Compressed air power system

The air used to actle the cylinder, previously passing through the stabilizer, enters the electromagnetic spool and then into the cylinder. In the pneumatic system of the machine gun, the most responsible nodes are the pneumoelectric membrane sensor and a self -adjusting measuring head. The measuring head has a metal case with a rubber nozzle, which is deformed in accordance with the curvature of the board in the transverse direction. Separate irregularities of the boards caused by staining of knots, distortion of wood fibers, etc. P., remain incomplete, causing an increase in the passing section and, accordingly, the flow of air fixed with a pneumoelectric sensor. Differential membrane sensors have high sensitivity and accuracy. At their work, vibrations of the working pressure practically do not reflect. The own errors of the membrane sensor usually do not exceed 1 mm, water. Art., T. e. 0.0001 kg/cm2. To evaluate the sensor errors in units of the measured value, it is necessary to know the specific conditions for the use of the sensor and the main parameters of the pneumatic measuring system: working pressure, its maximum value, the diameter of the measuring nozzle, etc. To date, there is no calculation method that allows you to determine the dynamic errors of the sensor when measuring on the go. Therefore, it is necessary to determine them experimentally, which ensures the possibility of an approximate assessment of the so -called dynamic error of the system. Based on the results, we can conclude that under these conditions, the pneumatic measuring system will respond to defects in the surfaces of the boards, causing an increase in the passing section by 1 mm2, the passage time above (the measuring head of the machine will be at least 0.2 seconds. At the speed of the boards of 12 m/min, the length of such a defect will be about 20 mm. Large surface defects that drop out a large increase in the clearance area of ​​the measuring heads will be marked by the sensor and with a smaller length of the defect.