JP2009160648A - Handle rotating device for ladle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a more inexpensive handle rotating device for ladle which can easily rotate an arm in a short period of time. <P>SOLUTION: The arm 3 for suspending is rollably supported to the spindle 7 of a ladle 1, and a rolling means 10 is provided between the arm 3 and the spindle 7. The rolling means 10 has a function of rolling the arm 3 around the axis of the spindle 7 by rotating a handle 16. A driving roller 21 is pressed against the outer circumference 16a of the handle 16, and the driving roller 21 is rotated by driving force, so as to rotate the handle 16, and the arm 3 is rolled. The handle 16 is provided at a holding member rolling around the axis of the spindle 7 integrally with the arm 3. When the arm 3 rolls, the rotary center of the handle 16 moves to the circumference of the axis of the spindle 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ladle handle rotating device that rotates an arm of a hanging ladle device for molten metal.

  In the process of handling molten metal in a foundry or the like, a hanging ladle device (casting device) is used to transport the molten metal to the next process.

  For example, as shown in FIG. 6 (a), a conventional hanging ladle device has legs 3a, 3a extending downward at both ends of a spanning portion 3b extending horizontally in a ladle 1 capable of accommodating molten metal. A gate-shaped arm 3 provided with is attached. The hanging portion 3b is provided with a hook 2 for hanging.

  The ladle 1 has the cylindrical surrounding wall part 4 and the bottom part 5, and can put molten metal into the inside from upper opening. Moreover, since the heat insulating material 6 is provided along the inner surface of the ladle 1, the temperature fall of the molten metal accommodated in the inside can be prevented.

  A support shaft 7 protruding outward is provided on the peripheral wall portion 4 of the ladle. The support shafts 7 are joined to both sides of the ladle 1 with respect to the cylinder shaft, and the shaft centers of both support shafts 7 and 7 are concentric.

  A holding portion 3c having an insertion hole 3d through which the support shaft can be inserted is provided at the lower ends of both leg portions 3a, 3a of the arm 3. The supporting shafts 7 and 7 are inserted into the insertion holes 3d and 3d of the holding portions 3c and 3c, and the arm 3 is supported so as to be rotatable in the lateral direction with respect to the ladle 1.

  Further, a rotating means 10 is attached between the holding portion 3 c of the arm 3 and one support shaft 7 joined to the ladle 1.

In the configuration of the rotating means 10, a holding member 12 is raised on a mounting plate 11 that is integrally joined to the holding portion 3 c of the arm 3. The support shaft 7 is rotatably inserted into the holding member 12. A worm wheel 17 is attached to the outer periphery of the support shaft 7.
In the plan view shown in FIG. 6B, the holding member 12 is provided with a worm shaft 18 that faces in a direction orthogonal to the axial direction of the support shaft 7, and a worm (screw gear) 19 of the worm shaft 18. Meshes with the worm wheel 17.

An operation shaft 13 is inserted through the holding member 12 so as to face in a direction parallel to the axial direction of the one support shaft 7. An annular handle 16 is attached to the operation shaft 13, and when the handle 16 is manually rotated, the operation shaft 13 rotates about the axis.
A bevel gear 14 is attached to the operation shaft 13, and the bevel gear 14 meshes with a bevel gear 15 provided on the worm shaft 18.

By the way, when the molten metal accommodated in the ladle 1 is subjected to a molten metal treatment such as a graphite spheroidizing process, a lid is attached to the ladle 1 in order to prevent the molten metal from being ejected.
When the lid is placed on the ladle 1, there is a hanging portion 3 b of the arm 3 at the top of the ladle 1, so the handle 16 of the rotating means 10 is turned so that the arm 3 falls with respect to the ladle 1. Rotate. If the arm 3 falls down and the transfer part 3b retreats from the opening of the ladle 1, the lid can be lowered from directly above the ladle 1.
If the lid is removed after the molten metal treatment is finished and the handle 16 is turned in the opposite direction, the arm 3 rises upward and returns to the original state, so that the hook 2 of the spanning portion 3b is positioned directly above the ladle 1 To do. For this reason, the ladle 1 can be lifted and conveyed to the next process by hooking the hook 2 with a lifting machine such as a crane (for example, see Patent Document 1).

  Moreover, the technique which performs rotation of the arm 3 with respect to the ladle 1 using the electric drive means integrally provided in the ladle 1 is also disclosed (for example, refer patent document 2 and patent document 3).

JP-A-2-179352 JP-A-6-285615 JP 2001-179427 A

When the arm 3 of the ladle 1 is manually rotated, it is necessary to arrange an operator for each step of rotating the arm 3, which leads to an increase in cost.
Moreover, since the arm 3 is a very heavy member, the operation | work which rotates the handle | steering-wheel 16 of the rotation means 10 requires a great effort, and a long working time is required.

In particular, the ladle 1 having a large weight has several tons, and the arm 3 that supports the heavy object also has a considerable weight. In order to rotate the arm 3 as described above, the worker is heavy labor to operate the handle 16 while putting the entire weight on the handle 16.
Furthermore, when the arm 3 is rotated in the direction in which the arm 3 is raised, a larger force is required than in the case where the arm 3 is rotated in the direction in which the arm 3 is tilted, and there is a problem that a longer work time is required.

  Therefore, as in Patent Documents 2 and 3, it is effective in facilitating the work and shortening the time to provide a driving means for turning the arm in the ladle device and to turn the arm by the driving force of the driving means. is there.

  However, providing the ladle drive means in the ladle device leads to an increase in size and complexity of the device. Moreover, it is not preferable to provide driving means for each of the ladle devices because it increases the cost of capital investment and the cost of maintenance.

  Furthermore, since a power source is required to operate the drive device, a device for connecting or disconnecting the power source or an operator who performs the power source is required in the step of rotating the arm. For this reason, providing a driving means in the ladle device may not always be effective from the viewpoint of cost reduction.

  Accordingly, an object of the present invention is to provide a device that can easily rotate the arm in a short time and that can be manufactured at a lower cost.

  In order to solve the above-described problems, the present invention provides a support shaft that protrudes outward on the peripheral wall portion of the ladle, and provides a suspension arm on the support shaft so that the arm is arranged around the axis of the support shaft. Rotating means is provided between the arm and the support shaft. The rotating means includes an operation shaft and an annular handle provided on the operation shaft, and rotates the handle. Is used for a hanging ladle device having a function of rotating the operating shaft around the axis of the support shaft by rotation of the operating shaft, and abutting on the outer periphery or inner periphery of the handle A function of transmitting rotation to the handle by rotating the drive roller with a driving force while maintaining a state in which the outer periphery of the handle is in contact with the outer periphery or inner periphery of the handle. The hanging ladle device And adopts ladle handle rotating device provided separately.

In this way, the handle can be rotated by the driving force regardless of human power, so that the arm can be easily rotated in a short time.
Further, since the drive roller is brought into contact with the handle to transmit the rotation, the drive means can be separated from the hanging ladle device and can be a so-called “external type”. If the handle rotation device is “externally attached”, it is not necessary to provide a driving means for rotating the arm integrally for each ladle device, and if the handle rotation device acts on the ladle device only when necessary. Good. For this reason, the cost of the apparatus can be reduced.

  The ladle handle rotating device may be stationary or portable. Further, in either case of stationary type or portable type, for example, according to the position where the suspension type ladle device that is movable by a conveying roller or the like is stopped, the driving roller comes into contact with the handle, It is convenient to be able to adjust the height and horizontal position of the drive roller.

  Further, it is possible to adopt a configuration in which the outer periphery of the drive roller is a rubber layer. If the outer periphery of the driving roller is a rubber layer, the frictional force between the driving roller and the handle is increased, so that the rotation transmission loss is reduced.

  The handle is provided on a holding member that rotates integrally with the arm about the axis of the support shaft. When the arm rotates, the center of rotation of the handle moves about the axis of the support shaft. The driving roller is provided with pressing means, and when the arm rotates and the driving roller and the handle move relative to each other, the pressing means always presses the outer peripheral surface of the driving roller to a certain level. It is possible to adopt a configuration in which a state in which the handle is brought into contact with the outer periphery or the inner periphery of the handle is maintained.

  If the center of rotation of the arm (axis of the support shaft) and the center of rotation of the handle (axis of the operating shaft) match, the center of rotation of the handle does not move when the arm rotates with respect to the ladle. It is. However, when both rotation centers are not in a straight line, the rotation center of the handle moves when the arm rotates with respect to the ladle. That is, if the position of the driving roller is not moved, the driving roller and the handle relatively move with the rotation of the arm, and the driving roller is separated from the handle. For this reason, a constant pressing force cannot be maintained.

  For this reason, the outer peripheral surface of the drive roller is always kept in contact with the outer periphery or the inner periphery of the handle with a constant pressing force by the pressing means. That is, the pressing means moves the position of the driving roller so that the driving roller always contacts the handle with a constant pressing force in accordance with the movement of the handle accompanying the rotation of the arm. It has the function of making it possible to maintain its pressing force on the handle.

  As the structure of the rotation means, a known transmission mechanism having a function of converting the rotation of the handle and the operation shaft into the rotation of the arm with respect to the support shaft of the ladle can be adopted. For example, a known transmission mechanism such as a gear mechanism or a link mechanism can be employed.

The ladle handle rotating device of the present invention can also be employed in the configuration in which the axial direction of the support shaft and the axial direction of the operating shaft are parallel to each other as the configuration of the rotating means.
The configuration in which the axial direction of the support shaft and the axial direction of the operation shaft are parallel is, for example, that the worm shaft is rotatably provided on the holding member, and the worm of the worm shaft rotates with the support shaft. Examples include a configuration in which the operation shaft is provided in parallel with the support shaft, and the rotation of the operation shaft is transmitted to the worm shaft. If the worm mechanism is used, there is an advantage that the heavy arm can be rotated with a relatively weak force for turning the handle.

  As described above, if the axial direction of the support shaft and the axial direction of the operation shaft are parallel, the handle that moves as the arm rotates is within the same plane orthogonal to the axial direction of the support shaft, or within the same plane. Since the locus is drawn in a portion close to, the drive roller following the locus can be handled by control in one axial direction within the same plane. For this reason, the structure of an apparatus can be simplified.

Moreover, an air cylinder can be adopted as the pressing means. If the pressing means is an air cylinder, the driving roller can be maintained at a constant pressing force with respect to the handle if it is set to maintain a constant pressure in the cylinder chamber.
In addition, air is a compressible fluid, unlike oil pressure, and therefore has a cushioning effect, and can easily cope with a sudden relative position change between the drive roller and the handle.

  According to the present invention, the arm can be easily rotated in a short time, and a lower cost apparatus can be obtained.

  Embodiments of the present invention will be described with reference to the drawings. The ladle handle rotating device of this embodiment is used for rotating the arm 3 attached to the ladle 1 of the hanging ladle device 9 in the molten metal processing line 40 of the foundry. .

  First, the structure of the hanging ladle device 9 will be described. The structure of the hanging ladle device 9 is the same as that of the conventional example, and as shown in FIGS. 2 and 3, the ladle 1 that can accommodate the molten metal is placed below both ends of the spanning portion 3b that extends in the horizontal direction. A gate-shaped arm 3 provided with extending leg portions 3a, 3a is attached. The span 3b includes a hook 2 for hanging at the center.

  The ladle 1 is formed in a concave shape having a cylindrical peripheral wall portion 4 and a bottom portion 5, and a molten metal can be put into the inside from an upper opening. Moreover, since the heat insulating material 6 is provided along the inner surface of the ladle 1, the temperature fall of the molten metal accommodated in the inside can be prevented.

A support shaft 7 protruding outward is provided on the peripheral wall portion 4 of the ladle. The support shafts 7 are joined to both sides of the ladle 1 with respect to the cylinder shaft, and the shaft centers of both support shafts 7 and 7 are concentric.
At the lower end portions of both the leg portions 3a, 3a of the arm 3, holding portions 3c each having an insertion hole 3d through which the support shaft 7 can be inserted are provided. The support shafts 7 and 7 are inserted into the insertion holes 3d and 3d of the holding portions 3c and 3c, and the arm 3 is supported by the ladle 1 so as to be rotatable about the support shafts 7 and 7. Yes.

  Further, a rotating means 10 is attached between the holding portion 3 c of the arm 3 and one support shaft 7 joined to the ladle 1.

The structure of the rotation means 10 is the same as that of the conventional example, and the rotation means 10 includes an operation shaft 13 and an annular handle 16 provided on the operation shaft 13. The axis of the operation shaft 13 is the center of rotation of the handle 16. By rotating the handle 16, the operation shaft 13 rotates about the axis, and the rotation of the operation shaft 13 rotates the arm 3 about the axis of the support shaft 7. When the arm 3 rotates in the direction of arrow A shown in FIG. 1A, the handle 16 moves around the axis of the support shaft 7 as shown by arrow B. Further, by rotating the handle 16 in the reverse direction, the fallen arm 3 rotates in the direction opposite to the arrow A and returns to the original standing state.
Since the configuration of the worm mechanism, the bevel gear, and the like that transmit the rotation of the operation shaft 13 as a movement of the arm 3 rotating around the axis of the support shaft 7 is the same as the conventional example shown in FIG. Illustration and description are omitted.

  Next, the configuration of the melt treatment line 40 will be described. As shown in FIG. 5, the molten metal treatment line 40 is provided with an addition device 41 for performing a graphite spheroidizing treatment on the molten cast iron supplied into the ladle 1 of the ladle device 9.

  The movement of the ladle device 9 in the line 40 will be described. The ladle device 9 (with molten metal) suspended by a crane is placed on the pallet 52 of the crane conveyance place 50 as shown by an arrow a in FIG. Will be withdrawn. FIG. 4B shows a state where the ladle device 9 is suspended by a crane.

  The line 40 is provided with a number of rollers 51 that are rotated by a driving force. When the ladle device 9 reaches a predetermined position on the line 40, the rotation of the ladle 51 is stopped. As the roller 51 rotates, the ladle device 9 moves toward the adding device 41 as indicated by an arrow b, and stops immediately below the adding device 41.

  In the addition device 41, as shown in FIG. 4A, a lid 42 removed from above is attached so as to close the upper opening of the ladle 1. The cored wire w drawn from the coil 53 (see FIG. 5) is inserted into the inside from the through hole 43 provided in the lid 42, and the metal of the cored wire w is melted into the molten metal to perform the graphite spheroidization treatment.

  After the spheroidizing process is performed on the molten metal, the lid 42 is removed, and the ladle device 9 moves toward the crane conveyance place 50 as indicated by an arrow c, and the ladle apparatus 9 moves to the crane conveyance place 50. When the upper predetermined position is reached, the rotation of the roller 51 stops and the ladle device 9 stops.

  The ladle device 9 on the crane conveyance place 50 is lifted by a crane as shown in FIG. 4B, and is carried out to the next step as indicated by an arrow d shown in FIG.

  Next, the configuration of the handle rotation device 20 will be described. In this line 40, when the ladle device 9 is carried into the crane conveyance place 50 by a crane, the arm 3 of the ladle device 9 is in a state of rising upward as shown in FIG. 4B. A horizontal span 3 b of the arm 3 is located immediately above the opening of the ladle 1.

As described above, when the arm 3 is in a standing state, the arm 3 is disturbed when the lid 42 is attached to and detached from the adding device 41. For this reason, in the addition apparatus 41, it is necessary to incline the arm 3 with respect to the ladle 1 as shown to Fig.4 (a).
In addition, after the arm 3 is tilted by the adding device 41, when the ladle device 9 is carried out to the next process at the crane transport site 50, the arm 3 needs to be raised.
Therefore, a ladle handle rotating device 20 is provided in the crane conveyance place 50.

  The handle rotation device 20 is provided separately from the ladle device 9 and is a stationary type fixed on the floor surface. Further, as shown in FIGS. 2A and 2B, a drive roller 21 capable of contacting the outer periphery 16a of the handle 16 is provided.

  When the ladle device 9 on the line 40 approaches the handle rotating device 20, the ladle device 9 stops at a position where the handle 16 is located immediately above the drive roller 21.

  The drive roller 21 is attached to a pedestal 23 provided on a guide 22 extending in the vertical direction so as to be movable up and down. Under the pedestal 23, a pressing means 30 comprising an air cylinder is provided.

  In a state where the ladle device 9 is stopped, the driving roller 21 is pushed up from the position indicated by the chain line to the position indicated by the solid line in FIG. Comes into contact with the outer periphery 16 a of the handle 16. The pressing means 30 is set so that the outer peripheral surface 21a of the driving roller 21 and the outer peripheral surface 16a of the handle 16 can be maintained at a predetermined pressing force.

  In this way, the driving roller 21 is rotated by the driving force of the motor M while maintaining the state where the outer peripheral surface 21 a of the driving roller 21 is in contact with the outer peripheral surface 16 a of the handle 16. As shown in FIG. 1A, when the driving roller 21 rotates in the direction of arrow n, the rotation is transmitted to the handle 16 due to friction of the contact portion between the driving roller 21 and the handle 16, and the handle 16 is Rotate in the direction of arrow o. At this time, since the rubber layer 24 is provided on the outer periphery 21a of the drive roller 21, the frictional force of the contact portion is increased and the rotation transmission loss is reduced (see FIG. 1C).

  When the handle 16 rotates in the direction of arrow o, the rotation center of the handle 16 rotates in the direction of arrow B shown in FIG. This is because, as described above, the operation shaft 13 that rotates integrally with the handle 16 is attached to the holding member 12 that rotates about the axis of the support shaft 7 together with the arm 3.

When the rotation center of the handle 16 rotates in the direction of arrow B, the relative positional relationship between the drive roller 21 and the handle 16 changes. That is, the handle 16 moves from the position indicated by the solid line in FIG. 1B to the position indicated by the chain line.
At this time, the pressing means 30 gradually pushes up the driving roller 21 from the position indicated by the solid line in the drawing to the position indicated by the chain line in accordance with the movement of the handle 16 to handle the outer peripheral surface 21a of the driving roller 21. The pressing force with respect to the outer periphery 16a of 16 is always kept constant.

  Thus, since a constant pressing force is always maintained, even if the driving roller 21 and the handle 16 move relative to each other as the arm 3 rotates, the rotation from the driving roller 21 to the handle 16 is continued. Is continued until the arm 3 is completely collapsed, as indicated by a chain line in FIG.

  At this time, the operation shaft 13 is provided in parallel with the support shaft 7, and the contact portion with the drive roller 21 on the outer periphery 16 a of the handle 16 is always the same as orthogonal to the operation shaft 13. It is located in the plane or near the same plane.

  For this reason, even if the rotation center of the handle 16 moves around the axis of the support shaft 7, the contact portion with the drive roller 21 on the outer periphery 16 a of the handle 16 is the same perpendicular to the axial direction of the support shaft 7. Draw a trajectory in the plane or near the same plane. For this reason, the drive roller 21 only needs to follow the locus of the outer periphery 16a that moves along the same surface, so that it can be handled only by the vertical control by the air cylinder. That is, it is not necessary to move the driving roller 21 along the axial direction of the support shaft 7 or to move in the horizontal direction perpendicular to the axial direction of the support shaft 7. For this reason, the structure of the pressing means 30 of the handle rotating device 20 can be dealt with by control of only one axis for moving the driving roller 21 in the vertical direction, and the structure of the device can be simplified.

  A slight error may occur in the stop position of the ladle device 9. For example, the ladle device 9 moves in the direction indicated by the arrow q in FIG. 3B (the axial direction of the support shaft 7) with respect to the stationary handle rotating device 20, and approaches the handle rotating device 20. As an example, since the driving roller 21 has a width L in the direction of the rotation axis, the relative position between the ladle device 9 and the driving roller 21 is the left-right direction (supporting in the figure). Even if it is slightly deviated in the axial direction of the shaft 7, rotation can be transmitted to the handle 16 without fine adjustment of the position.

Further, even if the handle 16 is distorted or the operation shaft 13 that supports the handle 16 is swayed, if the sway or sway is within the range of the width L of the drive roller 21, it is rotated. Communication is possible.
Of course, the handle rotating device 20 may be provided with a function of adjusting the position of the driving roller 21. In other words, the drive roller 21 is moved along the axial direction of the support shaft 7 in accordance with the position of the handle 16 or has a function of moving in the horizontal direction perpendicular to the axial direction of the support shaft 7. good.

In the above embodiment, the ladle device 9 is configured to move along the axial direction of the support shaft 7 for the arm 3. It is good also as a direction orthogonal to an axial direction.
In addition, the positional relationship and arrangement direction between the handle rotation device 20 and the ladle device 9 can be freely set as long as the movement of the ladle device 9 on the line 40 is not hindered.

  Further, it is possible to adopt a configuration in which rotation is transmitted by bringing the outer peripheral surface 21 a of the drive roller 21 into contact with the inner periphery 16 b of the handle 16.

  When the rotation means 10 is used in which the axis of the support shaft 7 supporting the arm 3 and the axis of the operation shaft 13 positioned at the rotation center of the handle 16 are concentric, it is driven by the rotation of the arm 3. Since relative movement between the roller 21 and the handle 16 does not occur, a configuration in which the expansion / contraction stroke of the air cylinder as the pressing means 30 is shortened can be employed.

Further, in this embodiment, the handle rotation device 20 is arranged only in the crane conveyance place in the line 40. However, when the loading and unloading by the crane are different places, the handle is provided in both the carrying-in place and the carrying-out place. A configuration in which the rotating device 20 is arranged may be employed.
In addition, the ladle handle rotating device 20 of the present invention is not limited to the line 40 shown in the above embodiment, and can also be adopted in a line for handling molten metal having another configuration.

An embodiment is shown, (a) is a front view of a ladle device for hanging and a handle rotating device, (b) is an enlarged view of the main part of (a), (c) is an enlarged view of the main part of (b). The arm of the same embodiment is shown standing up, (a) is a front view, (b) is a side view. The arm of the embodiment is shown in a collapsed state, (a) is a front view, (b) is a side view. (A) is a front view which shows the state which attached the lid to the ladle in the molten metal process, (b) is a front view which shows the state suspended with the crane. Overall view showing line configuration The structure of a hanging ladle device is shown, (a) is a front view, and (b) is an enlarged plan view of the main part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladle 2 Hook 3 Arm 3a Leg part 3b Hanging part 3c Holding part 4 Peripheral wall part 5 Bottom part 6 Heat insulating material 7 Support shaft 9 Hanging type ladle apparatus (ladder apparatus)
DESCRIPTION OF SYMBOLS 10 Rotating means 11 Mounting plate 12 Holding member 13 Operation shaft 14, 15 Bevel gear 16 Handle 16a Outer periphery 16b Inner periphery 17 Worm wheel 18 Worm shaft 19 Worm 20 Handle rotation device 21 Drive roller 21a Outer surface 22 Guide 23 Base 24 Rubber Layer 30 Pressing means 40 Line 41 Addition device 42 Lid 43 Through-hole 50 Crane conveyance place 51 Roller 52 Pallet 53 Coil w Cored wire

Claims (5)

A support shaft 7 projecting outward is provided on the peripheral wall portion 4 of the ladle 1, and a suspension arm 3 is provided on the support shaft 7 so that the arm 3 can be rotated around the support shaft 7. A rotation means 10 is provided between the arm 3 and the support shaft 7, and the rotation means 10 includes an operation shaft 13 and an annular handle 16 provided on the operation shaft 13, and rotates the handle 16. The operating shaft 13 is rotated by rotating the operating shaft 13, and the arm 3 is used for the hanging ladle device 9 having a function of rotating around the axis of the support shaft 7,
A drive roller 21 is provided that can contact the outer periphery 16a or the inner periphery 16b of the handle 16, and the outer peripheral surface 21a of the drive roller 21 is maintained in contact with the outer periphery 16a or the inner periphery 16b of the handle 16. A ladle handle rotating device provided with a function of transmitting rotation to the handle 16 by rotating the driving roller 21 with a driving force and provided separately from the hanging ladle device 9.   The ladle handle rotating device according to claim 1, wherein a rubber layer is provided on an outer periphery of the driving roller. The handle 16 is provided on a holding member 12 that rotates integrally with the arm 3 around the axis of the support shaft 7. When the arm 3 rotates, the center of rotation of the handle 16 is the axis of the support shaft 7. Move around,
The driving roller 21 is provided with pressing means 30, and when the arm 3 rotates and the driving roller 21 and the handle 16 move relative to each other, the pressing means 30 causes the outer peripheral surface 21 a of the driving roller 21 to move. The ladle handle rotation device according to claim 1 or 2, wherein a state in which the handle is always brought into contact with the outer periphery 16a or the inner periphery 16b of the handle 16 with a constant pressing force is maintained.   The ladle handle rotating device according to claim 3, wherein the operation shaft (13) is provided in parallel with the support shaft (7).   The ladle handle rotating device according to claim 3 or 4, wherein the pressing means (30) is an air cylinder.

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