First, portable: it is divided into side-mounted and piggyback:
1 Side-mounted automatic harvester adopts hard shaft drive, mainly composed of engine, transmission system, clutch, working parts, operating device and side-mounted belt. A single-cylinder two-stroke air-cooled gasoline engine of 0.75 to 2 kilowatts and a centrifugal friction clutch are disposed on one end of the transmission shaft; the other end is equipped with a working component consisting of a speed reducer and a cutting tool. There are many types of working parts, commonly used are circular saw blades, blades or nylon filaments. During operation, the hooks on the aluminum alloy bushing of the transmission shaft are hung on the strap under the operator's shoulder, and the handle is held and the hard shaft is laterally oscillated to complete the cutting of weeds and shrubs. The machine weighs about 6-12 kilograms and the speed is about 4500-5000 rpm.
2 piggyback automatic harvesters. With the flexible shaft drive, the general structure is similar to the side-mounted brush cutter, except that the engine is back on the back of the operator, the cutting part is driven by the flexible shaft, and the engine power is generally 0.75-1.2 kilowatts. Two points are connected between the engine and the back frame and special rubber parts are provided for vibration isolation. The flexible shaft is a flexible shaft of wire wrapped in a hose to transmit torque. The hose is a threaded tube wrapped with a steel braid encased in a metal woven mesh covered with a rubber protective cover, and penetrates into the shaft with dust-proof soil and retains the lubricant on the surface of the shaft. The cut width is generally between 1.5-2 meters.
Second, walk-behind type: the weight of the machine is supported by the traveling wheel, and the machine is driven by the person to advance the machine, and the driving part is driven by the engine to perform the cutting irrigation operation. Its structure and working principle are similar to portable brush cutters.
Third, hanging: hanging behind the tractor, driven by the power output shaft rotation of the working part, suitable for large-scale irrigation operations. Mainly by the rack, saw blade, transmission, suspension and push plates and other components. During the irrigation operation, the tractor runs backwards, working at a speed of 5 km/h and can saw a bush with a diameter of 10 cm.
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