A precision bolt connection torque-pretightening force mapping relationship measurement device

Abstract

The invention belongs to the field of micro-miniature precision instruments, and specifically discloses a precision bolt connection torque-pretightening force mapping relationship measuring device. Gantry bracket, spring wrench, replaceable small baffle plate, connecting column assembly, support frame assembly and limit assembly; T-type wrench is connected with the torque sensor assembly, and S-type high-precision sensor is installed on the support assembly and fixed with the connecting column assembly Connection, the limit component is fixedly installed on the support frame component, which can measure the torque and pre-tightening force during the bolt connection process for different types of bolts, fastening materials and lubricating conditions. The change rule of K value under the condition.

Description

technical field [0001] The invention belongs to the field of miniature precision instruments, and in particular relates to a measuring device for the mapping relationship between precision bolt connection torque and pretightening force. Background technique [0002] With the continuous increase in the precision and stability of precision instruments in aviation, spaceflight, military and medical treatment, the task of improving the precision and stability of precision instruments is imminent. Bolt connection is widely used in mechanical products due to its considerable connection force and easy disassembly and assembly. Accurately obtaining the relationship between torque and preload in bolted connections is of great significance for improving assembly quality. The pre-tightening force of the bolts means that all the bolts need to be tightened, and the connection receives the force in advance before bearing the working load. In the assembly of precision instruments, if the...

AI Technical Summary

Problems solved by technology

Among them, although the theoretical accuracy of the measurement method of the strain gauge method is relatively high, due to the complicated operation, the pasting quality of the strain gauge affects the final measurement accuracy, so this method is mainly suitable for laboratory experimental research, and is not suitable for engineering applications.

The ultrasonic method, this method has high measurement accuracy, but the disadvantage is that it has specific requirements for the structure and processing of the test bolts, and is only applicable to specific bolts

Due to the high-precision small bolt connection used in precision instruments has the characteristics of small size, high precision requirements, and easy damage, so the current torsion sensor measurement device based on the bolt connection of large mechanical products such as ships and vehicles is not suitable.

However, the torsion-tension relationship of the horizontally arranged measuring device using the torsion-tension sensor measurement method has low accuracy because the self-gravity of the bolt and the measuring instrument affects the coaxiality of the bolt connection.

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