Automatically-returning mold ejection device and casting mold comprising the same

An automatically-returning mold ejection device, comprising:

• a lower-portion part and an upper-portion part, and the lower-portion part of the device further comprises returning rod ejection columns fixed to a mold rack base plate;
• the upper-portion part further comprises returning rods corresponding to the returning rod ejection columns, and the top ends of the returning rods are fixed to an ejection rod pushing plate and penetrate through an upper mold connecting plate through returning rod flanges;
• a lower mold core of a mold is fixed to the mold rack base plate through a screw, and the mold rack base plate is fixed to a mold casting machine table;
• the upper-portion part of the device includes hoisting screws, upper mold core water distributors, second screws, ejection rod pressing plate limiting columns, the ejection rod pushing plate, the returning rod flanges, reset springs, returning rod connecting plates, third screws, ejection rod pressing plate limiting blocks, returning rod guide sleeves, fourth screws and the upper mold connecting plate;
• the upper portions of the returning rods penetrate through the returning rod guide sleeves and the returning rod flanges, and the tops of the returning rods are fixedly connected to the ejection rod pushing plate through the returning rod connecting plates;
• the returning rod flanges fix the returning rods in flange circular grooves formed in the upper mold connecting plate through the third screws;
• the upper-middle positions of the returning rods are sleeved with the reset springs, the reset springs are located at the circular hole positions of the flange centers of the returning rods and are configured to make the lower ends of the reset springs in contact with flange circular groove planes of the upper mold connecting plate and the upper ends of the reset springs in contact with lower planes of the returning rod connecting plates, so that the reset springs are compressed and spring back only in the vertical direction, rather than lateral deviation or deflection;
• the ejection rod pressing plate limiting blocks are fixed to the upper mold connecting plate through bolts;
• and
• the returning rod ejection columns are configured to achieve that the closing of an upper mold core and a lower mold core is already completed and ejection rods already return to original positions when the bottom end faces of the returning rods are in contact with the upper end faces of the returning rod ejection columns.