| 摘要 |
The present invention provides a cover comprising: a cover frame having one side opened; a passage which penetrates a wall of the cover frame and which is communicated with an opened space of the cover frame; and an insertion and separation unit inserted in or separated from the passage. Therefore, the cover according to the present invention is provide to close the passage, which is provided on the cover frame, by inserting an insertion and separation unit when the cover frame is coated with refractories, thereby preventing water and the refractories from flowing down into the passage; to separate the insertion and separation unit from the passage after the refractories are coated, thereby quickly and smoothly discharging the water used together with the refractories; to prevent the cover frame from being deformed by gas since the gas, which is generated by the reaction of a liquid substance during processes of storing, transferring and injecting the liquid substance, is discharged through the passage of the cover frame to the outside, thereby extending a service life of the cover; to include a fluid passage and an outlet which are communicated with the passage of the cover frame and extending inside the refractories, thereby quickly discharging internal water and gas; and to have an extended service life by being evenly dried to improve the adhesive quality of the refractories and to prevent the crack and separation of the refractories, thereby saving expenses by reducing materials being used and the number of times being repaired. |
