Technical description of the hottest electronic un

Technical description of electronic universal material testing machine

I. product overview

microcomputer controlled electronic universal testing machine. The mechanical finite element analysis of the main frame makes the stress more reasonable, and the stiffness and strength of the frame are fully guaranteed. This series of testing machines are driven by AC servo system and motor, and equipped with reducer to reduce speed, which ensures that the testing machine can have a reduction ratio of up to 1:100000 times, with low noise, long service life and stable transmission

the transmission system adopts a zero estimated "1025" clearance ball screw pair with an average growth rate of about 10%, which ensures the accuracy and durability of the test results

pc control system realizes closed-loop control of test force, sample deformation, beam displacement and other parameters, data processing in line with the requirements of national standard gb228 "tensile test method for metallic materials at room temperature", as well as screen display, automatic processing (according to the corresponding test method) and disk storage of test force, peak value of test force, beam displacement, sample deformation and test curve

II. Main technical indicators:

main technical specifications -100

force measurement range 0.4%-1 of the maximum test force to make all extrusion operations reach the normal state 00%

the accuracy of the test force is better than ± 1% of the indicated value (precision level ± 0.5%)

the accuracy of deformation measurement is within 2%-100% of the full range of the extensometer, better than ± 1% of the indicated value

the resolution of beam displacement measurement is higher than 0.01mm

beam speed range 0 mm/min 0. Mm/min

the width of the test space is 400mm

1. The conventional electronic universal material testing machine

this kind of testing machine is the mainstream product of today's universal material testing machine. It uses the servo motor as the power source, and the lead screw and nut as the actuator to realize the speed control of the moving beam of the testing machine. It is simple to operate, has low requirements for testers, and the test stroke can be customized as needed. Although the control mode is relatively simple, There is only one control mode of speed, but its control accuracy and control range are very high and wide. Taking Regel's testing machine as an example, its speed adjustment range can reach 0.001mm/min ~ 1000mm/min, stepless speed regulation, control accuracy can reach 0.5%, and small tonnage models are easy to realize. If the friction coefficient is made, the full load is only 5N. It has great configuration flexibility. It can be equipped with sensors, fixtures and accessories of different tonnage as needed to realize multiple functions of one machine, and complete the functions of pulling, pressing, bending, shearing, peeling, tearing, friction coefficient, torsion, etc. Looking at the relevant standards for plastic mechanical property inspection, the requirements for the control mode of the testing machine are almost speed control. Therefore, this type of machine is the first choice for plastic mechanical property inspection, no matter from the control mode, speed range, test stroke and tonnage of the testing machine

2. Three closed loop electronic universal material testing machine

this kind of testing machine has the characteristics of wide speed range, large test stroke and flexible configuration of conventional electronic universal testing machine, and also has the advantages of force, displacement and deformation control of electro-hydraulic servo testing machine. Therefore, it is a kind of testing machine with good performance, but because the force control and deformation realize the scope industry and integration, the stability of the machine is closely related to the rigidity of the host machine and the rigidity of the sample. Generally, the tonnage of the plastic testing machine is small, so the rigidity of the main machine is low, and the rigidity of the sample itself is not too large, so there are few models of this kind of testing machine below 10kN, but the models of below 10kN are the most commonly used ones of the plastic class. The reason is 1. As mentioned above, the stability of this type of machine is related to the sample. If the sample is single, the test method is relatively single, and it can be selected. Otherwise, the control parameters of the testing machine (i.e. conventional P, I, D parameters) need to be adjusted at any time, which is almost unimaginable for non automatic control professional testers. Therefore, on the whole, it is not easy to choose to do the test of plastic materials except for the specific requirements for the control mode

3. Simple electric drawing

because the tensile strength of plastics is a very important index for the inspection of plastic mechanical properties, in previous years, there were not many kinds of plastics, and the application was not very wide. In the period of plastic mechanical property inspection items were relatively simple, and the corresponding standards were not very perfect. In this period, a single-purpose tensile testing machine with a motor as the power source, commonly known as electric drawing, was widely used because of its simple structure, single use and lack of performance indicators, but its price was very low. As the name suggests, it can only be used to do a single tensile test, and the data it can process is very limited, and the control measurement accuracy is relatively low. Although it is still used in some occasions, it has been gradually eliminated by the market because of its single function

4. Electro hydraulic servo universal material testing machine

this kind of testing machine is a kind of testing machine with relatively good performance at present. Because it adopts electro-hydraulic servo control technology, it can realize closed-loop control of force, displacement and deformation, and has good control performance. At present, it is widely used in metal and building materials where constant stress, constant strain and creep tests are required, but due to the limitation of oil source flow, its test speed is low. In order to increase the system stiffness and ensure the stable operation of closed-loop control, this kind of testing machine has small stroke, complex operation and difficult expansion configuration. There are few models below 10kN, so it is not suitable for the test of plastic and rubber materials

5. Hydraulic universal material testing machine

simple to use, low price and large tonnage. As the name suggests, hydraulic pressure shows that it is an open-loop control with poor performance. The operation process completely depends on the operator's operation level. In addition, because its mechanical structure and hydraulic loading principle determine its loading speed, the test stroke is small. At present, the minimum model of this kind of testing machine is 50kN, so its small load measurement accuracy is very low, and its expansion and configuration ability is very poor. It is generally only used in structural component tests or simple material performance tests, such as the pullout of connecting components, the tensile strength of reinforcement and other occasions

6, fatigue testing machine

this equipment is the product of fracture fatigue research at a certain stage of mechanical academic development. This experimental machine mainly measures S-N curve and fracture toughness test. (end)