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How Do I Choose The Right Ground Engaging Tool?
2023-04-27
Excavator bucket teeth
The Problem of Bucket Teeth Failure of Excavator
2023-05-04

Choosing excavator bucket teeth effectively, wear resistance will be improved!

  • Excavator bucket teeth can be said to be a part of the machine users love and hate, on the one hand, bucket teeth as the pioneer bucket, for the excavator shovel soil, shovel stone, digging ditch invincible. On the other hand, the bucket teeth wear quickly, high replacement frequency, increased costs, so the excavator heartache!
  • Why do the bucket teeth with similar price always last longer than you? Why do you spend a lot of money on bucket teeth? Why is it that the bucket teeth you buy at a high price are sometimes not as good as the ones you used to buy cheaply? Today we will learn more about bucket teeth.

Classification of bucket teeth

  • Earth teeth (for excavation in light working environment such as dirt, sand, stone, etc.) Generally, earth teeth have larger bucket mouth area and larger stacking surface, so the loading factor is higher, saving working time and high efficiency.
  • Rock teeth (for ore, quarry) after blasting ore loading, etc., heavy-duty work strength wear-resistant steel, better excavation performance, more outstanding economy.
  • Tapered teeth (for coal mine, underground mining) are mainly suitable for drilling into rock formations with low hardness and high impact force.

Installation of bucket teeth

The common mounting methods are direct mounting and cross mounting of bucket teeth.

  • Horizontal mounting means that the pin is mounted parallel to the front end of the bucket teeth.
  • Directly mounted bucket teeth
    It is more convenient to disassemble and crush directly from the top, and there is a large operating space.
  • In the excavation, the straight mounted tooth pin will be subject to the extrusion pressure of the material being dug, and if the excavation force is large, the clamping force of the spring will not reach the requirement, which will easily lead to the tooth pin falling off, so this structure, although easy to disassemble and install, is generally used for small excavators with low tonnage.
  • Transverse mounted bucket teeth
    Less convenient disassembly, side operation space is small, more difficult to give force. When dismantling a single bucket tooth, you must use a special long-rod type tool to dismantle and install.
  • When digging, the front side of the cross-mounted gear pin is not subjected to the extrusion pressure of the digging material, so it can withstand a large digging force, but the spring is prone to wear out and fail when subjected to reciprocal lateral action in use under stress, thus causing the gear pin to fall off. Generally more common when the excavation force is greater than 20 tons.

Production process of bucket teeth

  • Sand Casting
    Sand casting is the lowest cost of bucket teeth, and the level of craftsmanship and quality of bucket teeth are not as good as fine casting and forging. Therefore, the price is the cheapest among all processes.
  • Precision Casting
    Precision casting: The cost is moderate, but the raw material requirement is very strict and the technology level is high. Some precision casting gears are even better than forged gears in terms of wear resistance and quality due to their composition.
    (Note: if the number of teeth, then the teeth are very cost-effective, precision casting in terms of price, quality, cost performance and wear resistance are very good)　
  • Forging Casting　　
    Forging casting: is the highest of the three processes, while the level of technology and quality of bucket teeth is also the best, so the sales price is also the most expensive, but can guarantee that the industrial level of forging casting and quality bucket teeth is the best!
  • (Note: If you have to do earthwork excavators, the frequency and demand for replacement bucket teeth is relatively small, it is recommended that you choose forged and cast bucket teeth, although the price is much higher, but the service life, production process and quality is the best)

Generally forged bucket teeth are more wear-resistant, harder, and have a service life about twice as long as cast bucket teeth, while the price is about 1.5 times higher than cast bucket teeth.

Tooth replacement cycle
The replacement cycle of bucket teeth depends on the construction environment and the degree of wear of bucket teeth, for example, if the excavator has been doing earthwork, then the degree of wear of bucket teeth is relatively small, generally about 4-5 months to replace once.

If the bucket is rock type, the frequency of replacing bucket teeth is faster, like granite is generally about a week to replace the bucket teeth, of course, this cycle is not fixed, depending on the good and bad bucket teeth, the actual operation of the degree of care to determine the frequency of replacement of bucket teeth.

Excavator bucket teeth maintenance and extend the service life of the proposal

  • Excavator drivers in the operation of the excavation angle operation should pay attention to the grasp when trying to dig, bucket teeth down perpendicular to the work surface digging, to avoid breaking bucket teeth due to excessive tilt.
  • Note that in the case of greater resistance do not swing the excavation arm left and right, which is easy to make bucket teeth and bucket teeth seat due to excessive force left and right and break, without considering the left side of the design and the correct force.
  • Excavator bucket teeth in the process of use, the bucket teeth outside the bucket teeth than the innermost bucket teeth wear 30% faster, with a period of time, to switch the bucket teeth inside and outside the position.
  • Excavator drivers to improve the utilization of the bucket teeth driving method is also very critical, excavator drivers in lifting the big arm try not to put away the bucket, the operation should pay special attention to the coordination of action. Some excavator drivers tend to exert too much force in the action of the big arm to send the small arm, so that the bucket falls on the rocks, will break the bucket teeth or crack, causing the small arm to break.
  • Tooth seat wear is also important to the service life of the excavator bucket teeth, tooth seat wear 10% after the recommended replacement of tooth seat, tooth seat and bucket teeth between the wear gap is large, so that the bucket teeth and seat fit, and the force point has changed, bucket teeth fracture due to changes in the force point.