Pressure switch principle and application example

Pressure switch is followed by a control system by the pressure of the pressure-electrical signal converters. When the system pressure increase or reduce to a certain level, send an electrical signal, the command electromagnetic valve or intermediate relay action, realize the order action, or when a fault occurs to be automatic parking.

The structure of the pressure switch as shown. Control the hydraulic oil mouths K system, when the system pressure is higher than the pressure switch of the adjustment pressure, film 11 and summon up, promote the piston 10 and steel ball 5 rise until a 4 shoulder met set of 3 ends. Piston rises to the level of steel ball and promoting sports, forcing the lever and bobbin 12 counterclockwise rotation, micro switch 14 under pressure to touch the stem send signals. Pressure switch signals when the system pressure and decided to advance compression spring 2, the compression through screws of the size of the 1 regulation.

Spring by the steel ball 9 plunger side close in on the wall of the body, make the column under fort, and body movement between certain friction. Due to the piston up and down, the friction force a change of direction, the pressure switch signals when the system pressure is higher than the broken system pressure signal, and the difference through screws and regulation.

Application example: can be used for coal winning machine hydraulic power automatic speed control agency, the main connection hydraulic components are: spindle move valve, pressure sensor, pressure switch. When coal winning machine traction overload (main lines pressure is greater than 15.7 ~ Pa), pressure sensor to open. And from the spindle move to pressure oil and valve by pressure sensor into the pressure switch, pressure switch action, make the contacts closed, electromagnetic valve and RV_ coil have electricity, coal winning machine automatic speed traction until overload condition lifted. After the termination of overload, pressure sensors in the spring under the function of closed, so pressure switch in the pressure sensor and the oil flow back to oil pool, where the contacts disconnect, electromagnetic valve coil without electricity, and, in the coal winning machine after slowing the speed traction.