With the development of society, laboratory equipment has a market peak in the market. Since the application fields of tensile testing machines are very wide, there are many customers who need to purchase tensile testing machines. However, many customers do not understand much about the quality and practicality of the tension machine. Zhuoji Instruments reminds you to choose the following points when choosing a tension machine.
1. Main configuration: transmission, screw drive and rack drive, the former is expensive, used for high precision, high test repeatability, the latter is cheap, used for low precision, low test repeatability. The lead screw plays a decisive role in the measurement of tension accuracy. The general ones are ball screw, trapezoidal screw and general screw. Among them, the accuracy of the ball screw is the highest, but its performance can only be achieved by the operation of the computer servo system, and the whole set is relatively expensive. The precision required for flexible packaging, that is, 0.5-1% accuracy, can be achieved by using general screws and trapezoidal screws. Transmission, there are gear transmission and chain transmission, the former is expensive and used for high precision; the latter is cheap and used for low precision. The main cost of the sensor lies in the life span. The photoelectric sensor is one of the more advanced technologies, which is generally available for more than 100,000 times. The AC servo motor (which belongs to the control type motor) is equipped with encoder feedback closed-loop control, and is connected to the drive to detect the speed of the motor and compare and adjust it in the drive. Can meet fast response and accurate positioning. The materials, structure and processing technology are far from AC motors driven by inverters. When the output current, voltage and frequency of the servo drive change rapidly, the servo motor can produce changes in response, and the response characteristics and overload resistance are far higher The AC motor driven by the inverter (the inverter motor itself cannot react). Servo motors rely on pulse action and can detect the number of motor rotations, but ordinary motors cannot.
2. Experimental project. Flexible packaging requires a multi-purpose tensile testing machine, that is, on the basis of different fixtures, it can be used for tensile, compression, bending, tearing, shearing, 180-degree peeling, and 90-degree peeling tests. In addition to the above items, there are some high-end tension machines on the market that can test the coefficient of friction due to their high sensor accuracy (some reaching 150,000).
3. Itinerary. According to the performance and requirements of the flexible packaging film, the stroke can be 300-800mm. If the material elongation exceeds 1000%, the stroke of 1000 or 1200mm can be used.
4. Test speed. Some of the equipment on the market is 10 ~ 500mm / min, and some is 0.001 ~ 500mm / min. The former generally uses a common speed control system, which has low cost and roughness affects accuracy; the latter uses a servo system, which is expensive and has high accuracy. For flexible packaging Enterprises choose a servo system, the speed range of 1 ~ 500mm / min is enough, so that the accuracy is not affected, and the price is within a reasonable range.
5. Output results. The test result output can be arbitrarily set: maximum force value, elongation, tensile strength, constant force elongation, constant elongation force value, yield strength, elastic modulus, maximum test force 8 items. This can be said to be the most comprehensive result output when the microcomputer is operated. The products of some foreign manufacturers can generally output these 8 items. Some domestic manufacturers can output 5-6 items, and some manufacturers can only output the maximum force value, average value, and minimum value.
Combining the above points, I believe that you have more confidence in the various instruments on the market. If you do n’t understand or need to know more, you can find Shanghai Zhuoji Instrument Equipment Co., Ltd. to understand and discuss.
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