A pre-tightening force measuring device for threaded fasteners of oil pipe joints

Abstract

The invention relates to the field of oil pipe joint testing and discloses a pre-tightening force measuring device for a threaded fastener of an oil pipe joint. The device comprises a torque applyingmechanism, an external threaded member of the oil pipe joint coaxially connected to the output end of the torque applying mechanism, an adaption joint which is matched with the external threaded member and comprises separated inner threaded part and conical surface part, and a force conduction and detection mechanism which is connected to the adaption joint and is used for conducting and detectingpretightening force of the external threaded member on the conical surface part, and the force conduction and detection mechanism and an output end of the torque applying mechanism are coaxially arranged. According to the device, through separating and separately fixing the inner threaded part of the adaption joint and the conical surface part, the torque applying mechanism is used to drive the external threaded member to rotate to cooperate with the inner threaded part of the adaption joint, combined with the force conduction and detection mechanism, the pre-tightening force of the oil pipejoint can be directly detected, and the gap of the test in China is filled.

Description

technical field [0001] The invention relates to the testing field of oil pipe joints, in particular to a pretightening force measuring device for threaded fasteners of oil pipe joints. Background technique [0002] The most widely used threaded fastener connection system is the form of bolt-nut connection pair, most of which are used under the action of pre-tightening force. The connection under pre-tightening force can improve the reliability of bolt connection and enhance the tightness of the connected body and stiffness. In the threaded fastener connection system, when there is no pretightening force or the pretightening force is not enough, the real connection effect cannot be achieved, which is generally called undertightening; but too high pretightening force or overtightening can also lead to threaded connection s failure. [0003] For threaded fasteners with special structures such as oil pipe joints, such as oil pipe joints in brake pipes, according to the German ...

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Problems solved by technology

[0004] The invention provides a pre-tightening force measuring device for threaded fasteners of oil pipe joints, which solves the problems of existing measuring equipment mainly relying on imports, long cycle, inconvenient maintenance and low measurement accuracy.

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