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液壓扳手由動力頭、工作頭、液壓扳手專用泵以及高壓油管，快速接頭組成。通過高壓油管，液壓泵將動力傳輸?shù)焦ぷ黝^，驅(qū)動工作頭旋轉(zhuǎn)螺母的擰緊或松開。

The hydraulic wrench consists of the power head, the working head, the special pump of the hydraulic wrench and the high pressure oil pipe, and the quick joint. Through the high-pressure oil pipe, the hydraulic pump transfers the power to the working head and drives the screw nut of the working head to tighten or loosens.

動力頭油缸輸出力，油缸活
Power head cylinder output force, cylinder life

塞桿與傳動部分組成運動體，油缸中心到傳動部件中心這個距離是液壓扳手放大力臂。油缸出力乘以力臂，就是液壓扳手理論輸出扭矩，由于摩擦阻力存在，液壓扳手實際輸出扭矩要小于理論輸出扭矩。
The piston rod and the drive part consist of a moving body. The distance between the center of the cylinder and the center of the drive part is the arm of the hydraulic wrench. The output of the cylinder is multiplied by the force arm, which is the theoretical output torque of the hydraulic wrench. Due to the existence of frictional resistance, the actual output torque of the hydraulic wrench is less than the theoretical output torque.

液壓扳手分為兩大類：中空液壓扳手、方頭液壓扳手。方頭液壓扳手配合標準套筒使用，為通用型液壓扳手適用范圍廣;中空液壓扳手厚度較薄，特別適用于空間比較狹小的地方。適用于電力(核電、風電、水電、火電等)領(lǐng)域。
Hydraulic wrench is divided into two categories: square hollow hydraulic wrench, hydraulic wrench. The head of hydraulic wrench with standard sleeve used for a wide range of general-purpose hydraulic wrench; the thickness of the hollow hydraulic wrench is thin, especially suitable for relatively small space of the place. It is suitable for electric power (nuclear power, wind power, hydropower, thermal power and so on).

方頭液壓扳手特點：采用高科技航天材料及超高強度合金鋼制造，一體成型機身，全面加強機身強度、韌性可360°×180°旋轉(zhuǎn)的油管接頭，無使用空間限制，自由操作;扳機式鎖扣，輕松按動，可隨心所欲地將360°微調(diào)式反作用力臂定于堅固的支點上;采用精密棘輪，精度高達±3%。中空液壓扳手特點：方頭采用超高強度輕金屬，薄型設(shè)計，雙作用，高速，大轉(zhuǎn)角卡接式，互換插件，不需特殊工具，扭矩重復(fù)精度高達±3%，360°×180°的旋轉(zhuǎn)軟管接頭，適合緊湊場合方便定位，扳手件強度設(shè)計充分，整體反作用力臂，較少的活動部件，耐用，可靠，可擴展的米制、英制六角插件和套筒，可實現(xiàn)一個動力頭配備多個插件。

With hydraulic wrench features: the use of high-tech aerospace materials and ultra high strength alloy steel unibody, strengthen the body strength and toughness pipe joints 360 * 180 degrees rotation, without space restrictions, free operation; the trigger button, easily pressed, can arbitrarily be 360 degrees to fine tune reaction arm due to strong fulcrum; the precision ratchet, precision up to + 3%. Hollow hydraulic wrench features: square with ultra high strength lightweight metal, thin design, double acting, high speed, large angle clamping type, interchangeable plug-in, without special tools, torque repeat precision up to + 3%, rotary hose joint 360 * 180 DEG, suitable for compact occasions to facilitate positioning, wrench strength design fully overall, reaction arm, moving parts, less durable, reliable, scalable metric and inch six angle plug and socket, can realize a dynamic head equipped with multiple plug-ins.