Because the walking device has both the functions of support and operation of the hydraulic excavator, therefore, the walking device of the hydraulic excavator should try to meet the following requirements:
(1) There should be a large driving force, so that the excavator has good passing performance, climbing performance and steering performance when walking on wet or soft unequal ground.
(2) Without increasing the height of the walking device, the excavator has a larger ground clearance to improve its off-road performance on uneven ground.
(3) The walking device has a large support area or a small grounding specific pressure to improve the stability of the excavator
4) The excavator does not slide down and overspeed when it descends on the slope, so as to improve the safety of the excavator
5) The external dimensions of the walking device should meet the requirements of road transportation.The walking device of the hydraulic excavator can be divided into two types of crawler type and tire type according to the structure.The characteristics of the crawler type walking device are that the driving force is large (usually each crawler The driving force can reach 35%~45% of the machine weight), and the contact pressure is small (40~150kPa), so the off-road performance and stability are good, and the climbing ability is large (generally 50%~80%, the maximum can reach 100%), with small turning radius and good flexibility. Crawler walking devices are more commonly used in hydraulic excavation. Crawler walking devices have high manufacturing costs, low running speed, high power consumption during operation and steering, and fast wear of parts. Therefore, excavators need to rely on other transportation vehicles for long-distance operation.
Compared with the crawler type, the tire-type walking device has the advantages of fast running speed and good maneuverability, and the tire does not damage the road surface during operation, so it is very popular in urban construction. The disadvantage is that the grounding pressure is large, the climbing ability is small, and special outriggers are needed to support the excavation to ensure the stability and safety of the excavator.
