A hydraulic wrench is a tool for tightening bolts using hydraulic pressure. It controls output torque within a certain range by action of high pressure oil, so that bolt tightness is guaranteed. Compared with traditional manual wrench and electric wrench, hydraulic wrench has following features:
1. Efficiency: The hydraulic wrench is highly efficient in tightening bolts. It can perform fixing work quickly and without excessive fatigue.
2. Accuracy: The hydraulic wrench can achieve different torque according to different working requirement. Its torque accuracy is high and error range is small.
3. Light weight: The hydraulic tong is made of lightweight high strength materials, light in weight, convenient to carry and use.
4. Safety: when using a hydraulic tong, it has a safety device. Once torque reaches set value, it will automatically stop working, avoiding damage caused by overtightening bolts.
When buying a hydraulic tong, you should pay attention to following points:
1. Power: The power of hydraulic tong is different for different working requirements, and must be selected according to specific working requirements.
2. Pressure: The working pressure of hydraulic tong directly affects output torque. The greater pressure, greater output torque, but it should be noted that excessive pressure will increase cost of using hydraulic tong.
3. Torque range: The torque range of hydraulic tong must match size of bolts being tightened.
4. Brand and Quality: The brand and quality of a hydraulic tong directly affects its life and performance. It is necessary to choose a well-known brand and a hydraulic tong with a guarantee of high quality.
Then, according to type of hydraulic tong, it is usually divided into single-acting hydraulic tong and double-acting hydraulic tong. Among them, single-acting hydraulic tong can only operate in one direction, while double-acting hydraulic tong can perform both forward and reverse operation. When choosing, you should choose according to requirements of job and specific circumstances.