Abstract: A method for judging a winding disorder of a rope onto a drum of a winch includes acquiring a captured image by a camera oriented to the drum, performing, on the basis of the captured image, a judgment on whether the winding disorder of the rope is present or absent and a determination of a disorder degree indicating the degree of the winding disorder, and outputting results of the judgment and the determination.

Abstract: A crane includes a strut guyline stretched between a lying lower portion, which is a portion located at a lower portion of a boom in a state where the boom and a jib are arranged in a lying attitude, and a strut, the strut guyline including a boom-side connection portion that is an end portion connected to the lying lower portion of the boom, in which a plurality of connectors includes a specific connector that is a connector arranged at a position corresponding to the lying lower portion, the plurality of coupling pins includes a specific coupling pin used in the specific connector, and the specific coupling pin or the specific connector includes a guyline attachment portion which is a portion to which the boom-side connection portion of the strut guyline is detachably attached.

Abstract: An information acquisition system includes a first input acquisition unit that acquires masses of the attachment and the suspended cargo as first input, a second input acquisition unit that acquires information about a posture of the attachment as second input, a position estimation unit that estimates the position of at least one of the attachment and the suspended cargo, based on the first input and the second input, and an information derivation unit that derives information about the possibility of interference between the external object and at least one of the attachment and the suspended cargo, based on the position of at least one of the attachment and the suspended cargo estimated by the position estimation unit.

Abstract: A backstop to prevent contact between a spacer and a peripheral member includes a rear jib backstop for a crane, having an outer cylinder, an inner cylinder, a spacer, a spacer holder and a lock mechanism. The spacer holder supports the spacer pivotally and swingably about an axis thereof and allows the spacer to fit on the inner cylinder, to keep the rear jib backstop from contracting in accordance with a change in a posture of the rear jib backstop when a boom rises. The lock mechanism enables locking of the spacer in such a manner as to keep the spacer from swinging about a swing central axis in a state where the spacer is located away from an outer surface of the inner cylinder.

Abstract: Provided are a crane enabling workability to be improved about connecting a guyline for interconnecting a strut and a boom to the boom, and a crane assembly method. A rope tip part of a winch rope is connected to an intermediate member in a state where a boom and a jib have been fallen on the ground. A winch performs a winding motion of winding the winch rope, thereby raising a strut and making the intermediate member approach a guyline connection part of the boom to allow a boom connection end part of a second guyline that is connected to the intermediate member to be connected to the guyline connection part.

Abstract: Provided are a crane capable of improving the workability for lowering and raising a strut, and a method for assembling and disassembling the crane. The crane includes a boom including a boom distal end part, a jib including a jib proximal end part, a strut connected to the boom distal end part or the jib proximal end part and raisable and lowerable by vertically rotationally movement about a strut rotation center; a winch, a winch rope wound and delivered by the winch; and a strut support unit attached to the jib back surface or the strut front surface. The strut support unit supports the strut in a fallen posture at a raisable position above the jib in a boom-and-jib fallen state. In the raisable position, a rope connection part to which the rope is connected in the strut is higher than the strut rotation center.

Abstract: In a work machine suspension device, each of a plurality of retention devices includes a support member that is supported by a first leg portion main body so as to be movable between an entry allowed position and a retention position. The entry allowed position is a position where the support member retracts from a second leg portion main body to allow a retained portion to enter between the first leg portion main body and the second leg portion main body, and the retention position is a position where the retained portion is retained on the support member while the support member is supported by the first leg portion main body and the second leg portion main body.

Abstract: A rope inspection device is capable of accurately detecting deterioration of a rope used in a work machine. The rope inspection device is attached to a crane having a machine body that includes a backstop, a boom capable of rising/lowering relative to the machine body, a winch, and a rope that is led out from the winch. The rope inspection device includes a rope inspection unit capable of inspecting the deterioration state of the rope, and a support unit attached to the machine body, the support unit supporting the rope inspection unit so that the rope inspection unit is able to follow the movement of the rope.

Abstract: A rope inspection device according to the present invention is attached to a work machine that has a machine body, a rising/lowering body capable of rising/lowering relative to the machine body, a winch, and a rope which is led out from the winch and suspended from a tip end of the rising/lowering body and which is connected to a load to be suspended. The rope inspection device includes: a rope inspection instrument capable of inspecting a deterioration state of the rope; and a support unit which is attached to the tip end of the rising/lowering body and which supports the rope inspection instrument such that the rope inspection instrument can follow movement in the horizontal direction of the rope which is suspended from the tip end.

Abstract: In a working machine, a plurality of diagonal members includes a plurality of first diagonal members for connecting a first main member and a second main member with each other, the first diagonal members including a first nearest diagonal member located nearest to a first connector connected to an end of the first main member. A first reinforcement part extends from the first nearest diagonal member to the second main member or a second connector in a first specific direction for connecting the first nearest diagonal member and, the second main member or the second connector connected to an end of the second main member with each other.

Abstract: A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.

Abstract: A coupling portion of a lower travelling body of a mobile crane is arranged such that, in plan view, a right front straight line, which passes through any point included in a front load receiving surface and through any point included in a right front load transmission surface, passes through a right front end roller or a point on the front side relative to the right front end roller and that a left front straight line, which passes through any point included in the front load receiving surface and through any point included in a left front load transmission surface, passes through a left front end roller or a point on the front side relative to the left front end roller.

Abstract: In a lower travelling body of a mobile crane, each of a right front coupling member and a right rear coupling member is arranged to change a relative position to one or both of a right crawler frame and a car body in order to reduce dimensions of the lower travelling body when it is transported. Each of a left front coupling member and a left rear coupling member is arranged to change a relative position to one or both of a left crawler frame and the car body in order to reduce dimensions of the lower travelling body when it is transported.

Abstract: A backstop to prevent contact between a spacer and a peripheral member includes a rear jib backstop for a crane, having an outer cylinder, an inner cylinder, a spacer, a spacer holder and a lock mechanism. The spacer holder supports the spacer pivotally and swingably about an axis thereof and allows the spacer to fit on the inner cylinder, to keep the rear jib backstop from contracting in accordance with a change in a posture of the rear jib backstop when a boom rises. The lock mechanism enables locking of the spacer in such a manner as to keep the spacer from swinging about a swing central axis in a state where the spacer is located away from an outer surface of the inner cylinder.

Abstract: A method for judging a winding disorder of a rope onto a drum of a winch includes acquiring a captured image by a camera oriented to the drum, performing, on the basis of the captured image, a judgment on whether the winding disorder of the rope is present or absent and a determination of a disorder degree indicating the degree of the winding disorder, and outputting results of the judgment and the determination.

Abstract: An information acquisition system includes a first input acquisition unit that acquires masses of the attachment and the suspended cargo as first input, a second input acquisition unit that acquires information about a posture of the attachment as second input, a position estimation unit that estimates the position of at least one of the attachment and the suspended cargo, based on the first input and the second input, and an information derivation unit that derives information about the possibility of interference between the external object and at least one of the attachment and the suspended cargo, based on the position of at least one of the attachment and the suspended cargo estimated by the position estimation unit.

Abstract: In a work machine suspension device, each of a plurality of retention devices includes a support member that is supported by a first leg portion main body so as to be movable between an entry allowed position and a retention position. The entry allowed position is a position where the support member retracts from a second leg portion main body to allow a retained portion to enter between the first leg portion main body and the second leg portion main body, and the retention position is a position where the retained portion is retained on the support member while the support member is supported by the first leg portion main body and the second leg portion main body.

Abstract: In a working machine, a plurality of diagonal members includes a plurality of first diagonal members for connecting a first main member and a second main member with each other, the first diagonal members including a first nearest diagonal member located nearest to a first connector connected to an end of the first main member. A first reinforcement part extends from the first nearest diagonal member to the second main member or a second connector in a first specific direction for connecting the first nearest diagonal member and, the second main member or the second connector connected to an end of the second main member with each other.

Abstract: A crawler crane includes a lower traveling body, and the lower traveling body includes: a car body; a right crawler device and a left crawler device; a front side connecting portion; and a rear side connecting portion, the right crawler device includes a right crawler frame, the left crawler device includes a left crawler frame, the front side connecting portion is separably joined to each of a front end portion of the car body, the right crawler frame front portion and the left crawler frame front portion, the rear side connecting portion is separably joined to each of a rear end portion of the car body, the right crawler frame rear portion and the left crawler frame rear portion, and each of the front side connecting portion and the rear side connecting portion includes a lattice portion which has a lattice structure.

Abstract: A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.