Research Of Automatic Proofreading System For Back-pressure Pneumatic Measuring Instrument

Pneumatic measurement is a high-precision, high-efficiency measurement methods. The measurement method use compressed gas as it’s medium, can complete non-contact measurement, widely used in parts measurement site. But in order to reduce the influence of air pressure changes, temperature changes and other factors on the measurement result of pneumatic measuring instrument, during its using, we need to proofread pneumatic measuring instrument. The current method of proof is a measure for the size, respectively, to produce two sizes proofing regulations. Then the workers use the two master gauge which combined with the probe to get two gap sizes, and in accordance with the results of these two gap size measured to proofread pneumatic measuring instrument. However, with the development of technology, as people of automation, high efficiency requirements; shortcomings exist in the school of the method gradually revealed. On the one hand it takes to produce proof regulation of human and material resources of money, and the need to re-create the master gauge wear; on the other hand there is inefficient manual proofreading shortcomings error-prone. Therefore, this paper proposes automated proofreading system to solve these problems.Through basic measurement principle of pneumatic and pneumatic measuring principle fully proofread research, this paper proposes the use of a nozzle flapper mechanism instead of other types of proofreading to proofreading program regulations, and deduce its equivalent relationship. Then use inner diameter-nozzle body for the study, by FLUENT fluid simulation and experimental validation of combining party to verify the correctness of the program. Further illustrate the feasibility of automatic calibration, followed by the realization of the task to design a mechanical automatic calibration mechanism controlling the body movement and control system.Fluid simulation process is to use the existing nozzle flapper mechanism to draw the corresponding fluid domain, first adjust the parameters in FLUENT to makes the simulation results with the experimental results based on the experimental results measured; obtain a correct simulation model and simulation methods. Then use the model parameters to simulate inside diameter-nozzle body, then the simulation results are compared with theoretical calculations to verify the correctness of the equivalent relationship.Automated proofreading mechanism is borrowed from the idea of a variety of micro actuator design. The institutions linear stepper motor driven, motor telescopic shaft push slider, slider mobile drive moving on the surface of the gauge block its annexed to accurately obtain the two-micron gap. Reset the slider is achieved by spring, the position of the motor is achieved by limit switches.Control system design including design smallest single-chip system module, buzzer module, voltage conversion module and the motor control module. The design of the system can work well with agencies to complete self-proofreading proofreading process.