Device for extracting poured molds and method for extracting poured molds

Abstract

A device for extracting poured molds is provided in which a large torque force can be generated by using an electric motor at an initial stage in a device for extracting molds, and then an upward extraction operation can be performed at a high speed. An electric motor, a driving mechanism including a rotating drive shaft driven by the electric motor, a lifting frame supporting a lower surface of a sand mold part to cause thereof to be capable of lifting, a link member provided between the driving mechanism and the lifting frame, and a rise regulating device abutting on an outer periphery of the molding flask casting frame to regulate rising of the molding flask casting frame. The driving mechanism includes a shifting portion and an upward extraction portion.

1 - 6 . (canceled) 
     
     
         7 . A device for extracting poured molds comprising:
 an electric motor:   a driving mechanism including a rotating drive shaft driven by the electric motor;   a lifting frame configured to support a lower surface of a sand mold part serving as an inside of a casting frame of poured molds to cause the sand mold part to be capable of lifting;   a link member extending in a vertical direction and provided between the driving mechanism and the lifting frame; and   a rise regulating device abutting on an outer periphery of the casting frame to regulate rising of the casting frame when the lifting frame is raised, wherein   the driving mechanism includes:   a rotating drive shaft of the electric motor and a rotating arm portion, and the rotating arm portion converts rotation of the rotating drive shaft into vertical movement of the link member,   wherein a rotating portion is interposed between the rotating drive shaft and the rotating arm portion, and an axis of the rotating portion is eccentric with respect to a rotation center of the rotating drive shaft,   wherein a rotation radius of the rotating arm portion is larger than an amount of eccentricity of the rotating portion,   wherein rotation of the rotating drive shaft is transmitted to the rotating portion at a first stage of an initial rotation of the rotating drive shaft, so that the rotating portion rotates to shift the lifting frame upward corresponding to an amount of eccentricity via the link member, and the sand mold part in a state of adhering to the casting frame is separated from the casting frame,   wherein the rotation of the rotating drive shaft is transmitted to the rotating arm portion at a second stage of further rotating the rotating drive shaft, so that the rotating arm portion rotates to further extracting the lifting frame upward corresponding to the rotation radius of the rotating arm portion via the link member, and the sand mold part separated from the casting frame is moved to a conveyance position,   wherein an upward extraction force at the second stage is smaller than a shifting force at the first stage, and an upward extraction speed at the second stage is faster than a shifting speed at the first stage.   
     
     
         8 . A device for extracting poured molds comprising:
 an electric motor;   a driving mechanism including a rotating drive shaft driven by the electric motor;   a lifting frame configured to support a lower surface of a sand mold part serving as an inside of a casting frame of poured molds to cause the sand mold part to be capable of lifting;   a link member extending in a vertical direction and provided between the driving mechanism and the lifting frame; and   a rise regulating device abutting on an outer periphery of the casting frame to regulate rising of the molding flask when the lifting frame is raised, wherein   the driving mechanism includes   a shifting portion configured to shift the lifting frame upward relatively by a predetermined length in cooperation with the rise regulating device to separate the sand mold part from the casting frame in an adhered state at an extraction position where the sand mold part is extracted from the casting frame; and   an upward extraction portion configured to extract the shifted sand mold part upward to a conveyance position with a force smaller than a force of shifting by the shifting portion and at a speed higher than a speed of shifting by the shifting portion,   wherein the shifting portion includes a rotating portion having a cylindrical shape and including an axis parallel to a rotation center of the rotating drive shaft, the axis being eccentric by a predetermined dimension from the rotation center of the rotating drive shaft,   wherein the upward extraction portion is a rotating arm portion having a predetermined rotation radius extending in a radial direction of the rotating portion, and includes, on a base end portion side, an opening holding portion configured to hold an outer periphery of the rotating portion to be relatively rotatable, and includes, on a tip portion side, the rotating arm portion having a first link portion,   wherein the link member includes, at one end, a second link portion coupled to the first link portion of the rotating arm portion in a rotatable manner, and includes, at the other end, a third link portion,   wherein the lifting frame includes a fourth link portion linked to the third link portion in a rotatable manner, and   wherein a rotation angle regulating portion is provided between the opening holding portion and the rotating portion wherein when the rotating portion rotates relative to the opening holding portion by a predetermined angle, the relative rotation is regulated, and the rotating portion and the rotating arm portion rotate integrally.   
     
     
         9 . The device for extracting poured molds according to  claim 8 , wherein,
 the eccentric predetermined dimension of the shifting portion is a dimension for generating a first stroke in the vertical direction necessary for shifting the poured sand mold part in the casting frame from the inner wall of the casting frame, and at the same time, for causing the rotating portion to generate a force necessary for shifting by a rotational torque of the electric motor, and   a dimension of the predetermined rotation radius of the rotating arm portion is a dimension for generating a second stroke in the vertical direction necessary for extracting the sand mold part separated from the casting frame upward.   
     
     
         10 . The device for extracting poured molds according to  claim 8 , wherein a link biasing device configured to bias the link member at the time of lowering of the lifting frame, and the rotating arm portion rotates in a direction opposite to a direction at the time of rising is provided. 
     
     
         11 . The device for extracting poured molds according to  claim 8 , wherein
 the rise regulating device includes   at least a pair of hydraulic cylinders each including a piston rod capable of abutting on an outer periphery upper surface of an upper casting frame of the casting frame,   an oil tank including an oil layer storing hydraulic oil and an air layer generated above the oil layer,   a hydraulic switching valve provided between the oil tank and the hydraulic cylinder,   a pneumatic pump configured to apply a pressure to air to feed the air, and   a pneumatic switching valve provided between the pneumatic pump and the air layer of the oil tank, and   wherein hydraulic oil is supplied from the oil tank to the hydraulic switching valve by an air pressure applied to the air layer of the oil tank.   
     
     
         12 . A method for extracting poured molds using the device for extracting poured molds according to  claim 7 , the method comprising:
 by using the driving mechanism, shifting of relatively shifting the sand mold part by a predetermined length in the vertical direction to separate the sand mold part from the casting frame in an adhered state in cooperation with the rise regulating device at an extraction position where the sand mold part is extracted from the casting frame; and   upward extracting of extracting the shifted sand mold part upward to a conveyance position with a force smaller than a force of shifting by the shifting and at a speed higher than a speed of shifting by the shifting without changing the rotational torque of the electric motor itself.