Core sand filling device and core sand filling method in core making machine

A core sand filling device in an under-blow type core making machine in which core sand is blown from a lower part of a core box to an upper part of the core box,

• the core sand filling device in the core making machine comprising:
• the core box;
• a blow head which is placed below the core box so as to move up and down in a relative manner to the core box and divided into a sand blowing chamber and a sand storage chamber that are communicatively connected to each other;
• a compressed air supply unit which is communicatively connected to the sand storage chamber and supplies compressed air into the sand storage chamber;
• an aeration air supply unit which is communicatively connected to the sand blowing chamber and supplies into the sand blowing chamber aeration air for suspending and fluidizing core sand inside the sand blowing chamber;
• and
• an exhaust valve which is communicatively connected to the sand blowing chamber and exhausts compressed air remaining in the sand blowing chamber.