Track shoe structure and use
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The track shoe is one of the chassis parts of construction machinery, and is a wearing part of the construction machinery used. Commonly used in excavators, bulldozers, crawler cranes, pavers and other construction machinery.
The structure of the track shoe
Commonly used track shoes are divided into three types according to the grounding shape, including single rib, three rib and flat bottom, and some also use triangular track shoes. Single-reinforced track shoes are mainly used for bulldozers and tractors, because the track shoes are required to have high traction capacity when such machinery works. However, it is rarely used on excavators. This kind of track shoe is only used when a drill frame is installed on the excavator or when a large horizontal thrust is required. High traction force is required when turning by the sub, so the higher tread bars (ie stabs) will squeeze away the soil (or ground) between the tread bars, thus affecting the mobility of the excavator.
Steel track shoes can be divided into: excavator shoes, bulldozer shoes, these two are the most commonly used, with steel as the raw material. Then there is the wet floor used by the bulldozer, commonly known as “triangle plate”, which is a cast plate. Another type of cast plate is used on crawler cranes. The weight of this plate can range from tens of kilograms to hundreds of kilograms.
The use of track shoes
Most excavators use three-rib track shoes, and a few use flat-bottom track shoes. When designing a three-rib track shoe, firstly, the ground specific pressure and the meshing soil capacity between the track bar and the ground are required to ensure the necessary adhesion; secondly, the track shoe should have high flexural strength and wear resistance. The three-rib track shoe generally has two mud-clearing holes. When the track shoe rotates around the drive wheel, the mud on the chain link can be automatically removed by means of the gear teeth, so the mud removal hole should be located between the two screw holes that fix the track shoe on the chain link.
In order to protect the ground surface and reduce the turning resistance of the crawler walking device used in the swamp or farmland, it is more appropriate to use the extended crawler and the flat bottom crawler [1]. In order to ensure that when the crawler chain is in any position (including grounding, rotating around the driving wheel and guide wheel, and the upper suspension position), the stones will not be caught between the adjacent two crawler shoes and cause excessive stress. The distance is adjusted accurately and the lap lip of appropriate shape should be designed. The function of the lap lip is to make the track shoes abut against each other, forming a belt that connects end to end.
Track shoes should be installed sequentially in the same direction. The smaller the pitch of the track, the smaller the rise of the track chain when it runs between the drive wheel and the guide wheel. In this way, the running uniformity is good, the wear of the crawler chain is low, and the driving efficiency is high when walking. However, the minimum pitch value should be determined according to the machine weight and the number of rows of the crawler chain. Generally, the hole spacing on the two rows of chain rails where the track shoes are installed should be larger, so that the track shoes with different grounding specific pressures can be replaced. The walking device used in the swamp requires very wide track shoes and track surfaces, and such ultra-wide track shoes sometimes have high bending stress.
For example, when the excavator is working on the ground mixed with residual tree roots, a part of the machine weight falls on a track shoe supported by tree roots, so that the track shoe has a very high bending stress, which affects the track. life of the board. In order to prevent the damage and bending of the track shoes, the section coefficient and bending strength must be increased. To increase the section coefficient, it is necessary to increase the height of the tread bars, but this will significantly increase the turning resistance and affect the mobility of the excavator.
Therefore, steel rolled hollow track shoes should be used for walking devices with a width of more than 700 mm for swamps. Most of the two ends of the track shoes used in swamps are made of slope angles, which is convenient to protect the ground surface, reduce the turning resistance and subsidence, and when walking on hard ground, the shortening of the supporting arm can reduce the bending moment carried by the edge. .
Excavators with a track shoe width exceeding 800 mm are mainly used in swamps and should not be used in general occasions. The excavator with widened and extended crawler walking device is especially suitable for pipeline engineering.
Post time: Aug-26-2022
