A ballistic screen is a screening device that uses ballistic balls to collide with the screen mesh to prevent material from clogging the mesh. It is widely used in powder screening processes in the chemical, food, pharmaceutical, and metallurgical industries. Due to the dust, vibration, and impact that often accompany its operating environment, problems such as screen clogging, reduced screening efficiency, and increased equipment noise can easily occur if not maintained promptly, potentially impacting production safety.

To extend equipment life, maintain screening efficiency, and reduce maintenance costs, scientific maintenance and routine maintenance of the ballistic screen are crucial.

Common Faults and Diagnosis Methods

1. Screen Damage

Causes: Prolonged impact, high material hardness, and insufficient mounting tension.

Diagnosis: Large particles are introduced during screening, resulting in reduced yield and visible cracks.

2. Wear or aging of the ballistic balls

Causes: Prolonged high-frequency impact, excessive temperatures, and highly abrasive materials.

Diagnosis: The screen mesh is prone to clogging, reduced screening efficiency, and cracks or hardening on the surface of the ballistic balls.

3. Abnormal vibration or increased noise

Cause: Loose eccentric block, damaged bearing, loose anchor bolts.

Diagnosis: Touch the machine body for uneven vibration or unusual noise.

4. Material leakage or dust emission

Cause: Deteriorated sealing strip, improper installation, or deformed screen frame.

Diagnosis: Visible dust or material leakage during operation.

5. Reduced screening accuracy

Cause: Screen clogged, insufficient screen tension, or insufficient vibration amplitude.

Diagnosis: Product particle size distribution exceeds the standard and production inspection fails.

Repair Methods and Procedures

1. Screen Replacement and Repair Procedures:

a. Shut down the machine and disconnect the power supply to ensure safety.

b. Remove the screen frame and remove the damaged screen.

c. Clean the screen frame slots and keep them free of debris.

d. Install the new screen, tension it evenly, and press it in place to lock it in place.

e. Check the sealing strip position and replace if necessary.

Note: Ensure the screen is evenly tensioned to prevent loosening or tearing during operation.

2. ballistic Ball Replacement Procedure:

a. Remove the screen and remove any aged or damaged ballistic balls.

b. Use compressed air or a brush to clean any debris from the slot.

c. Replace the new ballistic balls according to their model and reinstall the screen.

Note: The ballistic ball material must meet material hygiene and wear-resistance requirements.

3. Vibration Motor Maintenance Procedure:

a. Regularly check the tightness of the eccentric block bolts.

b. Replace the grease (high-temperature resistant lithium-based grease) every 1000 hours of operation.

c. If the bearings make any abnormal noise or heat, replace them immediately.

d. Seal and Shock Absorber Spring Replacement

Seal strips: If cracked, hardened, or deformed, replace them promptly to ensure effective sealing.

Shock absorber springs: If they are insufficiently elastic or broken, they will cause abnormal vibration amplitude and should be replaced as a set.

Daily Maintenance Points

1. Pre-Operation Inspection

Check all fasteners for looseness.

Check the condition of the screen and ballistic balls.

Ensure that the vibration motor rotates smoothly. Check the sealing strips for integrity.

2. Inspection During Operation

Observe the vibration for uniformity and abnormal noise.

Check for smooth material flow and blockages.

Pay attention to the motor temperature, which must not exceed the rated value.

3. Maintenance After Shutdown

Clean any residual material between the screen, baffle, and ballistic balls.

Apply rust-proof treatment to exposed metal parts.

Record operation and maintenance records and create an equipment file.

Safety Operations and Precautions

Repair or component replacement is strictly prohibited while the equipment is operating.

Maintenance work must be performed after disconnecting the power supply and displaying a warning sign.

When working at height, wear a safety belt to prevent falls.

For equipment in the food and pharmaceutical industries, use ballistic balls and seals that meet industry standards to prevent secondary contamination.

Management Recommendations for Extending Service Life

1. Develop a Maintenance Plan

Develop a periodic maintenance schedule based on the equipment's operating time and clearly identify responsible individuals.

2. Spare Parts Management

Adequate inventory of commonly worn parts (screens, ballistic balls, and sealing strips) should be maintained to avoid production stoppages due to spare parts shortages.

3. Operator Training

Educate operators on the operating principles, maintenance methods, and safety regulations of the ballistic screen to reduce operational errors.

4. Improve the Operating Environment

Control the temperature and humidity in the workplace to reduce dust accumulation and slow component aging.

Although the ballistic screen has a relatively simple structure, it operates in a complex environment, subjecting it to constant shock and vibration during operation. Scientific maintenance and routine care not only maintains efficient operation but also reduces downtime and repair costs, ensuring product quality and production safety. Enterprises should incorporate ballistic screen maintenance into their equipment management systems, implementing a "prevention-first, timely repair" approach to extend equipment life and achieve both economic benefits and improved production efficiency.

Author : Song Ying

Song Ying is a blog column writer. She has more than 8 years of experience in the manufacturing and service of environmental protection machinery. She has a deep understanding of the garbage screening and crushing industry and is happy to share practical industry knowledge and technology.