The working principle of bolt tensioner

The bolt tensioner is generally composed of a hydraulic pump, a high-pressure hose, a pressure gauge and a stretching body. The hydraulic pump is the power source, the pressure gauge reflects the output pressure of the pump, and the high-pressure hose is connected to the hydraulic pump and the stretching body. Stretching body is an executive element that realizes bolt stretching. It is mainly composed of a piston cylinder, a piston, a supporting bridge and a tension nut. The structure is shown in the figure below.

The structure of the bolt tensioner (Guide: Overview of the types and uses of rivet nuts)

When working, the high-pressure oil output by the power source is delivered to the piston cylinder 3 through the high-pressure hose, and the piston in the piston cylinder moves upward under pressure, driving the tension nut to move upward. The tension nut is threadedly connected with the working bolt, so that the working bolt is stretched to reach the required deformation, and the deformation is controlled within the elastic deformation range, and then the pre-tightening or disassembly operation is carried out, and finally through hydraulic or mechanical return The way to make the working bolt return to its original shape, complete the work.

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