KR20210065770A - Hook - Google Patents

Abstract

The present invention relates to a hook, comprising a hook body having a curved surface at least in part so as to wrap at least a part of an object to be processed; and a rotating body provided on the hook body so as to be in contact with the object to be processed. The lifetime can be improved by reducing frictional resistance with the object to be processed.

Description

hook {Hook}

The present invention relates to a hook, and more particularly, to a hook capable of improving lifespan by reducing frictional resistance with an object to be treated.

In general, a ladle may be used as a container for moving or performing an operation while maintaining a temperature containing a melt such as molten iron or molten steel. For example, the ladle may inject molten steel into the tundish after it is seated in the ladle turret in a state in which the refining is completed molten steel is accommodated therein. When the molten steel accommodated in the ladle is injected into the tundish, the ladle may be transferred to the slag removal plant using a crane or the like in order to remove the slag remaining in the ladle. When using the ladle in this way, the hook of the crane is fastened to the trunnion formed on both sides of the ladle, and the auxiliary hook is connected to the tilt holder connected to the lower part of one side of the ladle. can be transported to the field.

Afterwards, when the ladle arrives at the slag removal site, the hook and the auxiliary hook are lowered to position the ladle at the slag removal position, and then, when the auxiliary hook is raised, the ladle is tilted with the trunnion connected to the hook as the rotation axis and remains inside the ladle. slag may be discharged to the outside. And when the slag is discharged, the auxiliary hook can be raised to return the ladle to its original position.

However, in the process of returning the ladle, the trunnion causes friction with the hook, and the phenomenon that the ladle does not return to its original position often occurs. Accordingly, a lubricant is applied to the surface of the hook in contact with the trunnion, or a lubricating liner is formed. However, since the surface of the hook in contact with the trunnion is exposed to the outside as it is, the time for which the lubricant is maintained is short, and the operator has to frequently apply the lubricant to the hook, thereby increasing the workload of the operator. In addition, since the liner formed on the hook is easily worn due to continuous friction with the trunnion, it is necessary to periodically replace the liner, so there is a problem in that the replacement of the liner is expensive.

US 10-0891811 B US 10-2008-0109394 A

The present invention provides a hook capable of improving lifespan by reducing frictional resistance with an object to be treated.

The present invention provides a hook capable of returning a heavy object to its original position.

The present invention provides a hook that can reduce the work load of the operator and can reduce the maintenance cost.

A hook according to an embodiment of the present invention includes a hook body having a curved surface at least in part so as to wrap at least a portion of an object to be processed; and a rotating body provided on the hook body so as to be in contact with the target object.

The hook body includes a support portion extending in the vertical direction, and a ring portion connected to the lower portion of the support portion so as to wrap at least a portion of the object to be processed,

The rotating body may be provided in the ring portion.

The hook body may include a fixing groove for inserting a part of the rotating body.

The fixing groove may be formed to have a depth greater than a radius of the rotating body and shallower than a diameter of the rotating body.

The hook body may include an injection hole for communicating the fixing groove and the outside of the fixing groove.

The injection hole may be formed at a position higher than the bottom of the fixing groove.

The rotating body may be disposed to be in contact with the object to be processed at a plurality of positions when the object to be processed is seated on the hook body.

The rotating body may be in line contact with the outer peripheral surface of the object to be processed.

The rotating body may be in point contact with the outer peripheral surface of the object to be processed.

It may include a liner provided on the hook body to surround the outside of the rotation body.

The hook body may include a plurality of plates and a fastening member for connecting the plurality of plates.

The rotating body may include at least one of a roller, a bearing, and a ball.

The target object includes a ladle, and the hook body is fastened to a trunnion provided in the ladle to hoist and hoist the ladle, and may include a connector for connecting to a wire of a crane.

According to the embodiment of the present invention, when transporting or handling a heavy object by hanging on the hook of the crane, it is possible to extend the life of the hook by reducing the frictional resistance between the hook and the heavy object, and the work load of the operator that may occur due to wear and maintenance costs can be reduced. In addition, it is possible to suppress or prevent a phenomenon in which the heavy object deviates from the intended position, so that the operation using the heavy object can be stably performed.

1 is a view showing a state in which the ladle is hoisted using a hook according to an embodiment of the present invention.
Figure 2 is a perspective view of a hook according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of the hook taken along the line A-A' shown in Fig. 2;
Fig. 4 is a cross-sectional view of the hook taken along the line B-B' shown in Fig. 2;
5 is a perspective view of a hook according to a modified example of the present invention.
6 is a view showing a state of adjusting the position of the container using a hook according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and will be implemented in various different forms. Only the embodiments of the present invention are provided so that the disclosure of the present invention is complete and to fully inform those of ordinary skill in the art the scope of the invention. In order to explain the embodiment of the present invention, the drawings may be exaggerated or enlarged, and the same reference numerals in the drawings refer to the same elements.

1 is a view showing a state in which the ladle is hoisted using a hook according to an embodiment of the present invention.

Before describing the hook according to an embodiment of the present invention, the container 100 for fastening to the hook will be described.

Referring to FIG. 1 , the container 100 may be formed in a hollow shape to accommodate the contents therein. And the container 100 may have an open top so that the contents can be injected and discharged therein. For example, the container 100 may be a ladle that stores and transports molten iron such as molten iron or molten steel in a steel mill.

The container 100 is a heavy object, and may be transported and tilted using a crane. Accordingly, the first locking body 110 for connecting the hook of the crane may be formed on the outer circumferential surface of the container 100 .

The first locking body 110 may be formed to protrude from the outer peripheral surface of the container 100 so that the hook 300 can be bound. The first locking body 110 is also called a trunnion, and a pair may be formed to face each other on the outer peripheral surface of the upper side of the container 100 . The first locking body 110 may be formed in an approximately cylindrical bar shape having a curved surface. In this case, the direction in which the first locking body 110 extends may mean a longitudinal direction of the first locking body 110 .

In addition, the container 100 may have a second locking body 120 formed therein. The second locking body 120 may be formed to protrude from the outer circumferential surface of the container 100 so as to be bound to the apparatus 200 for a ladle for tilting the container 100 , and a position lower than the first locking body 110 . , for example, may be formed on the outer peripheral surface of the lower side of the container 100 . In this case, the first locking body 110 may be formed in a direction crossing the virtual line connecting the pair of second locking bodies 120 . The second locking body 120 can maintain a bond with the device 200 for the ladle when transporting the container 100 or adjusting the height of the container 100, and for the ladle when the container 100 is tilted. It may be formed in a ring shape so as to be able to release the bond with the device 200 .

Accordingly, the hook 300 is bound to the first locking body 110 , and the device 200 for the ladle, which is bound to the auxiliary hook 400 , is bound to the second locking body 120 . By hoisting and unwinding the hook 300 and the auxiliary hook 400 respectively connected to the outer ear (340, 410), the height of the container 100 can be adjusted, or the tilt angle of the container 100 can be adjusted. In this case, the first locking body 110 may serve as a rotation center during the tilting operation of the container 100 .

2 is a perspective view of a hook according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of the hook taken along the line A-A' shown in FIG. 2, and FIG. 4 is a perspective view taken along the line B-B' shown in FIG. A cross-sectional view of the hook. In FIG. 3 , the longitudinal direction, the width direction, and the height direction refer to directions set with respect to the hook body 310 . At this time, the length direction of the hook body 310 may mean a radial direction of the first locking body 110 , and the width direction of the hook body 310 is the direction in which the first locking body 110 extends, that is, the first locking body 110 . 1 may refer to the longitudinal direction of the locking body 110 .

Referring to FIG. 2 , the hook 300 according to an embodiment of the present invention may be in contact with the hook body 310 having a curved surface at least in part and at least a portion of the object to be processed so as to wrap at least a portion of the object to be processed. It may include a rotating body 320 provided on the hook body 310 . Here, the object to be processed includes a container 100 capable of accommodating the melt, and the hook 300 may be fastened to the first stopper 110 of the container 100 , that is, the trunnion.

The hook body 310 is formed with an opening 316 for inserting at least a portion of the container 100, for example, the first locking body 110, and a support portion I extending in the vertical direction, and the support portion I. It may include a ring portion (II) connected to the lower portion. At this time, the support part (I) of the hook body 310 may be formed with a connector 314 for connecting to the wire 340 of the crane. And an opening 316 may be formed in the hook portion II of the hook body 310 to insert the first locking body 110 , and the first locking body 110 may be formed inside the opening 316 . A fastening space 317 for seating and fastening may be formed. At this time, the fastening space 317 may include a curved surface so as to wrap at least a part of the cylindrical first locking body 110 in the circumferential direction. The vertical direction in the hook body 310 is referred to as a height direction. And the radial direction of the ring portion (II) based on the ring portion (II) formed in a substantially circular arc shape is referred to as the longitudinal direction, and the direction perpendicular to the horizontal direction with respect to the longitudinal direction is referred to as the width direction.

The hook body 310 may include a plurality of plates 311 and 312 and a coupling member 313 for coupling the plurality of plates 311 and 312 . A plurality of plates (311, 312) is a pair of first plates (311: 311a, 311b) arranged to be spaced apart, and at least one second plate (312: 312a to 312g) provided between the first plate (311) may include. The number of the second plates 312 may vary depending on the weight of the object to be handled using the hook 300 , and may be added or subtracted according to the weight of the object to be processed. Here, an example in which the second plate 312 is seven will be described, and the hook body 310 may be formed of a total of nine plates. Here, an example of using the hook body 310 by combining a plurality of plates 311 and 312 will be described, but the hook body 310 may be formed as a single structure.

The first plate 311 may be formed so that the second plate 312 has a shape including a support part (I) and a ring part (II), and the first plate 311 and the second plate 312 are connected to each other. It may be formed to have the same size when overlapped. Alternatively, the area of the second plate 312d disposed in the middle of the plates 311 and 312 constituting the hook body 310 is the largest, and the area of the remaining plates increases toward the outside, for example, the first plate 311. It may be formed to decrease.

Also, both the first plate 311 and the second plate 312 may be formed to have the same thickness, and the first plate 311 and the second plate 312 may be formed to have different thicknesses. For example, the first plate 311 may be formed thicker than the second plate 312 , and the first plate 311 may be formed thinner than the second plate 312 . In addition, the second plates 312 may all be formed to have the same thickness or may be formed to have different thicknesses.

The first plate 311 and the second plate 312 may be coupled by a coupling member 313 to form the hook body 310 . At this time, the coupling member 313 may be provided to penetrate the first plate 311 and the second plate 312 at a plurality of points, through which the first plate 311 and the second plate 312 are connected to each other. can be combined. As the coupling member 313, a bolt and a nut may be used, or a rivet may be used, but various types of coupling members 313 may be used without being limited thereto. Here, the first plate 311 and the second plate 312 are described as being coupled using the coupling member 313, but the first plate 311 and the second plate 312 may be coupled through welding, etc. may be

Meanwhile, a fixing groove 318 for installing the rotating body 320 may be formed in the hook body 310 . In this case, the fixing groove 318 may be formed in the fastening space 317 formed in the ring portion II of the hook body 310 . The fixing groove 318 may be concavely recessed in the bottom surface in contact with the first locking body 110 when the first locking body 110 is seated in the fastening space 317 . Before describing the fixing groove 318, the rotating body 320 will be described first.

The rotating body 320 may include a rotating shaft 322 and a roller 326 rotatably provided outside the rotating shaft 322 . At this time, when the first locking body 110 is inserted or fastened to the fastening space 317 of the hook body 310 , the rotating body 320 contacts at a plurality of positions in the longitudinal direction of the first locking body 110 . As possible, the first locking body 110 and the rotating body 320 may be arranged side by side. That is, the rotating body 320 may be installed to extend along the width direction of the hook body 310 . In addition, one roller 326 may be provided on the rotating shaft 322 to extend along the longitudinal direction of the rotating shaft 322 , and a plurality of rollers 326 may be provided, for example, divided into two. Alternatively, a plurality of rotation shafts 322 may be provided, and a roller 326 may be provided for each rotation shaft 322 , respectively. In this case, the plurality of rotation shafts 322 may be arranged in a line along the width direction of the hook body 310 . The roller 326 may be connected to the rotation shaft 322 so as to freely rotate through contact with the first locking body 110 . In this case, a rotating member 324 such as a bearing may be provided between the rotating shaft 322 and the roller 326 to prevent frictional resistance between the roller 326 and the rotating shaft 322 . In addition, for lubrication of the rotation shaft 322 and the roller 326 or the rotation member 324 , a flow path 323 for injecting a lubricant into the rotation shaft 322 may be formed.

The rotating body 320 may be installed on the hook body 310 so as to be in contact with at least a portion of the first locking body 110 . The rotating body 320 may be provided so as to be in line contact with the outer peripheral surface of the eleventh locking body 110 . In this case, the rotating body 320 may be installed in the fixing groove 318 formed in the hook body 310 . Referring to FIG. 4 , the fixing groove 318 may be formed by processing the first plate 311 and the second plate 312 constituting the hook body 310 . At this time, a concave groove may be formed in the inner surface facing the second plate 312 so that the end of the rotation shaft 322 of the rotating body 320 can be inserted into the first plate 311 . In addition, concave grooves into which at least a portion of the roller 326 can be inserted may be formed in the second plate 312 . In this case, the concave grooves formed in the first plate 311 and the second plate 312 may have the same shape or different shapes depending on the shape and size of the rotating body 320 . The fixing groove 318 may be formed by a concave groove formed in the first plate 311 and a concave groove formed in the second plate 312 . That is, a concave groove is formed in each of the first plate 311 and the second plate 312 , and the hook body 310 is formed by combining the first plate 3110 and the second plate 312 , each The concave grooves are connected to each other along the width direction of the hook body 310 to form a fixing groove 318 into which the rotating body 320 can be inserted and fixed. At this time, when the roller 326 is divided into two as shown in FIG. 4 , an insertion hole (not shown) into which the rotation shaft 322 can be inserted may be formed in the second plate 312d disposed in the middle.

The fixing groove 318 may be formed to a depth capable of protruding a portion of the rotating body 320 . That is, the rotation body 320 installed on the hook body 310 is in contact with the first locking body 110 , the hook body 310 , for example, the position of the first locking body 110 in the fastening space 317 . can be used to adjust Therefore, the fixing groove 318 can protrude at least a portion of the rotating body 320 so that the rotating body 320 can come into contact with the first locking body 110 , while the rotating body 320 is not separated from the degree of separation. depth can be formed. For example, the fixing groove 318 may be formed to be deeper than the radius of the rotating body 320 and shallower than the diameter of the rotating body 320 . The rotating body 320 may be installed in the fixing groove 318 in the process of fastening the first plate 311 and the second plate 312 .

When the rotating body 320 is installed in the fixing groove 318 of the hook body 310, that is, the hook body 310, the lubricant is injected into the flow path 323 formed on the rotating shaft 322 by the first plate 311. There are difficulties. Accordingly, by forming the inlet 315 communicating with the flow path 323 or the fixing groove 318 in the first plate 311 , the lubricant can be smoothly injected into the rotating body 320 installed in the fixing groove 318 . In this case, the injection hole 315 may be formed at a position higher than the bottom surface of the fixing groove 318 . This is to prevent the lubricant injected into the fixing groove 318 through the inlet 315 from flowing out again through the inlet 315 . Through this, the lubricant injected into the fixing groove 318 may maintain the lubricating ability of the rotation shaft 322 and the rotation member 324 or the rotation member 324 while staying in the fixing groove 318 . In addition, since the lubricant is retained in the fixing groove 318, it is possible to extend the injection period of the lubricant.

Here, since the first locking body 110 is supported by the rotating body 320 , direct contact between the first locking body 110 and the hook body 310 can be suppressed, but the fastening space of the hook body 310 . When the position of the first locking body 110 is not properly adjusted in 317 , the first locking body 110 may be in direct contact with the hook body 310 . Accordingly, a liner 330 may be additionally installed on the hook body 310 to prevent the first locking body 110 from directly contacting the hook body 310 . The liner 330 may be replaceably connected to the hook body 310 , and may be formed using a metal material having a lower frictional resistance with the first locking body 110 than the hook body 310 . The liner 330 is provided on the surface in contact with the hook body 310 when the first locking body 110 is seated in the fastening space 317 , for example, on the outside of the fixing groove 318 or on the outside of the rotating body 320 . can be That is, the liner 330 has a through hole 332 through which the rotating body 320 can be exposed so that the rotating body 320 protruding from the fixing groove 318 can contact the first locking body 110 . can be formed. Through this configuration, the liner 330 may be provided in a form surrounding the rotating body 320 on the hook body 310 . The liner 330 may prevent the rotating body 320 from being separated from the fixing groove 318 . That is, since the fixing groove 318 is formed to a size capable of constraining the rotating body 320, the rotating body 320 has the fixing groove (311) in the process of coupling the first plate 311 and the second plate 312. 318) can be installed. However, when the fixing groove 318 is formed so that the rotation body 320 can be inserted and detached for smooth replacement of the rotation body 320 , the rotation body 320 is moved from the fixing groove 318 by using the liner 330 . It can also prevent escaping. In this case, if the size of the through hole 332 and at least the length of the through hole 332 in the longitudinal direction of the hook body 310 are shorter than the diameter of the roller 326 constituting the rotating body 320, the rotating body It is possible to effectively prevent the 320 from being separated from the fixing groove 318 .

On the other hand, the rotating body 320 is arranged to extend along the width direction of the hook body 310 on the surface on which the first locking body 110 is seated in the fastening space 317, and is in contact with the first locking body 110 . It may be provided on the hook body 310 to enable it. This is arranged in the width direction of the hook body 310 when the first locking body 110 formed in a cylindrical shape is seated in the fastening space 317 of the hook body 310, and the rotating body 320 is connected to the first locking body. (110) to adjust the position of the first locking body (110). Accordingly, the rotating body 320 is disposed in parallel with the first locking body 110 in the fastening space 317, and rotates through contact with the first locking body 110 to determine the position of the first locking body 110 . Can be adjusted. One rotating body 320 may be installed on the hook body 310 , but a plurality of, for example, two rotating bodies 320 may be installed. When the plurality of rotating bodies 320 are installed in the hook body 310 , the plurality of rotating bodies 320 may be spaced apart from each other in the longitudinal direction of the hook body 310 to be provided in parallel with each other. That is, the plurality of rotating bodies 320 may be provided to form a plurality of rows in the longitudinal direction of the hook body 310 . When the plurality of rotation bodies 320 are installed in the longitudinal direction of the hook body 310 in this way, the plurality of rotation bodies 320 are in line contact at a plurality of points in the circumferential direction of the first locking body 110 , the first While lubricating between the locking body 110 and the hook body 310, it is possible to perform an action of returning the first locking body 110 to its original position. In addition, since the plurality of rotating bodies 320 can support the first locking body 110 , the contact area between the first locking body 110 and the hook body 310 is suppressed, or the contact area is reduced, 1 It is possible to suppress the wear of the hook body 110 or the hook body 310 . To this end, when the first locking body 110 is fastened to the hook body 310 and hoisted, the plurality of rotation bodies 320 so that the first locking body 110 can be supported by the plurality of rotation bodies 320 . ) should be placed adjacent to each other. The plurality of rotating bodies 320 may be spaced apart so as to stably support the first locking body 110 without contacting each other. For example, when the diameter of the first locking body 110 is R, the separation distance L between the rotating bodies 320 may be expressed as the following formula. In this case, the separation distance L is a distance from the center of the rotating body 320 to the center of the adjacent rotating body 320 , and may mean a circumferential distance of the first engaging body 110 or the hook body 310 . . If the separation distance L between the rotating bodies 320 is greater than the suggested range, the first locking body 110 is not supported by the rotating body 320 and directly to the hook body 310 through between the rotating bodies 320 . Since it is in contact, there is a problem in that it is difficult to suppress the wear of the hook body 310 .

expression)

When the first engaging body 110 is seated on the hook body 310 and the container 100 is hoisted up, the rotating body 320 is the bottom surface of the fastening space 318 in which the first engaging body 110 is directly seated. It may be installed only on the first stopper 110 , and a plurality of pieces may be installed spaced apart along the circumferential direction of the first locking body 110 that is not in direct contact with the first locking body 110 . This means that in the process of handling the container 100, the first locking body 110 flows in the fastening space 318 and contacts the wall surface of the fastening space 318, that is, the hook body 310 to cause friction or change the position. because it can be

Here, an example in which the rotating body 320 includes a roller has been described, but the rotating body 320 may be formed in various shapes such as bearings and balls.

5 is a perspective view of a hook according to a modified example of the present invention, showing an example in which the rotating body is formed of a ball. In this way, when the rotating body 320a is formed in a ball shape, at least two or more rotating bodies 320a may be installed on the hook body 310 . Accordingly, the rotating body 320a may make point contact with the first locking body 110 at a plurality of positions to perform a lubricating action between the first locking body 110 and the rotating body 320a. The rotating body 320a may be arranged in a line along the width direction of the hook body 310 . These rotating bodies 320a may be arranged to form a plurality of rows along the length direction of the hook body 310 . In this case, when the first locking body 110 deviates from its original position in the fastening space 317 , the rotating body 320a rotates due to contact with the first locking body 110 to lock the first locking body 110 . It can be smoothly returned to its original position.

A fixing groove (not shown) into which the ball-shaped rotating body 320a can be inserted may be formed in the hook body 310 . In this case, the fixing groove is deeper than the radius of the rotation body 320a so that the rotation body 320a can contact the first locking body 110 and prevent it from being separated from the fixing groove, and the rotation body 320a. It may be formed to have a depth shallower than the diameter of . In addition, a liner 330 may be provided on the hook body 310 to prevent the first locking body 110 from directly contacting the hook body 310 . At this time, the liner 330 may be formed with a through hole 332 through which the rotating body 320a may be exposed. In this case, the through hole 332 may be formed in a circular shape. The through hole 332 may have a shorter diameter than the diameter of the rotating body 320a, thereby preventing the rotating body 320a from being separated from the fixing groove by the liner 330 .

In this way, when a ball is used as the rotating body 320a, the position of the first locking body 110 can be more smoothly adjusted because the ball can rotate in all directions within the fixing groove 318 . In addition, since the contact area between the rotating body 320a and the first engaging body 110 is reduced, it is possible to suppress the wear of the first engaging body 110 or the rotating body 320a.

Hereinafter, a method for adjusting the position of a container using a hook according to an embodiment of the present invention will be described.

6 is a view showing a state of adjusting the position of the container using a hook according to an embodiment of the present invention.

First, the contents, for example, the container 100 in which the melt is accommodated may be transported to a place where the operation is performed using a crane. At this time, the hook 300 of the crane may be bound to the first locking body 110 , and the auxiliary hook 400 may be bound to the device 200 for the ladle. In this case, the hook 300 and the auxiliary hook 400 may be disposed at a position capable of maintaining the container 100 in a vertical state so that the melt accommodated in the container 100 does not flow to the outside.

In this state, the container 100 may be tilted to discharge the melt accommodated in the container 100 . In this case, the molten material accommodated in the container 100 can be discharged by maintaining the height of the hook 300, lifting the auxiliary hook 400 to pull the lower part of one side of the container 100 to tilt the container 100. .

Thereafter, when the melt accommodated in the container 100 is completely discharged, before the container 100 is tilted, for example, it may be returned to an initial state. At this time, the height of the hook 300 is maintained and the container 100 can be returned to the initial state by lowering the lower part of one side of the container 100 by lowering the auxiliary hook 400 . The container 100 is rotated using the first locking body 110 as a rotation axis in a state in which the first locking body 110 is fastened to the hook 300 . At this time, since the first locking body 110 is in contact with the rotation body 320 installed on the hook body 310 , when the first locking body 110 rotates, the rotation body 320 is also the first locking body 110 . ) while rotating with the first locking body 110 can be adjusted to return to the original position. Accordingly, the container 100 may be returned to its initial state.

It should be noted that the above embodiments of the present invention are intended to illustrate the present invention and not to limit the present invention. The present invention will be embodied in various different forms within the scope of the claims and equivalents thereof, and those skilled in the art to which the present invention pertains will understand that various embodiments are possible within the scope of the technical spirit of the present invention. will be able

100: vessel 200: device for ladle
300: hook 310: hook body
320, 320a: rotating body 330: liner

Claims (13)

a hook body having a curved surface at least in part so as to wrap at least a portion of the object to be processed; and
A hook comprising a; a rotating body provided on the hook body so as to be in contact with the object to be processed. The method according to claim 1,
The hook body includes a support portion extending in the vertical direction, and a ring portion connected to the lower portion of the support portion so as to wrap at least a portion of the object to be processed,
The rotating body is a hook provided in the ring portion. 3. The method according to claim 2,
The hook body includes a fixing groove for inserting a part of the rotating body. 4. The method according to claim 3,
The fixing groove is deeper than the radius of the rotating body, the hook is formed to have a depth shallower than the diameter of the rotating body. 5. The method according to claim 4,
The hook body includes an injection hole for communicating the fixing groove and the outside of the fixing groove. 6. The method of claim 5,
The inlet is a hook formed at a position higher than the bottom of the fixing groove. 7. The method of claim 6,
The rotating body is a hook disposed so as to be able to contact the target object at a plurality of positions when the target object is seated on the hook body. 8. The method of claim 7,
The rotating body is a hook capable of line contact with the outer peripheral surface of the object to be processed. 9. The method according to claim 7 or 8,
The rotating body is a hook capable of point contact with the outer peripheral surface of the object to be treated. 10. The method of claim 9,
A hook including a liner provided on the hook body to surround the outside of the rotating body. 11. The method of claim 10,
The hook body includes a plurality of plates and a fastening member for connecting the plurality of plates. 12. The method of claim 11,
The rotating body is a hook including at least one of a roller, a bearing, and a ball. 13. The method of claim 12,
The object to be treated includes a ladle,
The hook body is fastened to a trunnion provided in the ladle to hoist and hoist the ladle, a hook including a connector for connecting with a wire of a crane.

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