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4I3948
YASSIAN or Your's
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How to check the wear condition of the old bucket teeth before replacing them
I. Visual Inspection
1. Tooth tip wear
Observe whether the tooth tip has become blunt or missing. If the wear reaches one-third of the original thickness (for example, from a standard 50mm to S33mm), it should be replaced immediately.
Check whether there is spalling, cracking or plastic deformation on the tooth surface (commonly seen in hard rock conditions).
2. Wear distribution
The wear rate of the outer ring bucket teeth is usually 30% faster than that of the inner ring. If the height of the outer ring tooth tip is more than 2mm lower than that of the inner ring, it indicates that the position needs to be changed or replaced.
Ii. Dimensional Measurement
1. Tooth tip thickness detection
Use a vernier caliper to measure the remaining thickness of the tooth tip. Compare it with the new product specification (for example, if the standard thickness of the new product is 50mm, the actual measured S42mm means the wear exceeds 16%) and it needs to be replaced.
When the thickness of the hard alloy layer is less than 8mm(new products are usually 15mm), the impact resistance decreases significantly.
2. The tooth root fits with the tooth seat
Check the gap between the bucket teeth and the tooth seat: If a 0.5mm feeler gauge can be easily inserted, it indicates that the fit has failed and the tooth seat (teeth) needs to be replaced simultaneously.
If the seat wear exceeds 10%, it needs to be replaced.
Iii. Functional Testing
1. Loosening test
Check the shaking amplitude of the kick bucket teeth. If the displacement is greater than 2mm, it indicates that the pin shaft or the retaining ring has failed.
After disassembly, check the bending degree of the pin shaft: Place it flat on a dry platform. If the gap is greater than 1mm, it needs to be scrapped.
2. Assessment of associated damage
Abnormal wear of the bucket teeth may cause cracking of the bucket welds. It is necessary to check whether there are 23mm cracks in the stress concentration area of the bucket body.
Iv. Suggestions
Working condition adaptation record
In sandy soil conditions, the service life of flat teeth is approximately 200 hours. In hard rock conditions, it is recommended that RC-type rock teeth undergo mandatory testing every 150 hours.
Preventive maintenance: Clean the accumulated mud at the root of the bucket teeth every 50 hours to prevent the mud and sand from accelerating the wear of the pin shaft.
Operation mnemonic: Replace the sharp and blunt teeth by three parts (the tooth tip is reduced to one-third), the gap exceeds half a millimeter (gap >0.5mm), kick two milliliters (shake >2mm). Standardized detection can reduce the abnormal wear rate of bucket teeth by 40%.
v
How to check the wear condition of the old bucket teeth before replacing them
I. Visual Inspection
1. Tooth tip wear
Observe whether the tooth tip has become blunt or missing. If the wear reaches one-third of the original thickness (for example, from a standard 50mm to S33mm), it should be replaced immediately.
Check whether there is spalling, cracking or plastic deformation on the tooth surface (commonly seen in hard rock conditions).
2. Wear distribution
The wear rate of the outer ring bucket teeth is usually 30% faster than that of the inner ring. If the height of the outer ring tooth tip is more than 2mm lower than that of the inner ring, it indicates that the position needs to be changed or replaced.
Ii. Dimensional Measurement
1. Tooth tip thickness detection
Use a vernier caliper to measure the remaining thickness of the tooth tip. Compare it with the new product specification (for example, if the standard thickness of the new product is 50mm, the actual measured S42mm means the wear exceeds 16%) and it needs to be replaced.
When the thickness of the hard alloy layer is less than 8mm(new products are usually 15mm), the impact resistance decreases significantly.
2. The tooth root fits with the tooth seat
Check the gap between the bucket teeth and the tooth seat: If a 0.5mm feeler gauge can be easily inserted, it indicates that the fit has failed and the tooth seat (teeth) needs to be replaced simultaneously.
If the seat wear exceeds 10%, it needs to be replaced.
Iii. Functional Testing
1. Loosening test
Check the shaking amplitude of the kick bucket teeth. If the displacement is greater than 2mm, it indicates that the pin shaft or the retaining ring has failed.
After disassembly, check the bending degree of the pin shaft: Place it flat on a dry platform. If the gap is greater than 1mm, it needs to be scrapped.
2. Assessment of associated damage
Abnormal wear of the bucket teeth may cause cracking of the bucket welds. It is necessary to check whether there are 23mm cracks in the stress concentration area of the bucket body.
Iv. Suggestions
Working condition adaptation record
In sandy soil conditions, the service life of flat teeth is approximately 200 hours. In hard rock conditions, it is recommended that RC-type rock teeth undergo mandatory testing every 150 hours.
Preventive maintenance: Clean the accumulated mud at the root of the bucket teeth every 50 hours to prevent the mud and sand from accelerating the wear of the pin shaft.
Operation mnemonic: Replace the sharp and blunt teeth by three parts (the tooth tip is reduced to one-third), the gap exceeds half a millimeter (gap >0.5mm), kick two milliliters (shake >2mm). Standardized detection can reduce the abnormal wear rate of bucket teeth by 40%.
