Where should safety warning slogans be hung on belt conveyors?

According to Article 28 of the "Regulations on the Administration of Safety Production in Construction Projects", the construction unit shall provide safety equipment at the entrance to the construction site, construction hoisting machinery, temporary power facilities, scaffolding, entrances and exits, and stairs. Set up obvious safety warning signs at dangerous locations such as entrances, elevator shaft entrances, hole entrances, bridge entrances, tunnel entrances, edges of foundation pits, storage areas for explosives and hazardous gases and liquids.