward and a frame 11b that is inclined downward and extends obliquely rearward. The upper ends of the frames 11 a and 11 b are supported by the garter 20, and the lower ends of the frames 11 a and 11 b are supported by the lower frame 13. A plurality of beams H for improving the strength of the leg portion 10 are connected to an intermediate position in the vertical direction of the frames 11a and 11b. The leg portion 10 has a substantially A shape when viewed from the side by the frames 11 a and 11 b and the beam H.

  Flange portions 12a and 12b, which are convex portions, are provided at the upper ends of the frames 11a and 11b of the leg portion 10, respectively. The flange portions 12 a and 12 b protrude in a direction intersecting on the horizontal plane with respect to the extending direction of the garter 20. The leg portion 10 and the garter 20 are coupled to each other by being fastened with bolts and nuts via the flange portions 12a and 12b. Here, the bolt is preferably long.

  Below the lower frame 13, a telescopic swing mechanism 14, wheels 15, and a wheel cover 16 are provided. The telescopic oscillating mechanism 14 is located at the center thereof, and a pin is inserted in the direction of the axle of the wheel 15. When the lower frame 13 tilts and expands and contracts vertically by rotating about the pin as a fulcrum. In addition, the wheel 15 is prevented from being lifted off the rail. Below the telescopic swing mechanism 14, a wheel 15 is connected via a wheel cover 16. As the wheel 15 is placed on the rail L and rolls, the leg portion 10 is guided on the rail L.

  The garter 20 is installed on the upper portions of the leg portions 10A and 10B in a state of being stretched over the leg portions 10A and 10B. A suspension member 30 is provided on the top of the garter 20. The suspension member 30 includes a motor, a winch, and the like (not shown), and is configured to be movable along the extending direction of the garter 20 by the power of the motor. A hook 30 </ b> A is provided at the lower part of the suspension member 30. The hook 30 </ b> A is configured to be movable up and down by the operation of the winch of the hanging member 30. The portal crane 1 can lift and carry heavy objects by the suspension member 30.

  Guide rails 21a and 21b, which are guide members, are provided at a lower portion on one end side of the garter 20. FIG. 2A is an enlarged front view of the guide rail 21, and FIG. 2B is an enlarged side view of the guide rail 21. The guide rail 21 is long and its direction extends in the width direction of the portal crane 1. The guide rail 21 is provided so as to sandwich the frames 11a and 11b of the leg 10 in a side view. The interval between the inner end portion of the guide rail 21a and the inner end portion of the guide rail 21b is formed to be narrower than the interval between the outer end portion of the flange portion 12a and the outer end portion of the flange portion 12b. Therefore, when the bolts of the flange portions 12a and 12b are removed, the connection between the leg portion 10A and the garter 20 is released, and the flange portion 12 moves downward, the flange portion 12 comes into contact with the guide rail 21 and the leg portion 10 Is supported by the guide rail 21. The flange portion 12 and the guide rail 21 constitute a slide mechanism that allows the leg portion 10 to slide along the garter 20. In the present embodiment, the leg portion 10A, which is the leg portion on the side where the slide mechanism is provided, becomes the slide leg portion to be slid. In addition, although the portal crane 1 which concerns on this embodiment is equipped with the slide mechanism only in the one end side of the portal crane 1, you may equip the both sides of the portal crane 1 with a slide mechanism.

  As shown in FIG. 2B, a buffer material 22 is interposed between the flange portion 12 and the guide rail 21. The cushioning material 22 is made of a material that absorbs an impact such as a resin, and absorbs an impact when the leg 10 </ b> A contacts the guide rail 21. The cushioning material 22 is provided at the lower portion of the flange portion 12, but may be provided at the upper portion of the guide rail 21.

  A gold wheel K is provided at the end of the garter 20. Further, a winder 24 is provided at the upper end of the one end side of the garter 20. The hoist 24 winds up the wire attached to the leg 10A by a winch or the like via the gold wheel K when moving the leg 10A. The gold wheel K changes the winding direction of the wire.

  Next, a method for widening the portal crane 1 according to this embodiment will be described. In the present embodiment, it is assumed that the portal crane 1 is assembled and widened in an area as shown in FIG. FIG. 3 is a plan view of an area in which work is performed, and the area includes a narrow area AA that is an assembly area and a wide area WA that is a work area. That is, after the portal crane 1 is assembled in the narrow area AA, the portal crane 1 is moved to the wide area WA, and the portal crane 1 is widened in the wide area WA. Further, a rail L1 having a distance d1 is provided from the narrow area AA to the wide area WA, and a rail L2 having a distance d2 is provided in the wide area WA, and the distance d1 <the distance d2.

  In the widening method of the portal crane 1 according to the present embodiment, first, the portal crane 1 is assembled at the first position P1 in the narrow area AA shown in FIG. Thereafter, the portal crane 1 is moved from the first position P1 to the second position P2 of the wide area WA along the rail L1. Next, the portal crane 1 is moved from the second position P2 to the third position P3. Here, a step of taking over is performed in which one leg portion of the portal crane 1 is transferred from the rail L1 to the rail L2. Since the portal crane 1 according to the present embodiment is configured such that only one leg is movable with respect to the garter 20, in order to place both legs on the rail L1, the entire portal crane 1 is laterally moved. A preemption process that shifts in the direction is required. In addition, depending on the case where it is set as the structure provided with a slide mechanism on both sides of the portal crane 1, and depending on the shape of a work area | region, this intercepting process may be unnecessary. When a slide mechanism is provided on both sides of the portal crane 1, a widening process, which will be described later, is performed when moving from the second position P2 to the third position P3 instead of the pre-emption process. Hereinafter, with reference to FIGS. 4 to 6, the preparatory process will be specifically described.

  When the portal crane 1 is moved from the narrow area AA to the wide area WA as shown in FIG. 4 (a), as shown in FIG. The steel material over the lower frame 13 of each of 10A and 10B is inserted as a girder B, and the girder B is fixed. Next, the portal crane 1 is lifted by a jack (not shown) disposed below the lower frame 13 of each of the legs 10A and 10B. Thereafter, as shown in FIG. 4C, the weight roller 40 is inserted into the gap between the lower frame 13 and the beam B generated by lifting the portal crane 1.

  FIG. 5 shows a perspective view of the weight roller 40. As shown in FIG. 5, the weight roller 40 is a roller for carrying a heavy object provided with a plurality of rollers R. A plate part 41 provided horizontally with respect to the ground is installed on the upper part of the roller R, and the heavy object placed on the plate part 41 is transported by the rotation of the roller R.

  After the weight roller 40 is inserted, the load of the portal crane 1 is received by the weight roller 40 by jacking down the portal crane 1. Thereafter, as shown in FIG. 6A, the portal crane 1 is moved in the lateral direction by moving the weight roller 40 along the beam B. When the leg portion 10B different from the slide leg portion moves until it is positioned above the rail L2, the lateral movement by the weight roller 40 is finished. Then, as shown in FIG.6 (b), the portal crane 1 is lifted with the jack which is not shown in figure, the weight roller 40 is removed, and a pre-emption process is complete | finished.

  When the pre-emption process is completed, the portal crane 1 is moved from the third position P3 shown in FIG. 3 to the fourth position P4. Here, a widening step is performed. The widening step is a step of placing the leg portions 10A and 10B on the rail L1 by sliding the leg portion 10A, which is a slide leg portion, using a slide mechanism and widening the interval between the leg portions 10A and 10B. With reference to FIGS. 7 and 8, the widening step will be described in detail.

  FIG. 7A shows a state where the portal crane 1 is lifted. First, in the widening step, a vent 50 which is a lifting member for temporarily lifting the garter 20 is installed on the beam B. A jack 51 is provided on the top of the vent 50. The garter 20 is lifted by the jack 51 extending upward. At this time, the legs 10A and 10B joined to the garter 20 also float from the rail L1. FIG. 7A shows a state where the portal crane 1 is lifted as described above. When lifting the garter 20, an auxiliary jack may be interposed between the lower frame 13 and the beam B in order to keep the balance of the portal crane 1.

  When the garter 20 is lifted, next, the bolt fastened to the flange portion 12a of the leg portion 10A is loosened. The leg 10A and the garter 20 are separated by loosening the bolt. When the leg portion 10 and the garter 20 are separated from each other, the leg portion 10A moves downward relative to the garter 20 due to its own weight, and the position of the flange portion 12a transitions downward. When the flange portion 12 a moves to the position of the guide rail 21, the flange portion 12 a is placed on the guide rail 21.

  Next, as shown in FIG. 7B, the leg 10A is slid along the guide rail 21 to the position of the rail L1. In the portal crane 1 of this embodiment, the leg portion 10A is slid to the rail L1 side using the wire W. In this case, one end of the wire W is attached to the upper portion of the leg portion 10 and the other end of the wire W is attached to the hoist 24 via the gold wheel K. When the winch of the winder 24 winds the wire W, the leg portion 10A is slid outward. At this time, in order to prevent the leg portion 10A from tilting in the left-right direction, a wire may be attached to the lower portion of the leg portion 10A and pulled outward using equipment such as a traction machine.

  When the leg portion 10A moves to a position on the rail L1, the jack 51 is contracted, the leg portion 10 and the garter 20 are lowered, and the leg portion 10 is grounded to the rail L1. Then, the bolt of the flange portion 12a of the leg portion 10A is fastened. The leg 10A and the garter 20 are connected by fastening the bolt.

  Thereafter, as shown in FIG. 8A, the jack 51 in the vent 50 is removed. Finally, as shown in FIG. 8B, the vent 50 and the beam B are removed. In this way, the widening process is completed.

  Heretofore, the method for widening the portal crane 1 according to the present embodiment has been described. When the work of the portal crane 1 is completed in the wide area WA, the portal crane 1 can be reduced in width by performing the above-described steps in reverse order. In this case, the portal crane 1 is disassembled in the narrow area AA. However, when it is possible to dismantle in the wide area WA, the portal crane 1 is dismantled in the wide area WA.

  As described above, in the portal crane 1 and the portal crane widening method according to the present embodiment, the slide leg 10 </ b> A to be slid is suspended by the slide mechanism that is slidable along the garter 20. Then, it is guided along the extending direction of the garter 20. According to such a portal crane 1, since the distance between the pair of leg portions 10A and 10B can be changed, the distance between the leg portions 10A and 10B is narrowed in the narrow region AA, and the leg portion 10A in the wide region WA. 10B can be widened. For this reason, even when the assembly area is small, a portal crane having a size corresponding to the size of the work area can be used.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, when the slide leg 10A is moved along the garter 20, the wire W is pulled by the hoist 24, but another crane installed on the side of the portal crane 1 is used. The wire W may be pulled using

DESCRIPTION OF SYMBOLS 1 ... Portal crane, 10A, 10B ... Leg part, 12a, 12b ... Flange part, 13 ... Lower frame, 14 ... Telescopic rocking mechanism, 15 ... Wheel, 16 ... Wheel cover, 20 ... Garter, 21a, 21b ... Guide Rail, 22 ... cushioning material, 24 ... hoist, 30 ... suspension member, 40 ... heavy roller, 50 ... vent, 51 ... jack, K ... gold wheel, W ... wire.

Claims (6)

A pair of leg portions and an upper frame spanned between the pair of leg portions, the pair of leg portions being respectively mounted on the pair of rails and being able to run on the pair of rails. The upper frame is provided with a suspension member, and the shape of the front view is a portal crane,
A slide mechanism is provided on the upper frame that allows at least one of the pair of legs to slide along the upper frame.
The slide mechanism is at least one leg of the pair of legs, and a guide member that guides along the extending direction of the upper frame in a state in which the slide leg to be slid is suspended. A portal crane characterized by comprising. The portal crane according to claim 1, further comprising a lifting member that temporarily lifts the upper frame when sliding the leg portion. The slide leg has a protrusion protruding in a direction intersecting on a horizontal plane with respect to the extending direction of the upper frame;
The portal crane according to any one of claims 1 to 2, wherein the slide mechanism suspends the slide leg by placing the convex portion on the guide member. The portal crane according to claim 3, wherein a cushioning material is interposed between the convex portion and the guide member. A pair of leg portions and an upper frame spanned between the pair of leg portions, and the pair of leg portions are respectively mounted on a pair of rails laid between a narrow region and a wide region. In the method for widening a portal crane in which the upper frame is provided with a suspension member, and the shape in front view forms a portal shape,
After assembling the portal crane in the narrow area, moving the portal crane to the wide area along the rail;
Suspending the legs on a slide mechanism disposed on the upper frame;
Sliding the leg along the upper frame by the slide mechanism;
Grounding the suspended leg, and
A method for widening a portal crane, comprising: The method for widening a portal crane according to claim 5, further comprising a step of lifting the upper frame after moving to the wide area.

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