Fiber classifying screen for pulping and process thereof

Abstract

The invention discloses a fiber classifying screen for pulping and a process thereof, and relates to the technical field of papermaking, the fiber classifying screen comprises a treatment box, a positioning plate is mounted in the treatment box, the lower end of the positioning plate is slidably connected with a screening plate, and a driving motor is mounted at the upper end of the side of the treatment box; and the output end of the driving motor extends into the treatment box and is provided with a shifting mechanism for separating long and short fibers. According to the fiber classifying screen for pulping and the technology thereof, the output end of the driving motor rotates and drives the reciprocating screw rod to rotate, the reciprocating screw rod is in threaded connection with the sliding block, and therefore the sliding block is driven to move; the sliding block can drive the fixing plate and the fixing strip to stir paper pulp stored at the upper end in the treatment box when moving, the paper pulp is screened in a classified mode through the screening plate, the paper pulp at different positions in the treatment box can be stirred through the fixing strip, and therefore the situation that fibers with different lengths cannot be separated due to lap joint can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking, in particular to a fiber grading screen for pulping and a process thereof. Background Art

[0002] The fiber grading screen is a device used to separate long and short fibers and impurities in the pulping and papermaking process. Its core function is to improve pulp quality, optimize the process and reduce costs through screening. The use of the grading screen can effectively reduce the cost of subsequent pulp production. During use, since the traditional grading screen is not convenient for moving the pulp accumulated inside, some short fiber pulp will accumulate inside the pulp during grading and screening, affecting the screening effect.

[0003] In order to overcome the above-mentioned defects, the first prior art (Announcement No. CN214362521U, Chinese Patent Publication Date 2021-10-08) is a fiber grading screen, which includes a box body and a screening barrel detachably arranged in the box body, the opening directions of the box body and the screening barrel are both vertically upward, a screen plate for screening impurities and long fibers is installed in the screening barrel, two opposite inner side surfaces of the box body are provided with a sliding assembly that can move in the vertical direction, the screening barrel and the sliding assembly are detachably connected, and a driving assembly is provided on the two opposite side surfaces of the box body and below the sliding assembly, the driving assembly drives the screening barrel to move up and down through the sliding assembly, and the lower side wall of the box body is provided with a discharge port. It has the effect of improving the pulp fiber grading efficiency; the second prior art (Announcement No. CN220919900U, Chinese Patent Publication Date 2024-05-10) is a fiber grading screen for papermaking, which relates to the field of papermaking technology. The fiber grading screen for papermaking has two fixed blocks fixedly connected to the upper surface of the base, and fixed slider grooves are provided on the upper surfaces of the two fixed blocks. Springs are fixedly connected to the upper surfaces of the two fixed slider grooves, and fixed sliders are slidably connected to the inside of the two fixed slider grooves. The threaded rod is driven to rotate by the output end of the motor in the lifting device, and then the limit slider on the threaded rod moves left and right, and the movable connecting rod is driven to rotate by the limit slider, and then the movable connecting rod drives the screen box body to rotate, so that the screen box body is tilted at a certain angle. This avoids the situation where the materials are overlapped due to different crushing states when our equipment is screening the materials, resulting in the material being unable to be screened out during the screening process, thereby protecting the equipment and reducing screen plate blockage.

[0004] The above mechanism realizes fiber screening by moving the screening cylinder up and down, or separates the short fibers and long fibers accumulated inside by adjusting the angle of the screen box. However, in actual use, since there are more materials stored inside the grading screen, the weight of the grading screen itself will increase. When adjusting the angle, the drive component needs to provide a strong driving force to achieve it. Summary of the Invention

[0005] The object of the present invention is to provide a fiber grading screen for pulping and a process thereof to solve the problems raised in the above background technology.

[0006] The discharging opening is arranged on the side of the gear train and the gear train is equipped with a gear and a guide plate, and the guide plate is connected with the gear train by a gear rotation. The discharging opening is arranged on the side of the gear train and the gear train is equipped with a gear. The discharging opening is arranged on the side of the gear train and the gear train is equipped with a gear.

[0007] Furthermore, a scraper is installed at the bottom end of the fixing bar, and the bottom end of the scraper is in contact with the top end of the screening plate.

[0008] Furthermore, a mounting plate is provided at the upper end of the interior of the processing box, and a slider is installed at the top of the sliding block. A slide rail matching the slider is provided at the bottom end of the mounting plate, and a sliding mechanism is formed between the sliding block and the mounting plate through a sliding connection between the slider and the slide rail.

[0009] Furthermore, the front and rear ends of the side of the screen plate are fixedly connected with connecting springs, and the side of the connecting spring is installed with a movable block, and the movable block is arranged outside the processing box. The output end of the driving motor is installed with a cam through a sprocket transmission mechanism, and the cam is arranged above the movable block.

[0010] Furthermore, the side of the movable block is provided with an inclined surface, and the cross section of the movable block is a right-angled trapezoid.

[0011] Furthermore, a pull rod is wound around the outer side of the connecting spring, and an elastic structure is formed between the movable block and the processing box through the pull rod.

[0012] Furthermore, the periodic discharging mechanism includes a telescopic rod, and the telescopic rod is arranged at the front and rear ends of the bottom of the lifting plate. An elastic airbag is attached to the side of the movable block close to the processing box, and the front and rear ends of the elastic airbag are connected to the telescopic rod through a hose.

[0013] Furthermore, the material guide plate is obliquely arranged inside the processing box, and the side of the material guide plate is in contact with the inner side of the processing box.

[0014] Furthermore, the side of the lifting plate passes through the discharge port and extends to the outside of the processing box, and the width of the lifting plate is equal to the width of the discharge port.

[0015] Furthermore, a fiber grading screen for pulping and a process thereof include the following steps:

[0016] S1. The waste paper pulping process can be divided into five modules: pretreatment, crushing, purification, concentration, and post-processing. First, pretreatment such as deinking is carried out, and then the waste paper is broken into small pieces to reduce the impact of large impurities on the equipment. High-concentration hydraulic pulping is performed, and then the pulp is coarsely screened and then finely screened using a grading screen.

[0017] S2. Pulp is added to the inside of the processing box, and the output end of the driving motor rotates and drives the reciprocating screw to rotate. When the sliding block moves, it can drive the fixed plate and the fixed bar to move the pulp stored at the upper end of the processing box. The pulp is graded and screened through the screening plate, and the fixed bar can move the pulp at different positions inside the processing box, so that the long and short fibers inside the pulp can be evenly separated.

[0018] S3. When the output end of the driving motor rotates, it will drive the cam to rotate through the sprocket transmission mechanism. When the cam rotates, it will continuously push the movable block below, so that the inclined surface of the movable block contacts the side of the cam, thereby causing the movable block to move toward the inside of the processing box. When the movable block moves, it will synchronously push the connecting spring to move, and the connecting spring pushes the screening plate to move at the lower end of the positioning plate, so that the surface of the screening plate can continuously move, thereby realizing the graded screening of long and short fibers.

[0019] S4. The elastic airbag is squeezed during the movement of the movable block, and the gas inside the elastic airbag is regularly transported to the interior of the telescopic rod through the hose. The extension rod inside the telescopic rod moves upward, so that the lifting plate at the top of the telescopic rod is also pushed and moved upward synchronously. The guide plate installed on the side of the lifting plate is pushed synchronously, and the side of the guide plate moves upward, so that the angle of the guide plate is deflected. The screened short fibers can be collected by the guide plate, and the short fibers fall on the surface of the guide plate. When the movable block is reset, the elastic airbag stops being squeezed, and the gas inside the elastic airbag automatically resets due to the elastic force and is extracted through the hose. The extension rod of the telescopic rod moves downward, and the lifting plate moves downward synchronously. The deflection angle of the guide plate increases, and the short fiber material is discharged from the interior of the device using the offset angle of the guide plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The output end of the driving motor rotates and drives the reciprocating screw to rotate. The reciprocating screw and the sliding block are threadedly connected, so that the sliding block is driven to move. When the sliding block moves, it can drive the fixed plate and the fixed bar to move the pulp stored at the upper end of the processing box. The pulp is graded and screened through the screening plate. The fixed bar can move the pulp at different positions inside the processing box, thereby effectively avoiding the situation where fibers of different lengths overlap and cannot be separated.

[0022] Furthermore, the mounting plate provided above the sliding block can limit the angle of the sliding block. The sliding block slides inside the slide rail through the slider, so that when the reciprocating screw rotates to drive the sliding block to move, there will be no angular deviation of the sliding block, thereby making the movement of the sliding block smoother.

[0023] Furthermore, the scraper provided at the bottom end of the fixed bar can continuously scrape the surface of the screen plate, so that the fibers accumulated on the surface of the screen plate will be pushed to the side, so that the fibers at other positions inside the processing box can continue to be graded and screened, and the long fibers are separated and stored inside the processing box.

[0024] 2. The cam can be driven to rotate by the sprocket transmission mechanism. When the cam rotates, it will continuously push the movable block below, so that the inclined surface of the movable block contacts the side of the cam, thereby causing the movable block to move toward the inside of the processing box. When the movable block moves, it will synchronously push the connecting spring to move, and the connecting spring pushes the screening plate to move at the lower end of the positioning plate, so that the surface of the screening plate can continuously move, which is convenient for better grading and screening of the fibers.

[0025] Furthermore, the movable block will squeeze the elastic airbag during its movement, and the gas inside the elastic airbag will be regularly transported to the interior of the telescopic rod through the hose. The extension rod inside the telescopic rod will move upward, so that the lifting plate at the top of the telescopic rod is also pushed and moved upward synchronously. The guide plate installed on the side of the lifting plate is pushed synchronously, and the side of the guide plate moves upward, thereby deflecting the angle of the guide plate. The screened short fibers can be collected by the guide plate, and the short fibers fall on the surface of the guide plate. When the movable block is reset, the elastic airbag stops being squeezed, and the gas inside the elastic airbag automatically resets due to elastic force and is extracted through the hose. The extension rod of the telescopic rod moves downward, and the lifting plate moves downward synchronously. The deflection angle of the guide plate increases, and the short fiber material is discharged from the interior of the device using the offset angle of the guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view structural schematic diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention.

[0028] Figure 3 It is a side structural schematic diagram of the present invention.

[0029] Figure 4 It is a structural schematic diagram of the toggle mechanism and screening structure of the present invention.

[0030] Figure 5 It is a bottom view structural diagram of the toggle mechanism and screening structure of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the periodic discharging mechanism of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the toggle mechanism of the present invention.

[0033] Figure 8 It is a structural schematic diagram of the screening structure of the present invention.

[0034] Figure 9 It is a partially enlarged structural schematic diagram of the periodic discharging mechanism of the present invention.

[0035] In the figure: 1. Processing box; 2. Driving motor; 3. Reciprocating screw; 4. Sliding block; 5. Fixed plate; 6. Fixed bar; 7. Mounting plate; 8. Sliding block; 9. Slide rail; 10. Positioning plate; 11. Screening plate; 12. Movable block; 13. Pull-out rod; 14. Connecting spring; 15. Cam; 16. Guide plate; 17. Drain outlet; 18. Lifting plate; 19. Telescopic rod; 20. Elastic airbag; 21. Scraper; 22. Discharge port. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Example 1: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 7The technical solution shown is to solve the problem that the traditional grading screen is not convenient for moving the accumulated pulp inside during use, resulting in some short fiber pulp being accumulated inside the pulp during grading and screening, thereby affecting the screening effect: the fiber grading screen for pulping and its process discloses a moving mechanism, including a processing box 1, a positioning plate 10 is installed inside the processing box 1, and the lower end of the positioning plate 10 is slidably connected to the screening plate 11, a discharge port 22 is provided on the side of the processing box 1, and a drainage port 17 is provided at the middle position of the bottom end of the processing box 1, and a guide plate 16 is rotatably connected to the right side of the lower end of the processing box 1; a driving motor 2 is installed on the upper end of the side of the processing box 1, and the output end of the driving motor 2 extends to The interior of the processing box 1 is provided with a toggle mechanism for separating long and short fibers. The toggle mechanism includes a reciprocating screw 3, and the reciprocating screw 3 is connected to the output end of the drive motor 2 through a coupling. The external thread of the reciprocating screw 3 is connected to a sliding block 4, and a fixed plate 5 is installed at the bottom end of the sliding block 4, and a fixed bar 6 is installed at the bottom end of the fixed plate 5; a scraper 21 is installed at the bottom end of the fixed bar 6, and the bottom end of the scraper 21 is in contact with the top of the screening plate 11; a mounting plate 7 is provided at the upper end of the interior of the processing box 1, and a slider 8 is installed at the top of the sliding block 4, and a slide rail 9 matching the slider 8 is provided at the bottom end of the mounting plate 7. The sliding block 4 and the mounting plate 7 are slidably connected through the slider 8 and the slide rail 9 to form a sliding mechanism.

[0038] In this example, pulp is added to the upper end of the processing box 1, and the output end of the driving motor 2 rotates and drives the reciprocating screw 3 to rotate. The reciprocating screw 3 is threadedly connected to the sliding block 4, so that the sliding block 4 is driven to move. When the sliding block 4 moves, it can drive the fixed plate 5 and the fixed bar 6 to move the pulp stored at the upper end of the processing box 1. The pulp is graded and screened through the screening plate 11. The fixed bar 6 can move the pulp at different positions in the processing box 1, thereby effectively avoiding the situation where fibers of different lengths overlap and cannot be separated; during the movement of the sliding block 4, the mounting plate 7 set above the sliding block 4 can It plays a role in limiting the angle of the sliding block 4. The sliding block 4 slides inside the sliding rail 9 through the slider 8, so that when the reciprocating screw 3 rotates to drive the sliding block 4 to move, there will be no angle deviation of the sliding block 4, so that the movement of the sliding block 4 can be more stable; the scraper 21 set at the bottom end of the fixed bar 6 can continuously scrape the surface of the screen plate 11, so that the fibers accumulated on the surface of the screen plate 11 will be pushed to the side, so that the fibers at other positions inside the processing box 1 can continue to be graded and screened, and the long fibers are separated and stored inside the processing box 1, waiting for the long fiber pulp to be taken out after the grading and screening of the short fiber pulp is completed.

[0039] Example 2: Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 8 The technical solution shown is to solve the problem that when pulp screening is carried out, the position of the screen plate 11 does not change and the surface may be clogged with fibers, affecting the subsequent grading and screening effect: the fiber grading screen for pulping and its process discloses a screening mechanism, the front and rear ends of the side of the screen plate 11 are fixedly connected with connecting springs 14, and the side of the connecting spring 14 is installed with a movable block 12, the movable block 12 is arranged outside the processing box 1, and the output end of the driving motor 2 is installed with a cam 15 through a sprocket transmission mechanism, and the cam 15 is arranged above the movable block 12; the side of the movable block 12 is provided with an inclined surface, and the cross-section of the movable block 12 is a right-angled trapezoid; the outside of the connecting spring 14 is wrapped with a pull rod 13, and an elastic structure is formed between the movable block 12 and the processing box 1 through the pull rod 13.

[0040] In this example, when the output end of the driving motor 2 rotates, it can drive the cam 15 to rotate through the sprocket transmission mechanism. When the cam 15 rotates, it will continuously push the movable block 12 below, so that the inclined surface of the movable block 12 contacts the side of the cam 15, thereby causing the movable block 12 to move toward the inside of the processing box 1. When the movable block 12 moves, it will synchronously push the connecting spring 14 to move. The connecting spring 14 pushes the screening plate 11 to move at the lower end of the positioning plate 10, so that the surface of the screening plate 11 can continuously move, thereby better realizing the graded screening of the fibers. The repeated movement of the screening plate 11 allows the fibers to be in more complete contact with the surface of the screening plate 11, thereby ensuring a better grading and screening effect; after the movable block 12 is pushed by the cam 15, the elastic force of the pull rod 13 can assist the movable block 12 and the connecting spring 14 to reset their positions; the output end of the driving motor 2 synchronously drives the reciprocating screw 3 and the cam 15 to rotate, so that the material inside the processing box 1 can be synchronously moved and the screening plate 11 can be shaken back and forth, thereby ensuring the stability of the device during fiber screening, and effectively avoiding the problem of some materials accumulating and being unable to be screened.

[0041] Example 3: Figure 1 、 Figure 2 、 Figure 4 、 Figure 6 and Figure 9The technical solution shown is to solve the problem that materials may accumulate and cannot be discharged during discharge: the fiber grading screen for pulping and its process discloses a regular discharge mechanism, the internal clamping connection of the discharge port 22 is connected with a lifting plate 18, and the lower part of the lifting plate 18 is provided with a regular discharge mechanism for adjusting the angle of the guide plate 16 for discharge; the internal clamping connection of the discharge port 22 is connected with a lifting plate 18, and the lower part of the lifting plate 18 is provided with a regular discharge mechanism for adjusting the angle of the guide plate 16 for discharge; The material mechanism includes a telescopic rod 19, and the telescopic rod 19 is arranged at the front and rear ends of the bottom of the lifting plate 18. The movable block 12 is attached to the side of the processing box 1 close to the elastic airbag 20, and the front and rear ends of the elastic airbag 20 are connected to the telescopic rod 19 through a hose; the guide plate 16 is tilted and arranged inside the processing box 1, and the side of the guide plate 16 is attached to the inner side of the processing box 1; the side of the lifting plate 18 passes through the discharge port 22 and extends to the outside of the processing box 1, and the width of the lifting plate 18 is equal to the width of the discharge port 22.

[0042] The elastic airbag 20 is squeezed by the movable block 12 during its movement, and the gas inside the elastic airbag 20 is regularly transported to the interior of the telescopic rod 19 through the hose. The extension rod inside the telescopic rod 19 moves upward, so that the lifting plate 18 at the top of the telescopic rod 19 is also pushed and moved upward synchronously. The guide plate 16 installed on the side of the lifting plate 18 is pushed synchronously, and the side of the guide plate 16 moves upward, thereby deflecting the angle of the guide plate 16. The screened short fibers can be collected by the guide plate 16, and the short fibers fall on the surface of the guide plate 16. When the movable block 12 is reset, the elastic airbag 20 stops being squeezed, and the gas inside the elastic airbag 20 is automatically reset due to the elastic force and extracted through the hose. The extension rod of the telescopic rod 19 moves downward, the lifting plate 18 moves downward synchronously, the deflection angle of the guide plate 16 increases, and the short fiber material is discharged from the inside of the device using the offset angle of the guide plate 16. At the same time, the residual water from the separated pulp inside the device is discharged from the inside of the device through the discharge port 22.

[0043] S1. The waste paper pulping process can be divided into five modules: pretreatment, crushing, purification, concentration, and post-treatment. First, pretreatment such as deinking is carried out, and then the waste paper is broken into small pieces to reduce the impact of large impurities on the equipment. The concentration of high-concentration hydraulic pulping is 12%-18%, and the rotor linear speed is 15-20m / s. The pulp is then coarsely screened with an aperture of 1.5-2mm to remove heavy impurities, and then finely screened with a grading screen with an aperture of 0.15-0.3mm to separate long and short fibers.

[0044] S2. Pulp is added to the inside of the processing box 1. The output end of the driving motor 2 rotates and drives the reciprocating screw 3 to rotate. When moving, the sliding block 4 can drive the fixed plate 5 and the fixed bar 6 to move the pulp stored at the upper end of the processing box 1. The pulp is graded and screened through the screening plate 11. The fixed bar 6 can move the pulp at different positions inside the processing box 1, so that the long and short fibers inside the pulp can be evenly separated.

[0045] S3. When the output end of the driving motor 2 rotates, it will drive the cam 15 to rotate through the sprocket transmission mechanism. When the cam 15 rotates, it will continuously push the movable block 12 below, so that the inclined surface of the movable block 12 contacts the side of the cam 15, thereby causing the movable block 12 to move toward the inside of the processing box 1. When the movable block 12 moves, it will synchronously push the connecting spring 14 to move, and the connecting spring 14 pushes the screening plate 11 to move at the lower end of the positioning plate 10, so that the surface of the screening plate 11 can continuously move, thereby realizing the graded screening of long and short fibers.

[0046] S4. The elastic airbag 20 is squeezed by the movable block 12 during its movement, and the gas inside the elastic airbag 20 is regularly transported to the interior of the telescopic rod 19 through the hose. The extension rod inside the telescopic rod 19 moves upward, so that the lifting plate 18 at the top of the telescopic rod 19 is also pushed and moved upward synchronously. The guide plate 16 installed on the side of the lifting plate 18 is pushed synchronously, and the side of the guide plate 16 moves upward, thereby deflecting the angle of the guide plate 16. The screened short fibers can be collected by the guide plate 16, and the short fibers fall on the surface of the guide plate 16. When the movable block 12 is reset, the elastic airbag 20 stops being squeezed, and the gas inside the elastic airbag 20 is automatically reset due to the elastic force and extracted through the hose. The extension rod of the telescopic rod 19 moves downward, and the lifting plate 18 moves downward synchronously. The deflection angle of the guide plate 16 increases, and the short fiber material is discharged from the interior of the device using the offset angle of the guide plate 16.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A fiber grading screen for pulping, comprising a processing box (1), a positioning plate (10) installed inside the processing box (1), and a screening plate (11) slidably connected to the lower end of the positioning plate (10), a discharge port (22) is provided on the side of the processing box (1), and a drainage port (17) is provided at the middle position of the bottom end of the processing box (1), and a guide plate (16) is rotatably connected to the right side of the lower end of the processing box (1); Its characteristics are: A driving motor (2) is installed at the upper end of the side of the processing box (1), and the output end of the driving motor (2) extends to the interior of the processing box (1) and is provided with a toggle mechanism for separating long and short fibers, the toggle mechanism comprising a reciprocating screw (3), and the reciprocating screw (3) is connected to the output end of the driving motor (2) through a coupling, the external thread of the reciprocating screw (3) is connected to a sliding block (4), and a fixing plate (5) is installed at the bottom end of the sliding block (4), and a fixing bar (6) is installed at the bottom end of the fixing plate (5); The discharge port (22) is internally engaged with a lifting plate (18), and a regular discharge mechanism for adjusting the angle of the guide plate (16) for discharge is provided below the lifting plate (18).

2. A fiber grading screen for pulping according to claim 1, characterized in that: A scraper (21) is installed at the bottom end of the fixing bar (6), and the bottom end of the scraper (21) is in contact with the top end of the screening plate (11).

3. A fiber grading screen for pulping according to claim 2, characterized in that: A mounting plate (7) is provided at the upper end of the interior of the processing box (1), and a slider (8) is installed at the top end of the sliding block (4). A slide rail (9) matching the slider (8) is provided at the bottom end of the mounting plate (7). The sliding block (4) and the mounting plate (7) are slidably connected via the slider (8) and the slide rail (9) to form a sliding mechanism.

4. A fiber grading screen for pulping according to claim 3, characterized in that: The front and rear ends of the side of the screening plate (11) are fixedly connected with connecting springs (14), and the side of the connecting spring (14) is installed with a movable block (12), and the movable block (12) is arranged outside the processing box (1). The output end of the driving motor (2) is installed with a cam (15) through a sprocket transmission mechanism, and the cam (15) is arranged above the movable block (12).

5. A fiber grading screen for pulping according to claim 4, characterized in that: The side of the movable block (12) is provided with an inclined surface, and the cross section of the movable block (12) is in the shape of a right-angled trapezoid.

6. A fiber grading screen for pulping according to claim 5, characterized in that: A pull rod (13) is wound around the outside of the connecting spring (14), and an elastic structure is formed between the movable block (12) and the processing box (1) through the pull rod (13).

7. A fiber grading screen for pulping according to claim 6, characterized in that: The periodic discharge mechanism includes a telescopic rod (19), and the telescopic rod (19) is arranged at the front and rear ends of the bottom of the lifting plate (18). An elastic airbag (20) is attached to the side of the movable block (12) close to the processing box (1), and the front and rear ends of the elastic airbag (20) are connected to the telescopic rod (19) through a hose.

8. The fiber grading screen for pulping according to claim 7, characterized in that: The guide plate (16) is arranged obliquely inside the processing box (1), and the side of the guide plate (16) is in contact with the inner side of the processing box (1).

9. The fiber grading screen for pulping according to claim 8, characterized in that: The side of the lifting plate (18) passes through the discharge port (22) and extends to the outside of the processing box (1), and the width of the lifting plate (18) is equal to the width of the discharge port (22).

10. A fiber grading screen for pulping and a process thereof, applied to the fiber grading screen for pulping according to claim 9, characterized in that: The steps include: S1. The waste paper pulping process can be divided into five major modules: pretreatment, crushing, purification, concentration, and post-treatment. First, pretreatment such as deinking is carried out, and then the waste paper is broken into small pieces to reduce the impact of large impurities on the equipment. High-concentration hydraulic pulping (concentration 12%-18%, rotor linear speed 15-20m / s) is performed, and then the pulp is coarsely screened (pore size 1.5-2mm, to remove heavy impurities), and then finely screened using a grading screen (pore size 0.15-0.3mm, to separate long and short fibers). S2. Pulp is added to the interior of the processing box (1). The output end of the driving motor (2) is rotated and drives the reciprocating screw (3) to rotate. When the sliding block (4) moves, it can drive the fixed plate (5) and the fixed bar (6) to move the pulp stored at the upper end of the processing box (1). The pulp is graded and screened by the screening plate (11). The fixed bar (6) can move the pulp at different positions in the processing box (1), so that the long and short fibers in the pulp can be evenly separated. S3, when the output end of the driving motor (2) rotates, it can drive the cam (15) to rotate through the sprocket transmission mechanism. When the cam (15) rotates, it will continuously push the movable block (12) below, so that the inclined surface of the movable block (12) contacts the side of the cam (15), thereby causing the movable block (12) to move toward the inside of the processing box (1). When the movable block (12) moves, it will synchronously push the connecting spring (14) to move. The connecting spring (14) pushes the screening plate (11) to move at the lower end of the positioning plate (10), so that the surface of the screening plate (11) can continuously move, thereby realizing the graded screening of long and short fibers. S4. The elastic airbag (20) is squeezed by the movable block (12) during the movement, and the gas inside the elastic airbag (20) is regularly transported to the inside of the telescopic rod (19) through the hose. The extension rod inside the telescopic rod (19) moves upward, so that the lifting plate (18) at the top of the telescopic rod (19) is also pushed and moved upward synchronously. The guide plate (16) installed on the side of the lifting plate (18) is also pushed synchronously, and the side of the guide plate (16) moves upward, so that the guide plate (16) ) is deflected at an angle, and the guide plate (16) can be used to collect the short fibers screened out. The short fibers fall on the surface of the guide plate (16). When the movable block (12) is reset, the elastic airbag (20) stops being squeezed, and the gas inside the elastic airbag (20) is automatically reset due to elastic force and drawn out through the hose. The extension rod of the telescopic rod (19) moves downward, and the lifting plate (18) moves downward synchronously. The deflection angle of the guide plate (16) increases, and the short fiber materials are discharged from the interior of the device using the offset angle of the guide plate (16).

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