Hydraulic Excavator Crawler Truck Construction Vehicle Overview
– 1:87 Scale Die Cast Metal
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Excavators (Hydraulic Excavators) are heavy construction equipment consisting of a boom, dipper (or stick), bucket and cab on a rotating platform known as the “house”. The house sits atop an undercarriage with tracks or wheels. They are a natural progression from the steam shovels and often mistakenly called power shovels. All movement and functions of a hydraulic excavator are accomplished through the use of hydraulic fluid, with hydraulic cylinders and hydraulic motors. Due to the linear actuation of hydraulic cylinders, their mode of operation is fundamentally different from cable-operated excavators which use winches and steel ropes to accomplish the movements.
The hydraulic excavator operates on different levels. The first is the arm of the vehicle. The arm is comprised of two hydraulic cylinders, a bucket and a boom, which is on the upper part of the arm. The arm moves in two parts just like a human arm would: at the wrist and the elbow.
Inside of the hydraulic cylinder is a rod, which is the inner part of the cylinder, and a piston, which is at the end of the cylinder and enables the arm to move with the help of oil. If there were no oil in the cylinder, the piston would drop to the bottom, but because of the nature of oil, its volume always stays the same.
Oil is pumped through the end of the piston and in turn pushes the rod through the cylinder, thus creating movement of one or both parts of the arm. By controlling the amount of oil is pumped through the valve, the accuracy of the arm can be easily manipulated. This movement is activated by the use of control valves that are positioned inside the cab where the driver seat is.
||Compact excavator, Dragline excavator, Long reach excavator, Amphibious excavator, Power shovel, Steam shovel, Suction excavator, Walking Excavator, Bucket-wheel excavator
||Bucket, breaker, a grapple or an auger,
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