电子万能试验机对操作人员要求挺高的

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电子万能试验机:对于一般的材料试验选择1级的试验机完全足够,没有必要多花钱提高精度,对于科学研究和材料分析就需要0.5级精度的试验机;其实对于0.5级和1级精度的试验机在技术上差别并不明显,校验的方法和手段基本是一样的,这是修正点的不一样上,随着传感器技术的发展,传感器元件的线性度已经达到一个很高的水准,只要测量电路没有缺陷,抗干扰性能好的话,所有的试验机都会达到0.5级的精度是没有问题的,对于电测已经远远超出了0.5级的限定,国家标准定义的相对误差有待商榷。

It is not necessary to spend more money to improve the accuracy of the first-level testing machine for general material testing, but 0.5-level precision testing machine is needed for scientific research and material analysis. In fact, there is no obvious difference in technology between the 0.5-level and the first-level accuracy testing machine, and the method and means of verification are basically the same, which is repairing. On the other hand, with the development of sensor technology, the linearity of sensor elements has reached a very high level. As long as the measuring circuit is not defective and the anti-jamming performance is good, it is no problem that all the testing machines will reach the accuracy of 0.5 level, which is far beyond the limit of 0.5 level for electrical measurement. Relative errors in the definition of national standards need to be discussed.

现在大多数变形单元采用单芯片24位超低噪声模数转换器,此芯片集信号放大,A/D转换于一身。由于本套变形单元具有“以单芯片为核心,外围电路少”的特点,因此本系统具有精度高,稳定性能好,线性误差小,抗干扰能力强等特点。合理的设计,良好的工艺布局使放大器稳定性极好。它与放大器相联的单片计算机单元,作为主机的心脏,负责整机的放大器量程变换、数据采集、数据传输、万能试验机方式选择及液晶显示,直读的数字量化,同时可以把这些数据通过RS232口输出,通过RS232口也可以接受其它设备的指令。由于采用单片计算机控制,本单元具有自动调零的功能,调零时,只需在主界面按清零键即可全程自动清零,清零时间极短。

At present, most of the deformation units adopt a single chip 24-bit ultra-low noise analog-to-digital converter, which integrates signal amplification and A/D conversion. Because this deformation unit has the characteristics of "taking single chip as the core and few peripheral circuits", the system has the characteristics of high precision, good stability, small linear error and strong anti-jamming ability. Reasonable design and good process layout make the amplifier very stable. The single chip computer unit connected with the amplifier, as the heart of the host computer, is responsible for the amplifier range conversion, data acquisition, data transmission, universal testing machine mode selection and liquid crystal display, direct reading digital quantization, while these data can be output through RS232 ports, and other devices can be accepted through RS232 ports. Provisional instructions. Due to the use of single-chip computer control, this unit has the function of automatic zero-setting. When zero-setting, only pressing the zero-clearing key in the main interface can automatically zero-clearing the whole process, and the time of zero-clearing is very short.

变形测量工作原理:

The principle of deformation measurement is as follows:

应变式引伸计是由弹性元件和粘贴在它上的应变片组成的,当引伸计移动臂受力时,引起弹性体变形并使粘贴在它上面的应变片电阻值发生变化,原来万能试验机平衡的电桥失去平衡输出一个正比于变形的电压信号输出,由于引伸计输出的电信号极其微弱,必须经放大后才能达到要求的值,这个工作由完全由A/D转换器放大和转换,然后送到单片计算机进行处理,以直读的方式进行显示,同时通过RS232传输到计算机,进行数据处理。

Strain extensometer is composed of elastic elements and strain gauges pasted on it. When the moving arm of extensometer is stressed, the elastomer deforms and the resistance of strain gauges pasted on it changes. The unbalanced output of the bridge balanced by the universal testing machine is proportional to the voltage signal output of the deformation. The electric signal output by the extensometer is extremely weak. It must be amplified before it can reach the required value. This work is amplified and converted by A/D converter, and then sent to a single chip computer for processing. It is displayed in a direct reading way. At the same time, it is transmitted to the computer through RS232 for data processing.

根据试验材料的最大载荷选择所需要的试验机最大载荷(即量程),推荐材料试验载荷在拉力试验机量程的70%——90%左右为佳,这样既保证了试验的分辨率也可以延长试验机的使用寿命。力量越大机台也大,当然机台越大价格越贵。所以选择拉力机时并不是越大越好,而是万能试验机要选择与自己公司产品适合的力量范围,如果您不知道自己产品需要多大力,我公司的工程师可以帮助您计算所需力量大小,从而选择适合您产品的拉力试验机。

According to the maximum load of the test material, the maximum load (i.e. range) of the test machine is selected. It is recommended that the test load of the material should be 70%-90% of the range of the tension test machine, which not only ensures the resolution of the test, but also prolongs the service life of the test machine. The bigger the power, the more expensive the machine is. So when choosing the pulling machine, it is not the bigger the better, but the universal testing machine to choose the strength range suitable for your company's products. If you don't know how hard your products need, our engineers can help you calculate the strength needed, so as to select the pulling test machine suitable for your products.

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