阅读说明：本技术 压力筛 (Pressure screen ) 是由 杨成军 于 2019-02-21 设计创作，主要内容包括：本发明公开了一种压力筛,包括外壳体(1),外壳体(1)内依次套设有筛鼓(2)和转子(3),外壳体(1)与筛鼓(2)之间形成第一环形空间,筛鼓(2)与转子(3)之间形成第二环形空间,外壳体(1)上设有进浆排渣总成(4)和良浆口(5),进浆排渣总成(4)上设有进浆口(41)和排渣口(42),进浆口(41)和排渣口(42)均与该第二环形空间连通,良浆口(5)与该第一环形空间连通。该压力筛采用了同侧进浆和排渣的设计,极大的提高了筛选效率。(The invention discloses a pressure screen which comprises an outer shell (1), wherein a screen cylinder (2) and a rotor (3) are sequentially sleeved in the outer shell (1), a first annular space is formed between the outer shell (1) and the screen cylinder (2), a second annular space is formed between the screen cylinder (2) and the rotor (3), a slurry inlet and slag discharge assembly (4) and a good slurry port (5) are arranged on the outer shell (1), a slurry inlet (41) and a slag discharge port (42) are arranged on the slurry inlet and slag discharge assembly (4), the slurry inlet (41) and the slag discharge port (42) are both communicated with the second annular space, and the good slurry port (5) is communicated with the first annular space. The pressure screen adopts the design of slurry inlet and slag discharge at the same side, thereby greatly improving the screening efficiency.)

1. The utility model provides a pressure screen, a serial communication port, pressure screen includes shell body (1), the cover is equipped with screen cylinder (2) and rotor (3) in proper order in shell body (1), form first annular space between shell body (1) and screen cylinder (2), form the second annular space between screen cylinder (2) and rotor (3), be equipped with into thick liquid on shell body (1) and arrange sediment assembly (4) and good thick liquid mouth (5), it is equipped with into thick liquid mouth (41) and row's cinder notch (42) on arranging sediment assembly (4) to advance thick liquid mouth (41) and row's cinder notch (42) all communicate with this second annular space, good thick liquid mouth (5) and this first annular space intercommunication.

2. The pressure screen according to claim 1, characterized in that a dividing member (43) is arranged in the slurry inlet and slag discharge assembly (4), the slurry inlet and slag discharge assembly (4) is divided into a slurry inlet area (44) and a slag discharge area (45) by the dividing member (43), the slurry inlet (41) is communicated with the second annular space through the slurry inlet area (44), the slag discharge port (42) is communicated with the second annular space through the slag discharge area (45), and the slurry inlet area (44) and the slag discharge area (45) are adjacent to each other along the circumferential direction of the rotor (3).

3. The pressure screen according to claim 2, characterized in that the slurry inlet and slag discharge assembly (4) comprises a strip-shaped shell (46), a slurry inlet pipe (47) and a slag discharge pipe (48) are connected outside the strip-shaped shell (46), the slurry inlet area (44) and the slag discharge area (45) are both positioned in the strip-shaped shell (46), the length direction of the strip-shaped shell (46) is parallel to the central line direction of the rotor (3), and the slurry inlet and slag discharge assembly (4) and the good slurry port (5) are positioned at two sides of the outer shell (1) along the circumferential direction of the rotor (3).

4. The pressure screen according to claim 1, characterized in that the screen cylinder (2) comprises two half screen cylinders (21), the two half screen cylinders (21) are mirror images of each other, the cross section of the half screen cylinder (21) is semicircular, and one end of each of the two half screen cylinders (21) is connected with the slurry and slag discharging assembly (4) along the circumferential direction of the screen cylinder (2);

or one side of the screen cylinder (2) is provided with a strip-shaped notch (25) for installing the slurry inlet and slag discharge assembly (4).

5. A screen press as claimed in claim 4, characterized in that, when the screen cylinder (2) comprises two half-screen cylinders (21), the half-screen cylinders (21) comprise a plurality of mutually independent small screen bars (22) in the axial direction of the screen cylinder (2), an annular dividing plate (24) is arranged between two adjacent small screen bars (22), and the screen cylinder (2) is divided into a plurality of annular screening zones by the dividing plate (24).

6. A pressurized screen according to claim 1, characterized in that the rotor (3) has a plurality of rotor sections on its outer surface in the axial direction of the rotor (3), that a retaining ring (33) is arranged between two adjacent rotor sections, and that the screen cylinder (2) is divided by the retaining ring (33) into a plurality of annular screening zones.

7. Pressure screen according to claim 6, characterized in that the rotor segments are provided with a plurality of rotors (31) on their outer surfaces in the circumferential direction of the rotor (3), the rotors (31) of two adjacent rotor segments are staggered, the rotors (31) are fixed to the rotor (3) by bolts, and spacers are provided between the rotors (31) and the rotor (3).

8. A pressure screen according to claim 5, characterized in that a screen cylinder support bar (6) is arranged in the outer casing (1), the screen cylinder support bar (6) is located between the rotor (3) and the good pulp opening (5), and the other ends of the two half screen cylinders (21) are connected with the screen cylinder support bar (6).

9. The pressure screen according to claim 1, characterized in that the center line of the rotor (3) is horizontal, the slurry inlet and slag discharge assembly (4) is positioned at the upper part of the outer shell (1), the good slurry port (5) is positioned at the lower part of the outer shell (1), the slurry inlet and slag discharge assembly (4) comprises a strip-shaped shell (46), the strip-shaped shell (46) is connected with a plurality of slurry inlet pipes (47), and the slurry inlet pipes (47) can divide the slurry inlet into a plurality of slurry inlet areas.

10. The pressure screen according to claim 1, characterized in that the central line of the rotor (3) is vertical, the slurry inlet and residue discharge assembly (4) and the good pulp port (5) are positioned at two sides of the outer shell (1) along the circumferential direction of the rotor (3), the slurry inlet and residue discharge assembly (4) comprises a strip-shaped shell (46), the strip-shaped shell (46) is connected with a plurality of slurry inlet pipes (47), and the slurry inlet pipes (47) can divide the slurry inlet into a plurality of slurry inlet areas.

Technical Field

The invention relates to the field of papermaking equipment, in particular to a pressure screen.

Background

The existing pressure screen technology adopts an upflow or downflow structural design of bottom or top slurry inlet, bottom heavy slag discharge and top or bottom light slag discharge, air in sticky materials, light impurities and slurry is discharged from a slag discharge port at the top or bottom, and the structure of the pressure screen is composed of a pressure screen base, a motor, a belt pulley, a transmission system, a pressure screen rotor, a rotor wing, a screen drum, a pressure screen shell, a slurry inlet pipe, a good slurry pipe, a slag discharge pipe and a heavy impurity collecting discharge port. The method is divided into a coarse sieve and a fine sieve according to the difference of removing impurities and achieving cleanliness; the invention is mainly directed to the innovation of the outward flow screen at present, and therefore the outward flow screen is explained.

After entering the pressure screen from the good pulp pipe, the pulp firstly enters the inside of the screen cylinder, the screen cylinder is assembled by a plurality of bar-shaped bars and a plurality of drum rings, and the drum rings mainly play roles in fixing the bars and reinforcing the bars. The gaps between the bars are divided into coarse screen cylinders with the size of about 0.6mm and fine screen cylinders with the size of 0.1mm-0.3 mm. The clean fiber that can pass through the clearance between the stick gets into behind the good thick liquid district through the screen cylinder from good thick liquid mouth discharge pressure sieve under the effect of pressure differential, and impurity and the sticky thing that are greater than the screen cut can remove to row's sediment direction gradually, follow row's sediment pipe discharge pressure sieve at last, and the heavy sediment is collected the discharge pressure sieve by heavy sediment collection mouth after rotatory along screen cylinder inner wall outward flange because of the effect of centrifugal force. The fibre can be in the stick department of screen cylinder constantly the bridging flocculation, slowly blocks up the screen cut, and the rotor of pressure sieve can produce a negative pressure in rotatory for the part is backflushed back through the good thick liquid backward flow of screen cylinder, thereby the flocculation and the bridging of dispersion and reduction fibre avoid blockking up the screen cut.

The outflow type pressure screen is characterized in that a pulp inlet pipe is positioned at the bottom or the top of the pressure screen, after pulp enters the pressure screen, fibers, water, impurities smaller than screen gaps and stickies enter a good pulp area through a screen drum, and the pulp and large impurities move towards a slag discharge port. In the screening process, as water can more easily pass through the screen slots, the concentration phenomenon inevitably occurs in the whole length of the screen frame from pulp inlet to slag discharge in the screening process. In the past, in order to solve the phenomenon, only a certain amount of dilution water is added into the screen body, but the mixing of the pulp and the water is poor because of small space. Since the pulp is continuously thickened from pulp feeding to pulp discharging, the flow rate and yield of good pulp are reduced along with the thickening. Thus, only a part of the screen cylinder is utilized effectively.

This presents several problems:

1. due to the fact that the concentration of the slurry is continuously increased, the screening efficiency is continuously changed, the yield is high in the initial stage, but most of water can rapidly pass through the screen cylinder, the passing speed is high, the adhesive can be more easily deformed to pass through the screen cylinder under the condition of high flow rate, and the screening efficiency is reduced;

2. the concentration of the slurry at a small part of the screen cylinder and the flow speed of the slurry passing through the screen cylinder are in the best state, the yield and the screening efficiency are in the better state, but the concentration only accounts for about 1/3-1/4 of the screen cylinder, and the efficiency of the screen cylinder is not effectively exerted;

3. along with the increase of the concentration, the fibers are easy to bridge, so that the screening area is blocked, the screening capacity is reduced, and in order to prevent the situation, the rotating speed of a rotor wing of the pressure screen is in a higher level to generate larger back washing pulse for cleaning the screen drum, so that the kinetic energy consumption is increased;

4. also, in order to avoid the fibers from blocking the screen cylinder at a higher concentration, the corrugation height of the bars of the screen cylinder is made higher, so that a larger turbulent flow is generated, but the larger turbulent flow can make part of stickies pass through the screen cylinder more easily, and the screening efficiency is reduced;

5. the increase of the concentration causes the slurry in the latter half section of the screen cylinder to be more difficult to pass through the screen cylinder, so that the effective area of the screen cylinder above 1/3 is not utilized, and the yield is reduced;

6. the concentration rise will make the slag discharge rate higher than the ideal state;

7. the sticky thing rises or descends (rising and falling stream pressure sieve is different) along the rotatory spiral of screen cylinder inner wall, and sticky thing or impurity will rotate a lot of circles and just can discharge, because the sticky thing is deformable, will have like this a lot of chances to get into the good thick liquid side through the screen cylinder to reduce screening efficiency.

The noun explains:

pulp: pulp is a suspension of fibers for paper making, which is obtained by dispersing and dissociating plant fiber materials such as wood, cotton, and the like into fibers for paper making by a mechanical or chemical method.

Adhesive substance: also called stickies, are generally considered to be stickies derived from recycled fibers, and are mostly negatively charged. Which may be used as a collective term to refer to materials that are derived from different sources and that are permanently or temporarily tacky and can cause problems and degrade product quality during the papermaking process. The stickies are mainly derived from various organic matters in waste paper, such as pressure-sensitive matters, hot melts, coating stickies, sizing agents, ink residues and the like. Stickies can be classified into PSA (pressure sensitive adhesive), hot melt adhesive and a small amount of wax according to their chemical composition. The PSA comprises styrene-butadiene rubber (SBR), acrylic styrene, and polyvinyl alcohol (PVA)/Acrylate (ACRY). Hot melts are typically composed of vinyl acetate polymers, copolymers, tackifiers, and tackifying resins. Waxes are typically used as binder melting point modifiers. All three substances have hydrophobic properties.

Disclosure of Invention

In order to improve the screening efficiency of paper pulp, the invention provides the pressure screen, which adopts the design of feeding pulp and discharging slag at the same side, thereby greatly improving the screening efficiency.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a pressure screen, includes the shell body, and the cover is equipped with screen cylinder and rotor in proper order in the shell body, forms first annular space between shell body and the screen cylinder, forms the second annular space between screen cylinder and the rotor, is equipped with into thick liquid on the shell body and arranges sediment assembly and good thick liquid mouth, advances to be equipped with into thick liquid mouth and row's cinder notch on arranging the sediment assembly, advances thick liquid mouth and row's cinder notch all with this second annular space intercommunication, good thick liquid mouth and this first annular space intercommunication.

A partition part is arranged in the slurry inlet and slag discharge assembly, the slurry inlet and slag discharge assembly is divided into a slurry inlet area and a slag discharge area by the partition part, the slurry inlet is communicated with the second annular space through the slurry inlet area, the slag discharge opening is communicated with the second annular space through the slag discharge area, and the slurry inlet area and the slag discharge area are adjacent along the circumferential direction of the rotor.

The slurry inlet and slag discharge assembly comprises a strip-shaped shell, a slurry inlet pipe and a slag discharge pipe are connected outside the strip-shaped shell, a slurry inlet area and a slag discharge area are both positioned in the strip-shaped shell, the length direction of the strip-shaped shell is parallel to the central line direction of the rotor, and the slurry inlet and slag discharge assembly and the good pulp port are positioned on two sides of the shell along the circumferential direction of the rotor.

The screen cylinder comprises two half screen cylinder bodies which are mirror images, the cross section of each half screen cylinder body is semicircular, and one end of each half screen cylinder body is connected with the slurry inlet and slag discharge assembly along the circumferential direction of the screen cylinder; or, one side of the screen cylinder is provided with a strip-shaped notch for installing the slurry inlet and slag discharge assembly.

When the screen cylinder contains two half screen cylinder bodies, the half screen cylinder bodies contain a plurality of mutually independent small screen cylinder strips along the axial direction of the screen cylinder, an annular partition plate is arranged between every two adjacent small screen cylinder strips, and the screen cylinder is partitioned into a plurality of annular screening areas by the partition plate.

Along the axial of rotor, the surface of rotor contains a plurality of rotor sections, and adjacent two be equipped with the retaining ring between the rotor section, the screen cylinder is separated into a plurality of annular screening districts by the retaining ring.

Along the circumference of rotor, the surface of this rotor section is equipped with a plurality of rotors, and the rotor staggered arrangement on two adjacent this rotor sections, the rotor is fixed on the rotor by the bolt, is equipped with the gasket between rotor and the rotor.

Still be equipped with the screen drum support bar in the shell body, the screen drum support bar is located between rotor and the good thick liquid mouth, and the other end of two half screen drum bodies all is connected with the screen drum support bar.

The central line of rotor is horizontal state, advances thick liquid row sediment assembly and is located the upper portion of shell body, and the good thick liquid mouth is located the lower part of shell body, advances thick liquid row sediment assembly and contains the bar casing, and the bar casing is connected with a plurality of thick liquid pipes that advance, advances thick liquid pipe and can will advance thick liquid and separate for a plurality of thick liquid areas.

The central line of rotor is vertical state, along the circumference of rotor, advances thick liquid and arranges sediment assembly and good thick liquid mouth and be located the both sides of shell body, advances thick liquid and arranges sediment assembly and contain the bar casing, and the bar casing is connected with a plurality of thick liquid pipes that advance, advances thick liquid pipe and can will advance thick liquid and separate for a plurality of thick liquid areas.

The invention has the beneficial effects that: the pressure screen adopts the design of slurry inlet and slag discharge at the same side, thereby greatly improving the screening efficiency.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a front view of the pressure screen described in example 1.

Figure 2 is a top view of the pressure screen described in example 1.

Fig. 3 is a left side view of the pressure screen described in example 1.

Fig. 4 is a perspective view of the pressure screen described in example 1.

Fig. 5 is a sectional view taken along a-a in fig. 1.

Fig. 6 is a sectional view taken along the direction B-B in fig. 1.

Fig. 7 is a sectional view taken along the direction C-C in fig. 3.

FIG. 8 is a front view of the slurry and slag discharging assembly in example 1.

FIG. 9 is a top view of the slurry and slag discharge assembly of example 1.

Fig. 10 is a sectional view taken along the direction D-D in fig. 8.

Fig. 11 is a sectional view taken along the direction E-E in fig. 9.

Figure 12 is a schematic perspective view of a screen cylinder in example 1.

Figure 13 is a schematic perspective view of a small screen cylinder strip in example 1.

Fig. 14 is a schematic perspective view of the rotor in embodiment 1.

Fig. 15 is a front view of the pressure screen described in example 2.

Figure 16 is a top view of the pressure screen described in example 2.

Fig. 17 is a left side view of the pressure screen described in example 2.

Fig. 18 is a perspective view of the pressure screen described in example 2.

Fig. 19 is a sectional view taken along the direction F-F in fig. 17.

Fig. 20 is a sectional view taken along the direction G-G in fig. 17.

Fig. 21 is a schematic perspective view of a rotor in embodiment 2.

Figure 22 is a schematic perspective view of a screen cylinder in example 2.

1. An outer housing; 2. a screen cylinder; 3. a rotor; 4. a slurry feeding and slag discharging assembly; 5. a good pulp opening; 6. a screen cylinder support bar;

21. a half-screen drum body; 22. small screen cylinder bars; 23. a drum ring; 24. dividing the plate; 25. a strip-shaped notch;

31. a rotor; 32. a main shaft; 33. a retainer ring;

41. a pulp inlet; 42. a slag discharge port; 43. a dividing member; 44. a pulp inlet area; 45. a slag discharge area; 46. a strip-shaped housing; 47. a pulp inlet pipe; 48. a slag discharge pipe.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.