Excavators are heavy construction equipment primarily consisting of a boom, dipper (or stick), bucket and cab on a rotating platform known as the "house". The modern excavator's house sits atop an undercarriage with tracks or wheels, being an evolution of the steam shovel (which itself evolved into the power shovel when steam was replaced by diesel and electric power). All excavation-related movement and functions of a hydraulic excavator are accomplished through the use of hydraulic fluid, with hydraulic cylinders and hydraulic motors, which replaced winches, chains, and steel ropes. Another principle change was the direction of the digging action, with modern excavators pulling their buckets toward them like a dragline rather than pushing them away to fill them the way the first powered shovels did.
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授權類型 | 尺寸 | 像素 | 格式 | 點數 | |
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進階授權 | WEL | 5000 x 3333 | JPG | 88 | |
進階授權 | PEL | 5000 x 3333 | JPG | 88 | |
進階授權 | UEL | 5000 x 3333 | JPG | 88 |
XS
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M
L
XL
MAX
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WEL
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標準授權 | 480 x 320 px | JPG | 13 點 |
標準授權 | 800 x 533 px | JPG | 15 點 |
標準授權 | 2121 x 1414 px | JPG | 18 點 |
標準授權 | 2738 x 1825 px | JPG | 20 點 |
標準授權 | 3464 x 2309 px | JPG | 22 點 |
標準授權 | 5000 x 3333 px | JPG | 23 點 |
標準授權 | 7071 x 4714 px | TIF | 39 點 |
進階授權 | 5000 x 3333 px | JPG | 88 點 |
進階授權 | 5000 x 3333 px | JPG | 88 點 |
進階授權 | 5000 x 3333 px | JPG | 88 點 |