PM8 100TPD yarn tube paper project complete pulping system
M6 was put into production in May 2009, with an annual production capacity of 270,000 tons. In order to adapt to the unstable source of raw materials and reduce energy consumption, it was decided to change the original D-type pulper to a drum pulper. PM7 is a production line with a speed of 1000m/min and a width of 6600mm. In order to maintain the original length of the recycled fiber, improve the separation effect of impurities and fibers, and reduce labor costs and strength, Yunda chose a drum pulper. PM8 is a core board production line with a 3200mm wide paper machine. It is mainly used to process waste from other preparation lines. Yunda provides PM8 with complete material preparation equipment.

1. Drum pulper
Outstanding advantages
A single machine can carry out continuous disintegration and preliminary coarse screening, which simplifies the subsequent purification and separation process.
The force to dissolve the fiber is relatively gentle, keeping the physical properties of the fiber to a maximum.
The disintegration residence time is long, the fiber is fully disintegrated, and the good fiber loss rate is less than or equal to 0.8%.
The power consumption is low and the operating cost is reduced. Basically no wearing parts, 7*24h continuous operation without shutdown, reducing maintenance costs.
The impurity crushing rate is low, and the slag discharge efficiency is high, which reduces the burden of subsequent processes.
Structure principle
The machine has a roller-shaped drum with simple structure and novel design. It is composed of an upper hopper, a rotating drum, a transmission device, a supporting wheel device, a blocking wheel device, a sealing device, a shield and a slurry tank. The outer wall of the drum is inlaid with two large supporting wheels and a large gear. The two large supporting wheels are supported by two groups of small supporting wheels respectively, and can rotate on the small supporting wheels. On both sides of the large supporting wheel on the pulp outlet side, there are a set of blocking wheel devices to prevent the axial displacement of the drum. The large gear on the outer wall of the drum is driven by the pinion of the transmission device to rotate the drum. The front part of the drum is the pulping zone, and the rear part is the screening zone. The feed port of the pulping area is connected with the upper hopper by a sealing device. The upper hopper is equipped with water inlet and medicine inlet pipe ports; the screening area has a protective cover, dilution water and a slurry tank. The waste paper enters the drum from the upper hopper, the pulp enters the slurry tank in the screening area through the pulping zone, and the impurities are discharged from the slag discharge port.

The dilution water comes from the spray pipe installed on the top of the drum, and is sprayed through the sieve plate at the top of the drum from the outside to the inside, so that the fibers that block the sieve can be backwashed back into the drum, which not only cleans the sieve but also flushes impurities Adhesive fibers on the top.
Parameters Table
Model ZDG250 ZDG275 ZDG300 ZDG325 ZDG350 ZDG375 ZDG400
Diameter: (mm) Φ2500 Φ2750 Φ3000 Φ3250 Φ3500 Φ3750 Φ4000
Capacity: (T/D) 70-120 140-200 200-300 300-400 400-550 550-720 750-1000
ZDGA motor power: (kW) 110 160 250 315 560 630 800
ZDGB motor power: (kW) 132 200 315 400 630 800 1000

2. Chain conveyor
Structure principle
The chain conveyor is composed of five parts: head drive device, tail wheel device, tension device, chain plate and frame.

1. Head drive
It consists of a motor, a reducer, a transmission device and a driving sprocket device. The power is transmitted to the main shaft through a pair of sleeve roller sprockets by the driving device, and then drives the groove plate to run. The active sprocket device uses two sprockets with 6 teeth to drive the two piece traction chains and the grooved plate to run along the guide rail.
2. Tail wheel device
The redirecting part of the chain plate of this machine is composed of a tail wheel shaft, two tail wheels and bearings.
3. Tensioning device
The tensioning device adopts a spiral tensioning method to adjust the tightness of the traction chain.
4. Chain plate part
It consists of traction chain and trough plate. The traction chain adopts a piece-type traction chain that is resistant to impact and runs smoothly and reliably. A roller is installed in the middle of the inner chain to roll on the track to reduce frictional resistance and wear. The trough plate is fastened together with the traction chain with bolts.
5. Rack
It is composed of headstock, tailstock and middle frame. It is welded with channel steel, angle steel and reinforced steel plate. There are four tracks for rollers in the middle of the frame, which are made of light rails.

Three, medium consistency sieve
It is suitable for the thermal screening of wood pulp or straw pulp; the coarse screening or fine screening of chemical pulp and waste paper pulp; the screening of preheated wood chip groundwood pulp, etc. The medium-consistency pressure screen is more adaptable, energy-saving, Features such as water saving and high production efficiency.
Advantage
Multi-wing block design, no winding, gentle pulse, clean screen slurry, high pulse frequency, large capacity;
Medium-concentration screening (Max. 4%) reduces the water consumption in the production process and has obvious energy-saving effects. The screen drum area of the same capacity is small, and the investment and maintenance costs are low.
The screening area is less concentrated, the screening efficiency is high, and the screen drum has a long life.
Equipped with automatic oil injection device and mechanical seal water flow monitoring device, reserved DCS interface (bearing temperature rise, vibration detection), high degree of automation.
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-type 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, which is the current international structure.

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.

Four, internal flow screen
working principle
The internal flow screen is a device that continuously selects materials under pressure in a completely closed state. During operation, the unscreened pulp under pressure enters the outside of the screen drum in a tangential direction from the pulp inlet pipe on the upper part of the machine body, with the help of the inside and outside of the screen drum. The pressure difference, the qualified pulp enters the screen drum through the screen slit (hole) under pressure, and is led out from the good slurry pipe at the bottom. The impurity of the slurry machine that cannot pass through the screen slit (hole) drops to the bottom and is discharged from the slag discharge pipe . The rotating fins on the outside of the screen drum can generate a gentle pressure to further improve the annular flow of the pulp, and generate negative pressure from the tail to backwash the screen slits (holes). It can prevent the screen slits (holes) from being blocked, so that the slurry can pass through the screen slits (holes) smoothly to ensure the continuous operation of the screening.