The reasons and analysis for the noise generated by the manual hoist reducer of the overhead crane are as follows:

1、 Gear related issues

Gear wear or damage

Reason: Long term load operation leads to tooth surface wear, or uneven tooth surface hardness causes dent damage.

Performance: Increased noise, intensified vibration, and in severe cases, the crane cannot function properly.

Solution: Regularly check the wear of the gears. When the wear of the gear thickness reaches 10% -20% (high-speed) or 20% -30% (ordinary equipment), the gears need to be replaced.

Insufficient gear machining accuracy

Reason: The low precision of gear manufacturing leads to large errors in work stability.

Performance: Impact and vibration occur during the meshing process, causing high-frequency impact sound.

Solution: Optimize gear structure design, improve bending strength, select appropriate displacement coefficient and helix angle, strictly limit instantaneous speed ratio changes.

Poor gear contact accuracy

Reason: Poor tooth contact caused by tooth alignment error, pitch deviation, or tooth profile error.

Performance: Uneven contact in the direction of tooth length or tooth height, significantly increasing noise.

Solution: By repairing the edges and roots, the tooth profile of the tooth top can be treated to avoid interference; Adjust gear parameters to improve the distribution of contact spots.

Low gear motion accuracy

Reason: Inaccurate transmission of gear motion and excessive angular error.

Performance: Low frequency noise is generated, and the noise intensifies as the error increases.

Solution: Strictly control the precision of gear movement and reduce periodic errors.

The wheel body is eccentric and heavy

Reason: Uneven distribution of wheel mass leads to unbalanced centrifugal force.

Performance: Vibration of the wheel system, causing noise.

Solution: Perform dynamic balance testing on the wheel body to ensure even quality distribution.

2、 Bearing issues

Bearing damage or wear

Reason: The bearing wears out after long-term operation or falls into debris during assembly.

Performance: Increased noise, possibly accompanied by intermittent hoarseness or loud impact sounds.

Solution: Check the condition of the bearings and replace damaged bearings in a timely manner; Clean up debris during the assembly process.

Inappropriate bearing clearance

Reason: The bearing clearance is too large or too small, resulting in unstable operation.

Performance: Increased noise and intensified vibration.

Solution: Adjust the bearing clearance to a suitable range according to actual needs.

3、 Lubrication issues

Insufficient lubrication

Reason: Insufficient lubricating oil or aging lubricating oil.

Performance: Friction between gears and bearings increases, resulting in increased noise.

Solution: Regularly check the lubricating oil level and quality, and promptly replenish or replace the lubricating oil.

Lubricating oil pollution

Reason: Impurities or metal particles are mixed into the lubricating oil.

Performance: Increased gear and bearing wear, increased noise.

Solution: Use clean lubricating oil, regularly replace and clean the lubrication system.

4、 Assembly and installation issues

Insufficient assembly accuracy

Reason: Abnormal gear transmission, excessive or insufficient meshing backlash, poor tooth surface meshing.

Performance: Increased noise and intensified vibration.

Solution: Improve assembly accuracy, ensure normal gear transmission, and appropriate meshing backlash.

Improper installation

Reason: Resonance occurs between the reducer and the foundation support or connecting components.

Performance: Increased noise and intensified vibration.

Solution: Optimize installation process to avoid resonance; Use high toughness and high damping base materials.

Loose components

Reason: Loose components such as bearing pre tensioning mechanism and shaft positioning mechanism.

Performance: Inaccurate system positioning, abnormal position engagement, resulting in vibration and noise.

Solution: Check and tighten all components to ensure stable connection.

5、 Design and Manufacturing Issues

design flaw

Reason: The gear accuracy level design is unreasonable and does not fully consider economic factors and industrial production needs.

Performance: Increased noise and unstable performance.

Solution: Scientifically and reasonably determine the accuracy level of gears and optimize design parameters.

Insufficient manufacturing accuracy

Reason: Outdated processing and manufacturing technology leads to substandard precision of components.

Performance: Increased noise and shortened service life.

Solution: Improve processing and manufacturing technology, develop advanced assembly processes, and strictly implement national and international standards.

6、 Load and operational issues

Load overload

Reason: The gearbox is subjected to forces exceeding its rated load.

Performance: Increased noise and vibration may damage the equipment.

Solution: Check the load condition to ensure that the gearbox is operating within the normal load range.

Running speed too high

Reason: The input speed of the gearbox is too high.

Performance: Increased noise and intensified vibration.

Solution: Adjust the operating speed of the gearbox according to actual needs.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment