Medium Consistency Screen-paper Pulp Processing Machine

Product introduction:

ZNS-type medium-consistency screen is a kind of pulp screening equipment, a new generation of medium-consistency screening equipment developed by the company. It is suitable for thermal screening of wood pulp or straw pulp; coarse screening or fine screening of chemical pulp and waste paper pulp; screening of preheated wood chip groundwood pulp, etc. The medium-consistency pressure screen is more adaptable, energy-saving, Features such as water saving and production efficiency.

Structure principle
The pressure screen is composed of a body, a cover, a screen drum, a rotating drum, a base, and a transmission part. The parts in contact with the slurry are made of stainless steel.

The pressure screen has a vertical structure with a cylindrical shell and a removable top cover on the top. All necessary connecting pipe flanges are installed on the shell. The screen body and the motor frame are bolted to the base. A round screen drum is installed inside, a rotor and a bearing are installed inside the screen drum, and the main shaft of the screen adopts a mechanical seal.

The pipe end bracket is set close to the rack. Connect the sealing water and bearing lubrication to the seal and bearing respectively.

1. Shell part

The main body of this machine is welded with stainless steel plates. There is a ring seat inside to install the screen drum and the transmission bearing on the bottom plate of the shell. The upper part has a tangential slurry inlet pipe and the lower part has a good slurry outlet pipe. There are slag discharge pipe and dilution pipe at the bottom, and the whole shell is fixed on the base with bolts.

2. Top cover

The top cover is a stainless steel ball-shaped head connected to the shell with bolts, and the center part is equipped with a valve joint, which serves as the residual gas in the discharge machine and possible light impurities.

3. Sieve drum

The screen drum has two structural forms: plate wave screen drum and bar wave screen drum.

The sieve plate of the plate corrugated screen drum is made of stainless steel, and has two types: perforated and slit. There are corrugated grooves on the surface of the sieve plate in contact with the slurry. Its effect is to enable the fibers to easily pass through the sieve holes (slits) and effectively separate qualified fibers from impurities and fiber clusters, thereby improving the screening efficiency and obtaining high quality Of pulp. The sieve plate is drilled or milled and the surface is polished. The surface of the sieve drum has a high smoothness. The outer surface of the sieve drum is welded with a strengthening ring to make the sieve drum have sufficient strength and rigidity; the upper end has a flange and bolts to the cylinder body The upper and lower ends are located in the cylinder body, the combination is firm and the operation is stable.

The structure of the bar wave screen drum consists of hundreds of special wedge-shaped bars, which are evenly embedded in the grooves on the circumference of the multi-layer annular plate along the circumferential direction. The upper end is a flange surface, which is connected to the cylinder, and the lower end is a cone. The surface of the screen drum is wavy, the screen gap can be more refined than the plate milling structure, the precision is higher, the opening rate is obviously increased, the strength of the bar is greatly improved than the milling screen, especially after the surface is hardened , The sieve drum has a longer service life and is an advanced structure in the world today.

4. Spin the drum

The rotating drum is a cylindrical body with a number of reasonably arranged bumps on the outer surface. High-frequency pulses are generated during high-speed rotation to screen the slurry and purify the screen holes.

The seal of the rotor shaft adopts a mechanical seal. In order to prevent the slurry from leaking or entering the transmission chamber, the machine is equipped with a mechanical seal and a sealed water pipe interface. The water pressure is required to be higher than the slurry inlet pressure by about 0.1Mpa.

5. Drive device

The rotor shaft is supported on a bearing seat and is driven by a motor through a set of narrow V-shaped belts. The lubrication device is installed on the base of the frame to regularly lubricate the bearings.