Product Introduction

• The LAW-400 microcomputer controlled electro-hydraulic servo horizontal tensile testing machine is a specialized high-precision testing equipment used for tensile testing of specimens such as rigging, chains, wire ropes, and hand pulled hoists.

• This device can achieve automated operation, and experiments can be completed automatically through computer software. This device uses a load sensor to measure force, and is composed of a tension cylinder, frame, fixture, etc. to form a tension loading mechanism. The equipment is driven by a dedicated hydraulic power source, with electro-hydraulic servo control technology and computer data acquisition and processing, and can achieve fully automatic closed-loop control. The equipment consists of a test host, an oil source system (hydraulic power source), a measurement and control system, an electrical system, etc.

Product features

1、Testing machine host

• The host adopts a horizontal frame structure, with a cylinder stroke of 1500mm and a maximum distance of 15000mm between stretching aids. The two crossbeams with stretching fixtures, as well as the fixed crossbeam and tension crossbeam, are precision machined using cast steel parts. The truss is made of welded steel and matched on a horizontal machining center for processing. All auxiliary tools are precision machined after heat treatment with alloy steel. The overall design bearing capacity of the frame structure is 400kN, ensuring the precision, stability, and reliability of the testing machine.

• The adjustment of the tensile test space is achieved through the forward and backward movement of the distal crossbeam. The manual assistance method of inserting the two end pins vertically into the guide rail and the distal crossbeam, operating the pins to achieve crossbeam positioning, and completing the spatial adjustment of the testing machine, is very convenient, with an adjustment step distance of 500mm.

• The high-precision load sensor used in the host has high comprehensive accuracy, high sensitivity, and good repeatability. After random calibration, it is not affected by external forces during the test, ensuring the accuracy of the test process and parameters.

• The machine design takes into full consideration aesthetics, convenience, and safety. For example, adjusting the experimental space is convenient and fast; Reliable clamping with specialized fixtures; The testing machine undergoes strict rust prevention treatment throughout, and the surface of the pull rod is polished with hard chrome plating for rust prevention, ensuring the quality and appearance of the equipment to satisfy customers.

2、Oil source system

• The integrated oil source cabinet consists of a hydraulic pump station, oil source control, host control, computer host, etc., making it easy to operate, maintain, protect, and transport. The integrated measurement and control cabinet can accommodate computers, display screens, and printers, with a neat layout that saves space. The maximum working pressure of the oil source system can reach 25Mpa, with a maximum pressure of 30Mpa.

• The oil cylinder adopts a bi-directional control oil cylinder with multiple seals, and the main force of the oil cylinder is the pushing force. The cylinder barrel, piston, etc. are all made of high-strength wear-resistant materials, which will not cause deformation, wear, or leakage during long-term operation. Imported high-quality sealing rings, wear-resistant rings, dust rings, etc. are selected as sealing components.

• The power source adopts an imported high-pressure gear pump to ensure stable system pressure and smooth operation of the oil cylinder during long-term use. The system design fully considers energy conservation, reliability, safety, and environmental protection, and the oil source system uses components that meet environmental requirements.

• The entire system adopts servo closed-loop control, with high responsiveness servo valves, motor torque and speed stability, directional valves, differential valves, one-way valves, differential valves, and other components. The valve core responds quickly and has high sensitivity, thus possessing good tracking, follow-up, adjustability and other functional characteristics. Under high-performance measurement and control system control, precise closed-loop control is achieved to ensure test speed. It is currently the most advanced, high-quality, and high-end hydraulic servo control system in domestic testing machines.

• The system is equipped with a high-density hydraulic oil filtration system, ensuring the cleanliness of the medium oil under any conditions, and better guaranteeing the optimal functional state of each hydraulic valve and servo valve;

• The pressure self-protection function of the hydraulic system ensures the potential danger caused by unexpected situations and high human-machine safety and reliability;

3、Measurement and Control System

• The force measuring element of this product is a high-precision load sensor, and the displacement measuring element adopts a high-precision wire type displacement sensor. The load sensor, displacement sensor, fully digital closed-loop control system, computer, and servo hydraulic system together form a closed-loop measurement and control operating system. Therefore, various test procedures can be set and selected, and the test process can be automatically and accurately controlled, and the test parameters at each stage can be automatically measured to ensure high accuracy of the test.

• The specialized testing software used for installation is developed on the Windows platform, ensuring easy and universal testing operation, easy and convenient processing, storage, and transmission of test data, and real-time display of test process curves on the monitor.

• It can achieve long-term continuous rapid loading, holding, and unloading, as well as closed-loop control such as equal rate loading, long-term holding, constant rate unloading, and constant rate displacement.

• Segmented cyclic control of force, displacement, etc. can be achieved in one experiment, and each control can be smoothly switched between them. The experimental parameters can be automatically controlled and the experimental results can be obtained through computer collection and software processing. Real time display of test curves and results on the microcomputer screen, and printing of test reports and curves on the printer.

• The testing software can be set up and completed according to the testing methods and standards specified by ISO and GB, or it can be pre-set and completed according to the testing methods and standards provided by the customer based on their requirements. The experimental data can be connected to the network through a data interface, and the software can pre-set network interfaces according to user requirements and assist users in networking work.

• There is also limit protection, which includes protective devices for leakage and disconnection, limit switches, emergency stop buttons, and other protective devices.

4、Electrical system

• The power supply from the distribution box to each machine should be fixed and laid with conduit along the wall.

• The electronic control part is equipped with a manual switch.

Product Technical Parameters

• Maximum test force: 400kN;

• Testing machine level: Level 1;

• Test force measurement range: 2% -100% FS

• Test power resolution: ± 1/500000 of full scale;

• Relative error of test force indication: ± 1%;

• Range of loading rate: 0.5kN/s to 10kN/s;

• Test speed: 5mm/min-250mm/min;

• Maximum stretching range: 15000mm (adjustable);

• Effective inner width: 500mm

• Maximum stroke of piston: 1500mm;

• Clamping method: Pin type

• Dimensions: Approximately 19300 * 1200 * 727mm (excluding protective cover)

• Power supply: three-phase five wire system

Product standard configuration

1、Standard host

• Main frame (cylinder) of 400kN high rigidity horizontal tensile testing machine;

• Fully enclosed protective net (hydraulic start)

• High precision bidirectional electro-hydraulic servo proportional valve (Atos, Italy)

• High precision high-pressure gear pump (Italian MazuXi)

• High precision load sensor;

• High precision displacement sensor;

• Test fixture: pin type

2、Standard oil source system

A set of specialized oil source system, equipped with high-precision servo proportional valve, imported high-pressure gear pump, asynchronous motor, one-way valve, pressure relief valve, electromagnetic directional valve, as well as accessories such as oil filter, pressure gauge, air filter, etc., fully enclosed spray painted oil tank.

3、Standard measurement and control system

• Fully digital closed-loop control system;

• Specialized testing software (English version);

• HP desktop commercial computer   1set,

• HP printer   1set

• Integrated measurement and control operation cabinet   1set

• Software backup and related operation manual   1set

User preparation conditions

• Require as much clarity as possible on the standard rules and regulations of the test methods referenced and executed in the experiment;

• Provide samples that have been tested on this machine for product testing and factory inspection;

• Responsible for receiving, storing, and positioning products;

• The space and foundation required for equipment installation, power supply, etc;

• 46 # anti-wear hydraulic oil: 80 liters.