In response to this situation, we have developed a mechanically integrated measuring system for the spring tension of the folding mechanism, which organically combines electronic technology, computer technology and mechanical measuring device to achieve accurate measurement of the spring tension during the folding movement of the mechanism. The comprehensive control of the law of tension data changes, and at the same time completed the statistical processing and quality analysis. The main technical requirements of the measuring device and the working principle of the system The main technical requirements for the measuring of the spring tension of the folding mechanism are: firstly, the positional accuracy of the folding mechanism in the folding movement (ie the folding angle accuracy); the second is to monitor the change of the folding movement tension. In the process, the accurate measurement and display output of the spring tension value of the key measurement points are guaranteed; then the statistical processing, quality analysis and print output of the measurement data of the batch folding parts are performed. According to its technical requirements, considering the cost and other factors, the measurement system designed after analysis and research mainly includes PC microcomputer, single chip system, A/D card, data offline transmission card, photoelectric sensor, load cell, stepping motor, step Into the motor drive and harmonic reducer, synchronous toothed belt and other mechanical transmission mechanism. Its structural principle is shown in Figure 1. The working process is roughly as follows: the stepping motor and the harmonic reducer are controlled by the single-chip application system at the actual measurement site, and the mechanical arm mechanism is driven to drive the load cell and the measured object to generate a folding rotary motion, and collect data during the dynamic process of the folding movement. After the signal is A/D converted and amplified, it enters the MCU system. In the MCU system, the data will be erased, noise, scale conversion, and piecewise regression, and then stored and displayed.
The start position signal of the folding motion is determined by the photosensor. The statistical processing, quality analysis, printout of a batch of parts, and the curve fitting work reflecting the variation of the spring tension during the folding movement are all completed in the upper computer. The data measured in the field is connected to the host computer through the RS232 serial port by another single-chip data transmission card, so that offline data transmission without power loss is realized. Design focus and characteristics In the design of mechatronics devices, mechanical, electrical, and electronic are physical models with completely different performance laws. There are difficulties in matching. The functions, accuracy, and performance of each component are good, but the overall system. Not well coordinated, this section introduces the main features of the design. Dynamic Process Signal Acquisition Design This system strives for simple structure, good dynamic and static stiffness, high manufacturing precision in the design of mechanical body, and mature products with precision mechanical technology, such as harmonic reducer and synchronous toothed belt, etc. Ensure that the mechanical transmission of the measuring device is even and stable. After analyzing and researching the parts of the spring folding mechanism to be tested, it is concluded that the signal collected by the load cell when the folding mechanism of the composite spring component is folded to a certain angle is firstly caused by the connection position and condition of the spring. The force is different; in addition, there are gap problems in the mechanical mechanism. When the constant speed is stable, the gap is concentrated in one direction. When it is stationary, the gap has randomness, which will inevitably result in a large difference in the repeatability measurement value of the same folding angle position of the same part. The measurement accuracy is low, and this problem is unavoidable by the inherent characteristics of the mechanical structure. If the measurement is repeated multiple times in the field, it is unrealistic to use the arithmetic mean as the best approximation of the true value. Therefore, the static measurement scheme like the electronic scale is simple but not desirable. In order to ensure the accuracy of one measurement at the site, the design adopts the spring tension signal during the constant-speed and stable folding rotation dynamic process. On the one hand, the error caused by the mechanical structure features is effectively improved, and the other aspect is used in uniform motion. The region's multiple data mathematical model processing replaces the arithmetic averaging of multiple points of data over a single point, which also facilitates the accurate measurement of the spring force of the key folding point.
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