Molten Metal Supply Device

Abstract

A molten metal supply device designed to mount a ladle-rotating motor on a support frame and dispose a ladle-rotating rotation transfer mechanism in a predetermined link of a ladle-carrying link mechanism so as to be able to perform precise position control (tilt angle control) of a ladle. The rotation transfer mechanism is driven by the ladle-rotating motor mounted on the support frame so as to rotate the ladle. The rotation transfer mechanism is provided in a link of the ladle-carrying link mechanism for carrying the ladle. The rotation transfer mechanism is constituted by two parallel linkages. Each parallel linkage has a pair of bar links whose opposite ends are attached to two rotors respectively. When the ladle-rotating motor is being stopped, the ladle can be kept in a predetermined posture by the parallel linkages even if the ladle-carrying link mechanism has any operating posture.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a molten metal supply device for use in a cold-chamber die-casting machine.BACKGROUND OF THE INVENTION[0002]A molten metal supply device uses a ladle to scoop up a predetermined quantity of molten metal from a melting furnace. The ladle is carried to the upper side of a supply port of a shot sleeve. The molten metal in the ladle is injected into the shot sleeve through the supply port. Such a molten metal supply device is often designed to carry the ladle with a ladle-carrying link mechanism, and rotate (tilt) the ladle with a ladle-rotating rotation transfer mechanism.[0003]JP-A-09-108815 (Patent Document 1) discloses such a molten metal supply device in a die-casting machine. In this Patent Document 1, a ladle-rotating rotation transfer mechanism composed of parallel linkages (parallelogram linkage) is constituted by one link (which rotatably retains the ladle on its tip) disposed in a ladle-carrying link mechanism and t...

AI Technical Summary

Benefits of technology

[0008]The present invention was developed in consideration of the aforementioned problem. An object of the present invention is to make it possible to perform precise position control (tilt angle control) of a ladle in a molten metal supply device in which a ladle-rotating motor is mounted on a support frame, and a ladle-rotating rotation transfer mechanism is disposed in a predetermined link of a ladle-carrying link mechanism.

[0009]In order to attain the foregoing object, the present invention provides a molten metal supply device in which a predetermined quantity of molten metal is scooped from a melting furnace by a ladle, and the molten metal in the ladle carried to an upper side of a supply port of a shot sleeve is injected into the shot sleeve through the supply port. In the molten metal supply device, a ladle-rotating rotation transfer mechanism is provided in a predetermined link of a ladle-carrying link mechanism for carrying the ladle. The ladle-rotating rotation transfer mechanism is driven by a ladle-rotating motor mounted on a support frame so as to rotate the ladle. The rotation transfer mechanism is constituted by two parallel linkages each having a pair of bar links whose opposite ends are attached to two rotors respectively. The ladle can be kept in a predetermined posture by the parallel linkages even if the ladle-carrying link mechanism has any posture when the ladle-rotating motor is being stopped.

[0010]In the molten metal supply device, the ladle-rotating motor is mounted on the support frame side, and the ladle-rotating rotation transfer mechanism is disposed in a predetermined link of the ladle-carrying link mechanism. Thus, the ladle-carrying link mechanism can be made comparatively light in weight, and the appearance can be also improved. In the molten metal supply device designed thus, the ladle-rotating rotation transfer mechanism is constituted by the combination of two parallel linkages each having a pair of bar links whose opposite ends are attached to two rotors respectively. Accordingly, the ladle-rotating rotation transfer mechanism can be made superior in rotation transfer accuracy free from looseness or extensional deformation. Thus, precise position control (tilt angle control) of the ladle can be achieved.

Problems solved by technology

Thus, there is a problem that the ladle-carrying link mechanism becomes so massive that a large-scale motor must be used as a ladle-carrying motor.

In the rotation transfer mechanism using a chain, however, the guarantee of transfer accuracy is limited due to looseness, extensional deformation, etc.

Thus, there is a problem that it is difficult to perform precise position control (tilt angle control) of the ladle, that is, precise control of the quantity of molten metal scooped by the ladle.

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