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When the air compressor is working, if the pressure does not meet the set requirements, the state of the pneumatic automatic switch is shown, the main contact is closed, and the air compressor is operating normally. When the pressure of the gas tank reaches the upper limit of the predetermined pressure, the compressed air overcomes the pressure of the main spring, jacks up the piston rod and the pressure plate, causes the spring to act on the spring plate, and jumps to the lower end point, so that the bakelite block 11 cuts off the circuit and stops the motor. . Conversely, when the air pressure of the air tank drops to the lower limit of the predetermined pressure, the springboard restarts again, jumps back to the upper end point through the balance point, turns the circuit on, and the motor runs again. The air pressure automatic switch also has a vent valve. When the springboard jumps down, the bottom of the bakelite block is pressed down, the vent valve is opened, and the pressure in the compressor pipe is discharged, so that the starting load is reduced when the motor is started next time.
As the pressure plate moves upward, the angle α will gradually become smaller. Therefore, the Fv of the springboard is gradually reduced. When the pressure plate reaches point B, the angle a is O, that is, Fv is 0; the angle a is more negative than the angle a. , that is, the Fv direction is reversed. When the pressure plate rises to a certain height near point B, Fv is small enough to resist W, so the right end of the springboard will drop slightly until the pressure plate is higher than point B. The reversed spring force component Fv drives the springboard to jump clockwise quickly. To the lower position. The process of rotating the right end of the springboard from the upper end to the lower end can be decomposed into: first slowly turning to the balance point, and then quickly jumping to the lower end point after the balance point. The same applies to the downward movement of the pressure plate. Under normal circumstances, the gravity of the bakelite block is balanced by the top spring 10, and W is only the gravity of the springboard itself, so W is small, that is, the corner of the springboard rotating to the critical equilibrium point is not large.
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