Hydraulic wrench working principle is introduced in detail

A hydraulic torque wrench (hydraulic wrench) is a professional bolt tightening tool which is powered by hydraulic pressure and provides high torque output. It is used to install and disassemble bolts. It is often used to tighten and loosen bolts larger than one inch. The maximum output torque of the hydraulic torque wrench can reach 110000Nm, which not only improves the working efficiency, reduces the labor intensity, but also greatly improves the installation quality, and is also conducive to on-site safety management.

The use of hydraulic wrenches is very extensive. In the construction, maintenance and repair work of shipbuilding, petrochemical, construction, electric power, mining and metallurgical industries, hydraulic wrenches are a very important tool for the installation and disassembly of large-size bolts. There is no substitute for other tools. Not only is it easy to use and light, but the torque provided is huge and accurate. Torque repeatability is around 3%. According to relevant statistics, about 50% of equipment operation failures are caused by bolt problems. At the same time, the number of major equipment accidents caused by bolting problems is also very alarming. Therefore, in the process of equipment installation, maintenance and gun repair, bolts are tightly tightened. Solid and dismantling torques are required to be more stringent in most cases, and manual methods are difficult to achieve. Hydraulic bolts are the ideal choice for bolts with large torque specifications.

The hydraulic torque wrench is composed of a working head, a hydraulic pump and a high-pressure oil pipe. Through the high-pressure tubing, the hydraulic pump transmits power to the work head, which drives the tightening or loosening of the rotating nut of the work head. Hydraulic pumps can be powered by electricity or compressed air.

The head of the hydraulic wrench consists of three parts, the frame (also called the shell), the cylinder and the transmission part. The cylinder output force, the cylinder piston rod and the transmission part constitute a pair of motion, the distance from the center of the cylinder to the center of the transmission part is the hydraulic arm to enlarge the arm, and the output of the cylinder is multiplied by the arm, which is the theoretical output torque of the hydraulic wrench, due to friction resistance, the hydraulic wrench The actual output torque is less than the theoretical output torque.

Hydraulic wrenches are driven hydraulic torque wrenches and hollow hydraulic wrenches two series. Drive-type hydraulic torque wrenches are used with standard sleeves. They are universal hydraulic wrenches and have a wide range of applications. The hollow hydraulic wrench has a thin thickness, which is particularly suitable for a relatively narrow space. Applicable to electricity (nuclear power, wind power, hydropower, thermal power), ships, metallurgy, transportation, cement, construction, aviation and other fields.

Since the hydraulic wrench is often used in a narrow space and a very inconvenient transportation during the construction process, the size and weight of the wrench are the most important indicators. In order to reduce the size of components, the use of high-strength alloy materials and heat treatment is a common method.

For the use of high-strength alloy materials and heat treatment methods to achieve the purpose of reducing the size and weight of the parts. Due to the current widespread global trade, it is difficult to find high-strength materials. However, in order to increase the strength of one part, heat treatment and surface treatment must also be adopted. It is desirable that the strength of the parts is more than 1000 MPa and stable, and for the material. The uniformity of the strength is also extremely high (mainly due to the irregularities of the internal parts of the hydraulic drive wrench). At present, domestic enterprises are still difficult to achieve more than 1000 MPa for the internal parts of the hydraulic drive wrench, even if they can be achieved individually. It is difficult to achieve batch stability. It is also necessary to learn more from similar products abroad, invest more manpower and funds in a longer period of time, and try and experiment with materials and heat treatment.