When cleaning residual materials inside the drum of a biology organic fertilizer dryer, strict adherence to safety operating procedures is essential to prevent risks such as electric shock, mechanical injury, dust explosion, and suffocation.

Before cleaning, the main power supply to the equipment must be disconnected, the feed and hot air valves closed, and a "Equipment Under Maintenance, Do Not Power On" warning sign displayed. A designated person must monitor the operation, and entry into the drum while the equipment is powered on or heated is strictly prohibited. Only after the drum has completely stopped and the internal temperature has dropped to room temperature should the inspection and observation ports be opened for ventilation to ensure air circulation and prevent burns and the accumulation of harmful gases.

When entering the drum for cleaning, operators must wear dust masks, protective goggles, abrasion-resistant gloves, and non-slip safety shoes. Lighters, mobile phones, and other flammable and explosive items are prohibited. A designated person must be present outside the drum to assist. Single-person entry into the drum is strictly prohibited. Simultaneously, check that the drum is securely fixed to prevent accidental rolling or rotation of the equipment. During the cleaning process, use soft tools such as wooden or bamboo shovels. Avoid using metal objects to forcefully strike the cylinder and lifting plates to prevent damage to the internal lining and steel structure of the fertilizer production machine.

When cleaning, remove clumps of material and dust gradually from top to bottom to prevent large-scale material collapse that could bury personnel. Scattered dust should be promptly swept and collected; indiscriminate scattering is prohibited to prevent excessive dust concentrations and potential safety hazards. If deformed, detached, or severely worn lifting plates are found inside the cylinder, record the incident and report it to maintenance.

After cleaning, count the tools and personnel, confirm that there is no debris left inside the cylinder, close the inspection port, and restore the equipment's protective devices. Finally, clean up the dust on site and keep the work area clean. Throughout the entire process, strictly prohibit any unauthorized operations to ensure the safety of both personnel and equipment.