Bolt tightening and inspection

Ordinary bolt connection does not require the bolt tightening axial force, so the bolt tightening construction is subject to the operator's hand feeling and the shape control of the connection joint. In layman's terms, an operator can use an ordinary wrench to tighten the nut by his own strength. , To ensure that the connected contact surface can be closely attached without obvious gaps. Although this fastening construction method has great differences, it can meet the connection requirements. In order to make the bolts in the joints evenly stressed, the bolt tightening sequence should start from the middle and proceed symmetrically to both sides; for large joints, double-tightening, that is, two tightening methods, should be used to ensure that each bolt in the joint can receive uniform force. (Guide: Briefly describe the processing methods of internal and external threads)

Ordinary bolt connection bolt tightening inspection is relatively simple, generally using hammering method. , That is, use a 3 kg small hammer, hold the bolt (or nut) head with one hand, and tap the hammer with the other hand, and require that the bolt head (nut) does not deviate or vibrate; if it does not loosen, the hammer sound is relatively simple. Otherwise, it means that the bolt tightening quality is not good and needs to be tightened again.

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