A pulverizing and screening device for pulp production

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By adopting a segmented design of coarse and fine screen holes in pulp production, along with lifting baffles and arc-shaped nozzle cleaning components, the adaptability of the rotary drum screening device in handling different raw materials has been solved, improving fiber utilization and pulp purity, reducing equipment blockage and downtime frequency, and increasing production efficiency.

CN224548836UActive Publication Date: 2026-07-24DONGGUAN JINTIAN PAPER CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: DONGGUAN JINTIAN PAPER CO LTD
Filing Date: 2025-09-05
Publication Date: 2026-07-24

AI Technical Summary

Technical Problem

Existing rotary drum screening devices cannot adapt to differences in fiber morphology when processing different raw materials, resulting in incomplete fiber breakage or screen clogging, which affects pulp quality and production efficiency.

Method used

The design employs a segmented approach with coarse and fine sieve holes, combined with a lifting baffle and an arc-shaped nozzle cleaning assembly, to achieve segmented screening and timely cleaning of fibers, thus preventing clogging.

Benefits of technology

It improves fiber utilization and pulp purity, reduces fiber loss and equipment downtime, and enhances production efficiency and continuity.

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Abstract

The utility model relates to pulp and papermaking technical field especially, relates to a kind of comminuting screening device for paper pulp production.The comminuting screening device for paper pulp production includes rotary drum screen body, lifting partition, baffle, arc nozzle and cleaning assembly, the inside installation of rotary drum screen body has screen cylinder and end installation is used for the power equipment of the rotation of screen cylinder driving, the inside equidistance installation of screen cylinder has lifting partition for turning pulp, the inside installation of screen cylinder has two baffle.The comminuting screening device for paper pulp production provided by the utility model adopts coarse sieve hole and fine sieve hole sectional design, coarse sieve hole intercepts large block impurity, while allowing small fiber to pass through;Fine sieve hole further retains small particle impurities, only retains qualified fiber, avoids the fiber loss caused by traditional single sieve hole considering coarse and fine;Raise raw material utilization, reduce the situation of not fully utilized fiber with impurities discharged.

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Description

Technical Field

[0001] This utility model relates to the field of pulp and paper technology, and in particular to a crushing and screening device for pulp production. Background Technology

[0002] In the pulping process, the rotary drum screening section is a key link in realizing the crushing of raw materials and the separation of fibers. Its performance directly affects the pulp quality, raw material utilization rate and production efficiency. However, the traditional rotary drum screening device currently used in pulping workshops has gradually revealed problems of incompatibility with the characteristics of existing pulps in long-term operation. Existing rotary drum screening sections mostly use a single-size screen hole structure, which cannot adapt to the different fiber morphology formed after the raw materials, such as waste paper, wood pulp, and straw pulp, are broken down. For example, some screen holes are too large, causing a large number of incompletely broken fiber bundles to be discharged with impurities, resulting in material waste; while some screen holes are too small, they are easily blocked by fine impurities or fiber clumps, reducing screening efficiency and forcing the equipment to stop frequently for cleaning, affecting production continuity.

[0003] Therefore, it is necessary to provide a new pulp crushing and screening device for pulp production to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a crushing and screening device for pulp production.

[0005] The pulp crushing and screening device provided by this utility model includes: a rotary screen body, lifting baffles, baffles, arc nozzles and cleaning components. The rotary screen body has a screen cylinder installed inside and a power device for driving the screen cylinder to rotate installed at the end. Lifting baffles for turning the pulp are installed at equal intervals inside the screen cylinder. Two baffles are installed inside the screen cylinder. Arc nozzles are installed at equal intervals inside the rotary screen body and are located above the screen cylinder. A cleaning component is installed between the rotary screen body and the screen cylinder. The cleaning component is used to remove impurities that clog the inside of the screen cylinder.

[0006] Preferably, the end of the screen cylinder closest to the power equipment has coarse screen holes at equal intervals, which are used to intercept large impurities, and the end of the screen cylinder furthest from the power equipment has fine screen holes at equal intervals, which are used to intercept small particulate impurities.

[0007] Preferably, the power equipment includes: a motor, a drive gear and a driven gear. The motor is fixedly connected to the end of the rotary screen body, the output end of the motor is fixedly connected to the drive gear, one side of the drive gear meshes with the driven gear, and the driven gear is fixedly connected to the end of the screen cylinder, and the two have the same axis.

[0008] Preferably, the bottom of the rotary screen body is symmetrically fixedly connected with guide channels, one of which corresponds to the coarse screen hole area and is connected to a conveying pipe at the bottom. The other end of the conveying pipe passes through the end of the screen cylinder away from the power equipment and is placed inside the fine screen hole area. The other guide channel corresponds to the fine screen hole area and is connected to a discharge port at the bottom.

[0009] Preferably, one of the two baffles is located in the transition area between the coarse and fine sieve holes inside the sieve cylinder, and the other is located in the end area of the fine sieve hole.

[0010] Preferably, the cleaning components include: a pump body and a connecting pipe. The top of the rotary screen body is fixedly connected to the connecting pipe, the arc-shaped nozzles are all connected to the bottom of the connecting pipe, the middle of the connecting pipe is connected to a flexible hose, the other end of the flexible hose is connected to the pump body, and the input end of the pump body is connected to a water storage tank through the flexible hose.

[0011] Preferably, the screen cylinder is made of 304 stainless steel.

[0012] Compared with related technologies, the pulp crushing and screening device for pulp production provided by this utility model has the following advantages: The design employs a segmented approach with coarse and fine sieves. The coarse sieve intercepts large impurities while allowing fine fibers to pass through; the fine sieve further traps small particles of impurities, retaining only qualified fibers. This avoids fiber loss caused by the traditional single sieve that tries to accommodate both coarse and fine fibers, thus improving raw material utilization and reducing the discharge of underutilized fibers with impurities. The lifting baffles on the inner wall of the screen cylinder rotate with the screen cylinder, turning the slurry over and breaking up the fiber agglomeration. This loosens the originally clumped fiber bundles and allows them to fully contact the screen holes, reducing blind spots caused by fiber aggregation. At the same time, the turning action prevents slurry sedimentation and allows the bottom fibers to participate in the screening, further improving the fiber throughput. The baffles at the transition zone and the end of the fine screen change the flow path of the pulp, extending its residence time in the coarse and fine screen zones, giving the fibers a greater chance to pass through the screen holes. Specifically, the extended residence time in the coarse screen zone can reduce the loss of qualified fibers with large impurities, while the extended residence time in the fine screen zone can more thoroughly separate fine impurities, improve the purity of the pulp, and meet the requirements of high-quality paper production for fiber cleanliness. The cleaning assembly, consisting of an arc-shaped nozzle and a pump body, sprays high-pressure water simultaneously as the screen cylinder rotates, covering the entire surface of the screen holes and promptly flushing away fibers or impurities stuck in the screen holes. This design reduces the screen hole clogging rate, avoids frequent shutdowns for cleaning caused by clogging in traditional devices, and effectively improves production efficiency. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of the pulp crushing and screening device for pulp production provided by this utility model; Figure 2 for Figure 1 The diagram shows the structural schematic of the side of the rotary screen body; Figure 3 for Figure 2 The diagram shows a cross-sectional view of the rotary screen body. Figure 4 for Figure 3 The diagram shows a cross-sectional view of the sieve cylinder.

[0014] The following are the labels in the diagram: 1. Rotary drum screen body; 2. Screen cylinder; 3. Power equipment; 4. Lifting baffle; 5. Baffle; 6. Arc-shaped nozzle; 7. Coarse screen hole; 8. Fine screen hole; 9. Motor; 10. Drive gear; 11. Driven gear; 12. Guide channel; 13. Conveying pipe; 14. Pump body; 15. Connecting pipe; 16. Water storage tank. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0017] Please see Figures 1 to 4A pulp crushing and screening device for pulp production includes: a rotary screen body 1, lifting baffles 4, baffles 5, arc-shaped nozzles 6, and a cleaning component. The rotary screen body 1 houses a screen cylinder 2 and a power unit 3 at its end for driving the screen cylinder 2 to rotate. Lifting baffles 4 for agitating the pulp are equidistantly installed inside the screen cylinder 2. Two baffles 5 are installed inside the screen cylinder 2. Arc-shaped nozzles 6 are equidistantly installed inside the rotary screen body 1, positioned above the screen cylinder 2. A cleaning component is installed between the rotary screen body 1 and the screen cylinder 2 to remove impurities clogging the screen cylinder 2. Coarse screening holes 7 are equidistantly opened at the end of the screen cylinder 2 closest to the power unit 3 to intercept large impurities. Fine screening holes 8 are equidistantly opened at the end of the screen cylinder 2 furthest from the power unit 3 to intercept small particle impurities. The device 3 includes: a motor 9, a drive gear 10, and a driven gear 11. The motor 9 is fixedly connected to the end of the rotary screen body 1. The drive gear 10 is fixedly connected to the output end of the motor 9. The driven gear 11 meshes with one side of the drive gear 10. The driven gear 11 is fixedly connected to the end of the screen cylinder 2, and the two have the same axis. The bottom of the rotary screen body 1 is symmetrically fixedly connected with guide grooves 12. One guide groove 12 corresponds to the area of the coarse screen hole 7 and is connected to the bottom of the conveying pipe 13. The other end of the conveying pipe 13 passes through the end of the screen cylinder 2 away from the power device 3 and is placed inside the area of the fine screen hole 8. The other guide groove 12 corresponds to the area of the fine screen hole 8 and is connected to the bottom of the discharge port. One of the two baffles 5 is located in the transition area between the coarse screen hole 7 and the fine screen hole 8 inside the screen cylinder 2, and the other is located in the end area of the fine screen hole 8. The screen cylinder 2 is made of 304 stainless steel.

[0018] It should be noted that: the slurry to be screened enters the screen cylinder 2 through the feed inlet of the rotary screen body 1, initially contacting the area of the coarse screen hole 7; the coarse screen hole 7 has a large aperture, and under the centrifugal force generated by the rotation of the screen cylinder 2, fibers, fine impurities and water in the slurry with a particle size smaller than the coarse screen hole 7 fall through the screen hole into the corresponding guide channel 12 below, while large impurities cannot pass through the coarse screen hole 7 and are intercepted, moving towards the end with the rotation of the screen cylinder 2; the lifting baffles 4 installed at equal intervals on the inner wall of the screen cylinder 2 rotate synchronously with the screen cylinder 2. When the baffle rotates to the bottom, it lifts the slurry deposited at the bottom of the screen cylinder 2 upward, so that the accumulated slurry is fully dispersed, increasing the probability of contact between the fibers and the coarse screen hole 7, and avoiding insufficient screening due to the slurry standing still; the baffle 5 located in the transition area between the coarse screen hole 7 and the fine screen hole 8 obstructs the flow of slurry, forcing the slurry to change its path and forming a local vortex in the coarse screen area.

[0019] Please see Figure 2 and Figure 4The cleaning components include: a pump body 14 and a connecting pipe 15. The top of the rotary screen body 1 is fixedly connected to the connecting pipe 15. The arc nozzles 6 are all connected to the bottom of the connecting pipe 15. The middle part of the connecting pipe 15 is connected to a hose. The other end of the hose is connected to the pump body 14. The input end of the pump body 14 is connected to a water storage tank 16 through the hose. It should be noted that the cleaning components start synchronously: the pump body 14 draws clean water from the water storage tank 16 through the hose, pressurizes it and delivers it to the connecting pipe 15, and then sprays high-pressure water through the arc-shaped nozzles 6 installed at equal intervals inside the rotary screen body 1; as the screen cylinder 2 rotates, the water sprayed by the arc-shaped nozzles 6 can cover the entire surface of the screen cylinder 2, continuously flushing the coarse screen holes 7 and fine screen holes 8, washing off the fibers or impurities stuck in the screen holes, avoiding the decrease in screening efficiency caused by screen hole blockage, and reducing the frequency of equipment shutdown for cleaning.

[0020] The working principle of the pulp crushing and screening device for pulp production provided by this utility model is as follows: When the device is started, the motor 9 in the power equipment 3 is connected to the power supply, and the output end drives the drive gear 10 to rotate. The drive gear 10 meshes with the driven gear 11 for transmission. Since the driven gear 11 is fixed to the end of the screen cylinder 2 and is coaxial, the screen cylinder 2 rotates synchronously with the driven gear 11, providing continuous rotational power for subsequent screening. The slurry to be screened enters the inside of the screen cylinder 2 through the feed port of the rotary screen body 1 and initially contacts the area of the coarse screen hole 7. The coarse screen hole 7 has a large aperture. Under the centrifugal force generated by the rotation of the screen cylinder 2, fibers, fine impurities and water with a particle size smaller than the coarse screen hole 7 in the slurry fall into the corresponding guide groove 12 below through the screen hole. Large impurities cannot pass through the coarse screen hole 7 and are intercepted, and move towards the end with the rotation of the screen cylinder 2. The lifting baffles 4, which are equidistantly installed on the inner wall of the screen cylinder 2, rotate synchronously with the screen cylinder 2. When the baffles rotate to the bottom, they lift the slurry deposited at the bottom of the screen cylinder 2 upwards, so that the accumulated slurry is fully dispersed, increasing the probability of contact between the fibers and the coarse screen holes 7, and avoiding insufficient screening due to the slurry standing still. At the same time, the flipping action of the lifting baffles 4 further loosens the fiber bundles, reducing the situation where they cannot pass through the screen holes due to clumping. The baffle 5 located in the transition area between the coarse screen hole 7 and the fine screen hole 8 obstructs the flow of slurry, forcing the slurry to change its path and forming a local vortex in the coarse screen area. This design prolongs the residence time of the slurry in the coarse screen hole 7 area, ensuring that more qualified fibers pass through the screen holes and reducing the amount of raw material lost with large impurities. After the slurry passing through the coarse screen hole 7 falls into the corresponding guide trough 12, it is transported to the end of the screen cylinder 2 away from the power equipment 3 through the bottom-connected conveying pipe 13, and re-enters the fine screen hole 8 area inside the screen cylinder 2. The fine screen hole 8 has a smaller aperture, which performs secondary screening on the slurry after coarse screening, intercepting impurities such as fiber bundles and fine mud and sand with a particle size larger than the fine screen hole 8, and only allowing fibers that meet the requirements for pulping to pass through. The baffle 5 at the end of the fine screen hole 8 area further blocks the flow of pulp, prolonging the residence time of the pulp in the fine screen area. At the same time, the dense lifting baffle 4 in this area strengthens the pulp agitation, ensuring that the fiber is in full contact with the fine screen hole 8 and improving the pulp purity. The qualified slurry passing through the fine screen hole 8 falls into the corresponding guide trough 12 below, flows out through the bottom outlet, and enters the slurry storage tank for later use, completing the screening process; the large impurities intercepted in the coarse screening stage and the small impurities intercepted in the fine screening stage are finally discharged from the end opening of the screen cylinder 2 away from the power equipment 3 under the rotation and pushing of the screen cylinder 2, and enter the waste collection device. As the screen cylinder 2 rotates, the cleaning components start simultaneously: the pump body 14 draws clean water from the water storage tank 16 through a hose, pressurizes it, and delivers it to the connecting pipe 15, and then sprays high-pressure water through the arc-shaped nozzles 6 installed at equal intervals inside the rotating screen body 1; as the screen cylinder 2 rotates, the water sprayed from the arc-shaped nozzles 6 can cover the entire surface of the screen cylinder 2, continuously flushing the coarse screen holes 7 and fine screen holes 8, washing away the fibers or impurities stuck in the screen holes, avoiding the decrease in screening efficiency caused by screen hole blockage, and reducing the frequency of equipment shutdown for cleaning.

[0021] All standard parts used above can be purchased from the market. Irregular parts can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology. In addition, the circuit connection adopts conventional connection methods in the existing technology, which will not be described in detail here.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A pulp crushing and screening device for pulp production, characterized in that, include: Rotary drum screen body (1), with a screen cylinder (2) installed inside the rotary drum screen body (1) and a power device (3) installed at the end for driving the screen cylinder (2) to rotate. Lifting baffles (4) are installed at equal intervals inside the screen cylinder (2) for turning the slurry. Baffle (5), two baffles (5) are installed inside the sieve cylinder (2); Arc nozzles (6) are installed at equal intervals inside the rotating drum screen body (1), and the arc nozzles (6) are located above the screen cylinder (2); A cleaning component is installed between the rotary screen body (1) and the screen cylinder (2). The cleaning component is used to remove impurities that clog the inside of the screen cylinder (2).

2. The pulp crushing and screening device according to claim 1, characterized in that, The screen cylinder (2) has coarse screen holes (7) at equal intervals at one end near the power equipment (3). The coarse screen holes (7) are used to intercept large impurities. The screen cylinder (2) has fine screen holes (8) at equal intervals at one end away from the power equipment (3). The fine screen holes (8) are used to intercept small particle impurities.

3. The pulp crushing and screening device according to claim 1, characterized in that, The power equipment (3) includes: a motor (9), a drive gear (10) and a driven gear (11). The motor (9) is fixedly connected to the end of the rotary screen body (1). The drive gear (10) is fixedly connected to the output end of the motor (9). The driven gear (11) meshes with one side of the drive gear (10). The driven gear (11) is fixedly connected to the end of the screen cylinder (2), and the two have the same axis.

4. The pulp crushing and screening device according to claim 2, characterized in that, The bottom of the rotary screen body (1) is symmetrically fixed with guide grooves (12). One of the guide grooves (12) corresponds to the area of the coarse screen hole (7) and is connected to the bottom of the conveying pipe (13). The other end of the conveying pipe (13) passes through the end of the screen cylinder (2) away from the power equipment (3) and is placed inside the area of the fine screen hole (8). The other guide groove (12) corresponds to the area of the fine screen hole (8) and is connected to the bottom of the discharge port.

5. The pulp crushing and screening device according to claim 1, characterized in that, One of the two baffles (5) is located in the transition area between the coarse sieve hole (7) and the fine sieve hole (8) inside the sieve cylinder (2), and the other is located in the end area of the fine sieve hole (8).

6. The pulp crushing and screening device for pulp production according to claim 1, characterized in that, The cleaning components include: a pump body (14) and a connecting pipe (15). The top of the rotary screen body (1) is fixedly connected to the connecting pipe (15). The arc nozzles (6) are all connected to the bottom of the connecting pipe (15). The middle part of the connecting pipe (15) is connected to a hose. The other end of the hose is connected to the pump body (14). The input end of the pump body (14) is connected to a water storage tank (16) through the hose.

7. The pulp crushing and screening device according to claim 1, characterized in that, The sieve cylinder (2) is made of 304 stainless steel.