Tensioners, also known as ratchet tensioners, are used to tighten wires during overhead line laying construction. When using, first loosen the steel wire rope or galvanized iron wire on the tightener and fix it on the cross arm. Use a wire clamp to clamp the wire, and then pull the special wrench. Due to the anti reversal effect of the pawl, the steel wire rope or galvanized iron wire is gradually wound around the ratchet drum to tighten the wire. Fix the tightened wire onto the insulator. Then, first release the pawl to release the steel wire rope or galvanized iron wire, then release the wire clamp, and finally wind the steel wire rope or galvanized iron wire around the drum of the ratchet. The tightener is divided into a hand pull (wrench) hoist, a ratchet tightener, and a double hook tightener. (1) Hand pulled (hand pulled) hoists are mainly used to tighten various types of cables such as power and overhead lines, and to tow and move heavy objects such as equipment. They are also used to fix large equipment and other goods during automobile transportation. There are two types of driving methods for hand pull (hand pull) hoists: hand pull and hand pull. Hand pull hoists achieve the purpose of tightening and lifting by manually pulling the ring chain. Hand pull hoists include ring chain hand pull hoists and steel wire rope hand pull hoists. Hand pull hoists use handles to pull the ring chain or steel wire rope to achieve the purpose of tightening and lifting. Hand pulled (lever) hoists can be used for lifting, towing, lowering, calibration, and other operations. If equipped with special devices such as cable clamps, not only can non linear traction operations be carried out, but suitable operating positions can be easily selected, or the load capacity of smaller tonnage machines can be multiplied. For larger tonnage loads, multiple hand pull (wrench) hoists can be used for parallel operation. (2) Ratchet wire tensioner, also known as ratchet wrench hoist, is a tool used to tighten steel strands and small cross-section wires during transmission line construction. Usually, a wire clamp is used to fix the wire first, and then a wire tensioner is used to tighten the wire to a suitable sag. (3) The double hook tightener is a tool used for tightening the stay wire, adjusting the position of equipment or equipment, replacing insulators, and other tensioning during the construction process of transmission line engineering. There are two types of double hook wire tensioners: steel and aluminum alloy. The former is heavier but allows for a large bearing capacity, with a maximum capacity of 100kN tension; The latter is lightweight and easy to carry, but the maximum load is generally not greater than 52kN. When using the tightener, first loosen the steel wire rope or galvanized iron wire on the tightener and fix it on the cross arm. Use a wire clamp to clamp the wire, and then pull the special wrench. Tightener can improve the safety of cargo transportation and lifting process