Equipment for intermittent vacuum casting of large steel ingots with multiple sliding nozzle packages and special diversion tubes

Abstract

The invention belongs to the field of vacuum ingot casting, and discloses a device for conducting interrupted vacuum pouring on a heavy ingot through sliding nozzle ladles and special guiding pipes. The defects that during vacuum ingot casting in the prior art, molten steel is contaminated by secondary oxidation caused by the atmosphere and fireproofing materials, and a plug of a stopper rod is easily broken can be overcome. The device is characterized in that an upper heightened flange and a lower heightened flange at the bottom of a steel ladle and a vacuum cover are internally provided with sliding nozzles, mechanisms of the sliding nozzles, and transposers capable of enabling an upper guiding pipe and a small vacuum cover to sit on a lower guiding pipe. A ladle sitting in the front is vacuumized, the sliding nozzles are opened, molten steel passes through the upper guiding pipe and the lower guiding pipe, a large amount of molten steel flow is deflated to be sprayed into a raindrop shape so as to fall into a die to be poured completely, and the sliding nozzles are closed. The transposers are lifted and rotated to enable the small vacuum cover to press the lower guiding pipe to seal the interior of a vacuum chamber, an empty ladle is hoisted away and replaced with a new sitting ladle after vacuum of a small vacuum chamber is damaged, the small vacuum chamber is vacuumized, the upper guiding pipe is lifted and rotated to sit on the lower guiding pipe, the sliding nozzles are opened, pouring starts to be conducted on the second ladle, and the later steps are the same as above after pouring. The empty ladle is hoisted away and replaced with the next sitting ladle, the sliding nozzless are closed after the pouring is conducted on the last ladle, vacuum breaking is carried out, and a heating insulating agent is added in a dead head.

Description

technical field

[0001] The invention belongs to the technical field of vacuum ingot casting

[0002] technical background

[0003] The equipment and process of the existing vacuum ingot casting technology seem to be simple and practical, but the biggest disadvantage is:

[0004] 1. When the ladle is poured in the atmosphere, the molten steel strands are in close contact with the atmosphere to absorb hydrogen and oxygen in oxygen, nitrogen and water in the atmosphere, so that the [H] content in the molten steel is increased and metal oxides and nitrides are formed. The molten steel strands are formed by the tundish When vacuum pouring is carried out in the molten steel, [H] increased in molten steel can be released in large quantities, while oxides and nitrides are very stable, not easy to decompose, and remain in the steel in the state of large particles of harmful inclusions. In addition, the tundish lining rod sleeve Bricks and plug bricks will also bring larger particles ...

Images