Principles and Specifications of the Instrument Principles of the Instrument The BoltMikeó Ultrasonic Bolt Stressmeter uses a reliable pulse-echo technique in ultrasonic measurement. An ultrasonic sensor is placed at one end of the fastener to emit an acoustic pulse into the bolt, which pulse passes down the entire length of the fastener. The pulse is reflected back on the other side and the pulse is returned to the transducer of the ultrasonic wave as shown. When the bolt is pre-tensioned, the length of the bolt changes along the axial direction and the speed of sound in the bolt changes. At this time, the automatic waveform of the instrument shows the self-calibration function, which can measure the slight change of the axial length of the bolt, so as to accurately measure the axial force, stress and strain of the bolt, and can analyze the bolt tension tolerance according to the test data.
Ultrasonic pulse echo propagation mode in bolts 3.2 Technical Specifications BoltMikeó ultrasonic bolt stress gauge adopts the principle of ultrasonic non-destructive testing, which can accurately measure the load, axial stress and elongation of bolts. It can display these parameters while measuring and has The temperature compensation function has a measurement accuracy of 2%. The instrument has a built-in oscilloscope that can display the actual waveform and adjust parameters such as gain and delay. The measurable bolt length range is 196350mm. The stress measurement range is 1MPa>MPa, the load measurement range is 1N>N, and the elongation measurement range is 0.001mm>mm.
During the detection process, when the gate is opened to a certain degree of opening, the bolts are measured one by one, and the test value of the bolt preload is recorded. Then, close the gate so that the wire rope is in an unstressed state, and adjust the bolt with larger pre-tightening force and smaller bolt (the bolt with larger pre-tightening force relaxes the nut; the smaller the pre-tightening force Bolt fastening). Then raise the gate and repeat the above detection process. Make multiple measurements and adjustments until the tension of the wire rope is adjusted as required.
The test results are analyzed by taking the bolt measurement value on the left side of the gate and the test result. It can be seen from the test results that the tightening force of each bolt before the adjustment is very different, the wire rope is extremely uneven, and does not conform to the DL/T5019-945 water conservancy and hydropower project hoist manufacturing installation and acceptance procedures 6 and 5 outside Nanjing Qinhuai River remediation project Sanchahekou gate, hoist installation and acceptance technical requirements 6 requirements, while posing potential risks to the operation of the gate. After the commissioning, the pre-tightening force of each bolt has been changed significantly, and the wire rope tends to be uniform.
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