Hoisting tool for crane

Abstract

To provide a hoisting tool for a crane capable of being hooked onto a shackle of a container only by remote control.SOLUTION: A hoisting device 100 for a crane has an arm 101 and an engagement part 150 that is swingably attached to the lower end of the arm 101 and has a hook 156 provided in front of the lower end. A cam hole 154a is formed in the upper part of the engagement part 150, and a shaft 157 attached to the lower end of the arm 101 is inserted into the cam hole 154a, so that the engagement part 150 is swingably attached to the lower end of the arm 101. The cam hole 154a is composed of a first cam hole 154a1 and a second cam hole 154a2. The first cam hole 154a1 has an elongated hole shape, and the longitudinal direction coincides with the vertical line direction, and the second cam hole 154a2 has an elongated hole shape that is longer than the first cam hole 154a1, and is formed downward and forward from the connection part with the first cam hole 154a1.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a crane hoisting device. [Background technology]

[0002] As shown in Fig. 5 of Patent Document 1, there has been a conventional ladle that is a refractory container with an open top that receives molten metal from a blast furnace. Such a ladle is transported to a mold by being suspended by a transport crane at a pair of trunnion shafts formed on its outer periphery. A hook-shaped hoist is hooked onto a shackle provided at the bottom of the outer periphery of the ladle, and the hoist is lifted up by an auxiliary crane, so that the ladle is tilted around the trunnion shaft as a rotation center, and the molten metal contained in the ladle is poured into the mold. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jpn. Jpn. Published No. 63-25253 Summary of the Invention [Problem to be solved by the invention]

[0004] Such ladles may have a shape in which the width increases as it moves upward. For ladles of this shape, it was difficult to hook the hoisting gear to the shackle by remote control of the auxiliary crane alone, so a person had to intervene using a wire rope and a hook or the like to hook the hoisting gear to the shackle. However, it was dangerous for a person to work near the ladle. For this reason, there was a demand for a crane hoisting gear that could be hooked to the shackle of a container such as a ladle by remote control alone.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a crane hoisting device that can be hooked onto a shackle of a container by remote control only. [Means for solving the problem]

[0006] The crane hoisting device according to the invention described in claim 1, which has been made to achieve the above object, comprises: An arm (101); and an engagement portion (150) that is swingably attached to the lower end of the arm and has a hook (156) provided in front of the lower end.

[0007] According to this, the lower end of the engaging part is brought into contact with the ground beside the shackle of the container, and the arm is further moved downward to rotate the engaging part, thereby rotating the engaging part to a rotation position where the hook can be hooked onto the shackle. Therefore, the hook can be hooked onto the shackle only by remote control. This eliminates the need for a person to be present near the container to hook the crane hoisting gear onto the shackle, ensuring the safety of the operation of hooking the hook onto the shackle. In addition, it is possible to reduce lost time and labor in the above operation.

[0008] The invention described in claim 2 is the invention described in claim 1, A cam hole (154a) is formed in the upper part of the engagement portion. The shaft (157) attached to the lower end of the arm is inserted into the cam hole, and the engagement portion is attached to the lower end of the arm so as to be able to swing.

[0009] According to this, when the arm is moved downward after the engaging portion is brought into contact with the ground, the engaging portion can be appropriately rotated by the cam hole to a rotation position where the hook can be hooked onto the shackle, thereby ensuring that the hook can be hooked onto the shackle.

[0010] The invention described in claim 3 is the invention described in claim 2, The cam hole is composed of a first cam hole (154a1) and a second cam hole (154a2), The first cam hole is an elongated hole, and its longitudinal direction coincides with the vertical line. The second cam hole is an elongated hole, with an upper rear end connected to a lower end of the first cam hole and extending downward and forward from the connection portion with the first cam hole.

[0011] According to this, when the shaft enters the second cam hole from the first cam hole, the upper part of the engagement part rotates in a direction away from the container, which makes it possible to more reliably rotate the engagement part to a rotation position where the hook can be hooked onto the shackle.

[0012] The invention described in claim 4 is the invention described in claim 3, A slope (154a3) that slopes downward and toward the front is formed on the inner surface on the rear side of the connection between the first cam hole and the second cam hole.

[0013] According to this, when the shaft reaches the inclined surface from the first cam hole, the upper part of the engagement part rotates in a direction away from the container. This makes it possible to more reliably rotate the engagement part to a rotation position where the hook can be hooked onto the shackle. Also, the engagement part can be rotated smoothly.

[0014] The invention described in claim 5 is the invention described in claim 4, The cross-sectional shape of the inclined surface is an arc shape.

[0015] This allows the engaging portion to rotate more smoothly.

[0016] The invention described in claim 6 is the invention described in claim 2, A cylindrical bush (166) is mounted on the shaft so as to be rotatable relative to the shaft. The bush is characterized in that it abuts against an inner peripheral surface of the cam hole.

[0017] This reduces wear on the shaft compared to a structure in which the shaft directly contacts the cam hole, and because the bushing that contacts the cam hole is rotatable relative to the shaft, wear on the bushing that contacts the cam hole can also be reduced.

[0018] The invention as set forth in claim 8 is characterized in that in the invention as set forth in claim 1, an upper weight (155) is provided on the upper rear part of the engagement part.

[0019] According to this, when the engaging portion starts to rotate after abutting against the ground, the upper weight applies a force to the engaging portion in a direction in which the upper portion of the engaging portion moves away from the container. This makes it possible to rotate the engaging portion more reliably. Furthermore, when the arm is moved upward after the engaging portion rotates, the action of the upper weight maintains the rotated state of the engaging portion. This makes it possible to reliably hook the hook formed on the engaging portion onto the shackle.

[0020] The invention described in claim 8 is the invention described in claim 1, The engaging portion is characterized in that a tilting notch (151b, 158a) is formed at the lower rear end thereof.

[0021] This allows the engaging portion to rotate more reliably after the engaging portion comes into contact with the ground.

[0022] The invention described in claim 9 is the invention described in claim 1, A lower weight (158) is provided at the lower end of the engaging portion.

[0023] This allows the center of gravity of the engagement part to be lowered further, so that the engagement part can be more reliably grounded on the ground when rotated, and the engagement part can be rotated more stably.

[0024] The reference symbols in parentheses for each means described in this section and in the claims are examples showing the correspondence with the specific means described in the embodiments described later. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a front view of the crane hoisting tool and container according to one embodiment of the present invention. [Diagram 2] FIG. 4 is a front view of the engagement portion of the crane hoisting tool. [Diagram 3] 3 is a view taken along an arrow A in FIG. 2 and is a side view of an engagement portion of the crane hoisting tool. [Figure 4] FIG. [Diagram 5] 4 is an explanatory diagram showing the operation of the crane hoisting device of the present embodiment. FIG. [Figure 6] 4 is an explanatory diagram showing the operation of the crane hoisting device of the present embodiment. FIG. [Figure 7] 4 is an explanatory diagram showing the operation of the crane hoisting device of the present embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] (Container description) First, a container 500 tilted by a crane hoisting device 100 according to an embodiment of the present invention will be described with reference to FIG. 1. In this embodiment, the container 500 is a ladle for accommodating molten metal. The container 500 has a cylindrical container body 501 with a bottom. The container body 501 is composed of an outer skin made of a metal such as iron, and a refractory part made of a refractory material such as firebricks that is lined on the outer skin. The outer and inner diameters of the container 500 increase with increasing position on the upper side of the container 500. In other words, the outer peripheral surface of the container 500 is tilted from a vertical line so as to move away from the center of the container 500 (to move outward) with increasing position on the upper side.

[0027] A pair of trunnion shafts 502 are formed on both side surfaces of container body 501, protruding from the outer surface of container body 501. A shackle mounting portion 503 is formed in a portion above the lower end of the outer circumferential surface of container body 501. A U-shaped shackle 504 made of metal such as steel is attached to shackle mounting portion 503 in a swingable manner.

[0028] A trunnion ring 601 is rotatably attached to each of the pair of trunnion shafts 502. The trunnion ring 601 is connected to a wire 602 of a transfer crane (not shown). The container 500 can be moved in the horizontal and vertical directions by the transfer crane.

[0029] (Explanation of crane hoisting equipment) Next, a crane hoisting gear 100 according to one embodiment of the present invention will be described with reference to Fig. 1. In Fig. 1, the right side of the paper surface corresponds to the front side of the crane hoisting gear 100, the left side of the paper surface corresponds to the rear side of the crane hoisting gear 100, the upper side of the paper surface corresponds to the upper side of the crane hoisting gear 100, and the lower side of the paper surface corresponds to the lower side of the crane hoisting gear 100.

[0030] As shown in FIG. 1, a crane hoisting device 100 has an arm 101, an arm weight 102, a pair of hook guides 103, an arm shaft 104, and an engagement portion 150, all of which are made of metal such as steel.

[0031] The arm 101 is composed of a vertical portion 101a and a connecting portion 101b. The vertical portion 101a is formed into a vertically long box shape by welding metal plates such as steel plates. More specifically, the vertical portion 101a extends from the vertical center to the upper end along a vertical line, and the vertical portion 101a is formed so as to be inclined from the vertical line to be positioned forward as it moves downward from the vertical center to the lower end. The lower end of the vertical portion 101a is formed by a pair of plate-shaped members facing each other. An engagement portion 150 is attached to the lower end of the vertical portion 101a so as to be swingable.

[0032] The connecting part 101b is a part to which an auxiliary crane hook 701 attached to the end of a wire of an auxiliary crane (not shown) is hooked and connected. The rear end of the connecting part 101b is connected to the upper end of the vertical part 101a, and extends forward from the connection part with the upper end of the vertical part 101a. The connecting part 101b is a pair of metal plates arranged opposite each other with a gap in the depth direction, and is connected to the upper end of the vertical part 101a.

[0033] An arm shaft 104 that connects a pair of metal plates that make up connecting part 101b is attached to the center of connecting part 101b in the front-to-rear direction. An auxiliary crane hook 701 enters between the pair of metal plates that make up connecting part 101b from above and hooks onto the arm shaft 104. With this configuration, the arm 101 is connected to the auxiliary crane hook 701 of the auxiliary crane.

[0034] A pair of plate-shaped hook guides 103 are attached to the upper outer edges of the pair of metal plates that make up connecting part 101b. The distance between the pair of hook guides 103 increases with increasing distance from connecting part 101b. When connecting the auxiliary crane hook 701 to the arm shaft 104, the auxiliary crane hook 701 is guided by the hook guides 103 and led between the pair of metal plates that make up connecting part 101b.

[0035] A block-shaped arm weight 102 made of metal such as iron is attached to the front end of the connecting part 101b. In this embodiment, the arm weight 102 is attached to the connecting part 101b in a state where it is inserted between a pair of metal plates that make up the connecting part 101b. This arm weight 102 is intended to balance the crane hoisting equipment 100 so that the vertical part 101a stands upright when the crane hoisting equipment 100 is suspended by the auxiliary crane hook 701.

[0036] (Explanation of engagement part) Next, the engaging portion 150 of the crane hoisting device 100 will be described with reference to Figures 2 and 3. In Figure 2, the right side of the page is the front side of the engaging portion 150, the left side is the rear side of the engaging portion 150, the upper side is the upper side of the engaging portion 150, and the lower side is the lower side of the engaging portion 150. In Figure 2, vertical portion 101a of arm 101 is represented by a dashed line to make it easier to see cam hole 154a, which will be described later.

[0037] The engagement portion 150 has a pair of main body members 151, a first determination block 152, a second determination block 153, four guide plates 154, an upper weight 155, a hook 156, a shaft 157, a pair of lower weights 158, and a hook mounting shaft 159.

[0038] The pair of main body members 151 are substantially rectangular plate-shaped with the long sides extending in the vertical direction. The pair of main body members 151 are disposed facing each other with a space therebetween in the depth direction. A first determination block 152 that is elongated in the vertical direction is disposed between the rear ends of the pair of main body members 151. The front side main body member 151 and the rear side main body member 151 are connected to the first determination block 152 by a plurality of bolts 161. A plurality of (two in this embodiment) cylindrical determination pins 172 (shown in FIG. 3) are disposed between the front ends of the pair of main body members 151. The front side main body member 151 and the rear side main body member 151 are connected to the determination pins 172 by bolts 173.

[0039] Two guide plates 154 are attached to both sides of the upper part of the pair of main body members 151 by overlapping these faces with a plurality of bolts 165 and a plurality of nuts 177 fastened to the bolts 165. In other words, four guide plates 154 are attached to the pair of main body members 151. Interference prevention holes 151d are formed in communication with the pair of main body members 151. Cam holes 154a are formed in communication with each of the four guide plates 154 at positions inside the interference prevention holes 151d when viewed from the front.

[0040] The cam hole 154a is composed of a first cam hole 154a1 and a second cam hole 154a2. The first cam hole 154a1 is an elongated hole whose longitudinal direction coincides with the vertical line. The second cam hole 154a2 is an elongated hole whose length is longer than the first cam hole 154a1. The second cam hole 154a2 has an upper rear end connected to the lower end of the first cam hole 154a1, and is formed downward and forward from the connection part with the first cam hole 154a1. An inclined surface 154a3 is formed on the inner surface on the rear side of the connection part between the first cam hole 154a1 and the second cam hole 154a2, which is located toward the front as it is located downward. In this embodiment, the cross-sectional shape of the inclined surface 154a3 is an arc shape.

[0041] Positioning holes 154b, 151e are formed in communication with each other at the same position when the engaging portion 150 is viewed from the front in the pair of main body members 151 and the four guide plates 154. Both ends of a positioning pin 171 are inserted into these positioning holes 154b, 151e. This structure prevents the cam holes 154a formed in each of the four guide plates 154 attached to the main body member 151 from being misaligned.

[0042] The upper ends of the pair of integrated main body members 151 and four guide plates 154 are inserted between the lower end of the vertical part 101a of the arm 101, which is composed of a pair of plate-like members. A first shaft hole 101c is formed in communication with the lower end of the vertical part 101a of the arm 101, which is composed of a pair of plate-like members. A shaft 157 is inserted into the first shaft hole 101c and the cam hole 154a. A cylindrical bush 166 is rotatably attached to the shaft 157. The outer circumferential surface of the bush 166 contacts the inner circumferential surface of the cam hole 154a. The width dimension of the cam hole 154a is slightly larger than the diameter of the bush 166. With this configuration, the engagement part 150 is attached to the lower end of the arm 101 so as to be able to swing. In addition, the shaft 157 and the bush 166 slide along the cam hole 154a.

[0043] As shown in FIG. 3, a first oil groove 157b is formed on the outer circumferential surface of the shaft 157 from the center in the depth direction to just before both ends. A first recessed portion 157c that is recessed into a cylindrical shape is formed in the axial center of one end of the shaft 157. A first oil feed nipple 169 is attached to the bottom of the first recessed portion 157c of the shaft 157. Since the first oil feed nipple 169 is attached to the bottom of the first recessed portion 157c in this manner, the first oil feed nipple 169 does not protrude significantly from the one end of the shaft 157. A first oil passage 157d that connects the first oil feed nipple 169 and the first oil groove 157b is formed in the shaft 157. When lubricating oil such as grease is injected through the first oil nipple 169, the lubricating oil is supplied to the first oil groove 157b and is sealed between the shaft 157 and the bush 166 and between the shaft 157 and the first shaft hole 101c. This suppresses wear of the shaft 157, the bush 166, and the first shaft hole 101c.

[0044] 4, first key grooves 157a are formed on the outer circumferential surfaces of both ends of shaft 157. A rectangular first key plate 167 is attached to a lateral vertical portion 101a of shaft 157 by a plurality of bolts 168. First key plate 167 fits into first key groove 157a of shaft 157 to prevent shaft 157 from falling off from body member 151.

[0045] As shown in FIG. 2, the upper front end of the four guide plates 154 and the pair of main body members 151 is cut out in the shape of a right triangle. The cross-sectional shape of the corner 150a at the front upper end of the four guide plates 154 and the pair of main body members 151 is an arc shape. At this corner 150a, a reinforcing member 175 is sandwiched between the opposing guide plates 154. As shown in FIG. 3, the reinforcing member 175 is composed of a cylindrical abutment portion 175a and a cylindrical protrusion portion 175b protruding from the axis of both ends of the abutment portion 175a and having an outer diameter smaller than that of the abutment portion 175a. At the inner position of the corner 150a, a fitting hole 154c is formed in each of the pair of opposing guide plates 154. The protrusions 175b formed at both ends of the reinforcing member 175 are inserted and fitted into these fitting holes 154c. The main body member 151, a pair of guide plates 154 arranged on both sides thereof, and the reinforcing member 175 are connected by bolts 176. The radius of curvature of the corner 150a of the main body member 151 and the radius of curvature of the abutting portion 175a of the reinforcing member 175 are the same. The outer edge surface of the corner 150a of the main body member 151 and the outer circumferential surface of the abutting portion 175a are adjacent to each other and form a continuous surface.

[0046] A hook portion notch 151a is formed in the front of the lower end of the pair of main body members 151. A reinforcing plate 151f is attached by welding above the hook portion notch 151a of the pair of main body members 151. A second shaft hole 151c that communicates between the reinforcing plate 151f and the main body members 151 is formed in the center of the reinforcing plate 151f.

[0047] The hook 156 is sandwiched between a pair of main body members 151 and attached to the front side of the lower part of the pair of main body members 151 (one end side facing the shackle 504 at the lower part of the container 500). The hook 156 is composed of a mounting part 156a, a shank part 156b, a vent part 156c, and a tip part 156d. The mounting part 156a is annular, and a mounting hole 156a1 is formed in the center. The shank part 156b is rod-shaped, and its upper end is connected to the lower end of the mounting part 156a and extends rearward and downward from the lower end of the mounting part 156a. The vent part 156c is arc-shaped with an arc angle of about 180°, and its upper end is connected to the lower end of the shank part 156b. The vent part 156c opens to the front side. The tip portion 156d is rod-shaped, with its rear end connected to the front end of the bent portion 156c and extending upward and forward from the front end of the bent portion 156c. The cross-sectional area of ​​the tip portion 156d becomes smaller as it moves closer to the tip side (upper front side).

[0048] The hook portion cutout 151 a has a shape corresponding to the bent portion 156 c of the hook 156 , and is cut out so that at least the front side and tip portion 156 d of the bent portion 156 c are exposed from the main body member 151 .

[0049] A hook mounting shaft 159 is inserted into the second shaft hole 151c and the mounting portion 156a of the hook 156. Both ends of the hook mounting shaft 159 protrude slightly from the surface of the reinforcing plate 151f. A second key groove 159a is formed on the outer circumferential surface of both ends of the hook mounting shaft 159.

[0050] A rectangular second key plate 160 is attached to the reinforcing plate 151f by a plurality of bolts 162. The second key plate 160 enters a second key groove 159a of the hook mounting shaft 159, preventing the hook mounting shaft 159 from falling off from the main body member 151. The hook 156 wears with use, but when the hook 156 wears out, it can be easily replaced by attaching and detaching the bolts 162, the second key plate 160, and the hook mounting shaft 159.

[0051] As shown in FIG. 3, a second oil groove 159b is formed on the outer peripheral surface of the hook mounting shaft 159 from the center in the depth direction to just before both ends. A second recessed portion 159c that is recessed into a cylindrical shape is formed in the axis of one end of the hook mounting shaft 159. A second oil feed nipple 170 is attached to the bottom of the second recessed portion 159c of the hook mounting shaft 159. Since the second oil feed nipple 170 is attached to the bottom of the second recessed portion 159c in this way, the second oil feed nipple 170 does not protrude significantly from one end of the hook mounting shaft 159. A second oil passage 159d that connects the second oil feed nipple 170 and the second oil groove 159b is formed in the hook mounting shaft 159. When lubricating oil such as grease is injected through the second oil feed nipple 170, the lubricating oil is supplied to the second oil groove 159b and is sealed between the hook mounting shaft 159 and the mounting hole 156a1 and between the hook mounting shaft 159 and the mounting hole 156a1 and the second shaft hole 151c. This reduces wear on the hook mounting shaft 159, the mounting hole 156a1, and the second shaft hole 151c.

[0052] 2, the corners of the lower rear ends of the pair of main body members 151 are cut out in a right-angled triangular shape to form first tilting notches 151b. The hypotenuse of the first tilting notch 151b cut out in a right-angled triangular shape forms a first surface 151g.

[0053] The pair of lower weights 158 are plate-shaped and are attached by overlapping each other on the lower rear ends of the pair of main body members 151. A second determination block 153 is disposed between the lower rear ends of the pair of main body members 151. The front lower weight 158, the front main body member 151, and the second determination block 153 are connected by a plurality of bolts 162. The rear lower weight 158, the rear main body member 151, and the second determination block 153 are also connected by a plurality of bolts 162.

[0054] The lower rear end of the lower weight 158 ​​is cut in a right-angled triangle shape to form a second tilting notch 158a. The second tilting notch 158a is cut in the same shape as the first tilting notch 151b. The hypotenuse of the second tilting notch 158a cut in a right-angled triangle shape is the second surface 158b. The first surface 151g and the second surface 158b are adjacent to each other to form a continuous plane. The angle α between the ground G and the first surface 151g or the second surface 158b is 45° or more, preferably 50° to 75°, and is 60° in this embodiment. By setting the angle α at such an angle, the engagement portion 150 can be rotated more preferably, as described later.

[0055] An upper weight 155 is attached to the upper rear end of the pair of main body members 151 by a plurality of bolts 164. The upper weight 155 balances the engagement part 150 so that it stands upright when the shaft 157 is located at the upper end of the first cam hole 154a1. When the shaft 157 is located at the front end of the second cam hole 154a2, the upper weight 155 balances the engagement part 150 in a state in which the upper part of the engagement part 150 is tilted in a direction away from the container 500 as shown in FIG. 5(D) and maintains this state. In this embodiment, the upper weight 155 is formed by overlapping a plurality of metal plates, but may be in the form of a block. The upper end of the upper weight 155 is located above the upper ends of the main body member 151 and the guide plate 154. The lower end of the upper weight 155 is located below the lower end of the cam hole 154a.

[0056] (Operation of crane hoisting equipment) 5 to 7, the operation of the crane hoisting gear 100 will be described, in which the hook 156 of the crane hoisting gear 100 is hooked onto the shackle 504 of the container 500, the container body 501 is rotated to discharge the contents contained in the container body 501, and the container body 501 is returned to its original upright state. The auxiliary crane that moves the crane hoisting gear 100 is remotely operated.

[0057] As shown in Fig. 5(A), the engaging part 150 of the crane hoisting device 100 is moved to the side of the container 500 near the shackle 504, and the lower end of the engaging part 150 is grounded on the ground G. Until the engaging part 150 is grounded on the ground G, the shaft 157 is located at the upper end of the first cam hole 154a1 (see Fig. 2), and the engaging part 150 is upright.

[0058] When the arm 101 is moved downward from the state shown in Fig. 5A, the shaft 157 moves downward in the first cam hole 154a1. Then, when the shaft 157 reaches the inclined surface 154a3 (shown in Fig. 2) and slides on the inclined surface 154a3, the engaging part 150 starts to rotate in a direction in which the upper part of the engaging part 150 moves away from the container body 501, with the corner part C at the lower end of the engaging part 150 as a fulcrum (state shown in Fig. 5B). The corner part C at the lower end of the engaging part 150 is the point where the first surface 151g and the second surface 158b (shown in Fig. 2) come into contact with the ground G.

[0059] When the arm 101 is further moved downward from the state of FIG. 5B, the shaft 157 enters the second cam hole 154a2 and slides toward the front end of the second cam hole 154a2, and the engagement part 150 further rotates. When the upper part of the engagement part 150 tilts from the upright state so as to move away from the container body 501, the balance is lost from the state in which the engagement part 150 is balanced in the upright state, and the upper weight 155 applies a force to the engagement part 150 to rotate the upper part of the engagement part 150 in the direction away from the container body 501. Then, when the shaft 157 reaches the front end of the second cam hole 154a2, the downward movement of the arm 101 is stopped (state of FIG. 5C). In this state, the hook 156 opens upward, and the opening of the hook 156 faces the lower end side of the shackle 504. The arm 101 may be moved horizontally so that the opening of the hook 156 is located directly below the shackle 504 .

[0060] Next, the arm 101 is moved upward to hook the hook 156 onto the shackle 504 (the state shown in FIG. 5(D)). When the shaft 157 is positioned at the front end of the second cam hole 154a2, the upper weight 155 acts to maintain the engaging portion 150 in an inclined state.

[0061] Furthermore, when the arm 101 is moved upward (FIG. 6(E)→(F)), the abutment portion 175a (shown in FIG. 3) of the reinforcing member 175 of the engagement portion 150 abuts against the outer peripheral surface of the container body 501. In this manner, the cylindrical abutment portion 175a and the outer peripheral surface of the container body 501 come into surface contact with each other, thereby suppressing damage to the engagement portion 150 and the container body 501. When the arm 101 is moved upward, the container body 501 rotates about the trunnion shaft 502 (FIG. 6(G)→(H)), and the contents contained in the container body 501 are discharged.

[0062] Next, when the arm 101 is moved downward, the container body 501 rotates to an upright position (the state shown in FIG. 7(I)), and the hook 156 is disengaged from the shackle 504 (the state shown in FIG. 7(J)).

[0063] (Effects of the crane hoisting device of this embodiment) The effects of the crane hoisting device 100 will be described below. As shown in FIG. 1, a crane hoisting device 100 of this embodiment has an arm 101, and an engagement part 150 that is swingably attached to the lower end of the arm 101 and has a hook 156 provided in front of the lower end.

[0064] According to this, by bringing the lower end of the engaging part 150 into contact with the ground G on the side of the shackle 504 of the container 500 and further moving the arm 101 downward to rotate the engaging part 150, the engaging part 150 can be rotated to a rotation position where the hook 156 can be hooked to the shackle 504 as shown in FIG. 5C. Therefore, the hook 156 can be hooked to the shackle 504 only by remote control. Therefore, it is not necessary for a person to intervene near the container 500 to hook the crane hoisting tool to the shackle 504, and the safety of the operation of hooking the hook 156 to the shackle 504 can be ensured. In addition, the lost time of the above operation can be reduced and labor can be saved.

[0065] 2, a cam hole 154a is formed in the upper part of the engaging part 150. A shaft 157 attached to the lower end of the arm 101 is inserted into the cam hole 154a, and the engaging part 150 is attached to the lower end of the arm 101 so as to be able to swing.

[0066] According to this, when the arm 101 is moved downward after the engaging portion 150 is brought into contact with the ground G, the cam hole 154a allows the engaging portion 150 to be appropriately rotated to a rotation position where the hook 156 can be hooked onto the shackle 504. Therefore, the hook 156 can be reliably hooked onto the shackle 504.

[0067] 2, the cam hole 154a is composed of a first cam hole 154a1 and a second cam hole 154a2. The first cam hole 154a1 is an elongated hole whose longitudinal direction coincides with the vertical line. The second cam hole 154a2 is an elongated hole whose upper rear end is connected to the lower end of the first cam hole 154a1 and is formed downward and forward from the connection with the first cam hole 154a1.

[0068] According to this, when the shaft 157 enters the second cam hole 154a2 from the first cam hole 154a1, the upper part of the engaging part 150 rotates in a direction away from the container 500. Therefore, the engaging part 150 can be rotated more reliably to the rotation position where the hook 156 can be hooked on the shackle 504.

[0069] As shown in FIG. 2, an inclined surface 154a3 is formed on the inner surface on the rear side of the connection between the first cam hole 154a1 and the second cam hole 154a2, the inclined surface 154a3 gradually increasing in size toward the front as it extends downward.

[0070] According to this, when the shaft 157 reaches the inclined surface 154a3 from the first cam hole 154a1, the upper part of the engaging part 150 rotates in a direction away from the container 500. Therefore, the engaging part 150 can be rotated more reliably to a rotation position where the hook 156 can be hooked onto the shackle 504. Also, the engaging part 150 can be rotated smoothly.

[0071] As shown in FIG. 2, the cross-sectional shape of the inclined surface 154a3 is an arc shape.

[0072] This allows the engagement portion 150 to rotate more smoothly.

[0073] 2, a cylindrical bushing 166 is attached to the shaft 157 so as to be rotatable relative to the shaft 157. The bushing 166 comes into contact with the inner circumferential surface of the cam hole 154a.

[0074] This can reduce wear on the shaft 157 compared to a structure in which the shaft 157 directly contacts the cam hole 154a. Also, because the bush 166 contacting the cam hole 154a is rotatable with respect to the shaft 157, wear on the bush 166 contacting the cam hole 154a can also be reduced.

[0075] As shown in FIG. 2, an upper weight 155 is provided at the upper rear portion of the engagement portion 150.

[0076] According to this, when the engaging part 150 starts to rotate after abutting on the ground G (the state of FIG. 5(B)), a force in a direction in which the upper part of the engaging part 150 moves away from the container 500 is applied to the engaging part 150 by the upper weight 155. This makes it possible to rotate the engaging part 150 more reliably. Also, as shown in FIG. 5(D), when the arm 101 is moved upward after the engaging part 150 rotates, the action of the upper weight 155 maintains the rotated state of the engaging part 150. This makes it possible to reliably hook the hook 156 onto the shackle 504.

[0077] As shown in FIG. 2, the lower rear end of the engagement portion 150 is formed with a first tilting notch 151b and a second tilting notch 158a.

[0078] According to this, after the engaging portion 150 comes into contact with the ground G, the engaging portion 150 can be rotated more reliably.

[0079] 2, a lower weight 158 ​​is provided at the lower rear end of the engaging portion 150.

[0080] According to this, the center of gravity of the engaging part 150 can be lowered further, and the engaging part 150 can be grounded on the ground G more reliably when the engaging part 150 rotates, and the engaging part 150 can be rotated more stably. In other words, it is possible to suppress unintended rotation of the engaging part 150 caused by the engaging part 150 suddenly rotating due to the lower end of the engaging part 150 slipping off the ground G, etc., and the first surface 151g and the second surface 158b suddenly colliding with the ground G. Therefore, the engaging part 150 can be rotated to a rotation position where the hook 156 is reliably hooked on the shackle 504.

[0081] (Other embodiments) The present invention has been described above in relation to the embodiment that is considered to be the most practical and preferable at this time. However, the present invention is not limited to the embodiment disclosed in this specification, and can be modified as appropriate within the scope of the claims and the gist or concept of the invention that can be read from the specification as a whole, and it should be understood that a crane hoisting gear 100 with such modifications is also included within the technical scope.

[0082] In the embodiment described above, the vessel 500 is a ladle that contains molten metal, but the vessel 500 is not limited to a ladle and may be a vessel that contains and transports objects such as raw materials, feed, waste, etc. Also, the shape of the vessel 500 may be a box shape, etc.

[0083] In the embodiment described above, the main body member 151 and the guide plate 154 are separate bodies, but the main body member 151 and the guide plate 154 may be integrated together.

[0084] In the embodiment described above, the main body member 151 and the hook 156 are separate bodies, but the main body member 151 and the hook 156 may be integrated.

[0085] In the embodiment described above, the main body member 151 and the upper weight 155 are separate bodies, but the main body member 151 may be integrated with the upper weight 155. For example, a portion that performs the same function as the upper weight 155 may be formed at the upper rear end of the main body member 151 by making the upper rear end of the main body member 151 thicker than other portions, or by forming a portion that protrudes further rearward from the upper rear end of the main body member 151.

[0086] In the embodiment described above, the main body member 151 and the lower weight 158 ​​are separate bodies, but the main body member 151 and the lower weight 158 ​​may be integrated together. For example, the thickness of the lower end of the main body member 151 may be made thicker than other parts, thereby forming a portion at the lower end of the main body member 151 that performs the same function as the lower weight 158. [Explanation of symbols]

[0087] 100 Crane hoisting equipment 101 Arm 150 Engagement part 151 Main body parts 151b First tilting notch 154a Cam hole 154a1 First cam hole 154a2 Second cam hole 154a3 Slope 155 Upper weight 156 Hook 157 Shaft 158 Lower Weight 158a Second tilt notch 166 Bush

Claims

1. An arm (101); and an engagement portion (150) pivotally attached to the lower end of the arm and having a hook (156) provided in front of the lower end.

2. A cam hole (154a) is formed in the upper part of the engagement portion, 2. A crane hoisting device as described in claim 1, characterized in that a shaft (157) attached to the lower end of the arm is inserted into the cam hole, and the engagement portion is attached to the lower end of the arm in a swingable manner.

3. The cam hole is composed of a first cam hole (154a1) and a second cam hole (154a2), The first cam hole is an elongated hole, and a longitudinal direction of the first cam hole coincides with a vertical line.

3. A crane hoisting device as described in claim 2, characterized in that the second cam hole has an elongated hole shape, an upper rear end connected to the lower end of the first cam hole, and is formed downward and forward from the connection portion with the first cam hole.

4. A crane hoisting device as described in claim 3, characterized in that an inclined surface (154a3) that moves downward and toward the front is formed on the inner surface of the rear side of the connection between the first cam hole and the second cam hole.

5. 5. The crane hoisting device according to claim 4, wherein the cross-sectional shape of the inclined surface is an arc shape.

6. A cylindrical bush (166) is mounted on the shaft so as to be rotatable relative to the shaft; 3. The crane hoisting device according to claim 2, wherein the bush abuts against an inner peripheral surface of the cam hole.

7. 2. A crane hoisting device according to claim 1, characterized in that an upper weight (155) is provided at the upper rear of the engagement portion.

8. 2. A crane hoisting device according to claim 1, characterized in that a tilting notch (151b, 158a) is formed at a lower rear end of the engagement portion.

9. 2. A crane hoisting device according to claim 1, characterized in that a lower weight (158) is provided at a lower end of the engagement portion.

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