Loader knowledge profile:
First, the use of loaders:
The loader is mainly used for shoveling, loading, unloading, earth moving, and stone materials, as well as light shoveling of rock and hard soil. If you change the different working devices, you can also complete the tasks of dozing, lifting, and loading and unloading other materials. In road construction, it is mainly used for the filling and excavation of roadbed works, and for aggregate and loading of asphalt and cement concrete stockyards.
Second, the advantages of the loader: It has the advantages of fast operation speed, good maneuverability, and easy operation, so it has developed rapidly and has become the main machinery in earth and stone construction.
Second, the classification of loaders: commonly used single bucket loader, according to the engine power, transmission form, structure of the traveling system, loading methods of classification.
1, engine power:
1 Power is less than 74kw for small loaders.
2 power at 74 ~ 147kw for the medium-sized loader
3 power at 147 ~ 515kw for a large loader
4 Power is greater than 515kw for extra large loaders
2. Transmission form:
1 Hydraulic-mechanical transmission, small shock and vibration, long service life of transmission parts, convenient operation, automatic adjustment between speed and external load, generally used in medium and large loaders;
2hydraulic power transmission: It can be steplessly speed-adjustable and easy to operate, but its startability is poor. It is generally adopted only on small loaders;
3 Electric power transmission: Stepless speed regulation, reliable operation, simple maintenance, high cost, generally adopted on large loaders.
3, walking structure:
1 Tyre type: light weight, high speed, flexible, high efficiency, difficult to damage the road, ground pressure, pass through poor, but widely used;
2 Crawler: Smaller than the ground pressure, good passability, low center of gravity, good stability, strong adhesion, large traction, greater than the cutting force, low speed, relatively poor flexibility, high cost, easy to damage the road when walking.
4, loading and unloading methods:
1 front unloading: simple structure, reliable work, good vision, suitable for a variety of job sites, a wide range of applications;
2 Rotary type: The working device is installed on the turntable that can rotate 360°. The side unloading does not need to change the head, but the work efficiency is high, but the structure is complex, the quality is high, the cost is high, and the stability of the side is poor, and it is suitable for a relatively small and small venue.
3 rear unloading type: front-loading, back-end unloading, high operating efficiency, poor job security.
