High-efficiency pulp impurity removal rotor

Abstract

The present invention discloses a high-efficiency pulp impurity removal rotor, belonging to the field of special equipment for pulp and paper making. Its structure includes a rotor body and blades. The rotor body includes a cylinder body, an upper support plate, a lower support plate and a rotor seat. The rotor seat is arranged in the middle of the cylinder body. The upper and lower parts of the rotor seat are respectively connected to the cylinder body through the upper support plate and the lower support plate. The blades include multiple rows and are respectively arranged on the outer surface of the cylinder body. The gap between the blades and the sieve drum gradually increases from the slag discharge side to the feed side. A plurality of slots are opened on the lower support plate, and a material guiding plate is arranged at each slot. The upper part of the material guiding plate is connected to the upper support plate, and the lower part is arranged in the slot. A diversion hole is opened at the corresponding position of the cylinder body outside the material guiding plate, and the diversion hole is communicated with the slot, so as to form a feed channel among the lower support plate, the material guiding plate, the upper support plate and the diversion hole. One side of the material guiding plate is inclined along the rotation direction of the rotor body. The high-efficiency pulp impurity removal rotor of the present invention has the characteristics of reducing energy consumption, improving the quality of good pulp and production capacity, etc.

Description

Technical Field

[0001] The present invention relates to the field of special equipment for pulp and paper making, and in particular to a high-efficiency pulp impurity removal rotor. Background Art

[0002] In order to ensure good cleaning effect of the screen drum and generate strong enough suction force, the conventional pressure screen rotor must maintain a high rotational speed, which results in high energy consumption of the pressure screen. Due to the high rotational speed, the positive pressure of the rotor blades on the screen drum is large, which easily breaks or squeezes impurities into deformation and passes through the screen drum, resulting in a decline in the quality of the pulp. Since water is more likely to pass through the screen drum than the fibers in the pulp, the inevitable thickening phenomenon occurs during the screening process. At the end of the screening area, impurities are enriched and have a high concentration. The conventional pressure screen rotor cannot effectively clean the screen drum, resulting in almost no pulp passing through this part of the screen drum, wasting the pulp passing area of the screen drum in vain. In this case, the pulp passing flow rate on the feed side is very high, while the pulp passing flow rate on the slag discharge side is very low, or even no pulp passes through, resulting in the extrusion of deformable adhesives and hard impurities close to the screen drum slit width in the area with a high flow rate through the screen drum, and the quality of the good pulp passing through the screen drum declines.

[0003] The gap between the blades of the conventional pressure screen rotor and the screen drum is small and the upper and lower gaps are the same. Generally, the smaller the gap, the higher the energy consumption. However, the pulp concentration on the feed side is low and does not require a large amount of energy to clean the screen drum. Too small a gap leads to unnecessary energy consumption and easily squeezes impurities through the screen drum, resulting in a decline in the quality of the good pulp. Summary of the Invention

[0004] The technical task of the present invention is to provide a high-efficiency pulp impurity removal rotor for the above-mentioned deficiencies in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is: it includes a rotor body and blades. The rotor body includes a cylinder, an upper support plate, a lower support plate and a rotor seat. The rotor seat is arranged in the middle of the cylinder. The upper and lower parts of the rotor seat are respectively connected to the cylinder through the upper support plate and the lower support plate. The blades include multiple rows and are respectively arranged on the outer surface of the cylinder. The gap between the blades and the screen drum gradually increases from the slag discharge side to the feed side. A plurality of slots are opened on the lower support plate, and a deflector is arranged at each slot. The cross-sectional shape of the deflector is the same as the shape of the slot. The upper part of the deflector is connected to the upper support plate, and the lower part is arranged in the slot. A diversion hole is opened at the corresponding position of the cylinder outside the deflector, and the diversion hole is communicated with the slot, so as to form a feed channel between the lower support plate, the deflector, the upper support plate and the diversion hole. One side of the deflector is inclined along the rotation direction of the rotor body.

[0006] The gap between the blades and the screen drum is 3-4 mm at the slag discharge side and 3.5-4.5 mm at the feed side.

[0007] One side of the described material feeding plate is inclined at 75 - 80° along the rotation direction of the rotor body.

[0008] The described material feeding plate is formed by bending a steel plate. The upper part of the material feeding plate is welded to the lower end of the upper support plate, and the lower part is welded in the groove opened on the lower support plate.

[0009] Below the position where the lower support plate is grooved, there is an acceleration and diversion vane inclined at 25 - 45°.

[0010] Several spoiler bars are welded to the inner side of the cylinder on the upper side of the upper support plate.

[0011] Each row of blades includes 3 blades, and several rows are evenly staggered axially. The last row of blades in the direction from the feeding side to the slag discharging side is slightly shorter and flush with the tail end of the previous row of blades.

[0012] The described blades are inclined at 15° - 20° along the axial direction.

[0013] The highest point on the outer side of each blade is located at the front 1 / 3 of the blade width. The front side of the blade is the first arc, and the first arc and the highest point on the outer side are transitioned by the second arc. The tail of the blade is the fourth arc, and the fourth arc and the highest point on the outer side of the blade are connected by a third arc protruding outward. The first arc and the fourth arc at the front and back of the blade are connected by a fifth arc protruding outward.

[0014] The described blades are connected to the cylinder through blade support rods.

[0015] Compared with the prior art, the pulp high - efficiency impurity removal rotor of the present invention has the following prominent beneficial effects:

[0016] Low energy consumption: By designing new - type blades and arranging them reasonably, the rotor can operate under low - speed conditions. Through reasonable setting of the blade gaps, the gap in the low - consistency area on the pulp feeding side is slightly larger, and the gap in the high - consistency area where impurities are concentrated on the slag discharging side is slightly smaller. Within a certain range, the smaller the gap, the higher the energy consumption, but the better the cleaning effect. Therefore, reasonable gap setting can further reduce energy consumption.

[0017] Good quality of refined pulp: By designing new - type blades and arranging them reasonably, and through reasonable setting of the blade gaps, the flow rate of the pulp is balanced throughout the entire area of the sieve drum, avoiding too fast flow rate in local areas, which may cause impurities to be extruded and deformed to pass through the sieve drum. Compared with the conventional pressure screen rotor, the removal efficiency of deformable adhesives and small - particle impurities is greatly improved.

[0018] Large production capacity: By setting a material distributing plate and a speed-increasing guide vane in the middle of the rotor, the un-screened low-concentration pulp is introduced into the high-concentration area on the slag discharge side. Without additional dilution water, the screening concentration in this area is reduced, avoiding the occurrence of concentration increase, effectively utilizing the entire surface of the sieve drum, improving the screening efficiency, and combined with a smaller clearance between the blades and the sieve drum, greatly enhancing the production capacity. Brief Description of the Drawings

[0019] Attached Figure 1 is the three-dimensional view of the high-efficiency pulp impurity removal rotor; Figure 1 ;

[0020] Attached Figure 2 is the three-dimensional view of the high-efficiency pulp impurity removal rotor; Figure 2 ;

[0021] Attached Figure 3 is the front view of the high-efficiency pulp impurity removal rotor;

[0022] Attached Figure 4 is the top view of the high-efficiency pulp impurity removal rotor;

[0023] Attached Figure 5 is the bottom view of the high-efficiency pulp impurity removal rotor;

[0024] Attached Figure 6 is the sectional view of the high-efficiency pulp impurity removal rotor;

[0025] Attached Figure 7 is the sectional view of the rotor body;

[0026] Attached Figure 8 is Figure 7 the A-A sectional view shown in

[0027] Attached Figure 9 is the developed view of the cylinder body of the rotor body;

[0028] Attached Figure 10 is the schematic diagram of the connection between the rotor and the sieve drum;

[0029] Attached Figure 11 is the developed layout diagram of the blades on the cylinder body;

[0030] Attached Figure 12 is the three-dimensional view of the blade;

[0031] Attached Figure 13 is the front view of the blade;

[0032] Attached Figure 14 is the side sectional view of the blade;

[0033] Attached Figure 15 is Figure 13 the B-B sectional view shown in

[0034] Description of the reference numerals: 1. Rotor body; 11. Cylindrical body; 111. Flow guiding hole; 12. Upper support plate; 121. Discharge hole; 13. Lower support plate; 131. Groove; 14. Rotor seat; 15. Rib plate; 16. Material deflecting plate; 17. Speed increasing and flow guiding vane; 18. Turbulence strip; 2. Blade; 21. Highest point on the outer side; 22. First arc; 23. Second arc; 24. Third arc; 25. Fourth arc; 26. Fifth arc; 3. Blade support rod; 31. Front arc surface of the support rod; 32. Rear arc surface of the support rod; 33. Connecting arc surface; 34. Slurry facing side; 4. Screen drum. Detailed implementation mode

[0035] Refer to the attached drawings of the specification Figure 1 to attached drawing Figure 15 The following is a detailed description of the high-efficiency pulp impurity removal rotor of the present invention.

[0036] The high-efficiency pulp impurity removal rotor of the present invention has a structure including a rotor body 1 and blades 2. The rotor body 1 includes a cylindrical body 11, an upper support plate 12, a lower support plate 13 and a rotor seat 14. The rotor seat 14 is arranged in the middle of the cylindrical body 11. The upper and lower parts of the rotor seat 14 are respectively connected to the cylindrical body 11 through the upper support plate 12 and the lower support plate 13. The cylindrical body 11 is cylindrical. The upper support plate 12 and the lower support plate 13 are welded inside the cylindrical body 11. In order to improve the support strength, there are several rib plates 15 evenly distributed in the circumferential direction between the upper support plate 12 and the lower support plate 13, and they are vertically welded to the upper support plate 12 and the lower support plate 13. Both the upper support plate 12 and the lower support plate 13 are circular rings. The blades 2 include multiple rows and are respectively arranged on the outer surface of the cylindrical body 11. The gap between the blades 2 and the screen drum 4 gradually increases from the slag discharge side to the feed side. There are several grooves 131 opened on the lower support plate 13, and a material deflecting plate 16 is arranged at each groove. The cross-sectional shape of the material deflecting plate 16 is the same as the shape of the groove. The upper part of the material deflecting plate 16 is connected to the upper support plate 12, and the lower part is arranged in the groove 131. A flow guiding hole 111 is opened at the corresponding position of the outer side of the material deflecting plate 16 on the cylindrical body 11. The flow guiding hole 111 is communicated with the groove, so as to form a feed channel between the lower support plate 13, the material deflecting plate 16, the upper support plate 12 and the flow guiding hole 111. One side of the material deflecting plate 16 is inclined along the rotation direction of the rotor body 1.

[0037] The gap between the blade 2 and the screen drum 4 is 3 - 4 mm at the slag discharge side, preferably 3 mm, and 3.5 - 4.5 mm at the feed side, preferably 3.5 mm.

[0038] One side of the material deflecting plate 16 is inclined 75 - 80° along the rotation direction of the rotor body 1, preferably 80°. Under the rotational force of the rotor, the raw materials that have not been screened at the bottom of the rotor can be pushed to the screening area in the middle and upper parts where impurities are enriched and the concentration is high, so as to improve the screening efficiency.

[0039] The described material pushing plate 16 is formed by bending a steel plate. The upper part of the material pushing plate 16 is welded to the lower end of the upper support plate 12, and the lower part is welded in the groove 131 opened on the lower support plate 13.

[0040] Below the grooving position of the described lower support plate 13, there is an acceleration and diversion vane 17 inclined at 25 - 45°. It can utilize the force generated by the rotation of the rotor to accelerate the slurry at the bottom of the rotor into the area of the material pushing plate 16, so that the unfiltered slurry can enter the upper area of the screening area more quickly and smoothly, further improving the screening efficiency.

[0041] Several spoiler bars 18 are welded to the inner side of the cylinder 11 on the upper side of the upper support plate 12. A discharge hole 121 is provided on the upper support plate corresponding to the grooving position of the lower support plate. The spoiler bars 18 can prevent light impurities from caking inside the cylinder 11 and affecting the rotor balance.

[0042] Each row of blades 2 includes 3 blades, which are evenly staggered in several axial rows. The last row of blades in the direction from the feed side to the slag discharge side is slightly shorter and is flush with the tail end of the previous row of blades.

[0043] The inclination angle a of the described blade 2 in the axial direction is 15° - 20°. The inclination angle is increased compared with conventional blades, and the increased inclination angle is beneficial to accelerating impurities into the slag discharge area during the screening process and reducing the thickening phenomenon.

[0044] The highest point 21 on the outer side of each blade 2 is located at the front 1 / 3 of the width of the blade 2. The front side of the blade 2 is a first arc 22 with a radius of 3 mm. The first arc 22 and the highest point 21 on the outer side are transitioned by a second arc 23 with a radius of 30 - 45 mm. Such a design increases the length of the positive pressure area, reduces the tangential collision force between the rotor blade 2 and impurities, and can introduce more slurry into the space between the blade 2 and the sieve drum, improving the suction force generated at the rear side of the blade 2. The tail of the blade 2 is a fourth arc 25 with a radius of 2 mm - 5 mm, preferably 2 mm, and is 14 - 20 mm away from the outer diameter of the blade 2's rotation. The fourth arc 25 and the highest point on the outer side of the blade 2 are connected by a third arc 24 with a radius of 130 - 200 mm protruding outward. The first arc 22 and the fourth arc 25 at the front and rear of the blade 2 are connected by a fifth arc 26 with a radius of about 800 mm protruding outward.

[0045] The described blade 2 is connected to the cylinder body 11 through a blade support rod 3. The blade support rod 3 is trapezoidal, arranged in the middle or on one side of the blade, slightly protruding at the connection with the blade 2. The inclination angle b of the front arc surface 31 of the support rod of the blade support rod 3 is 15°. The rear arc surface 32 of the support rod is parallel to the axis of the blade 2, thus forming a trapezoidal shape with a narrow side of the blade and a wide side of the rotor body 1. At the position where it is combined with the cylinder body 11 of the rotor body 1, there is a connecting arc surface 33 with the same outer diameter as the cylinder body 11, which increases the contact area between the blade support rod 3 and the cylinder body 11 and improves the welding strength. To further improve the welding strength, the 15-mm range on the cylinder side of the blade support rod 3 is thickened. The thickness of the blade support rod is generally 20 - 25 mm, and it is generally thickened by 10 mm in this area. This can not only ensure the connection strength between the blade 2 and the cylinder body 11 but also reduce the fluid resistance generated by the blade support rod 3. At the same time, to further reduce the fluid resistance and avoid cavitation phenomenon caused by too high flow velocity at the connection between the blade support rod 3 and the cylinder body 11, a chamfer is provided on the slurry-facing side 34 at the thickened part of the blade support rod.

[0046] The sieve drum is fixed on the pressure sieve housing. The rotor is installed on the main shaft of the drive unit through a rotor seat 14. The motor transmits power to the rotor through the main shaft. The rotor does not move axially and rotates around the axis. The slurry enters from the bottom of the screening area between the rotor and the sieve drum. Since the fibers in the slurry are not easy to pass through the sieve drum, a fiber network will gradually form on the surface of the sieve drum, hindering the subsequent fibers from passing through. At this time, it is necessary to clean the sieve drum with the rotor to break up the fiber network in order to maintain the continuation of the screening process. The rotating rotor moves along the surface of the sieve drum through the blades 2 welded on the rotor body 1, generating pressure on the slurry, increasing the pressure difference inside and outside the sieve drum, and the slurry passes through the sieve drum. When the gap between the tail of the blade 2 and the sieve drum 4 gradually increases, the pressure of the blade 2 on the slurry decreases, and a local negative pressure appears in this area. When the negative pressure makes the absolute values of the slurry pressures inside and outside the sieve drum equal, the slurry stops sieving. When the negative pressure continues to increase, the water in the good slurry outside the sieve drum and part of the slurry return through the sieve drum, playing a role in backwashing the pulp mass and long fiber impurities on the sieve drum, thus ensuring the continuous and normal operation of the pressure sieve.

[0047] The un-screened low-concentration slurry enters the high-concentration area where impurities are enriched on the slag-discharging side of the screening area from the inside of the rotor body 1 through the material deflector 16, reducing the slurry concentration and the concentration increase phenomenon, so that the screening can proceed normally.

[0048] The vanes 2 are arranged as shown in the figure, with 3 vanes in each row, and several rows are evenly staggered axially. The last row of vanes is slightly shorter and flush with the tail end of the previous row of vanes. Observed axially in several rows, the bottom is the pulp inlet side and the top is the residue discharge side. A large gap is adopted in the low-concentration area on the pulp inlet side, which can reduce the flow rate of the pulp passing through the sieve slots of the sieve drum and reduce the deformation of impurities passing through the sieve drum into the good pulp area due to the too fast pulp flow velocity. A small gap is adopted in the high-concentration area on the residue discharge side. Since impurities are concentrated on the residue discharge side and the pulp concentration is relatively high, a higher cleaning force is required to keep the sieve drum clean. Otherwise, this part of the sieve drum will be covered with fibers and the pulp cannot pass through. Such a gap setting not only reduces energy consumption but also improves the quality of the pulp passing through the sieve drum, greatly improving the screening efficiency.

[0049] The embodiments listed above are only for understanding the present invention and are not intended to limit the technical solutions described in the present invention. Those of ordinary skill in the relevant art can make various changes or deformations based on the technical solutions described in the claims. All equivalent changes or deformations should be covered within the protection scope of the claims of the present invention. Those parts not detailed in the present invention are well-known technologies to those skilled in the art.

Claims

1. High-efficiency pulp impurity removal rotor, comprising a rotor body and blades. The rotor body includes a cylinder, an upper support plate, a lower support plate and a rotor seat. The rotor seat is arranged in the middle of the cylinder. The upper and lower parts of the rotor seat are respectively connected to the cylinder through the upper support plate and the lower support plate. The blades include multiple rows and are respectively arranged on the outer surface of the cylinder. It is characterized in that: The gap between the blade and the sieve drum gradually increases from the slag discharge side to the feed side. A number of slots are formed in the lower support plate, and a deflector is provided at each slot. The cross-sectional shape of the deflector is the same as that of the slot. The upper part of the deflector is connected to the upper support plate, and the lower part is arranged in the slot. A diversion hole is formed in the corresponding cylinder body outside the deflector, and the diversion hole is communicated with the slot, so as to form a feed channel among the lower support plate, the deflector, the upper support plate and the diversion hole. One side of the deflector is inclined along the rotation direction of the rotor body.

2. The high-efficiency pulp impurity removal rotor according to claim 1, wherein the gap between the blade and the sieve drum is 3-4 mm at the slag discharge side and 3.5-4.5 mm at the feed side.

3. The high-efficiency pulp impurity removal rotor according to claim 1, wherein one side of the deflector is inclined 75-80° along the rotation direction of the rotor body.

4. The high-efficiency pulp impurity removal rotor according to claim 3, wherein the deflector is formed by bending a steel plate. The upper part of the deflector is welded to the lower end of the upper support plate, and the lower part is welded in the slot formed in the lower support plate.

5. The high-efficiency pulp impurity removal rotor according to claim 1, wherein a speed-increasing diversion piece inclined at 25-45° is arranged below the position where the lower support plate is slotted.

6. The high-efficiency pulp impurity removal rotor according to claim 1, wherein a number of spoiler bars are welded to the inner side of the cylinder body on the upper side of the upper support plate.

7. The high-efficiency pulp impurity removal rotor according to claim 1, wherein each row of blades comprises 3 blades, and a number of rows are evenly staggered in the axial direction. The last row of blades in the direction from the feed side to the slag discharge side is slightly shorter and flush with the tail end of the previous row of blades.

8. The high-efficiency pulp impurity removal rotor according to claim 1, wherein the blade is inclined 15°-20° in the axial direction.

9. The high-efficiency pulp impurity removal rotor according to claim 1, wherein the highest point on the outside of each blade is located at the front 1 / 3 of the blade width. The front side of the blade is a first arc, and the first arc and the highest point on the outside are transitioned by a second arc. The tail of the blade is a fourth arc, and the fourth arc and the highest point on the outside of the blade are connected by a third arc protruding outwards. The first arc and the fourth arc at the front and back of the blade are connected by a fifth arc protruding outwards.

10. The high-efficiency pulp impurity removal rotor according to claim 1, wherein the blade is connected to the cylinder body through a blade support rod.

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