According to different classification standards, lawn mowers can be divided into the following categories:
1. According to the movement: intelligent semi-automatic towing type, rear push type, riding type, tractor suspension type.
2. According to the power: human and animal power drive, engine drive, electric drive, solar power drive.
3. According to the mode: roller type, rotary knife type, side hanging type, swing knife type.
4. According to the requirements: flat type, half waist type, truncated type.
Handheld rotary lawn mowers are generally equipped with knifeless cutting discs, using high-strength nylon ropes as forage cutting parts, flexible structure, not afraid of hitting rigid obstacles, safer to use, and easy to replace.
The working mode of the lawn mower is reciprocating and rotary. Its high mowing efficiency greatly saves time, and realizes the functions of green environmental protection and beautification of the environment. It is simple, convenient and efficient to operate, so it is widely used. The machine is small and suitable for small and medium-sized lawns. When using a lawn mower, the stubble height after mowing should be determined according to the requirements, which is very convenient to use.
When mowing, you can only mow horizontally along the slope, not along the slope. Modern mowers are more convenient to operate.
Hanging type
In terms of form, there are two types of hanging mowers: hanging on the side and carrying on the back. In comparison, the side-hanging type is lighter, more durable and more efficient.
Side-hanging mower
Reasons for durability:
(1) In theory, using roughly the same engine and achieving the same function, the more complex the structure, the more factors that may cause failure. The back-carrying type has a more complex structure, so it is easy to have problems. In actual use, the back-carrying type is prone to problems.
(2) In reality, the domestic brush cutter market is basically a professional market, which requires durable machines. Therefore, there are basically no back-carrying types in the domestic market, and almost all of them are side-hanging types.
Hanging mower
Simple structure, light weight, and maneuverable. There are three types: front-hanging type, side-hanging type and rear-hanging type. The rear-hanging type is the most widely used. The reciprocating mower consists of the main components such as the cutter, the cutter transmission device, the cutter lifting device, the safety device and the grass retaining device. The working principle and structure of the cutter are basically the same as those of the grain harvester.
The blades used are smooth blade and toothed blade. Generally, smooth blade moving blade is used. The cutter transmission device is also similar to that of the grain harvester, and mostly adopts offset crank connecting rod mechanism and swing ring mechanism. Due to the high growth density and high moisture content of forage grass, the average speed of the moving knife is higher than that of the grain harvester, generally 1.6-2.0 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.
Reciprocating
The reciprocating mower cuts the grass by the relative shearing movement of the moving knife and the fixed knife on the cutter. It is characterized by neat stubble cutting and low power required per unit cutting width; but it has poor adaptability to different growth states of forage grass and is easy to clog. It is suitable for flat natural grassland and artificial grassland with general yield. Because the cutter vibrates greatly during operation, the increase in operating speed is limited. The cutting speed of the moving knife is generally less than 3 m/s, and the forward speed of the operation is generally 6-8 km/h.
Rotary
Rotary mowers, the blades on the high-speed rotating cutter disc impact and cut the grass at a cutting speed of up to 60-90 m/s (circumferential speed at the root of the blade edge). The operation is stable and the forward speed can reach more than 15 km/h. The choice of blades for mowers is very important, which means the quality of the mower. When using a mower to weed, the effect is best when the grass grows to 10-13 cm. If the grass grows too high, it should be done in two steps. First cut the upper part, then cut the lower part. When using a mower, you should hold the handle with both hands and keep a certain inclination to the side of the fruit tree so that the cut weeds fall to the side of the fruit tree as much as possible. Open the medium-speed throttle and move forward at a constant speed to save fuel. When the resistance is too large or encounters an obstacle, the blade will swing back immediately to avoid damage. After the blade on one side is worn, it can be used on the other side. Replacing the blade is also more convenient than reciprocating mowers. In addition to the safety devices similar to those of reciprocating mowers, a protective cover is also installed above the cutter to ensure personal safety.
Note: When mowing, the rotary mower relies on the high-speed rotation of the blade to cut the grass. If the linear speed of the blade tip is not enough, the mowing effect is not good. Therefore, when mowing, use a large throttle and high speed. In addition, the carburetor and automatic speed control device of the mower make it have low fuel consumption when there is no load at a large throttle. Only when it is loaded, its speed will reach 2800r.p.m from 3400r.p.m at no load. Therefore, there is no need to use a small throttle just to save fuel, and the mowing effect is not good at the same time.
Its characteristics are strong adaptability to forage grass and suitable for high-yield pastures, but the cutting is not neat, there are more heavy cuts, and the power required for unit cutting width is large. There are two types: drum type and turntable type:
Drum mower
The transmission device of the drum mower is located above the cutter, so it is also called an upper drive rotary mower. A drum mower is generally equipped with 1 to 4 vertical cylindrical or conical drums in parallel. A knife disc with 2 to 6 blades is installed under each drum. The rotation tracks of the blades on adjacent knife discs have a certain overlap to avoid missing cuts. The drum is driven by a belt or bevel gear. The two adjacent drums rotate relative to each other. The cut grass is laid backward into neat small grass strips under the drive of a pair of drums. It can meet the requirements of low cutting, but the structure is not compact enough.
Turntable mower
The transmission device of the rotary mower is located below the knife disc, but the knife disc is located higher because of the transmission device below. In order to ensure low cutting and reduce heavy cutting, the knife disc is usually tilted forward at a certain angle. When the resistance is too large or encounters an obstacle, the blade swings back to ensure personal safety. There are also blades that are hinged to special nylon ropes and cut grass by centrifugal force. The blades on adjacent blades are arranged in an interlaced manner, and the blades' rotation trajectories overlap to a certain extent. The blades are generally driven by gears, and the rotation directions of adjacent blades are opposite. The structure is compact, and the transmission is stable and reliable.
