Spreader

Abstract

To automate the task of removing a sling rope from a suspended load with a simple configuration. [Solution] The connecting part 51 is attached to the hoisting balance 23. The moving part 60 is arranged on the lower side Z2 than the hoisting balance 23, and is connected to the hoisting balance 23 by the connecting part 51. The connecting part 51 is configured to convert the movement of the hoisting balance 23 toward the lower side Z2 into the movement of the moving part 60 toward the lifting side (X1) when the moving part 60 is in contact with the upper surface (11a) of the suspended load 11. The moving part 60 is configured to push the sling rope 25 toward the lifting side (X1) when it moves to the lifting side (X1) while in contact with the upper surface (11a) of the suspended load 11.

Description

[Technical field]

[0001] The present invention relates to a hoisting device for suspending a load. [Background technology]

[0002] For example, Patent Document 1 describes a conventional hoisting device. In the hoisting device described in this document, a hoisting hook is suspended from a hoisting beam (hoisting balance) via a hoisting rope, and a sling wire (sling rope) is suspended from the hoisting hook, and the sling wire is hooked onto a long material (suspended load). In the hoisting device described in this document, the sling wire automatically comes off the hoisting hook. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-300689 A Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, it is desirable to automate the task of removing a sling rope from a suspended load using a simple configuration.

[0005] Therefore, an object of the present invention is to provide a lifting device that can automate the ball removal process with a simple configuration. [Means for solving the problem]

[0006] The hoisting device includes a hoisting scale, a sling rope, a connecting part, and a moving part. The hoisting scale is for stabilizing the posture of a suspended load. The sling rope is suspended from the hoisting scale and can be draped over the suspended load. The connecting part is attached to the hoisting scale. The moving part is disposed below the hoisting scale and is connected to the hoisting scale by the connecting part. A direction intersecting the vertical direction and in which the sling rope is removed from the suspended load is defined as a sling removal side. The connecting part is configured to convert the movement of the hoisting scale downwards into the movement of the moving part toward the sling removal side when the moving part is in contact with the upper surface of the suspended load. The moving part is configured to push the sling rope toward the sling removal side when it moves to the sling removal side while in contact with the upper surface of the suspended load. Effect of the Invention

[0007] The above-mentioned lifting tool can automate the ball removal process with a simple configuration. [Brief description of the drawings]

[0008] [Figure 1] 1 is a view of a hoisting device 1 including a hoisting tool 20 as viewed from the lateral direction Y. [Diagram 2] 1 in a state where the moving part 60 shown in FIG. 1 is in contact with the suspended load 11, as viewed from the lateral direction Y. FIG. [Diagram 3] 2 is a diagram of the moving part 60 shown in FIG. 1 as viewed from the upper side Z1. [Figure 4] 2, showing a state in which the moving part 60 shown in FIG. 2 has moved to the front side X1 from the state shown in FIG. [Diagram 5] 4, showing a state in which the hanging balance 23 shown in FIG. 4 has been moved to an upper side Z1 from the state shown in FIG. [Figure 6] 5, showing a state in which the hanging balance 23 shown in FIG. 5 has been moved to an upper side Z1 from the state shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A hoisting device 1 equipped with a hoisting tool 20 will be described with reference to Figs. 1 to 6.

[0010] 1, the hoisting device 1 is a device that hoists and moves a load 11. For example, the hoisting device 1 may be a device that moves the load 11 on a quay or within a ship's hold, a device that moves the load 11 within a building, or a device that moves the load 11 at a construction site or the like. The hoisting device 1 includes the load 11, a main rope 13, a main hook 15, and a hoisting tool 20.

[0011] The load 11 is suspended by the hoist 20. The load 11 has a shape that allows a sling rope 25 to be hung on the lower Z2 portion of the load 11. The load 11 is, for example, an object having a longitudinal direction (a long object, for example, long cargo). For example, the load 11 is rod-shaped or column-shaped (for example, rectangular column-shaped). The load 11 does not have to be an object having a longitudinal direction, and does not have to be rod-shaped. For example, the load 11 may be flat or block-shaped. The load 11 may be made of any material, and may be metal, wood, or resin. In one hoisting operation using the hoist 20, the number of loads 11 suspended by the hoist 20 may be one or more (multiple loads 11 may be suspended together by the hoist 20).

[0012] Specific examples of the load 11 are as follows. The load 11 may be a rod-shaped metal lump (billet) for manufacturing a metal product (e.g., metal wire rod, etc.). The number of loads 11 suspended by the hoist 20 in one hoisting operation may be a total of ten loads 11, five in the horizontal direction Y (details of the direction will be described later) and two rows in the vertical direction Z. The length of the loads 11 in the longitudinal direction may be approximately 11.5 m. The cross section of the load 11 as viewed in the longitudinal direction may be approximately rectangular (one load 11 may be an approximately rectangular column). The length of each of the four sides of the approximately rectangular shape may be approximately 75 mm. The mass of one load 11 may be approximately 2.2 tons. The mass of the ten loads 11 suspended by the hoist 20 in one hoisting operation may be approximately 22 tons. The dimensions, shape, material, number of loads 11 suspended in one lifting operation, etc. can be set in various ways. For example, the load 11 does not have to be a billet. In the following, when multiple loads 11 are suspended by the lifting tool 20 in one lifting operation, the multiple loads 11 will be simply referred to as "loads 11." The load 11 has a load upper surface 11a.

[0013] The suspended load upper surface 11a is the upper surface (surface on the upper side Z1) of the suspended load 11. The suspended load upper surface 11a has a shape that allows the moving part 60 described later to move on the suspended load upper surface 11a. The suspended load upper surface 11a has, for example, a flat shape (planar or approximately planar). The suspended load upper surface 11a is disposed so as to extend in the horizontal direction or approximately horizontal direction. Note that the suspended load upper surface 11a does not have to have a flat shape as long as the moving part 60 can move on the suspended load upper surface 11a. For example, the suspended load upper surface 11a may include a curved surface, a step, or unevenness.

[0014] The main rope 13 is a wire rope that suspends the main hook 15. The main rope 13 is a component of the crane.

[0015] The main hook 15 is suspended from the main rope 13. The main hook 15 is a component of the crane. A hoisting device 20 is hung from the main hook 15. The winch of the crane winds and unwinds the main rope 13, thereby hoisting (moving to the upper side Z1) and lowering (moving to the lower side Z2).

[0016] The hoisting device 20 is a device for hoisting a load 11. The hoisting device 20 is suspended by a main rope 13 and a main hook 15. The hoisting device 20 includes a sling 21, a hoisting balance 23, a sling rope 25, and an automatic sling release machine 30.

[0017] The directions related to this sling 20 include a front-rear direction X, a lateral direction Y, and a top-down direction Z. The top-down direction Z is a vertical direction. In the top-down direction Z, the top in the vertical direction (the direction in which the main hook 15 is wound up) is the upper side Z1, and the opposite side to the upper side Z1 is the lower side Z2. The front-rear direction X is a direction in which the sling rope 25 is attached to and detached from the load 11. The front-rear direction X intersects (for example, perpendicular to) the up-down direction Z. As shown in FIG. 2, in the front-rear direction X, the direction in which the sling rope 25 is removed from the load 11 is the front side X1 (sling removal side). More specifically, the front side X1 is the direction in which the sling rope 25 (more specifically, the lower part 25e of the sling rope) moves when the sling rope 25 is removed from the load 11. The opposite side of the front side X1 in the front-rear direction X is the rear side X2 (opposite to the sling removal side, sling side). For example, when the load 11 and the hoist 23 have a longitudinal direction, the front-rear direction X may be the longitudinal direction of the load 11 or the longitudinal direction of the hoist 23. In this case, the front side X1 may be the outer side in the longitudinal direction of the load 11 or the outer side in the longitudinal direction of the hoist 23. As shown in Fig. 1, the lateral direction Y is a direction (left-right direction) that intersects (for example, is perpendicular to) each of the up-down direction Z and the front-rear direction X.

[0018] The sling 21 connects the main hook 15 and the hoist 23. A plurality of slings 21 are provided, two in the example shown in Fig. 1, but three or more slings may be provided. The sling 21 may include a wire rope, a chain, or a belt (a rope having a rectangular cross section).

[0019] The hoist 23 (e.g., a hoisting beam) is for stabilizing the posture of the suspended load 11. The hoist 23 is for suspending the suspended load 11 horizontally or approximately horizontally. More specifically, the hoist 23 is for suspending the suspended load 11 in a posture in which the suspended load upper surface 11a extends horizontally or approximately horizontally. The hoist 23 serves as a power source for the moving unit 60 (described later). The hoist 23 is suspended from the main hook 15 via the sling 21. The hoist 23 is a hoisting beam equipped with a beam. In the example shown in FIG. 1, the hoist 23 is equipped with only one beam. The hoist 23 may be equipped with multiple beams. In this case, the hoist 23 may be, for example, approximately X-shaped (approximately cross-shaped), approximately rectangular, or approximately H-shaped when viewed from the up-down direction Z. The beam of the hanging balance 23 is disposed so as to extend horizontally or approximately horizontally (the beam is a horizontal beam). As shown in Fig. 2, the hanging balance 23 includes, for example, a hanging balance bottom plate 23a.

[0020] The hanging balance bottom plate 23a is a plate provided on the lower side Z2 portion of the hanging balance 23. The hanging balance bottom plate 23a is disposed so as to extend in the horizontal direction or approximately in the horizontal direction.

[0021] As shown in FIG. 1, the sling rope 25 is suspended (hanging, drooping) from the hoist 23. The sling rope 25 can be hung around the suspended load 11. The sling rope 25 can be in a slinging state with respect to the suspended load 11 and in a released state (see FIGS. 4 to 6). The "slinging state" is a state in which the sling rope 25 is hung around the lower Z2 portion of the suspended load 11. The "released state" is a state in which the sling rope 25 is released from the suspended load 11 (see FIGS. 4 to 6). The sling rope 25 is arranged to extend in the up-down direction Z when the sling rope 25 is in a state in which it is hoisting the suspended load 11 (referred to as a "load hoisting state").

[0022] This sling rope 25 is a rope, for example a wire rope (sling wire, sling wire rope). A plurality of sling ropes 25 are provided. In the example shown in FIG. 1, the sling ropes 25 are provided in two locations. For example, the sling ropes 25 are suspended from both ends of the hoist 23 in the front-rear direction X. For example, the sling ropes 25 are positioned so that they can be hung on both ends of the load 11 in the front-rear direction X. The sling ropes 25 may be provided in three or more locations. Below, a description is given of one of the plurality of sling ropes 25.

[0023] This sling rope 25 may be a single rope-like member (single piece), or may be a piece in which multiple members are connected as in the example shown in Fig. 2. Focusing on the structure of the sling rope 25, the sling rope 25 comprises a sling rope first portion 25a, a sling rope second portion 25b, and a sling rope third portion 25c. Focusing on the function of the sling rope 25, the sling rope 25 comprises a sling rope lower portion 25e and a sling rope upper middle portion 25f.

[0024] The sling rope first portion 25a is connected to the hoist balance 23 and suspended from the hoist balance 23. The sling rope first portion 25a is provided on each side (left and right) in the lateral direction Y (two in total). The length of the sling rope first portion 25a is, for example, about 1 m (this "about 1 m" is just an example).

[0025] The second sling rope portion 25b is connected to the tip (lower Z2 end) of the first sling rope portion 25a. The second sling rope portion 25b is connected to the tip of each of the first sling rope portions 25a on both sides (left and right) in the lateral direction Y (two in total are provided). The second sling rope portion 25b may be, for example, a hook, or may be detachable from the third sling rope portion 25c. The second sling rope portion 25b may be a ring-shaped member for connecting a rope.

[0026] The third sling rope portion 25c is connected to the second sling rope portion 25b. The third sling rope portion 25c is a rope that connects the second sling rope portions 25b on both sides (left and right) in the lateral direction Y. The third sling rope portion 25c is substantially U-shaped when viewed from the front-rear direction X (see FIG. 3). It is not necessary for the sling rope 25 to be composed of three portions, the first sling rope portion 25a, the second sling rope portion 25b, and the third sling rope portion 25c. For example, the sling rope 25 may be composed of two portions, or may be composed of four or more portions.

[0027] As shown in FIG. 1, the lower sling rope 25e is a portion that comes into contact with the lower Z2 portion of the load 11 when the sling rope 25 is in a load-lifting state. In the following, unless otherwise specified, a case where the sling rope 25 is in a load-lifting state will be described. The lower sling rope 25e is a portion that supports the load 11 from the lower Z2. The lower sling rope 25 is a portion that becomes the lower Z2 end portion of the sling rope 25. The lower sling rope 25e may be belt-shaped (rope-shaped with a rectangular cross section) or may be shaped with a substantially circular cross section. Specifically, the lower sling rope 25e is the lower Z2 portion of the sling rope third portion 25c (see FIG. 2).

[0028] The upper middle sling rope 25f is a portion of the sling rope 25 that is on the upper side Z1 than the lower sling rope 25e. The upper middle sling rope 25f extends from the lower sling rope 25e to the upper side Z1. There are two upper middle sling ropes 25f, one on each side (left and right) in the lateral direction Y. Specifically, as shown in Fig. 2, the upper middle sling rope 25f is made up of the portion of the third sling rope portion 25c that is on the upper side Z1 than the lower sling rope 25e, the second sling rope portion 25b, and the first sling rope portion 25a.

[0029] The automatic slinging machine 30 is a device (slinging aid) that automatically removes the sling rope 25. The automatic slinging machine 30 is a device that automatically removes the sling rope 25, which is hung on the suspended load 11, from the suspended load 11. The automatic slinging machine 30 converts (utilizes) the movement of the hoisting balance 23 toward the lower side Z2 (specifically, the lowering) into the movement of the moving part 60 toward the front side X1, thereby removing the sling rope 25 (details will be described later). For example, when the suspended load 11 is a billet, the automatic slinging machine 30 is an automatic slinging machine for billet handling. As shown in FIG. 1, a plurality of automatic slinging machines 30 are provided, and in the example shown in FIG. 1, they are provided at two locations, but they may be provided at only one location, or they may be provided at three or more locations. In the example shown in FIG. 1, the automatic slinging machine 30 is hung from both sides of the hoisting balance 23 in the front-rear direction X. The following describes one of the automatic slinging machines 30. The automatic slinging machine 30 includes a bracket 40, a connecting portion 51, a moving portion suspending portion 55, a moving portion 60, a holding portion 71, and a sling rope retracting portion 73.

[0030] The bracket 40 is a member (mounting member, for example, a metal fitting) for mounting the automatic ball remover 30 to the hanging balance 23. The bracket 40 includes a connecting portion bracket 41, a holding portion bracket 43, and a moving portion hanging portion bracket 45.

[0031] The connecting part bracket 41 is a member for attaching the connecting part 51 to the hanging balance 23. The connecting part bracket 41 is a member for attaching the connecting part 51 to the hanging balance 23 so that the connecting part 51 is rotatable relative to the hanging balance 23 (see the explanation of the connecting part 51 for details of the rotation). In the example shown in Fig. 2, the connecting part bracket 41 includes a fixed bracket 41a, a rotating bracket 41b, and a swinging bracket 41c.

[0032] The fixed bracket 41a is fixed to the hanging balance 23. For example, the fixed bracket 41a is disposed so as to sandwich the hanging balance bottom plate 23a, and is fixed to the hanging balance bottom plate 23a. The fixed position (attachment position) of the fixed bracket 41a with respect to the hanging balance 23 may be adjustable (the same applies to the holding unit bracket 43 and the moving unit hanging unit bracket 45).

[0033] The rotating bracket 41b is attached to the fixed bracket 41a so as to be rotatable relative to the fixed bracket 41a in the front-rear direction X and the up-down direction Z. The rotating bracket 41b is rotatable about a rotation axis (a connecting portion rotation axis 51a described later) extending in the lateral direction Y relative to the hanging balance 23 (for example, relative to the fixed bracket 41a).

[0034] The swing bracket 41c is attached to the swing bracket 41b so as to be rotatable (swingable) in the lateral direction Y relative to the swing bracket 41b. The swing bracket 41c is rotatable about a rotation axis (a connecting part swing axis 51b described later) extending in the front-rear direction X relative to the hanging balance 23 (for example, relative to the swing bracket 41b).

[0035] The holding part bracket 43 is a member for attaching the holding part 71 to the hanging balance 23. The holding part bracket 43 is a member for attaching the holding part 71 to the hanging balance 23 so that the holding part 71 is rotatable relative to the hanging balance 23 (see the explanation of the holding part 71 for details of the rotation). In the example shown in Fig. 2, the holding part bracket 43 includes a diagonal member bracket 43a and a vertical member bracket 43b.

[0036] The diagonal bracket 43a is disposed so as to extend in a direction inclined with respect to the front-rear direction X. The diagonal bracket 43a is disposed so as to extend in a direction inclined with respect to the front-rear direction X so as to be disposed on the lower side Z2 as it approaches the rear side X2. In the example shown in FIG. 2, the diagonal bracket 43a is fixed to the hanging balance 23 by being fixed to the fixed bracket 41a. In this example, the fixed bracket 41a is used both as the connecting portion bracket 41 and the holding portion bracket 43. The diagonal bracket 43a may be fixed directly (without the fixed bracket 41a) to the hanging balance 23. In the example shown in FIG. 2, the diagonal bracket 43a has a truss structure including a plurality of rod-shaped members. The diagonal bracket 43a may be a single rod-shaped member or may include a plate-shaped member.

[0037] The vertical member bracket 43b is disposed so as to extend in the up-down direction Z. The vertical member bracket 43b is fixed to the diagonal member bracket 43a. The vertical member bracket 43b is disposed so as to extend downward Z2 from the rear side X2 end of the diagonal member bracket 43a.

[0038] The moving section hanging section bracket 45 is a member for attaching the moving section hanging section 55 to the hoist 23. The moving section hanging section bracket 45 is fixed to the hoist 23. The moving section hanging section bracket 45 is attached and fixed to the hoist 23 in the same manner as, for example, the fixed bracket 41a is attached and fixed to the hoist 23.

[0039] The connecting part 51 (e.g., an arm) connects the hoist 23 and the moving part 60. The connecting part 51 is configured to convert the movement of the hoist 23 toward the lower side Z2 into the movement of the moving part 60 toward the front side X1 (performs force conversion) when the moving part 60 is in contact with the suspended load upper surface 11a (details will be described later).

[0040] The connecting part 51 is attached to the hanging balance 23. For example, the connecting part 51 is attached to the lower side Z2 portion of the hanging balance 23. The connecting part 51 is attached to the connecting part bracket 41, and is attached to the hanging balance 23 via the connecting part bracket 41. For example, the connecting part 51 is attached to the swing bracket 41c. The connecting part 51 is arm-shaped (column-shaped). The connecting part 51 may have a shape that extends linearly (rod-shaped) when viewed from the horizontal direction Y, or may have a shape that extends in a curved line. The connecting part 51 may have a structure in which a plurality of rod-shaped members are combined. For example, the connecting part 51 may include two rod-shaped members (main pillars) arranged in the horizontal direction Y, and a member (connecting member) that connects the two rod-shaped members to each other in the horizontal direction Y. Also, for example, the connecting part 51 may be a single rod-shaped member. The connecting part 51 is rotatably attached to the hanging balance 23 (described later). The connecting portion 51 has a connecting portion rotating shaft 51a, a connecting portion swinging shaft 51b, and a connecting portion moving portion mounting position 51c.

[0041] The connecting part rotation shaft 51a is a rotation shaft of the connecting part 51 relative to the hanging balance 23 in the front-rear direction X and the up-down direction Z (details of rotation will be described later). The connecting part rotation shaft 51a extends in the lateral direction Y. In the example shown in Fig. 2, the connecting part rotation shaft 51a is a rotation shaft of the rotating bracket 41b relative to the fixed bracket 41a.

[0042] The connecting part swing shaft 51b is a rotation axis for rotation (swing) of the connecting part 51 relative to the hanging balance 23 in the lateral direction Y. The connecting part swing shaft 51b extends in the front-rear direction X. The extending direction of the connecting part swing shaft 51b may be inclined with respect to the front-rear direction X, for example, it may be inclined upward Z1 toward the front side X1. The connecting part 51 may be rotatable about an axis different from the connecting part rotation shaft 51a and the connecting part swing shaft 51b. Specifically, for example, a large gap (play) may be provided between an axis (e.g., a pin) for attaching the connecting part 51 to the hanging balance 23 and a hole (e.g., a pin hole) through which this axis passes.

[0043] The connecting part moving part attachment position 51c is a position where the connecting part 51 is attached to the moving part 60 (the attachment position of the connecting part 51 to the moving part 60) (described in detail later).

[0044] The moving part suspending part 55 (e.g., a hanging rope) supports the moving part 60 with respect to the hoist 23 as shown in Fig. 1. The moving part suspending part 55 suspends the moving part 60 from the hoist 23. The moving part suspending part 55 supports the moving part 60 in a state floating above the suspended load 11 so that the moving part 60 in a state floating above the suspended load 11 (positioned on the upper side Z1 above the suspended load 11) assumes a posture similar to that of the moving part 60 in a state in contact with the suspended load 11 (see Figs. 2, 4, etc.). For example, the moving part suspending part 55 supports the moving part 60 so that a moving part main body 61 (described later) is positioned to extend horizontally or approximately horizontally.

[0045] The moving part hanging part 55 is provided separately from the connecting part 51 (the moving part hanging part 55 is not the connecting part 51). The moving part hanging part 55 does not have a function of converting the movement of the hoist 23 to the lower side Z2 into movement to the front side X1 of the moving part 60. As shown in Fig. 2, the moving part hanging part 55 is attached to the moving part 60 at a moving part hanging part mounting part 61d (described later), which is a position different from the connecting part mounting part 61c (described later).

[0046] The moving part suspending part 55 is attached to the hoist 23. For example, the moving part suspending part 55 is attached to the moving part suspending part bracket 45, and is attached to the hoist 23 via the moving part suspending part bracket 45. The moving part suspending part 55 is, for example, rope-shaped (for example, a wire rope). The moving part suspending part 55 is arranged so as to extend in the up-down direction Z when the moving part suspending part 55 is in a state in which it supports the moving part 60. Specifically, the moving part suspending part 55 is a suspending rope arranged so as to hang down from the hoist 23 (arranged in a suspended state). The length of the moving part suspending part 55 is constant (strictly speaking, approximately constant).

[0047] The moving unit 60 moves to the front side X1 (sling removal side) while in contact with the suspended load upper surface 11a, thereby removing the sling rope 25 from the suspended load 11 (see FIG. 4). The movement of the moving unit 60 to the front side X1 while in contact with the suspended load upper surface 11a is referred to as "sling removal movement". The moving unit 60 is disposed on the lower side Z2 of the hoisting balance 23. For example, a part (or the entirety) of the moving unit 60 is disposed on the lower side Z2 of the hoisting balance 23 and in a position facing the hoisting balance 23 in the vertical direction Z (directly below the hoisting balance 23). The moving unit 60 is connected to the hoisting balance 23 by the connecting unit 51. The moving unit 60 includes a moving unit main body 61, a moving unit weight 63, a sling rope handling unit 65, and a sling rope movement limiting unit 67.

[0048] The moving part body 61 (e.g., a dolly) is the main body of the moving part 60. The moving part body 61 is the part that comes into contact with the suspended load upper surface 11a when the moving part 60 moves to remove the ball. The moving part body 61 may be, for example, a dolly that runs on the suspended load upper surface 11a, or may be something that slides (slides) on the suspended load upper surface 11a. The moving part body 61 includes a moving part body frame 61a, a moving member 61b, a connecting part attachment part 61c, and a moving part hanging part attachment part 61d.

[0049] The moving part main body frame 61a is a structure (frame) that constitutes most of the moving part main body 61. As shown in Fig. 3, the moving part main body frame 61a may include a rod-shaped member, may include a plate-shaped member, or may be a combination of a rod-shaped member and a plate-shaped member. The moving part main body frame 61a may have a frame-shaped portion that combines a plurality of rod-shaped members. The rod-shaped members that constitute the moving part main body frame 61a may include a square pillar-shaped member (e.g., flat steel, etc.) or a cylindrical member (e.g., steel bar, etc.).

[0050] The moving member 61b contacts the upper surface 11a of the suspended load as shown in FIG. 2. The moving member 61b is a part that allows the moving section 60 to move smoothly relative to the upper surface 11a of the suspended load. The moving member 61b is attached to the moving section main body frame 61a. As shown in FIG. 3, the moving member 61b may be disposed outside the outer end of the moving section main body frame 61a in the lateral direction Y, or may be disposed inside the outer end of the moving section main body frame 61a in the lateral direction Y. The moving member 61b may be disposed at the center of the moving section main body frame 61a in the lateral direction Y. As shown in FIG. 2, when the moving section main body 61 is a cart, the moving member 61b is a wheel that can rotate relative to the moving section main body frame 61a. A plurality of moving members 61b that are wheels may be provided. When the moving section main body 61 slides (slides) on the upper surface 11a of the suspended load, the moving member 61b is a member that slides relative to the upper surface 11a of the suspended load. In this case, the moving member 61b may be, for example, a sliding plate (sliding pad). The material of the moving member 61b is preferably a material that is unlikely to scratch the suspended load upper surface 11a. For example, the material of the moving member 61b may be resin or rubber, such as urethane rubber. Note that the moving member 61b does not need to be provided, and the surface of the lower side Z2 of the moving unit main body frame 61a may directly contact the suspended load upper surface 11a.

[0051] The connecting part attachment part 61c is a part attached to the connecting part 51. The connecting part attachment part 61c is attached to the connecting part 51 so that the connecting part 51 can rotate with respect to the moving part 60. The connecting part attachment part 61c is attached to the connecting part 51 so that the connecting part 51 can rotate with respect to the moving part 60 around a rotation axis extending in the horizontal direction Y. The moving part 60 does not have to be rotatable with respect to the connecting part 51. In detail, as long as the moving part 60 (more specifically, the sling rope pushing part 65a (see FIG. 3) described later) can push the sling rope 25 when the moving part 60 performs the sling removal movement, the connecting part 51 does not have to be rotatable with respect to the moving part 60. In the example shown in FIG. 2, the connecting part attachment part 61c is disposed in the rear X2 part of the moving part main body 61 (for example, near the rear X2 end). For example, the connecting part attachment part 61c protrudes from the moving part main body frame 61a to the upper side Z1. Specifically, the connecting portion attachment portion 61c has a pin hole for connecting to the connecting portion 51 with a pin, or the like.

[0052] The moving part hanging part mounting part 61d is a part to which the moving part hanging part 55 is attached. In the example shown in Fig. 2, the moving part hanging part mounting part 61d is disposed on the front side X1 of the connecting part mounting part 61c. For example, the moving part hanging part mounting part 61d protrudes from the moving part main body frame 61a to the upper side Z1. Specifically, the moving part hanging part mounting part 61d is a part (for example, a plate-shaped member) having a hole for connecting the moving part hanging part 55.

[0053] The moving-unit weight 63 is a weight (weight) for suppressing changes in the posture of the moving unit 60 (maintaining balance). As shown in FIG. 1, the moving-unit weight 63 suppresses changes in the posture of the moving unit 60 when the moving unit 60 is floating above the suspended load 11. As shown in FIG. 4, the moving-unit weight 63 suppresses changes in the posture of the moving unit 60 when the moving unit 60 moves to remove the load, making it easier for the moving unit 60 to come into contact with the upper surface 11a of the suspended load (details will be described later). The moving-unit weight 63 is attached to the moving-unit main body 61. For example, the moving-unit weight 63 is attached (mounted) to the upper surface Z1 of the moving-unit main body frame 61a.

[0054] In the example shown in FIG. 4, the moving section weight 63 is attached to the end of the moving section main body 61 on the rear side X2. In this example, the moving section weight 63 is disposed on the rear side X2 of the moving section hanging section attachment section 61d and on the rear side X2 of the connecting section attachment section 61c. The moving section weight 63 may be disposed on the front side X1 of the connecting section attachment section 61c, for example, between the connecting section attachment section 61c and the moving section hanging section attachment section 61d in the front-rear direction X. The moving section weight 63 may be disposed on the front side X1 of the connecting section attachment section 61c. The moving section weight 63 is, for example, a plate-like shape, and specifically, a rectangular parallelepiped plate-like shape. Only one moving section weight 63 may be provided, or multiple moving section weights 63 may be provided. A part or all of the moving section weight 63 may be detachable from the moving section main body 61. The moving section weight 63 may be detachable from the moving section main body 61, so that the mass of the moving section weight 63 can be adjusted.

[0055] The sling rope handling part 65 (for example, a sling) is a part that handles the sling rope 25, as shown in FIG. 3. The sling rope handling part 65 pushes the sling rope 25. The sling rope handling part 65 supports the sling rope 25. The sling rope handling part 65 is disposed at the end (tip) of the front side X1 of the moving part 60. The sling rope handling part 65 is attached and fixed to the end of the front side X1 of the moving part main body 61 (more specifically, the moving part main body frame 61a). The sling rope handling part 65 may include a rod-shaped member, may include a plate-shaped member, or may be a combination of a rod-shaped member and a plate-shaped member. The sling rope handling part 65 may be attached to the moving part main body frame 61a in an angle adjustable manner (for example, angle adjustable in the vertical direction Z). The sling rope handling part 65 may be fixed to the moving part main body frame 61a in a state in which the attachment angle of the sling rope handling part 65 relative to the moving part main body frame 61a is adjusted. For example, the sling rope handling portion 65 includes a sling rope pushing portion 65a and a sling rope supporting portion 65b.

[0056] The sling rope pushing part 65a is a part that pushes the sling rope 25 to the front side X1 when the moving part 60 performs a slinging movement. The sling rope pushing part 65a is arranged at a position corresponding to the sling rope 25 so that it can push the sling rope 25. Specifically, there are two sling rope middle upper parts 25f, one on each side (left and right) in the lateral direction Y. In this case, the sling rope pushing part 65a is arranged so that it can push the sling rope middle upper parts 25f on both sides in the lateral direction Y. Specifically, the sling rope pushing part 65a is provided on both sides (two places, left and right) in the lateral direction Y of the sling rope handling part 65. It is preferable that the sling rope pushing part 65a has a shape that limits the movement of the sling rope 25 in the lateral direction Y relative to the sling rope pushing part 65a. It is preferable that the sling rope pushing part 65a has a shape that allows the sling rope 25 to be hooked. Specifically, the sling rope pushing portion 65a preferably has a shape (concave, U-shaped) that is recessed toward the rear side X2. The sling rope pushing portion 65a is, for example, in a bifurcated shape.

[0057] The sling rope support part 65b supports the sling rope 25 from the lower side Z2 after the sling rope 25 has been released from the suspended load 11 (see Figs. 4 to 6) (the details of the support will be described later). The sling rope support part 65b is disposed at a position corresponding to the sling rope 25 so as to be able to support the released sling rope 25 from the lower side Z2. Specifically, the sling rope support part 65b is disposed so as to be able to support the upper middle parts 25f of the sling rope on both sides (the two left and right parts) in the lateral direction Y from the lower side Z2. Specifically, the sling rope support part 65b is provided on both sides (the left and right parts) of the sling rope handling part 65 in the lateral direction Y. It is preferable that the sling rope support part 65b has a shape that restricts the movement of the sling rope 25 in the lateral direction Y relative to the sling rope support part 65b, similar to the sling rope pushing part 65a. The sling rope support portion 65b may be used in combination with part or all of the sling rope pushing portion 65a, or may be provided separately (independently) from the sling rope pushing portion 65a.

[0058] The sling rope movement limiting section 67 (e.g., a ring) limits the position of the sling rope 25 relative to the sling rope handling section 65 within a predetermined range. The sling rope movement limiting section 67 limits the position of the sling rope 25 relative to the sling rope pushing section 65a within a predetermined range. Therefore, for example, even if the moving section 60 moves in the lateral direction Y relative to the hoist 23, when the moving section 60 moves to release the sling rope, the sling rope pushing section 65a can reliably push the sling rope 25 (does not let the sling rope 25 escape). In addition, after the sling rope 25 has been released from the suspended load 11 (see Figures 4 to 6), the sling rope supporting section 65b can reliably support the sling rope 25 from the lower side Z2.

[0059] Specifically, the sling rope movement limiting part 67 is configured to surround the periphery of the sling rope 25 with the sling rope handling part 65 and the sling rope movement limiting part 67. The sling rope movement limiting part 67 is configured so that the sling rope handling part 65 and the sling rope movement limiting part 67 form a ring shape. The sling rope movement limiting part 67 is substantially ring-shaped. The sling rope movement limiting part 67 is attached and fixed to the sling rope handling part 65. The sling rope movement limiting part 67 may be fixed to the sling rope handling part 65 by, for example, welding, or may be fixed by a fastening member (such as a bolt). Specifically, the sling rope movement limiting part 67 is a linear member (such as a wire) formed into a substantially ring shape.

[0060] The holding portion 71 (e.g., an air cylinder) holds the position of the moving portion 60 relative to the hoist 23, as shown in FIG. 6. The holding portion 71 holds the moving portion 60 at a position X1 forward of the position (60I) of the moving portion 60 when the sling rope 25 is in the load-hoisting state during "hoisting of the sling 20 after the sling is removed" described below (details will be described later). The holding portion 71 restricts the movement of the moving portion 60 to the rear side X2. The holding portion 71 does not have to restrict the movement of the moving portion 60 to the front side X1. For example, the holding portion 71 does not restrict, or restricts very little, the movement of the moving portion 60 to the front side X1.

[0061] Specifically, the holding portion 71 is a cylinder that can expand and contract (telescopic cylinder). For example, the holding portion 71 is a fluid pressure cylinder that limits the expansion and contraction of the holding portion 71 by fluid pressure. The fluid that limits the expansion and contraction of the holding portion 71 is, for example, a gas, such as air (the holding portion 71 is, for example, an air cylinder). If the fluid is a liquid, there is a risk of the liquid leaking from the holding portion 71, so the fluid is preferably a gas. The holding portion 71 may be an electric cylinder or the like, or it does not have to be a telescopic cylinder. For example, the holding portion 71 may be a device provided at the end (base end) of the connecting portion 51 on the side of the hanging balance 23, or may be a clutch, a brake, or the like. Below, a case where the holding portion 71 is a telescopic cylinder will be mainly described.

[0062] The holding section 71 is attached directly or indirectly to each of the hanging balance 23 and the moving section 60. In the example shown in FIG. 6, the holding section 71 is attached to the holding section bracket 43, and is attached to the hanging balance 23 via the holding section bracket 43. The holding section 71 is attached to the connecting section 51, and is attached to the moving section 60 via the connecting section 51. The attachment position of the holding section 71 to the connecting section 51 may be adjustable or may not be adjustable (the same applies to the attachment position to the holding section bracket 43). For example, the attachment position of the holding section 71 to the connecting section 51 in the longitudinal direction of the connecting section 51 may be adjustable. In the example shown in FIG. 6, the holding section 71 is disposed on the rear side X2 of the connecting section 51. In this example, the holding section 71 is attached to the rear side X2 portion of the connecting section 51. The holding section 71 is attached to the holding section bracket 43 disposed on the rear side X2 of the connecting section 51. The holding section 71 may be disposed on the front side X1 of the connecting section 51.

[0063] The holding part 71 is rotatably attached to the hanging balance 23. For example, the holding part 71 is rotatably attached to the vertical member bracket 43b of the holding part bracket 43. The holding part 71 is attached to the hanging balance 23 so as to be rotatable in the front-rear direction X and the up-down direction Z relative to the hanging balance 23 (rotatable about a rotation axis extending in the horizontal direction Y). The holding part 71 is rotatably attached to the connecting part 51. The holding part 71 is attached to the connecting part 51 so as to be rotatable in the front-rear direction X and the up-down direction Z relative to the connecting part 51 (rotatable about a rotation axis extending in the horizontal direction Y).

[0064] The holder 71 is preferably attached to one or both of the hanging balance 23 and the connecting part 51 so as to be rotatable (for example, rotatable within a predetermined range) about a rotation axis extending in a direction different from the lateral direction Y (described later). Specifically, for example, a large gap (play) may be provided between an axis (for example, a pin) for attaching the holder 71 to one or both of the hanging balance 23 and the connecting part 51 and a hole (for example, a pin hole) through which the axis passes.

[0065] As described above, the holding portion 71 is, for example, an extendable cylinder. For example, the holding portion 71 is configured to be able to (individually) adjust the force required to extend the holding portion 71 and the force required to contract the holding portion 71. Specifically, the holding portion 71 is configured to be able to adjust the amount of fluid (e.g., air) entering and leaving the cylinder tube. More specifically, the holding portion 71 is provided with an adjustment valve. The holding portion 71 is provided with an adjustment valve that adjusts the amount of fluid entering the cylinder tube, and an adjustment valve that adjusts the amount of fluid leaving the cylinder tube.

[0066] A specific example of the extension / contraction operation of the holding portion 71 in the case where the holding portion 71 is disposed on the rear side X2 of the connecting portion 51 is as follows. As described above, the holding portion 71 may restrict the movement of the moving portion 60 toward the rear side X2, but may not restrict the movement of the moving portion 60 toward the front side X1. When the moving portion 60 moves toward the front side X1, the holding portion 71 extends (see Figs. 2 and 4). The extension operation of the holding portion 71 is not restricted (or is substantially not restricted). Specifically, a valve that adjusts the flow of fluid into and out of the cylinder tube when the holding portion 71 extends (for example, a valve that adjusts the amount of fluid flowing out) is set to fully open (or substantially fully open). Also, when the moving portion 60 moves toward the rear side X2, the holding portion 71 contracts (see Figs. 4 to 6). The contraction operation of the holding portion 71 is limited. Specifically, a valve that adjusts the flow of fluid into and out of the cylinder tube when the holding portion 71 contracts (for example, a valve that adjusts the amount of fluid entering) is adjusted to a closed state rather than a fully open state. Note that when the holding portion 71 is disposed on the front side X1 of the connecting portion 51, the extension and contraction in the above description are reversed.

[0067] The holding portion 71 expands and contracts (is driven) in accordance with the rotation of the connecting portion rotation axis 51a of the connecting portion 51 relative to the hoisting balance 23. The holding portion 71 does not need to expand and contract using power. The holding portion 71 may hold the moving portion 60 at X1 forward of the position (60I) of the moving portion 60 in the load-hoisting state without using power (described later). Note that the holding portion 71 may use power to hold the moving portion 60 at X1 forward of the position (60I) of the moving portion 60 in the load-hoisting state. When the holding portion 71 is a fluid pressure cylinder, the above-mentioned "power" is, for example, a pressure source of fluid pressure. When the holding portion 71 is an air cylinder, the above-mentioned "power" is, for example, a compressor that pressurizes air.

[0068] The sling rope retraction section 73 (e.g., a spring) prevents the sling rope 25 from interfering with the load 11 when "hoisting the sling 20 after the sling is released" as described later. The sling rope retraction section 73 retracts the sling rope 25 to the rear side X2 (details will be described later). The sling rope retraction section 73 is connected to the sling rope 25. For example, two sling rope retraction sections 73 are provided and connected to the upper middle parts 25f of the sling rope on both sides (left and right) in the lateral direction Y. In the example shown in FIG. 6, the sling rope retraction section 73 is connected to the sling rope second part 25b (e.g., a hook, a ring, etc.). The sling rope retraction section 73 is connected to an object on the rear side X2 of the sling rope 25. For example, the sling rope retraction section 73 is connected to the lifting balance 23 at a position on the rear side X2 of the sling rope 25. The sling rope retraction part 73 may be directly connected to the hoist balance 23, or may be indirectly connected to the hoist balance 23 (for example, via the bracket 40, etc.). The sling rope retraction part 73 may be, for example, substantially string-shaped or rod-shaped.

[0069] The sling rope retraction section 73 may always retract the sling rope 25 to the rear side X2. For example, the sling rope retraction section 73 may have a retraction spring 73a. The sling rope retraction section 73 may retract the sling rope 25 to the rear side X2 only after the moving section 60 has released the sling rope 25. The sling rope retraction section 73 may use an actuator such as a motor, for example, and more specifically, may have a winch that winds up the retraction rope 73b. In the example shown in FIG. 6, the sling rope retraction section 73 includes a retraction spring 73a and a retraction rope 73b.

[0070] The retraction spring 73a is a spring for pulling the sling rope 25. The retraction spring 73a is, for example, a (long) coil spring in a generally string-like shape. In this case, the retraction spring 73a is set to a tension and length that can prevent the sling rope 25 from interfering with the load 11 when "winding up the sling 20 after the sling is removed" (the same applies to the length of the retraction rope 73b). The retraction spring 73a may be a spiral spring that winds up the retraction rope 73b, or may be another spring.

[0071] The retraction rope 73b is a string-like member. In the example shown in Fig. 6, two retraction ropes 73b are provided in one sling rope retraction section 73. The retraction ropes 73b are connected to both ends of the retraction spring 73a in the longitudinal direction. The retraction rope 73b is connected to the end of the front side X1 (sling rope 25 side) of the retraction spring 73a and the sling rope 25. The retraction rope 73b is connected to the end of the rear side X2 of the retraction spring 73a and the hoist 23.

[0072] (Activation) The suspension device 1 shown in FIG. 1 is configured to operate as follows.

[0073] (Lowering of suspended loads 11, etc.) The main rope 13 and main hook 15 suspend the hoisting tool 20 and the load 11. At this time, the load 11 has not yet landed (described below), and the sling rope 25 is slinging the load 11. In this state, the main rope 13 is let out from the winch of the crane. Then, the main hook 15, the hoisting tool 20, and the load 11 are wound down (moved to the lower side Z2).

[0074] (Landing of Suspended Load 11) When the load 11 is lowered, the load 11 lands. Then, the tension in the sling rope 25 due to the mass of the load 11 is released. The "landing" of the load 11 may mean that the load 11 is placed on the ground via bedding (e.g., wood) or the load 11 is placed on the floor, or the load 11 is placed on a load placed on the ground or a floor. Specifically, for example, the load 11, which is a billet, may land on the floor inside a hold via bedding, or it may land on a load placed inside the hold via bedding.

[0075] (Automatic ball removal) As the sling 20 is wound down, the sling rope 25 is automatically released from the load 11 (automatic sling release). Specifically, when the main hook 15 and the hoist 23 are further wound down with the load 11 on the ground, the moving section 60 performs a sling release movement, as shown in Figures 2 and 4, and pushes the sling rope 25 to the front side X1 to release it from the load 11. Details of automatic sling release will be described below.

[0076] (Ball removal movement of moving part 60) 1, the main hook 15 and the hoist 23 are further lowered. Then, as shown in FIG 2, the moving part 60 (more specifically, the moving member 61b) comes into contact with the upper surface 11a of the suspended load (referred to as "the moving part 60 lands on the suspended load 11").

[0077] With the moving member 61b in contact with the upper surface 11a of the suspended load, the main hook 15 and the hoist 23 shown in Fig. 1 are further wound down. At this time, with the moving part 60 in contact with the upper surface 11a of the suspended load, the connecting part 51 shown in Fig. 2 converts the movement (lowering) of the hoist 23 to the lower side Z2 into a movement of the moving part 60 to the front side X1. At this time, the connecting part 51 converts the force (gravity) due to the weight (mass) of the hoist 23 into a force pushing the moving part 60 to the front side X1 (further details of this force conversion will be described later).

[0078] The moving part 60 performs ball removal movement by being pushed by the connecting part 51. More specifically, the moving part 60 moves to the front side X1 while in contact with the suspended load upper surface 11a by being pushed by the connecting part 51. For example, when the moving part main body 61 is a dolly and the moving members 61b are wheels, the moving part main body 61 runs on the suspended load upper surface 11a, and the moving members 61b roll on the suspended load upper surface 11a.

[0079] The moving section 60 pushes the sling rope 25 to the front side X1 by performing the sling release movement. More specifically, the sling rope push section 65a (see FIG. 3) pushes the sling rope 25 (for example, the sling rope middle upper part 25f) to the front side X1. At this time, the connecting section 51 converts the force due to the weight of the hoist 23 into a force (sling release force) by which the moving section 60 pushes the sling rope 25 to the front side X1. At this time, the load 11 has landed and the tension of the sling rope 25 due to the mass of the load 11 is no longer present, so the sling rope push section 65a can move the sling rope 25 to the front side X1. When the sling rope 25 moves to the front side X1, the sling rope 25 is released from the load 11 as shown in FIG. 4. Specifically, the sling rope lower part 25e moves to the front side X1 with respect to the load 11 (is released from the load 11). The weight of the hoist balance 23 must be large enough to enable the moving part 60 to move the sling rope 25 to the front side X1.

[0080] As described above, the moving unit 60 utilizes the weight of the hoist 23 to release the sling rope 25. Therefore, a drive source for moving the moving unit 60 to the front side X1 is not required. Specifically, for example, the moving unit 60 does not need to be self-propelled by a motor or the like. In addition, the holding unit 71 does not need to be driven to expand and contract by power (for example, fluid pressure). Therefore, the configuration of the hoist 20 can be simplified compared to a case where a drive source for moving the moving unit 60 to the front side X1 is required. Note that the above "drive source" does not include power for lowering the hoist 23 (specifically, the weight of the hoist 23 and the power of a crane that winds down the hoist 23).

[0081] (Details of force conversion) As described above, the connecting part 51 converts the movement of the hanging balance 23 to the lower side Z2 into a movement of the moving part 60 to the front side X1 (performs force conversion). A specific example of the configuration of the connecting part 51 and the like for performing this force conversion will be described.

[0082] As shown in FIG. 2, the connecting part 51 connects the hoist 23 and the moving part 60 as described above. The connecting part 51 is arm-shaped. The connecting part 51 is not, for example, a bendable link, but is an arm-shaped rigid body. The connecting part 51 has a connecting part moving part attachment position 51c. The connecting part moving part attachment position 51c is a position where the connecting part 51 is attached to the moving part 60 (attaching position of the connecting part 51 to the moving part 60). The connecting part moving part attachment position 51c is a position (pushing position) where the connecting part 51 pushes the moving part 60 to the front side X1 when the hoist 23 moves to the lower side Z2 with the moving part 60 in contact with the upper surface 11a of the suspended load. This connecting part moving part attachment position 51c is disposed on the front side X1 of the connecting part rotation axis 51a. Specifically, just before the moving part 60 performs the ball-removing movement (when the moving part 60 lands on the suspended load 11), the connecting part moving part attachment position 51c is located on the front side X1 of the connecting part rotation axis 51a. Also, even while the moving part 60 is performing the ball-removing movement, the connecting part moving part attachment position 51c is located on the front side X1 of the connecting part rotation axis 51a (see FIG. 4).

[0083] Here, when viewed from the lateral direction Y, the line segment connecting the connecting part rotation axis 51a and the connecting part moving part mounting position 51c is defined as the connecting part line segment L. The connecting part line segment L extends in the direction of the force acting from the connecting part 51 to the moving part 60 when the moving part 60 moves to remove the ball. For example, the connecting part line segment L extends in the longitudinal direction or approximately the longitudinal direction of the connecting part 51. The angle of the connecting part line segment L with respect to the front-rear direction X is defined as the inclination angle θ. When the moving part 60 lands on the suspended load 11 and while the moving part 60 is moving to remove the ball, the connecting part line segment L is inclined with respect to the vertical direction Z so that it is positioned on the front side X1 as far as the lower side Z2. When the moving part 60 lands on the suspended load 11 and while the moving part 60 is moving to remove the ball, the inclination angle θ is less than 90°.

[0084] When the hoist 23 moves to the lower side Z2 with the moving part 60 in contact with the upper surface 11a of the suspended load, the connecting part rotation shaft 51a moves to the lower side Z2. Then, the connecting part 51 rotates to the front side X1 about the connecting part rotation shaft 51a, and the connecting part moving part mounting position 51c moves to the front side X1 about the connecting part rotation shaft 51a. Then, the moving part 60 moves to the front side X1. Note that, as the connecting part 51 rotates to the front side X1 about the connecting part rotation shaft 51a, the holding part 71 rotates relative to the hoist 23 (more specifically, relative to the holding part bracket 43). In the example shown in FIG. 2, as the connecting part 51 rotates to the front side X1, the holding part 71 rotates to the front side X1 relative to the hoist 23 while extending.

[0085] (Function of moving weight 63) The moving part weight 63 suppresses the change in the posture of the moving part 60 when the moving part 60 moves to remove the sling. More specifically, the moving part 60 receives a reaction force (reaction) from the sling rope 25 by pushing the sling rope 25 to the front side X1. At this time, if the moving part 60 is too light, the reaction force received from the sling rope 25 changes the posture of the moving part 60 (more specifically, the moving part main body 61 (e.g., a dolly)), and the moving part 60 becomes unstable. For example, the moving part 60 may float up from the upper surface 11a of the suspended load. If the moving part 60 becomes unstable, the moving part 60 may not be able to move the sling rope 25 to the front side X1 (remove the sling). Therefore, the moving part 60 is provided with the moving part weight 63. Therefore, the moving part weight 63 suppresses the change in posture of the moving part 60 when the moving part 60 moves to remove the sling. For example, the moving-part weight 63 makes it easier for the moving part 60 to come into contact with the upper surface 11a of the suspended load, and prevents the moving part 60 from floating up from the upper surface 11a of the suspended load. Since the change in the posture of the moving part 60 is prevented, the moving part 60 can move the sling rope 25 to the front side X1 in a stable posture. Note that, in cases where the mass of the moving part 60 is large enough that the change in the posture of the moving part 60 is not a problem, the moving part 60 does not need to be provided with the moving-part weight 63.

[0086] (Winding up sling 20 after removing the rope) As shown in FIG. 4, after the moving part 60 releases the sling rope 25 from the suspended load 11, the main rope 13 shown in FIG. 1 is wound up by the winch of the crane, and the main hook 15 and the hoisting device 20 are wound up (moved to the upper side Z1). Then, as shown in FIG. 5, the moving part 60 moves to the rear side X2 while in contact with the upper surface 11a of the suspended load. Specifically, when the hoisting balance 23 moves to the upper side Z1, the connecting part rotation shaft 51a moves to the upper side Z1. Then, the connecting part 51 rotates to the rear side X2 around the connecting part rotation shaft 51a, and the connecting part moving part mounting position 51c moves to the rear side X2 around the connecting part rotation shaft 51a. At this time, the holding part 71 rotates relative to the hoisting balance 23. In the example shown in FIG. 5, the holding part 71 rotates to the rear side X2 relative to the hoisting balance 23 (more specifically, relative to the holding part bracket 43) while contracting. At this time, the holding portion 71 restrains the movement of the moving portion 60 toward the rear side X2.

[0087] With the moving part 60 in contact with the upper surface 11a of the suspended load, the main hook 15 and the hoisting tool 20 shown in Fig. 1 are further hoisted up. Then, as shown in Fig. 6, the moving part 60 (more specifically, the moving part main body 61 (e.g., a dolly)) moves away from the upper surface 11a of the suspended load to the upper side Z1 (floats up). At this time, the moving part 60 is hoisted up by the hoist balance 23 via the connecting part 51 and the moving part hoisting part 55.

[0088] (Suppression of interference with sling rope 25) The sling 20 is configured to suppress interference of the sling rope 25 with the load 11 when the sling 20 is wound up after the sling is released. Details are as follows. For example, the sling rope 25 may interfere with the load 11 as follows. When the sling 20 is wound up after the sling is released, the moving part 60 moves to the rear side X2 and the sling rope handling part 65 moves to the rear side X2 compared to when the moving part 60 releases the sling rope 25 (see FIG. 4). Then, the sling rope 25 moves to the rear side X2 and may interfere with (be caught on, for example, sling) the load 11. Specifically, for example, as shown by the two-dot chain line in FIG. 6, the sling rope 25 is disposed at an angle with respect to the up-down direction Z so that it is disposed on the front side X1 as it approaches the lower side Z2 between the hoist 23 and the sling rope handling part 65. The sling rope 25 is then arranged (hangs down) so as to extend from the sling rope handling section 65 to the lower side Z2. This may cause the sling rope 25 (for example, the sling rope lower section 25e and its surrounding area) to interfere with the load 11. The arrangement of the sling rope 25 shown by the two-dot chain line in FIG. 6 is one example. Therefore, the sling gear 20 is configured to prevent the sling rope 25 from interfering with the load 11 when the sling gear 20 is wound up after being released. Specifically, one or more (preferably all) of the sling rope retraction section 73, the sling rope support section 65b, and the holding section 71 prevent the sling rope 25 from interfering with the load 11.

[0089] (Function of the sling rope retraction section 73) The sling rope retraction section 73 pulls the sling rope 25 toward the rear side X2, thereby preventing the sling rope 25 from interfering with the load 11. Specifically, the sling rope retraction section 73 pulls the connection between the sling rope retraction section 73 and the sling rope 25 (e.g., the second sling rope portion 25b) toward the rear side X2. This connection (e.g., the second sling rope portion 25b) is disposed closer to the rear side X2 than when the sling rope retraction section 73 does not pull the sling rope 25 toward the rear side X2 (see the sling rope 25 shown by the two-dot chain line). This prevents the sling rope 25 (e.g., the lower sling rope portion 25e and its surrounding portion) from sagging from the sling rope handling section 65. For example, the amount by which the sling rope 25 sags from the sling rope handling section 65 (the sagging amount of the sling rope 25) may be zero or approximately zero by the sling rope retraction section 73. In the example shown in FIG. 6, the lower sling rope portion 25e and its surrounding area are disposed in the vicinity of the sling rope handling portion 65, and the amount of sagging of the sling rope 25 is substantially zero.

[0090] (Function of the sling rope support part 65b) The sling rope support part 65b supports the sling rope 25 from the lower side Z2, thereby preventing the sling rope 25 from interfering with the load 11. In the example shown in Fig. 6, the sling rope lower part 25e and its surrounding part are supported by the sling rope support part 65b from the lower side Z2 (rest on the sling rope support part 65b) in a state where they are arranged in the vicinity of the sling rope handling part 65. Therefore, the sling rope lower part 25e and its surrounding part are prevented from sagging down from the sling rope handling part 65.

[0091] (Function of holding unit 71) The holding part 71 holds the moving part 60 at a position X1 forward of the position (60I) of the moving part 60 in the load-lifting state when the sling 20 is hoisted after the sling is removed, thereby preventing the sling rope 25 from interfering with the load 11. In FIG. 6, the position (60I) of the rear end X2 of the moving part 60 and the position of the connecting part 51 in the load-lifting state are respectively indicated by two-dot chain lines. The holding part 71 only needs to hold the moving part 60 at a position X1 forward of the position (60I) of the moving part 60 in the load-lifting state, and does not need to completely restrict the movement of the moving part 60 to the rear X2. The holding part 71 does not need to hold the moving part 60 at the same position as the moving part 60 when the moving part 60 has finished its sling-removal movement (when the moving part 60 is positioned at the frontmost X1) as shown in FIG. 4. The holding part 71 shown in Fig. 6 may hold the moving part 60 at a position X2 behind the position of the moving part 60 when the moving part 60 has finished its movement to remove the hoist (see Fig. 4) and at a position X1 ahead of the position (60I) of the moving part 60 in the load-hoisting state. For example, an example in which the holding part 71 is a telescopic cylinder and is disposed at a position X2 behind the connecting part 51 is as follows. In this case, as shown in Fig. 6, the length of the holding part 71 when the hoisting device 20 is hoisted after the hoisting is removed becomes longer (the holding part 71 becomes extended) than the length of the holding part 71 in the load-hoisting state (see Fig. 1).

[0092] As described above, the holding portion 71 holds the moving portion 60 at a position X1 further forward than the position (60I) of the moving portion 60 in the load-lifting state. Therefore, the sling rope handling portion 65 can handle the sling rope 25 at a position X1 further forward than the position of the sling rope handling portion 65 in the load-lifting state. Specifically, the sling rope support portion 65b may be able to support the sling rope 25 at a position X1 further forward than the position of the sling rope support portion 65b in the load-lifting state. Also, the sling rope push portion 65a (see FIG. 3) may be able to push the sling rope 25 at a position X1 further forward than the position of the sling rope push portion 65a in the load-lifting state.

[0093] The holding unit 71 may hold the moving unit 60 temporarily, or may not continue to hold the moving unit 60. The holding unit 71 holds the moving unit 60 at least when the hoisting device 20 is wound up after the sling is released. For example, when the sling rope 25 is slinged around a new load 11 different from the load 11 from which the sling rope 25 was released, and the new load 11 is hoisted, the moving unit 60 returns to the position (60I) for the load hoisting state. Specifically, the moving unit 60 returns to the rearmost position X2 (or approximately the rearmost position X2) of the moving range of the moving unit 60 in the front-rear direction X relative to the hoist balance 23.

[0094] (Horizontal movement of the hanging balance 23) The hoist 23 may move (rotate, move in parallel) in the horizontal direction relative to the suspended load 11. For example, the hoist 23 may rotate in the horizontal direction relative to the suspended load 11. For example, when the suspended load 11 and the hoist 23 are each a member having a longitudinal direction, the hoist 23 is not always parallel to the suspended load 11. When viewed from the upper side Z1, the longitudinal direction of the hoist 23 may be inclined (twisted, displaced) relative to the longitudinal direction of the suspended load 11. Also, for example, the hoist 23 may move in the front-rear direction X and in the lateral direction Y relative to the suspended load 11. For example, the horizontal movement of the hoist 23 relative to the suspended load 11 may occur when the hoist 23 is lowered after the suspended load 11 lands (see FIG. 2 and FIG. 4) (before and after the moving part 60 lands on the suspended load 11). Furthermore, horizontal movement of the hoist balance 23 relative to the suspended load 11 can occur when the hoisting tool 20 is hoisted after the hoist is removed (before and after the moving part 60 rises up from the suspended load 11).

[0095] It is preferable that the members connected to the hoist 23 are configured so that deformation (e.g., bending) and damage to the members connected to the hoist 23 can be suppressed when the hoist 23 moves horizontally relative to the suspended load 11. Specifically, it is preferable that the hoist 23 and the members connected to the hoist 23 are rotatable relative to each other in various directions. The above-mentioned "members connected to the hoist 23" are, for example, one or more of the connecting unit 51, the holding unit 71, and the moving unit 60.

[0096] For example, the connecting part 51 may be rotatable not only around a rotation axis (connecting part rotation axis 51a) extending in the horizontal direction Y with respect to the hanging balance 23, but also around a rotation axis extending in a direction different from the horizontal direction Y. Specifically, the connecting part 51 may be rotatable (swingable) around a rotation axis (connecting part swing axis 51b) extending in the front-rear direction X with respect to the hanging balance 23. Furthermore, the connecting part 51 may be rotatable around an axis other than the connecting part rotation axis 51a and the connecting part swing axis 51b with respect to the hanging balance 23. For example, the connecting part 51 may be rotatable (rotating so as to twist the connecting part 51) around the longitudinal direction of the connecting part 51 with respect to the hanging balance 23 as a rotation axis. In addition, just as the connecting part 51 may be rotatable in various directions with respect to the hanging balance 23, the holding part 71 may be rotatable in various directions with respect to the hanging balance 23. Furthermore, the moving part 60 may be rotatable in various directions with respect to the connecting part 51. Furthermore, the moving part 60 may be rotatable in various directions relative to the connecting part 51 .

[0097] (Repetitive work) The operation of moving the load 11 by the hoist 20 shown in FIG. 1 is performed repeatedly. In detail, a certain load 11 is lifted by the hoist 20 and landed at a predetermined position. Then, the moving unit 60 automatically releases the sling rope 25 (see FIG. 4), and then the hoist 20 after the release is wound up (see FIG. 6). Then, a new load 11 is lifted by the hoist 20 and landed at a predetermined position. In this manner, the operation of moving the load 11 is performed repeatedly. It is preferable that the loads 11 moved in each operation have similar (standard) shapes and dimensions. It is preferable that the environment (removal environment) around the sling rope 25 that is removed from the load 11 in each operation is approximately constant. In this case, once the settings of the hoist 20 are set, the operation can be performed repeatedly without changing (or almost without changing) the settings of the hoist 20. If the shape and dimensions of the load 11 (environment for removing the load) are changed, the settings of the hoisting tool 20 can be appropriately reconfigured.

[0098] (Example of setting hoist 20) For example, the hoisting device 20 is set so that the amount of sling rope 25 that can be pushed out by the moving part 60 (hereinafter referred to as the "rope push-out amount") when the moving part 60 performs a sling removal movement is an amount that allows the sling rope 25 to be removed from the load 11.

[0099] For example, the settings of the hoist 20 may be adjusted as follows. For example, the attachment position of the connecting part 51 to the hoist balance 23 (for example, the position of the connecting part bracket 41) may be adjusted. The attachment position of the holding part 71 to the hoist balance 23 (for example, the position of the holding part bracket 43) may be adjusted. The attachment position of the holding part 71 to the connecting part 51 may be adjusted. The length of the moving part 60 in the front-rear direction X may be adjusted. The length of the connecting part line segment L of the connecting part 51 shown in FIG. 2 may be adjusted, and the inclination angle θ when the moving part 60 lands on the suspended load 11 may be adjusted. Note that the longer the connecting part line segment L, the greater the amount of rope that can be pushed out. Also, even if the length of the connecting part line segment L is the same, the greater the inclination angle θ when the moving part 60 lands on the suspended load 11 (but less than 90°), the greater the amount of rope that can be pushed out, and the smaller the inclination angle θ when the moving part 60 lands on the suspended load 11, the smaller the amount of rope that can be pushed out.

[0100] (About automation) As shown in FIG. 4, in the hoisting tool 20, the sling rope 25 can be automatically removed from the load 11 by moving (winding down) the hoisting tool 20 to the lower side Z2. Therefore, in the hoisting tool 20, the worker does not need to perform the work of removing the sling rope 25 from the load 11 (removing the sling), and the removal work can be automated. Also, as shown in FIG. 6, in the hoisting tool 20, when the hoisting tool 20 is wound up after the sling is removed, the interference of the sling rope 25 with the load 11 is automatically suppressed. Therefore, in the hoisting tool 20, the worker does not need to perform the work of separating the sling rope 25 from the load 11 (rope holding work), and the rope holding work can be automated. Here, when a worker performs one or both of the work of removing the sling and the rope holding work, the worker may have to work at a high place. For example, when a worker stands on top of the stacked loads 11 to work, the work may be performed at a height of 2 m or more (e.g., 2.6 m). With the lifting device 20, the work of removing the rope and holding the rope can be automated, eliminating the need for workers to work at heights.

[0101] (Winding and lowering operations) With the hoisting device 20 shown in Fig. 1, the work of removing the rope and the work of holding the rope can be performed automatically by simply moving the hoisting device 20 in the same way (or approximately the same way) as the winding up and winding down of the existing hoisting device 20. Therefore, no special operation (operation different from the existing operation) is required to perform the work of removing the rope and the work of holding the rope.

[0102] (About the driving source) With the hoisting tool 20, it is possible to remove the sling rope 25 from the suspended load 11 simply by winding down the hoisting tool 20. With the hoisting tool 20, no power (drive source) is required other than the power to lower the hoist balance 23 to remove the sling rope 25 from the suspended load 11. Therefore, with the hoisting tool 20, no large-scale device is required to remove the sling rope 25 from the suspended load 11. Therefore, capital investment for a large-scale device is not required.

[0103] (Effects of the first invention) The effects of the hoisting device 20 shown in Fig. 1 are as follows. The hoisting device 20 includes a hoisting balance 23, a sling rope 25, a connecting portion 51, and a moving portion 60. The hoisting balance 23 is for stabilizing the posture of the suspended load 11. The sling rope 25 is suspended from the hoisting balance 23 and can be draped over the suspended load 11. The connecting portion 51 is attached to the hoisting balance 23. The moving portion 60 is disposed below the hoisting balance 23 on the side Z2 and is connected to the hoisting balance 23 by the connecting portion 51. As shown in Fig. 2, the direction that intersects with the up-down direction Z and in which the sling rope 25 is removed from the suspended load 11 is defined as the front side X1 (sling removal side).

[0104] [Configuration 1] The connecting part 51 is configured to convert the movement of the hoisting balance 23 to the lower side Z2 into the movement of the moving part 60 to the front side X1 when the moving part 60 is in contact with the suspended load upper surface 11a (upper surface of the suspended load 11). The moving part 60 is configured to push the sling rope 25 to the front side X1 when it moves to the front side X1 while in contact with the suspended load upper surface 11a (when a sling release movement is performed).

[0105] In the above [Configuration 1], by moving the hoist balance 23 to the lower side Z2, the moving part 60 pushes the sling rope 25 to the front side X1 (the sling removal side), and the sling rope 25 can be removed from the suspended load 11. Therefore, there is no need for an operator to perform the task of removing the sling rope 25 from the suspended load 11 (the sling removal task) (the sling removal task can be automated). Furthermore, in the above [Configuration 1], no power (drive source) is required for the sling removal task other than the power to lower the hoist balance 23. Therefore, the hoist 20 can be made to have a simple configuration. Therefore, with the hoist 20, the sling removal task can be automated with a simple configuration.

[0106] (Effects of the second invention) [Configuration 2] The connecting part 51 is arm-shaped. The connecting part 51 is rotatably attached to the hanging balance 23. The position where the connecting part 51 is attached to the moving part 60 (connecting part moving part attachment position 51c) is disposed on the front side X1 of the rotation axis (connecting part rotation axis 51a) of the connecting part 51 relative to the hanging balance 23.

[0107] In the above [Configuration 2], when the connection part rotation shaft 51a moves to the lower side Z2 by moving the hoist 23 to the lower side Z2, the connection part moving part attachment position 51c automatically moves to the front side X1. Therefore, when the moving part 60 is in contact with the suspended load upper surface 11a, the movement of the hoist 23 to the lower side Z2 is converted into the movement of the moving part 60 to the front side X1, and this force conversion can be reliably achieved with a simple configuration.

[0108] (Effects of the third invention) [Configuration 3] As shown in Fig. 6, the hoist 20 includes a holding portion 71. The holding portion 71 holds the position of the moving portion 60 relative to the hoist balance 23 so that the moving portion 60 is positioned on the front side X1, relative to the position (60I) of the moving portion 60 relative to the hoist balance 23 when the sling rope 25 is hoisting the load 11.

[0109] With the above [Configuration 3], when the sling device 20 is wound up after the sling is released, the moving part 60 is held in a position X1 further forward than the position (60I) of the moving part 60 when the sling rope 25 is in a state in which it is hoisting the load 11 (load hoisting state). Therefore, when the sling device 20 is wound up after the sling is released, the moving part 60 can handle (e.g., push, support) the sling rope 25 in a position X1 further forward than the position (60I) of the moving part 60 in the load hoisting state. Therefore, interference of the sling rope 25 with the load 11 can be suppressed when the sling device 20 is wound up after the sling is released.

[0110] (Effect of the fourth invention) [Configuration 4] The sling device 20 is equipped with a sling rope retraction section 73. The sling rope retraction section 73 pulls the sling rope 25 to the rear side X2 (the side opposite to the side where the sling is removed).

[0111] Due to the above [Configuration 4], the sling rope 25 is positioned further to the rear side X2 when the sling tool 20 is wound up after the sling is released. As a result, the moving unit 60 can handle (e.g., push or support) the sling rope 25 in a state where it is pulled to the rear side X2 by the sling rope retraction unit 73 when the sling tool 20 is wound up after the sling is released. This prevents the sling rope 25 from sagging to the lower side Z2 than the moving unit 60. This prevents the sling rope 25 from interfering with the load 11.

[0112] (Effect of the fifth aspect of the invention) [Configuration 5] As shown in Fig. 3, the moving section 60 includes a sling rope pushing section 65a and a sling rope movement limiting section 67. The sling rope pushing section 65a is a section that pushes the sling rope 25 to the front side X1. The sling rope movement limiting section 67 limits the position of the sling rope 25 relative to the sling rope pushing section 65a within a predetermined range.

[0113] The above [Configuration 5] prevents the sling rope 25 from coming off the sling rope pushing portion 65a. Therefore, the moving portion 60 can more reliably push the sling rope 25 to the front side X1 when performing the sling release movement (see the above [Configuration 1]).

[0114] (Modification) The above-described embodiment (including modified examples in the embodiment (hereinafter the same)) may be modified in various ways. For example, the number of components in the above-described embodiment may be changed, or some of the components may not be provided. For example, the arrangement of the components may be changed. For example, the components may be fixed or connected directly or indirectly to each other. For example, the inclusion relationship of the components may be modified in various ways. For example, a component described as a lower component included in a higher-level component may not be included in this higher-level component, but may be included in another component. For example, a component described as a plurality of different elements may be treated as a single element. For example, a component described as a single element may be provided separately as a plurality of different elements. For example, each component may have only a part of each feature (function, arrangement, shape, operation, etc.). For example, the operation of the above-described embodiment may be treated as a "step" of a method of using the hoisting device 1 (for example, a method of using the hoisting tool 20). Specifically, the operation of hoisting the load 11 may be treated as a "hoisting step", etc. [Explanation of symbols]

[0115] 11 Hanging load 20 Hanging equipment 23 Hanging balance 25 Sling Rope 51 Connecting part 60 Mobile Part 61 Moving unit main body 63 Moving weight 65a Sling rope pusher 67 Sling rope movement limiting section 71 Holding part 73 Sling rope retraction section X1 Front side (ball removal side) X2 Rear side (opposite side from ball removal side) Z vertical direction

Claims

1. A lifting scale to stabilize the load position, A sling rope that is suspended from the sling and can be hung on the load; A connection part attached to the hanging balance; a moving part that is disposed below the hanging balance and is connected to the hanging balance by the connecting part; Equipped with When the direction intersecting the vertical direction and in which the sling rope is removed from the load is defined as the sling removal side, The connecting portion is configured to convert the downward movement of the lifting balance into the movement of the moving portion toward the lifting side when the moving portion is in contact with the upper surface of the load, The moving unit is configured to push the sling rope toward the lifting side when the moving unit moves to the lifting side while in contact with the upper surface of the load. Hanging equipment.

2. 2. The sling according to claim 1, The connecting portion is arm-shaped and rotatably attached to the hanging balance, The position where the connecting part is attached to the moving part is disposed on the ball removal side of the rotation axis of the connecting part relative to the hanging balance. Hanging equipment.

3. 2. The sling according to claim 1, and a holding section that holds the position of the moving section relative to the hoisting scale so that the moving section is positioned on the hoisting scale release side relative to the position of the moving section relative to the hoisting scale when the sling rope is in a state in which the load is lifted by the slinging rope. Hanging equipment.

4. 2. The sling according to claim 1, A sling rope retraction section that pulls the sling rope on the side opposite to the sling removal side is provided. Hanging equipment.

5. 2. The sling according to claim 1, The moving unit is A sling rope pushing portion which pushes the sling rope to the sling removal side; A sling rope movement limiting unit that limits the position of the sling rope relative to the sling rope pushing unit within a predetermined range; Equipped with Hanging equipment.

Images