Production of domestic relaxation testing machine

The steel strand tensile stress relaxation testing machine is mainly used to test the tensile stress relaxation performance of prestressed steel wires, ribbed steel bars, PC steel bars and steel strands, and threaded steel at room temperature. It is suitable for testing materials in highway bridges, construction engineering, metrology and quality inspection, scientific research and testing institutes, metallurgical steel and other related industries.

According to the relevant requirements of the national standards GB/T5224-2003 "Steel Strand for Prestressed Concrete" and GB/T10120-1996 "Metal Stress Relaxation Test Method", the test is carried out. Based on the set test parameters, the control, data acquisition, display, and storage of the test process are automatically completed (main parameters: test force, relaxation force, relaxation rate or logarithmic relaxation rate, temperature). After the test is completed, the data can be analyzed and processed, and the test curve and test report required by the user can be printed out. Various test curves required by the standards can be selected (residual test force or logarithmic residual force, relaxation force or logarithmic relaxation force, relaxation rate or logarithmic relaxation rate, temperature, etc. can be plotted as the relationship curve with time or logarithmic time).

The computer software is developed on the Windows 98/Windows 2000/Windows XP platform, with a beautiful interface and easy operation; The test force and deformation display are displayed using configuration instruments, which are very eye-catching; Embedded database for easy data history tracing and networking requirements; The report is operated using templates, and users only need simple training to master it. The entire software has strong encapsulation, easy operation, and comprehensive functions; There is a standard test procedure, and by pressing the shortcut key, the test system can load the steel strand with 70% or 80% of the nominal test force within 3-5 minutes according to the standard requirements. It will automatically start recording test data within 1 minute and automatically terminate the test after reaching the set time. The correlation coefficient between the experimental curve and the theoretical fitting curve is over 99%. Therefore, the relaxation rate for 1000 hours can be calculated using 100 hours of experimental data, and a simulated recursive curve for 1000 hours can be displayed, which shortens the actual experimental time.

Technical Indicators:

The main form of the testing machine is a horizontal structure

Test force 300KN

Effective measurement range 2%~

Relative error of indication ± 1%

Speed range 0.01-50mm/min

Stretching space 1000-1200mm

Coaxiality within 15%

Sample specification: Φ 12.7; Φ15.2mm

Tensile test stroke 0-200mm

The dimensions of the host (length * width * height) are approximately 2280x440x1100mm

Weight approximately 800kg

Power supply voltage 220V

Power 750W

Automatic shutdown when the protection function exceeds the test force by 2% -5%