Because the use environment of hydraulic excavator is generally bad working conditions such as soil, sand and stone, crawler walking device has the advantages of strong traction and good road adaptability, so crawler walking device has been widely used.
The crawler walking device has a large contact area with the ground, which will greatly reduce the grounding specific pressure, can also walk freely on the muddy road, and will not appear the awkward situation of wheel excavator trapped in the quagmire because of the large grounding specific pressure.
When the crawler hydraulic excavator walks, the tensioning device plays a very important role. Whether the parameter design of the tensioning device is correct or not directly affects whether the whole excavator walking device can be used normally. If the parameter design of the tensioning device is small, the excavator will appear abnormal noise, jump teeth and derailment when walking. If the parameters of the tensioning device are large, there will be stagnation when walking, and the increase of internal resistance will affect the service life of the four-wheel area, and the service life of the lower frame will be affected when it is serious.