A headbox for papermaking

Abstract

The present application discloses a headbox for papermaking, comprising a base for providing support force, a pulp discharging mechanism arranged on the base and used to assist pulp to be sprayed onto a paper forming net, the pulp discharging mechanism comprising a pulp discharging box, an upper lip plate and a lower lip plate are arranged inside the pulp discharging box, a lip for pulp discharging is formed between the upper lip plate and the lower lip plate, a pulp discharging mechanism for extracting excess accumulated pulp is arranged on the side of the pulp discharging box near the lip, a scraper for blocking excess pulp is connected to the side wall of the pulp discharging box, the pulp discharging mechanism comprises a bottom plate, a vertical plate is fixedly connected to the bottom plate, a plurality of transmission components for taking away excess pulp are arranged between the bottom plate and the scraper, the transmission components comprise a plurality of rollers, the same group of rollers are connected to the same belt for transmission, a water bucket for containing pulp is fixedly connected to the side of the belt away from the roller, and a driving mechanism for driving the roller to rotate is arranged in the extraction groove. The pulp accumulation is reduced, and the influence on paper forming is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking equipment, and in particular to a headbox for papermaking. Background Art

[0002] The headbox is an auxiliary device for papermaking and has been widely used in the field of pulp processing. One end of the headbox is connected to the short circulation through the pulp inlet pipe, and the other end transports the pulp to the paper forming net through the lip flow channel to form paper. The design and adjustment of the headbox will affect the composition and dynamic characteristics of the pulp, thereby changing the quality of the paper. The flow of slurry in the headbox is driven by pressure. The pressure of the slurry flow is generated by the pulp pump and adjusted by the control system.

[0003] There is a headbox device for paper production, which includes a pulp feeding mechanism, a pulp dilution mechanism, a pulp processing mechanism and a pulp discharge mechanism. The pulp dilution mechanism is connected to the pulp feeding mechanism and is used to dilute the pulp concentration in the pulp feeding mechanism; the pulp processing mechanism is connected to the pulp feeding mechanism and is used to perform turbulent flow treatment on the pulp; the pulp discharge mechanism is connected to the pulp processing mechanism and is used to discharge pulp of different angles and flow rates to act on a paper forming net to form paper; a scraper is provided on the side of the pulp discharge mechanism close to the paper forming net, which is used to block the excessively thick pulp on the paper forming net so that the paper is formed at a constant thickness.

[0004] With regard to the above-mentioned related technologies, the slurry is prone to accumulation at the scraper. When the accumulation is excessive, the fibers and flocs in the accumulated slurry are prone to combine together, which will affect the paper forming effect. Summary of the invention

[0005] In order to improve the paper forming effect, the present application provides a headbox for papermaking, which is mainly achieved through the following technical solutions.

[0006] A headbox for papermaking comprises a base for providing a supporting force, a discharge mechanism arranged on the base and used for assisting slurry to be sprayed onto a paper forming net, the discharge mechanism comprising a discharge box, an upper lip plate and a lower lip plate are arranged inside the discharge box, a lip for slurry discharge is formed between the upper lip plate and the lower lip plate, a slurry extraction mechanism for extracting excess accumulated slurry is provided on the side of the discharge box close to the lip, a scraper for blocking excess slurry is connected to the side wall of the discharge box, the slurry extraction mechanism comprises a bottom plate, a vertical plate is fixedly connected to the bottom plate, a plurality of transmission components for taking away excess slurry are arranged between the vertical plate and the scraper, the transmission components comprise a plurality of rollers, the rollers in the same group are transmission-connected with the same belt, a water bucket for containing slurry is fixedly connected to the side of the belt away from the roller, and a driving mechanism for driving the rollers to rotate is provided on the bottom plate.

[0007] Through the above technical solution, the slurry in the slurry discharge box is discharged from the lip and falls on the paper forming net to form paper. The scraper scrapes the slurry on the paper forming net and retains the excess slurry in place. The roller drives the belt transmission, and then the water bucket on the belt scrapes the deposited slurry so that the excess slurry enters the water bucket. As the roller rotates, the slurry in the water bucket is thrown outward under the action of centrifugation and enters the extraction tank, thereby reducing the accumulation of slurry on the paper forming net and reducing the influence of excessive slurry on the paper forming quality.

[0008] Optionally, the highest point of the topmost roller in the same group of rollers is higher than the highest point of the vertical section of the vertical plate, and the side of the water bucket away from the belt is close to the inner wall of the scraper.

[0009] Through the above technical solution, when the water bucket rotates with the belt to the highest point of the roller, the slurry in the water bucket is thrown outward due to the influence of centrifugal force and can smoothly enter the extraction groove, reducing the possibility that the slurry in the water bucket cannot be thrown into the extraction groove; the water bucket is close to the inner wall of the scraper, so that during the movement of the water bucket, the scraper has a blocking effect on the slurry in the water bucket, reducing the loss of slurry in the water bucket.

[0010] Optionally, the driving mechanism includes a transmission shaft, all rollers at the same height are fixedly connected to the same transmission shaft, all transmission shafts are rotatably connected to the side wall of the pulp discharge box, the side wall of the pulp discharge box is fixedly connected to a driving motor, and the output shaft of the driving motor passes through the side wall of the pulp discharge box and is coaxially fixedly connected to a transmission shaft.

[0011] Through the above technical solution, all rollers at the same height are connected to the same transmission shaft. The driving motor drives the transmission shaft to rotate, which can drive all rollers at the same height to rotate. The roller drives the belt transmission so that the water bucket on the belt also rotates, so that excess slurry can be removed.

[0012] Optionally, the bottom plate is tilted, and the side wall of the pulp discharge box is connected to a pipe for extracting slurry from the bottom plate. The lowest end of the bottom plate is located at one end of the pipe connected to the pulp discharge box, and the pipe outlet is connected to a pulp collection box for temporarily collecting slurry.

[0013] Through the above technical solution, the bottom wall of the extraction tank is inclined so that the slurry in the extraction tank can move to the pipeline by its own gravity, and then be discharged into the pulp collection box through the pipeline for temporary storage for subsequent use.

[0014] Optionally, a scraper 2 is provided inside the bottom plate for scraping residual slurry on the bottom plate, the bottom end of the scraper 2 contacts the bottom plate, the side wall of the slurry discharge box is provided with a slide groove for sliding of the scraper 2, the end of the scraper 2 away from the slide groove is slidably connected to the vertical plate, the slide groove is inclined and the degree of inclination is consistent with the degree of inclination of the bottom plate, and the side wall of the slurry discharge box is rotatably connected to a driving member for driving the scraper 2 to move.

[0015] Through the above technical solution, there will be residues on the bottom plate of the extraction tank. The scraper 2 is used to send the residual slurry on the bottom plate to the pipe outlet for discharge and collection, thereby reducing the waste of slurry.

[0016] Optionally, the driving member includes a screw, both ends of which are rotatably connected to the two side walls of the base plate in a one-to-one manner, the second scraper is threadedly connected to the screw, and the side wall of the pulp discharge box is fixedly connected to a rotating motor, which is penetrated through the side wall of the pulp discharge box and fixedly connected to the screw coaxially.

[0017] Through the above technical solution, the motor drives the screw to rotate, thereby driving the second scraper to move to scrape the bottom plate of the extraction trough.

[0018] Optionally, the base is fixedly connected to a box body, and a stirring barrel for evenly mixing the slurry is provided inside the box body. The top wall of the stirring barrel is open to facilitate the entry of slurry, and through holes for the circulation of slurry are evenly provided on the body of the stirring barrel. A second rotating motor is fixedly connected to the center position of the top wall of the box body, and the output shaft of the second rotating motor is coaxially fixedly connected to a stirring shaft, and a paddle is fixedly connected to the stirring shaft.

[0019] Through the above technical solution, the original pulp for making paper and the cooling water for diluting the original pulp enter the mixing barrel, and the rotating motor 2 drives the blades to rotate through the mixing shaft, so that the original pulp and the dilution water in the mixing barrel are fully mixed, reducing the possibility of insufficient dilution.

[0020] Optionally, the center position of the bottom wall of the box body is connected to a rotating motor three for driving the mixing barrel to rotate, and the output shaft of the rotating motor three passes through the bottom wall of the box body and is fixedly connected to the center position of the bottom wall of the mixing barrel.

[0021] Through the above technical solution, the slurry in the mixing barrel is sent out by utilizing the centrifugal force generated by the rotation of the mixing barrel itself, and the rotation of the mixing barrel itself can also disperse the fibers and accumulated flocs in the slurry.

[0022] Optionally, the box body is connected to a buffer chamber for slurry transition, and a plurality of pipe bundle branches for balancing the lateral pressure of the slurry are connected between the box body and the buffer chamber, and each pipe bundle branch is arranged obliquely.

[0023] Through the above technical solution, the tube bundle branch is used to balance the lateral pressure and full-width pulp velocity of the pulp flow; the buffer chamber is used for uniform flow of the pulp flow.

[0024] Optionally, the buffer chamber is connected to a turbulence chamber for turbulent treatment of slurry, the turbulence chamber is communicated with the tube bundle branch pipes, a group of first turbulence branch pipes and a group of second turbulence branch pipes are respectively provided inside the turbulence chamber, a branch pipe connecting part is connected between the first turbulence branch pipes and the second turbulence branch pipes, a rotating roller for changing the flow direction of the slurry and dispersing the fibers in the slurry is provided inside the branch pipe connecting part, and annular grooves for the slurry flow are evenly arranged on the outer wall of the rotating roller.

[0025] Through the above technical scheme, when the slurry flows out of the branch pipe connecting part from the first turbulent branch pipe, it flows through the rotating roller. The annular groove on the rotating roller changes the flow direction of the slurry, so that the slurry forms a vortex and continues to flow to form turbulence. The fibers in the slurry are not easy to gather together, and then enter the slurry discharge box from the second turbulent branch pipe for discharge.

[0026] In summary, the water bucket is driven to rotate by rollers and belts to extract the excess slurry accumulated between the lip and the scraper, thereby reducing the quality change of the slurry at the lip and the possibility of errors in paper forming; the water bucket sends the slurry into the extraction tank and then into the pulp collection box. When the slurry in the pulp collection box reaches a certain amount, the slurry in the pulp collection box is re-proportioned and diluted and then put into production use to reduce the waste of slurry; the stirring shaft in the mixing barrel drives the blades to rotate while the mixing barrel itself rotates, which enhances the stirring effect and allows the fibers and flocs in the slurry to be fully dispersed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of this application.

[0028] Figure 2 It is a cross-sectional view of the mixing barrel and the buffer chamber in this application.

[0029] Figure 3 is a cross-sectional view of the turbulence chamber in this application.

[0030] Figure 4 It is a schematic diagram of the structure of the rotating roller in this application.

[0031] Figure 5 It is a cross-sectional view of the pulp discharge mechanism in this application.

[0032] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0033] Figure 7 It is a schematic diagram of the extraction mechanism in this application.

[0034] Description of reference numerals:

[0035] 1. Base; 2. Discharge mechanism; 3. Discharge box; 4. Upper lip plate; 5. Lower lip plate; 6. Lip; 7. Slurry extraction mechanism; 8. Scraper; 9. Bottom plate; 10. Transmission assembly; 11. Roller; 12. Belt; 13. Vertical plate; 14. Water bucket; 15. Driving mechanism; 16. Transmission shaft; 17. Driving motor; 18. Pipeline; 19. Slurry collecting box; 20. Scraper II; 21. Chute; 22. Driving member; 23. Screw; 24. Rotating motor I; 25. Mixing barrel; 26 , through hole; 27, box body; 28, stirring shaft; 29, impeller; 30, rotating motor two; 31, rotating motor three; 32, buffer chamber; 33, tube bundle branch; 34, turbulence chamber; 35, first turbulence branch; 36, second turbulence branch; 37, branch pipe connecting part; 38, rotating roller; 39, annular groove; 40, slurry inlet part; 41, dilution part; 42, branch pipe; 43, valve; 44, round hole; 45, square hole; 46, support; 47, side wall of slurry discharge box; 48, guide rod. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings.

[0037] The present application discloses a headbox for papermaking, referring to Figure 1 and Figure 2 , including a base 1, the base 1 includes a plurality of pillars 46, the pillars 46 are connected to a box 27, the upper surface of the top wall of the box 27 is provided with a slurry inlet 40 and a dilution part 41, the slurry inlet 40 and the dilution part 41 are connected with a branch pipe 42 near one end of the box, each branch pipe 42 is provided with a valve 43 for controlling the flow of the branch pipe, a stirring barrel 25 is provided inside the box 27, the top of the stirring barrel 25 is open, each branch pipe 42 is penetrated through the top wall of the box 27 and connected to the stirring barrel 25, a rotating motor 30 is fixedly connected at the center of the top wall of the box 27, and the rotating motor 30 is fixedly connected to the center of the top wall of the box 27. The output shaft of motor 2 30 is coaxially fixedly connected to a stirring shaft 28, to which a paddle 29 for stirring the slurry is fixedly connected, a rotating motor 31 is fixedly connected to the bottom wall of the box body 27, the output shaft of the rotating motor 31 passes through the bottom wall of the box body 27 and is coaxially fixedly connected to the bottom wall of the stirring barrel 25, the barrel body of the stirring barrel 25 is provided with a plurality of groups of through holes 26 for the slurry to flow out, each group of multiple through holes 26 is distributed in a circular array around the axis of the stirring barrel 25 on the side wall of the stirring barrel 25, and each group of through holes 26 is parallel and equidistantly distributed along the length direction of the stirring barrel.

[0038] The original pulp and cooling water for making paper enter the mixing barrel 25 from the pulp inlet section 40 and the dilution section 41 through the branch pipe 42 respectively. The valve 43 on the branch pipe 42 controls the amount of the pulp inlet section 40 and the dilution section 41, so as to dilute the original pulp according to a certain ratio. When the original pulp and cooling water enter the mixing barrel 25, the rotary motor 2 30 drives the blade 29 to rotate through the stirring shaft 28 so as to fully mix the original pulp and the cooling water for dilution. At the same time, the mixing barrel 25 is also driven by the rotary motor 31 to rotate so as to make the pulp in the mixing barrel 25 flow out from the through hole 26 to the inner cavity of the box body 27. The rotation direction of the mixing barrel 25 is opposite to that of the stirring shaft 28, so as to better disperse the fibers and large flocs in the pulp.

[0039] Reference Figure 2 The box body 27 is provided with a buffer chamber 32, which is connected to the support 46. The length of the buffer chamber 32 is consistent with the width of the paper forming network. A plurality of tube bundle branches 33 for slurry circulation are connected between the box body 27 and the buffer chamber 32. Each tube bundle branch 33 is inclined, and each tube bundle branch 33 is not parallel to each other and does not intersect each other.

[0040] The buffer chamber 32 is provided to allow the slurry flowing out of the box 27 to form a width consistent with the width of the paper forming mesh. The cross-sectional areas between the buffer chamber 32 and the box 27 are inconsistent, so the tube bundle branch 33 is arranged at an angle. The tube bundle branch 33 is used to reduce the slurry flow pressure loss, and the buffer chamber 32 is used to balance the lateral pressure and full-width slurry velocity of the slurry flow flowing out of the mixing barrel 25.

[0041] Reference Figure 3 and Figure 4 The buffer chamber 32 is provided with a turbulence chamber 34, and the turbulence chamber 34 is connected to the support 46. A group of multiple first turbulence branches 35 and a group of multiple second turbulence branches 36 are provided inside the turbulence chamber 34. Each first turbulence branch 35 and each second turbulence branch 36 are connected by a branch connecting portion 37. Each first turbulence branch 35 is connected to the buffer chamber 32. Each first turbulence branch 35 is a round tube. The branch connecting portion 37 is provided near one end of the first turbulence branch 35. A circular hole 44 is provided for inserting a turbulent branch pipe 35, a rotating roller 38 is provided at the center position inside the branch pipe connecting portion 37, an annular groove 39 is provided on the circumferential outer wall of the rotating roller 38, the second turbulent branch pipe 36 is a square tube, and a square hole 45 for inserting the second turbulent branch pipe 36 is provided at one end of the branch pipe connecting portion 37 away from the first turbulent branch pipe 35, the second turbulent branch pipe 36 is connected to the square hole 45, and the cross-sectional area of ​​the second turbulent branch pipe 36 is greater than the cross-sectional area of ​​the first turbulent branch pipe 35.

[0042] The slurry flows from the buffer chamber 32 into the turbulence chamber 34, and flows from the first turbulence branch pipe 35 through the branch pipe connecting portion 37 to contact the rotating roller 38. The slurry flows through the annular groove 39 on the rotating roller 38, generating eddy currents to form turbulence, and then enters the second turbulence branch pipe 36. Since the cross-sectional area of ​​the second turbulence branch pipe 36 is larger than the cross-sectional area of ​​the first turbulence branch pipe 35, the slurry enters the second turbulence branch pipe 36 to increase the contact area, thereby achieving a better effect in generating slurry turbulence.

[0043] Reference Figure 5 and Figure 6 The turbulence chamber 34 is connected to a pulp discharge mechanism 2, which includes a pulp discharge box 3 for storing pulp, the pulp discharge box 3 is connected to a support 46, an upper lip plate 4 and a lower lip plate 5 are provided in the pulp discharge box, the upper lip plate 4 is connected to the inner wall of the side wall 47 of the pulp discharge box, and the lower lip plate 5 is connected to the bottom wall of the pulp discharge box 3. The gap between the upper lip plate 4 and the lower lip plate 5 forms a lip 6, and the pulp is discharged from the lip 6 onto the paper forming net. The pulp discharge box 3 is provided with a scraper 8 for scraping excess pulp on the paper forming net. The pulp discharge box 3 is connected to a pulp extractor for extracting excess pulp. The liquid extraction mechanism 7 includes a bottom plate 9, which is fixedly connected to the outer wall of the side wall 47 of the pulp discharge box. The lowest point of the bottom plate 9 is higher than the highest point of the upper lip plate 4. The side of the bottom plate 9 away from the side wall 47 of the pulp discharge box is fixedly connected with a vertical plate 13. Both ends of the bottom plate 9 and the vertical plate 13 in the length direction are fixedly connected to the inner walls on both sides of the length direction of the pulp discharge box 3. A transmission component 10 for conveying slurry with force is provided between the vertical plate 13 and the scraper 8. The side wall of the pulp discharge box 3 in the width direction of the bottom plate 9 is connected to a driving mechanism 15 for driving the transmission component 10 to move.

[0044] Reference Figure 7 The transmission component 10 includes an array of rollers 11, each group of two rollers 11, the array of rollers 11 are parallel to each other and are evenly spaced along the length direction of the bottom plate 9, the same group of two rollers 11 are connected by a same belt 12, the two rollers 11 in the same group are distributed up and down, the highest point of the upper roller 11 in the same group of two rollers 11 is higher than the highest point of the vertical plate 13, the lower roller 11 in the same group of two rollers 11 is close to the paper forming net, and the surface of each group of belts 12 away from the rollers 11 is fixedly connected to a water bucket 14 for scraping and containing the accumulated slurry, and the side of the water bucket 14 away from the belt 12 is close to the inner wall of the scraper 8.

[0045] Reference Figure 5 and Figure 6The driving mechanism 15 includes a transmission shaft 16. All rollers 11 at the same height are connected to the same transmission shaft 16. The two transmission shafts 16 are rotatably connected to the two side walls of the pulp discharge box 3 in the length direction. The side wall 47 of the pulp discharge box is connected to a driving motor 17 for driving the transmission shaft 16 to rotate. The output shaft of the driving motor 17 passes through the side wall of the pulp discharge box 3 and is coaxially fixed to a transmission shaft 16.

[0046] The drive motor 17 drives the transmission shaft 16 to rotate, so that all the rollers 11 at the same height rotate counterclockwise, and the belt 12 is driven by the roller 11, and then the water bucket 14 also rotates counterclockwise. When the water bucket 14 contacts the slurry, the slurry is scraped so that the slurry enters the water bucket 14. When the water bucket 14 moves upward to the highest point of the upper roller 11 of the two rollers 11 in the same group, the rotation of the water bucket 14 generates a certain centrifugal force, so that the slurry in the water bucket 14 is thrown toward the bottom plate 9 and enters the bottom plate 9.

[0047] Reference Figure 5 and Figure 6 A pipe 18 is connected to one side of the pulp discharge box 3 in the length direction, and an end of the pipe 18 away from the bottom plate 9 is connected to a pulp collecting box 19 for collecting excess pulp. The bottom plate of the bottom plate 9 is tilted, and the lowest point of the bottom plate 9 is located at one end of the pulp discharge box 3 connected to the pipe 18. The bottom plate 9 is connected to a scraper 20 for scraping the bottom plate. The scraper 20 is L-shaped, and the length direction of the scraper 20 is consistent with the length direction of the bottom plate 9. The side wall 47 of the pulp discharge box is provided with a slide groove 21 for the scraper 20 to slide. The slide groove 21 is tilted and the degree of inclination is consistent with the degree of inclination of the bottom plate 9. The two ends of the horizontal section of the scraper 20 are placed in the slide groove 21 one by one, and the scraper 20 is connected to a driving member 22 for driving the scraper 2 to move. The moving part 22 includes a screw 23. The top end of the vertical section of the scraper 20 is threadedly connected to the screw 23. The screw 23 is placed in a slide groove 21 close to one side of the pulp discharge box 3. The screw 23 is tilted and the degree of tilt is consistent with the degree of tilt of the bottom plate 9. Both ends of the screw 23 are rotatably connected to the two side walls of the pulp discharge box 3 in the length direction. The bottom end of the vertical section of the scraper 20 is slidably connected to a guide rod 48. Both ends of the guide rod 48 are fixedly connected to the two side walls of the pulp discharge box 3 in the length direction. The guide rod 48 is tilted and the degree of tilt is consistent with the degree of tilt of the bottom plate 9. The side wall of the pulp discharge box 3 is fixedly connected to a rotating motor 24. The output shaft of the rotating motor 24 passes through the side of the pulp discharge box 3 in the length direction and is coaxially fixedly connected to the screw 23.

[0048] The slurry in the water bucket 14 is thrown into the bottom plate 9 due to the centrifugal force during the rotation of the belt 12. The slurry in the bottom plate 9 flows into the pipe 18 from the inclined bottom plate of the bottom plate 9 by its own gravity, and then enters the slurry collection box 19 for storage. The slurry has a certain adhesion, and there will be residues on the bottom plate of the bottom plate 9. The rotating motor 1 24 drives the scraper 2 20 to move through the screw 23, so that the scraper 20 scrapes the residual slurry on the bottom plate of the bottom plate 9, reducing the waste of slurry.

[0049] The implementation principle of a headbox for papermaking in the embodiment of the present application is as follows: the valves 43 of the pulp inlet part 40 and the dilution part 41 are opened, the stock liquid and cooling water flow into the stirring barrel 25 from the branch pipe 42, the rotating motor 2 30 drives the blade 29 to rotate through the stirring shaft 28, mixes the stock liquid with water to dilute the stock liquid, and at the same time the rotating motor 31 drives the stirring barrel 25 to rotate itself, the rotation direction of the stirring barrel 25 is opposite to the rotation direction of the stirring shaft 28, the rotation of the stirring barrel 25 itself drives the slurry in the stirring barrel into the inner cavity of the box body 27 from the through hole 26, and then The slurry flows from the box body 27 into the buffer chamber 32 through the tube bundle branch 33, and flows from the buffer chamber 32 through the first turbulence branch 35, the branch pipe connecting part 37 and the second turbulence branch 36 of the turbulence chamber 34 respectively. The slurry flows into the rotating roller 38 in the branch pipe connecting part 37. The annular groove 39 on the rotating roller 38 changes the flow direction of the slurry, so that the slurry forms turbulence in the turbulence chamber 34. Then the slurry enters the pulp discharge box 3 from the second turbulence branch 36, and flows out from the lip 6 between the upper lip plate 4 and the lower lip plate 5. The slurry adheres to the paper forming mesh for paper forming.

[0050] When the paper forming net is driven through the scraper 8, the scraper 8 spreads the slurry on the paper forming and intercepts the excess slurry. The driving motor 17 drives the transmission shaft 16 to rotate and then drives the roller 11 to rotate. The roller 11 drives the belt 12 to drive and the water bucket 14 also moves accordingly. When the water bucket 14 contacts the slurry, the slurry is scraped, so that the slurry enters the water bucket 14. The water bucket 14 moves upward under the drive of the belt 12. When the water bucket 14 starts to rotate counterclockwise near the end of the bottom plate 9 When the paper is turned, the slurry in the water bucket 14 moves parabolically toward the bottom plate 9 under the action of centrifugal force, so that the slurry enters the bottom plate 9, and the slurry moves downward to the pipe 18 on the inclined bottom plate of the bottom plate 9 by its own gravity, and flows into the pulp collection box 19 from the pipe 18 for collection. When the slurry in the pulp collection box 19 reaches a certain amount, the slurry in the pulp collection box 19 is transported to the pulp inlet part 40, re-proportioned with the dilution water, and then the mixed and diluted slurry is repeated again to make paper.

[0051] The slurry in the bottom plate 9 is easily adsorbed on the bottom wall of the bottom plate 9. The rotating motor 1 24 drives the scraper 20 to move through the screw 23, so that the scraper 20 scrapes the slurry remaining on the bottom plate of the bottom plate 9, and then flows from the pipeline 18 into the slurry collection box 19 for storage, reducing the waste of slurry.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A headbox for papermaking, comprising a base (1) for providing a supporting force, and a discharge mechanism (2) arranged on the base (1) and used to assist the slurry to be sprayed onto a paper forming net, characterized in that: The pulp discharge mechanism (2) comprises a pulp discharge box (3), an upper lip plate (4) and a lower lip plate (5) are arranged inside the pulp discharge box (3), a lip (6) for pulp discharge is formed between the upper lip plate (4) and the lower lip plate (5), a pulp discharge mechanism (7) for extracting excess accumulated pulp is arranged on the side of the pulp discharge box (3) close to the lip plate (6), a scraper (8) for blocking excess pulp is connected to the side wall of the pulp discharge box (3), the pulp discharge mechanism (7) comprises a bottom plate (9), the bottom plate (9) is fixedly connected to a vertical plate (13), a plurality of transmission components (10) for taking away excess pulp are arranged between the vertical plate (13) and the scraper (8), the transmission components (10) comprise a plurality of rollers (11), and the rollers (11) in the same group are connected to each other. The transmission is connected with the same belt (12), and a water bucket (14) for containing slurry is fixedly connected to the side of the belt (12) away from the roller (11). The bottom plate (9) is provided with a driving mechanism (15) for driving the roller (11) to rotate. The base (1) is fixedly connected with a box (27), and a stirring barrel (25) for mixing slurry evenly is provided inside the box (27). The top wall of the stirring barrel (25) is open for easy slurry feeding. Through holes (26) for slurry circulation are evenly provided on the barrel body of the stirring barrel (25). A rotating motor (30) is fixedly connected at the center position of the top wall of the box (27), and the output shaft of the rotating motor (30) is coaxially fixedly connected with a stirring shaft (28), and the stirring shaft (28) is fixedly connected with a stirring shaft (28). The box (27) is fixedly connected with a paddle (29), the center position of the bottom wall of the box (27) is connected to a rotating motor three (31) for driving the stirring barrel (25) to rotate, the output shaft of the rotating motor three (31) is passed through the bottom wall of the box (27) and is fixedly connected to the center position of the bottom wall of the stirring barrel (25), the rotation direction of the stirring barrel (25) is opposite to the rotation direction of the stirring shaft (28), the highest point of the topmost roller (11) in the same group of rollers (11) is higher than the highest point of the vertical section of the vertical plate (13), the side of the water bucket (14) away from the belt (12) is close to the inner wall of the scraper (8), the bottom plate (9) is inclined, the side wall of the slurry discharge box (3) is connected to a pipe (18) for extracting slurry from the bottom plate (9), and the bottom The lowest end of the plate (9) is located at one end of the pipe (18) connected to the pulp discharge box (3), and the outlet of the pipe (18) is connected to the pulp collection box (19) for temporarily collecting pulp. A scraper plate 2 (20) is arranged inside the bottom plate (9) for scraping the residual pulp on the bottom plate (9). The bottom end of the scraper plate 2 (20) contacts the bottom plate (9). The side wall of the pulp discharge box (3) is provided with a slide groove (21) for the scraper plate 2 (20) to slide. The end of the scraper plate 2 (20) away from the slide groove (21) is slidably connected to the vertical plate (13). The slide groove (21) is inclined and the degree of inclination is consistent with the degree of inclination of the bottom plate (9). The side wall of the pulp discharge box (3) is rotatably connected to a driving member (22) for driving the scraper plate 2 (20) to move.

2. A headbox for papermaking according to claim 1, characterized in that: The driving mechanism (15) comprises a transmission shaft (16), all rollers (11) at the same height are fixedly connected to the same transmission shaft (16), all transmission shafts (16) are rotatably connected to the side wall of the pulp discharge box (3), the side wall of the pulp discharge box (3) is fixedly connected to a driving motor (17), and the output shaft of the driving motor (17) passes through the side wall of the pulp discharge box (3) and is coaxially fixedly connected to a transmission shaft (16).

3. A headbox for papermaking according to claim 1, characterized in that: The driving member (22) comprises a screw rod (23), the two ends of which are rotatably connected to the two side walls of the bottom plate (9) in a one-to-one manner, the scraper plate (20) is threadedly connected to the screw rod (23), and the side wall of the pulp discharge box (3) is fixedly connected to a rotating motor (24), which is inserted through the side wall of the pulp discharge box (3) and is coaxially fixedly connected to the screw rod (23).

4. A headbox for papermaking according to claim 1, characterized in that: The box body (27) is connected to a buffer chamber (32) for slurry transition, and a plurality of tube bundle branches (33) for balancing the lateral pressure of the slurry are connected between the box body (27) and the buffer chamber (32), and each tube bundle branch (33) is arranged obliquely.

5. A headbox for papermaking according to claim 4, characterized in that: The buffer chamber (32) is connected to a turbulence chamber (34) for turbulent flow treatment of the slurry. The turbulence chamber (34) is communicated with the tube bundle branch pipe (33). A group of first turbulence branch pipes (35) and a group of second turbulence branch pipes (36) are respectively arranged inside the turbulence chamber (34). A branch pipe connecting portion (37) is connected between the first turbulence branch pipes (35) and the second turbulence branch pipes (36). A rotating roller (38) for changing the flow direction of the slurry and dispersing the fibers in the slurry is arranged inside the branch pipe connecting portion (37). An annular groove (39) for the slurry to flow is evenly arranged on the outer wall of the rotating roller (38).

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