The track shoes for undercarriage parts of construction machinery

The track shoes for undercarriage parts of construction machinery

The crawler undercarriage parts manufacturer will give you a detailed explanation, where to buy the crawler undercarriage, welcome to inquire: hongda01@qzhdm.com Quanzhou Jinjia Machinery Co., Ltd, the crawler undercarriage is affordable, quality guaranteed, and supported by various types of OEMs.

Track shoe is one of the undercarriage parts of construction machinery and a kind of vulnerable part of the construction machinery used. Commonly used in construction machinery such as excavators, bulldozers, crawler cranes, and pavers.

The structure of the track shoe

Commonly used track shoes are classified according to the grounding shape, there are three types of single rib, three ribs and flat bottom, and some of them also use triangular track shoes. Single-reinforced track shoes are mainly used for bulldozers and tractors, because this type of machinery requires the track shoes to have a higher traction capacity when working. However, it is rarely used on excavators. This type of track shoe is only used when the excavator is equipped with a drill frame or requires a large horizontal thrust. A higher traction is required when turning from a child, so a higher crawler bar (ie, crawler spur) will squeeze away the soil (or ground) between the crawler bars, thereby affecting the mobility of the excavator.

Steel track shoes can be divided into: excavator plates and bulldozer plates. These two are the most commonly used, using section steel as the raw material. Then there is the wet floor used by bulldozers, commonly known as “triangular plates”, which are cast plates. Another type of casting slab is used on crawler cranes. The weight of this slab is as small as tens of kilograms, and as many as hundreds of kilograms.

The purpose of track shoes

Most excavators use three-reinforced track shoes, and a few use flat bottom track shoes. When designing a three-reinforced track shoe, first find the ground contact pressure and the meshing soil capacity between the track reinforcement and the ground to ensure the necessary adhesion; secondly, the track shoe should have a higher bending strength and abrasion resistance. Three-rib track shoes generally have two mud cleaning holes. When the track shoe rotates around the drive wheel/drive sprocket, the silt on the chain track section can be automatically cleaned with the help 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 track section.

For crawler walking devices used in marshes or farmland, in order to protect the ground surface and reduce turning resistance, it is more appropriate to use extended crawlers and flat bottom crawlers . In order to ensure that when the track chain is at any position (including grounding, rotation around the driving sprocket and guide wheel/idler, and upper suspension position), the adjacent track shoes will not be caught in the middle of the stone and cause excessive stress. The distance is adjusted very accurately, and the lap lip of the appropriate shape should be designed. The function of the lap lip is to make the track shoes close to each other, forming a belt that connects end to end. The 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 driving sprocket and the guide wheel/idler. In this way, the running uniformity is good, the wear of the crawler chain is low, and the driving efficiency is high when walking. But the minimum pitch value should be determined according to the machine weight and the number of rows of the crawler chain. The hole spacing on the two rows of chain rails for installing track shoes should generally be larger in order to replace track shoes with different ground pressures. The walking device used in the swamp requires a very wide track shoe and track surface. This kind of ultra-wide track shoe sometimes has a high bending stress. For example, when the excavator is working on the ground mixed with residual tree roots, because the heavy part of the machine falls on a certain track shoe supported by the roots, the track shoe produces a very high bending stress, which affects the track and the life of the board. In order to prevent damage and bending of the track shoe, the section coefficient and bending strength must be improved. To increase the section coefficient, you must increase the height of the track bars, but this will significantly increase the turning resistance and affect the maneuverability of the excavator. Therefore, steel-rolled hollow track shoes should be used for walking devices with a width of more than 700 mm for marshland use. Most of the two ends of the crawler shoes used in marshland are made into slope angles, so that it is convenient to protect the surface of the ground, reduce 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 track shoes with a width of more than 800 mm are mainly used in swamps and should not be used in general occasions. Excavators with widened and elongated crawler walking devices are particularly suitable for pipeline engineering.

Processing methods

The processing technology of the track shoe of the profile is generally: the use of profile cutting, drilling (punching), heat treatment, straightening, painting and other processes; the track of the bulldozer is single-reinforced, and the general paint color is yellow; the excavator board is general It is three-stranded and the paint color is black. The material purchased for the profile is generally 25MnB, and the final heat treatment hardness of the material is HB364~444.

QUANZHOU JINJIA MACHINERY CO., LTD., the professional manufacturer since 1990. Any questions on undercarriage parts/crawler undercarriage, i.e. idler, sprocket, upper roller, bottom roller, track link assy, track shoes, track adjuster, spring, etc, pls welcome to contact with us at hongda01@qzhdm.com or +8615359560533.