Instrument device for monitoring molten iron leakage of casting mold in vacuum suction casting chamber

Abstract

The invention relates to an instrument device for monitoring molten iron leakage of a casting mold in a vacuum suction casting chamber. The instrument device adopts a high-sensitivity temperature sensor probe and a pressure sensor probe to be simultaneously installed at the top of the suction casting chamber, in case of molten iron leaks from the casting mold in the sealed vacuum suction casting chamber, through the slight temperature change and the slight change of vacuum degree at the instant molten iron breaks through a mold cavity, signals are sent in parallel to enable a vacuum air supplementing valve to close a vacuum channel and open an air supplementing channel, so that the vacuum degree is rapidly reduced, suction casting is stopped, and molten iron leakage is prevented from expanding. The device does not use sensors with contacts or optical signals which can only monitor a partial area when the optical signals are blocked, and the device can completely cover the suction casting chamber, thereby preventing vacuum suction casting equipment from being damaged.

Description

technical field [0001] The monitoring instrument device for the leakage of molten iron in anti-gravity casting molds in foundry industry. Background technique [0002] In the field of anti-gravity casting in the foundry industry, vacuum suction casting is a completely anti-gravity casting method. Vacuum suction casting must keep the mold in a vacuum state, and use the pressure difference established in the vacuum state to make the molten iron flow from the crucible under atmospheric pressure. Press molten iron from the riser into the cavity of the mold. Vacuum suction casting has good filling and feeding properties, mainly because the filling pressure of molten iron is affected by the degree of vacuum. The higher the degree of vacuum, the more complete the mold filling and the more thorough the feeding. However, if the vacuum is too high, the mold will be subjected to the pressure of the molten iron on the cavity. If the mold strength is lower than the filling pressure of t...

AI Technical Summary

Problems solved by technology

The higher the vacuum degree, the more complete the mold filling and the more thorough the feeding. However, if the vacuum is too high, the mold will be subjected to the pressure of the molten iron on the cavity. If the mold strength is lower than the filling pressure of the molten iron, the mold will be Type cracking, molten iron leakage failure

[0003] In the prior art, in order to prevent the vacuum suction casting from leaking molten iron to the casting mold and causing damage to the suction casting chamber, wires are embedded in the mold wall, various sensors or infrared imaging are installed, but the casting mold is in the suction casting chamber After installation, the surrounding space is narrow, and due to the uncertainty of the location of molten iron leakage in the casting mold, various monitoring devices not only cannot cover all the casting molds, but also the reflection speed cannot keep up with the speed of damage to the suction casting chamber after the molten iron leaks.

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