JP3083208B2 - Molten casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension type casting apparatus for molten metal.

[0002]

2. Description of the Related Art Conventionally, as a casting apparatus for casting a molten metal of a hanging type, an insertion hole for inserting a pivot shaft joined to both sides of a ladle into the lower ends of a pair of hanging arms that can be hung. Is provided, and the suspension arm and the holding portion are integrally joined with a reinforcing plate, and a ladle is mounted on a mounting plate fixed to one of the reinforcing plates via a pivot shaft. Provided with a tilting mechanism for rotating the arm relative to the suspension arm (for example, Japanese Patent Application Laid-Open No. Hei 2-17935).
No. 2).

The tilting mechanism includes a worm wheel attached to the end of the pivot shaft so as to be integrally rotatable, 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 in ferro-alloys) for processing (FCD or the like) the molten metal on the ladle (or to perform a lining process on the inner surface of the ladle). ), Usually, the hanging arm is tilted with the ladle placed on the floor. However,
The weight of the ladle can be as small as about 200 kg to as heavy as over 100,000 kg, and the suspension arm that supports such a heavy ladle also needs to be robust. Has a weight of about 6000 kg. Therefore, even if the moment for rotating such a heavy suspension arm is 10
It is as large as 00 Kg · cm to 600,000 Kg · cm. For this reason, the operating force of the handle of the tilting mechanism for tilting the suspension arm is so heavy that the operator must apply the entire weight, and the workability is poor. In particular, since a single support shaft supporting the worm screw receives the pushing load from the worm wheel, the meshing between the worm wheel and the worm screw becomes poor due to deformation of the support shaft and the frictional force of the meshing portion. And the steering wheel operating force was increased.

Although there is a type in which the tilting mechanism is driven by an electric motor instead of a handle, there is a problem that the driving torque is increased as in the case of the handle.
The present invention has been made in view of the above problems,
It is an object of the present invention to provide a casting apparatus for molten metal in which a hanging arm can be tilted with a small operating force while a ladle is placed on a floor.

[0006]

In order to achieve the above object, the present invention provides a casting apparatus for molten metal, in which a lower end of a pair of suspending arms which can be suspended is pivotally connected to both sides of a ladle. A holding portion having an insertion hole for inserting the shaft is provided, and the suspension arm and the holding portion are integrally formed with a reinforcing plate, and the mounting plate fixed to one of the reinforcing plates is A casting apparatus for molten metal to which a tilting mechanism for rotating a ladle relative to a suspension arm via a pivot shaft is attached, wherein the tilting mechanism is rotatably attached to the pivot shaft. A first helical gear, a second helical gear disposed above and meshing with the first helical gear, and above the second helical gear; And is engaged with the second helical gear, and is driven by the driving mechanism. And a Omu screws, second
Each of the support shafts of the helical gear and the worm screw is supported at both ends by a support portion erected on the mounting plate.

[0007]

According to the molten metal pouring apparatus having the above-described 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. The ladle can be tilted relatively to the suspension arm. In addition, since the respective support shafts of the second helical gear and the worm screw are supported at both ends by the support portions erected on the mounting plate, the pushing load from the first helical gear is reduced by the above-mentioned first helical gear. Two helical gears and a worm screw can be received by two support shafts. Thereby, deformation of each part can be prevented, and increase in friction of the meshing portion between the second helical gear and the worm screw due to the deformation can be prevented. Therefore,
When tilting the suspension arm with the ladle placed on the floor, for example, when attaching a candy to the upper part of the ladle, the operating force of the drive mechanism for tilting the suspension arm can be reduced.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 3 is a schematic front view showing an apparatus for casting molten metal of the present invention, and FIG. 4 is a schematic side view thereof. Referring to these figures, the casting apparatus includes a ladle 1 and a ladle 1.
And a pair of suspension arms 3a and 3b capable of suspending the ladder 1 and the pivot shafts 1a and 1b provided at the lower ends of the suspension arms 3a and 3b and joined to both sides of the ladle 1. Holding portions 2a and 2b having holes 22a and 22b formed thereon, a pair of reinforcing plates 4a and 4b in which suspension arms 3a and 3b and holding portions 2a and 2b are integrally formed by welding or the like, 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 by the handle 75 via the pivot shaft 1a.

In the drawings, reference numeral 8 denotes a connecting member for the suspension arms 3a and 3b, 11 denotes an engaging portion such as a hook for transferring the ladle 1 to an appropriate position by a crane or the like, and 10 denotes pouring of molten metal. Showing mouth. When the ladle 1 is in use, the ladle 1 containing the molten metal is conveyed to an appropriate position in a state where a hook such as a crane is engaged with the engaging portion 11, and the handle 75 is rotated.
Ladle 1 is tilted and the molten metal is poured into the mold. On the other hand, ladle 1
For example, when the candy is placed on the floor, the handle 75 is rotated while the ladle 1 is placed on the floor, the suspension arms 3a and 3b are tilted, and after the candy is removed,
By turning the handle 75 again, the suspension arms 3a and 3b are returned to the original vertical state.

The reinforcing plates 4a and 4b are used to sufficiently withstand the weight of the ladle 1 when suspended, and to integrate them so that the holding portions 2a and 2b do not come off the suspension arms 3a and 3b. (See FIG. 5). Referring to FIGS. 1 and 2,
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 disposed above the first helical gear 71. A second helical gear 72 meshing with the second helical gear 72, a worm screw 73 disposed above the second helical gear 72 and meshing with the second helical gear 72, and a known worm screw 73 for rotating the worm screw 73. And a handle 75 for rotating the bevel gear mechanism 74.

The support shaft 72a of the second helical gear 72 is
Support section 9 composed of a pillow block erected on mounting plate 5
The support shaft 73a of the worm screw 73 is also supported at both ends by a support portion 9b formed of a pillow block erected on the mounting plate 5. These support portions 9a and 9b are joined to each other, and further integrated with a bevel gear mechanism 74 and a support portion 9c composed of a pillow block supporting a handle shaft. As a whole, the tilting mechanism 7 is mounted on the mounting plate. 5 constitutes a holding frame 9 for holding the frame. S45C or the like was used as a material of both the helical gear 71 and the worm screw 73, and a phosphor bronze casting was used as a material of the helical gear 72 meshing with both of them to reduce the friction coefficient. According to this embodiment, when the ladder 1 is placed on the floor and the worm screw 73 is driven by the handle 75 in a case where a candy for pushing the ferrous alloy is mounted on the upper part of the ladle 1, for example, 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 and 73 of the second helical gear 72 and the worm screw 73
a is supported on both sides by the supporting portions 9a and 9b erected on the mounting plate 6, so that the pushing load from the first helical gear 71 is received by the two support shafts 72a and 73a. be able to. Thereby, the deformation of each part can be prevented, and the increase in the friction of the meshing portion between the second helical gear 72 and the worm screw 73 can be prevented, and the suspension arm 2 can be moved with a light operating force. The ladle 1 can be tilted.

Further, since only the helical gear 72 is made of a phosphor bronze casting and the other is made of S45C, the friction coefficient of the meshing portion can be reduced, and the operating force can be further reduced. In addition, with the above-described 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 combination of the conventional worm screw and worm wheel, even if the diameter of the worm wheel is increased in order to increase the reduction ratio, the worm wheel cannot be large enough to disturb the ladle on the floor. In addition to this, there is also a problem that the weight becomes heavy, but in the present embodiment, such a problem does not occur. Tilt test of hanging arm with ladle placed 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 instead of the handle 75 in the embodiment of FIG. On the other hand, a casting device of a comparative example having a configuration in which the second helical gear 72 was omitted from the casting device of this test example was prepared. Then, with the ladles 1 (about 4 ton) of these test examples and comparative examples placed on the floor, the hanging arms 3a and 3b are moved 45 degrees from the vertical as shown in FIG.
° and the drive torque of the motor when returning to vertical again was compared and measured by the current value flowing through the motor.

As a result, as shown in FIG. 7, in the comparative example, it was 2A to 6A, whereas in the test example, it was 1.5A.
１1.8 markedly low value. Thereby, the operating force of the test example was 1/3 or less as compared with the conventional example, and it was proved that the operating force was light. Tilt of the ladle with the ladle suspended by the suspension arm
Test For the test example and the comparative example similar to the 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. 2.5 A (constant), whereas in the test example 1.5 A
A (constant), indicating that the operating force was about 60%. This proved that the operating force for tilting the ladle during suspension was also light.

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

[0015]

As described above, according to the apparatus for casting molten metal of the present invention, the load lifted from the first helical gear can be supported by the two supports of the second helical gear and the worm screw. By receiving on the shaft, deformation of each part can be prevented,
As a result, the meshing between the second helical gear and the worm screw is improved, and an increase in friction at the meshing portion can be prevented. Therefore, the operation force of the drive mechanism for tilting the suspension arm is greatly reduced, especially when the suspension arm is tilted with the ladle on the floor, such as when attaching a candy to the upper part of the ladle. can do.

[Brief description of the drawings]

FIG. 1 is a partial 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 for receiving a pivot shaft.

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

FIG. 7 is a diagram showing a current change.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladle 1a, 2a Pivot shaft 3a, 3b Hanging arm 4a, 4b Reinforcement plate 5 Placement plate 7 Tilt mechanism 71 First helical gear 72 Second helical gear 73 Worm screw 72a, 73a Support Shaft 9a, 9b Support

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 41/06

Claims (1)

(57) [Claims] A holding portion having an insertion hole for inserting a pivot shaft joined to both sides of a ladle is provided at a lower end of a pair of hanging arms which can be hung. The holding part is integrally joined with a reinforcing plate, and the mounting plate fixed to one of the reinforcing plates is tilted to rotate the ladle relative to the suspension arm via a pivot shaft. A casting apparatus for molten metal to which a mechanism is attached, wherein the tilting mechanism is arranged above a first helical gear that is integrally rotatably attached to a pivot shaft. A second helical gear meshing with the first helical gear; and a second helical gear disposed above the second helical gear and meshing with the second helical gear, and driven by a driving mechanism. A second helical gear and a supporting shaft of the worm screw. Casting apparatus of the molten metal, characterized in that it is supported at both ends by a support portion erected on the mounting plate.