JP6186221B2 - Crane height change structure and height change method - Google Patents

Description

  The present invention relates to a crane height changing structure and a height changing method.

  Conventionally, a crane is sometimes used for transporting heavy objects. As such a crane, what is shown, for example in patent document 1 is known. The crane includes a pair of column portions that can travel with respect to each of the installed pair of traveling rails, a horizontal beam portion that spans the pair of column portions, and a suspension portion that travels along the horizontal beam portion. It is a gate-type crane that lifts and transports heavy objects with the suspension.

JP 2000-177799 A

  Here, as a crane, in order to be able to lift a member longer than the width of the column parts, the crane has a leg part extending in the front-rear direction, and the column part is connected to one end side of the leg part. In some cases, a crane (so-called L-shaped crane) is used in which the suspended portion is arranged on the other end side of the leg portion from the connection position. Such a crane may be used at a high place, and as a result, an assembling work or a dismantling work may be required at a high place. In such work, work efficiency can be improved by reducing the height of the crane. By lowering the height of the crane, for example, it becomes easier to suspend a crane member when suspending it with another crane or a crane truck, and the work efficiency can be improved. Therefore, it has been required to easily change the height of the crane.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a crane height changing structure and a height changing method capable of easily changing the height of the crane. To do.

  The crane height changing structure according to the present invention includes a pair of column portions extending in the vertical direction, and extending in the front-rear direction and connected to the carriage portion, and one end side in the front-rear direction is connected to the lower end side of the column portion. A pair of leg portions that extend in the width direction and span the upper end portion side of the pair of column portions, and are disposed on the other end side in the front-rear direction of the leg portions, rather than the connecting position of the column portions to the leg portions. The crane includes a lower frame and an upper frame, and the lower frame includes leg portions. The upper frame includes at least a part or all of the pillar portion, a cross beam portion, and a suspension portion, and the lower frame and the upper frame rotate between the lower frame and the upper frame. Connect as possible Rotating unit is provided, the upper frame, drive unit for rotating the upper frame around the rotation unit is connected.

  In the crane height changing structure according to the present invention, the crane includes a lower frame having at least a leg portion, and an upper frame having at least a pillar portion (part or all), a cross beam portion, and a hanging portion. The Further, between the lower frame and the upper frame, there is provided a rotating portion that rotatably connects the lower frame and the upper frame. With such a structure, the crane can be in a folded state in which the upper frame is folded with respect to the lower frame as well as an upright state (a state in use) in which the upper frame is raised. In such a folded state, the height of the crane can be made lower than the standing state that is a state when the crane is in use. The upper frame is connected to a drive unit that rotates the upper frame around the rotation unit. Therefore, by rotating the upper frame around the rotating portion by the drive unit, for example, when assembling the crane, it can be changed from the folded state to the standing state. For example, when the crane is disassembled, the upper frame can be folded from the standing state. State. As described above, the height of the crane can be easily changed by the height changing structure according to the present invention.

  In the crane height changing structure according to the present invention, the drive unit may be constituted by a jack having an upper end connected to the upper frame and a lower end connected to the lower frame. Thus, by comprising a drive part with a jack, the height of a crane can be changed with a simple structure.

  In the crane height changing structure according to the present invention, the upper end of the jack is connected to a position closer to the lateral beam than the rotating portion of the upper frame, and the lower end of the jack is the other end of the rotating portion of the lower frame. It may be connected to the part side. With such a configuration, the upper frame can be rotated with a good balance.

  The crane height changing method according to the present invention includes a pair of column portions extending in the vertical direction, and extending in the front-rear direction and coupled to the carriage unit, and the lower end side of the column unit is coupled to one end side in the front-rear direction. A pair of leg portions extending in the width direction and spanned to the upper end side of the pair of column portions, and closer to the other end portion side of the leg portions in the front-rear direction than the connecting position of the column portions to the leg portions. A crane height changing method comprising: a lateral beam portion to be arranged; and a hanging portion capable of traveling along the transverse beam portion, wherein the crane is constituted by a lower frame and an upper frame, and the lower frame is a leg portion. The upper frame includes at least a part of or all of the pillars, a cross beam portion, and a hanging portion, and the lower frame and the upper frame are rotated between the lower frame and the upper frame. Reamable A rotating part is provided, and the upper frame is turned around the rotating part to change the folded state in which the upper frame is folded with respect to the lower frame to the standing state in which the upper frame stands or the upper frame Is rotated from the standing state to the folded state.

  According to the crane height changing method of the present invention, it is possible to obtain the same operation and effect as the above-described height changing structure.

  According to the present invention, the height of the crane can be easily changed.

It is a perspective view which shows an example of the usage condition of the crane with which the height change structure which concerns on embodiment of this invention was applied. It is a figure which shows the structure of the A type crane shown in FIG. 1 is a side view of an L-shaped crane to which a height changing structure according to an embodiment of the present invention is applied. It is a rear view of the L-shaped crane where the height change structure concerning an embodiment was applied to the present invention. It is a figure which shows the folding state of the L-shaped crane shown in FIG. It is a side view of the L-shaped crane to which the height change structure concerning a modification is applied. It is a figure which shows the folding state of the L-shaped crane shown in FIG. It is a side view of the L-shaped crane to which the height change structure concerning a modification is applied. It is a figure which shows the folding state of the L-shaped crane shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. The terms “upper” and “lower” correspond to the upper and lower parts in the vertical direction, respectively.

  First, with reference to FIG. 1, an example of a usage mode of the crane 20 to which the height changing structure 100 according to the present embodiment is applied will be described. FIG. 1 is a perspective view illustrating an example of a usage mode of the crane 20 to which the height changing structure 100 according to the present embodiment is applied. FIG. 1 shows an example of a girder construction work site for laying a rail on which a train runs. As shown in FIG. 1, the crane 20 is used for work on the gantry 3 provided on the pier 2. The gantry 3 includes a wide area 3A configured to be wide, and a narrow area 3B configured to be narrow due to the influence of, for example, a power pole P of an adjacent existing line. The gantry 3 is inclined upward from the narrow region 3B toward the wide region 3A. A track (for example, a rail) 4 is laid in the narrow region 3B, and a crane 20 that can travel along the track 4 is installed. A track 6 wider than the track 4 is laid in the wide area 3 </ b> A, and a crane 10 that can travel along the track 6 is installed. In the following description, in order to distinguish the cranes 10 and 20, the crane 10 that is substantially A-shaped when viewed from the width direction is referred to as “A-shaped crane 10”, and is substantially L-shaped when viewed from the width direction. The eggplant crane 20 will be referred to as an “L-shaped crane 20”. A suspended load is supplied from the ground from the material carry-in opening 7 provided between the tracks 4, and this suspended load is transported while being suspended by the L-shaped crane 20, and at the boundary position between the track 4 and the track 6, A Delivered to the crane 10. In the following description, the front-rear direction (bridge axis direction) in which the cranes 10, 20 travel is referred to as “front-rear direction D1”, and the width direction (bridge-axis orthogonal direction) of the cranes 10, 20 is referred to as “width direction”. This will be described as “D2”. Further, with respect to the L-shaped crane 20, the A-type crane 10 side is referred to as “front”, and the material carry-in opening 7 side is referred to as “rear”. However, the context here is for the convenience of explanation in this specification.

  First, the configuration of the A-type crane 10 will be described with reference to FIG. FIG. 2A is a view of the A-shaped crane 10 viewed from the front-rear direction D1 (here, from the rear), and FIG. 2B is a view of the A-shaped crane 10 viewed from the width direction D2. As shown in FIG. 2A, the A-shaped crane 10 extends in a longitudinal direction D1 and a pair of column portions 11A and 11B extending in the vertical direction, a cross beam portion 12 spanning the column portions 11A and 11B. Leg portions 13A and 13B connected to the lower end portions of the column portions 11A and 11B and a hanging portion 14 provided on the cross beam portion 12 are provided.

  As shown in FIG. 2B, the leg portion 13A extends in the front-rear direction D1 along the track 6, and is connected to the carriage portion 16 that moves along the track 6 on the lower end side. A carriage unit 16 is connected to both end sides of the leg unit 13A in the front-rear direction D1. 11 A of pillar parts are comprised by a pair of flame | frame 11a, 11b inclinedly arranged so that it might mutually space apart as it goes below. The frame 11a is connected to the rear end portion 13a side of the leg portion 13A, and extends obliquely upward so as to incline to the front end portion 13b side opposite to the rear end portion 13a. The frame 11b is connected to the front end portion 13b side of the leg portion 13A, and extends obliquely upward so as to incline toward the rear end portion 13a side opposite to the front end portion 13b. The frames 11a and 11b are connected to each other by a connecting beam H extending in the front-rear direction D1 at a predetermined height position. Thereby, when viewed from the width direction D2, the A-type crane 10 is configured to be substantially A-shaped. The leg portion 13B and the column portion 11B have the same configuration as the leg portion 13A and the column portion 11A.

  As shown in FIGS. 2 (a) and 2 (b), the horizontal beam portion 12 is composed of a horizontal beam 12a that connects the upper ends of the frames 11a of the column portions 11A and 11B, and the upper ends of the frames 11b of the column portions 11A and 11B. It is comprised by the horizontal beam 12b which connects. With such a configuration, the A-type crane 10 has a portal shape when viewed from the front-rear direction D1. The suspension part 14 is supported by the transverse beams 12a and 12b, and includes a traversing device, a wire winding device, and the like, and is configured to be movable along the extending direction of the lateral beam portion 12 by the power of the motor of the traversing device. Yes. Further, the hanging part 14 includes a hook 17 at the lower part. The hook 17 is formed to be movable up and down by the operation of the wire winding device of the hanging portion 14. The A-type crane 10 can lift and carry heavy objects by the hanging part 14. As described above, the A-type crane 10 has a function of moving the suspended load in the vertical direction by winding the wire at the hanging portion 14, and along the track 6 while the suspended load is suspended by the hanging portion 14. It has a function of moving in the front-rear direction by the carriage unit 16 and a function of correcting the position in the width direction D2 while the suspended load is suspended by the hanging unit 14.

  Next, the configuration of the L-shaped crane 20 will be described with reference to FIGS. FIG. 3 is a view of the L-shaped crane 20 viewed from the width direction, and FIG. 4 is a view of the L-shaped crane 20 viewed from the front-rear direction D1 (from the rear here). As shown in FIG. 4, the L-shaped crane 20 includes at least a pair of column portions 21A and 21B extending in the vertical direction, a horizontal beam portion 22 spanning the column portions 21A and 21B, and a column portion extending in the front-rear direction D1. Leg portions 23A and 23B connected to lower end portions 21a of 21A and 21B, and a suspension portion 24 provided on the cross beam portion 22 are provided. Note that “extending at least in the vertical direction” means that the direction component in which the column portions 21A and 21B extend includes at least the vertical direction. In the present embodiment, the direction component in which the column portions 21A and 21B extend includes the front-rear direction D1 in addition to the vertical direction, and part (or all) of the column portions 21A and 21B may be in the vertical direction (vertical direction). ) In the front-rear direction D1.

  As shown in FIG. 3, the leg portion 23 </ b> A extends in the front-rear direction D <b> 1 along the track 4, and is connected to the carriage portion 26 that moves along the track 4 on the lower end side. A carriage portion 26 is connected to both ends of the leg portion 23A in the front-rear direction D1. The leg 23A is connected to the lower end 21a side of the column 21A on the rear end 23a (one end in the front-rear direction D1) side. In the present embodiment, the leg portion 23A is provided on the extension portion 31 that extends in the front-rear direction and is inclined upward as the upper end portion 31a is directed toward the rear side, and on the rear end portion 23a side of the leg portion 23A. A support portion 32 connected to the lower end portion 21a of the portion 21A and supporting the column portion 21A. The leg portion 23A is configured by combining a plurality of frames. The column portion 21A is connected to and supported by the support portion 32 of the leg portion 23A and vertically extends upward, and the inclined portion 34 extends to incline upward toward the front end portion 23b side of the leg portion 23A. It is equipped with. Thereby, when viewed from the width direction D2, the L-shaped crane 20 is configured to be substantially L-shaped. Note that the leg portion 23B and the column portion 21B have the same configuration as the leg portion 23A and the column portion 21A.

  As shown in FIGS. 3 and 4, the cross beam portion 22 extends in the width direction D2 and spans the upper end portion 21b side of the pair of column portions 21A and 21B, and the column portions 21A and 21B are connected to the leg portions 23A and 23B. It arrange | positions rather than a position at the front-end part 23b side of leg part 23A, 23B. The cross beam portion 22 is provided at the tip of the inclined portion 34 of the column portions 21A and 21B. With such a configuration, the L-shaped crane 20 has a portal shape when viewed from the front-rear direction D1. The suspending portion 24 is supported by the cross beam portion 22 and includes a traversing device 36, a wire winding device 37, and the like, and is configured to be movable along the extending direction of the cross beam portion 22 by the power of the motor of the traversing device 36. Has been. Moreover, the hanging part 24 includes a hook 27 at the lower part. The hook 27 is formed to be movable up and down by the operation of the wire winding device 37 of the hanging portion 24. The L-shaped crane 20 can lift and carry heavy objects by the hanging part 24. As described above, the L-shaped crane 20 has a function of moving the suspended load in the vertical direction by winding the wire in the suspended portion 24, and along the track 4 while the suspended load is suspended by the suspended portion 24. It has a function of moving in the front-rear direction by the carriage unit 26 and a function of correcting the position in the width direction D2 while the suspended load is suspended by the hanging unit 24. In the case of the L-shaped crane 20, unlike the A-shaped crane 10, it is possible to hang a suspended load that is longer than the size in the width direction D2 between the column portions 21A and 21B. Specifically, when a long suspended load extending in the front-rear direction D1 is supplied from the material carry-in opening 7, the L-shaped crane 20 suspends the suspended load while extending in the front-rear direction D1. Next, the L-shaped crane 20 rotates the suspended load by 90 ° and suspends it while extending in the width direction D2. At this time, when the column portions 21A and 21B extend straight upward, the suspended load interferes with the column portions 21A and 21B when the suspended load is larger than the dimension between the column portions 21A and 21B. On the other hand, in the L-shaped crane 20, the cross beam portion 22 (that is, the hanging portion 24) is disposed closer to the front end portion 23b side of the leg portions 23A and 23B than the connection position of the column portions 21A and 21B to the leg portions 23A and 23B. The Therefore, even a suspended load larger than the dimension between the pillar portions 21A and 21B can be rotated in a plane without interfering with the pillar portions 21A and 21B.

  Next, the height changing structure 100 of the L-shaped crane 20 according to the present embodiment will be described.

  The height changing structure 100 includes a lower frame 20 </ b> A and an upper frame 20 </ b> B of the L-shaped crane 20, a rotating unit 40, and a driving unit 44. Specifically, as shown in FIGS. 3 and 4, in the height changing structure 100, the L-shaped crane 20 includes a lower frame 20 </ b> A and an upper frame 20 </ b> B that can be divided from each other. The lower frame 20A includes at least leg portions 23A and 23B. In the present embodiment, the lower frame 20A also includes a part (specifically, the vertical portion 33) on the lower end portion 21a side of the column portions 21A and 21B. The upper frame 20B includes at least a part (specifically, an inclined portion 34) on the upper end portion 21b side of the column portions 21A and 21B, a cross beam portion 22, and a hanging portion 24. In the present embodiment, the space between the vertical portion 33 and the inclined portion 34 corresponds to the boundary portion BL between the lower frame 20A and the upper frame 20B.

  In the height changing structure 100, a rotating unit 40 is provided between the lower frame 20A and the upper frame 20B so as to rotatably connect the lower frame 20A and the upper frame 20B. In this embodiment, the boundary part BL between the vertical part 33 which is a part of the pillar parts 21A and 21B belonging to the lower frame 20A and the inclined part 34 which is a part of the pillar parts 21A and 21B belonging to the upper frame 20B. A rotating unit 40 is provided in the vicinity. In this embodiment, the rotation part 40 is provided in the front part of the boundary part BL, and is provided in the front side of the column parts 21A and 21B. Specifically, the rotating part 40 is constituted by hinge hardwares 41 and 42 provided in the column parts 21A and 21B, respectively. The base end portion of the hinge hardware 41 is fixed to the front surface 33a of the vertical portion 33 of the lower frame 20A, and the base end portion of the hinge hardware 42 is fixed to the front surface 34a of the inclined portion 34 of the upper frame 20B. Moreover, the front-end | tip parts of the hinge metal fittings 41 and 42 are connected so that rotation is mutually possible.

  In the height changing structure 100, the upper frame 20B is connected to a driving unit 44 that rotates the upper frame 20B around the rotating unit 40. When the L-type crane 20 is disassembled, the drive unit 44 rotates the upper frame 20B little by little while supporting its weight when changing from the standing state (the state shown in FIG. 3) to the folded state (the state shown in FIG. 5). Then, a driving force for supporting the upper frame 20 is applied so as to be lowered. Further, the drive unit 44 applies a driving force that pushes the upper frame 20B when the L-shaped crane 20 is assembled from the folded state (the state shown in FIG. 5) to the standing state (the state shown in FIG. 3). To do. The drive unit 44 includes a jack 45 having an upper end 45a coupled to the upper frame 20B and a lower end 45b coupled to the lower frame 20A. The jack 45 constituting the drive unit 44 includes a cylinder 46 and a rod 47 that expands and contracts with respect to the cylinder. For example, a hydraulic jack or a screw jack can be applied. Specifically, the jack mounting hardware 48 is fixed to the middle position of the front surface 34 a of the inclined portion 34 of the upper frame 20 </ b> B, and the upper end 45 a of the jack 45 is connected to the jack mounting hardware 48. A jack fitting 49 is fixed to the middle position of the upper end 31 a of the extending portion 31 of the lower frame 20 </ b> A, and the lower end 45 b of the jack 45 is connected to the jack fitting 49. Thereby, the upper end 45a of the jack 45 is connected to the inclined portion 34 of the column portions 21A and 21B, and the lower end 45b of the jack 45 is connected to the leg portions 23A and 23B.

  As shown in a jack 45X indicated by a chain double-dashed line in FIG. 3, the upper end portion 45a is connected to the vicinity of the tip end portion of the inclined portion 34 (a position away from the rotation center), or the vicinity of a position directly below the center of gravity GP of the upper frame 20B By reducing the inclination of the jack 45X and bringing it closer to the vertical, it is possible to reduce the loss of driving force applied to the jack 45 when the upper frame 20B is lowered. Further, the jack position can be set to the outside of the center of gravity GP of the upper frame 20B with respect to the turning portion 40 that is the turning center by arranging the jack 45X. For example, when the jack position is on the inner side of the center of gravity GP of the upper frame 20B with respect to the rotation part 40, the rotation part 40, which is the rotation center, is determined from the relationship between the weight F1 of the upper frame 20B and the jack position. Since the lifting force F2 is generated, the jack pushing force F3 is increased. On the other hand, the jack position (here, the position of the jack mounting hardware 48 that is the mounting position of the jack 45 with respect to the upper frame 20B) is set to the outside of the center of gravity GP of the upper frame 20B with respect to the rotating portion 40 that is the rotation center. Thus, by eliminating the influence of the lifting force F2 and making it a downward force, the jack pushing force F3 can be reduced and the loss of the driving force applied to the jack 45 can be reduced.

  Further, in the height changing structure 100, a horizontal connecting member 51 extending in the width direction D2 is attached to the lower frame 20A. The horizontal connecting member 51 is removed while the L-shaped crane 20 is being used, and is attached when the jack 45 is driven. Further, reinforcing hardware may be attached around the hinge hardware 41, 42 and the jack mounting hardware 48, 49. Such hinge hardware 41, jack mounting hardware 48, 49, and reinforcing hardware may be attached in advance when the L-shaped crane 20 is manufactured. These may be attached only when the L-shaped crane 20 is assembled or disassembled. If the jack 45 is attached during use of the L-shaped crane 20, it interferes when the suspended load is rotated. Therefore, it is better to attach the jack 45 only when the L-shaped crane 20 is assembled or disassembled.

  Next, a method for changing the height of the L-shaped crane using the height changing structure 100 as described above will be described.

  First, the L-shaped crane 20 is divided into a lower frame 20A and an upper frame 20B. This dividing step may be performed on site or at the time of manufacturing the L-shaped crane 20. Next, between the lower frame 20A and the upper frame 20B, a rotating portion 40 that rotatably connects the lower frame 20A and the upper frame A is provided. The step of providing the rotating unit 40 may be performed on site or at the time of manufacturing the L-shaped crane 20.

  At the time of assembling the L-shaped crane 20, the L-shaped crane 20 is in a folded state (the state shown in FIG. 5) in which the upper frame 20B is folded with respect to the lower frame 20A. Therefore, the upper frame 20B is rotated around the rotation unit 40 by the drive unit 44, so that the upper frame 20B is changed from the folded state to the standing state (the state shown in FIG. 3) in which the upper frame 20B stands. Further, when the L-shaped crane 20 is disassembled, the L-shaped crane 20 is in an upright state in which the upper frame 20B is upright. Therefore, the upper frame 20B is turned from the standing state to the folded state by rotating the upper frame 20B around the rotating unit 40 by the driving unit 44. When the L-shaped crane 20 is assembled, it does not necessarily have to be in the folded state (the state shown in FIG. 5).

  Next, the operation and effect of the L-shaped crane height changing structure 100 according to the present embodiment will be described.

  In the height changing structure 100 of the L-shaped crane 20 according to the present embodiment, the L-shaped crane 20 includes a lower frame 20A including leg portions 23A and 23B, a column portion 21A and 21B, a cross beam portion 22, and a hanging portion 24. And an upper frame 20B provided with Further, between the lower frame 20A and the upper frame 20B, there is provided a rotating portion 40 that rotatably connects the lower frame 20A and the upper frame 20B. With such a structure, the L-shaped crane 20 can be in a folded state in which the upper frame 20B is folded with respect to the lower frame 20A as well as the standing state (the state in use) in which the upper frame 20B stands. . In such a folded state, the height of the L-shaped crane 20 can be made lower than the standing state that is a state when the L-shaped crane 20 is used. The upper frame 20B is connected to a drive unit 44 that rotates the upper frame 20B around the rotation unit 40. Therefore, by rotating the upper frame 20B around the rotation unit 40 by the drive unit 44, for example, when the L-shaped crane 20 is assembled, the folded state can be changed to the standing state. At the time of dismantling, the standing state can be changed to the folded state. As described above, the height of the L-shaped crane 20 can be easily changed by the height changing structure 100 according to the present embodiment. The same operation and effect can be obtained for the method of changing the height of the L-shaped crane 20 according to the present embodiment.

  Further, by reducing the height of the L-shaped crane 20 using the height changing structure 100, the members of the L-shaped crane 20 can be suspended and conveyed by the A-shaped crane 10 during disassembly or assembly. Further, as shown in FIG. 1, when disassembling and assembling work by suspending the members of the L-shaped crane 20 with the large crane vehicle CR1 on the ground, it is easy to reach from the ground by reducing the height of the L-shaped crane 20. can do. The effect is particularly great when the L-shaped crane 20 arranged at a location where the height of the gantry 3 is high is suspended. In addition, when a crane vehicle CR2 that performs work on the gantry 3 is used (for example, when a large crane vehicle cannot be arranged due to circumstances on the ground), the small crane vehicle CR2 has a limit height corresponding to the model. Therefore, when the height with respect to the L-shaped crane 20 does not reach, it is necessary to adopt the medium-sized crane vehicle CR2, but the medium-sized crane vehicle CR2 may not be applied due to the strength of the gantry 3. However, by lowering the height of the L-shaped crane 20, the work can be performed without changing the type of the crane vehicle CR2 to a larger one. Further, when the assembly place and the use place of the L-shaped crane 20 are different and there is an obstacle in the sky while moving on the track, it is possible to pass with a reduced height. When the L-shaped crane 20 is used (particularly when rotating a suspended load), the folding jack 45 can be held by detaching one of the upper and lower ends instead of removing both (hanging). Evacuation and storage to the extent of not touching the load). In addition, since the height of the L-shaped crane 20 is reduced, it is hooked (also referred to as a slinging operation, when the crane is hung by a crane A 10 or a crane vehicle CR1 or a crane vehicle CR2). In order to achieve a balance, the scaffold for performing the chain block) can be lowered, so that safety can be improved. Since the angle of inclination is known in advance by folding, a scaffold (stairs, ladder, stage (dance)) that takes this inclination into consideration may be installed.

  In the height changing structure 100 of the L-shaped crane 20 according to the present embodiment, the drive unit 44 is configured by a jack 45 having an upper end 45a coupled to the upper frame 20B and a lower end 45b coupled to the lower frame 20A. Yes. By configuring the drive unit 44 with the jack 45 in this way, the height of the L-shaped crane 20 can be changed with a simple configuration.

  In the height changing structure 100 of the L-shaped crane 20 according to the present embodiment, the upper end portion 45a of the jack 45 is connected to a position closer to the lateral beam portion 22 than the rotating portion 40 in the upper frame 20B, and the lower end portion 45b of the jack 45 is connected. Is connected to the rear end portion 23a side of the rotating portion 40 in the lower frame 20A. With such a configuration, the upper frame 20B can be rotated in a well-balanced manner.

  The present invention is not limited to the above-described embodiment.

  For example, a height changing structure 200 as shown in FIGS. In the height changing structure 200, the rotation part 240 is provided in the rear part of the boundary part BL, and is provided in the rear part of the column parts 21A and 21B. Mainly different from the change structure 100. Specifically, the rotating part 240 is configured by hinge hardwares 241 and 242 provided between the pillar parts 21A and 21B, respectively. The base end portion of the hinge hardware 241 is fixed to the rear surface 33c of the vertical portion 33 of the lower frame 20A, and the base end portion of the hinge hardware 242 is fixed to the rear surface 34c of the inclined portion 34 of the upper frame 20B. Moreover, the front-end | tip parts of the hinge metal objects 241 and 242 are connected so that rotation is mutually possible. In the height changing structure 200, the upper surface 33b of the vertical portion 33 which is the boundary surface on the lower frame 20A side is inclined downward toward the front side, and a right triangle support is provided between the upper surface 33b and the lower surface 34b of the inclined portion. The member 250 is fixed by insertion and bolts. When the L-shaped crane 20 in the state shown in FIG. 6 is folded, first, the bolts are removed, and the support member 250 is released from the boundary portion BL by releasing the fixing and friction holding state of the support member 250 by jacking up. Next, the upper frame 20B is folded by contracting the jack 45 to a state shown in FIG. If it will be in the said state, the upper surface 33b and the lower surface 34b which are boundary surfaces will be connected and fixed with a volt | bolt. When the L-shaped crane 20 is assembled, the L-shaped crane 20 is in a folded state (the state shown in FIG. 7) in which the upper frame 20B is folded with respect to the lower frame 20A. Therefore, the upper frame 20B is rotated around the rotation unit 40 by the drive unit 44, so that the upper frame 20B is changed from the folded state to the standing state (the state shown in FIG. 6) in which the upper frame 20B stands. Further, when the L-shaped crane 20 is disassembled, the L-shaped crane 20 is in an upright state in which the upper frame 20B is upright. Therefore, the upper frame 20B is turned from the standing state to the folded state by rotating the upper frame 20B around the rotating unit 40 by the driving unit 44. According to the height changing structure 200 according to such a modified example, the distance between the rotation center and the jack 45 is increased by disposing the rotation center of the rotation unit 240 on the rear side of the L-shaped crane. Thus, the jack pushing force is reduced, and the lifting force at the rotating portion 240 can also be reduced. In addition, the merit of this folding method is that if a member having the required compressive strength is inserted instead of the support member 250 even if it is interrupted in the middle of folding, not only the jack 45 but also the compression support can be safely performed. is there.

  Further, for example, a height changing structure 300 as shown in FIGS. The height changing structure 300 is mainly different from the height changing structure 100 shown in FIG. 3 in that the rotating part 340 is provided at a position lower than the rotating part 40 of the height changing structure 100 shown in FIG. It is different. Specifically, the lower frame 20A includes leg portions 23A and 23B, and the upper frame 20B includes all of the column portions 21A and 21B. That is, the vertical portion 33 belongs to the upper frame 20B, not the lower frame 20A. As a result, the space between the upper surface 32a of the support portion 32 of the leg portions 23A and 23B and the lower end portion 21a of the column portions 21A and 21B (the upper surface of the vertical portion 33) becomes the boundary portion BL, and the rotating portion 340 is provided at this position. It is done. In this case, since a large force is required for folding the upper frame 20B, a drive unit 344 using a wire is additionally provided. The drive unit 344 can rotate the upper frame 20B by providing a triangular wire attachment member 346 on the rear side of the inclined portion 34 and winding the wire 347 with a winding device (not shown). That is, the upper frame 20B can be folded while being supported by being pulled by the wire 347. In addition, the wire necessary tension | tensile_strength may be so small that the wire 347 is far from the rotation center. At this time, the jack 45 may be omitted. At the time of assembling the L-shaped crane 20, the L-shaped crane 20 is in a folded state (the state shown in FIG. 9) in which the upper frame 20B is folded with respect to the lower frame 20A. Accordingly, the upper frame 20B is rotated around the rotation unit 340 by the drive units 44 and 344, so that the upper frame 20B is changed from the folded state to the standing state (the state shown in FIG. 8) in which the upper frame 20B stands. Further, when the L-shaped crane 20 is disassembled, the L-shaped crane 20 is in an upright state in which the upper frame 20B is upright. Therefore, the upper frame 20B is turned from the standing state to the folded state by rotating the upper frame 20B around the rotation unit 340 by the driving units 44 and 344.

  Moreover, the structure of the above-mentioned L-shaped crane is only an example, and the height adjustment structure according to the present invention may be adopted even if it is changed to any shape.

DESCRIPTION OF SYMBOLS 10 ... A type crane, 20 ... L type crane (crane), 20A ... Lower frame, 20B ... Upper frame, 21A, 21B ... Column part, 22 ... Cross beam part, 23A, 23B ... Leg part, 23a ... Rear end part ( One end), 23b ... Front end (the other end), 24 ... Hanging part, 26 ... Dolly part, 40, 240, 340 ... Rotating part, 44, 344 ... Drive part, 45 ... Jack, 100 , 200, 300 ... Height changing structure.

Claims (9)

A pair of pillars extending at least in the vertical direction;
A pair of legs that extend in the front-rear direction and are connected to the carriage part, and that are connected to one end side in the front-rear direction to the lower end side of the column part,
A transverse beam that extends in the width direction and spans the upper end side of the pair of column portions, and is disposed on the other end side in the front-rear direction of the leg portion with respect to the connecting position of the column portion with respect to the leg portion. And
It is configured to be able to travel along the transverse beam portion, and suspends a suspended load longer than the size in the width direction between at least the pair of pillar portions, and the suspended load extends from the front-rear direction. A crane height changing structure comprising: a hanging portion capable of rotating the suspended load over a state in which the suspended load extends in the width direction ,
The crane is composed of a lower frame and an upper frame,
The lower frame includes at least the legs,
The upper frame includes at least a part or all of the column part, the cross beam part, and the hanging part,
Between the lower frame and the upper frame, there is provided a rotating portion that rotatably connects the lower frame and the upper frame,
A crane height changing structure, wherein the upper frame is connected to a drive unit for rotating the upper frame around the rotating unit. 2. The crane height changing structure according to claim 1, wherein the pillar portion has an inclined portion extending upward to be inclined toward the other end portion of the leg portion.   The crane height changing structure according to claim 2, wherein the rotating portion is provided at a proximal end portion of the inclined portion. The said drive part is a height change structure of the crane as described in any one of Claims 1-3 comprised by the jack by which the upper end part was connected with the said upper frame, and the lower end part was connected with the said lower frame. . The upper end portion of the jack is connected to a position closer to the transverse beam portion than the rotating portion in the upper frame, and the lower end portion of the jack is closer to the other end portion than the rotating portion in the lower frame. The crane height changing structure according to claim 4 , wherein the crane height changing structure is connected to the crane. A pair of pillars extending at least in the vertical direction;
A pair of legs that extend in the front-rear direction and are connected to the carriage part, and that are connected to one end side in the front-rear direction to the lower end side of the column part,
A transverse beam that extends in the width direction and spans the upper end side of the pair of column portions, and is disposed on the other end side in the front-rear direction of the leg portion with respect to the connecting position of the column portion with respect to the leg portion. And
A hanging part capable of traveling along the transverse beam part, and a crane height changing method comprising:
The crane is composed of a lower frame and an upper frame,
The lower frame includes at least the legs,
The upper frame includes at least a part or all of the column part, the cross beam part, and the hanging part,
At the site, attaching a rotating part that rotatably connects the lower frame and the upper frame between the lower frame and the upper frame ;
In the field, by turning the upper frame around the turning portion , the step of making the upper frame stand up from the folded state in which the upper frame is folded with respect to the lower frame ;
Removing the rotating part before using the crane, and a method for changing the height of the crane.   At the site, attaching a drive unit for rotating the upper frame around the rotation unit to the upper frame of the crane in the standing state;
  In the field, by turning the upper frame around the turning unit by the drive unit, from the standing state to the folded state,
  The method of changing the height of the crane according to claim 6, further comprising a step of removing the drive unit before using the crane.   The crane height changing method according to claim 6 or 7, wherein the column part has an inclined part extending upward so as to incline toward the other end of the leg part.   At the site, inserting a support member between the upper frame and the lower frame, and fixing the support member to the upper frame and the lower frame;
  The method of changing the height of the crane as described in any one of Claims 6-8 provided with the process of removing the said supporting member on the spot.

Images