JP2017095238A - crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crane that is able to attach/detach an additional sheave by means of fewer components and is also able to easily restrict axial displacement of a support shaft from a support part.SOLUTION: A crane comprises an attachment. The attachment comprises a pair of support parts 70, a support shaft 72, a permanent sheave 59, an additional sheave unit 73, a separation preventing member 76, and a restricting member. The support shaft 72 has a permanent fitting part 72a and a fitting end part 72b. The additional sheave unit 73 restricts axial displacement of the support shaft 72 by its being interposed between the separation preventing member 76 and the support part 70 or permanent sheave 59. The restricting member restricts axial displacement of the support shaft 72 by its being interposed between the separation preventing member 76 and the support part 70 or permanent sheave 59, and has weight less than that of the additional sheave unit 73.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a crane.

  Generally, a crane includes a crane body and an attachment that can be raised and lowered with respect to the crane body and suspends a suspended load. The attachment includes a hoisting member such as a boom, a plurality of top sheaves attached to the hoisting member, a plurality of hook sheaves, a hook connected to the hook sheave, and a rope hung between each top sheave and each hook sheave. Have. The lifting and lowering of the suspended load with this crane is performed by winding and unwinding the rope.

  In such a crane, when the hoisting member is relatively upright from the crane body, it is possible to lift and lower a heavy load (having a high lifting capacity), while the hoisting member is in relation to the crane body. When the posture is relatively inclined, it is desirable that the weight of the entire attachment can be reduced. In other words, it is desirable that the crane can be switched between a state having a large lifting capacity and a state in which the weight of the attachment is reduced.

  Patent Document 1 discloses a crane that can meet such needs. In this crane, the number of sheaves can be changed. For this reason, the number of sheaves can be increased by increasing the number of sheaves in the posture in which the undulating member is relatively upright, that is, the lifting ability can be increased, and the number of sheaves is decreased in the posture in which the undulating member is relatively inclined. As a result, the weight of the attachment can be reduced. Specifically, the crane described in Patent Document 1 includes a boom top provided at the upper end of the boom, a support shaft supported by the boom top, a plurality of top sheaves supported by the support shaft, and an additional sheave block. And. The additional sheave block includes an additional sheave and an outer support member and an inner support member that support the additional sheave. Each support member supports the additional sheave from both sides in the axial direction, and is configured to be detachably connectable to an end portion of the support shaft (a portion of the support shaft outside the boom top). That is, the number of sheaves is increased or decreased by attaching / detaching the support member to / from the end of the support shaft.

JP 2006-273383 A

  In the crane of Patent Document 1, many members such as a support member are required to attach the additional sheave, and even if a retaining member is connected to the end of the support shaft, the support shaft is not attached to the boom top. Displacement in the axial direction of the support shaft cannot be restricted. Specifically, the axial dimension of the protruding portion that protrudes outward from the boom top of the support shaft is set to a size that allows the protruding portion to support the additional sheave block. Even if the retaining member is connected to the end of the shaft, the support shaft can be displaced in the axial direction with respect to the boom top by the axial dimension of the protruding portion. For this reason, a special structure for regulating this displacement is required.

  An object of the present invention is to provide a crane capable of attaching and detaching an additional sheave with a small number of parts and easily suppressing displacement in the axial direction with respect to a support portion of a support shaft.

  As means for solving the above-mentioned problems, the present invention comprises a crane body and an attachment connected to the crane body for suspending a suspended load, and the attachment can be raised and lowered with respect to the crane body. A hoisting member, a rope for lifting a suspended load, a pair of support portions provided on the hoisting member, a support shaft supported by the pair of support portions, and being rotatable with respect to the support shaft A permanent sheave that is attached to the support shaft so that the rope can be wound around, and can be attached to the support shaft so as to be rotatable with respect to the support shaft. An additional sheave unit that can be wound around, a retaining member that can be detachably connected to the support shaft, and the support shaft that can be attached to the support shaft and the support shaft is the pair of support portions A restricting member for restricting displacement in the axial direction of the support shaft, and the support shaft has a permanent mounting portion for mounting the permanent sheave, and the pair of support portions of the support shaft. An additional end of the additional sheave unit, including an end positioned on one side of the support shaft, and an attachment end for mounting either the additional sheave unit or the restricting member. And the regulating member can be detachably attached to the attachment end, and the retaining member can be detachably connected to the attachment end and is connected to the attachment end. The additional sheave unit or the regulating member is prevented from being detached from the attachment end, and the additional sheave unit is interposed between the retaining member and the support portion or the permanent sheave. The displacement of the support shaft in the axial direction is restricted, and the restriction member restricts the displacement of the support shaft in the axial direction by being interposed between the retaining member and the support portion or the permanent sheave. And a crane having a weight less than the weight of the additional sheave unit.

  With this crane, an additional sheave unit can be attached to the mounting end, so it is possible to attach an additional sheave unit with fewer parts than before, and an additional sheave unit is attached to increase the lifting capacity. When the restriction member is attached to reduce the weight of the entire attachment, the displacement of the support shaft in the axial direction is restricted. Specifically, the additional sheave unit is interposed between the retaining member and the support portion or the permanent sheave, thereby restricting the displacement of the support shaft in the axial direction while improving the lifting ability. On the other hand, since the regulating member has a weight smaller than that of the additional sheave unit, when the additional sheave unit is attached to the attachment end by interposing between the retaining member and the support portion or the permanent sheave, The axial displacement of the support shaft is restricted while reducing the weight of the entire attachment. Note that “regulation” here does not mean that no axial displacement of the support portion of the support shaft is allowed, but an allowable range in which the displacement amount of the support shaft in the axial direction is set in advance. It means that the displacement is regulated so as to be within.

  In this case, the support portion supports a portion of the support shaft between the permanent mounting portion and the mounting end portion, and restricts displacement of the permanent sheave to the mounting end portion. It is preferable.

  If it does in this way, both support of a spindle and prevention of detachment of a permanent sheave are achieved by a support part.

  In the present invention, the additional sheave unit includes an additional sheave on which the rope can be wound, and a spacer member that can be detachably attached to the attachment end, and the spacer member Preferably, the displacement of the additional sheave in the axial direction is restricted by being interposed between the retaining member and the support portion.

  In this aspect, by adjusting the dimension of the spacer member in the axial direction of the support shaft, the displacement of the support shaft in the axial direction with respect to the pair of support portions can be more reliably regulated.

  In the present invention, the attachment further includes another additional sheave different from the additional sheave, another retaining member different from the retaining member, and another regulating member different from the regulating member. The support shaft is an end portion of the support shaft that is located outside the pair of support portions and on a side different from the attachment end portion, and is any of the other additional sheaves and the other restriction members. It is preferable to further have another attachment end for attaching one of them.

  In this aspect, it is possible to add an additional sheave and other additional sheaves to both ends of the support shaft, respectively, so that the lifting ability can be greatly increased.

  As described above, according to the present invention, it is possible to attach and detach an additional sheave with a small number of parts and to provide a crane that can easily suppress displacement in the axial direction with respect to a support portion of a support shaft. Can do.

It is a side view of the crane of one embodiment of the present invention. It is sectional drawing which shows the state (high-capacity state) where the additional sheave unit was attached to the spindle. It is sectional drawing which shows the state (reduced state) in which the control member was attached to the spindle. It is an enlarged view of the vicinity of an additional sheave unit. It is an enlarged view of the vicinity of a control member.

  A crane 10 according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an overall configuration of a crane 10 of the present embodiment. The crane 10 includes a turning body 12 corresponding to a crane body, a traveling body 14 that supports the turning body 12 so as to be turnable, and an attachment. The attachment includes a hoisting member that includes a boom 16 and a jib 18. A counterweight 13 is loaded on the rear portion of the revolving structure 12. The crane 10 of this embodiment can change the lifting capacity of the attachment. This point will be described later.

  The boom 16 shown in the drawing is a so-called lattice type, and includes a base end side member 16A, one or a plurality of (two in the illustrated example) intermediate members 16B and 16C, and a front end side member 16D. Specifically, the base end side member 16 </ b> A is connected to the front portion of the revolving body 12 so as to be rotatable in the undulation direction. The intermediate members 16B and 16C are detachably added to the distal end side of the base end side member 16A in that order. The distal end side member 16D is detachably connected to the distal end side of the intermediate member 16C, and a rear strut 21 and a front strut 22 for rotating the jib 18 as described later are attached to the distal end portion of the distal end side member 16D. Are rotatably coupled.

  However, the specific structure of the boom is not limited in the present invention. For example, the boom may not have an intermediate member, and may have one or more intermediate members.

  Although the specific structure of the jib 18 is not limited, it has a lattice structure in the illustrated example. And the base end part of this jib 18 is connected with the front-end | tip part of said front end side member 16D so that rotation is possible, The rotation center axis | shaft of the said jib 18 is rotation of the said boom 16 with respect to the said rotary body 12. The horizontal axis is parallel to the central axis.

  The revolving body 12 is provided with a mast 20 having a base end and a rotation end. Specifically, the base end of the mast 20 is rotatably connected to the swivel body 12. The pivot axis is parallel to the pivot axis of the boom 16 and is located immediately behind the pivot axis of the boom 16. That is, the mast 20 can be rotated in the same direction as the undulation 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 revolving structure 12. These backstops 23 come into contact with the left and right sides of the base end side member 16A of the boom 16 when the boom 16 reaches the standing posture shown in FIG. To prevent it from being beaten backwards

  The rear strut 21 is held in a posture that protrudes from the tip of the tip side member 16D to the boom standing side (left side in FIG. 1). As means for maintaining this posture, a pair of left and right backstops 25 and a pair of left and right strut guy lines 26 are interposed between the rear strut 21 and the boom 16. The backstop 25 is interposed between the distal end side member 16D and the intermediate portion of the rear strut 21, and supports the rear strut 21 from below. The guy line 26 is stretched so as to connect the distal end portion of the rear strut 21 and the proximal end side member 16A, and the position of the rear strut 21 is regulated by the tension.

  The front strut 22 is connected to the jib 18 so as to rotate in conjunction with the jib 18. Specifically, a pair of left and right jib guy lines 28 are stretched so as to connect the front end portion of the front strut 22 and the front end portion of the jib 18. Accordingly, the jib 18 is also rotationally driven by the rotational driving of the front strut 22.

  Various winches are mounted on the crane 10. Specifically, a boom hoisting winch 30 for raising and lowering the boom 16, a jib hoisting winch 32 for rotating the jib 18 in the hoisting direction, and lifting and lowering a suspended load. The main winding winch 34 and the auxiliary winding winch 36 are mounted. In the crane 10 according to this embodiment, the boom hoisting winch 30 is installed in the vicinity of the base end of the mast 20. The jib hoisting winch 32, the main winding winch 34, and the auxiliary winding winch 36 are all installed on the base end side member 16 </ b> A of the boom 16. These winches 30, 32, 34, and 36 may be mounted on the revolving structure 12.

  The boom hoisting winch 30 winds and unwinds the boom hoisting rope 38. The boom hoisting rope 38 is routed so that the mast 20 is rotated by the 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 portion of the mast 20 and the rear end portion of the revolving body 12, respectively. The drawn boom hoisting rope 38 is stretched between the sheave blocks 40 and 42. Accordingly, when the boom hoisting winch 30 winds and unwinds the boom hoisting rope 38, the distance between the sheave blocks 40, 42 changes, and thereby the mast 20 and further interlock with the mast 20. The boom 16 rotates in the undulation direction.

The jib hoisting winch 32 winds and feeds the jib hoisting rope 44. Then, the jib hoisting rope 44 is routed so that the front strut 22 is rotated by the winding and feeding. Specifically, a guide sheave 46 is provided at the longitudinal intermediate portion of the rear strut 21, and a plurality of sheaves have a width at the rotating end portion of the rear strut 21 and the rotating end portion of the front strut 22. Sheave blocks 47 and 48 arranged in a direction are provided, and the jib hoisting rope 44 pulled out from the jib hoisting winch 32 is hung on the guide sheave 46 and hung between the sheave blocks 47 and 48. Passed. Therefore, the winding and unwinding of the jib hoisting rope 44 by the jib hoisting winch 32 changes the distance between the sheave blocks 47 and 48, and raises and lowers the front strut 22 and the jib 18 associated therewith. Rotate in the direction.

  The main winding winch 34 performs hoisting and lowering of the suspended load by the main winding rope 50. With respect to the main winding, main winding guide sheaves 52, 53, and 54 are rotatably provided in the vicinity of the proximal end of the rear strut 21, the vicinity of the proximal end of the front strut 22, and the tip of the jib 18, respectively. It has been. Further, a main winding sheave block 56 is provided at a position adjacent to the main winding guide sheave 54 (the tip of the jib 18). The main winding sheave block 56 has a plurality of main winding point sheaves 59 arranged in the width direction (see FIGS. 2 and 3). The main winding rope 50 drawn out from the main winding winch 34 is hooked in turn on the main winding guide sheaves 52, 53, 54, and also includes a main winding point sheave 59 and a main hook 57 for suspended loads. And hook sheave 58 provided in Accordingly, when the main winding winch 34 winds and feeds the main winding rope 50, the distance between the sheaves 59 and 58 changes, and the main hook 57 is wound and lowered.

  Similarly, the auxiliary winding winch 36 performs lifting and lowering of the suspended load by the auxiliary winding rope 60. With respect to this auxiliary winding, auxiliary winding guide sheaves 62, 63, 64 are rotatably provided coaxially with the main winding guide sheaves 52, 53, 54, respectively, at positions adjacent to the auxiliary winding guide sheave 64. An auxiliary winding point sheave is rotatably provided. The auxiliary winding rope 60 drawn out from the auxiliary winding winch 36 is hung on the auxiliary winding guide sheaves 62, 63, 64 in order, and is suspended from the auxiliary winding point sheave. Accordingly, when the auxiliary winding winch 36 winds or unwinds the auxiliary winding rope 60, a supplementary hook for unillustrated suspension connected to the end of the auxiliary winding rope 60 is wound or lowered. It is done.

  Next, the main winding sheave block 56 will be described in detail with reference to FIGS. 2 and 3 are front views of the main winding sheave block 56. FIG. The main winding sheave block 56 has a structure capable of changing the lifting ability as described below. FIG. 2 shows a high capacity state in which the lifting capacity is increased, and FIG. 3 shows a reduced state in which the weight of the entire attachment is reduced.

  As shown in FIGS. 2 to 5, the main winding sheave block 56 includes a pair of support portions 70, a support shaft 72, an additional sheave unit 73 (see FIGS. 2 and 4), and a retaining member 76. And a regulating member 90 (see FIGS. 3 and 5). In the main winding sheave block 56, either the additional sheave unit 73 or the regulating member 90 can be detachably attached to the end of the support shaft 72. By attaching the additional sheave unit 73 to the end of the support shaft 72, the attachment is in a state (high capacity state) having a high lifting ability. On the other hand, when the restriction member 90 is attached to the end of the support shaft 72, the weight of the entire attachment is reduced (reduced state). Further, regardless of which of the additional sheave unit 73 and the regulating member 90 is attached to the end portion of the support shaft 72, the axial displacement of the support shaft 72 with respect to the pair of support portions 70 is restricted. This will be specifically described below.

  The pair of support portions 70 are connected to the tip portion of the jib 18. Each support part 70 is arrange | positioned in the position mutually spaced apart in the direction parallel to the rotating shaft of the boom 16. As shown in FIG. Each support portion 70 is formed in a flat plate shape.

  The support shaft 72 is supported by a pair of support portions 70. Specifically, the support shaft 72 is supported by the pair of support portions 70 in a posture in which the axial direction of the support shaft 72 is parallel to the rotation shaft of the boom 16. The axial dimension of the support shaft 72 is set to be larger than the dimension between the pair of support portions 70. A plurality of (11 in this embodiment) main winding point sheaves 59 are attached to the support shaft 72. Since each main winding point sheave 59 is always attached to the support shaft 72, the main winding point sheave 59 is hereinafter referred to as "permanent sheave 59". The support shaft 72 has a permanent mounting portion 72a and a mounting end portion 72b.

  The permanent mounting portion 72 a is a part for mounting a plurality of permanent sheaves 59. In this embodiment, the site | part located between a pair of support parts 70 among the spindles 72 comprises the permanent attachment part 72a. The permanent mounting portion 72a is supported by a pair of partition walls 71 disposed between the pair of support portions 70 at positions separated from each other in the axial direction. In the present embodiment, four permanent sheaves 59 are respectively attached to portions of the permanent mounting portion 72a between the support portion 70 and the partition wall 71, and between the pair of partition walls 71 of the permanent mounting portion 72a. Three permanent sheaves 59 are attached to the site. Each support part 70 restricts the displacement of the permanent sheave 59 in the axial direction. In addition, between the permanent sheave unit consisting of four permanent sheaves 59 located between the support part 70 and the partition wall 71 and the support part 70, and between the permanent sheave unit and the partition wall 71, Each is provided with a spacer. Similarly, a spacer is provided between each partition wall 71 and a permanent sheave unit composed of three permanent sheaves 59 located between the pair of partition walls 71. These spacers restrict the displacement of the permanent sheave unit in the axial direction.

  The attachment end portion 72b is a part for attaching either the additional sheave unit 73 or the regulating member 90. In the present embodiment, a part of the support shaft 72 including an end portion located outside the pair of support portions 70 and on one side of the support shaft 72 constitutes the attachment end portion 72b.

  The retaining member 76 prevents the additional sheave unit 73 attached to the attachment end 72b or the restriction member 90 from being detached from the attachment end 72b. The retaining member 76 is formed in a flat plate shape, and is detachably connected to the attachment end portion 72b by a fastener 77 such as a bolt. The retaining member 76 has a shape that protrudes outward in the radial direction of the support shaft 72 from the outer peripheral surface of the mounting end 72b when the retaining member 76 is connected to the mounting end 72b.

  Here, the additional sheave unit 73 will be described with reference to FIGS. 2 and 4. The additional sheave unit 73 is for increasing the number of the main winding ropes 50 (the lifting ability) between the main winding sheave block 56 and the hook sheave 58. The additional sheave unit 73 can be detachably connected to the attachment end 72b. The additional sheave unit 73 regulates the displacement of the support shaft 72 in the axial direction by being interposed between the retaining member 76 and the support portion 70. Specifically, the additional sheave unit 73 includes an additional sheave 74 and a spacer member 75.

  The additional sheave 74 can be attached to the attachment end 72b so as to be rotatable with respect to the attachment end 72b, and can be wound around the main winding rope 50. The main winding rope 50 is wound around the additional sheave 74 in addition to each permanent sheave 59, so that the lifting ability is increased (high capacity state is achieved). The additional sheave 74 has a sheave body 74a and a bearing 74b interposed between the sheave body 74a and the attachment end 72b.

  The spacer member 75 can be detachably attached to the attachment end portion 72b. The spacer member 75 restricts the displacement of the additional sheave 74 in the axial direction by being interposed between the retaining member 76 and the support portion 70. Specifically, the spacer member 75 includes a first spacer 75 a interposed between the additional sheave 74 and the support portion 70, and a second spacer 75 b interposed between the additional sheave 74 and the retaining member 76. . Each spacer 75a, 75b is formed in a cylindrical shape. The inner end portion of the first spacer 75a is in contact with the outer surface of the support portion 70, and the outer end portion of the first spacer 75a is in contact with the inner surface of the bearing 74b. The inner end of the second spacer 75b is in contact with the outer surface of the bearing 74b, and the outer end of the second spacer 75b is in contact with the inner surface of the retaining member 76. That is, the spacer member 75 is interposed between the retaining member 76 and the support portion 70 together with the additional sheave 74, thereby restricting the axial displacement of the support shaft 72 with respect to the pair of support portions 70. Spacer member 75 may be formed integrally with additional sheave 74.

  In the present embodiment, the support shaft 72 further has another attachment end portion 72c including an end portion located outside the pair of support portions 70 and on the side different from the attachment end portion 72b. doing. Other additional sheave units 80 and other retaining members 82 can be detachably connected to the other attachment end 72c. The other additional sheave unit 80 has a structure that is symmetrical to the structure of the additional sheave unit 73 with respect to a reference plane that passes through the axial center of the support shaft 72 and is orthogonal to the support shaft 72. 82 has a structure symmetrical to the structure of the retaining member 76 with respect to the reference surface.

  Next, the regulating member 90 will be described with reference to FIGS. 3 and 5. The restricting member 90 is a member that restricts the support shaft 72 from being displaced in the axial direction with respect to the pair of support portions 70. The restriction member 90 can be detachably attached to the attachment end portion 72 b and has a weight smaller than that of the additional sheave unit 73. Specifically, the restricting member 90 has a main body portion 90a, an inner flange 90b, and an outer flange 90c.

  The main body 90a is formed in a cylindrical shape that allows insertion of the attachment end 72b. The inner flange 90b has a shape that protrudes outward in the radial direction from the inner end of the main body 90a. The inner flange 90 b is in contact with the outer surface of the support portion 70. The outer flange 90c has a shape projecting radially outward from the outer end of the main body 90a. The outer flange 90 c is in contact with the inner surface of the retaining member 76.

  In the present embodiment, the inner flange 90b is fixed to the support portion 70 by a fastener 91 such as a bolt, and the outer flange 90c is fixed to the retaining member 76 by a fastener 92 such as a bolt. A retaining member 76 is fixed to the support shaft 72, an outer flange 90 c is fixed to the retaining member 76, and the inner flange 90 b is fixed to the support portion 70, whereby the support shaft 72 is fixed to the pair of support portions 70. Relative rotation is restricted. For this reason, the occurrence of seizure between the support shaft 72 and the pair of support portions 70 is suppressed. The inner flange 90b and the outer flange 90c may be omitted. In this case, the inner end of the main body 90 a contacts the outer surface of the support 70 and the outer surface of the main body 90 a contacts the inner surface of the retaining member 76. Displacement is regulated.

  In the present embodiment, another restricting member 94 can be detachably connected to the other attachment end 72c. The other restricting member 94 has a structure symmetrical to the structure of the restricting member 90 with respect to the reference plane.

  As described above, in the crane 10 according to the present embodiment, the high sheave state and the reduced state can be switched by replacing the additional sheave unit 73 and the regulating member 90 with respect to the attachment end portion 72b. Specifically, in order to obtain a high-performance state, the first spacer 75a, the additional sheave 74, and the second spacer 75b are inserted in this order into the attachment end 75b, and then the retaining member 76 is attached to the attachment end 75b. Connecting. Thereby, the main winding rope 50 can be hung around the additional sheave 74 in addition to each permanent sheave 59 (the lifting ability can be increased). On the other hand, in order to switch from this state to the reduced state, the retaining member 76 and the additional sheave unit 73 are removed, and the restriction member 90 having a weight smaller than the weight of the additional sheave unit 73 is inserted into the attachment end portion 72b. A retaining member 76 is connected to the attachment end 72b. Thereby, compared with the case where the additional sheave unit 73 is attached to the attachment end 72b, the weight of the entire attachment can be reduced (reduced state).

  Further, the axial displacement of the support shaft 72 with respect to the pair of support portions 70 is suppressed in either the high capacity state or the reduced state. Specifically, the additional sheave unit 73 contacts both the inner side surface of the retaining member 76 and the outer side surface of the support portion 70, so that the displacement of the support shaft 72 is suppressed. On the other hand, since the regulating member 90 also contacts both the inner side surface of the retaining member 76 and the outer side surface of the support portion 70, the displacement of the support shaft 72 is suppressed.

  That is, the attachment of the additional sheave unit 73 to the attachment end portion 75b enables both the improvement of the lifting ability and the restriction of the displacement of the support shaft 72 in the axial direction. On the other hand, the attachment of the restriction member 90 to the attachment end portion 75b makes it possible to achieve both reduction in the weight of the entire attachment and restriction of the displacement of the support shaft 72 in the axial direction. Here, “regulation” does not mean that no displacement of the support shaft 72 in the axial direction with respect to the pair of support portions 70 is allowed, but the amount of displacement of the support shaft 72 in the axial direction is determined in advance. This means that the displacement is regulated so as to be within a set allowable range.

  Moreover, the support part 70 is supporting the site | part between the permanent attachment part 72a and the attachment end part 72b among the spindles 72, and regulates the displacement to the attachment end part 72b of the permanent sheave 59. FIG. For this reason, both the support of the support shaft 72 and the retaining of the permanent sheave 59 are achieved by the support portion 70.

  Further, since the additional sheave unit 73 includes the additional sheave 74 and the spacer member 75, the axial displacement of the support shaft 72 can be reduced by adjusting the dimension of the spacer member 75 in the axial direction. It is possible to regulate more reliably.

  Moreover, since this crane 10 can attach the other additional sheave unit 80 and the other control member 90 with respect to the other attachment edge part 72c, it becomes possible to increase lifting ability further.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, two or more additional sheaves 74 may be added to the attachment end portion 72b. That is, the dimension in the axial direction of the attachment end portion 72b may be set to a size that allows attachment of two or more additional sheaves 74. The same applies to the other attachment end portions 72c. Alternatively, the other additional sheave unit 80 and the other restricting member 94 may be omitted.

  Moreover, each support part 70 may be arrange | positioned between the outermost permanent sheave located in the outermost side among the some permanent sheaves 59, and the permanent sheave located in the one inside. In other words, a part of the permanent mounting portion 72 a may be formed outside the pair of support portions 70. In this case, the inner end portion of the additional sheave unit 73, the inner end portion of the restricting member 90, the inner end portion of the other additional sheave unit 80, and the inner end portion of the other restricting member 94 are respectively the outermost portions. Abuts the outer end of the permanent sheave.

  Further, the connection destination of the main winding sheave block 56 is not limited to the tip of the jib 18. The main winding sheave block 56 may be attached to the tip of the boom 16.

10 Crane 16 Boom 18 Jib 50 Main winding rope 56 Main winding sheave block 59 Main winding point sheave (permanent sheave)
70 Supporting portion 72 Support shaft 72a Permanent mounting portion 72b Mounting end portion 72c Other mounting end portion 73 Additional sheave unit 74 Additional sheave 75 Spacer member 76 Retaining member 80 Other additional sheave unit 82 Other retaining member 90 Restricting member 94 Other regulating members

Claims (4)

The crane body,
An attachment connected to the crane body for hanging a suspended load,
The attachment is
A hoisting member capable of hoisting with respect to the crane body;
A rope for lifting a suspended load;
A pair of support portions provided on the hoisting member;
A support shaft supported by the pair of support portions;
A permanent sheave attached to the support shaft so as to be rotatable with respect to the support shaft, and capable of being wrapped around the rope;
An additional sheave unit that can be attached to the support shaft so as to be rotatable with respect to the support shaft, and the rope can be wound around;
A retaining member that is detachably connectable to the spindle;
A restricting member that is attachable to the support shaft and restricts the support shaft from being displaced in the axial direction of the support shaft with respect to the pair of support portions;
The spindle is
A permanent mounting portion for mounting the permanent sheave;
A mounting end portion for mounting either the additional sheave unit or the regulating member, which is a portion including an end portion located outside the pair of support portions and on one side of the support shaft among the support shafts. And having
The additional sheave unit and the restricting member can be detachably attached to the attachment end.
The retaining member is detachably connectable to the mounting end, and prevents the additional sheave unit or the regulating member from being detached from the mounting end when connected to the mounting end. And
The additional sheave unit regulates displacement of the support shaft in the axial direction by being interposed between the retaining member and the support portion or the permanent sheave,
The restricting member restricts displacement of the support shaft in the axial direction by being interposed between the retaining member and the support portion or the permanent sheave, and is smaller than the weight of the additional sheave unit. A crane with weight. The crane according to claim 1,
The said support part is a crane which supports the site | part between the said permanent attachment part and the said attachment edge part among the said spindles, and regulates the displacement to the said attachment edge part of the said permanent sheave. The crane according to claim 2,
The additional sheave unit is
An additional sheave on which the rope can be hung around;
A spacer member detachably attached to the attachment end,
The said spacer member is a crane which regulates the displacement to the said axial direction of the said additional sheave by interposing between the said retaining member and the said support part. The crane according to any one of claims 1 to 3,
The attachment is
Another additional sheave unit different from the additional sheave unit;
Other retaining members different from the retaining members,
A further restriction member different from the restriction member,
The support shaft is an end portion of the support shaft that is located outside the pair of support portions and on a side different from the attachment end portion, and is either the other additional sheave unit or the other restriction member. A crane further comprising another attachment end for attaching one.

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