What are the applications of proximity sensors?
The proximity sensor has the characteristics of long service life, reliable work, high repeat positioning accuracy, no mechanical wear, no spark, no noise, and strong anti-vibration ability. It can be used as limit, counting, positioning control and automatic protection link in the automatic control system. It is widely used in machine tool, metallurgy, chemical, textile and printing industries.
Application of Proximity Sensors in Aircraft Landing Gear Systems Aviation power units, landing gear systems, and navigation systems are among the top three systems in the aircraft difficulty report data reported by airlines. Among them, the failure of the landing gear system can easily cause abnormal events such as the return of the aircraft and the alternate landing, causing economic losses to the company and hidden dangers to aviation safety.
In the general Airbus aircraft landing gear control system, the digital fly-by-wire control system is usually used. The basic principle is to send the sensor signal to the control box (control computer), and send out instructions to the actuator after comprehensive calculation and comparison, and the control link is redundancy control.
The retracting and retracting of the landing gear of modern civil aircraft includes two systems: normal retracting and releasing and emergency release. The landing gear control system uses fly-by-wire control in the control mode, and is cross-linked with other systems. Inductive proximity sensors are widely used to detect the position of the landing gear.
Each landing gear has two main sensors, namely the retracted lock sensor and the lowered lock sensor, which are used to switch on the transmission position signal when the retracted and lowered locks are completed. This type of sensor is a magnetoresistive proximity sensor, which is mainly composed of two parts: the sensor body and the sensor excitation sheet.
The sensor body converts electrical energy into a magnetic field, and the excitation sheet mainly plays a role in increasing the magnetic permeability. When the landing gear and the excitation sheet are close to a certain distance, the permeability increases, and the sensor sends a signal to warn the component to indicate the position of the landing gear. The distance between them directly affects the accuracy of the indication, and the general adjustment requirements are also strict. In addition, different models are slightly different, you need to refer to the AMM manual of the model when adjusting.
The inductive proximity sensor is used to detect the position of the landing gear, which improves the life of the sensor. In addition, the information transmission and information sharing with the avionics system is conveniently realized by controlling the computer.
The application of proximity sensors in the monitoring of railroad crossings. In all railway accidents, train collisions account for a large part, and the consequences are often serious. The use of proximity sensors to monitor passing trains at intersections has become a very important link in improving railway safety measures.
In practical applications, using the feature of non-contact position measurement of proximity sensors, they can be installed symmetrically at both ends of the rail at the intersection. When a train passes by, the proximity sensors at both ends of the rail can detect the changes caused by the passing of the wheels at each end. By analyzing the signal of each sensor through the level crossing monitoring micro-processing system, it can judge the direction of the vehicle and the state of the crossing (passing or not, whether to stay). Finally, the information is sent to the traffic control center in the form of cable or wireless communication, so that the train can be dispatched.
The application of proximity sensors in automatic packaging machinery mechanized production has given birth to the demand for automatic packaging technology, and manual packaging methods are far from satisfying mass production operations. Automatic packaging machinery can complete the packaging process of a series of items under the guidance of the control system, improve product packaging efficiency, and reduce packaging costs, but it is still inevitable that there will be errors. For this reason, automatic packaging inspection has become an important part of ensuring packaging quality. Among them, in the case of ferromagnetic substances contained in the packaging process, non-contact detection using proximity sensors is a common method.
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