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 the accuracy of their mechanical performance testing directly affects engineering safety. However, traditional steel strand tensile testing has long faced industry pain points such as high "breakage rate", consumption of aluminum sheets and diamond sand, and cumbersome operation. Jinan Xinguang Testing Machine Manufacturing Co., Ltd. (hereinafter referred to as "Xinguang") is a series of microcomputer controlled electro-hydraulic servo toothless steel strand testing machines. With the self-developed toothless arc-shaped jaw technology as the core, it provides more efficient, accurate, and economical testing solutions for the production inspection, quality certification, and engineering acceptance of prestressed steel strands.
The technical advantages of the toothless steel strand clamp are reflected in the following aspects:
1. Circular arc-shaped clamping surface, uniform force: The clamping surface has no teeth, and the corresponding circumferential angle of the curvature is less than 90 °. When the two jaws are matched, a circle is formed with a diameter equal to the nominal diameter of the steel strand, ensuring that the six steel wires are simultaneously subjected to effective clamping force, reducing the gap between the steel wires, and ensuring uniform overall force.
2. No need for auxiliary consumables, cost reduction and efficiency improvement: Completely bid farewell to auxiliary materials such as aluminum sheets, glue, and diamond sand, save disassembly and cleaning steps, significantly shorten single test time, and significantly reduce test costs.
3. High hardness clamping layer, durable: The toothless steel wire clamp is formed by heat treatment to form a clamping layer, with a hardness controlled at HRC58 ± 3.2, ensuring that the overall strength of the clamp is greater than the hardness of the steel wire, reducing clamp damage, and having a service life far beyond traditional toothed clamps.
4. Multi specification integration, fast switching: Multiple arc-shaped clamping ports can be opened in parallel on the clamp, covering common steel strand specifications. There is no need to disassemble the clamp, and the specification switching can be completed by sliding directly, greatly improving the efficiency of the test.
The mainframe of the toothless steel strand testing machine adopts a hydraulic loading structure, and the testing position conforms to ergonomic design, making operation convenient and comfortable. The main engine adopts a bottom mounted oil cylinder and a four column two screw structure. The stretching space is located above the main engine, and the compression test space is located between the lower crossbeam and the worktable, with strong rigidity and high stability.
The equipment is equipped with a self-developed fully digital multi-channel closed-loop measurement and control system, which has three closed-loop functions, supports multiple control methods such as stress, strain, displacement, etc., and can be switched without impact. The system adopts a computer bus design, with an experimental force indication accuracy of better than ± 0.5%, and an effective measurement range covering 2% to 100% FS.
The control system supports multiple control methods such as constant rate test force, constant rate stress, and constant rate displacement, and PID parameters can be adjusted online. During the experiment, multiple curves such as force displacement and stress-strain are displayed in real time, and key indicators such as tensile strength, specified non proportional tensile strength (Rp0.2), elastic modulus, and elongation are automatically calculated, and testing reports that meet standard requirements are automatically generated.
The toothless steel strand testing machine complies with the following national standards and industry specifications:
-GB/T5224 Steel Strands for Prestressed Concrete
-GB/T228.1 "Tensile testing of metallic materials - Part 1: Room temperature test method"
-GB/T16826 "Electro hydraulic Servo Universal Testing Machine"
-JJG139 "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's main products cover a full range of categories, including electronic universal testing machines, hydraulic universal testing machines, electro-hydraulic servo fatigue testing machines, toothless steel strand testing machines, horizontal tensile testing machines, compression shear testing machines, static load anchoring testing machines, relaxation testing machines, fully automatic impact testing machines, high-strength bolt detectors, 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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