Oxidized Regenerated Cellulose Oxidized Regenerated Cellulose Absorbable Gauze,Oxidized Regenerated Cellulose Fibrillar,Absorbent Oxidized Regenerated Hemostats Cellulose,Medical Grade Oxidized Regenerated Cellulose Shaoxing Aladdin Enterprise Co.,Ltd , https://www.xhemostat.com
Practicality of Tianhui Rally Testing Machine
There are many types of tensile machines , and it can be said that there are different names for different occasions, such as tensile strength testing machine, tensile strength testing machine, tensile testing machine, material testing machine, universal tensile testing machine, etc. Tensile test of tensile testing machine : The tensile test (stress-strain test) is carried out by clamping the two ends of the material sample on two fixtures separated by a certain distance. The two clamps are separated and stretched at a certain speed. The sample is measured for changes in stress on the sample until the sample is destroyed. The tensile test of the tensile machine is one of the widely used methods for studying the mechanical strength of the material, and it is necessary to use constant speed motion. According to the different methods of load measurement, the early stage can be roughly divided into two types: pendulum type tensile testing machine and electronic tensile testing machine. At present, the pendulum type tensile testing machine is rarely used in the market. The main reason is that the accuracy can not meet the current standard. Requirements, pull machine purchase considerations
First, you should first consider the need to test the range of material tension.
Â
The difference in the range of tension determines the difference between the sensors used and the structure of the tension machine, but this has little effect on the price (except for the door type). For general rubber manufacturers, the pulling range is 200 kg. Therefore, generally more single column type is used.
Â
Corresponding to the single-column structure is a door structure, which is adapted to a relatively large pulling force, such as 500 kg or more. Used in metal materials for testing. The speed is about 0.01~500 mm/min.
Â
Note: due to rubber and plastic manufacturers
Â
Generally, we must do extension, so we must add an extension when purchasing. The product inspection is OK. The accuracy can meet the requirements.
Â
Second, the problem of the test itinerary.
Â
According to the performance and requirements of the rubber test, the stroke can be 600-1000mm. For materials with an elongation of more than 1000%, a stroke of 1000 or 1200 mm can be used.
Â
Third, the standard configuration problem.
Â
The three basic configurations of intelligent: host, microcomputer, and printer, if the microcomputer is powerful, you can print directly. It can also be equipped with a regular computer. With a computer, you can perform complex data analysis, such as data editing, partial magnification, adjustable report formats, and statistical analysis of groups.
Â
If equipped with a computer, the manufacturer should give the corresponding control system.
Â
Fourth, the output results.
Â
The test result output can be arbitrarily set: zui gravity value, elongation, tensile strength, constant force elongation, constant elongation force value, yield strength, elastic modulus, and large test force of Zui. This can be said to be a comprehensive result of the output of the microcomputer when the microcomputer is operated. Some manufacturers in foreign countries can generally output these 8 items. Some domestic manufacturers can output 5-6 items, and some manufacturers can only output zui value, average value, and zui small value.
Â
5. Can be used as an experimental project.
Â
　　 Flexible packaging requires a multi-purpose tensile machine , that is, on the basis of different fixtures, it can be used for stretching, compression, bending, tearing, shearing, 180 degree peeling, and 90 degree peeling test.
Â
There are some high-end tensile machines on the market, except for the above items, because of their high precision (some reach one-hundred thousandth).
Â
Sixth, the main configuration of product machinery:
Â
Transmission, screw drive and rack drive, the former is expensive, high precision, high test repeatability; the latter is cheap, low precision, low test repeatability.
Â
The lead screw has a decisive effect on the measurement of the pull force accuracy. Generally there are ball screws, trapezoidal screws, and general screw. Among them, the accuracy of the ball screw is high, but its performance depends on the operation of the computer servo system, and the whole price is relatively expensive. The precision required for flexible packaging, that is, 0.5-1% accuracy, can be achieved with a general lead screw and a lead screw. Transmission, geared and chain drive, the former is expensive for high precision; the latter is cheap for low precision.
Â
The main cost of the sensor lies in the life. Photoelectric induction is one of the more advanced technologies. It can be used more than 100,000 times. It can be achieved by import and domestic joint ventures.
Â
Seven, test speed.
Â
Some of the market equipments are in the range of 10~500 mm/min, and some are in the range of 0.01~500 mm/min. The former generally uses the ordinary speed control system, the cost is lower, the roughness affects the accuracy; the latter uses the servo system, which is expensive and has high precision. For flexible packaging enterprises, the servo system is selected, and the speed range of 0.1~500mm/min is sufficient, so that the accuracy is not affected and the price is within a reasonable range.
Â
Eight, measurement accuracy.
Â
Accuracy issues, including force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These precision values ​​zui can be up to plus or minus 0.5. But for the average manufacturer, achieving 1% accuracy is sufficient. In addition, the force value resolution can almost reach one in 200,000.