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A wheel loader, also known as a front-end loader, is a type of heavy machinery used in construction, mining, and other industries to move and transport materials. It is equipped with a large front bucket that can be raised and lowered to scoop up and carry materials such as dirt, gravel, sand, and rocks. The machine is designed to work on various types of terrain and is operated by an operator sitting in an enclosed cab.

The structure of a wheel-type loader generally includes the following components:

• Engine: A powerful internal combustion engine that provides the power to drive the machine and operate the bucket.
• Lift arms: A set of hydraulic arms that can be raised and lowered to control the height and angle of the bucket.
• Bucket: A large metal container attached to the lift arms that can be used to scoop up and transport materials.
• Tires: Large, heavy-duty tires that provide traction and stability to the machine on various types of terrain.
• Operator cab: An enclosed compartment located at the front of the machine where the operator sits and controls the machine.

The working principle of a wheel-type loader is as follows:

1. The machine is started and the operator enters the cab.
2. The engine provides power to the hydraulic system, which controls the lift arms and bucket.
3. The operator drives the machine to the area where materials need to be loaded or transported.
4. The operator positions the bucket over the pile of materials and lowers the lift arms to scoop up the materials.
5. The operator raises the lift arms and the bucket to transport the materials to the desired location.
6. The operator empties the contents of the bucket by tilting it forward or backward.
7. The process is repeated as needed to complete the task at hand.