Take the fabric stretching function as an example:
1. Operation adjustment
(1) Clamping distance adjustment
Before the instrument tensile test, the clamping distance between the upper and lower clamps must be adjusted to be consistent with the set value. The specific adjustment method is:
①. Press the up button on the control panel to make the crane rise. After rising a certain distance, press the stop button to stop the crane.
②. According to the required length of the sample, move the lower limit block to the position of the corresponding hole (or indicator arrow) on the limit rod and tighten it. The limit rod is drilled with a lower limit positioning stop hole for positioning the lower limit collision block. Each hole indicates the clamping distance of the clamp to be tested.
③. Press the down button to make the crane descend to the lower limit position and stop automatically. Use a steel ruler to measure the distance between the upper and lower clamps. If there is a slight difference with the clamping distance requirement, the height of the upper limit collision nut can be adjusted (thread adjustment) to finally make the distance between the upper and lower clamps consistent with the clamping distance requirement.
④. According to the adjusted distance between the upper and lower clamps, check whether it is consistent with the set clamping distance. If not, repeat the above steps until it meets the requirements.
(2) Selection of pre-tension clamps
According to the specifications of the specimen, calculate the pre-tension value required for clamping the specimen according to the test standard, and then select the corresponding pre-tension clamp. (3) Test parameter setting According to the standard requirements, enter the value as prompted by the LCD screen. (4) Adjustment of stretching speed When testing a specimen, prepare a number of additional specimens more than the specified number of test strips for preliminary testing to determine the stretching speed.
(3) Test parameter setting
According to the standard requirements, enter the value as prompted by the LCD screen.
(4) Adjustment of stretching speed
When testing a specimen, prepare a number of additional specimens more than the specified number of test strips for preliminary testing to determine the stretching speed.
2. Clamping the specimen specimen clamp
According to the customized function configuration, take the corrugated clamp for fabric stretching function as an example:
a. Rotate the clamp handle to loosen the corrugated clamp;
b. Insert one end of the test strip from the bottom of the upper clamp into the opened upper clamp clamping mouth, and keep the specimen and the jaws straight:
c. Rotate the handle to clamp it;
d. Loosen the lower clamp handle to open the lower clamp jaws;
e. Pass the other end of the test strip clamped in the upper clamp through the lower clamp jaws, and clamp the strip through the jaws with the selected pre-tension clamp so that the specimen is straightened under the action of the pre-tension clamp;
f. Rotate the lower clamp handle to clamp the lower end of the specimen, and then remove the pre-tension clamp, and the specimen clamping is completed.
3. Tensile test
Press the start button on the base, the crane rises, and stretches the sample clamped between the upper and lower clamps. After breaking, the crane automatically returns to its original position, and the instrument automatically records and displays the maximum strength value (peak strength value), tensile length, elongation, breaking time and test number at the time of breaking.
4. Check and process the test results
①. Check the fracture position of the sample. If the distance between the fracture and the upper and lower clamp jaws is s5mm, cancel the test value and re-test. Press the delete key, and the instrument will process the test value accordingly (minus one, the test is invalid).
②. If the fracture position of the sample is normal; the test is valid, the strength and elongation curve of the test can be printed at this time, and then check the test number value. If the sample display value (the number of tests for this type of sample) is consistent with the set value, it indicates that the test of this type of sample is completed. Replace the new sample and continue the test; if the display value is less than the set sample value, repeat the previous action and continue the test on the strip sample of this type of sample.
5. Printing test report
After the sample has been tested for the required number of times, that is, when the sample display value is consistent with the set sample value, it means that the test of this sample has been completed and it can be printed at this time. When printing, press the print key, select the print format, and then print the test report after confirmation. Before printing, ensure that printing paper should be added to the printer; in addition, the printer's online indicator (ONLINE) must be on. After printing, you can continue to test, and press the print key later to print. If you need to perform a new test after printing, you need to press the reset key and then test again. If you need to print repeatedly, press the print key again after printing.
6. Display the test results directly through the LCD screen on the display panel.
7. After one set of samples is tested, press the reset button to restart the instrument and clear the existing stored data in the computer so that it can start working again.
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