The Test Equipment For Packing Paper Performance

The physics performance checkout equipment of paper products is an instrument that is used for gauging physics performance of paper products, can be used as enterprises' carrying on quality control and quality testing department's carrying on quality testing to the products that the manufacturing enterprise produces in this trade by oneself. It is a kind of checkout equipment applied to the modern papermaking trade extensively. This text research one intensity performance detector and used for gauging intensity performance (ring pigeonhole intensity, keep intensity, flat to keep intensity for instance) of the paper products mainly. Traditional checkout equipment is mostly machinery type equipment, operate existing tediously, efficiency is low, the test result depends on the operator's engineering level and working experience, high shortcoming of the rate of accuracy. This text passes the analysis and research of the domestic and international similar equipment, reference their successful experience, I have carried on the research and development to the new-type intellectual checkout equipment. The new equipment uses the one-chip computer to control, liquid crystal to show, realizes simple man-machine dialogue through the keyboard and display screen, there are data statistics of testing that deal with the function, improve the intelligent level of the equipment. Operation principle the following of the equipment (take ring pigeonhole intensity experiment for the example): The example is putted on a each other parallel one, put two pressing plates, after the test begins, enabled urging the electrical machinery to work by the control system, drive and make the pressing plate to rise at the permanent speed, make the sample among two pressing plates receive strength, and the strength that the sample received is changed into a corresponding electric signal of simulation through the sensor, change by A/D converter analog signal digital signal send into one-chip computer system carry on after the amplifier is amplified, shown the window demonstrates the strength value that samples receives , and the showing value is up to samples and is changed by the change of pressure value; When the sample is reached its intensity value by the pressure, the sample is pressed routed, it presses routed peak value by the automatic memory of the one-chip computer, test data that the printer is typed. While the sample is pressed routed, the control system controls and urges the electrical machinery to overturn immediately, is it down pressing plate return to journey switch contact office shut down automatically, is it test next time to wait for to make. The system is divided into the mechanical part and the control part on the whole and the key part of the system is the control partly that is the key content studied too. It regards 8051 serial one-chip computers as the core controls the movement of drive motor by following ,analyzing and judging the signal passed by the sensor and the action of the machine part by the way of close-loop. The pressure value received of the sample, change into the corresponding electric signal for the micro-controller to deal with and store is sensed by the sensor, so sensor person who output equipment it tests to be one of the accurate keys or not. The error of influencing the sensor performance of the pressure is as follows, zero point skew, measure scope, zero point temperature skew, sensitivity temperature skew,linear error, etc. Among them the impact on above-mentioned parameters of temperature is enormous, implement correct temperature compensation to it, important to improve systematic performance. Temperature change lead to the fact main of influence as follows, to sensor among them (1) The full measure scope export; (2) Skew of the zero point. For the temperature compensation overall and correct to the sensor, must compensate these two respects. To the influence of temperature on full measure scope export, can adopt passive resistance component and sensor connect in parallel or way that contact go on temperature compensate by itself. Because the parallel way requires it to encourage the source in order to flow in the source permanently, it is the constant voltage source; the parallel resistance no longer has a function of temperature compensation. So connect in parallel resistance compensate though being simple, circuit good result have, but when the electric current is outputted or the voltage exports the limited power conduct to encourage, especially under the high temperature, it is not worth recommending connecting the resistance in parallel and compensating; Adopt series resistance is it use voltage source supply power to compensate, compensate technology to be complicated connecting in parallel, but it can offer higher precision and wider temperature range . Zero deviation voltage of sensor is it should consider from whole circuit system to compensate, is it output to full quantity to use for usually and zero deviation voltage implements the temperature compensation at the same time. Carry on to many sets of equipment centralized control trend of industrial control, at the same time for realize statistical analysis of long-term memory and in enormous quantities experimental data in experimental data, have carried on the design research of serial communication. Design the serial communication interface in theone-chip computer system, carry on data communication with the standard RS-232 interface of the PC and carry on the transmission of the experimental data. In going to the location machine (PC), use VB6. 0 has written the systems soft ware, the part of the database adopts SQLSERVER language, has offered the foundation for carrying on the statistical analysis of data in enormous quantities. The equipment should be applied to the industrial scene finally, and general industry has more interference factors live, the environment is comparatively abominable, so we should fully consider various kinds of interference factors of the scene, design anti-interference in the hardware of the system and software design, reduce and avoid the influence on the system of bad factor of the environment. Design the office of component department of the circuit board rationally, connect up rationally, adopt and exchange the voltage stabilizer and strengthen and improve systematic anti-interference ability; To system through use photosensitive resister and exchange solid state relay jointly control at controlling circuit attached interference source (urge electrical machinery), have weakened the interference to the system of the electrical machinery greatly. For carry on accurate measurement and control, must examine into noise and interference of signal to dispel, to interfere at random, strain with figure wave technology have simulation strain superiority wave can't substitute even more especially. In software design, this literary grace interferes the average law with the pulse of defending, in order to subdue the sharp pulse phenomenon that is often met in the industrial control occasion. Utilize 89C55 one-chip computer peculiar watchdog timer T3 (Watchdog Timer), work out " guard the gate dog procedure " operation state of monitoring system among software of control system, is it make it restored to the throne by force when thecontroller enters the wrong processor state a little (may cause the procedure to " fly to arbitrarily " by electric noise) to used in, make the system get back to the correct state. The system can establish the type and parameter that will do the experiment with the keyboard, has adopted LCD to make experimental result and data show softly, the writing is clear, and make the appearance of the equipment beautiful. Designed the serial communication interface at the same time, in order to adapt to centralized control. The whole system has good function expanding and adaptability. The system still controls, loses efficiency many kinds of functions and characteristics of protecting etc. more general equipment but the speech, have intelligent characteristics even more, the equipment not merely possessed the function of the old equipment originally, and has in fact overcome the shortcoming of the equipment, also increased by a lot of new functions, measure the precision after improving performance, has simplified and operated, and cost-push is not high, can replace the original equipment in a large amount .