Lawn mower :
Grass harvesting machinery that cuts grass or other crops that can be made into hay and lays it on the ground.
There are two types of reciprocating and rotating.
Reciprocating lawn mowers:
The grass is cut by the relative shearing motion of the moving and stationary knives on the cutter. Its characteristics are that the stubble is neatly cut, and the power required per unit of cutting width is small; but it has poor adaptability to different growth states of forage grass and is easy to block. It is suitable for flat natural grassland and artificial grassland with general yield. Due to the large vibration of the cutter during operation, the improvement of the operation speed is limited. The cutting speed of the moving knife is generally lower than 3 meters per second, and the forward speed of the operation is generally 6 to 8 kilometers per hour.
Tractor Mounted Lawn Mowers:
The structure is simple, light and flexible. There are three types of front-mounted, side-mounted and rear-mounted, and rear-mounted lawn mowers are the most widely used. The reciprocating lawn mower consists of main components such as cutter, cutter transmission, cutter lifting device, safety device and grass blocking device. The working principle and construction of the cutter are basically the same as those of the grain harvesting machinery. There are two types of blades: smooth and toothed. Generally, a light-edged moving blade is used. The cutter transmission device is also similar to the grain harvester, mostly using an offset crank link mechanism and a swing ring mechanism. Due to the high growth density and high moisture content of the forage, the average speed of the knife is higher than that of the grain harvester, generally 1.6 to 2.0 m/s. The cutter lifting device is generally operated by a hydraulic system, which is quick and convenient to lift, and can ensure the adaptability of the cutter to complex ground. The safety device is mainly to ensure the safety of the transmission device and the cutter. For lawn mowers with higher operating speeds, decoupling safety devices are generally used. When the resistance of the cutter is too large, the safety device is automatically disengaged, the cutter swings backward, and the power of the cutter is cut off at the same time. The cutter transmission device of some lawn mowers adopts wooden connecting rod or belt transmission mode. When the load is overloaded, the connecting rod is broken or the belt slips to protect other transmission parts and cutters from damage. The grass blocking device is usually a grass blocking plate installed at both ends or the outer end of the cutter. Its function is to move the cut grass to the middle of the cutter for a certain distance, leaving a passage for the next stroke of the tractor wheel to pass through, avoiding or reducing. Crushing of cut grass.
Rotary lawn mower:
The grass is cut with blade impact on a high-speed rotating cutterhead. The cutting speed (circumferential speed at the root of the blade edge) is as high as 60 to 90 m/s. The work is stable, and the forward speed of the operation can reach more than 15 kilometers per hour. It is characterized by strong adaptability to forage grass and is suitable for high-yield grassland, but the cutting is not neat enough, there are many heavy cuttings, and the power required per unit of cutting width is large.
Rotary lawn mower:
Lawn Mower, Rotary Lawn Mower Category:
There are two types of drum type and rotary type: ① The transmission device of the drum type lawn mower is located above the cutter, so it is also called the upper transmission rotary lawn mower. A drum mower is generally equipped with 1 to 4 vertical cylindrical or conical drums in parallel. A cutter head with 2 to 6 blades hinged is installed under each drum, and the rotation trajectories of the blades on the adjacent cutter heads have a certain overlap to avoid missed cutting. The rollers are driven by belts or bevel gears, and the two adjacent rollers rotate relative to each other, and the cut grass is laid back into neat small grass strips under the transfer of a pair of rollers. It can meet the requirements of low cutting, but the structure is not compact enough. ② The transmission device of the rotary lawn mower is located below the cutter head, so it is also called a lower transmission rotary lawn mower. Generally, 4 to 6 cutter heads are installed side by side on the cutter beam of the rotary lawn mower. Each cutter head is hinged with 2 to 6 blades. The configurations of the blades on the adjacent cutter heads are staggered, and the rotation trajectories of the blades have a certain amount of overlap. The cutter head is generally driven by gears, and the rotation of the adjacent cutter head is opposite. Compact structure, stable and reliable transmission. However, the position of the cutter head is higher due to the transmission device below. In order to ensure low cutting and reduce heavy cutting, the cutter head is usually inclined forward at a certain angle. The hinged blade on the rotary lawn mower cutter head maintains its cutting state under the action of centrifugal force when the cutter head rotates at high speed. When the resistance is too large or encounters obstacles, the blade swings back to avoid damage. When one edge of the blade is worn, it can be used on the other side. Changing blades is also easier than with reciprocating mowers. On the rotary lawn mower, in addition to the safety device similar to that of the reciprocating lawn mower, a protective cover is added above the cutter to ensure personal safety. Rotary mowers rely on blade impact on high-speed rotating decks to cut grass. The cutting speed (circumferential speed at the root of the blade edge) is as high as 60 to 90 m/s. The work is stable, and the forward speed of the operation can reach more than 15 kilometers per hour. It is characterized by strong adaptability to forage grass and is suitable for high-yield grassland, but the cutting is not neat enough, there are many heavy cuttings, and the power required per unit of cutting width is large.
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