The compression of the connected parts is achieved to achieve the purpose of fastening
To achieve sufficient pre-tensioning force, the bolt tightening mechanism relies on converting the applied torque into axial tension. This pre-tensioning creates tensile stress in the bolt while inducing compressive stress in the connected components, ensuring a secure and stable joint. The bolt stiffness is denoted as C1, with a corresponding tensile deformation δ1, while the joint stiffness is C2, resulting in a compression deformation δ2. The tensile and compressive forces acting on the bolt are both equal to F1, and this relationship is visualized through the force-deformation diagram of the bolted connection. Together, these forces define the preload.
The pre-tightening force is carefully set by the fastener to maintain a safe and closed condition between the screen box and steel frame under all operating conditions. This preload is determined based on the force state described earlier. It must ensure that the fastener can reliably withstand the maximum inertial pulling force and effectively transfer the lateral maximum inertial friction shear force through the clamping action. Sufficient safety margins should also be considered. During flat screen operation, the maximum inertial pulling force that the bolt must endure is equivalent to the maximum inertial friction shear force. However, when considering bolt stress, the shear force is typically much greater than the tensile force, as it acts tangentially to the pre-tensioning force. Therefore, an equivalent pre-tensioning force must be calculated to match the shear resistance requirements.
In long bolt connections, our factory still produces flat-shaped steel pipe structure flat screens, where the screen box is connected to the steel frame using bolts that pass through the upper and lower beams, as well as across the width of two special-shaped steel pipes. This design results in double shear, significantly enhancing fatigue resistance. With a large number of bolts used, the stress level on each individual bolt is considerably reduced. As a result, low-carbon steel standard bolts, which were previously used, have proven sufficient for the operational demands of the system.
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