WDW-T series Computer Control Type Electronic Universal Testing Machine

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Ⅰ、Main functions

This machine is applicable for tensile,compression, bending, shearing, peeling and tearing test of metal materials and non-metal materials.They may add test methods or rules of other materials to customers’need . They are essential testing instrument for quality testing section, university and colleges, research institution and industrial and mining enterprise.

Ⅱ、Product features

This machine adopts the most advanced and reliable console model constructer, imported whole digital alternating servo motor and servo adjustment system, imported load sens and photoelectric encoder. Whole digital measurement and control system can realize high precision, wide range measure and three closed loops control. The system of measure and control adopts high precision transducer, imported high quality electron device and whole digit design. And the card also complies with PCI2.1 and automatically distributes resources. Integrated double channels precision amplifier can automatically zero. Build-in large scale CPLD can program logistic chips, high speed operate and real time process. The whole digital control adjustment and demarcation can supply Single AD software interface. The software adopts blocking design, has many kinds of controlling means such as displacement, force, deformation, (stress and strain) metal tension and so on. Multistep control procedure can be compiled using program editor of the software by ourselves. We can analysis and process the testing data according to corresponding standards, and automatically finger out routine data, such as tensile strength, yield strength, modulus of elasticity, non-proportional extend strengthRP0.2, etc. Batch program of the software can sum up and compare the result and curve of one batch of specimen. The testing data adopts database management, supply word Exel and self-defining progra and meet with the special requirements. Flexible editing mode of report forms can print satisfied table.

Ⅲ、Technical Specification:

Type parameters		WDW-T50	WDW-T100	WDW-T200
Measuring range of testing force (kN)		0.2%--100%FS
Accuracy of testing force		±1%
Resolution of force		1/200000 of maximum force,no subsection full travel or seven subsections according to the requirements of customer
Accuracy of displacement measure		±0.5%
Resolution of displacement measure		0.03μm
Maximum value of displacement（mm）		0.001
Adjusting range of displacement speed		0.001-500mm/min
Accuracy of deformation measure		≤±0.5%
Range of deformation measure		2%～100%FS
Control accuracy of displacement speed		velocity＜0.01mm/min，±1.0%of the point； velocity≥0.01%mm/min，±0.2% of the point.
Effective tension testing space (mm)		650	650	600
Compression testing space (mm)		650	650	650
Width of testing space (mm)		560	560	600
Nip size(mm)	Thickness of flat specimen	0～14	0～14	0～20

Q:The difference and relation between the electric contact pressure gauge and the remote pressure gauge: The electric contact pressure meter is suitable for measuring the pressure of copper, alloy free of corrosion, explosion free, non crystallization of various liquids, gases and other media. When the electric contact manometer is used in conjunction with the corresponding electrical device, the two bit automatic control and sending (alarm) of the maximum or minimum pressure preset to the pressure system under test can be achieved. The electric contact pressure gauge has the function of measuring and controlling. It can freely set up the upper and lower control pressure values. The operation is stable and reliable. It is widely used in petroleum, chemical, power stations, metallurgy and other industrial enterprises and electromechanical equipment.The resistance remote pressure gauge consists of a spring tube, a pressure gauge, a slide wire, a resistance transmitter, etc..The function principle of the mechanical part of the pressure gauge is similar to that of the spring tube manometer. Because the resistance transmitter is arranged on the gear drive, so when the fan gear shaft gear transmission mechanism of deflection, rotating arm resistance transmitter (brush) corresponding to the deflection, brush sliding on the resistor, the change of the measured pressure is changed into a resistance value, and at the two time the meter, indicating a corresponding reading value. At the same time, the primary instrument also indicates the corresponding pressure value.

Q:Pressure gauges M20*1.5, M14*1.5 need to be equipped with DN how many valves, and pressure gauges, elbow and connector specifications, models: Yes, DN15 is OK

Q:What is the coefficient of error for the 2.5 grade pressure meter?: The calculation formula is that: the pressure of the table - pressure of the standard table / standard meter, the pressure *100% is less than or equal to 2.5% to be qualified.

Q:If the pressure gauge of the fire extinguisher is damaged and the interface of the pressure gauge is broken, will the fire extinguisher leak?: Whether there is no breach is not important, mainly the pressure indicator in the yellow area, green area proved to have no drainage pressure, red zone without pressure or too small, yellow zone pressure is too large, in case of high temperature and so on, the explosion is more serious, green zone safety. Rubber hose fire equipment stores have sold 2-5 yuan, the inner layer has not split open, you can use, indoor storage extinguishers can not exceed 2 years, to overhaul once (pointer in the green zone should be detected), 1 years, 1, the most security testing.

Q:The 3 lines of the remote pressure gauge are connected to an external potentiometer of the frequency converter. What parameters can be adopted to adjust the pressure? Thank you: Constant pressure water supply principle of remote pressure gauge:1. use frequency conversion motor to realize constant pressure water supply. Constant pressure water supply system based on pipeline pressure (i.e. remote pressure gauge readings) to set parameters, through computer-controlled inverter output frequency to adjust the rotational speed of water pump, to achieve closed-loop pipeline pressure regulation (PID), the automatic water supply system of constant to the set pressure value: the water consumption increases, the frequency increases, the pump speed is accelerated, water supply increases; reduce water consumption, reduce the frequency of pump speed slow down, water supply is reduced, so as to ensure the water supply efficiency requirements of water pressure and water at the same time, to improve the water quality and water supply efficiency, "how much water, how much water supply"; the device does not need to build the high water tank, water tower, no two pollution, is a modern building water supply equipment ideal.2. use the regulating valve to realize constant pressure water supply. The constant pressure water supply system based on pipeline pressure (i.e. remote pressure gauge readings) to set parameters, the computer controls the pump outlet valve open, closed loop water pressure regulation (PID), the automatic water supply system of constant to the set pressure value: the water consumption increases, the valve opening increases, water supply increases; reduce water consumption, reduces the valve opening, water supply is reduced, so as to ensure the water supply efficiency requirements of water pressure and water at the same time, in order to improve the water quality and water supply efficiency, "how much water, how much water supply".

Q:What are the problems with the pressure meter?What are the good solutions to these problems in the pressure gauge?: Summarize the common faults and causes the pressure gauge, in the operation of only the exchange, because of different brands and types of pressure gauges were different. Personal recommendation if there is a problem of replacement or return to the supplier, procurement of new products, and send check calibration analysis as follows:A pressure gauge without indication. Reason: 1, pressure pipe on the cut off valve does not open; 2, pipe plug; 3, spring tube joint too much dirt siltation and plug; 4, spring tube cracking; 5, the center gear and fan tooth wear too much, and is not engaged.Two, pointer shaking large. Reasons: 1, the pressure of the medium to be tested; 2, pressure gauge installation position of vibration

Q:250MPa calendar force, 150MPa verification point when the step-up is 148MPa, when the buck is 149MPa, please tell me how to calculate the value of error, return error is how to count? Thank you: Pressure meter return error: under the same conditions, the measured value is constant, the measuring instrument travel direction is different, the absolute value of the difference of its indication value. Note: return error is also called lag error."The return error" and "dead zone": JJF1001 "general terms and definitions for measurement", the term "no return error", but in 7.13 another definition of the term "dead zone" to describe "causing maximum variable interval dynamic measuring instrument in response to changing incentives". Therefore, return error is an index to measure the response characteristics of equipment".Does the return error accumulate? Take the positive and negative rotation of the motor as an example, the return error of the transmission mechanism should not be accumulated once and for all. In other words, back and forth movement many times, return error or fixed interval, does not increase.Application in the motor: the motor itself is no return error, how much encoder reads, how many pulses the stepper motor turns, and the servo system is usually higher than the stepper motor accuracy. The return error is generated by the drive mechanism, such as the screw rod connected on the output shaft of the motor. Therefore, the servo system can accurately control the motor, can't handle the return error. Therefore, the zero bit switch can eliminate zero return error in the course of motion, in addition to the zero power seeking of the incremental encoder. Even if the absolute encoder does not require power on and zero, the photoelectric switch can also be used to eliminate the return error. When there is no return error in the direction of return, it is necessary to set a zero position switch at both ends, so that the motor is backward to zero in this direction, and then the zero is used to measure the movement displacement.

Q:What are the diaphragm materials for the diaphragm pressure gauge?: Basically oil the following:316L stainless steel, HC/HB (Hastelloy), Ta (TA), Ti (TI), with PTFE (polytetrafluoroethylene), Monel alloy

Q:The gas pressure reducer has two measuring ranges, one big and one small pressure gauges. What's the function of each? What's the meaning of a red line on some pressure gauges?: Large (high pressure gauge): displays pressure before decompression - cylinder pressure;Small (low pressure gauge): displays pressure after decompression - use pressure;

Q:What is the green area of the pressure gauge on the extinguisher?: Domestic fire extinguishers generally pressure gauges are divided into three grades, both three colors.When the pressure gauge pointer refers to the red part, it shows that the pressure in the bottle is not enough, and the extinguisher can not be used properly.Refers to the yellow part, indicating too much pressure, prone to danger.When it comes to the green section, the extinguisher is normal.

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