In modern engineering such as high-speed railways, highway bridges, large-span venues, and large buildings, prestressed steel strands serve as the core load-bearing components, and their mechanical performance indicators such as tensile strength, specified non proportional elongation strength, elastic modulus, and elongation directly affect the safety and durability of engineering structures. The microcomputer controlled electro-hydraulic servo steel strand testing machine series of Jinan Xinguang Testing Machine Manufacturing Co., Ltd. (hereinafter referred to as "Xinguang") provides high-precision and fully automatic testing solutions for the production inspection, quality certification, and engineering acceptance of prestressed steel strands.
Steel strands have the characteristics of large diameter, high strength, and complex structure, and traditional testing machines are difficult to meet their specialized testing needs. The Xinguang steel strand testing machine is designed strictly in accordance with national and industry standards, and has the following outstanding advantages:
1. Multiple tonnage specifications, covering the full range of requirements: In response to the testing needs of different specifications of steel strands, Xinguang can provide various tonnage models such as 600kN and 1000kN, which can meet the tensile performance testing of prestressed steel strands with nominal diameters ranging from Φ 9.50mm to Φ 22.00mm, and comprehensively cover structural steel strands such as 1 × 7 and 1 × 19.
2. Bottom mounted oil cylinder main engine structure, strong rigidity and high stability: The main engine adopts a bottom mounted oil cylinder, four column and two screw structure, with the tensile space located above the main engine and the compression test space located between the lower crossbeam of the main engine and the worktable. The upper and lower jaw seats adopt a semi open structure, with good rigidity and long clamping length, effectively ensuring that the steel strand does not slip and can break from the middle, improving the success rate of the test.
3. Special extended jaws and hydraulic automatic clamping: equipped with steel strand special extended jaws to ensure the middle of the sample breaks and further improve the success rate of the test. The upper and lower jaws are equipped with compound cylinder hydraulic automatic fixtures, which are controlled by a movable manual control box and operated conveniently and efficiently.
4. High precision measurement and control system, no grading throughout the process: equipped with high-precision load sensors and imported photoelectric encoders, the accuracy of test force indication is better than ± 1% (level 1 accuracy), the effective measurement range covers 2% to 100% FS (no grading throughout the process), and the load measurement resolution is as high as 1/± 500000 yards. The displacement resolution is as high as 0.001mm, and the deformation measurement range is 0.2% -100% FS.
5. Fully automatic closed-loop control, intelligent loading: adopting a fully digital closed-loop measurement and control system, supporting multiple control modes such as constant rate test force, constant rate stress, constant rate displacement, constant load, constant strain, etc. The control modes can be randomly/arbitrarily switched, and the PID parameters can be adjusted online. Real time display of force displacement curve during the experiment, automatic calculation of key indicators such as tensile strength, specified non proportional tensile strength (Rp0.2), elastic modulus, elongation, etc.
6. Multi functional testing capability: equipped with a large gauge length electronic extensometer (gauge length 500mm, range 10mm), accurately measuring the deformation of steel strands within the gauge length. The test results can be queried and printed in six types of curves including force displacement, force deformation, stress displacement, stress deformation, force time, and deformation time, as well as related test data, and automatically generate detection reports that meet standard requirements.
7. Multiple security protections and humanized design:
-Flexible protective devices are installed on the upper part of the lower crossbeam and clamp plate to prevent oxidation inclusions from falling into the sliding surface during sample stretching, thereby extending the service life of the clamp plate
-Configure pressure following technology to make the working pressure of the oil cylinder vary with the loading size, effectively reducing equipment working noise and oil temperature, and improving hydraulic control accuracy
-Set multiple safety measures such as overload protection, overcurrent protection, limit protection, emergency stop button, etc
-Equipped with a piano desktop oil source cabinet, highly integrated and easy to operate
8. Intelligent software system: The measurement and control software independently developed by Xinguang adopts the Chinese Windows platform, with a beautiful and elegant interface and operation authorization management function. Support functions such as automatic input of sample size, automatic return after testing, automatic calibration, curve overlay comparison, local magnification analysis, custom programming of reports, etc., and can be networked with detection data management software.
The Xinguang steel strand testing machine fully complies with the following national standards and industry specifications:
-GB/T5224-2014 "Steel Strands for Prestressed Concrete"
-GB/T228.1-2021 "Tensile testing of metallic materials - Part 1: Room temperature test method"
-GB/T16826-2023 "Electro hydraulic Servo Universal Testing Machine"
-JJG139-2014 "Verification Regulations for Tensile, Pressure and Universal Testing Machines"
The product is widely used in the following fields:
-Bridge engineering: assessment of tensile strength and elastic modulus of cable-stayed cables, suspension bridge main cables, and externally prestressed steel strands
-Rail Transit: Material Testing of High Speed Railway ballastless Track and Metro Tunnel Segment Prestressed System
-In the field of architecture: Verification of the bearing capacity of prestressed steel bars in the core tube of high-rise buildings and anti floating anchor rods in basements
-Quality inspection agency: As the core equipment for third-party testing and certification, it carries out quality supervision and inspection of prestressed steel products
-Research Institute: Development, Verification, and Mechanical Performance Analysis of New Materials and Processes
-Water conservancy and hydropower: durability analysis of dam prestressed anchor cables and hydraulic gate opening and closing machine pull rods
Regarding Xinguang:
Jinan Xinguang Testing Machine Manufacturing Co., Ltd. was established in 2002 and is a national high-tech enterprise specializing in the research and development, manufacturing, and sales of mechanical testing instruments. The registered capital is 100 million yuan, the company has more than 120 employees, a building area of about 16000 square meters, and 151 sets of various large-scale CNC machining centers and specialized machine tools, with a processing and production capacity ranking among the top in the industry. The company has been awarded the honorary titles of "Specialized, Refined, Unique and New" small and medium-sized enterprise in Shandong Province, "Gazelle" enterprise in Shandong Province, and "Green Factory" in Jinan City, and has led the revision work of the national standard GB/T16826-2023 "Electro hydraulic Servo Universal Testing Machine".
The company's main products cover a full range of categories, including electronic universal testing machines, hydraulic universal testing machines, electro-hydraulic servo fatigue testing machines, steel strand testing machines, horizontal tensile testing machines, compression shear testing machines, static load anchoring testing machines, relaxation testing machines, etc. They are widely used in national defense and military industries, research institutes, quality inspection institutions, and major mining enterprises, and are exported to international markets such as North America, Europe, the Middle East, Southeast Asia, and South Korea.
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