Device for measuring relationship between pre-tightening torque and pre-tightening force of screw

Abstract

The invention provides a device for measuring the relationship between a pre-tightening torque and a pre-tightening force of a screw. The device for measuring relationship between the pre-tightening torque and the pre-tightening force of the screw comprises a force bearing framework, a lower screw connector, a lower screw chuck, a force sensor, an upper screw connector, an upper screw chuck, a torque wrench and a data collection and storage device; a torque is applied to the screw through the torque wrench, the force sensor can measure the corresponding pre-tightening force, the pre-tighteningtorque and pre-tightening force can be transmitted to the data collection and storage module in real time to obtain a pre-tightening torque and pre-tightening force curve relationship of different connection structures; and a connection test is performed by using the screw, the integrity of the test screw structure is not broken, the test tool is simple, and the pre-tightening torque and the corresponding pre-tightening force can be stored in thedata collection and storage module in real time to facilitate the data analysis.

Description

technical field [0001] The invention belongs to the technical field of structural testing applications, and in particular relates to a device for measuring the relationship between screw pre-tightening torque and pre-tightening force. Background technique [0002] Threaded connection is the most common connection method for mechanical structures. Usually, when screws are connected to structural parts, a reference pretightening torque will be given. For the threaded connection of many standard parts, the reference pretightening torque is very practical. However, in actual engineering In the process of use, especially in the aviation field, there are many non-standard parts. The pre-tightening torque is determined according to the thread size. Under the action of the reference pre-tightening torque, the root of the screw will be twisted, or the screw will break under the structural working environment, and abnormal The expected connection failed. [0003] For the increasingly...

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Problems solved by technology

[0002] Threaded connection is the most common connection method for mechanical structures. Usually, when screws are connected to structural parts, a reference pretightening torque will be given. For the threaded connection of many standard parts, the reference pretightening torque is very practical. However, in actual engineering In the process of use, especially in the aviation field, there are many non-standard parts. The pre-tightening torque is determined according to the thread size. Under the action of the reference pre-tightening torque, the root of the screw will be twisted, or the screw will break under the structural working environment, and abnormal Expected connection failure

[0003] For the increasingly complex threaded connections of non-standard parts and the harsh vibration environment of the aircraft during flight, the relationship between the screw pre-tightening torque and the pre-tightening force is becoming more and more complicated, and the factors affecting the relationship between the two are becoming more and more complex. Many, currently there is no mature software that can simulate and calculate the relationship between screw pre-tightening torque and pre-tightening force, and it can only be studied through experiments. Therefore, the device for measuring the relationship between screw pre-tightening torque and pre-tightening force can solve the problem Analysis provides important research tools

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