How to avoid short circuit fusing of components in trolley furnace

How to avoid short circuit fusing of components in trolley furnace

Reasons for short-circuit fusing of alloy components of trolley furnace:

　　1. Poor component installation, heat-resistant steel hook deformed, burned or not tightly hooked, causing contact short circuit.

　　2. Furnace pots, crucibles, baskets, etc. are not placed upright in the furnace.

　　3. When the components are placed in the furnace bottom, the bottom plate is not tightly covered and the oxide scale is dropped.

　　4. The material of the furnace pot, pile, bottom plate, etc. is not good. The oxidation is serious, and the large pieces are peeled off to the components.

　　5. The workpiece touches the component during loading or is not stacked well, and the component collapses and touches the component.

　　6. When the trolley furnace is dumped, the components are easy to fall out and touch the tower vortex; the iron oxide scale on the crucible or the molten liquid from the furnace is easy to fall on the components.

　　7. The nitrate in the nitrate furnace flows down the citrus disaster.

　　8. The carbon black in the trolley furnace is serious, and the carbon deposits into filaments or the brick body is carburized to form a conductor, causing arcing.

　　9. The damage of the shelf bricks was not repaired in time, and the components drooped.

      10. The core rod is oxidized and bent, and the outer refractory tube is broken, causing the resistance wire wound on the tube to contact the core rod.

The main points of maintenance to avoid short circuit of the trolley furnace:

　　1. The lower teeth of the furnace door and the ring knife of the pit furnace cover must be inserted into the sand sealing groove tightly. The sand in the sand seal should not be overfilled and should be level. If sand falls into the furnace, clean it up in time. For low-temperature furnaces, a layer of intact asbestos rope or refractory fiber rope liner can be used.

　　2. The cover of the brass holding furnace must be connected tightly to prevent the "copper frost" from falling into the furnace and corroding the components.

　　3. The iron oxide scale in the furnace must be cleaned up frequently with a brush, broom or compressed air to prevent it from falling on the alloy element and causing a short circuit. Generally, it should not be less than once a day.

　　4. The externally heated salt bath furnace should regularly lift the orange vortex and remove the molten salt. The condensed salt on the surface of the element can be cleaned with hot water; the condensed salt on the shelf can be removed by scraping.

　　5. Heat-resistant steel components such as bottom plates, oranges, furnace pots, etc., should be lifted and knocked after a period of use to remove the oxide scale, so as not to collapse or bury the components. Especially for chromium-manganese-nitrogen steel, the spalling is more serious in the later period.