Unexpectedly, such a chainsaw!

by:Jiali     2020-06-13
Introduction of Chainsaw Chainsaw, short for 'petrol chain saw' or 'petrol power saw'. Power saw for logging and timber production. The sawing mechanism is a saw chain. The power part is a gasoline engine. Easy to carry and easy to operate. But maintenance and repair are more complicated. We usually say that the chain saw accessories generally include: crankshaft, saw chain, piston, air filter, cylinder, crankcase, muffler, high pressure bag, magnetic flywheel and so on. The new chain saw chain includes left and right cutting teeth, driving pieces, connecting pieces and rivets. There are two connecting holes in the lower part of the left incisor, right incisor, drive and connection. A complete unit of the saw chain is: the left cutting tooth and the connecting piece are sandwiched by two rivets, one left and one right driving piece; the right cutting tooth and the other connecting piece are two left rivets, and the other one is left and right The two driving pieces are sandwiched in the middle; the other two connecting pieces are sandwiched between the left and the right of the two driving pieces by two rivets at the driving piece connecting holes in the upper two assemblies, and the assembly is connected. Several saw chain units form a closed integrated saw chain. The angle formed between the tangent surface of the cutting blade and the side cutting surface is 87°-90°; the intersection of the tangent surface of the cutting blade and the side cutting surface gradually forms a small-angle arc surface from the middle to the tail; the tangent surface of the cutting blade The angle formed by the side line and the side cutting side line is 50°-52°. The saw chain has the advantages of high efficiency, low wear, low noise and convenient material selection. Overview of chain saw: In 1914, Germany made the world's first chain saw, with a power of about 3 kilowatts and a weight of 80 kilograms, which was carried by two people. In the early 1950s, with the widespread use of small internal combustion engines, the Soviet Union, the United States, the Federal Republic of Germany, Sweden, Japan and other countries began mass production of single-handed chain saws. By the 1960s, due to the development of light alloy die-casting technology, the chain saw manufacturing industry With greater development. China was introduced in 1956 and production began in 1957. Classification:  According to the type of saw blade, it can be divided into two types: high chain saw and short chain saw (see picture). The high-weight chain saw has an even weight distribution on both arms, is easy to carry, and does not require a large bend in the operation, and the maintenance of the tool is simple; the low-profile chain saw has a compact structure, light weight, and small vibration during operation, which is suitable for mountain forest areas. Comprehensive operations such as logging, pruning, and timber making. According to the engine power, it can be divided into large, medium, small and micro: large ones above 4.4 kilowatts; medium ones from 3 to 4 kilowatts; small ones from 1 to 2 kilowatts; small ones below 1.5 kilowatts. The chain saw is a hand-held wood cutting machine powered by a gasoline engine and a saw chain as a cutting component. In forestry production, it is widely used in logging, branching, and timber production. Basic structure: generally consists of engine, transmission mechanism, sawing mechanism, etc. During operation, the power drives the saw chain through the transmission mechanism to make the saw chain move continuously along the guide plate to cut the wood. Engine It is generally a single-cylinder air-cooled two-stroke high-speed gasoline engine. In order to adapt to the operation of the chain saw in different sawing directions and different positions, the pump membrane carburetor with an oil delivery pump is used to drive the diaphragm pump oil using the pressure pulsation in the crankcase, so that the engine can supply oil normally at any position . In addition, new structures such as transistor non-contact magneto ignition system and check valve intake system are increasingly widely used, thereby improving the performance of the engine. 2. Transmission mechanism Including centrifugal friction clutch and reducer. The reducer generally uses a conical gear reducer (only for high-hand saws) to facilitate the horizontal and vertical adjustment of the sawing mechanism relative to the body to meet the needs of different sawing directions during logging and timber production. 3. Sawmill mechanism It is the working part of chain saw, including driving sprocket, saw chain, guide plate, saw chain tensioning device and wood inserting teeth. The drive sprocket rotates under the drive of the engine power, and then drives the saw chain to move along the guide plate to perform the cutting operation. There are two types of saw chains: straight tooth type and angle steel type (universal type). Straight tooth type saw chain is suitable for transversal wood; angle steel type saw chain can cross-cut or obliquely cut wood, which is easy to manufacture and relatively easy to file. Straight tooth saw chain is simple, and it is a widely used saw chain type. The wood-insertion teeth are the supporting points of the chain saw when sawing wood. It applies part of the weight of the chain saw and the reaction force of the saw chain when cutting the wood to the wood itself, thereby reducing the labor intensity of the operator. For easy operation, the chain saw is also provided with a manipulation device including a saw handle.
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