Online calibration method and device for torque-controllable impact wrench
A technology of impact wrench and calibration method, which is applied in the direction of force/torque/power measuring instrument calibration/testing, measuring devices, instruments, etc., and can solve the problems that the impact wrench cannot be used to output accumulated torque detection and calibration, impact wrench, etc.
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Embodiment 1
[0053] see figure 1 , image 3 , Figure 4 , the online calibration method of the controllable torque impact wrench of the present invention, the process and steps of calibrating the controllable torque impact wrench at the job site are as follows (in order to ensure the accuracy of measurement and calibration, the measured torque is dynamic torque):
[0054] S1, according to the relationship between the torque and the rotation angle in the three stages of the tightening stage, the elastic stage, and the superelastic stage in the thread pair torsion process, the dynamic torque and the rotation angle are measured in real time, and the corresponding relationship curve between the dynamic torque and the rotation angle is established;
[0055] figure 1 The relationship curve between dynamic torque and rotation angle is shown, in which the OA section is the close-fitting stage. When the nut / bolt rotates and touches the workpiece and the washer after the empty space, the torque us...
Embodiment 2
[0073] The torque coefficient ke in the elastic stage is related to the friction surface roughness, lubrication condition, surface coating, material hardness, thread pair tolerance, machining accuracy (cylindricity, straightness, tooth shape error, pitch error, etc.) of the thread pair and the workpiece, It is related to the cleanliness of the assembly. Even if the same batch of workpieces to be torsion, bolts / nuts and washers and the same torsion process are used, the ke value still has a certain dispersion (such as figure 2 Shown), reducing the dispersion is beneficial to improve the torque control accuracy;
[0074] In the online calibration method of the controllable torque impact wrench in this embodiment, in order to improve the torque control accuracy, the following method is adopted to reduce the dispersion: the same batch of workpieces, bolts / nuts and washers are used at the same torsion station and the same torsion process conditions are used Next, twist multiple se...
Embodiment 3
[0078] see Figure 9 , Figure 10 , Figure 12 , this embodiment is an online calibration device for a controllable torque impact wrench that implements the aforementioned online calibration method for a controllable torque impact wrench.
[0079] In the controllable torque impact wrench online calibration device, the device body 10 includes a drive square hole 11, an output square tenon 13 and an intermediate elastic body 14 connecting the drive square hole and the output square tenon. Torque sensor 18, rotation angle sensor and microelectronics detection and processing unit 20, described microelectronics detection and processing unit 20 comprise microcontroller 21, torque and rotation angle signal conditioning circuit and OLED display 25; Described microcontroller 21 comprises data processing A unit and a non-volatile memory; the non-volatile memory stores the controllable torque impact wrench online calibration method algorithm program as described in embodiment 1 or embo...
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