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How does a hydraulic torque wrench work?

hydraulic torque wrench

Hydraulic torque wrenches are widely used in construction, maintenance, and emergency repairs in petroleum, chemical, electric power, mining, metallurgy, shipbuilding, cement, heavy equipment manufacturing, and other industries. According to relevant statistics, 50% of equipment failures are caused by bolting failure, and reports of equipment accidents caused by a bolting failure also occur from time to time; In the process of equipment installation and maintenance, hydraulic wrenches must be used for the installation and removal of large-sized bolts. It is not only simple and convenient to use, but also provides very accurate torque, with a torque accuracy of ±3%, which is impossible to achieve manually.

How does a hydraulic torque wrench work?

A set of hydraulic torque wrench tools is composed of a hydraulic wrench, a hydraulic torque wrench pump, a high-pressure hose (safety factor 4:1 ), and a hexagon reducer (or impact socket). The hydraulic wrench is composed of the body (also called the shell), the drive unit(hydraulic cylinders), and the transmission parts(ratchet and driveshaft). Before using the hydraulic torque wrench pump, fill 46# anti-wear hydraulic oil into the oil tank, and turn on the power to start the pump station, the pump station will generate pressure through the operation of the motor, and It is transmitted to the hydraulic wrench through the high-pressure oil pipe, pushes the piston rod in the drive unit, and the piston rod drives the ratchet so that the ratchet drives the drive shaft of the wrench to complete the work of tightening or loosening the nut. The drive units output power, the piston rod in the drive unit, and the transmission part form a motion pair, the distance from the center of the drive unit cylinder to the center of the transmission part is the hydraulic wrench amplifying force arm, and the output force of the drive unit cylinder multiplied by the force arm is the actual output torque of the hydraulic wrench.

Things needs to pay attention to when using hydraulic wrench

Things need to pay attention to when using the hydraulic wrench

  1. The first thing that needs to do when operating is to adjust the pressure. The operator can complete this step through the remote switch button. For example, if a popping sound is heard during operation, it means that the wrench is in place. , stop rotating, and it still needs to be locked when adjusting. If you want it to achieve a better locking purpose in use, you need to set the torque, pump station pressure and wrench turning direction, etc. The use of a hydraulic wrench should adhere to the principle of safety first. A hydraulic torque wrench is a power tool. Before use, you should carefully read the instructions, warnings, and precautions, and follow safety measures to avoid personal injury and equipment damage during operation.
  2. In order to avoid personal injury and equipment damage during operation, it is necessary to ensure that each hydraulic component can withstand the working pressure of 70MPa, the guard plate on the hydraulic torque wrench shall not be removed, and the wrench and accessories shall not be changed, and the safety on the rotary joint shall not be changed. valve. Use a hydraulic torque wrench not to exceed the rated load of the equipment, try to avoid the danger of overloading, and use a pressure gauge in the system to display the operating load.
  3. In order to avoid damage to the hydraulic oil pipe, the serious bending and winding of the hydraulic oil pipe should be avoided during use. Severe bending and winding will cause excessive back pressure, which will damage the inner part of the oil pipe and cause it to be scrapped prematurely! Do not use damaged sockets and inserts, do not use metric sockets to remove inch nuts and bolts, and use original high-performance sockets and inserts!

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