rotary screener/screening machine/trommel instruction manual

Introduction: What is a fertilizer rotary screener?

• The trommel screen is a general mechanical equipment widely used in screening various granular materials. Its design features include simple structure, simple operation, and easy screen replacement. By replacing the screens of different sizes, materials of different particle sizes can be screened out to meet the screening needs of a variety of granular materials. rotary screening mahcine  are widely used in different industries but mostly in fertilizer production lines and sand processing plant, and can effectively improve production efficiency and screening quality compare to the vibrate screener.

Working principle and structure of rotary screening machine

1. The basic working principle of the trommel screen is that after the particles rotate with the screen drum to a certain height, they are thrown down under the action of gravity and screened through the screen. The middle of the screen drum adopts shaftless transmission, the power end is supported on the frame through bearings, and the other end supports the drum body through supporting wheels. Its structure mainly includes the following parts:
2. Transmission part: provides power to rotate the drum.
3. Rotary drum: the main part of screening materials.
4. Frame: supports the entire trommel screen structure.
5. Supporting wheel part: supports and stabilizes the roller.
6. Overscreen material hopper and underscreen material hopper: channels for materials to enter and exit the screen cylinder.
7. Dust-proof device: Prevent the spread of dust generated during the screening process.
8. Distributor: ensures that materials are evenly distributed on the screen. The screen mesh is made of steel wire mesh, and the mesh size can be configured according to the user’s process requirements.

In order to facilitate transportation and installation, each part of the trommel screen is welded and designed with future maintenance and repairs in mind. It is equipped with a quick-opening device door and a split-design dust-proof device to facilitate installation and maintenance.

Safety operating procedures for drum screening equipment

1. Inspection before operation: Check electrical equipment and instruments: Make sure all electrical equipment and instruments are intact.
2. Clean the debris in the trommel screen: Open the access door, check and clean the ore or other debris in the trommel screen.
   Manual turning inspection: Use manual turning to rotate the drum to ensure that it rotates flexibly and has no jamming.
3. Check the tightening condition of each component: Check whether each bolt is loose or broken, and ensure that all fasteners are firm and reliable.
4. Check the lubrication condition: ensure that each bearing seat and gearbox are well lubricated, the oil level is moderate, and the protective cover is intact.
5. Check the tightness of the drive chain: Make sure the drive chain is properly tight.
6. Run No-load start: The trommel screen must be started under no-load condition.
7. Observe the discharging situation: After starting, observe whether the discharging is normal, and then close the sealing isolation cover after confirming that it is normal.
8. Regular inspections: Operators conduct inspections of the equipment every hour to check the discharge particle size, material leakage and dust.
9. Check the motor and transmission components: Regularly check the temperature rise of the motor and transmission components and whether there are any abnormal noises
10. Dealing with slag blocking: timely check whether there is slag blocking at the inlet and outlet and deal with it.
11. shutdown Sequence: Confirm that screening is complete: Before each shutdown, it must be confirmed that all materials in the drum have been screened before the machine can be shut down.
12. Check the equipment: After shutdown, conduct a comprehensive inspection of the equipment. If any abnormalities are found, they must be dealt with immediately.
13. Clean equipment and environmental sanitation: Improve equipment and environmental sanitation, fill in operation records, and do a good job in shift handover.

Precautions for installation of rotary screen machine and equipment inspection

This equipment is assembled and debugged by the manufacturer and supplied in sets. After receiving the equipment, the user should carefully check with the supplier to discover and eliminate problems that may arise during transportation.

1. Horizontal deviation requirements: The horizontal deviation of the machine is required to be no more than 2 mm/meter.
2. Avoid additional loads: No other objects are allowed to be placed on all mechanisms of the equipment to avoid affecting the strength and stiffness of the equipment.
3. Clean the installation tools: After installation, the installation tools should be cleaned, and no foreign matter is allowed to remain outside the screen cylinder.
4. Fastener inspection: Make sure all fasteners are firm and reliable before conducting a no-load test run.
5. No-load debugging wiht No-abnormal noise: The equipment operates without excessive or abnormal noise.
6. Temperature rise check: After continuous operation for 2 hours, the bearing temperature rise shall not exceed 70 degrees Celsius.
7. Carry out a load test run after confirming that it is normal: After confirming that there are no abnormalities in the no-load test run, you can proceed with a load test run.
8. Load test run: Uniform loading: After the equipment is operating normally, it can be loaded evenly until it is fully loaded.
9. No significant impact sound: The equipment must not have excessive or significant impact sounds.
10. Long-term operation inspection: The equipment operates continuously for 8 hours, and the bearing temperature rise does not exceed 70 degrees Celsius.
11. Stop feeding before stopping: stop feeding before stopping, and wait until the material in the screen cylinder is completely removed before stopping.
12. Put into production and use: It can be put into production and use if it meets the above conditions.
13. It is strictly prohibited to make adjustments while the equipment is running: It is strictly forbidden to make adjustments while the equipment is running.

Lubrication and maintenance of trommel screen equipment

• Always pay attention to and promptly lubricate all parts of the equipment to ensure the normal operation of the machine and extend the service life of the equipment.
• The organic and inorganic compound fertilizer disc drum screen uses calcium-based grease, and the reduction box uses 220# gear oil. The chassis should be refueled when starting for the first time.
• All parts that need lubrication have been filled with grease before the machine leaves the factory. The user determines the lubrication cycle according to the specific usage conditions. The equipment body is equipped with two lubrication parts, which are located on the bearing seats at the head and tail.
• Lubrication should be carried out after parking, and the motor and reducer should be lubricated according to their instructions.

How to maintain the drum screening machine

• The drum screening machine equipment should be managed and cared for by dedicated personnel. Maintenance and repair must be carried out after parking. It is strictly prohibited to carry out maintenance and repair while the equipment is running.
• Equipment management and maintenance personnel should frequently inspect the operation of the equipment, such as whether the fasteners are reliable and the rotating parts are flexible. After work, the equipment must be cleaned of dirt that blocks the mechanism.
• Under normal operating conditions, the temperature rise of the fertilizer NPK rotary screener bearings should not exceed 40 degrees Celsius, and the maximum temperature rise should not exceed 70 degrees Celsius. When the above temperature is exceeded, the rotary screening machine should be stopped immediately, the cause should be identified and the fault should be eliminated in time. Feeding should be stopped before stopping, and the motor can be turned off only after the material in the screen cylinder is completely discharged.

Precautions for shutting down the trommel rotary screening machine

• Before shutting down the organic matter trommel screen, the feed should be stopped first, and the power supply should be cut off after the material in the cylinder is exhausted.
• It is strictly forbidden to start the trommel screen after feeding, otherwise the screen may be torn due to excessive torque, affecting the service life of the machine.
• If the trommel screen is shut down due to abnormal conditions, when it is started again, the material in the cylinder should be cleaned before starting.
• Uniform feeding of trommel screen: Feeding must be even when starting up. Uneven feeding is strictly prohibited to avoid affecting the screening quality.

Summarize

As an efficient fertilizer screening equipment, the trommel screen is widely used in a variety of industries due to its dedusting adventage compare to the vibrate screener and flexible screen replacement mechanism. Through strict safety operating procedures, reasonable installation and debugging, timely lubrication and maintenance, trommel screen’s service life can last at least 10 years, thereby improving production efficiency and screening quality.