Papermaking pulp screening device

Abstract

The papermaking pulp screening device comprises a conveying screening assembly, a discharging and beating mechanism, a position clamping mechanism and a clamping auxiliary mechanism, and the discharging and beating mechanism comprises a lateral plate, a driving motor, an eccentric wheel, a push-pull rod, a mounting frame, a push-pull block and a beating block. The position clamping mechanism comprises a mounting plate, adjusting holes, a clamping pipe, a clamping rod, a rotating tooth rod, a rotating block and an embedding groove, the discharging and beating mechanism drives an eccentric wheel and a push-pull rod through a driving motor, so that the beating block beats the side wall of a discharging hopper in a reciprocating mode, paper pulp is effectively prevented from being attached to and blocking the discharging hopper, and multiple sets of adjusting holes in a lateral plate are matched with the clamping rod and the clamping pipe; and the design that a rotating tooth rod and a rotating block extend into a clamping rod embedding groove forms reliable mechanical locking, and it is guaranteed that the position is stable after adjustment.

Description

Technical Field

[0001] This utility model relates to the field of pulp screening technology, and more specifically, to a paper pulp screening device. Background Technology

[0002] In the paper industry, pulp screening equipment is a key piece of equipment, and its performance directly affects production efficiency and finished product quality. However, existing pulp screening equipment generally suffers from significant problems, such as pulp adhering to the inner wall of the discharge hopper, causing blockages, and the inconvenience of adjusting the position of the hammering and vibrating components. These problems severely restrict the continuity and efficiency of paper production.

[0003] Pulp contains a large amount of fiber and sticky substances. When it flows through the discharge hopper, some of these fibers and sticky substances easily adhere to the inner wall of the hopper. As the production process continues, these deposits gradually accumulate and thicken, eventually narrowing or even completely blocking the discharge channel. To solve the problem of pulp adhering to the inner wall of the discharge hopper, existing technologies often use a hammering vibration assembly to periodically remove the deposits using mechanical force. However, these assemblies have significant drawbacks in terms of position adjustment. Traditional hammering vibration assemblies are mostly fixed in place, and once the position is determined, it is difficult to adjust them according to actual production needs. This rigid design cannot adapt to the differences in characteristics of different types of pulp; it may over-hammer some products while being insufficiently effective for others. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a paper pulp screening device to solve the technical problems mentioned in the background art, such as pulp adhering to the inner wall of the discharge hopper and the inconvenience of adjusting the position of the hammering vibration component.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a paper pulp screening device, comprising a conveying and screening component, a discharge and beating mechanism, a position locking mechanism, and a locking auxiliary mechanism. The discharge and beating mechanism includes a side plate, a drive motor, an eccentric wheel, a push-pull rod, a mounting frame, a push-pull block, and a beating block. The drive motor is mounted on the side of the mounting frame, the eccentric wheel is mounted on the output end of the drive motor, the push-pull block is slidably mounted on the side of the mounting frame, the two ends of the push-pull rod are rotatably connected to the push-pull block and the eccentric wheel, and the beating block is mounted on one end of the push-pull block. The position locking mechanism includes a mounting plate, adjusting holes, a locking tube, a locking rod, a rotating toothed rod, a rotating block, and an embedding groove. The mounting plate is mounted on both sides of the mounting frame, multiple sets of adjusting holes are provided on the side plate, the locking tube is fixedly mounted on the mounting plate, the locking rod can pass through different adjusting holes and engage with the locking tube, the rotating toothed rod is rotatably mounted inside the side wall of the locking tube, the embedding groove is provided on the side wall of the locking rod, the rotating block is mounted on the rotating toothed rod, and the rotating block rotates and extends into the embedding groove to fix the locking rod inside the locking tube.

[0008] The present invention is further configured such that the snap-fit ​​auxiliary mechanism includes a rotating sleeve, an internal toothed ring, ball blocks, an outer fixed plate, counter-shrinking blocks, a fixing block, and counter-shrinking springs. The rotating sleeve is rotatably mounted on the outer wall of the snap-fit ​​tube, the internal toothed ring is mounted on the inner wall of the rotating sleeve, and the internal toothed ring is meshed with one end of the rotating toothed rod. Multiple sets of ball blocks are mounted on the top end of the rotating sleeve, the outer fixed plate is mounted on the outer wall of the snap-fit ​​tube, multiple sets of counter-shrinking blocks are arranged in a ring at the bottom end of the outer fixed plate, and the counter-shrinking springs are installed between the fixing block and the counter-shrinking blocks. The ball blocks extend into the space between the counter-shrinking blocks and the fixing block in stages, so that the rotating sleeve rotates stably.

[0009] The present invention is further configured such that a discharge hopper is installed at the bottom end of the conveying and screening assembly, and the pounding block reciprocates to pound the side wall of the discharge hopper. The discharge hopper guides the screened pulp to be discharged in an orderly manner, preventing it from scattering. It works in conjunction with the pounding block to reduce the risk of clogging.

[0010] The present invention is further configured such that a frame is installed at the bottom end of the conveying and screening component, and a side plate is installed on the side of the frame. The frame provides a stable support structure for the entire device and connects the side plate to ensure the relative position stability of each component.

[0011] The present invention is further configured such that a guide rod is installed on the mounting bracket, and the push-pull block is slidably guided on the guide rod. The guide rod guides the push-pull block to move along a straight trajectory, ensuring motion accuracy, reducing the offset and shaking of the push-pull block, and extending the service life of the component.

[0012] The present invention is further configured such that a limiting block is installed at one end of the locking rod, and one end face of the limiting block is in contact with the bottom end of the side plate. The limiting block is installed at one end of the locking rod to prevent the locking rod from completely passing through the adjustment hole.

[0013] The present invention is further configured such that a radial rail is installed on the bottom end face of the outer fixed plate, and the shrink block is configured to slide radially on the radial rail. The radial rail is installed at the bottom of the outer fixed plate to guide the shrink block to slide radially, ensuring that the shrink block moves in the same direction and improving the locking reliability.

[0014] The present invention is further provided that a connecting plate is installed at the bottom end of the side wall of the clamping tube, and the connecting plate is fixedly installed on the mounting plate. The connecting plate strengthens the connection between the clamping tube and the mounting plate and improves the structural strength.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a paper pulp screening device, which has the following features:

[0017] Beneficial effects:

[0018] This invention features a discharge hammering mechanism. A drive motor drives an eccentric wheel and a push-pull rod to cause the hammering blocks to reciprocate and hammer the side wall of the discharge hopper, effectively preventing pulp adhesion and blockage. The guide rod ensures precise movement, reduces component wear, and extends equipment life.

[0019] This utility model is equipped with a position locking mechanism. Multiple sets of adjustment holes on the side plate, together with the locking rod and locking tube design, enable quick and precise adjustment of the hammering position. The design of the rotating tooth rod and rotating block extending into the locking rod embedding groove forms a reliable mechanical lock, ensuring that the position is stable after adjustment. The limiting block prevents the locking rod from falling off, improving safety.

[0020] This invention features a locking auxiliary mechanism, and the rotating sleeve and internal gear ring design provide a convenient operating interface. The ball blocks extend progressively between the shrinking block and the fixed block to form a graded locking mechanism, preventing accidental loosening. This provides elastic support to the shrinking spring, ensuring reliable locking. The centripetal rail guides the shrinking block's movement in the same direction, further enhancing locking stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the device in the unused state of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the conveying and screening component in this utility model;

[0023] Figure 3 This is a schematic diagram of the position locking mechanism in this utility model;

[0024] Figure 4 This is a schematic diagram of the position locking mechanism and locking auxiliary mechanism in this utility model;

[0025] Figure 5This is a schematic diagram of the internal structure of the position locking mechanism and the locking auxiliary mechanism in this utility model.

[0026] In the diagram: 1. Conveying and screening assembly; 2. Side plate; 3. Drive motor; 4. Eccentric wheel; 5. Push-pull rod; 6. Mounting frame; 7. Push-pull block; 8. Hammering block; 9. Mounting plate; 10. Adjustment hole; 11. Clip-on pipe; 12. Clip-on rod; 13. Rotating gear; 14. Rotating block; 15. Embedded groove; 16. Rotating sleeve; 17. Internal gear ring; 18. Ball block; 19. Outer fixing plate; 20. Retracting block; 21. Fixing block; 22. Retracting spring; 23. Discharge hopper; 24. Frame; 25. Guide rod; 26. Limiting block; 27. Centripetal rail; 28. Connecting plate. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0030] Please see Figures 1-5A paper pulp screening device includes a conveying and screening assembly 1, a discharge and beating mechanism, a position locking mechanism, and a locking auxiliary mechanism. The discharge and beating mechanism includes a side plate 2, a drive motor 3, an eccentric wheel 4, a push-pull rod 5, a mounting frame 6, a push-pull block 7, and a beating block 8. The drive motor 3 is mounted on the side of the mounting frame 6, the eccentric wheel 4 is mounted on the output end of the drive motor 3, the push-pull block 7 is slidably mounted on the side of the mounting frame 6, both ends of the push-pull rod 5 are rotatably connected to the push-pull block 7 and the eccentric wheel 4, and the beating block 8 is mounted on one end of the push-pull block 7. The position locking mechanism includes a mounting plate 9. Adjustment holes 10, locking tube 11, locking rod 12, rotating gear 13, rotating block 14, and embedding groove 15 are provided. Mounting plate 9 is installed on both sides of mounting bracket 6. Multiple sets of adjustment holes 10 are provided on side plate 2. Locking tube 11 is fixedly installed on mounting plate 9. Locking rod 12 can pass through different adjustment holes 10 and engage with locking tube 11. Rotating gear 13 is rotatably installed in the side wall of locking tube 11. Embedding groove 15 is provided in the side wall of locking rod 12. Rotating block 14 is installed on rotating gear 13. Rotating block 14 rotates and extends into embedding groove 15 to fix locking rod 12 in locking tube 11.

[0031] In this embodiment, the discharge beating mechanism mainly realizes the automatic beating function of the discharge hopper 23 to prevent pulp blockage. The drive motor 3 is installed on the side of the mounting frame 6. After starting, it drives the eccentric wheel 4 at the output end to rotate. The eccentric wheel 4 is rotatably connected to the push-pull rod 5, converting the rotational motion into push-pull motion. The other end of the push-pull rod 5 is connected to the push-pull block 7. The push-pull block 7 slides on the side of the mounting frame 6 and the guide rod 25. The beating block 8 is installed at one end of the push-pull block 7. With the reciprocating motion of the push-pull block 7, the beating block 8 rhythmically reciprocates and beats the side wall of the discharge hopper 23 at the bottom of the conveying and screening component 1. This reciprocating beating action prevents the pulp from being blocked or accumulated during the discharge process. The position locking mechanism realizes the adjustment and fixation of the position of the discharge beating mechanism. Mounting plate 9 is installed on both sides of mounting bracket 6. Locking tube 11 is fixed to mounting plate 9. Multiple sets of adjustment holes 10 are provided on side plate 2, allowing selection of different adjustment holes 10. Locking rod 12 passes through the selected adjustment hole 10 and extends into locking tube 11. Rotary gear 13 is rotatably installed inside the side wall of locking tube 11. Rotary block 14 is installed on rotary gear 13. When locking rod 12 is inserted into locking tube 11, rotating rotary gear 13 causes rotating block 14 to rotate and extend into the embedding groove 15 on the side wall of locking rod 12. After rotating block 14 is embedded in groove 15, locking rod 12 is fixed inside locking tube 11, achieving position locking. Restriction block 26 at one end of locking rod 12 contacts the bottom of side plate 2 to prevent locking rod 12 from completely passing through adjustment hole 10.

[0032] The snap-fit ​​auxiliary mechanism includes a rotating sleeve 16, an internal gear ring 17, ball blocks 18, an outer fixed plate 19, counter-shrinking blocks 20, a fixed block 21, and counter-shrinking springs 22. The rotating sleeve 16 is rotatably mounted on the outer wall of the snap-fit ​​tube 11. The internal gear ring 17 is mounted on the inner wall of the rotating sleeve 16 and is meshed with one end of the rotating gear rod 13. Multiple sets of ball blocks 18 are mounted on the top end of the rotating sleeve 16. The outer fixed plate 19 is mounted on the outer wall of the snap-fit ​​tube 11. Multiple sets of counter-shrinking blocks 20 are arranged in a ring at the bottom end of the outer fixed plate 19. The counter-shrinking springs 22 are installed between the fixed block 21 and the counter-shrinking blocks 20. The ball blocks 18 extend into the space between the counter-shrinking blocks 20 and the fixed block 21 in stages, so that the rotating sleeve 16 rotates stably.

[0033] In this embodiment, the rotating sleeve 16 is rotatably mounted on the outer wall of the clamping tube 11, and the internal gear ring 17 is mounted on the inner wall of the rotating sleeve 16. The internal gear ring 17 is meshed with one end of the rotating gear 13. The rotation of the rotating sleeve 16 drives the rotating gear 13 to rotate. Multiple sets of ball blocks 18 are mounted on the top of the rotating sleeve 16. The outer fixed plate 19 is mounted on the outer wall of the clamping tube 11. Multiple sets of counter-shrinking blocks 20 are arranged in a ring at the bottom of the outer fixed plate 19. The counter-shrinking spring 22 is installed between the fixed block 21 and the counter-shrinking block 20. After the rotating sleeve 16 rotates to the appropriate position, the ball blocks 18 extend into the counter-shrinking block 20 and the fixed block 21 in stages. The snapping action of the ball blocks 18 keeps the rotating sleeve 16 stable and prevents accidental rotation. The centripetal rail 27 is mounted on the bottom of the outer fixed plate 19. The counter-shrinking blocks 20 slide centripetally on the centripetal rail 27 to ensure that the centripetal force direction is consistent.

[0034] Please see Figures 1-5 As a supplementary embodiment of a paper pulp screening device for the discharge hammering mechanism, the position locking mechanism, and the locking auxiliary mechanism: A discharge hopper 23 is installed at the bottom end of the conveying screening component 1, and the hammering block 8 reciprocates to hammer the side wall of the discharge hopper 23. A frame 24 is installed at the bottom end of the conveying screening component 1, and a side plate 2 is installed on the side of the frame 24. A guide rod 25 is installed on the mounting frame 6, and a push-pull block 7 is slidably guided on the guide rod 25. A limiting block 26 is installed at one end of the locking rod 12, and one end face of the limiting block 26 is in contact with the bottom end of the side plate 2. A centripetal rail 27 is installed on the bottom end face of the outer fixed plate 19, and a shrinking block 20 is slidably set on the centripetal rail 27. A connecting plate 28 is installed at the bottom end of the side wall of the locking pipe 11, and the connecting plate 28 is fixedly installed on the mounting plate 9.

[0035] More specifically, adjust the position of the mounting bracket 6 as needed, select an appropriate adjustment hole 10 on the side plate 2, pass the snap-fit ​​rod 12 through the selected adjustment hole 10, and insert it into the snap-fit ​​tube 11. By rotating the rotating sleeve 16, the internal toothed ring 17 drives the rotating toothed rod 13 to rotate, causing the rotating block 14 to extend into the embedding groove 15 of the snap-fit ​​rod 12. The ball block 18 extends step by step between the shrink block 20 and the fixing block 21, fixing the position of the rotating sleeve 16. The conveying screening component 1 screens the pulp, and the drive motor 3 starts. The eccentric wheel 4 and the push-pull rod 5 drive the push-pull block 7 to slide back and forth on the guide rod 25. The push-pull block 7 drives the hammer block 8 to rhythmically hammer the side wall of the discharge hopper 23. The hammering action prevents the pulp from clogging during the discharge process and ensures the continuity of the screening and discharge process. If the hammering position needs to be adjusted, first release the locking of the snap-fit ​​auxiliary mechanism, rotate the rotating sleeve 16 to make the rotating block 14 exit from the embedded groove 15, pull out the snap-fit ​​rod 12, select a new adjustment hole 10 position, and re-perform the snap-fit ​​and locking operation.

[0036] In summary, during the use or operation of the overall equipment: when the discharge hammering mechanism is in operation, the discharge hammering mechanism mainly realizes the automatic hammering function of the discharge hopper 23 to prevent pulp blockage. The drive motor 3 is installed on the side of the mounting frame 6. After starting, it drives the eccentric wheel 4 at the output end to rotate. The eccentric wheel 4 is rotatably connected to the push-pull rod 5, converting the rotational motion into push-pull motion. The other end of the push-pull rod 5 is connected to the push-pull block 7. The push-pull block 7 slides on the side of the mounting frame 6 and the guide rod 25. The hammering block 8 is installed at one end of the push-pull block 7. With the reciprocating motion of the push-pull block 7, the hammering block 8 rhythmically reciprocates and hammers the side wall of the discharge hopper 23 at the bottom of the conveying and screening component 1. This reciprocating hammering action prevents the pulp from being blocked or accumulated during the discharge process.

[0037] When the position locking mechanism is in operation, it adjusts and fixes the position of the hammering mechanism. The mounting plate 9 is installed on both sides of the mounting frame 6, and the locking tube 11 is fixed on the mounting plate 9. Multiple sets of adjustment holes 10 are provided on the side plate 2, and different positions of the adjustment holes 10 can be selected. The locking rod 12 passes through the selected adjustment hole 10 and extends into the locking tube 11. The rotating gear 13 is rotatably installed in the side wall of the locking tube 11, and the rotating block 14 is installed on the rotating gear 13. When the locking rod 12 is inserted into the locking tube 11, the rotating gear 13 is rotated, so that the rotating block 14 rotates and extends into the embedding groove 15 on the side wall of the locking rod 12. After the rotating block 14 is embedded in the groove 15, the locking rod 12 is fixed in the locking tube 11, realizing position locking. The limiting block 26 at one end of the locking rod 12 contacts the bottom of the side plate 2 to prevent the locking rod 12 from completely passing through the adjustment hole 10.

[0038] When the auxiliary mechanism needs to be engaged, the rotating sleeve 16 is mounted on the outer wall of the clamping tube 11 for limiting rotation, and the internal gear ring 17 is mounted on the inner wall of the rotating sleeve 16. The internal gear ring 17 is meshed with one end of the rotating gear 13. The rotation of the rotating sleeve 16 drives the rotating gear 13 to rotate. Multiple sets of ball blocks 18 are mounted on the top of the rotating sleeve 16, and the outer fixed plate 19 is mounted on the outer wall of the clamping tube 11. Multiple sets of counter-shrinking blocks 20 are arranged in a ring at the bottom of the outer fixed plate 19. Counter-shrinking springs 22 are installed between the fixed block 21 and the counter-shrinking blocks 20. After the rotating sleeve 16 rotates to the appropriate position, the ball blocks 18 extend into the counter-shrinking blocks 20 and the fixed block 21 in stages. The snapping action of the ball blocks 18 keeps the rotating sleeve 16 stable and prevents accidental rotation. The centripetal rail 27 is mounted on the bottom of the outer fixed plate 19, and the counter-shrinking blocks 20 slide centripetally on the centripetal rail 27 to ensure that the centripetal force is in the same direction.

[0039] Adjust the position of the mounting bracket 6 as needed, select an appropriate adjustment hole 10 on the side plate 2, pass the snap-fit ​​rod 12 through the selected adjustment hole 10, and insert it into the snap-fit ​​tube 11. By rotating the rotating sleeve 16, the internal toothed ring 17 drives the rotating toothed rod 13 to rotate, causing the rotating block 14 to extend into the embedding groove 15 of the snap-fit ​​rod 12. The ball block 18 extends step by step between the shrink block 20 and the fixing block 21, fixing the position of the rotating sleeve 16. The conveying screening component 1 screens the pulp. The drive motor 3 starts, and the eccentric... The heart wheel 4 and the push-pull rod 5 drive the push-pull block 7 to slide back and forth on the guide rod 25. The push-pull block 7 drives the hammer block 8 to rhythmically hammer the side wall of the discharge hopper 23. The hammering action prevents the pulp from clogging during the discharge process and ensures the continuity of the screening and discharge process. If the hammering position needs to be adjusted, first release the locking of the snap-fit ​​auxiliary mechanism, rotate the rotating sleeve 16 to make the rotating block 14 exit from the embedded groove 15, pull out the snap-fit ​​rod 12, select a new adjustment hole 10 position, and re-perform the snap-fit ​​and locking operation.

[0040] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A paper pulp screening device, comprising a conveying and screening assembly (1), a discharge beating mechanism, a position locking mechanism, and a locking auxiliary mechanism, characterized in that: The discharge hammering mechanism includes a side plate (2), a drive motor (3), an eccentric wheel (4), a push-pull rod (5), a mounting bracket (6), a push-pull block (7), and a hammering block (8). The drive motor (3) is mounted on the side of the mounting bracket (6), the eccentric wheel (4) is mounted on the output end of the drive motor (3), the push-pull block (7) is slidably mounted on the side of the mounting bracket (6), the two ends of the push-pull rod (5) are rotatably connected to the push-pull block (7) and the eccentric wheel (4), and the hammering block (8) is mounted on one end of the push-pull block (7). The position locking mechanism includes a mounting plate (9). The mounting plate (9) is installed on both sides of the mounting bracket (6). Multiple sets of adjustment holes (10) are set on the side plate (2). The clamping pipe (11) is fixedly installed on the mounting plate (9). The rotating toothed rod (13) is rotatably installed in the side wall of the clamping pipe (11). The embedding groove (15) is set on the side wall of the clamping rod (12). The rotating block (14) is installed on the rotating toothed rod (13) and rotates into the embedding groove (15).

2. The paper pulp screening device according to claim 1, characterized in that: The snap-fit ​​auxiliary mechanism includes a rotating sleeve (16), an internal gear ring (17), ball blocks (18), an outer fixed plate (19), a counter-shrinking block (20), a fixed block (21), and a counter-shrinking spring (22). The rotating sleeve (16) is rotatably mounted on the outer wall of the snap-fit ​​tube (11). The internal gear ring (17) is mounted on the inner wall of the rotating sleeve (16). The internal gear ring (17) is meshed with one end of the rotating gear rod (13). Multiple sets of ball blocks (18) are mounted on the top end of the rotating sleeve (16). The outer fixed plate (19) is mounted on the outer wall of the snap-fit ​​tube (11). Multiple sets of counter-shrinking blocks (20) are arranged in a ring at the bottom end of the outer fixed plate (19). The counter-shrinking spring (22) is mounted between the fixed block (21) and the counter-shrinking block (20).

3. The paper pulp screening device according to claim 1, characterized in that: The bottom end of the conveying and screening assembly (1) is provided with a discharge bucket (23), and the hammering block (8) repeatedly hammers the side wall of the discharge bucket (23).

4. The paper pulp screening device according to claim 1, characterized in that: The bottom end of the conveying and screening assembly (1) is provided with a frame (24), and the side plate (2) is installed on the side of the frame (24).

5. The paper pulp screening device according to claim 1, characterized in that: The mounting bracket (6) is equipped with a guide rod (25), and the push-pull block (7) is slidably guided on the guide rod (25).

6. The paper pulp screening device according to claim 1, characterized in that: One end of the snap-fit ​​rod (12) is equipped with a limiting block (26), and one end face of the limiting block (26) is in contact with the bottom end of the side plate (2).

7. The paper pulp screening device according to claim 2, characterized in that: The bottom end face of the outer fixed plate (19) is provided with a radial rail (27), and the shrink block (20) is set to slide radially on the radial rail (27).

8. The paper pulp screening device according to claim 1, characterized in that: A connecting plate (28) is installed at the bottom of the side wall of the card tube (11), and the connecting plate (28) is fixedly installed on the mounting plate (9).

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