Users of excavators and loaders must have met the situation of replacing bucket teeth. We must be curious about the function of bucket teeth. What kind of bucket teeth do we want to buy to replace bucket teeth? Today we will tell you about those teeth in the order.
Bucket tooth of excavator bucket
The structure and function of the bucket teeth
The bucket tooth of the excavator is the main vulnerable part of the excavator. It is similar to the human tooth. It is composed of the tooth and the tooth tip. The two is connected by the pin shaft, because the failure part of the bucket tooth is the tip of the tooth, so long as it is replaced with the tip.
The structure of the bucket teeth and the bucket
Now excavator bucket teeth generally have two structural forms, namely direct and horizontal. The direct installation means that the pin shaft is installed vertically on the front side of the digging bucket tooth, and the transverse type means that the pin shaft is parallel to the front side of the digging bucket tooth.
Straight mounted bucket teeth and cross mounted bucket teeth
For example, the gear pin is directly mounted: this method is more convenient to disassemble, directly smashed from above, and the operation space is large. When excavating, the straight gear pin will be pressed by the excavated material. If the excavating force is large, the tightening force of the spring spring can not meet the requirements and easily leads to the drop of the tooth pin, so this kind of structure is easy to disassemble, and it is usually used on the excavator with smaller excavator and lower tonnage.
For example, it is not too convenient to disassemble, the side operation space is small, and the force is more difficult. When disassembling single bucket teeth, the special long rod tool must be used in order to disassemble and assemble in sequence. When excavating, the front pin of the transverse pin will not be squeezed by the squeezing pressure of the excavated material, which can bear the greater digging force, but the spring is easily worn and invalid when it is subjected to the reciprocating lateral force in use, thus causing the tooth pin to fall off. This installation method is generally more common when digging force is more than 20 tons.
Left: general tool bucket tooth, right: special tool bucket tooth.
The bucket tooth of the excavator is classified according to its use environment: it can be divided into rock teeth (for iron ore, stone mine, etc.), earthwork (used in soil, sand, etc.), and conical teeth (used in coal mines). But the shapes of bucket teeth of different brands of excavators also have their own characteristics.
Classification of bucket teeth by use environment
Kobelco brand Bucket Style
The function of the bucket teeth:
1, to protect the bucket as a whole, the bucket tooth is a wastage, because the bucket is worn out when it is shoveling the earth and stone, and the bucket teeth will protect the bucket.
2. To make the operation more delicate, we open the excavator to paint the dragon on the ground. Imagine that the delicate operation can not be achieved without the reference of bucket teeth.
3. Easy to dig and shovel. Bucket teeth are tapered, there is a blank in the middle, the whole bucket force, the action surface is small, the pressure is bigger, more easily shovel, dig up things...
4, after digging hard things, the buffer effect on the whole machine.
Two. Selection of bucket teeth (difference between casting bucket teeth and forging bucket teeth)
Although the bucket tooth is a small piece of excavator, the price is not expensive, but it can not be made. The bucket teeth are generally different from the cast bucket teeth and the forging bucket teeth. The general forging bucket teeth are more wear-resistant and more hardness, and the service life is about 2 times of the cast bucket teeth, and the price is about 1.5 times as much as the cast bucket teeth.
What is casting: casting liquid metal into a casting cavity adapted to the shape of a part, when it is cooled and solidified, the method of obtaining parts or blanks is called casting. In rural areas, we must have seen aluminum casting aluminum pots and aluminum pots.
The casting produced by this process is easy to form trachoma due to porosity. Its mechanical properties, wear resistance and service life are lower than those of forgings. Cast bucket teeth are also cheaper. In addition to texture, more liquid metal will enter the side of the cast bucket teeth when the liquid metal is poured.
Molding of cast bucket teeth and characteristics of cast bucket teeth
What is forging: the forging bucket teeth use the forging press to exert pressure on the special metal billet, extrusion molding at high temperature, refining the grain in the forgings to produce plastic deformation to obtain certain mechanical properties. After forging, the metal can improve its structure, so that the forging bucket teeth have good mechanics. Performance, more wear-resistant, longer service life.
The hardness and wear resistance of the forging bucket teeth are better
If you are interested in the heat treatment process of forging and casting, and what metals are added to improve the strength and hardness of bucket teeth, you are welcome to read the next article.
Selection of bucket teeth:
When choosing bucket teeth of excavators, the first thing to see is what working environment to use bucket teeth, to determine what type of bucket teeth.
First of all, the general excavation, loose sand, etc., to use flat mouth bucket teeth. Secondly, dug hard rock with RC type bucket teeth, dig block coal seam generally use TL type bucket teeth, in addition in the actual operation process general people like general RC bucket teeth, Shunde machinery suggested you do not use RC type bucket teeth in general conditions, the best is the flat mouth bucket teeth, because RC bucket teeth after a period of wear, after a period of wear, after the front wear, and increase after the front wear, the increase after wear, after the front wear, after the wear, the increase after the front wear, after the wear, the increase after wear, after the front wear, after the wear, the increase after the front, the increase after the front wear after a period of front, after the wear, and increase after the front wear, after the front wear, after wear, the front wear, after wear, increased after the front. Excavation resistance, waste of power, and flat bucket teeth in the process of wear and tear always maintain a sharp surface, reduce excavation resistance, save fuel.
Finally, recommendations for maintenance and extension of service life of excavator bucket teeth.
1. The bucket teeth of excavator wear out 30% faster than the innermost in the course of using. After a period of time, the bucket teeth should be changed inside and outside.
2, excavator driver in operation to excavate the angle operation should pay attention, try to excavate as much as possible, the bucket teeth under the excavation perpendicular to the working face, to avoid the big dip and break the bucket teeth.
3, pay attention to the wobble mining arm in the case of large resistance, so it is easy to break the bucket teeth and the tooth seat because the force is too large, and the design of the left and right forces is not considered.
4. The wear of the tooth seat is also important to the life of the bucket teeth of the excavator. After the tooth seat is worn out, it is suggested to replace the tooth seat, and there is a large gap between the large worn teeth and the bucket teeth, so that the matching of the bucket teeth and the tooth seat and the force point have changed, and the bucket teeth are broken because of the change of the strength point.
5. The driving method of the excavator driver is also very important to improve the utilization ratio of the bucket teeth. The excavator driver should try not to collect the bucket as much as possible while lifting the arm. The operation should pay special attention to the coordination of the action. Some excavator drivers often throw the dug over the rock in the movements of the magnifying arm and the small arm, which will break the bucket or crack and break the arms.
