JP7102861B2 - crane - Google Patents

Description

The present invention relates to a crane .

Conventionally, as a mobile crane, a crane including a lower traveling body, an upper swinging body, and an undulating member is known. The undulating member is supported by the upper swing body so that it can undulate around the horizontal center axis of rotation.

Patent Document 1 discloses a crane in which a boom as an undulating member is attached to an upper swing body. The crane further includes a main winding winch, an idler sheave, a boom point sheave, a main winding rope, and a hook. The main winding winch is provided on the upper swing body. The idler receive is rotatably supported on the back side of the tip of the boom. Further, the boom point sheave is rotatably supported on the front side of the tip of the boom. After the main winding rope pulled out from the main winding winch is hung on the idler sheave, it is hung between the boom point sheave and the sheave of the sheave block provided on the hook for suspension. When the main winding winch winds up or unwinds the main winding rope, the hook hanging from the tip of the boom is wound and unwound.

When a configuration in which the hook is hung from a higher position than the crane (basic form) having a hook hanging from the tip of the boom as described above is required, the basic form described above is changed to the rafting form. The form of the crane is changed. In the rafting form, the jib is undulatingly connected to the tip of the boom, and the hook is hung from the tip of the jib via the main winding rope. The crane further comprises front struts and rear struts. The front struts are rotatably pivotally supported at the tip of the boom behind the jib and are connected to the tip of the jib by a guy line. As a result, the front strut and the jib rotate integrally. Further, the rear strut is rotatably supported at the tip of the boom behind the front strut. The jib is boomed by winding and unwinding the jib undulating rope that is hung between the sheave block placed at the tip of the front strut and the sheave block placed at the tip of the rear strut. On the other hand, it undulates.

Japanese Unexamined Patent Publication No. 2008-37535

In a crane having the above configuration, when the form of the crane is changed from the basic form in which the hook hangs from the tip of the boom to the rafting form, members not used in the predetermined form are generated and the cost of the crane increases. There was a problem that it would end up. Specifically, the idler receive provided at the tip of the boom in the basic form is unnecessary in the rafting form. On the other hand, in the rafting form, another idler receive for supporting the main winding rope is provided in the middle of the front strut and the rear strut. Therefore, the idler sheaves used in each form are individually provided, which increases the cost of the crane.

Further, in the above configuration, since the idler sheave is also provided at the tip of the boom, in the rafting form, the crane falls forward by the mass of the idler sheave during the suspension work or the self-supporting / descending work. There was a problem that the moment applied in the direction became large.

The present invention has been made in view of the above problems, and in a crane that can be changed into a plurality of forms, the cost of the crane is reduced by effectively utilizing the sheave between the forms, and the moment unnecessary for the crane. The purpose is to prevent the granting of.

The crane according to one aspect of the present invention includes a crane body, a boom undulatingly supported by the crane body, a jib undulatingly supported by the tip of the boom, and the rear side of the jib. A front strut that is rotatably supported by the tip of the boom or the base end of the jib and is connected to the jib so as to rotate integrally with the jib, and a rear side of the front strut. A rear strut rotatably supported by the tip of the boom or the base of the jib at the position of, and the jib undulations spanned between the tip of the rear strut and the tip of the front strut. By winding and unwinding the rope and the jib undulating rope, the front strut is rotated relative to the rear strut to undulate the jib, and the jib undulating winch and the suspended load. A hoisting rope for hoisting and unwinding, a hoisting winch for hoisting and unwinding the hoisting rope, a sheave capable of supporting the hoisting rope, and a rotatably supporting sheave. A sheave unit including a bracket and a first unit holding portion arranged at the tip of the boom, wherein the jib, the front strut and the rear strut are detached from the boom and from the tip of the boom. In the basic form of the crane, the suspended load rope is suspended so that the suspended load rope pulled out from the suspended load winch is supported by the sheave and hung from the tip of the boom. A first unit holding portion capable of holding a sheave unit and a second unit holding portion arranged on a specific strut, which is at least one of the rear strut and the front strut, the jib. The suspended load rope pulled out from the suspended load winch in the rafting form of the crane, in which the front strut and the rear strut are attached to the boom and the suspended load rope is hung from the tip of the jib. The sheave unit includes a second unit holding portion that is supported by the sheave and capable of holding the sheave unit so as to hang down from the tip end portion of the jib. It is selectively attached to and detached from the second unit holding portion, and the bracket of the sheave unit rotates about a predetermined first rotation axis. A pair of sheave support portions that support the sheaves as possible, and the pair of sheave support portions are arranged at positions spaced apart from the first rotation axis in the radial direction in the rotation of the sheaves. At a position spaced apart from the first hole of the bracket in the radial direction with respect to the first rotation axis, and at a position spaced apart from the first hole of the bracket in the rotation direction of the sheave. A pair of sheave support portions in which the second hole portion of the bracket to be arranged is opened, and the bracket first hole portion and the bracket second hole portion with respect to the first rotation axis of the pair of sheave support portions. A lifted portion fixed to a portion opposite to the hole portion and capable of being connected to a predetermined auxiliary lifting device, and at least one unit of the first unit holding portion and the second unit holding portion. The specific unit holding portion has a unit positioning portion that determines the position of the sheave unit with respect to the specific unit holding portion that is a holding portion, and the specific unit holding portion has an engaged portion that can be engaged with the unit positioning portion and the sheave. By accepting the unit, the pair of holding portion side support portions are arranged so as to face each of the pair of sheave support portions in the axial direction of the first rotation axis, and the pair of holding portion side support portions are provided with the pair of holding portion side support portions. A pair of holding portion-side first holes arranged so as to match the pair of bracket first holes in the axial direction, and a pair of brackets arranged so as to match the pair of bracket second holes in the axial direction. The pair of holding portion side second holes are opened respectively, and the unit positioning portion is the specific unit holding portion in a state where the lifted portion is connected to the auxiliary lifting device and the sheave unit is lifted. When the sheave unit is engaged with the engaged portion and is rotated around the second rotation axis parallel to the first rotation axis through the unit positioning portion, the bracket first hole portion is on the holding portion side. The distance between the unit positioning portion and the bracket first hole portion, the engaged portion, and the engaged portion so as to match the first hole portion and the bracket second hole portion to match the holding portion side second hole portion. While the distance between the first hole on the holding portion side and the first hole on the holding portion side is set to be the same, the distance between the first hole on the bracket and the second hole on the bracket, the first hole on the holding portion side, and the first hole on the holding portion side are set. The distances from the two holes are set to be the same .

According to this configuration, the form of the crane can be changed between a basic form in which the suspended load rope is hung from the tip of the boom and a rafting form in which the suspended load rope is hung from the tip of the jib. It is said that. The crane includes a sheave unit including a sheave, a first unit holding portion arranged on a boom and capable of holding the sheave unit, and a second unit holding portion arranged on a specific strut and capable of holding the sheave unit. When the crane is set to the basic form, the sheave unit is held by the first unit holding portion, so that the sheave can support the suspended load rope at the tip end portion of the boom. On the other hand, when the crane is set to the rafting form, the same sheave unit is held by the second unit holding portion, so that the sheave can support the suspended load rope in a specific strut. Therefore, the crane is compared to other cranes in which separate sheaves are rotatably held at the tip of the boom and specific struts to support the suspended load rope in two forms, the basic form and the rafting form. Cost can be reduced. Further, in the rafting form, since the sheave unit is not attached to the first unit holding portion, it is possible to prevent an unnecessary moment from being applied to the tip portion of the boom.

Further , according to this configuration, the sheave unit can be easily attached and fixed to the specific unit holding portion which is at least one of the first unit holding portion and the second unit holding portion. Specifically, the sheave unit is lifted in a state where an auxiliary lifting device such as an auxiliary crane is connected to the lifted portion of the sheave unit. Then, when the unit positioning portion of the sheave unit is engaged with the engaged portion of the specific unit holding portion and the sheave unit is rotated around the second rotation axis, the pair of bracket first hole portions becomes a pair of holding portions. The pair of brackets second holes match the pair of holding portion side second holes while matching the side first holes. Therefore, the operator can easily fix the sheave unit to the specific unit holding portion by inserting the connecting pin into each of the matched holes.

In the above configuration, when the specific strut or the boom is mounted on the ground, the first hole on the holding portion side of the specific unit holding portion is spaced above the second hole on the holding portion side. It is desirable that the engaged portion is arranged at the position where the unit is placed, and the engaged portion is arranged adjacent to the first hole portion on the holding portion side so that the unit positioning portion can be supported from below.

According to this configuration, when the unit positioning portion of the sheave unit is engaged with the engaged portion of the specific unit holding portion, the auxiliary lifting device lowers the sheave unit, so that the sheave unit is moved by its own weight. It can rotate around two rotation axes. Therefore, the sheave unit can be more easily fixed to the specific unit holding portion.

In the above configuration, the unit positioning portion is arranged so as to extend parallel to the first rotation shaft and connect the pair of sheave support portions to each other between the first rotation shaft and the bracket first hole portion . It is desirable that the engaged portion has a hook shape capable of holding the positioning pin from below.

According to this configuration, the sheave unit can be easily rotated around the second rotation axis by engaging the positioning pin with the engaged portion having a hook shape.

Further, the crane according to another aspect of the present invention includes a crane body, a boom undulatingly supported by the crane body, a jib undulatingly supported by the tip of the boom, and the jib. A front strut that is rotatably supported by the tip of the boom or the base end of the jib on the rear side and is connected to the jib so as to rotate integrally with the jib, and the front strut. A rear strut rotatably supported by the tip of the boom or the base of the jib at a rear position is hung between the tip of the rear strut and the tip of the front strut. The jib undulating rope and the jib undulating winch that winds and unwinds the jib undulating rope to rotate the front strut relative to the rear strut to undulate the jib. A suspended load rope for hoisting and lowering the suspended load, a suspended load winch for winding and unwinding the suspended load rope, a sheave capable of supporting the suspended load rope, and a predetermined first. A sheave unit including a bracket that rotatably supports the sheave around a rotation axis, and a first unit holding portion arranged at the tip of the boom, wherein the jib, the front strut, and the rear strut are In the basic form of the crane in which the suspended load rope is hung from the tip of the boom after being detached from the boom, the suspended load rope pulled out from the suspended load winch is supported by the sheave and said. A first unit holding portion capable of holding the sheave unit so as to hang from the tip of the boom, and a specific strut which is at least one of the rear strut and the front strut. A two-unit holding portion, the hanging load winch in a rafting form of the crane in which the jib, the front strut and the rear strut are mounted on the boom and the suspension rope is hung from the tip of the jib. The sheave is provided with a second unit holding portion capable of holding the sheave unit so that the suspended load rope drawn from the rope is supported by the sheave and hung from the tip of the jib. The unit is selectively attached to and detached from the first unit holding portion and the second unit holding portion, and the bracket of the sheave unit is attached to the bracket. A sheave support portion including a first support portion in which the first hole portion of the bracket is opened and a second support portion in which the second hole portion of the bracket is opened, and a lifting portion capable of being connected to a predetermined auxiliary lifting device. The first unit holding portion and the second unit holding portion have a first fixing portion in which the first hole portion on the holding portion side is opened and a second hole portion in which the second hole portion on the holding portion side is opened. When the holding portion side first hole portion and the holding portion side second hole portion are arranged in the horizontal direction, the bracket first hole portion and the bracket second hole portion are horizontal. By lowering the sheave unit lifted by the auxiliary lifting device in the lifted portion so as to line up in the direction, the first hole portion of the bracket matches the first hole portion on the holding portion side and the second bracket. When the hole portion matches the second hole portion on the holding portion side and the first hole portion on the holding portion side and the second hole portion on the holding portion side are aligned in the vertical direction, the first hole portion on the bracket and the said Of the sheave units lifted by the auxiliary lifting device in the lifted portion so that the second hole portions of the bracket are arranged in the horizontal direction, the first support portion engages with the first fixing portion, and then the first By rotating the sheave unit with the 1 fixing portion as a fulcrum, the second supporting portion approaches the second fixing portion, and the bracket first hole portion and the bracket second hole portion are on the holding portion side second. The lifted portion has the first support portion and the second support portion with respect to the first rotation shaft so that the first hole portion and the second hole portion on the holding portion side can be matched with each other. Is located on the opposite side.

According to the present invention, in a crane that can be changed into a plurality of forms, it is possible to reduce the cost of the crane and prevent an unnecessary moment from being applied to the crane by effectively utilizing the sheave between the forms. Can be done.

It is a side view of the 1st form (ruffing form) of the crane which concerns on one Embodiment of this invention. It is a side view of the 2nd form (basic form) of the crane which concerns on one Embodiment of this invention. It is a side view of the upper boom of the crane which concerns on one Embodiment of this invention. It is a side view which showed the mounting procedure of the idler receive of the crane which concerns on one Embodiment of this invention. It is a side view which showed the mounting procedure of the idler receive of the crane which concerns on one Embodiment of this invention. It is a side view which showed the mounting procedure of the idler receive of the crane which concerns on one Embodiment of this invention. It is a perspective view of the 1st unit holding part of the crane which concerns on one Embodiment of this invention. It is a perspective view of the sheave unit of the crane which concerns on one Embodiment of this invention. It is a perspective view which shows the state which the sheave unit was attached to the 1st unit holding part of the crane which concerns on one Embodiment of this invention. It is a side view which showed the mounting procedure of the idler receive of the crane which concerns on one Embodiment of this invention. It is a side view of the rear strut of the crane which concerns on one Embodiment of this invention. It is a top view of the rear strut of the crane which concerns on one Embodiment of this invention. It is a perspective view which shows the appearance that the sheave unit was attached to the 2nd unit holding part of the crane which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a first embodiment (crane 10A) of the crane 10 according to the embodiment of the present invention. The crane 10A shown in FIG. 1 corresponds to a so-called rafting form. Hereinafter, the directions of "up", "down", "front" and "rear" are shown in each figure, and the directions indicate the structure and assembly method of the crane 10 according to the present embodiment. It is shown for convenience for explanation, and does not limit the moving direction and usage mode of the crane according to the present invention. Further, the crane 10 according to the present embodiment can be changed to the second embodiment (crane 10B of the basic embodiment) described later by rearranging some members.

The crane 10 includes a swivel body 12 corresponding to a crane body, a traveling body 14 that supports the swivel body 12 so as to be swivel, an undulating member including a boom 16 and a jib 18, a mast 20 which is a boom undulating member, and the like. To be equipped with. Further, a counterweight 13 for adjusting the balance of the crane 10 is loaded on the rear portion of the swivel body 12. A cab 15 is provided at the front end of the swivel body 12. The cab 15 corresponds to the driver's seat of the crane 10.

The boom 16 shown in FIG. 1 is pivotally supported by the swivel body 12 so as to be undulating. The boom 16 is a so-called lattice type, and is composed of a lower boom 16A, one or more (two in the example) intermediate booms 16B, 16C and 16D, and an upper boom 16T. Specifically, the lower boom 16A is connected to the front portion of the swivel body 12 so as to be rotatable in the undulating direction. The intermediate booms 16B, 16C and 16D are detachably added to the tip side of the lower boom 16A in this order. The upper boom 16T is detachably added to the tip side of the intermediate boom 16D, and a rear strut 21 and a front strut 22 for rotating the jib 18 are rotatably connected to the tip of the upper boom 16T. The boom 16 is rotatably supported around a rotation center axis horizontal to the swivel body 12 with the boom foot pin 16S provided at the lower end as a fulcrum.

However, the specific structure of the boom is not limited in the present invention. For example, the boom may have no intermediate boom, or may have a different number of intermediate booms from the above. Further, the boom may be composed of a single member.

The jib 18 also has a lattice-shaped structure in the illustrated example, although the specific structure thereof is not limited. The jib 18 is pivotally supported on the tip of the boom 16 so as to be undulating. The base end portion of the jib 18 is rotatably connected (shaft supported) to the jib support portion 16W of the upper boom 16T of the boom 16, and the rotation center axis of the jib 18 is a boom with respect to the swivel body 12. It is a horizontal axis parallel to the rotation center axis (boom foot pin 16S) of 16.

The jib 18 is composed of a lower jib 18A, one or more intermediate jib 18B (one in the example), and an upper jib 18C. Specifically, the lower jib 18A is connected to the jib support portion 16W arranged on the upper boom 16T of the boom 16 so as to be rotatable in the undulating direction. The intermediate jib 18B is detachably added to the tip end side of the lower jib 18A. The upper jib 18C is detachably added to the tip end side of the intermediate jib 18B.

The mast 20 has a base end and a rotating end, and the base end is rotatably connected to the swivel body 12. The rotation shaft of the mast 20 is parallel to the rotation shaft of the boom 16 and is located immediately behind the rotation shaft of the boom 16. That is, the mast 20 can rotate in the same direction as the undulating direction of the boom 16. On the other hand, the rotating end of the mast 20 is connected to the tip of the boom 16 via a pair of left and right boom guy lines 24. This connection links the rotation of the mast 20 with the rotation of the boom 16.

A pair of left and right backstops 23 are provided on the swivel body 12. These backstops 23 come into contact with the left and right sides of the lower boom 16A of the boom 16 when the boom 16 reaches the standing posture shown in FIG. This contact regulates the boom 16 from being fanned backwards by strong winds or the like. In another embodiment, the pair of left and right backstops 23 are provided on the lower boom 16A, and when the boom 16 reaches the standing posture shown in FIG. 1, they come into contact with the left and right side portions of the swivel body 12. But it may be.

The rear strut 21 and the front strut 22 are rotatably supported by the tip end portion (upper boom 16T) of the boom 16. The rear strut 21 is arranged at a position on the rear side of the front strut 22. The rear strut 21 is held in a posture of projecting from the tip of the upper boom 16T to the boom standing side (left side in FIG. 1). As a means for maintaining this posture, a pair of left and right backstops 25 and a pair of left and right guy links 26 are interposed between the rear struts 21 and the boom 16. The backstop 25 is interposed between the intermediate boom 16D and the intermediate portion of the rear strut 21, and supports the rear strut 21 from below. The guy link 26 is stretched so as to connect the tip end portion of the rear strut 21 and the lower boom 16A of the boom 16, and the position of the rear strut 21 is regulated by the tension thereof. In another embodiment, the rear struts 21 and the front struts 22 may be rotatably supported by the base end portion of the jib 18. Further, the rear strut 21 may be rotatably pivotally supported at the tip end portion of the boom 16, and the front strut 22 may be rotatably pivotally supported at the base end portion of the jib 18.

The front strut 22 is rotatably pivotally supported at the tip of the boom 16 behind the jib 18 and is connected to the jib 18 so as to rotate (integrally) with the jib 18. Specifically, a pair of left and right jib guy lines 28 are stretched so as to connect the tip of the front strut 22 and the tip of the jib 18. Therefore, the jib 18 is also rotationally driven by the rotational drive of the front strut 22. The rear strut 21 described above forms a substantially isosceles triangular shape with the front strut 22.

Various winches are mounted on the crane 10. Specifically, a boom undulating winch 30 for undulating the boom 16, a jib undulating winch 32 for rotating the jib 18 in the undulating direction, and a main winding for hoisting and lowering the suspended load. A winch 34 for use is installed. In the crane 10 according to the present embodiment, the boom undulating winch 30 is installed near the base end of the mast 20. Further, the jib undulating winch 32 and the main winding winch 34 are installed on the lower boom 16A of the boom 16. These winches 30, 32, and 34 may be mounted on the swivel body 12.

The boom undulating winch 30 winds up and unwinds the boom undulating rope 38. Then, the boom undulating rope 38 is arranged so that the mast 20 rotates by this winding and unwinding. Specifically, sheave blocks 40 and 42 in which a plurality of sheaves are arranged in the width direction are provided at the rotating end of the mast 20 and the rear end of the rotating body 12, respectively, and are pulled out from the boom undulating winch 30. The boom undulating rope 38 is hung between the sheave blocks 40 and 42. Therefore, when the boom undulating winch 30 winds up and extends the boom undulating rope 38, the distance between the two sheave blocks 40 and 42 changes, whereby the mast 20 and the boom 16 interlocking with the mast 20 undulate. Rotate in the direction.

The jib undulating winch 32 winds up and unwinds the jib undulating rope 44 wound between the rear strut 21 and the front strut 22. Then, the jib undulating rope 44 is arranged so that the front strut 22 rotates relative to the rear strut 21 by this winding and unwinding. Specifically, a guide sheave 46 is provided at the intermediate portion in the longitudinal direction of the rear strut 21, and a plurality of sheaves are arranged in the width direction at the rotating end of the rear strut 21 and the rotating end of the front strut 22. Sheave blocks 47 and 48 are provided. Then, the jib undulating rope 44 pulled out from the jib undulating winch 32 is hung on the guide sheave 46, and between the sheave blocks 47 and 48 (between the tip of the rear strut 21 and the tip of the front strut 22). It is handed over to. Therefore, the winding and unwinding of the jib undulating rope 44 by the jib undulating winch 32 changes the distance between the two sheave blocks 47 and 48, and rotates the front strut 22 and the jib 18 interlocking with the front strut 22 in the undulating direction. ..

The main winding winch 34 winds and unwinds the suspended load by the main winding rope 50 (suspended load rope). Regarding this main winding, idler sheaves 54 and 53 are rotatably provided at a portion near the base end of the rear strut 21 and a portion near the base end of the front strut 22, respectively, and the tip portion (upper jib 18C) of the jib 18 is provided with rotatably. The idler sheave 52 is attached. Further, a main winding sheave block in which a plurality of main winding point sheaves 56 are arranged in the width direction is provided at a position adjacent to the idler sheave 52. The main winding rope 50 drawn from the main winding winch 34 is hung on the idler sheaves 54 and 53 and the idler sheave 52 in order, and the main winding point sheave 56 of the sheave block and the main hook 57 (hook) for hanging are used. It is hung between the sheave 58 and the sheave 58 of the sheave block provided in. Therefore, when the main winding winch 34 (winding winch) winds up or unwinds the main winding rope 50, the distance between the sheaves 56 and 58 changes, and the main winding hangs down from the tip of the jib 18. The main hook 57 connected to the rope 50 is wound and unwound.

FIG. 2 is a side view of a second embodiment (crane 10B) of the crane 10 according to the present embodiment. The crane 10 (10A) shown in FIG. 1 is disassembled on the ground, and a part of the members assemble the crane 10B shown in FIG. The crane 10B corresponds to a so-called basic form.

The crane 10B is not mainly equipped with the jib 18, the rear strut 21, the front strut 22, and the like among the cranes 10A shown in FIG. Further, the members (backstop 25, guy link 26) for supporting these members are not equipped.

In the crane 10B shown in FIG. 2, the main winding rope 50 hangs down from the tip end portion (upper boom 16T) of the boom 16. Specifically, an idler receive 54 is rotatably mounted on the back side of the upper boom 16T. Further, in the upper boom 16T, a main winding sheave block in which a plurality of main winding point sheaves 16X are arranged in the width direction is provided at a position below the jib support portion 16W and adjacent to the idler sheave 54. ing. Then, the main winding rope 50 pulled out from the main winding winch 34 is hung on the idler sheave 54, and the main winding point sheave 16X of the sheave block and the sheave block provided on the main hook 57 for suspension are provided. It is hung between the sheave 58 and the sheave 58. Therefore, when the main winding winch 34 winds up or unwinds the main winding rope 50, the distance between the sheaves 16X and 58 changes, and the winch 34 is connected to the main winding rope 50 hanging from the tip of the boom 16. The main hook 57 is wound and unwound.

With reference to FIGS. 1 and 2, in the present embodiment, the idler sheave 54 mounted near the base end of the rear strut 21 in the crane 10A of FIG. 1 is the tip of the boom 16 in the crane 10B of FIG. It is attached to. That is, the idler receive 54 is selectively attached to the rear strut 21 of the crane 10A and the tip of the boom 16 of the crane 10B.

FIG. 3 is a side view of the upper boom 16T of the crane 10 (10B) according to the present embodiment. In FIG. 3, the upper boom 16T of the crane 10B of FIG. 2 is arranged so as to be inverted in the front-rear direction. 4 to 6 are side views showing a procedure for mounting the idler receive 54 of the crane 10B according to the present embodiment. FIG. 7 is a perspective view of the sheave mounting portion 16P of the crane 10B. FIG. 8 is a perspective view of the sheave unit 54S of the crane according to the embodiment of the present invention. FIG. 9 is a perspective view showing a state in which the sheave unit 54S is mounted on the sheave mounting portion 16P of the crane 10B according to the present embodiment.

As shown in FIG. 2, in the basic form of the crane 10 (crane 10B), the rear strut 21 and the front strut 22 are detached from the boom 16, and the main winding rope 50 is hung from the tip of the boom 16. Further, in the crane 10B, the idler receive 54 is attached to the upper boom 16T. When the boom 16 is disassembled into the lower boom 16A, the intermediate booms 16B to 16D, and the upper boom 16T, the upper boom 16T is arranged on the ground G in the posture shown in FIG. 3 from the viewpoint of safety. (A posture in which the bottom surface of the upper boom 16T is in contact with the ground G, extending in a direction orthogonal to the longitudinal direction of the boom 16).

In addition to the above-mentioned main winding point sheave 16X and jib support portion 16W, the upper boom 16T includes a pair of left and right upper boom frame plates 160, a boom first pipe 161 and a boom second pipe 162, and a sheave mounting portion 16P ( First unit holding unit) and.

The pair of left and right upper boom frame plates 160 are members that define the left and right end portions of the upper boom 16T. The boom first pipe 161 and the boom second pipe 162 are pipe materials extending in the left-right direction, respectively, and connect a pair of left and right upper boom frame plates 160 to each other. The boom first pipe 161 is arranged above the boom second pipe 162. In addition to the boom first pipe 161 and the boom second pipe 162, other pipe materials are arranged so as to connect the pair of left and right upper boom frame plates 160 to each other.

The sheave mounting portion 16P is arranged on the boom first pipe 161 and the boom second pipe 162 (the tip end portion of the boom 16), and allows the sheave unit 54S to be mounted. With reference to FIGS. 3 and 7, the sheave mounting portion 16P has a pair of left and right first fixing portions 161A and a pair of left and right second fixing portions 162A. The sheave mounting portion 16P holds the sheave unit 54S in the crane 10B so that the main winding rope 50 pulled out from the main winding winch 34 is supported by the idler sheave 54 and hung from the tip end portion of the boom 16. ..

The pair of first fixing portions 161A are arranged at intervals in the central portion in the left-right direction of the boom first pipe 161. The first fixing portion 161A is a plate-shaped member fixed to the boom first pipe 161 so as to project forward and downward (rear and downward in FIG. 2) of FIGS. 3 and 7 from the outer peripheral surface of the boom first pipe 161. Is. The first fixing portion 161A has a first fixing hole portion 161B and a pin engaging portion 161C (engaged portion). The first fixing hole portion 161B is a circular hole portion formed so as to penetrate the first fixing portion 161A in the left-right direction in the vicinity of the central portion of the first fixing portion 161A. The pin engaging portion 161C is arranged on the tip side of the first fixing portion 161A with respect to the first fixing hole portion 161B, and has a hook shape. The pin engaging portion 161C allows the positioning pin 544 of the sheave unit 54S to engage.

As shown in FIG. 7, the pair of second fixing portions 162A are arranged below the pair of first fixing portions 161A at intervals. Further, the pair of second fixing portions 162A are arranged at intervals in the central portion in the left-right direction of the boom second pipe 162. The second fixing portion 162A is a plate-shaped member fixed to the boom second pipe 162 so as to project forward and upward (rear and upward in FIG. 2) of FIGS. 3 and 7 from the outer peripheral surface of the boom second pipe 162. Is. The second fixing portion 162A has a second fixing hole portion 162B. The second fixing hole portion 162B is a circular hole portion formed so as to penetrate the second fixing portion 162A in the left-right direction in the vicinity of the tip portion of the second fixing portion 162A. As shown in FIG. 4, the straight line connecting the center of the first fixing hole portion 161B and the center of the second fixing hole portion 162B extends along a substantially vertical direction.

The pair of left and right first fixing portions 161A and the second fixing portion 162A constitute a pair of holding portion side support portions of the present invention. By receiving the sheave unit 54S, the pair of holding portion side support portions are arranged so as to face each of the pair of fixing brackets 54T in the axial direction of the sheave rotation shaft 541. Further, in the pair of holding portion side support portions, a pair of first fixing hole portions 161B (holding portions) that can be arranged so as to match the pair of bracket first hole portions 542 in the axial direction. A pair of second fixing holes 162B (holding portion side second hole portion) that can be arranged so as to match the side first hole portion) and the pair of bracket second hole portions 543 in the axial direction. ) And are opened respectively.

On the other hand, referring to FIG. 8, in addition to the idler sheave 54 described above, the sheave unit 54S includes a pair of left and right fixing brackets 54T (sheave support portions) that rotatably support the idler sheave 54, and a pair of left and right lifting brackets. It has a bracket 54W and a positioning pin 544 (unit positioning unit). The idler receive 54 can support the main winding rope 50.

The pair of fixing brackets 54T support the sheave unit 54S so as to be rotatable about the sheave rotation shaft 541 (predetermined first rotation shaft). The pair of fixing brackets 54T are members having a substantially V shape, and are arranged at intervals in the left-right direction. At the bent portion of the pair of fixing brackets 54T, a sheave rotation shaft 541 extends in the left-right direction so as to connect the pair of fixing brackets 54T to each other. The sheave rotation shaft 541 rotatably supports the idler sheave 54 and serves as a rotation shaft in the rotation of the idler sheave 54. As shown in FIG. 7, the idler sheave 54 pivotally supported by the sheave rotation shaft 541 is arranged between a pair of left and right fixing brackets 54T. Further, a bracket first hole portion 542 and a bracket second hole portion 543 are formed at the two tip portions of the V-shaped fixing bracket 54T, respectively. Each of these holes is a circular hole opened so as to penetrate the fixing bracket 54T in the left-right direction. The bracket first hole portion 542 is arranged at a position spaced apart from the sheave rotation shaft 541 in the radial direction in the rotation of the idler sheave 54. The bracket second hole portion 543 is arranged at a position spaced apart from the sheave rotation shaft 541 in the radial direction and at a position spaced apart from the bracket first hole portion 542 in the rotation direction of the idler sheave 54. Will be done.

The pair of lifting brackets 54W are fixed to the fixing bracket 54T so as to project from the vicinity of the bent portion of the pair of fixing brackets 54T. The lifting bracket 54W is fixed to the sheave rotation shaft 541 of the fixing bracket 54T on the side opposite to the bracket first hole portion 542 and the bracket second hole portion 543. As shown in FIG. 8, a lifting hole 54W1 is opened at the tip of the lifting bracket 54W. The lifting bracket 54W is connected to the auxiliary crane AC (auxiliary lifting device) (FIG. 4) via the lifting hole portion 54W1.

The positioning pin 544 is a pin extending between the sheave rotation shaft 541 and the bracket first hole portion 542 so as to connect a pair of left and right fixing brackets 54T to each other, and has a cylindrical shape. When the sheave unit 54S including the idler sheave 54 is mounted on the sheave mounting portion 16P, the positioning pin 544 is engaged with the pin engaging portion 161C. As a result, the idler sheave 54 determines the position of the sheave unit 54S with respect to the sheave mounting portion 16P and the sheave mounting portion 21P (specific unit holding portion) described later.

Next, a process in which the crane 10 is set in the basic form will be described with reference to FIGS. 4 to 9. The sheave unit 54S detached from the sheave mounting portion 21P is mounted on the sheave mounting portion 16P, the boom 16 is mounted on the swivel body 12, and the main winding rope 50 pulled out from the main winding winch 34 is sheave. The crane 10 is made into a basic form by guiding the idler sheave 54 of the sheave unit 54S mounted on the mounting portion 16P and hanging the main winding rope 50 from the tip end portion of the boom 16 (basic crane assembly process). Next, before the above step, a preparatory step in which the sheave unit 54S is mounted on the upper boom 16T of FIG. 3 will be described.

As shown in FIG. 4, a rope hanging from the hook of the auxiliary crane AC is connected to the lifting hole portion 54W1 of the lifting bracket 54W. While the sheave unit 54S is lifted by the auxiliary crane AC, the sheave unit 54S is brought closer to the sheave mounting portion 16P of the upper boom 16T. Eventually, as shown in FIG. 5, while the sheave unit 54S descends (arrow D1 in FIG. 5), the positioning pin 544 of the sheave unit 54S is engaged with the pair of left and right pin engaging portions 161C from above.

Further, when the sheave unit 54S is lowered by the auxiliary crane AC, the sheave unit 54S rotates backward with the positioning pin 544 as a fulcrum (arrow D2 in FIG. 5). As a result, as shown in FIGS. 6 and 9, the first hole portion 542 of the bracket of the sheave unit 54S and the first fixing hole portion 161B of the first fixing portion 161A match, and the bracket second of the sheave unit 54S The positions of the hole 543 and the second fixing hole 162B of the second fixing 162A match. Then, the operator inserts the connecting pin S1 into the bracket first hole portion 542 and the first fixing hole portion 161B, and inserts the connecting pin S2 into the bracket second hole portion 543 and the second fixing hole portion 162B. .. As a result, the sheave unit 54S including the idler sheave 54 is mounted and fixed to the sheave mounting portion 16P of the upper boom 16T of the boom 16. In addition, referring to FIG. 4 (a view seen from a direction parallel to the sheave rotation shaft 541), the positions of the respective holes are matched by the rotation of the sheave unit 54S around the positioning pin 544 as described above. While the distance between the positioning pin 544 and the bracket first hole 542 and the distance between the pin engaging portion 161C and the first fixing hole 161B are set to be the same, the bracket first hole 542 and the bracket second hole 542 are set to be the same. The distance to the portion 543 and the distance between the first fixing hole portion 161B and the second fixing hole portion 162B are set to be the same.

When the sheave unit 54S is removed from the upper boom 16T, the connecting pins S1 and S2 are pulled out, and then a process opposite to the above mounting process is performed in the order of FIGS. 6, 5, and 4. Will be done.

As described above, when the sheave unit 54S including the idler sheave 54 is mounted on the sheave mounting portion 16P of the upper boom 16T, the main winding rope 50 is hung from the tip end portion of the boom 16 in the crane 10B of FIG. The hook shown in the figure enables the hoisting and unwinding work of the suspended load.

The sheave unit 54S may be attached to or detached from the sheave mounting portion 16P not only when the upper boom 16T is independently mounted on the ground (FIG. 3) but also when the boom 16 is laid down on the ground. FIG. 10 is a side view showing a procedure for mounting the idler sheave 54 of the crane 10 according to the present embodiment, in which the sheave unit 54S mounts the sheave of the upper boom 16T in a state where the boom 16 is integrally laid down on the ground. It is a figure which showed the state of being attached to the part 16P.

As shown in FIG. 10, while the sheave unit 54S is lifted by the auxiliary crane AC, the sheave unit 54S is brought closer to the sheave mounting portion 16P of the upper boom 16T of the boom 16 from above. Eventually, while the sheave unit 54S is lowered, the positioning pin 544 of the sheave unit 54S is engaged with the pair of left and right pin engaging portions 161C from above and behind.

As a result, the bracket first hole portion 542 of the sheave unit 54S and the first fixing hole portion 161B of the first fixing portion 161A match, and the bracket second hole portion 543 and the second fixing portion 162A of the sheave unit 54S The position with the second fixing hole 162B matches. Then, the operator inserts the connection pin S1 (FIG. 6) prepared in advance into the bracket first hole portion 542 and the first fixing hole portion 161B, and inserts the connection pin S2 (FIG. 6) into the bracket second hole portion. It is inserted into 543 and the second fixing hole 162B. As a result, the sheave unit 54S including the idler sheave 54 is mounted and fixed from above to the sheave mounting portion 16P of the upper boom 16T of the boom 16.

Even in such a case, when the sheave unit 54S is removed from the upper boom 16T, the connecting pins S1 and S2 are pulled out, and then a process opposite to the above mounting process is performed.

On the other hand, when the crane 10 is changed from the basic crane 10B shown in FIG. 2 to the rafting crane 10A shown in FIG. 1, the sheave unit 54S removed from the upper boom 16T is used as the rear strut 21. It is mounted on the sheave mounting portion 21P of. When assembling the crane 10 in the rafting form, the boom 16 is attached to the swivel body 12, and the sheave unit 54S detached from the sheave mounting portion 16P is attached to the sheave mounting portion 21P of the rear strut 21 and then jibed. 18, The rear strut 21 and the front strut 22 are attached to the boom 16, and the main winding rope 50 pulled out from the main winding winch 34 is guided by the idler sheave 54 of the sheave unit 54S attached to the sheave mounting portion 21P, and the jib By hanging the main winding rope 50 from the tip of the 18th, the crane 10 is made into a rafting form (ruffing crane assembly process). 11 and 12 are side views and plan views of the rear strut 21 of the crane 10 (10A) according to the present embodiment. FIG. 13 is a perspective view showing a state in which the sheave unit 54S is mounted on the sheave mounting portion 21P of the crane 10 (10A) according to the present embodiment.

With reference to FIG. 11, the rear strut 21 includes a pair of left and right struts first main frame 211, a pair of left and right struts second main frame 212, and a plurality of struts 213. In FIG. 11, the strut first main frame 211 and the strut second main frame 212 on the right side appear. The pair of strut first mainframes 211 and strut second mainframes 212 form a square cross section of the rear struts 21. That is, the strut first main frame 211 and the strut second main frame 212 are arranged at the four corners of the rear strut 21. The plurality of struts 213 connect the strut first main frame 211 and the strut second main frame 212 to each other, respectively. Further, the rear strut 21 has a sheave block 47, a strut foot 21S, a strut first pipe 261 and a strut second pipe 262, and a sheave mounting portion 21P (second unit holding portion).

The sheave block 47 is rotatably supported by the tip of the rear strut 21. As described above, the jib undulating rope 44 is hung on the sheave block 47.

The strut first pipe 261 and the strut second pipe 262 are pipe materials extending in the left-right direction, respectively, and a pair of left and right strut second main frames 212 and a pair of left and right strut first main frames 211 are placed in the left-right direction. Connect to each other. In FIG. 11, the strut first pipe 261 is arranged above the strut second pipe 262, and in FIG. 1, the strut first pipe 261 is arranged below the strut second pipe 262 (FIG. 1). Not shown). In addition to the strut first pipe 261 and the strut second pipe 262, other pipe materials are arranged so as to connect the strut second main frame 212 and the strut first main frame 211 to each other. The strut foot 21S is rotatably supported by the upper boom 16T of the boom 16.

The sheave mounting portion 21P has the same structure as the sheave mounting portion 16P described above. The sheave mounting portion 21P is arranged on the strut first pipe 261 and the strut second pipe 262, and allows the sheave unit 54S to be mounted (FIG. 13). The sheave mounting portion 21P is a sheave unit so that the main winding rope 50 pulled out from the main winding winch 34 is supported by the idler sheave 54 and hung from the tip of the jib 18 in the rafting form 10A of the crane 10. Holds 54S. With reference to FIG. 13, the sheave mounting portion 21P has a pair of left and right first fixing portions 261A and a second fixing portion 262A. The first fixing portion 261A has a first fixing hole portion 261B and a pin engaging portion 261C, similarly to the first fixing portion 161A described above. Further, the second fixing portion 262A has a second fixing hole portion 262B in the same manner as the above-mentioned second fixing portion 162A.

The step of mounting the sheave unit 54S on the sheave mounting portion 21P of the rear strut 21 is the same as the mounting step of the sheave mounting portion 16P described above. At this time, the sheave unit 54S is mounted on the sheave mounting portion 21P from above with the rear strut 21 mounted on the ground in the posture shown in FIG. As shown in FIG. 12, the rear strut 21 is formed with an insertion space H into which the sheave unit 54S can enter. Further, the step of detaching the sheave unit 54S from the sheave mounting portion 21P of the rear strut 21 is the same as the step of detaching the sheave mounting portion 16P described above.

As described above, when the sheave unit 54S including the idler sheave 54 is mounted on the sheave mounting portion 21P of the rear strut 21, the main winding rope 50 pulled out from the main winding winch 34 in the crane 10A of FIG. 1 It is hung from the tip end portion of the jib 18 via the idler sheaves 54, 53 and 52, and the suspended load can be lifted and suspended by a hook (not shown).

As described above, in the present embodiment, the crane 10 has a basic form in which the main winding rope 50 is hung from the tip of the boom 16 and a rafting form in which the main winding rope 50 is hung from the tip of the jib 18. The form can be changed between. Then, the crane 10 includes a sheave unit 54S including an idler sheave 54, a sheave mounting portion 16P arranged on the boom 16 and capable of holding the sheave unit 54S, and a sheave mounting portion arranged on the rear strut 21 and capable of holding the sheave unit 54S. 21P and. When the crane 10 is set to the basic form, the sheave unit 54S is held by the sheave mounting portion 16P, so that the main winding rope 50 can be supported by the idler sheave 54 at the tip of the boom 16. On the other hand, when the crane 10 is set to the rafting form, the sheave unit 54S is held by the sheave mounting portion 21P, so that the main winding rope 50 can be supported by the idler sheave 54 on the rear strut 21. Therefore, compared to other cranes in which separate sheaves are rotatably held at the tip of the boom 16 and the rear struts 21 to support the main rope 50 in two forms, the basic form and the rafting form. , The cost of the crane 10 can be reduced. Further, in the rafting form, since the sheave unit 54S is not mounted on the sheave mounting portion 16P, it is possible to prevent an unnecessary moment from being applied to the tip portion of the boom 16.

Further, according to the above embodiment, the sheave unit 54S can be easily mounted and fixed to the sheave mounting portion 16P (specific unit holding portion). Specifically, the sheave unit 54S is lifted in a state where the auxiliary lifting device such as the auxiliary crane AC is connected to the lifting bracket 54W of the sheave unit 54S. Then, the positioning pin 544 of the sheave unit 54S is engaged with the pin engaging portion 161C of the sheave mounting portion 16P, and the sheave unit 54S is rotated around the rotation axis (second rotation axis) of the positioning pin 544 parallel to the sheave rotation shaft 541. When rotated, the pair of left and right bracket first hole portions 542 match the left and right pair of left and right first fixing hole portions 161B, and the left and right pair of bracket second hole portions 543 form the left and right pair of second fixing hole portions. Matches 162B. Therefore, the operator can easily fix the sheave unit 54S to the sheave mounting portion 16P by inserting the connecting pins S1 and S2 into the matching holes.

In particular, in the present embodiment, when the upper boom 16T of the boom 16 is mounted on the ground, the first fixing hole portion 161B of the sheave mounting portion 16P is spaced above the second fixing hole portion 162B. The pin engaging portion 161C is arranged adjacent to the first fixing hole portion 161B so that the positioning pin 544 can be supported from below. According to such a configuration, when the positioning pin 544 of the sheave unit 54S is engaged with the pin engaging portion 161C of the sheave mounting portion 16P, the auxiliary crane AC lowers the sheave unit 54S to lower the sheave unit 54S. The sheave unit 54S can rotate around the rotation axis of the positioning pin 544 by its own weight. Therefore, the sheave unit 54S can be more easily fixed to the sheave mounting portion 16P.

Further, in the present embodiment, the positioning pin 544 is arranged between the sheave rotation shaft 541 and the bracket first hole portion 542 so as to extend in parallel with the sheave rotation shaft 541 and to connect the pair of left and right fixing brackets 54T to each other. The pin engaging portion 161C has a hook shape capable of holding the positioning pin 544 from below. According to such a configuration, by engaging the positioning pin 544 with the pin engaging portion 161C having a hook shape, the sheave unit 54S can be easily rotated around the rotation axis of the positioning pin 544. Regarding the above contents, the same effect is exerted on the sheave mounting portion 21P (specific unit holding portion).

Further, the method of assembling the crane according to the present embodiment includes an idler sheave 54 capable of supporting the main winding rope 50 and a fixing bracket 54T for rotatably supporting the idler sheave 54, and the sheave arranged on the rear strut 21. A step of preparing a sheave unit 54S that can be selectively attached to and detached from the sheave mounting portion 16P arranged at the mounting portion 21P and the tip of the boom 16, and a sheave mounting the sheave unit 54S in a state of being detached from the sheave mounting portion 21P. The boom 16 is attached to the swivel body 12 after being attached to the portion 16P, and the main winding rope 50 pulled out from the main winding winch 34 is guided by the idler sheave 54 of the sheave unit 54S attached to the sheave mounting portion 16P. The basic crane assembly process of making the crane 10 a basic form by hanging the main winding rope 50 from the tip of the boom 16 and the state in which the boom 16 is mounted on the swivel body 12 and detached from the sheave mounting portion 16P. After mounting the sheave unit 54S on the sheave mounting portion 21P, the jib 18, front strut 22 and rear strut 21 are mounted on the boom 16, and the main winding rope 50 pulled out from the main winding winch 34 is mounted on the sheave mounting portion 21P. The crane is guided by the idler sheave 54 of the sheave unit 54S, and the main winding rope 50 is hung down from the tip end portion of the jib 18, thereby forming the crane into a rafting form.

According to such a method, another crane that rotatably holds a separate sheave at the tip of the boom 16 and the rear strut 21 to support the main rope 50 in two forms, the basic form and the rafting form. The cost of the crane 10 can be reduced as compared with the assembly method of. Further, in the rafting form, since the sheave unit 54S is not mounted on the sheave mounting portion 16P, it is possible to prevent an unnecessary moment from being applied to the tip portion of the boom 16. In addition, in order to use the common sheave unit 54S between the respective forms, a step of replacing one of the sheave mounting portion 16P and the sheave mounting portion 21P with the other of the sheave unit 54S in advance is included.

The method of assembling the crane 10 (10A, 10B) and the crane 10 (method of changing the form) according to the embodiment of the present invention has been described above. The present invention is not limited to these forms. The present invention can take, for example, the following modified embodiments.

(1) In the above embodiment, when the sheave unit 54S is attached to and detached from the upper boom 16T, the upper boom 16T is placed on the ground G as shown in FIG. The sheave unit 54S may be attached to or detached from the upper boom 16T of the boom 16 with the boom 16 lying down on the ground.

(2) In the above embodiment, the sheave unit 54S has been described in such a manner that it can be attached to and detached from the sheave mounting portion 21P arranged on the rear strut 21 in addition to the sheave mounting portion 16P arranged on the boom 16. , The sheave unit 54S may be detachable from a sheave mounting portion (specific unit holding portion) (not shown) arranged on the front strut 22 (specific strut).

10 Crane 10A Basic form 10B Roughing form 12 Swivel body (crane body)
14 Traveling body 16 Boom 161 Boom 1st pipe 161A 1st fixing part 161B 1st fixing hole part (1st hole part on the holding part side)
161C pin engaging part (engaged part)
162 Boom 2nd pipe 162A 2nd fixing part 162B 2nd fixing hole part (holding part side 2nd hole part)
16A Lower boom 16B, 16C, 16D Intermediate boom 16P Sheave mounting part (1st unit holding part)
16T Upper boom 16W Jib support 16X Main winding point Sheave 18 Jib 20 Mast 21 Rear strut 21P Sheave mounting part (2nd unit holding part)
211 Strut 1st main frame 212 Strut 2nd main frame 213 Strut lattice 22 Front strut 261 Strut 1st pipe 261A 1st fixing part 261B 1st fixing hole part (1st hole part on the holding part side)
261C pin engaging part (engaged part)
262 Strut 2nd pipe 262A 2nd fixing part 262B 2nd fixing hole part (2nd hole part on the holding part side)
32 Jib undulating winch 34 Main winding winch (hanging load winch)
44 Jib undulating rope 50 Main winding rope (hanging load rope)
54 Idler Sheave (Sheave)
541 Sheave rotation axis (first rotation axis)
542 Bracket 1st hole 543 Bracket 2nd hole 544 Positioning pin (unit positioning part)
54S Sheave Unit 54T Fixing Bracket (Bracket, Pair of Sheave Supports)
54W lifting bracket (lifted part)
56 Point sheave for main winding 57 Hook 70 Long boom 71-76 Intermediate boom 81 Guy line 82 Idler sheave AC Auxiliary crane (auxiliary lifting device)
G ground

Claims (4)

It ’s a crane,
Crane body and
A boom that is undulatingly supported by the crane body,
A jib that is undulatingly supported at the tip of the boom,
A front strut that is rotatably supported by the tip of the boom or the base end of the jib on the rear side of the jib and is connected to the jib so as to rotate integrally with the jib.
A rear strut that is rotatably pivotally supported at the tip of the boom or the base of the jib at a position posterior to the front strut.
A jib undulating rope hung between the tip of the rear strut and the tip of the front strut,
A jib undulating winch that undulates the jib by rotating the front strut relative to the rear strut by winding and unwinding the jib undulating rope.
Suspended load ropes for hoisting and unwinding suspended loads,
A winch for hanging loads that winds up and unwinds the hanging load rope, and
A sheave unit including a sheave capable of supporting the suspended load rope and a bracket for rotatably supporting the sheave.
A first unit holding portion arranged at the tip of the boom, the jib, the front strut and the rear strut are detached from the boom, and the hanging rope is hung from the tip of the boom. In the basic form of the crane, the sheave unit can be held so that the suspended load rope pulled out from the suspended load winch is supported by the sheave and hung from the tip of the boom. 1 unit holding part and
A second unit holding portion arranged on a specific strut, which is at least one of the rear strut and the front strut, wherein the jib, the front strut, and the rear strut are mounted on the boom and of the jib. In the rafting form of the crane in which the suspended load rope is hung from the tip portion, the suspended load rope pulled out from the suspended load winch is supported by the sheave and hung from the tip portion of the jib. A second unit holding unit capable of holding the sheave unit and
With
The sheave unit is selectively attached to and detached from the first unit holding portion and the second unit holding portion.
The bracket of the sheave unit
A pair of sheave support portions that support the sheave so as to be rotatable around a predetermined first rotation shaft, and the pair of sheave support portions are provided with the first rotation shaft in the radial direction in the rotation of the sheave. A bracket first hole arranged at a position spaced from the above, and a sheave at a position spaced apart from the first rotation axis in the radial direction with respect to the bracket first hole. A pair of sheave support parts, each of which has an opening in the second hole of the bracket, which is arranged at a position spaced apart in the rotation direction of
Of the pair of sheave support portions, the first hole portion of the bracket and the portion opposite to the second hole portion of the bracket may be fixed to the first rotation shaft and connected to a predetermined auxiliary lifting device. Possible lifting parts and
A unit positioning unit that determines the position of the sheave unit with respect to a specific unit holding unit that is at least one of the first unit holding unit and the second unit holding unit.
Have,
The specific unit holding unit is
An engaged portion that can be engaged with the unit positioning portion,
By accepting the sheave unit, it is a pair of holding portion side support portions that are arranged so as to face each of the pair of sheave support portions in the axial direction of the first rotation axis, and the pair of holding portion side support portions. Is arranged so as to match the pair of bracket first holes in the axial direction with the pair of holding portion-side first holes and the pair of brackets with the second holes in the axial direction. A pair of second hole portions on the holding portion side to be arranged are opened, respectively.
The unit positioning portion is engaged with the engaged portion of the specific unit holding portion in a state where the lifted portion is connected to the auxiliary lifting device and the sheave unit is lifted, and the sheave unit is the unit positioning portion. When it is rotated around the second rotation axis parallel to the first rotation axis, the first hole of the bracket matches the first hole on the holding portion side and the second hole of the bracket is on the holding portion side. While the distance between the unit positioning portion and the bracket first hole portion and the distance between the engaged portion and the holding portion side first hole portion are set to be the same so as to match the second hole portion. A crane in which the distance between the first hole of the bracket and the second hole of the bracket and the distance between the first hole on the holding portion side and the second hole on the holding portion side are set to be the same . In a state where the specific strut or the boom is placed on the ground, the first hole on the holding portion side of the specific unit holding portion is arranged at a position spaced above the second hole on the holding portion side. The crane according to claim 1 , wherein the engaged portion is arranged adjacent to the first hole portion on the holding portion side so that the unit positioning portion can be supported from below. The unit positioning portion is a positioning pin arranged between the first rotation shaft and the bracket first hole portion so as to extend in parallel with the first rotation shaft and connect the pair of sheave support portions to each other. can be,
The crane according to claim 2 , wherein the engaged portion has a hook shape capable of holding the positioning pin from below. It ’s a crane,
Crane body and
A boom that is undulatingly supported by the crane body,
A jib that is undulatingly supported at the tip of the boom,
A front strut that is rotatably supported by the tip of the boom or the base end of the jib on the rear side of the jib and is connected to the jib so as to rotate integrally with the jib.
A rear strut that is rotatably pivotally supported at the tip of the boom or the base of the jib at a position posterior to the front strut.
A jib undulating rope hung between the tip of the rear strut and the tip of the front strut,
A jib undulating winch that undulates the jib by rotating the front strut relative to the rear strut by winding and unwinding the jib undulating rope.
Suspended load ropes for hoisting and unwinding suspended loads,
A winch for hanging loads that winds up and unwinds the hanging load rope, and
A sheave unit including a sheave capable of supporting the suspended load rope and a bracket for rotatably supporting the sheave around a predetermined first rotation axis.
A first unit holding portion arranged at the tip of the boom, the jib, the front strut and the rear strut are detached from the boom, and the hanging rope is hung from the tip of the boom. In the basic form of the crane, the sheave unit can be held so that the suspended load rope pulled out from the suspended load winch is supported by the sheave and hung from the tip of the boom. 1 unit holding part and
A second unit holding portion arranged on a specific strut, which is at least one of the rear strut and the front strut, wherein the jib, the front strut, and the rear strut are mounted on the boom and of the jib. In the rafting form of the crane in which the suspended load rope is hung from the tip portion, the suspended load rope pulled out from the suspended load winch is supported by the sheave and hung from the tip portion of the jib. A second unit holding unit capable of holding the sheave unit and
With
The sheave unit is selectively attached to and detached from the first unit holding portion and the second unit holding portion.
The bracket of the sheave unit
A sheave support portion including a first support portion in which the first hole portion of the bracket is opened and a second support portion in which the second hole portion of the bracket is opened,
A lifted part that can be connected to a predetermined auxiliary lifting device,
Have,
The first unit holding portion and the second unit holding portion each have a first fixing portion in which the first hole on the holding portion side is opened and a second fixing portion in which the second hole on the holding portion side is opened. death,
When the first hole on the holding portion side and the second hole on the holding portion side are aligned in the horizontal direction, the lifting is performed so that the first hole of the bracket and the second hole of the bracket are aligned in the horizontal direction. By lowering the sheave unit lifted by the auxiliary lifting device in the portion, the first hole portion of the bracket matches the first hole portion on the holding portion side, and the second hole portion of the bracket is the second hole portion on the holding portion side. Matches the 2 holes,
When the first hole on the holding portion side and the second hole on the holding portion side are aligned in the vertical direction, the lifting is performed so that the first hole in the bracket and the second hole in the bracket are aligned in the horizontal direction. Of the sheave units lifted by the auxiliary lifting device in the unit, after the first support portion engages with the first fixed portion, the sheave unit is rotated around the first fixed portion as a fulcrum. Then, the second support portion approaches the second fixing portion, and the bracket first hole portion and the bracket second hole portion match the holding portion side first hole portion and the holding portion side second hole portion, respectively. So that you can
A crane in which the lifted portion is arranged on the side opposite to the first support portion and the second support portion with respect to the first rotation shaft.

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