Steel strand tensile testing machine

Main purpose

LAW series microcomputer controlled electro-hydraulic servo steel strand tensile testing machine is mainly used for tensile strength testing and analysis of prestressed steel strands.Test operation and data processing load requirements of GB/T5224-2014 "Prestressed Concrete Steel Strands".

This machine is composed of a main engine with a lower oil cylinder and a piano-type oil source control cabinet. The oil pump adopts a low-noise and high-performance gear pump imported from Mazzucci, Italy.The tensile space is located above the main machine, and the compression and bending tests are located below the main machine, between the middle beam and the workbench.The adjustment of the test space is realized by moving the middle beam, and the lifting and lowering of the middle beam is driven by a chain.The computer fully-automatic closed-loop controls the high-performance electro-hydraulic proportional servo valve to complete tension, compression, bending and other tests on various materials.After the test is completed, the experimental results such as FM, RPO.2, RM and Ft of the material are automatically taken.

Performance characteristics

1. The special extra-thick jaw seat allows the steel strand to be completely contained in the jaw seat when it is stretched, thereby ensuring that the steel strand sample breaks in the middle.

2. The special high hardness (HRC68-70) extended jaws increase the clamping lay length and contact area and adopt hydraulic automatic clamping, making the sample clamping more reliable and less likely to slip.

3. A wear-resistant lining plate is added between the jaw seat and the jaw clamping plate to prevent oxide scale from falling in during the metal stretching process and causing scratches on the bevel of the jaw seat, making the clamping process smoother and more reliable.

4. It has multiple control modes of isokinetic stress, isokinetic strain, isokinetic displacement, tensile control, and program editor. Various control modes can be smoothly switched and maintained during the test process.

5. The measurement and control software is based on the Chinese windowsSamples with the same conditions can be automatically generated in batches once input, and condition templates can also be created.

6. After the test is automatically completed, the sample information, test data, test curves, etc. are automatically stored.

7. Automatically switch to the appropriate range according to the test force or material deformation to ensure the accuracy of test data measurement.

8. The test data (test force, displacement, deformation) loading status and test curve are dynamically displayed on the screen in real time along with the test process.

9. According to actual needs, stress-strain, force-displacement, force-time, displacement-time and other curves can be selected for display, analysis and printing.

10. When the load exceeds 2%-5% of the full scale, automatic overload protection shuts down.

11. All relevant historical records can be automatically queried based on sample conditions, test date, test data and other conditions.

12. The software reserves a database interface to facilitate local networking between laboratories and experimental data management.

Technical parameters