Product Overview

The KR‑208 heavy‑duty hydraulic universal tester is purpose‑built for mechanical‑property evaluation of prestressed steel strands. This complete system comprises rigid four‑column main frame, hydraulic power station, industrial desktop computer, printing device, large‑gauge electronic extensometer and high‑resolution optical displacement encoder. It is supplied with dedicated steel‑strand auxiliary fixtures that promote specimen fracture within the middle measuring section and greatly lower invalid test rates.

The supporting dedicated test suite renders six categories of real‑time curves: force‑displacement, force‑deformation, stress‑displacement, stress‑deformation, force‑time and deformation‑time. Built‑in self‑diagnosis routines help operators quickly locate hardware and parameter anomalies. The unit computes key material indexes such as tensile strength, specified non‑proportional extension strength, elastic modulus and total elongation automatically. It serves mining enterprises, research‑and‑development institutes, higher‑education institutions and engineering‑quality‑supervision authorities.

Core Product Competitive Advantages

1. Lower‑Mounted‑Cylinder Dual‑Chamber Heavy‑Duty Frame Hydraulic actuator is installed underneath the machine bed. The upper cavity provides ample tensile clearance for long steel‑strand samples; compression and bending operations are carried out in the zone between worktable and movable cross‑beam. Motor‑reducer, chain and auxiliary lead‑screw assembly drives cross‑beam travel for fast adjustment of test opening for specimens of varying dimensions.
2. Stable Manual‑Regulated Hydraulic Oil‑Circuit Architecture Hydraulic oil passes inlet filter before entering high‑pressure pump. Manual hand‑wheel valves regulate oil‑flow direction to actuate piston advance and retract. Return‑oil pipelines feed fluid back to the tank, maintaining stable pressure transmission for long‑duration static‑load and destructive‑break tests for high‑strength strand samples.
3. Open‑Architecture Windows Measurement‑&‑Control Software Supports tensile, compression, bending and shear test workflows. Operators are permitted to compose, modify, import and export custom test procedures and standard parameter templates. Test‑report outputs adopt editable Excel‑compatible format; users customize report layouts. Multi‑sample batch printing and custom sorting functions are available. Hierarchical account management differentiates administrator and ordinary‑tester access permissions to prevent unintended parameter changes.
4. Specialized Fixture Optimized for Steel‑Strand Specimens Purpose‑designed clamping assembly for prestressed strands distributes gripping force evenly, reducing premature fracture near the clamping jaws. This design raises valid‑test ratio and guarantees measured elongation and strength data match real‑material properties. Jaw inserts can be replaced to adapt strand diameters other than 15.20 mm.
5. Dual‑Level Hardware Safety Interlock Mechanism Overload protection: once applied force exceeds 103 % of rated maximum load, oil‑pump motor cuts off automatically. Travel‑limit safeguard: when piston arrives at upper mechanical boundary, pump power shuts down immediately to avoid impact damage to frame and internal components.

Complete Technical Parameter Table

Standard Complete Test Workflow

1. Pre‑Test Inspection & Parameter Configuration Check hydraulic‑oil liquid‑level, pipe‑joint tightness and safety‑interlock status. Boot the dedicated test software, create or recall pre‑configured test procedure, define termination thresholds and output‑report templates.
2. Adjust Test Space & Mount Specimen Operate motor‑driven cross‑beam to set proper cavity height. Secure prestressed steel‑strand sample inside special hydraulic wedge‑grips, make sure the specimen sits centered and is firmly locked.
3. Zero‑Calibration Perform force‑value, displacement and extensometer zero‑reset before formal loading to eliminate initial mechanical offset. Mount large‑gauge electronic extensometer onto the strand’s gauge‑length section.
4. Hydraulic Loading & Continuous Data Acquisition Trigger automated or manual loading sequence. Hydraulic system applies load following preset procedure; software captures force, displacement and deformation data continuously and renders multi‑group real‑time curves.
5. Post‑Test Data Processing & Report Export Upon specimen fracture or reaching stop criteria, test terminates automatically. Confirm fracture position is within the valid measuring zone; review characteristic‑point data, adjust curve markers, export datasets and generate editable inspection reports.
6. Equipment Shutdown Steps Retract piston and cross‑beam back to home position; remove broken specimen, clean fixture surfaces. Close software, shut down hydraulic power unit and cut main power supply.

Wide Industrial Application Scenarios

Bridge & Highway‑Engineering Enterprises

Mechanical‑property inspection for prestressed steel strands used in bridge, highway and precast‑concrete projects; incoming‑batch acceptance testing for construction‑site raw‑material supplies.

Metallurgical‑Material Manufacturers

Quality‑control verification for high‑strength steel‑strand finished products before factory shipment.

Mining & Heavy‑Industry Workshops

Tensile‑performance evaluation for large‑size metal bars and structural components.

University & Research‑Development Institutes

Material‑science teaching experiments; mechanical‑characteristic research for new‑type prestressed‑reinforcement materials.

Third‑Party Engineering‑Quality‑Supervision‑Institutions

Carry‑out standard‑compliant material‑performance tests and issue formal official inspection documents.

Standard Factory‑Full‑Delivery Kit

1. KR‑208 hydraulic universal‑tester main‑frame (lower‑mounted‑cylinder four‑column heavy‑duty structure)
2. Complete hydraulic power‑unit assembly and hydraulic‑pipe set
3. Motor‑chain‑lead‑screw cross‑beam height‑adjustment mechanism
4. Special automatic‑wedge steel‑strand tensile‑grip assembly
5. High‑precision force‑measurement module, optical displacement encoder and large‑gauge electronic extensometer
6. Industrial‑grade desktop computer + printer hardware bundle
7. Multilingual operation manual plus test‑software CD‑ROM
8. Factory‑issued force‑displacement‑deformation metrology calibration certificate

Global Distributor & After‑Sales‑Support

We provide remote technical support covering workflow editing, parameter tuning and routine‑maintenance guidance. Spare‑parts stock includes pressure‑sensors, hydraulic‑sealing elements and replacement fixture jaw inserts. Custom‑tonnage variants, enlarged‑test‑space frames and special‑purpose fixture assemblies are available for bulk‑purchase orders. Regional exclusive‑agent privileges contain priority‑production scheduling, OEM private‑branding service and complete‑set high‑definition product‑marketing‑image resources.

Product‑Banner‑Marketing‑Slogan

KR‑208 1000kN Hydraulic Universal Tester | Special‑Purpose Machine For Prestressed Steel‑Strand Mechanical‑Property Test

Core‑Feature‑Labels‑For‑Product‑Images

Lower‑Cylinder Four‑Column Heavy‑Duty Frame | Dedicated Steel‑Strand Grips | Six‑Type Real‑Time Test Curves | Open‑Editable Test Procedure | Customizable Excel Report Template | Overload & Stroke Dual‑Safety‑Protection

Safety‑Operation‑Reminder

Ensure specimens are firmly clamped before starting high‑force destructive tests. Keep personnel outside the fragment‑splashing hazard zone. Inspect hydraulic pipelines and sealing components periodically.