Mesh, cloth mending, net tensioning, cloth tensioning
Mesh and felt straighteners are designed to maintain the position of the mesh and felt symmetrically to the axis of the machine in the mesh, press and drying parts of paper and cardboard machines with a cutting width of up to 4200 mm and a speed of up to 80 m/min.
Edits are made in standard designs. The mechanism ensures the movement of the correct shaft to the left or right of the middle position. The design of the edits provides for the installation of a scraper.
Edits are made of 3 types: manual, automatic and combined. Bracket diameter up to 220 mm.
Manual edits provide movement of the correct shaft due to a screw mechanism driven by a flywheel. The stroke is ±100 mm. Mounted on the front of the machine. The dressing consists of a frame, a bracket, a screw mechanism, a gearbox with a gear mechanical transmission, and a flywheel.
Automatic dressings ensure the movement of the straightening shaft due to rubber-cord pneumocylinders. The stroke is ±50 mm. The dressing mechanism works automatically when the air pressure in the cylinders changes, which is controlled by the mesh position sensor. It consists of a frame, a bracket, air springs, a guide.
Combined edits provide movement of the straightening shaft both in manual and automatic mode. With manual control (from the handwheel), the automatic straightening with the correcting roller is moved.
Structurally, automatic and manual edits are combined in one unit and installed on the front side of the machine. This achieves the best conditions for maintenance and control of the mesh or felt. Consists of parts that are part of manual and automatic edits, combined into one node.
All dresser parts are made of gray cast iron and stainless steel.
A pneumatic sensor with a paddle and a pneumatic circuit are part of the control.
The executive body is made in the form of a pneumatic regulator, which, based on the sensor pulses, moves the drive roller. The role of the sensor is performed by a blade, by moving which the input of pressure air into individual pneumatic cushions of the pneumatic regulator is controlled. The scapula deviates to the left or to the right from the central equilibrium position. The sensor is installed in the middle equilibrium position during installation.
Mesh tension is one of the main prerequisites for high-quality operation of the PM mesh part. As a result of insufficient mesh tension, the drive shaft begins to slip and, as a result, more wear occurs on both the mesh and the shafts. For high-quality operation of the mesh, which lengthens during use, it is necessary to provide the mesh part with the opportunity to compensate for the elongation of the mesh. Mesh tensioning devices are designed for this purpose.
Net tensioners are installed on the bottom branch of the net, inside or outside it, and are attached to the longitudinal beams of the net table or to the tires of the machine. They create a mesh tension of up to 8 kN/m by moving the mesh drive shaft.
The mesh tension design provides for the possibility of installing a scraper and a spray to clean the surface of the tension mesh drive shaft. The mesh tension consists of levers, a connecting shaft, brackets and drive units (pneumatic cylinders). Mesh material: gray cast iron, stainless steel.