In large assembly workshop, such as automobile assembly workshop, the number of the wrenches is large. Some wrenches that used in fields are scattered. It is not convenient to send all such wrenches to laboratory for calibration at the same time, so it is necessary to develop a torque wrench calibration device which is suitable for on-site calibration. An intelligent indicator with MCU was developed, which can display and record the torque value, which is convenient for operators to record the data without paper and can check the data later. The intelligent indicator can also calculate the error at the same time, which improves the work efficiency by replacing manual calculation. A DS2401 chip was hidden in the transducer. It is cheap and has an unique sequence code, which is easy to identified by MCU. The MCU seeks the codes already stored in the indicator and matches linear correction coefficient to the transducer. It is first to use DS2401 chip to realize plug and play, which can avoid the measurement error even device damage caused forgetting switch the channel. The device also has an chargeable motor, which can save time and labor especially when mechanical gap exists and load a large torque value. The main characters of the device are auto-identifying transducer, powerful data handling similar to a compute and chargeable motor. All of these guarantee the device being intelligent and efficiency for the on-site wrench calibration.
Currently, the vast majority of sensor applied in the field of dynamic testing is piezoelectric sensor, Piezoelectric sensors over 200t are very difficult to produce, However, the traditional strain sensor is not suitable for dynamic testing due to its insufficient frequency response, The large-range strain type dynamic three-component force sensor developed in this paper has been successfully applied in high-speed rail collision test experiment, which breaks the monopoly of piezoelectric sensor in the field of dynamic test and has a broad application prospect.
For the area for the aircraft weighing is relatively large and the display terminal is placed near the aircraft, the operator can’ not conveniently read the data on the display, so the platform-type aircraft weighing system based on the internet of things is developed. The system consists of three platforms, three digital modules, three 4G wireless modules and one cloud server. Three platforms containing sensors are placed under three wheels to measure the weight of an aircraft. The analog voltage signals of the sensors are converted to digital signals by digital modules and then uploaded to the cloud server by a 4G wireless module. A website with IP address consistent with the public IP address is established on the cloud server. The sensor data uploaded to the server is read by the ASP.NET Web Application program. A computer software is developed to log in to the website at any time to check the weighing data and calculate the position of the gravity center of the aircraft according to the formula for calculating the gravity center. The experimental results show that the weighing system is not limited by distance, has good real-time performance, stable operation and reliable calculation.
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