JPH0679443A - Device for casting molten metal - Google Patents

Abstract

PURPOSE:To lighten the operating force of a handle without using a large diameter gear by preventing the deformation, making engaging of gears good and reducing the friction at the engaging part of the gears. CONSTITUTION:This casting device for molten metal is provided with inclining mechanism 7 for inclining a ladle through a hinging shaft 1a. In the inclining mechanism 7, a first helical gear 71 integratedly rotated with the hinging shaft 1a is driven with the handle via a second helical gear 72 and a worm screw 73. Supporting shafts 72a, 73a of the second helical gear 72 and the worm screw 73 are supported at both ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hanging type molten metal pouring device.

[0002]

2. Description of the Related Art Conventionally, as a suspension type molten metal casting device, an insertion hole for inserting a pivot shaft connected to both sides of a ladle into the lower end of a pair of suspension arms that can be suspended. In addition to providing a holding part formed with the above, the suspension arm and the holding part are integrally joined by a reinforcing plate, and a ladle is fixed to one of the reinforcing plates via a pivot shaft. There is provided a device having a tilting mechanism for rotating the arm relative to the suspension arm (for example, Japanese Patent Laid-Open No. 2-17935).
No. 2).

The tilting mechanism includes a worm wheel integrally rotatably attached to the end of the pivot shaft, a worm screw meshing with the worm wheel, and a handle for turning the worm screw via a bevel gear mechanism or the like. Has become.

[0004]

By the way, in order to place a candy (a device for pushing alloy irons) for treating molten metal (FCD or the like) on a ladle (or for lining the inner surface of the ladle). ), The tilting arm is usually tilted with the ladle on the floor. However,
The weight of the ladle can be as small as about 200 kg or as heavy as more than 100,000 kg. The suspension arm that supports such a heavy ladle needs to be robust, and the small as large as 20 kg. Has a weight of about 6000 Kg. Therefore, even if the moment for rotating such a heavy suspension arm is 10
It is very large, from 00 kg · cm to 600,000 kg · cm. Therefore, there is a problem that the operating force of the handle of the tilting mechanism for tilting the suspension arm is so heavy that the operator has to apply the entire weight, and the workability is poor. In particular, the pushing load from the worm wheel was received by the single support shaft that supported the worm screw, so the deformation of the support shaft causes the meshing of the worm wheel and the worm screw to deteriorate, and the frictional force at the meshing portion is reduced. Was increasing, and the steering wheel operating force was heavy.

Although there is a type in which the tilting mechanism is driven by an electric motor instead of the handle, there is a problem that the driving torque becomes large as in the case of the handle.
This invention has been made in view of the above problems,
It is an object of the present invention to provide a molten metal casting device capable of tilting a suspension arm with a light operating force while a ladle is placed on the floor.

[0006]

In order to achieve the above object, a molten metal pouring device of the present invention is a pivotal support joined to both sides of a ladle at the lower ends of a pair of suspending hanging arms. While providing a holding portion formed with an insertion hole for inserting the shaft, the suspension arm and the holding portion are integrally joined and formed by a reinforcing plate, and on the mounting plate fixed to one reinforcing plate, A molten metal pouring device equipped with a tilting mechanism for rotating a ladle relative to a suspension arm via a pivot, wherein the tilting mechanism is attached to the pivot to rotate integrally. A first helical gear, a second helical gear arranged above the first helical gear and meshing with the first helical gear, and a second helical gear above the second helical gear. Is engaged with the second helical gear and is driven by the drive mechanism. And a Omu screws, second
Each of the support shafts of the helical gear and the worm screw is characterized in that it is supported by both ends by a support portion provided upright on the mounting plate.

[0007]

According to the molten metal pouring device having the above structure, when the worm screw is driven by the drive mechanism, this rotation is transmitted to the pivot shaft via the second helical gear and the first helical gear. Therefore, the ladle can be tilted relative to the suspension arm. Moreover, since the support shafts of the second helical gear and the worm screw are both-supported and supported by the support portions which are erected on the mounting plate, the pushing load from the first helical gear is It can be received by two helical gears and two support shafts of a worm screw. As a result, it is possible to prevent deformation of each part, and it is possible to prevent an increase in friction of the meshing part between the second helical gear and the worm screw due to the deformation. Therefore,
It is possible to reduce the operating force of the drive mechanism for tilting the hanging arm when tilting the hanging arm with the ladle placed on the floor, such as when attaching a candy to the top of the ladle.

[0008]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 3 is a schematic front view showing the molten metal pouring apparatus of the present invention, and FIG. 4 is a schematic side view thereof. With reference to these figures, this casting device is a ladle 1 and a ladle 1
A pair of suspension arms 3a, 3b capable of suspending the arm, and insertions for inserting the pivotal shafts 1a, 1b provided at the lower ends of the suspension arms 3a, 3b and joined to both sides of the ladle 1. Holding portions 2a, 2b having holes 22a, 22b, a pair of reinforcing plates 4a, 4b integrally formed by welding the suspension arms 3a, 3b with the holding portions 2a, 2b, and one reinforcing plate 4a. The mounting plate 5 fixed to the
And a tilting mechanism 7 for rotating the ladle 1 relative to the suspension arms 3a and 3b via a pivot shaft 1a by a handle 75.

In the figure, 8 is a connecting member for the suspension arms 3a and 3b, 11 is an engaging portion such as a hook for carrying the ladle 1 to an appropriate position by a crane or the like, and 10 is a pouring of molten metal. Showing mouth. When the ladle 1 is in use, the ladle 1 containing the molten metal is transported to an appropriate position while the hook of the crane or the like is engaged with the engaging portion 11, and the handle 75 is rotated.
Tilt the ladle 1 and pour the molten metal into the mold. On the other hand, ladle 1
For example, when placing the candy on the table, the handle 75 is rotated with the ladle 1 placed on the floor to tilt the suspension arms 3a and 3b, and after removing the candy,
The handle 75 is rotated again to return the suspension arms 3a and 3b to the original vertical state.

The reinforcing plates 4a and 4b are designed to withstand the weight of the ladle 1 when suspended and to integrate the holding parts 2a and 2b so as not to come off the suspending arms 3a and 3b. (See FIG. 5). Referring to FIG. 1 and FIG.
The tilting mechanism 7 includes a first helical gear 71 attached to the pivot shaft 3 so as to be integrally rotatable, and a first helical gear 71 arranged above the first helical gear 71. A second helical gear 72 that meshes with, a worm screw 73 that is arranged above the second helical gear 72 and that meshes with the second helical gear 72, and a known worm screw 73 that rotates the worm screw 73. The bevel gear mechanism 74 and the handle 75 for rotating the bevel gear mechanism 74 are provided.

The support shaft 72a of the second helical gear 72 is
Support part 9 made of a pillow block erected on the mounting plate 5
Both sides are supported by a, and the support shaft 73a of the worm screw 73 is supported by both sides by a support portion 9b made of a pillow block which is also erected on the mounting plate 5. These supporting portions 9a and 9b are joined to each other, and the supporting portion 9c formed of a pillow block supporting the bevel gear mechanism 74 and the handle shaft is integrated therewith, and the tilting mechanism 7 is placed on the mounting plate as a whole. The holding frame 9 for holding on the 5 is comprised. S45C or the like was used as the material for both the helical gear 71 and the worm screw 73, and phosphor bronze casting was used as the material for the helical gear 72 that meshes with both of them to reduce the friction coefficient. According to this embodiment, when a candy for pushing ferrous alloys is attached to the upper portion of the ladle 1, when the worm screw 73 is driven by the handle 75 with the ladle 1 placed on the floor, The rotation is transmitted to the pivot shaft 3 via the second helical gear 72 and the first helical gear 71, and the suspension arm 2
Can be tilted. At this time, the support shafts 72a, 73 of the second helical gear 72 and the worm screw 73
Since a is supported on both sides by the support portions 9a and 9b provided upright on the mounting plate 6, the pushing-up load from the first helical gear 71 is received by the two support shafts 72a and 73a. be able to. As a result, it is possible to prevent the deformation of each part and prevent an increase in the friction of the meshing part between the second helical gear 72 and the worm screw 73, and to operate the suspension arm 2 with a light operating force. It can be tilted with respect to the ladle 1.

Furthermore, since only the helical gear 72 is made of phosphor bronze casting and the others are S45C, the friction coefficient of the meshing portion can be reduced, and the operating force can be further reduced. Further, with the above structure, the operating force can be sufficiently reduced, so that it is not necessary to increase the diameter of the gear in order to increase the reduction ratio. In other words, in the conventional combination of a worm screw and a worm wheel, even if the diameter of the worm wheel is increased to increase the reduction ratio, the worm wheel cannot be large enough to get in the way when it is placed on the floor. In addition to the above, there is a problem in that it becomes heavy in weight, but this is not the case in the present embodiment. Tilt Test of Suspending Arm with Ladle Placed Instead of the handle 75 of the embodiment of FIG. 1, a casting device of a test example was prepared in which a motor (rated power 0.75 KW, rated current 3.3 A) was attached. On the other hand, a casting apparatus of a comparative example having a configuration in which the second helical gear 72 was omitted from the casting apparatus of this test example was created. Then, with the ladle 1 (about 4 tons) of these test examples and comparative examples placed on the floor surface, the suspension arms 3a and 3b were moved vertically from the vertical direction as shown in FIG.
The drive torque of the motor when tilted to 0 ° and returned to vertical was compared and measured by the current value flowing through the motor.

As a result, as shown in FIG. 7, it was 2A to 6A in the comparative example, while it was 1.5A in the test example.
It was a very low value of ~ 1.8. As a result, the operating force of the test example was 1/3 or less as compared with the conventional one, and it was proved that the operating force was light. Tilt of the ladle while the ladle is suspended by the hanging arm
Test In comparison with the same test example and comparative example as described above, the ladle 1 at the time of suspension was tilted 90 ° from the vertical and returned to the vertical again, and the current value of the motor at this time was measured. It is 2.5 A (constant), whereas it is 1.5 A in the test example.
It was A (constant), and the operating force was found to be about 60%. As a result, it was proved that the operation force for tilting the ladle when hanging was also light.

The present invention is not limited to the above-described embodiment, and for example, the pivot shaft 3 is supported on both sides of the first helical gear 71, so that the deformation can be prevented. It is possible to prevent this and further reduce the operation force. In addition, tilting the ladle 1 with a motor, etc.
Various design changes can be made without changing the gist of the present invention.

[0015]

As described above, according to the molten metal casting apparatus of the present invention, the pushing load from the first helical gear is supported by the two helical gears and the worm screw. By receiving on the shaft, it is possible to prevent deformation of each part,
As a result, the engagement between the second helical gear and the worm screw is improved, and it is possible to prevent an increase in friction at the engagement portion. Therefore, especially when tilting the hanging arm with the ladle on the floor, such as when installing a canister on the top of the ladle, the operating force of the drive mechanism for tilting the hanging arm is greatly reduced. can do.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a tilting mechanism of a molten metal pouring device according to an embodiment of the present invention.

FIG. 2 is a schematic front view thereof.

FIG. 3 is a schematic front view of a casting device.

FIG. 4 is a schematic side view thereof.

FIG. 5 is a perspective view of a portion that receives a pivot shaft.

FIG. 6 is an explanatory diagram showing a tilt test.

FIG. 7 is a diagram showing a change in current.

[Explanation of symbols]

 1 Ladle 1a, 2a Pivot shaft 3a, 3b Hanging arm 4a, 4b Reinforcing plate 5 Mounting plate 7 Tilt mechanism 71 First helical gear 72 Second helical gear 73 Worm screw 72a, 73a Support Shafts 9a, 9b Supports

Claims (1)

[Claims] Claims: 1. A pair of suspending arms that can be suspended are provided at the lower ends thereof with holding portions having insertion holes through which pivot shafts joined to both sides of a ladle are inserted, and a suspending arm and The holding part is integrally formed with the reinforcing plate, and the mounting plate fixed to one reinforcing plate tilts the ladle relative to the suspension arm via the pivot shaft. A molten metal pouring device having a mechanism, wherein the tilting mechanism is arranged above a first helical gear integrally rotatably attached to a pivot shaft and above the first helical gear. A second helical gear that meshes with the first helical gear, and a second helical gear that is disposed above the second helical gear and meshes with the second helical gear, and is driven by a drive mechanism. With a worm screw, and the support shaft of the second helical gear and the worm screw is Casting apparatus of the molten metal, characterized in that it is supported at both ends by a support portion erected on the mounting plate.