1. The purpose of the steel strand relaxation testing machine

The 300kN steel strand relaxation tester is mainly used to detect the relaxation test of various prestressed steel strands and rebars, and can detect the uniaxial tensile relaxation strength of steel strands and other metal wires. It can be widely used in quality inspection departments, construction units, steel strands and steel bar production enterprises, and is an important test equipment for modern building mechanics tests. 2. Steel strand relaxation testing machine according to standard 1. GB/T5224 steel strand for prestressed concrete  2. GB/T10120 metal stress relaxation test method  3. Function characteristics of steel strand relaxation testing machine

1.  The main frame of 2 times the maximum test force avoids the test error caused by the slack of the structural frame and increases the test accuracy.

2.  Imported load cell with high stability and high precision is adopted, which reduces the relative error of the test force value. 

3.  The grating digital deformation measurement sensor is used to fundamentally avoid the influence of the zero drift and temperature drift of the traditional analog sensor on the measurement results. The slight deformation of the sample is measured from time to time to ensure the long-term test. Stability is better than traditional displacement retention methods.

4.  Imported all-digital AC servo motor is adopted to ensure high efficiency of the transmission system, low noise and stable transmission. 

5.  Specialized modular test software, fully open design, hierarchical authority use management, and data transmission via networking.

Fourth, the technical parameters of the steel strand relaxation testing machine

1.  Maximum test force 300kN

2.  Effective measuring range 2%～100%FS

3.  Relative error of indication ±1%

4.  Speed adjustment range 0.01-50mm/min

The  testing machine host in the form of  vertical structure

6.Maximum  stretching space 1000mm

7.  Coaxiality within 1%

8.  Specimen specifications Φ7.1; Φ9.0; Φ10.70; Φ12.6mm

9.  Protection function : automatic shutdown when the maximum test force exceeds 2%-5%

10. The  host size (L * W * H). 1 0 00 * 700 *. 1 . 8 00mm