拉力試驗機選購注意事項
1、首先要考慮需要測試的材料張力范圍
拉力的不同范圍，決定了不同傳感器的使用，也決定了拉力機的結構，但這對價格影響不大(門型除外)。 對于一般軟包裝廠家來說，100牛頓的張力范圍就足夠了。 所以我決定用單臂。 單臂式對應的結構是門式結構，適合承受較大的拉力，如噸位或噸位以上。 所以軟包裝廠家基本上是多余的。
2、試驗脫扣的問題
根據(jù)軟包裝膜試驗性能的需要和要求，行程在600-1500mm即可。 材料伸長率1000%以上可選擇行程1000或1200mm。
3. 標準配置問題
智能三基本配置:主機、微電腦、打印機，若微電腦功能強可直接打印。 它也可以配備普通電腦。 通過計算機，可以進行復雜的數(shù)據(jù)分析，如數(shù)據(jù)編輯、局部放大、可調報表、群組式統(tǒng)計分析等。 如果使用計算機，廠家應增加相應的控制系統(tǒng)。
4. 輸出結果
試驗結果的輸出結果可任意設置:最大力值、伸長率、抗拉強度、固定伸長、固定伸長力值、屈服強度、彈性模量、最大試驗力8項。 這可以說是微機操作最全面的輸出。 國外一些廠家的產(chǎn)品，一般都能產(chǎn)出這8個。 國內有的廠家可以輸出5-6個項目，有的廠家只能輸出最大值、平均值、最小值三個。
5、在實驗項目中
軟包裝需要一臺多功能拉伸機，即在配備不同夾具的基礎上，可以進行拉伸、壓縮、彎曲、撕裂、剪切、180度剝離、90度剝離試驗。 市場上除了以上項目還有一些高檔的拉絲機，由于其傳感器精度高(有的達到35萬)也可以測試摩擦系數(shù)。
6、產(chǎn)品機械主要配置
驅動、絲杠驅動和齒條驅動，前者價格昂貴，用于高精度、高測試重復性; 后者成本低，用于低精度和低重復性的測試。 絲杠對張力測量精度有決定性的影響。 一般滾珠絲杠、梯形絲杠、一般絲杠。 其中，滾珠絲杠精度最高，但其性能取決于電腦伺服系統(tǒng)的運行，整套價格相對昂貴。 一般絲杠和梯形絲杠都能達到軟包裝所要求的精度，即0.1-1%的精度。 傳動方式有齒輪傳動和鏈傳動，前者價格昂貴，用于精度高; 后者是便宜的，用于低精度。 傳感器的主要成本在于壽命，是光電感應技術中比較先進的一種，一般可用十萬次以上。
7. 測試速度
市場上有的設備在10~500mm/min，有的在0.001~500mm/min，前者一般采用普通調速系統(tǒng)，成本低，粗糙影響精度; 后者采用伺服系統(tǒng)，價格昂貴，精度高，對于軟包裝企業(yè)來說，選用伺服系統(tǒng)，轉速范圍1~500mm/min就足夠了，這樣既不影響精度，價格也在合理范圍內。
8. 測量精度
精度，包括測力精度、速度精度、變形精度、位移精度。 這些精度值可達正負0.5。 但對于一般制造商來說，1%的精度就足夠了。
英斯特力儀器是一家集研發(fā)、生產(chǎn)及銷售于一體的 影像測量儀，拉力試驗機, 硬度計 ,探傷儀, 粗糙度儀, 測厚儀, 金相設備廠家, 致力于為客戶提供更好的檢測儀器。
1, first of all, we should consider the range of material tension to be tested
The different range of tension, determines the use of different sensors, also determines the structure of the tension machine, but this has little impact on the price (except the door type). For general flexible packaging manufacturers, 100 Newtons of tension range is enough. So I decided to use one arm. The single-arm counterpart of the structure is a portal structure, suitable to withstand large tensile forces, such as tonnage or above. So flexible packaging manufacturers are basically redundant.
2. The problem of test trip
According to the test performance of flexible packaging film needs and requirements, the stroke in 600-1500mm. Material elongation more than 1000% can choose 1000 or 1200mm stroke.
3. Standard configuration problems
Intelligent three basic configuration: host, microcomputer, printer, if the microcomputer function is strong, can directly print. It can also be equipped with a regular computer. Through computers, complex data analysis can be carried out, such as data editing, local amplification, adjustable reports, group statistical analysis and so on. If computers are used, manufacturers should add corresponding control systems.
4. Output the result
The output results of the test results can be arbitrarily set: maximum force value, elongation, tensile strength, fixed elongation, fixed elongation force value, yield strength, elastic modulus, maximum test force 8 items. This is arguably the most comprehensive output of microcomputer operation. The products of some foreign manufacturers can produce these 8 generally. Some domestic manufacturers can output 5-6 items, some manufacturers can only output maximum, average, minimum three.
5. In the experimental project
Flexible packaging requires a multi-functional stretcher, that is, on the basis of different fixtures, can be stretched, compressed, bent, torn, shear, 180 degree peel, 90 degree peel test. In addition to the above projects, there are some high-end wire drawing machines on the market, due to its high sensor accuracy (some up to 350,000) can also test the friction coefficient.
6, product machinery main configuration
Drive, screw drive and rack drive, the former is expensive, used for high precision, high test repeatability; The latter has low cost and is used for low precision and low repeatability tests. The lead screw has a decisive influence on the tension measurement accuracy. General ball screw, trapezoidal screw, general screw. Among them, ball screw precision is the highest, but its performance depends on the operation of the computer servo system, the whole set of price is relatively expensive. General lead screw and trapezoidal lead screw can achieve the accuracy required by flexible packaging, that is, the accuracy of 0.1-1%. Transmission mode has gear transmission and chain transmission, the former is expensive, used for high precision; The latter is cheap and used for low precision. The main cost of the sensor lies in the life, is a more advanced photoelectric induction technology, generally available more than one hundred thousand times.
7. Test speed
Some equipment on the market in 10~500mm/min, some in 0.001~500mm/min, the former general use of ordinary speed control system, low cost, rough affect accuracy; The latter adopts servo system, expensive, high precision, for flexible packaging enterprises, choose servo system, speed range of 1~500mm/min is enough, so that neither affect the accuracy, the price is also within a reasonable range.
8. Measurement accuracy
Precision, including the precision of force measurement, velocity accuracy, deformation accuracy, displacement accuracy. These accuracy values can reach plus or minus 0.5. But for the average manufacturer, 1% accuracy is enough.
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