Microcomputer controlled electro-hydraulic cement pressure testing machine

1、 Purpose:

This testing machine is suitable for testing the flexural and compressive strength of cement mortar specimens, as well as the compressive strength of cement mortar specimens. This machine adopts hydraulic loading, and the pressure on the test piece is directly displayed by the microcomputer.

twoMain specifications

Anti compression part: Anti bending part:

2.1The maximum test force of this testing machine is KN: 300, and the maximum test force of the testing machine is N: 10000

2.2Measurement range KN: 10-300 Measurement range N: 1000-10000

2.3Test space: ￠ 160 × (175-375) Test space: 210 × 200

2.4Piston maximum stroke mm: 80 Piston maximum stroke mm: 50

2.5Indication accuracy: ≤± 1.0%

2.6Motor power: 1.1KW (0.75KW)

2.7Machine size mm: 940 × 580 × 1460

2.8Net weight Kg: 420

2.9Packing dimensions (length x width x height): 940 x 580 x 1460

2.10Packing weight Kg: 520

3、 Structure Introduction

This machine consists of the body, oil pump, high-precision digital servo valve, YAW-300D electro-hydraulic measurement and control system, branded computer, display and other main parts.

3.1 Body parts

The pressure bearing part is a frame structure, with two pillars connected by nuts to the upper and lower crossbeams, which are fastened to the platform. A dust cover is installed between the piston guard plate and the oil cylinder. The oil cylinder and piston installed in the middle of the lower crossbeam are the main components of this machine, and both need to be ground to have a specific fit clearance.

The supporting part is fixed by the platform, bottom plate, and six columns, supporting the pressure bearing part, control frame part, motor pump, oil tank, etc.

3.2 Oil pump, high-precision digital servo valve

After connecting the oil pump and motor, they are directly fixed on the oil tank, which is placed on the bottom plate of the frame. The high-precision digital servo valve is installed at the bottom of the control cabinet, and the control cabinet is fixed on the platform.

The oil pump is a straight axis axial piston pump. When applying force, high-pressure oil from the oil pump enters the differential pressure valve and is controlled by a digital servo valve or operation button. The control operation keyboard can adjust the oil volume of the cylinder to reach the required force application speed. The return oil from the oil cylinder flows back to the oil tank through the digital servo valve to relieve the force.

3.3 Force measurement control system

The YAW-300D digital electro-hydraulic measurement and control system adopts high-precision digital servo valves with force closed-loop control function, which can achieve equal load rate loading or equal stress rate loading. It has high control accuracy and good reliability, fully meeting the experimental requirements of GB, ISO, ASM and other standards for cement, concrete and other materials, especially suitable for experimental sites that require long-term continuous work.

4、 Safety device

Test force safety device, when the test force exceeds the maximum test force of each level by about 2% -5%, or when the sensor output reaches the maximum value, the switch will be activated to stop the motor.

A thermal relay is installed on the electrical board, and when the temperature rise exceeds the specified value, the motor stops running.

5、 Installation

The testing machine should be installed on a stable foundation, with a clean and dry environment, no corrosive gases, and no strong seismic sources attached.

6、 Preparation before the experiment

Before use, it is necessary to check the position of the oil gauge in the fuel tank (when the ambient temperature is 15 ± 5 ℃, it is recommended to use GB443-84N46, which is equivalent to No. 30 anti-wear hydraulic oil); When the ambient temperature is 25 ± 5 ℃, it is recommended to use GB443-84N68, which is equivalent to No. 40 anti-wear hydraulic oil.

7、 Overview

7.1.1 YAW-300D Microcomputer Controlled Pressure Testing Machine

The system adopts high-precision digital servo valves with force closed-loop control function, which can achieve equal load rate loading or equal stress rate loading with high control accuracy and good reliability. It fully meets the experimental requirements of GB, ISO, ASTM and other standards for cement, concrete and other materials, especially suitable for experimental sites that require long-term continuous work.

7.1.2 System composition:

The system consists of hardware and software.

Hardware includes: digital servo valve, high-precision sensor, YAW-300D digital electro-hydraulic measurement and control box, pressure reducing valve, and a set of connecting wires;

Measurement and Control Software: Pressure Testing Machine Measurement and Control Software Software Version: 6.0

7.1.3 System requirements:

7.1.3.1 Requirements for pressure testing machines

(1) The oil source for pressure testing must be stable; (2) There is no oil leakage in the oil system; (3) For testing machines with manual and automatic loading functions, the oil supply valve and return valve should be confirmed to be functioning properly.

7.1.3.2 Requirements of Measurement and Control System for Computer System

The system's minimum configuration is as follows:

PC with Pentium mmx200/32M or more memory
A serial port
Windows 9x or Win2000 operating system
Color graphics adapter and monitor (supporting display resolution of 800 * 600 or above)
7.1.4 System technical performance indicators:

1. Range of force measurement accuracy: maximum test force 4% -100%

2. Indication accuracy: ≤± 1%

3. Compression loading rate: 0.3kN/s-10kN/s ± 5%

4. Anti bending loading rate 50N ± 5N/S

8、 Introduction to intelligent digital force measuring instrument for press machine:

The YA-07 intelligent display force measuring instrument consists of high-precision pressure sensors, high stability amplification systems, high-precision A/D converters, digital tube displays, keyboard inputs, and print outputs. It is mainly suitable for measuring and displaying force values in various pressure testing machines, and can also be used for the modification of pointer pressure testing machines. It has a wide range of applications.
1、 Technical parameters
Rated working voltage:~220V ± 10%, 50HZ
Power consumption: ≤ 20W
Nonlinear repeatability error: ≤ 1% of soil
Working temperature: 0~40 ℃
Dimensions: 360 × 140 × 220
2、 Function
1. Time: year, month, day, hour, minute, second
2. Group number: 0001-9999
3. Section: (0) for non-standard specimens, no input area required (1) for cube compression test blocks of 100 × 100mm (2) for cube compression test blocks of 150 × 150mm (3) for cube compression test blocks of 200 × 200mm (4) for compression test blocks of any section (5) for flexural test blocks of 150 × 150 × 550mm (6) for flexural test blocks of 100 × 100 × 400mm (7) for compressive test blocks of 40 × 40 × 160mm (8) for compressive test blocks of 70.7 × 70.7mm
4. Storage function: The data stored in this instrument can still be retained after power failure, and the original stored data can be retrieved to print reports after power restoration. If communication software is used, it can also communicate with the microcomputer, archive the data inside the machine for future reference, or store it centrally through networking in the management center for quality supervision and computerized management. The largest storage capacity in this instrument is 120 test units, numbered from 01 to 120 #. When you enter 121 numbers, * numbers are cleared, and * numbers of data stored in 121 # are cleared.
5. Overload protection: When the test force value exceeds 3% of the system's maximum force value, the instrument can automatically cut off the oil pump motor.