JP2016175754A - Crane boom detaching apparatus and crane boom detaching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an increase in the size, weight and cost of a revolving super structure by enabling attachment/detachment of a boom without the need for use of a power device different from a crane.SOLUTION: A boom attachment/detachment device 1 includes a boom 20, and a boom suspension 50 that is arranged on a boom tip side X2 with respect to a revolving super structure 13. The boom suspension 50 supports the boom 20 so that a back end (an end on a boom back end side X1) of the boom 20 can move in a boom extraction/contraction direction X, when the boom 20 makes a telescopic motion in a state in which connection between the revolving super structure 13 and the boom 20 by a boom foot pin 20a is released.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a crane boom detaching apparatus and a crane boom detaching method.

  For example, Patent Literature 1 describes a technique for attaching / detaching (attaching / removing) a boom to / from an upper swing body. FIG. 11 of the same document describes a technique in which the boom is attached and detached using a power device (“other weighting means” in the summary of the same document) different from the crane to which the boom is attached and detached. . In addition, FIGS. 1 to 8 and a summary of the same document describe a technique in which a boom is attached and detached using a boom cradle.

JP-A-5-330790

  As described in the summary of Patent Document 1, the boom cradle allows the boom to be attached and detached without other weighting means. However, as described in FIGS. 3 and 4 of the document, the boom cradle is disposed between the boom support bracket (“foot bracket” in the document) and the boom. Therefore, there is a problem that the upper swing body is increased in size. Further, there is a problem that the weight of the upper swing body increases due to the boom cradle, and there is a problem that the cost of the upper swing body increases. For example, when the upper swing body is transported, the size and weight of the upper swing body are not preferred because the transport dimensions and transport weight are limited by laws and regulations.

  Therefore, the present invention provides a crane boom detachment apparatus and a crane boom detachment which can detach and attach a boom without using a power unit different from a crane, and can suppress the enlargement, weight and cost of the upper swing body. It aims to provide a method.

  According to a first aspect of the present invention, a crane boom attaching / detaching device includes a boom and a boom support portion. The boom is detachably attached to the upper swing body via a boom foot pin, and is extendable. The boom support part is disposed closer to the boom tip than the upper swing body. The boom support portion is configured such that a rear end portion of the boom is movable in a boom extending / contracting direction when the boom expands / contracts in a state where the connection between the upper swing body and the boom by the boom foot pin is disconnected. The boom is supported.

  The crane boom attaching / detaching method of the second invention is used for a crane equipped with a boom. The boom is detachably attached to the upper swing body via a boom foot pin, and is extendable. The boom is extended and retracted in a state where the boom is supported on the boom tip side of the upper swing body and in a state where the connection of the upper swing body and the boom by the boom foot pin is disconnected. Then, the rear end portion of the boom is moved in the boom extending / contracting direction.

According to the first invention, the boom can be attached and detached without using a power unit different from the crane, and the size, weight, and cost of the upper-part turning body can be suppressed.
According to the second invention, the boom can be attached and detached without the need to use a power unit different from the crane, and the enlargement, weight, and cost of the upper-part turning body can be suppressed.

1 is an overall view of a boom detaching device 1. FIG. FIG. 2 is a view corresponding to FIG. 1 showing a state in which the boom 20 is removed from the upper swing body 13 shown in FIG. 1. It is an enlarged view of the boom front end side support device 60 shown in FIG. FIG. 4 is a view taken along arrow F4 in FIG. 3. FIG. 5 is a view taken along arrow F5 in FIG. 3. It is an enlarged view of the second boom rear end side support device 72 shown in FIG. It is F7-F7 arrow sectional drawing of FIG. It is F8 arrow line view of FIG. It is a figure which shows the crane 10 shown in FIG. It is a figure which shows the boom removal | desorption apparatus 1 in the middle of removal | desorption of the boom 20 shown in FIG. It is a figure which shows the boom removal | desorption apparatus 1 in the middle of removal | desorption of the boom 20 shown in FIG. It is a figure which shows the boom removal | desorption apparatus 1 in the middle of removal | desorption of the boom 20 shown in FIG. It is a figure which shows the boom removal | desorption apparatus 1 in the middle of removal | desorption of the boom 20 shown in FIG. It is a figure which shows the boom removal | desorption apparatus 1 in the middle of removal | desorption of the boom 20 shown in FIG. FIG. 3 is a diagram corresponding to FIG. 1 of a second embodiment. FIG. 9B is a diagram corresponding to FIG. 9A of the second embodiment. FIG. 9B is a diagram corresponding to FIG. 9B of the second embodiment. FIG. 9C is a diagram corresponding to FIG. 9C of the second embodiment. FIG. 9D is a diagram corresponding to FIG. 9D of the second embodiment. FIG. 9E is a diagram corresponding to FIG. 9E of the second embodiment. FIG. 9F is a diagram corresponding to FIG. 9F of the second embodiment.

  With reference to FIGS. 1-9F, the boom attachment / detachment apparatus 1 of 1st Embodiment is demonstrated.

  As shown in FIGS. 1 and 2, the boom detaching device 1 is a device that detaches a boom 20 (below) from the upper swing body 13 (below). As shown in FIG. 1, the boom detaching device 1 includes a crane 10, a truck 40 (conveying carriage), and a boom support device 50.

  The crane 10 is a construction machine including a boom 20 (described below), and more specifically, a mobile crane. The crane 10 includes a lower traveling body 11, an upper swing body 13, a boom 20, and a telescopic hydraulic hose 33 (see FIG. 2).

The lower traveling body 11 includes a crawler 11a and is a part that causes the crane 10 to travel.
The upper swing body 13 is mounted on the lower travel body 11 so as to be rotatable with respect to the lower travel body 11. The upper swing body 13 includes a swing frame 15, an operator cab 17, a hoisting cylinder 19, and a hoisting cylinder support device 19s. A boom support bracket 15 a to which the boom 20 is attached is part of the turning frame 15. The cab 17 is mounted on the turning frame 15. The hoisting cylinder 19 is a cylinder for hoisting the boom 20 with respect to the upper swing body 13, and is a hydraulic cylinder. The base end portion of the hoisting cylinder 19 is connected to the revolving frame 15 via the hoisting cylinder foot pin 19a. The tip of the hoisting cylinder 19 is connected to the boom 20 via a hoisting cylinder rod pin 19b. The hoisting cylinder support device 19s supports the hoisting cylinder 19 with respect to the revolving frame 15 when the hoisting cylinder 19 and the boom 20 are separated (when the hoisting cylinder rod pin 19b is removed).

The boom 20 is a member to which a hook H1 or the like (see FIG. 9A) for hanging a suspended load is attached. The boom 20 is attached to the upper swing body 13 via a boom foot pin 20a so as to be able to rise and fall with respect to the upper swing body 13. The boom foot pin 20a is a pin that connects the base end (boom foot) of the boom 20 and the boom support bracket 15a. The boom 20 is extendable and retractable. More specifically, the boom 20 has an insertion structure (box-type telescopic structure), includes a plurality of unit booms, and specifically includes a four-stage unit boom. The boom 20 includes a proximal boom 21, a second boom 22, a third boom 23, and a distal boom 25 in order from the proximal end (rear end) to the distal end. In addition, the boom 20 includes a telescopic cylinder 31 (see FIG. 2).
Below, the case where the boom 20 is arrange | positioned so that the longitudinal direction of the boom 20 may become a horizontal direction (or substantially horizontal direction) is demonstrated. The direction (longitudinal direction) in which the boom 20 can be expanded and contracted is defined as a boom extending and contracting direction X. The side from the front end side of the boom 20 toward the rear end side is referred to as a boom rear end side X1, and the opposite side is referred to as a boom front end side X2. The width direction of the boom 20 (the horizontal direction orthogonal to the boom expansion / contraction direction X) is defined as a boom width direction Y.

  The proximal boom 21 (basic boom) is the unit boom on the most rear side X1 of the plurality of unit booms constituting the boom 20. The proximal boom 21 includes an undulating cylinder mounting bracket 21a. The hoisting cylinder mounting bracket 21a is provided on the abdominal surface (lower surface) of the proximal boom 21 and is a portion to which the hoisting cylinder rod pin 19b is attached.

The tip boom 25 is the unit boom on the most distal end side X2 among the plurality of unit booms constituting the boom 20. As shown in FIG. 3, the end portion (tip portion) of the tip boom 25 on the boom tip side X2 includes a side plate 25a, a tip sheave 25b, and a tip sheave fixing pin 25c.
The side plates 25a and 25a are two plate members facing each other in the boom width direction Y as shown in FIG.
The tip sheaves 25b are pulleys arranged at the lower end of the tip of the tip boom 25. A plurality of tip sheaves 25b are provided so as to line up in the boom width direction Y, for example, four. A lifting rope for hanging the hook H1 (see FIG. 9A) is hung on the tip sheave 25b.
The tip sheave fixing pin 25c (boom point pin) is a pin that rotatably supports the tip sheave 25b with respect to the side plate 25a. The tip sheave fixing pin 25c extends in the boom width direction Y and protrudes on both outer sides in the boom width direction Y from the two side plates 25a and 25a.
As shown in FIG. 9A, an auxiliary sheave 27 for suspending the auxiliary hook H2 may be attached to the tip boom 25.

As shown in FIG. 2, the telescopic cylinder 31 is a hydraulic cylinder that is disposed inside the boom 20 and expands and contracts the boom 20.
The telescopic hydraulic hose 33 is a hydraulic hose for supplying and discharging oil between the telescopic cylinder 31 and the upper swing body 13, and is connected to the end of the boom rear end X 1 of the boom 20 and the upper swing body 13. Connected.

  The truck 40 (conveyance carriage) is an automobile provided with a loading platform 41 for conveying cargo. The truck 40 is a cart for transporting the boom 20, and can also transport cargo other than the boom 20.

  The boom support device 50 (boom support portion) is a device for supporting the boom 20. The boom support device 50 is disposed on the boom tip side X2 with respect to the upper swing body 13, and more specifically, is disposed at a position away from the upper swing body 13 and is disposed on the boom tip side X2 with respect to the cab 17. The boom support device 50 is provided on the truck 40, and more specifically, mounted (arranged) on the loading platform 41. The boom support device 50 includes a frame 51, a boom front end side support device 60 (boom front end side support portion), and a boom rear end side support device 70 (boom rear end side support portion).

  The frame 51 is a part that supports the boom front end side support device 60 and the boom rear end side support device 70. The frame 51 is fixed to the loading platform 41 and is disposed, for example, from the end of the loading platform 41 on the boom front end side X2 to the end of the boom rear end side X1. The frame 51 includes a rail 53, a lateral member 55 (see FIG. 5), and a stopper 57.

  The rail 53 is a rod-shaped member that extends in the boom expansion / contraction direction X. As shown in FIG. 5, a plurality of rails 53 are provided at intervals in the boom width direction Y, and specifically, two rails 53 are provided. In FIG. 5, the boom 20 is indicated by an imaginary line (two-dot chain line) (the same applies to FIG. 8). As shown in FIG. 4, the cross section of the rail 53 viewed from the boom extending / contracting direction X is, for example, C-shaped, and may be I-shaped. As shown in FIG. 2, the length of the rail 53 in the boom expansion / contraction direction X is substantially the same as the length of the proximal boom 21.

  As shown in FIG. 5, two horizontal members 55 are disposed at or near the end of the boom tip side X <b> 2 of the frame 51. Each of the two lateral members 55 and 55 extends in the boom width direction Y and is disposed so as to connect the two rails 53 to each other. A member (not shown) similar to the lateral member 55 is provided for joining the two rails 53.

  As shown in FIG. 2, the stopper 57 is disposed at or near the end of the frame 51 on the boom rear end side X <b> 1. The stopper 57 restricts the movement of the boom rear end side support device 70 to the boom rear end side X1.

  The boom tip side support device 60 (boom tip side support portion) is a portion that supports the boom tip side X2 portion of the boom 20, and more specifically, is a portion that supports the tip boom 25, and supports the tip boom 25. It is an apparatus (a jig, a fixing jig) to perform. As shown in FIG. 3, the boom tip side support device 60 includes a tip fixing portion 61, a reinforcing member 63, and a fixing pin 65.

  The tip fixing portion 61 supports the tip boom 25, more specifically, has a U-shaped recess for supporting the tip sheave fixing pin 25c and for supporting (receiving) the tip sheave fixing pin 25c from below. As shown in FIG. 4, two tip fixing portions 61 are provided at an interval in the boom width direction Y, and support the tip sheave fixing pins 25c on both outer sides in the boom width direction Y than the side plate 25a. As shown in FIG. 3, the tip fixing portion 61 protrudes upward from the frame 51. The front end fixing portion 61 is fixed to the frame 51, and more specifically, is fixed in the vicinity of the end portion of the rail 53 on the boom front end side X2, and between the two horizontal members 55 and 55 (between the boom extending and contracting direction X). It is fixed to the rail 53 at the position.

  The reinforcing member 63 is a member that reinforces fixation (connection) between the frame 51 and the tip fixing portion 61. The reinforcing member 63 is fixed to an end surface (more specifically, both end surfaces) of the tip fixing portion 61 in the boom extending / contracting direction X and an upper surface (of the rail 53) of the frame 51, and has a plate shape, for example.

  The fixing pin 65 is a pin (lock pin) for preventing the tip sheave fixing pin 25 c from being detached from the tip fixing portion 61. The fixing pin 65 is disposed above the tip sheave fixing pin 25c received by the tip fixing part 61, and connects the upper ends of the U-shaped recesses of the tip fixing part 61 in the boom expansion / contraction direction X. 61 is attached.

  As shown in FIG. 2, the boom rear end support device 70 is disposed closer to the boom rear end X1 than the boom front end support device 60. The boom rear end side support device 70 supports the boom 20, more specifically, supports the proximal boom 21 and supports (receives) the proximal boom 21 from below. The boom rear end side support device 70 is a cart (support cart) that is movable in the boom expansion / contraction direction X. The movement of the boom rear end side support device 70 in the boom width direction Y is restricted. The boom rear end side support device 70 is configured to be adjustable to an arbitrary height. A plurality of boom rear end side support devices 70 are provided at intervals in the boom extending / contracting direction X, specifically, two. The boom rear end side support device 70 includes a first boom rear end side support device 71 and a second boom rear end side support device 72. The first boom rear end side support device 71 and the second boom rear end side support device 72 are configured similarly.

  The second boom rear end side support device 72 is disposed closer to the boom rear end side X1 than the first boom rear end side support device 71. As shown in FIG. 6, the second boom rear end support device 72 includes an outer frame 81, an inner frame 82, a top plate 83, a lifting cylinder 85, a wheel support 87, a wheel 88, An apparatus 89.

The outer frame 81 and the inner frame 82 are nested, and are configured to be extendable in the vertical direction. The inner frame 82 is disposed inside the outer frame 81 and is movable up and down with respect to the outer frame 81. As shown in FIG. 8, each of the outer frame 81 and the inner frame 82 has a frame shape (periphery, a shape surrounding a space) when viewed from above, and is, for example, a quadrangle when viewed from above.
As shown in FIGS. 6 and 7, the top plate 83 is a part that contacts the base end boom 21 (boom 20) and supports the base end boom 21 (boom 20). The top plate 83 constitutes the upper end portion of the second boom rear end side support device 72 and is fixed to the upper end portion of the inner frame 82. The thickness direction of the top plate 83 is the vertical direction. In FIG. 7, the internal structure of the boom 20 is omitted.

  The elevating cylinder 85 (supporting height changing portion) changes the top plate 83 (the portion that supports the boom 20) to an arbitrary height. More specifically, the inner frame 82 and the top plate 83 are moved relative to the outer frame 81. Move up and down. The elevating cylinder 85 is disposed inside the outer frame 81 and the inner frame 82, and is disposed below the top plate 83. The raising / lowering cylinder 85 is a cylinder which can be expanded-contracted to an up-down direction, for example, is a hydraulic cylinder etc.

  The wheel support portion 87 is a portion that supports the wheel 88 with respect to the outer frame 81. The wheel support 87 is fixed to the outer frame 81, protrudes from the outer frame 81 to both sides in the boom extending / contracting direction X, and is, for example, plate-shaped, and is orthogonal to the boom width direction Y, for example.

  The wheel 88 makes the second boom rear end side support device 72 movable (movable) in the boom extending / contracting direction X. The wheel 88 is attached to the outer frame 81 via a wheel support portion 87 and is rotatable with respect to the outer frame 81. The wheel 88 is disposed (mounted) on the rail 53 and can roll on the rail 53. As shown in FIG. 8, a plurality of wheels 88 are provided, specifically, four wheels 88 are provided. The four wheels 88 are arranged at intervals in the boom expansion / contraction direction X and the boom width direction Y, and are arranged in the vicinity of the four corners of the outer frame 81 when viewed from above. Two wheels 88 are arranged on each rail 53.

As shown in FIG. 7, the securing device 89 is a device for securing the proximal boom 21 (boom 20) to the second boom rear end side support device 72. The lashing device 89 includes a lashing member 89a and a lashing member fixing portion 89b.
The tying member 89a is a member that can tie the outer peripheral portion of the proximal boom 21 and specifically includes, for example, a band, a belt, a rope, or a chain. The length of the securing member 89a can be adjusted. A contact member (not shown) may be provided between the securing device 89 and the outer periphery of the proximal boom 21. For example, the angular contact applied to the corner of the proximal boom 21 viewed from the boom expansion / contraction direction X. A member may be provided.
The lashing member fixing portion 89b is a portion to which the lashing member 89a is fixed. The lashing member fixing portion 89b is fixed to the outer frame 81, and more specifically, projects outward from the outer frame 81 in the boom width direction Y. The lashing member fixing portion 89b is provided with a portion for attaching the lashing member 89a. Specifically, for example, a hook-shaped portion or a hole (both not shown) is provided. 7, the securing member 89a may be fixed to the inner frame 82 or the top plate 83.

(Boom removal method)
The outline of the boom attaching / detaching method by the boom attaching / detaching apparatus 1 shown in FIG. 2 is as follows. The boom 20 is supported on the boom tip side X2 relative to the upper swing body 13 (see FIGS. 9A to 9C). Further, the upper swing body 13 and the boom 20 are disconnected from each other by the boom foot pin 20a and the undulating cylinder rod pin 19b. In these states, the boom 20 is expanded and contracted to move the proximal boom 21 (the end of the boom 20 on the boom rear end side X1) in the boom expansion / contraction direction X. Thereby, the boom 20 is attached to and detached from the upper swing body 13 (see FIGS. 9D to 9F). The details of the boom removal method are as follows.

(Removal of the boom 20)
As shown in the order of FIGS. 9A to 9F, the boom 20 is removed from the upper swing body 13. Below, removal of the boom 20 is demonstrated along a procedure.

  The hook H1, the auxiliary sheave 27, and the auxiliary hook H2 shown in FIG. 9A are removed from the boom 20.

As shown in FIG. 9B, the track 40 moves (retreats) in front of the upper swing body 13 (boom tip side X2). At this time, the truck 40 moves so that the rail 53 is disposed directly below the boom 20. The boom 20 is extended from the most contracted state and slightly raised from the horizontal direction. Thereby, the front-end | tip part of the front end boom 25 is arrange | positioned just above the boom front end side support apparatus 60. FIG.
The first boom rear end side support device 71 is disposed on the rail 53, and more specifically, is disposed at the end (or the vicinity thereof) of the rail 53 on the boom rear end side X1.

As shown in FIG. 9C, the boom 20 is lowered, and the distal end portion of the distal end boom 25 is lowered. Thereby, as shown in FIG. 3, the tip sheave fixing pin 25 c is supported (becomes) by the tip fixing portion 61. Then, the fixing pin 65 is attached to the tip fixing portion 61, whereby the tip sheave fixing pin 25 c is fixed to the tip fixing portion 61.
As shown in FIG. 9C, the height of the first boom rear end side support device 71 is adjusted. More specifically, the top plate 83 is raised by extending the elevating cylinder 85 shown in FIG. Thereby, the first boom rear end side support device 71 receives the load of the boom 20 and supports the boom 20.
As shown in FIG. 9C, the proximal boom 21 is secured to the first boom rear end support device 71 by the securing device 89.

  The boom foot pin 20a is removed from the proximal boom 21 and the boom support bracket 15a. The hoisting cylinder rod pin 19b is removed from the hoisting cylinder 19 and the hoisting cylinder mounting bracket 21a. At this time, the hoisting cylinder 19 is supported by the hoisting cylinder support device 19s. At this time, the load of the boom 20 is received by the first boom rear end side support device 71, and the front end boom 25 is fixed by the boom front end side support device 60. Therefore, when the boom foot pin 20a is removed, the boom 20 is restrained from moving (for example, falling), so that the boom foot pin 20a can be easily removed (the same applies to the removal of the undulating cylinder rod pin 19b). At this time, the boom 20 is fixed at the tip sheave by the support by the boom tip side support device 60 (tip fixing portion 61 (see FIG. 3)) and the height adjustable support by the first boom rear end side support device 71. The undulation can be performed with the pin 25c (see FIG. 3) as an axis.

  As shown in FIG. 9D, the boom 20 is contracted by the telescopic cylinder 31 (see FIG. 2). As a result, the proximal boom 21 moves to the boom distal end X2 with respect to the distal boom 25, and the proximal boom 21 is removed from the upper swing body 13 (from the boom support bracket 15a). At this time, the first boom rear end side support device 71 follows the movement of the base end boom 21 (follows the extension of the boom 20) and smoothly travels in the boom extending / contracting direction X along the rail 53. . In a state where the boom 20 is contracted to some extent (a state longer than the most contracted state), the reduction of the boom 20 is stopped.

  The second boom rear end side support device 72 is installed on the rail 53, more specifically, is disposed at the end (or the vicinity thereof) of the rail 53 on the boom rear end side X1, and the boom is more than the hoisting cylinder mounting bracket 21a. It arrange | positions at the rear end side X1. Similarly to the first boom rear end side support device 71, the height of the second boom rear end side support device 72 is adjusted, and the proximal end boom 21 is secured by the securing device 89. At this time, the height of the first boom rear end side support device 71 may be adjusted according to the adjustment of the height of the second boom rear end side support device 72.

  As shown in FIG. 9E, the boom 20 is further retracted. More specifically, the boom 20 is retracted to a position where the end (boom foot) of the boom 20 on the boom rear end side X1 and the hoisting cylinder 19 do not interfere in the vertical direction. Then, the boom rear end side support device 70 is lowered.

  As shown in FIG. 9F, the boom 20 is contracted to the minimum contracted state (or a state close to the minimum contraction). Thereafter, the telescopic hydraulic hose 33 is removed from the boom 20. Thereafter, the boom 20 is conveyed by the truck 40 while the boom 20 is supported by the boom support device 50.

(Attaching the boom 20)
The boom 20 is attached to the upper swing body 13 in the order of FIG. 9F to FIG. 9A by a procedure reverse to the above-described procedure of attaching the boom 20 (or a procedure almost reverse). Below, attachment of the boom 20 is demonstrated along a procedure. 9A to 9F will be described assuming that the arrow indicating the direction of operation is reverse.

As shown in FIG. 9F, the telescopic hydraulic hose 33 is attached to the boom 20.
As shown in FIG. 9E, the boom 20 is extended by the telescopic cylinder 31 (see FIG. 2), whereby the proximal boom 21 moves to the boom rear end X1 with respect to the distal boom 25. At this time, the boom rear end side support device 70 follows the movement of the base end boom 21 and travels to the boom rear end side X1. The boom 20 is raised by raising the boom rear end side support device 70 to a position where the end (boom foot) on the boom rear end side X1 of the boom 20 and the hoisting cylinder 19 do not interfere with each other.

As shown in FIG. 9D, the boom 20 is further extended. More specifically, the boom 20 is extended until the second boom rear end side support device 72 moves to the end portion (or the vicinity thereof) of the rail 53 on the boom rear end side X1.
The securing member 89 a of the second boom rear end side support device 72 is removed from the boom 20.
The second boom rear end side support device 72 is lowered, and the second boom rear end side support device 72 is removed from the rail 53.

As shown in FIG. 9C, the boom 20 is further extended, and the height of the first boom rear end side support device 71 is adjusted. At this time, the boom 20 is fixed at the tip sheave by the support by the boom tip side support device 60 (tip fixing portion 61 (see FIG. 3)) and the height adjustable support by the first boom rear end side support device 71. The undulation can be performed with the pin 25c (see FIG. 3) as an axis. Thereby, the pin hole of the boom foot pin 20a and the pin hole of the hoisting cylinder rod pin 19b are aligned in the vertical direction. The boom foot pin 20a is attached to the boom support bracket 15a and the boom 20 in a state where this alignment is performed. Further, in this state of alignment, the undulating cylinder rod pin 19b is attached to the undulating cylinder 19 and the undulating cylinder mounting bracket 21a. Therefore, the boom foot pin 20a and the undulating cylinder rod pin 19b can be easily attached.
The securing member 89 a of the first boom rear end side support device 71 is removed from the boom 20.
The fixing pin 65 of the boom tip side support device 60 shown in FIG. 3 is removed from the tip fixing portion 61.

As shown in FIGS. 9C to 9B, when the boom 20 is raised, the tip sheave fixing pin 25c shown in FIG. Thereafter, the truck 40 moves forward and back (moves to the boom tip side X2).
As shown in FIG. 9A, the hook H <b> 1, the auxiliary hook H <b> 2, and the auxiliary sheave 27 are attached to the boom 20.

(Effect 1)
The effects of the boom detaching apparatus 1 shown in FIG. 1 are as follows. The boom detaching device 1 includes a boom 20 and a boom support device 50. The boom 20 is attached to the upper swing body 13 via a boom foot pin 20a so as to be raised and lowered, and is extendable.
[Configuration 1-1] The boom support device 50 is disposed closer to the boom tip side X2 than the upper swing body 13.
[Configuration 1-2] The boom support device 50 has a boom rear end X1 of the boom 20 when the boom 20 expands and contracts in a state where the upper revolving unit 13 and the boom 20 are disconnected by the boom foot pin 20a. The boom 20 is supported so that the end portion (rear end portion) thereof can move in the boom extending / contracting direction X.

  In the above [Configuration 1-2], the expansion and contraction operation of the boom 20 is used as power for attaching and detaching the boom 20 to and from the upper swing body 13. Therefore, the boom 20 can be attached and detached without using a power unit different from the crane 10.

In the above [Configuration 1-1], the boom support device 50 is provided separately from the upper swing body 13. Therefore, it is not necessary to provide the upper swing body 13 with a structure for supporting the boom 20 when the boom 20 is detached. Therefore, the enlargement of the upper swing body 13 can be suppressed. More specifically, in the present embodiment, the gap in the width direction between the boom support bracket 15a and the boom 20 is compared with the case where the “boom cradle” described in Patent Document 1 is provided in the upper swing body 13. Therefore, the width of the upper swing body 13 can be reduced. Moreover, since it is not necessary to provide a boom cradle in the upper swing body 13, the weight of the upper swing body 13 can be suppressed, and the cost increase of the upper swing body 13 can be suppressed.
As a result of the increase in size and weight of the upper swing body 13, the amount of fuel and exhaust gas required for the operation of the crane 10 can be suppressed. Moreover, the vehicle for transporting the upper swing body 13 can be reduced in size, the amount of fuel and exhaust gas required for transporting the upper swing body 13 can be suppressed, and the cost required for transporting the upper swing body 13 can be suppressed.

(Effect 2)
[Configuration 2] As shown in FIG. 2, the boom support device 50 includes a boom front end side support device 60 and a boom rear end side support device 70 disposed closer to the boom rear end side X1 than the boom front end side support device 60. .

  With this [Configuration 2], the boom 20 can be supported more reliably than when only one of the boom front end side support device 60 and the boom rear end side support device 70 is provided. Therefore, the boom 20 can be reliably attached to and detached from the upper swing body 13.

(Effect 3)
[Configuration 3] The boom support device 50 includes a rail 53 extending in the boom extending and contracting direction X. The boom rear end side support device 70 is movable in the boom extending / contracting direction X along the rail 53.

  With this [Configuration 3], the boom rear end side support device 70 moves following the expansion and contraction operation of the boom 20. Therefore, the boom rear end side support device 70 can reliably support the boom 20 that is expanding and contracting. Further, compared to the case where the boom rear end side support device 70 does not follow the rail 53, the boom rear end side support device 70 is likely to move smoothly, so that noise generated by the movement of the boom rear end side support device 70 can be easily suppressed. .

(Effect 4)
[Configuration 4] As shown in FIG. 6, the boom rear end support device 70 includes a lifting cylinder 85 (supporting height changing unit) that changes the top plate 83 (portion supporting the boom 20) to an arbitrary height. .

With this [Configuration 4], the following effects can be obtained when the boom 20 is attached. When the top plate 83 supports the boom 20 (see FIG. 9D), the height of the boom 20 can be changed by the elevating cylinder 85 changing the height of the top plate 83. Therefore, it is possible to easily align the pin holes of the boom foot pins 20a (see FIG. 2). As a result, it is possible to easily insert the boom foot pin 20a.
When the undulating cylinder rod pin 19b is attached, the pin hole of the undulating cylinder rod pin 19b can be easily aligned by the above [Configuration 4].
With the above [Configuration 4], the following effects can be obtained when the boom 20 is removed. When the top plate 83 does not support the boom 20 (see the state between FIG. 9B and FIG. 9C), the lifting cylinder 85 raises the top plate 83, so that the boom rear end side support device 70. Can support the boom 20. Therefore, as shown in FIG. 9C, the boom foot pin 20a can be removed while the boom 20 is supported, so that the boom foot pin 20a can be reliably removed.

(Effect 5)
[Configuration 5] As shown in FIG. 2, a plurality of boom rear end side support devices 70 are provided at intervals in the boom extending and contracting direction X.

  With this [Configuration 5], the boom 20 can be supported more stably than when only one boom rear end side support device 70 is provided.

(Effect 6)
[Configuration 6] The boom support device 50 is provided on a truck 40 (transport carriage) for transporting the boom 20.

With this [Configuration 6], after the boom 20 is removed, the boom 20 can be transported by the truck 40 while the boom 20 is supported by the boom support device 50.
Further, according to [Configuration 6], when the truck 40 transports the boom 20 with the boom 20 supported by the boom support device 50 before the boom 20 is attached, the boom 20 remains in the state of the boom 20 during transportation. 20 installation operations can be started.

(Effect 7 (Eighth Invention))
The effects of the boom detaching method of the present embodiment are as follows. This boom attaching / detaching method is used for a crane 10 including a boom 20 shown in FIG. The boom 20 is attached to the upper swing body 13 via a boom foot pin 20a so as to be raised and lowered, and is extendable.
[Configuration 7] In a state where the boom 20 is supported on the boom tip side X2 with respect to the upper swing body 13 and the connection of the upper swing body 13 and the boom 20 by the boom foot pin 20a is disconnected, Extend and retract. By this expansion / contraction operation, the end of the boom 20 on the boom rear end side X1 is moved in the boom expansion / contraction direction X.
With this [Configuration 7], the same effect as the “(Effect 1)” can be obtained.

(Second Embodiment)
With reference to FIGS. 10-11F, the difference with 1st Embodiment is demonstrated about the boom removal | desorption apparatus 201 of 2nd Embodiment shown in FIG. In addition, about the common point with 1st Embodiment among the boom attaching / detaching apparatuses 201, the code | symbol same as 1st Embodiment was attached | subjected and description was abbreviate | omitted.

  As shown in FIG. 1, in the first embodiment, the lower traveling body 11 includes the crawler 11a. However, in the second embodiment, the lower traveling body 211 (lower body) is the crawler 11a (as shown in FIG. 10). 1) is not provided. The lower traveling body 211 includes a car body 211b and a jack 211c.

The car body 211b is a part to which the crawler 11a (see FIG. 1) is attached.
The jack 211c (translifter) is a hydraulic jack (hydraulic cylinder) attached to the car body 211b. The jack 211c lifts the upper swing body 13 to an arbitrary height. More specifically, the jack 211c can arbitrarily change the height of the upper swing body 13 with respect to the ground by lifting the car body 211b with respect to the ground, and can arbitrarily tilt the upper swing body 13 with respect to the ground. It is possible to change. The jacks 211c are provided at a plurality of locations, specifically at four locations, and are arranged at intervals in the boom expansion / contraction direction X and the boom width direction Y.

(Boom removal method)
As shown in the order of FIGS. 11A to 11F, the boom 20 is removed from the upper swing body 13. As shown in the order of FIGS. 11F to 11A, the boom 20 is attached to the upper swing body 13. The difference between the boom detaching method of the second embodiment and the first embodiment is as follows.

(Removal of the boom 20)
As shown in FIG. 9C, in the first embodiment, when the boom 20 is removed, the boom 20 is lowered to support the tip boom 25 by the boom tip side support device 60.
On the other hand, in the second embodiment illustrated in FIG. 10, for example, the boom tip side support device 60 cannot support the tip boom 25 simply by lowering the boom 20 because the loading platform 41 is lower than the first embodiment. . Therefore, as shown in FIG. 11C, the height of the upper swing body 13 with respect to the ground is adjusted by the jack 211c, and the inclination of the upper swing body 13 with respect to the ground is adjusted. More specifically, the rear side (boom rear end side X1) portion is lifted higher than the front side (boom front end side X2) portion of the upper swing body 13. Thereby, the front end boom 25 is supported by the boom front end side support device 60.

(Attaching the boom 20)
In the first embodiment, when the boom 20 is attached, the height of the first boom rear end side support device 71 shown in FIG. 9C is adjusted, whereby the pin hole of the boom foot pin 20a and the undulating cylinder rod pin 19b. The pin holes of each were aligned in the vertical direction.
On the other hand, in the second embodiment, for example, the position of the pin hole does not match only by adjusting the height of the first boom rear end side support device 71. Therefore, as shown in FIG. 11C, the height and inclination of the upper swing body 13 are adjusted by the jack 211c. Thereby, the vertical alignment of the pin hole of the boom foot pin 20a and the pin hole of the undulating cylinder rod pin 19b is performed.

(Effect 8 (seventh invention))
The effects of the boom detaching apparatus 201 shown in FIG. 10 are as follows. The boom detaching device 201 includes a jack 211c.
[Configuration 8] The jack 211c lifts the upper swing body 13 to an arbitrary height.

With this [Configuration 8], the following effects can be obtained when the boom 20 is removed. The boom 20 attached to the upper swing body 13 can be changed to an arbitrary height by lifting the upper swing body 13 to an arbitrary height by the jack 211c. Accordingly, the boom support device 50 can appropriately support the boom 20.
With the above [Configuration 8], the following effects can be obtained when the boom 20 is attached. The position of the pin hole of the boom foot pin 20a (of the boom support bracket 15a) of the upper swing body 13 can be changed to an arbitrary height by lifting the upper swing body 13 to an arbitrary height by the jack 211c. Therefore, the boom foot pin 20a can be easily attached.

(Modification)
Each of the above embodiments may be variously modified.
The crane 10 shown in FIG. 1 may be a wheel type.
Although the number of stages of the unit boom of the boom 20 shown in FIG. 2 is four, the number of stages may be two, three, or five or more.
In the above embodiment, the boom support device 50 is provided on the truck 40. However, the boom support device 50 may be provided on a transport carriage other than the truck 40, for example, may be provided on a trailer, or may be provided on, for example, a carriage dedicated to the transport of the boom 20, and is integrated with the carriage. But you can. Further, the boom support device 50 may not be provided on the transport carriage, and may be fixed to the ground surface, the floor surface, or the like.
In the above embodiment, the boom support device 50 is a device, but a part or all of the boom support device 50 may be a boom support unit that is not a device. The boom support unit that is not a device may be a block-like object, such as a tree.

As shown in FIG. 3, the boom tip side support device 60 supported the tip sheave fixing pin 25 c of the tip boom 25. However, the boom tip side support device 60 may support a portion other than the tip sheave fixing pin 25c, for example, may support the side plate 25a, and may support the lower end portion of the side plate 25a, for example. Further, the boom tip side support device 60 may support a unit boom (except for the base end boom 21) other than the tip boom 25.
The horizontal member 55 and the reinforcing member 63 may not be provided. Similarly, some of the components of the above embodiment may not be provided.

As shown in FIG. 2, the number of boom rear end side support devices 70 is two, but may be one or three or more.
The boom rear end side support device 70 may be configured such that the height cannot be adjusted, and may be configured by, for example, a non-nested box-like member.
The boom rear end side support device 70 may not be movable in the boom expansion / contraction direction X, and may be fixed to the frame 51 or the loading platform 41, for example.
The boom rear end support device 70 may be provided with a load detection means for detecting the load of the boom 20. With this load detection means, when the boom foot pin 20a shown in FIG. 9C is removed, it can be detected whether or not the boom rear end side support device 70 is supporting the boom 20 appropriately. When the elevating cylinder 85 shown in FIG. 6 is a hydraulic cylinder, this load detecting means is, for example, a hydraulic sensor that detects the pressure of hydraulic oil supplied to the hydraulic cylinder. This load detection means may be a load cell or the like.
In the above embodiment, the height of the top plate 83 is changed by the elevating cylinder 85 that is a hydraulic cylinder. However, the height of the top plate 83 may be changed using electric power by an electric motor or the like, for example.

  In the said embodiment, the boom rear end side support apparatus 70 was made movable in the boom expansion-contraction direction X by arrange | positioning the wheel 88 on the rail 53. FIG. However, the wheel 88 may be replaced with a sliding member, for example. The sliding member is configured to be slippery with respect to the rail 53, and is, for example, a plate shape (sliding pad), and is made of, for example, resin. The wheel 88 and the sliding member may not be disposed on the rail 53, and may be disposed on the side of the rail 53 (outside or inside the boom width direction Y) or in a groove formed in the rail 53.

The procedure of removing the boom 20 from the upper swing body 13 and the procedure of attaching the boom 20 to the upper swing body 13 in the above embodiment may be changed as appropriate.
In the second embodiment, the inclination of the upper swing body 13 with respect to the ground is adjusted by the jack 211c, but only the height may be adjusted without adjusting the inclination.

  As shown in FIG. 2, in the above embodiment, the boom 20 is attached to and detached from the upper swing body 13 in a state where the hoisting cylinder 19 is connected to the upper swing body 13. However, the boom 20 may be attached to and detached from the upper swing body 13 while the hoisting cylinder 19 is connected to the boom 20 and disconnected from the upper swing body 13.

1,201 Boom detaching device 10 Crane (mobile crane)
13 Upper revolving body 20 Boom 20a Boom foot pin 40 Truck (conveyance carriage)
50 Boom support device (boom support)
53 rail 60 boom tip side support device (boom tip side support part)
70 Boom rear end support device (boom rear end support)
71 1st boom rear end side support device (first boom rear end side support part)
72 Second boom rear end side support device (second boom rear end side support portion)
85 Lifting cylinder (support height changing part)
211c Jack X Boom telescopic direction X1 Boom rear end side X2 Boom front end side

Claims (8)

A boom that is retractably attached to the upper swing body via a boom foot pin, and is extendable and retractable.
A boom support portion disposed on the boom tip side from the upper swing body,
With
The boom support portion is configured such that a rear end portion of the boom is movable in a boom extending / contracting direction when the boom expands / contracts in a state where the connection between the upper swing body and the boom by the boom foot pin is disconnected. So as to support the boom,
Crane boom desorption device. The crane boom detaching device according to claim 1,
The boom support part is
A boom tip side support,
A boom rear end side support portion disposed closer to the boom rear end side than the boom front end side support portion;
A crane boom detaching apparatus comprising: A crane boom detaching device according to claim 2,
The boom support part includes a rail extending in a boom extending / contracting direction,
The boom rear end side support portion is movable along the rail in a boom extending / contracting direction,
Crane boom desorption device. A crane boom detaching device according to claim 2 or 3,
The boom rear end side support portion includes a support height changing portion that changes a portion supporting the boom to an arbitrary height.
Crane boom desorption device. A crane boom detaching device according to any one of claims 2 to 4,
A plurality of the boom rear end side support portions are provided at intervals in the boom expansion and contraction direction.
Crane boom desorption device. A crane boom detaching device according to any one of claims 1 to 5,
The boom support portion is provided on a transport carriage for transporting the boom.
Crane boom desorption device. A crane boom detaching device according to any one of claims 1 to 6,
A jack for lifting the upper swing body to an arbitrary height;
Crane boom desorption device. A crane boom attaching and detaching method, wherein the crane is provided with a boom that is telescopically attached to the upper swing body via a boom foot pin, and includes an extendable boom.
The boom is extended and retracted in a state where the boom is supported on the boom tip side of the upper swing body and in a state where the connection of the upper swing body and the boom by the boom foot pin is disconnected. , Moving the rear end of the boom in the boom expansion / contraction direction,
Crane boom removal method.