A screening and pulp residue regrinding mechanism

Abstract

This invention discloses a screening and regrinding mechanism for pulp and slurry, comprising a housing, an axially arranged rotating shaft inside the housing, a grinding roller fixed on the rotating shaft, and a rotating screen cylinder arranged outside the grinding roller. The screen cylinder rotates in the opposite direction or at a differential speed to the grinding roller. A spiral conveying blade is provided on the outer wall of the screen cylinder, and a spiral conveying groove is provided on the grinding roller. The conveying directions of the spiral conveying groove and the spiral conveying blade are opposite. This invention, through the cooperation of the rotating grinding roller and the rotating screen cylinder, performs regrinding simultaneously with slurry conveying, thereby improving the efficiency of screening and regrinding.

Description

Technical Field

[0001] This utility model relates to the field of papermaking technology, and in particular to a screening and pulp regrinding mechanism. Background Technology

[0002] In the pulping and purification process of papermaking, pulp residue is generated. This residue contains incompletely dissociated fiber bundles, coarse fibers, and other impurities, requiring screening and regrinding to remove impurities and recover usable fibers. Existing regrinding mills mostly refine fiber bundles and coarse fibers through friction, compression, and shearing between blades and pulp residue. However, the efficiency of pulp residue processing and conveying needs further improvement. Utility Model Content

[0003] This invention proposes a screening and slurry regrinding mechanism. By using a rotating grinding roller and a rotating screen cylinder, regrinding is carried out simultaneously with slurry conveying, thereby improving the efficiency of screening and regrinding.

[0004] The technical solution of this utility model is implemented as follows: a screening and pulp regrinding mechanism includes a shell, a rotating shaft arranged axially inside the shell, a grinding roller fixed on the rotating shaft, a rotating screen cylinder arranged on the outside of the grinding roller, the screen cylinder and the grinding roller rotating in opposite directions or at different speeds, a spiral conveying blade arranged on the outer wall of the screen cylinder, and a spiral conveying groove arranged on the grinding roller, the conveying directions of the spiral conveying groove and the spiral conveying blade are opposite.

[0005] Furthermore, a feed inlet is provided at one end of the outer shell, which is connected to the inside of the screen cylinder; a coarse pulp outlet is provided at the other end of the outer shell, which is connected to the inside of the screen cylinder; and a fine pulp outlet is provided at the lower end of the outer shell near the feed inlet.

[0006] Furthermore, a feeding spiral blade is provided on the rotating shaft on the feeding side of the grinding roller, and a discharging spiral blade is provided on the rotating shaft on the discharging side. The pitch of the discharging spiral blade is smaller than that of the feeding spiral blade.

[0007] Furthermore, one end of the rotating shaft rotates through the housing and is connected to the first drive motor, while the other end is rotatably connected to the housing.

[0008] Furthermore, one end of the screen cylinder rotates through the outer shell and is connected to the transmission gear ring, which meshes with the drive gear, and the drive gear is connected to the second drive motor.

[0009] The beneficial effects of this utility model are: This invention utilizes a rotating grinding roller and a rotating screen cylinder to perform regrinding while the slurry is being conveyed, thereby improving the efficiency of screening and regrinding. Simultaneously, a spiral conveyor trough is used for conveying slurry residue, and a spiral conveyor blade is used for conveying fine slurry. The spiral conveyor blade is inclined relative to the outer shell and discharges the fine slurry by its own weight. The spiral conveyor blade design helps to increase the discharge rate of fine slurry.

[0010] This invention utilizes a feeding spiral blade for conveying slurry. During conveying, the slurry undergoes preliminary screening via a screen cylinder, and then the slurry residue is sent between the grinding roller and the screen cylinder for regrinding. A discharge spiral blade is used to convey and discharge the coarse slurry. The discharge spiral blade has a smaller pitch than the feeding spiral blade, slowing down the conveying speed of the coarse slurry and extending the regrinding time of the slurry residue, thus ensuring thorough regrinding. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] 1. Outer shell, 2. Rotating shaft, 3. First drive motor, 4. Grinding roller, 5. Feeding spiral blade, 6. Discharge spiral blade, 7. Screen cylinder, 8. Transmission gear ring, 9. Second drive motor, 10. Spiral conveying blade, 11. Spiral conveying trough, 12. Feed inlet, 13. Coarse pulp outlet, 14. Fine pulp outlet. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1 As shown, a screening and pulp regrinding mechanism includes a housing 1, and a rotating shaft 2 is arranged axially inside the housing 1. One end of the rotating shaft 2 passes through the housing 1 through a bearing and is connected to a first drive motor 3. The other end is rotatably connected to the housing 1 through a bearing. The rotating shaft 2 is driven to rotate by the first drive motor 3.

[0016] A grinding roller 4 is fixed on the rotating shaft 2. A feed spiral blade 5 is fixed on the rotating shaft 2 on the feed side of the grinding roller 4, and a discharge spiral blade 6 is fixed on the rotating shaft 2 on the discharge side. The pitch of the discharge spiral blade 6 is smaller than that of the feed spiral blade 5. The feed spiral blade 5 is used for feeding and conveying the slurry, and the discharge spiral blade 6 is used for conveying and discharging the coarse slurry. The small pitch of the discharge spiral blade 6 slows down the material conveying and prolongs the regrinding time of the slurry in the grinding roller 4 and the screen cylinder 7.

[0017] A rotating screen cylinder 7 is provided on the outer side of the grinding roller 4. One end of the screen cylinder 7 rotates through the outer shell 1 via a bearing and is fixedly connected to a transmission gear ring 8. The transmission gear ring 8 meshes with a drive gear, which is connected to a second drive motor 9. The other end of the screen cylinder 7 is rotatably connected to the outer shell 1 on the same side via a bearing. The second drive motor 9 drives the drive gear to rotate, and the drive gear drives the screen cylinder 7 to rotate via the transmission gear ring 8. The screen cylinder 7 rotates in the opposite direction to or at a differential speed with the grinding roller 4, thereby facilitating the re-grinding of the slurry between the grinding roller 4 and the screen.

[0018] A spiral conveyor blade 10 is fixed to the outer wall of the screen cylinder 7, and a spiral conveyor groove 11 is provided on the grinding roller 4. The conveying directions of the spiral conveyor groove 11 and the spiral conveyor blade 10 are opposite. A feed inlet 12 is fixed to one end of the outer shell 1, which communicates with the inner side of the screen cylinder 7. A coarse slurry outlet 13 is fixed to the other end of the outer shell 1, which communicates with the inner side of the screen cylinder 7. A fine slurry outlet 14 is fixed to the lower side of the outer shell 1 near the feed inlet 12. The spiral conveyor blade 10 drives the fine slurry to move towards the fine slurry outlet 14 and discharges it through the fine slurry outlet 14.

[0019] The screening and slurry regrinding mechanism is used as follows: the slurry enters the screen cylinder 7 through the feed inlet 12, the rotating shaft 2 rotates, and the feed spiral blade 5 drives the slurry to be fed and conveyed. The fine slurry in the slurry passes through the screen cylinder 7 and enters the outer shell 1, while the remaining slurry enters the grinding roller 4 and the screen cylinder 7 for regrinding. The fine slurry formed after regrinding passes through the screen cylinder 7 and enters the outer shell 1, while the remaining coarse slurry is conveyed by the discharge spiral blade 6 and discharged through the coarse slurry outlet 13. The fine slurry that enters the outer shell 1 is sent to the fine slurry outlet 14 for discharge by the spiral conveying blade 10 as the screen cylinder 7 rotates.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screening and pulp slurry regrinding device comprising a housing, a rotating shaft being arranged axially inside the housing, characterized in that: A grinding roller is fixed on a rotating shaft. A rotating screen cylinder is set on the outside of the grinding roller. The screen cylinder rotates in the opposite direction or at a different speed from the grinding roller. A spiral conveying blade is set on the outer wall of the screen cylinder. A spiral conveying groove is set on the grinding roller. The conveying direction of the spiral conveying groove and the spiral conveying blade is opposite.

2. The screening and pulp regrinding mechanism according to claim 1, characterized in that: One end of the outer shell is provided with a feed inlet, which is connected to the inside of the screen cylinder. The other end of the outer shell is provided with a coarse pulp outlet, which is connected to the inside of the screen cylinder. The lower side of the outer shell, near the feed inlet, is provided with a fine pulp outlet.

3. A screening and pulp regrinding mechanism according to claim 1 or 2, characterized in that: A feeding spiral blade is provided on the rotating shaft on the feeding side of the grinding roller, and a discharging spiral blade is provided on the rotating shaft on the discharging side. The pitch of the discharging spiral blade is smaller than that of the feeding spiral blade.

4. The screening and pulp regrinding mechanism according to claim 1, characterized in that: One end of the rotating shaft rotates through the outer casing and is connected to the first drive motor, while the other end is rotatably connected to the outer casing.

5. The screening and pulp regrinding mechanism according to claim 1, characterized in that: One end of the screen cylinder rotates through the outer shell and is connected to the transmission gear ring. The transmission gear ring meshes with the drive gear, and the drive gear is connected to the second drive motor.

Images