Functional purpose:

 It is suitable for testing the torsion performance of high lock nut, including locking moment, turning moment, pre-tightening force and loosening moment. Locking torque refers to the maximum torque in the process of twisting in and the purchase value area can be set; loosening torque refers to the rotation torque in the state of no axial load, that is, the maximum or minimum torque in a screw out area section and the It is also suitable for self-locking nut locking performance test, to achieve purchase value area can be set.  The parameters such as total friction parameter μ total self-locking nut conventional locking torque test, torque loading test thread friction parameter μ thread, end friction coefficient μ end face, tightening 

Performance features: 

 1. The testing machine is equipped with a three claw chuck. When doing the test, it is necessary to fix the tooling of the nut sample and then clamp the tooling with the nut sample on the three claw chuck. The testing machine is equipped with an axial unloading device ，The principle is that after the axial loading force, the screw master sample is not rotated to achieve the unloading axial force. The main structure of the testing machine is composed of power device, axle unloading device and fixed chuck.

 2. The testing machine is simple to operate, accurate to control,

 The axial unloading device can move flexibly. When doing the test, the axial unloading

 3. Secondary screw in and out test screw the test bolt into the high lock nut locking convenient to maintain and greatly improves the test efficiency.

 device is not needed and the device can be moved to the back of the main engine; position, then install it on the testing machine set the relevant parameters, and the when doing the high lock nut test, the axial unloading device can be moved to the testing machine will automatically carry out the screw in and out test.

 4, the twisting torque test，the test bolt screwed into the high lock nut locking position, middle of two three claw chucks and then the sample test can be clamped. and then installed on the testing machine, set the phase parameters, the testing machine began the test the high lock nut drive part screwed off until the test is completed, read the test process when the maximum torque of the high lock nut drive

 5.Preloadingforce test，when the high lock nut is screwed, the maximum force value part screwed off displayed in the axial force channel of the testing machine is the preloading force of

 6. Loose force test after testing the pre tension force, the axial load is removed by the high lock nut，not turning the nut. Then clamp the nut, and the maximum torque required to turn the nut is the loosening torque of the high lock nut.