Torque on-line measurement method and device for torque-controllable impact wrench

A technology of impact wrench and measuring method, applied in measuring device, force/torque/work measuring instrument, measuring torque/torsion force during tightening, etc., which can solve the problem that the output torque value of impact wrench cannot be given, and the output of impact wrench cannot be accumulated. Issues such as torque detection and calibration

Active Publication Date: 2021-09-14
中国铁路郑州局集团有限公司科学技术研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core of this invention technology is to control the output torque of the impact wrench by detecting the total rotation angle or single rotation angle value of the nut / bolt during the impact torsion process, but the output torque value of the impact wrench still cannot be given
[0006] The patent applications 202110464723.7 and 202120895655.5 proposed by the applicant relate to a socket wrench intelligent conversion joint capable of monitoring torque and rotation angle and a socket wrench torque control method. The method of light indication and voice prompt guides the operator to apply the torque or torque and rotation angle to the qualified value range, instead of detecting the dynamic change value of the torque and rotation angle when the nut / bolt receives each impact during the multiple impacts of the impact wrench, it cannot be used Used to detect and calibrate the output cumulative torque of the impact wrench

Method used

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  • Torque on-line measurement method and device for torque-controllable impact wrench
  • Torque on-line measurement method and device for torque-controllable impact wrench
  • Torque on-line measurement method and device for torque-controllable impact wrench

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Effect test

Embodiment 1

[0046] see figure 1 , image 3 and Figure 4 , the online measurement method of the controllable torque impact wrench of the present invention, the steps of measuring the torque of the controllable torque impact wrench at the job site are as follows (in order to ensure the measurement accuracy, the measured torque is dynamic torque):

[0047] S1, according to the relationship between torque and rotation angle in the tight stage (O-A section), elastic stage (A-B section), and superelastic stage (B-C section) during the thread pair torsion process, measure the dynamic torque and rotation angle in real time, and save the dynamic torque and rotation angle curve coordinate data;

[0048] S2, use the coordinate data of the dynamic torque and rotation angle curve to continuously calculate the k value (ΔT / Δα), substitute the k value into the mathematical model of the intersection of the calculation curve and the straight line established through the test, and calculate and determine...

Embodiment 2

[0060] When twisting in the elastic stage, the torque coefficient ke is related to the frictional surface roughness, lubrication condition, surface coating, material hardness, thread pair tolerance, machining accuracy (cylindricity, straightness, tooth shape error, Pitch error, etc.), assembly cleanliness, even if the same batch of torsion workpieces, bolts / nuts and washers and the same torsion process are used, the ke value also has a certain dispersion (such as figure 2 Shown), reducing the dispersion is beneficial to improve the torque control accuracy;

[0061]The controllable torque impact wrench torque online measurement method of this embodiment adopts the following method to reduce the dispersion: for the same batch of workpieces, bolts / nuts and washers and using the same torsion process, multiple sets of thread pairs are respectively torsion, and the dynamic measurement is performed in real time. The data of the coordinate points of the torque and rotation angle curv...

Embodiment 3

[0065] see Figure 7 , Figure 8 , Figure 9 and Figure 10 , this embodiment is an on-line measurement device for implementing the above-mentioned on-line measurement method for the controllable torque impact wrench torque.

[0066] The on-line measurement device of the torque of the controllable torque impact wrench, the device body 10 includes a drive square hole 11, an output square tenon 13 and an elastic body 14 connecting the drive square hole and the output square tenon. There is a torque sensor 18, a rotation angle sensor and a microelectronic detection and processing unit 20, and the microelectronic detection and processing unit 20 includes a microcontroller 21, a torque signal conditioning circuit 22, a rotation angle signal conditioning circuit 23 and an OLED display 25; The controller 21 includes a data processing unit and a non-volatile memory; the non-volatile memory stores the algorithm program of the online measurement method of the controllable torque impa...

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Abstract

The invention relates to a torque on-line measurement method and device for a torque-controllable impact wrench. According to the method, aiming at the working environment of a twisting operation site and the elastic stage of bolt working, multiple sets of thread pairs to be twisted and workpieces in the same batch are twisted by the same process, and an accurate dynamic torque and rotation angle relational expression is measured, established and stored; and in the measuring process, an on-line measuring device detects the accumulated rotating angle of the bolt/nut in the impact torque application process in real time, the accumulated rotating angle is substituted into the dynamic torque and rotation angle relational expression, and the accumulated torque of the impact torque application of the controllable torque impact wrench is calculated and displayed. According to the invention, on-line measurement of the accumulated torque of the impact wrench is innovatively realized, the torque control accuracy is ensured, and the application range of the impact wrench is expanded.

Description

technical field [0001] The invention relates to an online measurement method and device for the torque of a controllable torque impact wrench, in particular to an online measurement of the torque of a controllable torque impact wrench for the same batch of bolts / nuts and workpieces to be torqued under the environment of the job site. A measurement method and a measurement device for realizing on-line measurement of the torque of a controllable torque impact wrench. Background technique [0002] Screw connection is widely used in various mechanical structures and is the most commonly used connection method at present. The essence of threaded connection is to reliably connect two or more components together by controlling the axial preload to an appropriate range. The axial preload is an important indicator for evaluating the reliability of thread pair connections. A large number of studies have shown that the greater the axial preload, the better the anti-loosening and anti-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L3/00G01L5/00G01L5/24
CPCG01L3/00G01L5/0042G01L5/24
Inventor 王留军刘明陈亮张中央刘芳田宏图
Owner 中国铁路郑州局集团有限公司科学技术研究所
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