Excessive noise after installation of vibration equipment may be caused by structural resonance, loose components, or improper installation. Here are 5 systematic solutions, combined with mechanical principles and practical operation and maintenance experience:

　　1、 Eliminating structural resonance issues

　　1. Adjust the deviation between the vibration frequency and the natural frequency

　　Reason: The vibration frequency of the equipment is close to the natural frequency of the supporting structure (such as a steel platform), causing resonance amplification noise.

　　Solution: Adjust the motor speed by ± 5% through a frequency converter (such as changing the original 1450rpm to 1380 or 1520rpm) to avoid resonance points.

　　Example: The original noise of a vibrating screen in a certain mine was 108dB, but after adjusting the frequency, it decreased to 92dB.

　　2. Increase structural damping

　　Operation steps: Install a rubber metal composite shock absorber pad (recommended Shore hardness 60-70HA) between the equipment base and foundation.

　　Apply constraint layer damping material (such as 3M damping tape) to steel structure support beams to reduce sound radiation efficiency.

　　2、 Optimize the coordination of mechanical components

　　1. Correct the phase angle of the eccentric block

　　Problem location: For equipment driven by dual vibration motors, if the angle deviation of the eccentric block is greater than 2 °, it will generate torque imbalance and cause abnormal noise.

　　Operation process: After stopping the machine, measure the angle of the eccentric blocks on both sides of the motor (using a laser angle meter).

　　Adjust synchronously to the standard angle according to the equipment manual (usually 0 ° for linear screens and 90 ° for circular vibrating screens).

　　Test the machine without load and use a decibel meter to measure until the noise difference between the two sides is less than 3dB.

　　3、 Resolve friction and collision noise

　　1. Check for interference from moving parts

　　Inspection location: The gap between the screen mesh and the side plate (should be ≥ 10mm, if it is too small, a U-shaped rubber strip buffer should be added).

　　The distance between the spring support and the limit block (leaving a 5-8mm margin of movement).

　　Bolt anti loosening measures (fixed with double nuts or thread glue to avoid loosening and impact).

　　2. Upgrade the lubrication system

　　Applicable scenarios: Sharp noise from bearings or gear transmission equipment (such as vibrating feeders).

　　Solution: Use high-frequency lithium based grease lubricant (such as Shell Gadus S2 V220), which has stronger temperature resistance and shear resistance.

　　Install an automatic oil injection device to ensure that the bearings are lubricated with 1-2g of grease every 8 hours.

　　4、 Acoustic wrapping technology (for high-frequency noise)

　　Implementation method: Wrap the vibration motor casing with composite soundproof cotton (aluminum foil+glass fiber, thickness ≥ 50mm), which can reduce noise by 6-8 dB.

　　Install a detachable sound-absorbing barrier (metal plate with a perforation rate of 30% and rock wool lining) around the device, suitable for indoor installation scenarios.