Applicable Standards
GB/T 2611-2007 "Testing Machines - General Technical Requirements"
JB/T 7406.1-1994 "Testing Machine Terminology - Material Testing Machines"
GB/T 16826-2008 "Electro-hydraulic Servo Universal Testing Machine"
Product Introduction and Features
1. Product Introduction:
The microcomputer-controlled electro-hydraulic servo pressure testing machine is specifically designed for compressive strength testing (load-bearing capacity testing) of metals and non-metals.
2. Main Structure and Functional Features:
2.1 It adopts a branded microcomputer to control a high-precision electro-hydraulic proportional valve, driving a precision hydraulic cylinder. It incorporates advanced testing machine control technology from Shimadzu Corporation of Japan. Based on national standards, it provides automatic control of test force and displacement (deformation) in various modes, completing the setting of test parameters, control of the testing process, data acquisition, processing, analysis, and display. It achieves precise and accurate control and measurement, including constant-speed displacement control and constant-speed test force control, with the function of setting and maintaining any test force point. It is equipped with dedicated Windows electro-hydraulic servo testing machine software. According to national standards or user-provided standards, it measures the performance parameters of the test specimen, statistically processes the test data, and then outputs and prints various required test curves and test reports. Selectable test curves include stress-strain, test force-strain, test force-time, test force-displacement, displacement-time, and deformation-time. It features real-time display, magnification, comparison, browsing functions, and monitoring of the testing process. It is intelligent and convenient.
2.2. This dedicated testing machine mainly consists of a main unit, oil source, control cabinet, and test force measurement and acquisition system. The main unit adopts a double-column frame structure, which is compact and easy to operate. The oil source uses a dedicated oil source for testing machines, with high system pressure, low noise, and stable performance. The measurement system mainly uses a high-precision load cell and a digital micrometer for deformation measurement to acquire data. The computer displays the test force and deformation amount, and has functions such as zeroing, calibration, gain adjustment, and peak hold. 2.3 The main unit is equipped with a hydraulic loading system on its side, utilizing a low-noise hydraulic pump unit and hydraulic valve group, and high-precision electro-hydraulic control valves to ensure high precision, high efficiency, low noise, and fast response of the system, enabling automatic control of loading and reversal during testing. A sensitive pressure compensation system is used for control, greatly simplifying the hydraulic system structure and reducing noise. Under non-full load conditions, it operates almost silently, eliminating the need for a complex cooling system or externalizing the hydraulic system to another room to isolate noise. Manual control uses "oil supply valve, oil return valve, and throttle valve," resulting in a simple and straightforward system.
3. Main Unit
The main unit consists of legs, a workbench, four columns, a crossbeam, a servo cylinder, a load sensor, a spherical pressure plate, and a deformation measuring mechanism. The legs are installed under the workbench, and the workbench and crossbeam form a rigid frame structure through the four columns. The servo cylinder is installed under the crossbeam and connected to the spherical pressure plate through a sensor; the specimen is placed in the center of the workbench. Hydraulic oil pushes the piston downwards through the rodless chamber of the servo cylinder, applying the test force to the specimen. The load sensor directly measures the test force.
Refer to the drawings (the compression distance and cylinder stroke are for reference only and will be customized according to actual conditions)
4. Hydraulic System
The control oil source is a new series of products recently developed by our company. This series of products is easy to use, has high control accuracy, and good reliability. During the research and development process, we have incorporated advanced international testing machine technology and combined it with the actual usage conditions of domestic users, adopting a "unitized, modular, and standardized" development concept. The key components of the testing machine are selected from well-known brands of similar products internationally and domestically, or processed using internationally advanced technology, greatly improving the stability and reliability of the system. The overall performance of the testing machine is comparable to internationally advanced products. The hydraulic principle is shown in the figure, which is a load-adaptive oil inlet throttling speed control system, with a servo valve controlling the testing process. The hydraulic oil in the oil tank is driven by a motor to a high-pressure pump, flowing through a check valve, a 10μ high-pressure oil filter, a differential pressure valve group, and an oil supply valve, into the cylinder. By manually controlling the opening size of the oil supply valve, the flow rate into the cylinder is controlled to meet the loading requirements. After the test is completed, open the return oil valve to relieve the pressure and return the cylinder to its initial position.
Constant Pressure Servo Control Station:
This system adopts the servo pump control principle and consists of an oil tank, a high-pressure plunger oil pump, an AC servo motor, high-pressure oil pipes, a gap-sealed oil cylinder, and a pressure sensor.
The oil in the oil tank is drawn into the oil pump through a filter, and then sent to the working oil cylinder through high-pressure oil pipes. The oil in the cylinder is continuously compressed, thus increasing the oil pressure. By adjusting the speed of the AC servo motor, the speed of the hydraulic oil entering the working oil cylinder can be adjusted, thereby controlling the rate of pressure increase, thus achieving servo control.
Multifunctional Testing Software:
This software is a flexible and fully functional testing software that allows users to design special test methods and program their own tests. This software integrates various control functions, data acquisition functions, and other auxiliary functions of the servo controller into a single panel using icons. Users can drag and drop these function icons onto the test definition panel with a mouse and combine them as needed to perform tests according to user-defined test methods. This software can be used for random spectrum testing.
a) The electrical control circuit refers to international standards and conforms to national testing machine electrical standards, ensuring strong anti-interference capabilities, controller stability, and accuracy of experimental data. b) Automatic Range Switching: Automatically switches to the appropriate range based on the load size to ensure the accuracy of measurement data; achieves true physical zero adjustment, gain adjustment, and automatic range switching, zeroing, calibration, and data saving for test force measurement, without any analog adjustment links, and with highly integrated control circuitry.
c) Conditional Data Saving: Test control data and sample conditions can be made into modules, facilitating batch testing;
d) Automatic Speed Change: The speed of the moving crosshead can be automatically changed according to a pre-set program during the test, or it can be changed manually;
e) Automatic Calibration: The system can automatically calibrate the accuracy of the indicated values;
f) Automatic Saving: After the test is completed, the test data and curves are automatically saved;
g) Process Implementation: The test process, measurement, display, and analysis are all completed by a microcomputer;
h) Batch Testing: For samples with the same parameters, testing can be completed sequentially after a single setting;
i) Test Software: Chinese WINDOWS interface, menu prompts, and mouse operation;
j) Display Mode: Data and curves are dynamically displayed during the test process;
k) Curve Traversal: After the test is completed, the curve can be re-analyzed, and the test data corresponding to any point on the curve can be found using the mouse;
l) Curve Selection: Stress-strain, force-displacement, force-time, displacement-time, and other curves can be selected for display and printing as needed;
m) Test Report: Reports can be prepared and printed in the format required by the user; it has a network interface for data transmission, storage, printing records, and network transmission printing, and can be connected to the enterprise's internal LAN or the Internet.
n) Limit Protection: Features two levels of limit protection: program-controlled and mechanical;
o) Automatic Shutdown: After the sample breaks, the moving crosshead automatically stops;
p) Overload Protection: When the load exceeds 3-5% of the maximum value of each range, the machine automatically stops;
The test results are obtained in both automatic and manual modes, and reports are automatically generated, simplifying the data analysis process.
Main Components:
1. Servo hydraulic power unit, 1 set;
2. Main machine and base blocks, 1 set;
3. Controller and control system (custom-made), 1 set (including connectors);
4. Software (custom-made);
5. Vertical control cabinet (custom-made);
6. Deformation measurement device (custom-made).
Safety Protection Devices:
a) Overload protection: When the test force exceeds 2%-5% of the maximum test force for each range, the machine stops.
b) Stroke protection: When the piston rises to the upper limit position, the oil pump motor stops.
c) Overload, overpressure, overheating, and overflow protection for the hydraulic oil circuit system;
d) Automatic shutdown protection at the end of the test;
Your message must be between 20-3,000 characters!
English
