Device for controlling hardness of medium and large tonnage excavator valve casting

The utility model discloses a device for controlling the hardness of medium and large tonnage excavator valve castings, which relates to the technical field of large tonnage excavator valve body casting and comprises a casting mould and a pouring gate positioned on one side of the casting mould and used for uniformly dispersing inlet water. The pouring gate comprises a transverse pouring gate, and a straight pouring gate used for water inflow is arranged at one end of the transverse pouring gate. According to the device for controlling the hardness of the medium-and-large-tonnage excavator valve casting, the casting mould and the dead head are made of heat preservation materials, so that heat preservation is carried out on molten iron, a feeding channel of the casting is provided, the molten iron enters the bottom mould and the top mould through the pouring gate in a uniform dispersing mode, the dead head is matched with the chilling block, solidification of the molten iron is smoother, and the hardness of th