JPH0229790B2 - KAMIPARUPURUINODATSUSUISENJONOSHUKUSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of automatically dewatering and extracting paper pulp from a relatively dilute slurry-like raw material solution prepared by diluting paper pulp with water, and concentrating the paper pulp to a predetermined concentration. The present invention relates to a device for obtaining the same condition.

Conventionally, this type of equipment has been designed by rotating a cylinder, the outer layer of which is covered with a porous water-permeable wall, immersed in a slurry-like stock liquid, and using the water head pressure in the raw material tank to direct the paper stock liquid through the outer wall of the cylinder and into the cylinder. By press-fitting, the paper pulp is coated with the outer layer, water is leached into the cylinder and retained in a specific waterway, and the water retained in the waterway is discharged by rotation of the cylinder, and when it is released. The negative pressure inside the water retaining section causes suction to suck outside air through the adhesion layer of paper pulp attached to the outer layer of the cylinder, and the automatic suction action dehydrates the water in the adhesion layer, and the dehydration action also causes cleaning. The layer of paper pulp that adheres to the outer layer of the cylinder along with the action is taken out in a concentrated state to a predetermined concentration, and dehydrated, washed, and concentrated.
The purpose of the present invention is to further improve the work efficiency by making the cleaning and concentration processing by dehydration in such equipment more effective. A large number of annular waterways are arranged in parallel in the axial direction of the cylinder, and each annular waterway is divided into three water retention ports of approximately equal length by a partition plate, and the front end of each water retention port in the rotational direction of the cylinder is connected to the cylinder wall. A cylinder in which water supply openings provided in the outer layer communicate with the outside of the cylinder through a porous water passage wall in the outer layer, and the rear end of each water retention port communicates with the inside of the cylinder through drainage openings provided in the wall forming a water channel. In a device in which the raw material liquid for paper pulp is immersed and rotated in a raw material tank that always holds a constant water level, it is bent from the inner end of each partition plate that partitions the water retention ports in each waterway toward each drainage opening side. The first invention is characterized in that by providing a projecting wall plate, a water seal is formed by a water reservoir that submerges a drainage opening by the partition wall plate and the projecting wall plate, and further, the water seal is formed on the inner circumferential surface of the cylinder. Water is supplied by a projecting wall plate that extends inward from the bulkhead plate that divides the inside of the waterway into three approximately equal length water retention ports, and a bottom wall plate that connects the extended end to the inner wall plate that forms the waterway. A second aspect of the present invention is that a water receiving portion facing the opening is formed.

Embodiments of the present invention will be described with reference to the drawings.

Figures 1 to 3 show conventional devices.
is a cylinder, on its outer surface, a large number of axially long strips 2 are provided radially protruding along the circumferential direction at small intervals of appropriate width, and on its outer surface are punching plates 3 and further on its outer surface are punching plates 3 and A mesh wire mesh plate 4 is attached, and a punching plate 3 and a wire mesh plate 4 are attached.
A porous water passage wall is formed as the outer layer of the cylinder 1, and a large number of water passages 5 along the axial direction of the cylinder 1 are formed on the outer periphery of the cylinder 1 by the spacing between the porous water passage wall and the strip 2. Formed.

A large number of flange-shaped annular wall plates 6 protruding inward are installed in the cylinder 1 at appropriate intervals along the axial direction of the cylinder 1, and the inner circumferential surface of the spaced parts is closed with an inner wall plate 7. A large number of annular water channels 8 are formed by the spaced portions of the annular wall plates 6.

In the illustrated embodiment, in order to provide a support mechanism for the rotation shaft 9 of the cylinder 1, 12 annular water channels 8 are arranged in parallel in the axial direction in the middle of the inner circumference of the cylinder 1, leaving both sides inside the cylinder 1. The bases of supporting arms 10 of the rotating shaft 9 are fixed to both ends, but it goes without saying that the number of water channels 8 can be increased or decreased depending on the length of the cylinder 1.

The annular water channels 8 formed along the inner periphery of the cylinder 1 as described above are separated from each other by three partition plates 11 into three water retention ports 8a, 8b, 8c of approximately equal length. The front ends of the ports 8a, 8b, and 8c are water supply openings 1 provided in the outer wall plate forming the cylinder 1.
2 communicates with the outside of the cylinder 1 through the porous water walls 3 and 4 of the outer layer, and each water retention port 8a,
The rear ends of 8b and 8c are connected to the cylinder 1 by drainage openings 13 provided in the inner wall plate 7 forming the annular waterway 8.
Water in a large number of water passages 5 formed inside the outer layer of the cylinder 1 flows into the water supply opening 12 and into each port 8a, 8b, 8c.

Note that the water supply openings 12 and drainage openings 13 in each port are arranged at different positions in the circumferential direction for each annular waterway 8 so as to be uniformly distributed on the surface of the cylinder 1, as shown in FIG. 1, for example. Ta.

Also, the outer wall plate of the cylinder 1, the water passage 5 formed by the strip 2 and its spacing, the porous water passage walls 3, 4 of the outer layer, the annular water passage 8 formed by the annular wall plate 6 and the inner wall plate 7, the partition plate 11,
The relationship between the water supply opening 12 and the drainage opening 13 is shown in detail in FIG.

The cylinder 1 configured as above is the raw material tank 1.
The lower half of the cylinder 1 is immersed in the tank 14, and the open ring-shaped ridge 1a formed on one side of the cylinder 1 is inserted into the tank 14.
The connecting ring 15 abuts against the inner ring-shaped protrusion 14a.
The raw material tank 1
4 contains relatively diluted slurry-like paper stock liquid a obtained by diluting paper pulp so as to maintain a constant water level at all times, and a communication port 17 protrudes outward from the ring-shaped projecting wall 14a of the tank 14. level adjustment box 1
8, and by adjusting the weir plate 19 in the box 18, the white water surface b of water penetrating into the cylinder 1 can be freely set.

Reference numeral 20 indicates a drain port, and reference numeral 21 indicates a footrest for the raw material tank 14.

In addition, a roll 22 and a guide plate 23 for peeling paper pulp A attached to the outer surface of the cylinder 1 are provided close to the outer upper part of the cylinder 1 immersed in the raw material tank 14, and the peeled paper pulp A is transferred to the processing tank. 24
After being accommodated in the container, the materials are transported to a predetermined location outside the apparatus using, for example, a screw conveyor 25 or the like.

In this device, a cylinder 1 is placed in a raw material tank 14.
When the is rotated in the direction of the arrow shown in FIG. Liquid A is forced into the cylinder through the porous water walls 3 and 4, and paper pulp A is deposited on average on the outer surface of the porous water walls 3 and 4 in the portion immersed in the raw material liquid, and the water is flows into the water holding port of each annular water channel 8 from the water supply opening 12 which flows axially following the water flow channel 5 .

In this case, for example, as shown in the fourth diagram, the water retention port 8
The water supply opening 12 of a is located at the white water level b, and the water holding port 8b is already immersed in the liquid at the white water level b, so the port 8b is filled with white water that has entered from the water supply opening 12. , water retention port 8c
Since the drainage opening 13 has been moved to a position above the white water surface b, the water that had been filled in the port 8c has been discharged. The positional relationship of these three ports changes sequentially and alternately as the cylinder 1 rotates.
In addition, 12 annular water channels 8 formed inside the cylinder 1...
The rotational phases of each port are also shifted from each other, and the inside of the port is filled with water, and then the water discharge state is repeated.

Now, in FIG. 4, when the water retention port 8b rotates from this state and the water supply opening 12 moves toward the raw material liquid a side, the water column in the port is moved downward by gravity and the siphon effect due to the water level difference inside and outside the cylinder. Water is gradually discharged from the drain opening 13 of the drain opening 13 and descends, creating a negative pressure in the port above the water. However, when the water supply opening 12 is below the surface of the raw material liquid A, the negative pressure causes the opening 12 to However, when the opening 12 moves to the atmosphere above the liquid level a, the water level in the port decreases, causing a negative pressure on the water head surface, which causes a suction force. The water contained in the paper pulp layer A adhering to the outer surface of the cylinder through the opening 12 is sucked and dehydrated, and at the same time, a slight amount of air is sucked through the layer A. This suction operation is carried out through the lower drainage opening 13 of the port 8b. moves upward from the white water surface b and air enters the port from the opening 13. After this continues until the negative pressure in the port collapses, all the water in the port is removed, as shown by the water retention port 8c in the same figure. Water will be released.

In addition, the suction dewatering operation due to negative pressure accompanying water discharge from the water retention port 8b is performed at the port belonging to the water supply opening 12 that has moved from the liquid level a to the upper atmosphere in each annular waterway 8. The paper pulp layer A attached to the surface is dehydrated uniformly in each part.

Considering the water retention port 8c in FIG. 4, which has completed suction dehydration through the above operating conditions, the attached paper pulp _layer A After the adhesion layer A is concentrated by suction dehydration, it is peeled off from the surface of the cylinder 1 by the peeling roll 22 by the subsequent rotation of the cylinder 1 and transferred to the next process. The raw material liquid level a with respect to the white water level b is _H1 , and the head pressure is relatively high, so the adhesion rate of paper pulp A to the cylinder 1 is good, but the dehydration time is extremely short at x _~x1 , In order to increase the dehydration time, if the dehydration time is delayed and the white water level is raised to _b1 , the dehydration time will be longer from x to _x2 , but the head pressure _H2 will be lower and the adhesion layer A will be increased.
The adhesion rate decreases, and when the white water level is lowered to _b2 , the head pressure increases to _H3 , but the dewatering time is
It is clear that the length becomes significantly shorter as x ₃ .

Furthermore, when the dewatering time is increased to x~ _x2 as described above, when the drain opening 13 moves from the white water surface _b1 to the upper level, air enters the port 8c from the opening 13 at the rear end, causing internal negative pressure. The condition is destroyed and the inside of the water retention port 8c instantly becomes atmospheric pressure, and at this time, while the water supply opening 12 at the front end moves from x ₁ to x ₂ , as shown in FIG. The accumulated water is pushed out by the violent moving air current, flows out toward the opening 12, and infiltrates the adhesion layer of the paper pulp A that has already been dehydrated and washed, reducing the dehydration and cleaning effect. .

According to the present invention, when the head pressure is increased to improve the adhesion rate of paper pulp A to the cylinder 1, the dewatering and washing time is shortened, and on the other hand, when the dehydration and washing time is increased, the head pressure is increased. As a result, the adhesion rate of paper pulp A to the cylinder 1 deteriorates, and furthermore, during dewatering and cleaning, the water in the waterway flows out toward the water supply opening due to air entering the waterway, and the cylinder 1 finishes dewatering and washing. It eliminates the inconvenience of rewetting the adhesion layer of the surface, and partitions each annular waterway 8 into three approximately equal length water retention ports 8a, 8b, 8c, as shown in the embodiment of FIG. A protruding wall plate 30 is provided by bending the inner end of each of the plates 11 toward the drain opening 13 side, and the partition plate 11 and the protruding wall plate 30 form a water seal portion 31 by a water reservoir that submerges the drain opening 13. Features a composition.

Incidentally, it is a matter of course that the side surface of the water seal portion 31 formed by the protrusion of the projecting wall plate 30 is closed by the side plate 30a.

In the above configuration, as described above, even when the water retention port 8c is positioned above the white water surface b as shown in FIG. Therefore, as in the conventional case, the opening 13 does not communicate with the atmosphere at this position, and as the cylinder 1 further rotates in the direction of the arrow, the water in the port 8c gradually overflows from the projecting wall plate 30 and is discharged. As the water level falls during this time, the inside of the port is automatically made negative pressure, and the suction force performs a dewatering and cleaning action, and this action is performed by the protruding wall plate 30 as shown in FIG. This process continues until a gap is created between the tip edge and the water surface of the water seal portion 31 for air to enter.

Thus, as shown in Figure 10, a gap is created between the tip edge of the projecting wall plate 30 forming the water seal section 31 and the water surface of the water seal section 31, and when air enters the port, negative pressure within the port is created. is rapidly collapsed and the above-mentioned suction effect disappears, but the dehydration cleaning time from x to x ₂ is long, corresponding to the case where the white water level is raised to b ₁ in the conventional method, and the dehydration and cleaning is good. In addition, in this case, even if the white water level is lowered to _b2 , the drain opening 13 is blocked by the water seal part 31 and no air enters, so the head pressure can be set to the maximum value of H3, which is different from conventional drain openings ₁₃ . The head pressure equivalent to that of a large-diameter cylinder can be obtained, and the dehydration and cleaning time can be lengthened and the head pressure can be both increased compared to the conventional apparatus.

Also, as shown in FIG. 7, three ports 8a, 8
b, 8c, the projecting wall plate 30 extends from the inner end of the partition wall plate 11 as described above, or the projecting wall plate 30 extends linearly from the partition wall plate 11 as shown in FIG. 8. Inner wall plate 7 forming tip and water channel 8
A water receiving portion 33 is formed by recessing the tip of the inner wall plate 7 inwardly, facing the water supply opening 12 in each port.

Therefore, when the cylinder 1 rotates and the water supply opening 12 is located forward from the center of the cylinder and is at a lower position, the drain opening 13 of the port becomes higher than the white water level in the cylinder 1, and the water suddenly rises from the opening 13. When air enters the port and the negative pressure inside the port collapses, even if turbulent flow occurs due to the intruding air, the water remaining near the water supply opening 12, which is at a low level, is collected in the water receiving part 33 and the water surface is used for water supply. Since it is lower than the opening 12, the water does not flow out due to the turbulent air, and therefore, the water remaining at the upper lower level c of the port flows out toward the water supply opening 12 due to the turbulence, unlike in the conventional case, and the dewatering and cleaning process has already been completed. Without rewetting the adhesion layer on the cylinder surface with water, it is possible to prevent the concentration effect by dehydration and washing from being inhibited.

Furthermore, in this case, as shown in FIG. 10, by providing an external pressure device 34 such as a press roll device between x ₁ and x ₂ for pressing the adhering layer, the water that has permeated into the adhering material can be squeezed out again and the water that has permeated into the adhering material can be squeezed out. It cooperates with the water reduction prevention effect of the water section 33 to improve the dehydration process.

As described above, the first invention improves the adhesion efficiency of paper pulp to the cylinder by maximizing the head pressure in the cylinder, and also maximizes the dewatering and washing time to achieve a concentration effect, compared to the conventional one. According to the second invention, the water remaining in the upper lower part of the port is prevented from flowing toward the upper water supply opening even by the turbulence generated in the port at the end of the dewatering and washing operation, and the water dehydration and washing is already completed. This has the effect of dramatically improving the concentration processing ability by dehydration and washing without reducing the concentration effect by preventing the attached layer from becoming wet again with water.

[Brief explanation of drawings]

Figure 1 is a cutaway side view of a conventional device, and Figure 2 is a cross-sectional side view of a conventional device.
3 is a perspective view of the main parts,
4 and 5 are cutaway front views explaining the operation of a conventional device, FIGS. 6, 7, and 8 are cutaway front views of main parts showing an embodiment of the present invention, and FIGS. FIG. 10 is a cutaway front view illustrating the operation of the present invention. DESCRIPTION OF SYMBOLS 1... Cylinder, 3, 4... Cylinder outer layer, 5... Water passageway, 6... Annular wall plate, 7... Inner wall plate, 8... Annular waterway, 8a, 8b, 8c... Water retention port, 11... ...Partition plate, 12...Water supply opening, 1
3... Drain opening, 14... Raw material tank, 30... Projection wall plate, 31... Water seal section, 32... Bottom wall plate, 33...
Water receiving part, a... Raw material liquid, b... White water surface, c... Lower part, A... Paper pulp.

Claims (1)

[Claims] 1. A cylinder whose outer layer is covered with a porous water passage wall has a large number of annular water channels along the circumferential direction of the inner surface of the cylinder, arranged in parallel in the axial direction of the cylinder, and each annular water channel is surrounded by a partition plate. It is divided into three water retention ports of equal length, and the front end of each water retention port in the rotational direction of the cylinder is communicated with the outside of the cylinder through a water supply opening provided in the cylinder wall through a porous water passage wall in the outer layer. A cylinder whose rear end is connected to the inside of the cylinder through a drainage opening provided in a wall forming a waterway, and the cylinder is immersed and rotated in a raw material tank that always holds raw material liquid for paper pulp at a constant water level. In this method, a projecting wall plate is provided by bending from the inner end of each of the partition plates that partition the water retention ports in each waterway toward each drainage opening, thereby preventing water from pooling by submerging the drainage opening by the partition plate and the projecting wall plate. A dehydrating, washing and concentrating device for paper pulp, characterized in that a sealing portion is formed. 2 A large number of annular waterways are provided along the circumferential direction of the inner surface of the cylinder whose outer layer is covered with a porous water passage wall, and are arranged in parallel in the axial direction of the cylinder, and each annular waterway is lined with a partition plate with three approximately equal lengths. The front end of each water retention port in the rotational direction of the cylinder is connected to the outside of the cylinder via a porous water passage wall in the outer layer through a water supply opening provided in the cylinder wall, and the rear end of each water retention port is connected to a water channel. In a cylinder that is connected to the inside of the cylinder through a drainage opening provided in the wall forming the inside of the cylinder, the cylinder is immersed and rotated in a raw material tank in which raw material liquid for paper pulp is always kept at a constant water level. A projecting wall plate extends inward from the partition plate that divides the waterway formed on the circumferential surface into three approximately equal length water retention ports, and a bottom that connects the extended end to the inner wall plate that forms the waterway. A dewatering, washing and concentrating device for paper pulp, characterized in that a water receiving part is formed inside the wall plate facing a water supply opening.