The working principle of pneumatic transmission and control

Through the following typical pneumatic transmission system, we can understand how the pneumatic system transmits energy and signals and realizes control automation.

Pneumatic transmission system of pneumatic shearing machine

1-air compressor; 2-after cooler; 3-water separator; 4-air storage tank; 5-water separator and air filter;

6- Pressure reducing valve; 7- Lubricator; 8- Stroke valve; 9- Air control reversing valve; 10- Cylinder; 11- Work material.

Taking the pneumatic shearing machine as an example, the working principle of pneumatic transmission is introduced. The picture shows the working principle of the pneumatic shearing machine, and the position shown is the situation before cutting. The compressed air generated by the air compressor 1 reaches the reversing valve 9 after passing through the after-cooler 2, the water separation drainer 3, the air storage tank 4, the water separation air filter 5, the pressure reducing valve 6, the lubricator 7, and the reversing valve 9. It enters the lower chamber of the reversing valve 9 through the throttle passage, compresses the spring of the upper chamber, and the valve core of the reversing valve 9 is located at the upper end; most of the compressed air enters the upper chamber of the cylinder 10 after passing through the reversing valve 9, while the lower chamber of the cylinder It communicates with the atmosphere through the reversing valve, so the cylinder piston is at the lowest position. When the feeding device sends the work material 11 into the shearing machine and reaches the specified position, the work material presses down the stroke valve 8. At this time, the compressed air in the lower cavity of the valve core of the reversing valve 9 is discharged into the atmosphere through the stroke valve 8, and is pushed by the spring. , the valve core of the reversing valve 9 moves down to the lower end; the compressed air enters the lower chamber of the cylinder through the reversing valve 9, and the upper chamber communicates with the atmosphere through the reversing valve 9, and the piston of the cylinder moves upward to drive the scissors to cut the materials. After the material is cut, it is disconnected from the travel valve 8. The spool of the stroke valve 8 is reset under the action of the spring, and the outlet is blocked. The spool of the reversing valve 9 moves up. The cylinder piston moves downward and returns to the state before shearing.