1-spoke; 2- drive side shaft head; 3 -screw complete; 4-drive side bearing; 5-working side endcover;
6-working side bearing; 7-vacuum pump; 8-drive side bearing of vacuum box;9-bearing on working side of vacuum box;
10-bracket on working side of vacuum box; 11-rotary mechanism of vacuum box; 12-moving device of vacuum box;
13-air hose of pressurized sealing strip;14 - air inlet pipe


The vacuum couch roll on the fourdrinier paper machine is located at the place where the web of the forming fabric is removed, which is the end point of the working stroke section of the forming fabric. At the same time, it is an active roller wrapped by the forming fabric to drive the forming fabric to move.
The vacuum roller is composed of two parts: vacuum chamber and roll shell.

1.Vacuum chamber:Generally, it is made of tin bronze by centrifugal casting. When polyester mesh is used, copper shell coated with glue or stainless steel roller shell is used to prevent corrosion. The roller shell is full of countersunk round holes. The roller shell is connected with the transmission shaft, and the cantilever structure is designed for the need of changing the mesh.
2.Roll shell:Single chamber cast iron structure is commonly used, but double type and three chamber are also available. Different vacuum degree can be used for multi chamber to save dynamic consumption. The upper edge and the inner surface of the roller shell are sealed by air bag and friction strip, and width adjustment device is set.