Paper pulp pressurized screen and using method thereof

Abstract

The invention belongs to the technical field of papermaking, and particularly relates to a paper pulp pressurized screen and a using method thereof. Comprising an equipment base, a screening tank body is arranged on the equipment base, a screening cavity is formed in the screening tank body and sequentially comprises a heavy slag settling area, an accepted pulp screening area and a light slag floating area from bottom to top in the height direction, the screening cylinder is arranged in the accepted pulp screening area, and the lower portion of the screening cylinder abuts against a first partition plate. The screening drum divides the accepted pulp screening area into a to-be-screened area and a finished screening area, the finished screening area is communicated with the pulp outlet pipe, a screening seam is formed in the side wall of the screening drum, a rotor is rotationally arranged on the inner side of the screening drum, a turbulent flow unit is arranged on the rotor, and the turbulent flow unit can eject pulp on the inner side of the rotor to the screening drum and destroy a pulp layer formed on the side wall of the inner side of the screening drum; and the situation that a relatively stable slurry layer is formed on the inner wall side of the screen cylinder by part of slurry to be screened under the action of centrifugal force, so that new slurry is prevented from being screened through screen seams can be avoided, and the screening efficiency is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking, and in particular relates to a pulp pressure screen and a use method thereof. Background Art

[0002] With the development of the papermaking industry, the requirements for paper quality are getting higher and higher. As the main raw material for papermaking, the quality of pulp is directly related to the quality of the final product. Pulp usually contains various impurities, such as fiber bundles, sand and gravel, paper scraps, etc. These impurities will affect the quality and appearance of the paper and may even damage the papermaking equipment. As a key equipment, the pressure screen is widely used in the purification process of pulp. It drives the rotor to rotate at high speed through the internal rotor, generating a strong centrifugal force, which effectively promotes the separation of fibers and impurities in the pulp. This centrifugal force causes the heavy impurities in the pulp to quickly settle to the bottom and be discharged smoothly through the specially designed bottom discharge port, thereby avoiding the influence of heavy impurities on subsequent processes. At the same time, light impurities mix with the air in the pulp, naturally rise to the top, and are discharged through the top discharge port, further ensuring the purity of the pulp.

[0003] However, although the existing technology has achieved effective screening of pulp to a certain extent, there are still some problems that need to be solved. Among them, a significant problem is that when the rotor drives the rotor to rotate, a strong centrifugal force is generated. This centrifugal force not only promotes the separation of fibers and impurities in the pulp, but also causes part of the pulp to be screened to form a relatively stable pulp layer on the inner wall side of the screen drum. This layer of pulp is tightly attached to the inner wall due to the centrifugal force and is not easy to be broken, thereby preventing new pulp from being screened through the screen gap, resulting in a decrease in screening efficiency and affecting the smooth progress of the entire papermaking process. Summary of the invention

[0004] The purpose of the present invention is to provide a pulp pressure screen and a method of using the same in response to the above-mentioned technical problems, which can prevent part of the pulp to be screened from forming a relatively stable pulp layer on the inner wall side of the screen drum under the action of centrifugal force, thereby hindering new pulp from being screened through the screen gap, thereby ensuring screening efficiency.

[0005] In view of this, the present invention provides a pulp pressure screen, including an equipment base, a screen tank body is provided on the equipment base, a screening chamber is arranged in the screen tank body, the screening chamber is composed of a heavy slag sedimentation area, a good pulp screening area and a light slag floating area from bottom to top along the height direction, and is respectively connected with a pulp inlet pipe, a pulp outlet pipe and a light slag discharge pipe, a heavy slag discharge pipe is also provided at the bottom of the screening chamber, and a screen drum is also provided in the good pulp screening area, the lower part of the screen drum abuts against a first partition plate, the screen drum divides the good pulp screening area into a waiting screening area and a finished screening area, the finished screening area is connected with the pulp outlet pipe, a screen slot is opened on the side wall of the screen drum, a rotor is rotatably arranged on the inner side of the screen drum, a spoiler unit is arranged on the rotor, the spoiler unit can draw the pulp on the inner side of the rotor toward the screen drum, and destroy the pulp layer formed on the inner wall of the screen drum.

[0006] The slurry enters the screening area through the screen slots on the screen drum and leaves the screening area through the screen outlet pipe. The slurry moves along the screen slots to the top of the screen and then moves to the bottom of the screen.

[0007] In the above technical scheme, further, the screen drum is a cylindrical structure with upper and lower openings, the bottom of the screen drum is fixedly arranged on the first partition plate, the first partition plate is horizontally fixedly arranged on the inner wall of the screen tank body, the first partition plate separates the good pulp screening area and the heavy slag sedimentation area, and a slurry supply channel connecting the good pulp screening area and the heavy slag sedimentation area is arranged on the first partition plate, the slurry supply channel is a circular opening coaxially arranged with the screen drum, and the radial dimension of the slurry supply channel is smaller than the radial dimension of the screen drum.

[0008] In the present technical solution, the heavy slag sedimentation area and the good pulp screening area are separated by a first partition plate. A slurry supply channel is provided on the first partition plate for the slurry to pass after the heavy slag sedimentation is completed. The slurry supply channel is a circular opening coaxially arranged with the screen drum. The radial dimension of the slurry supply channel is smaller than the radial dimension of the screen drum, which can ensure that the slurry enters the waiting area for screening in the good pulp screening area, and avoids the slurry entering the good pulp screening area from flowing out of the slurry outlet pipe without being screened.

[0009] In the above technical solution, further, the rotor is a cylindrical structure with openings at the top and bottom, a fixed plate is provided on the inner side of the rotor, a rotating shaft is coaxially connected through the fixed plate, one end of the rotating shaft passes through the bottom plate and is connected to a driving device in the base, and the central axis of the rotating shaft coincides with the screen drum.

[0010] In the present technical solution, the driving device is a transmission device through a transmission belt, gears and a motor, which can drive the rotating shaft to rotate in the screening chamber. It is a common structure for driving the rotor to rotate in the prior art and will not be described in detail.

[0011] In the above technical solution, further, the spoiler unit is a guide block circumferentially arranged around the outer wall of the rotor, a first chamber is arranged on the inner side of the guide block, a through groove connecting the first chamber is arranged through the rotor corresponding to the first chamber, and a slurry introduction channel is arranged on the side of the first chamber of the guide block away from the first chamber.

[0012] In the present technical solution, part of the slurry enters the inner side of the rotor, and part of the slurry enters between the rotor and the screen drum. The rotation of the rotor generates centrifugal force, and part of the slurry on the inner side of the rotor enters the first chamber in the guide block through the through groove on the rotor, and is further introduced to the screen drum through a narrow slurry introduction channel. The cross-sectional shape of the slurry introduction channel is not limited to the rectangular shape set in the embodiment, and circular shapes and the like are also acceptable.

[0013] In the above technical solution, further, the guide block includes a fixed surface abutting against the outer wall of the rotor, the side opposite the fixed side is a slurry induction surface, the radial angle a between the slurry induction surface and the rotor is 90 degrees, and the slurry induction channel is a through opening perpendicular to the slurry induction surface for slurry to pass through.

[0014] In this technical solution, it is possible to ensure that after the slurry enters the guide block, it is ejected toward the screen drum at a high speed and direction through the narrow slurry introduction channel, thereby more effectively destroying the slurry layer close to the inner wall of the screen drum. Since the slurry introduction channel is perpendicular to the slurry introduction surface, the slurry will generate a strong impact force when passing through, which helps to remove impurities near the screen gap, prevent blockage, and keep the screen gap unobstructed.

[0015] In the above technical solution, further, the two sides of the slurry inlet surface and the fixed surface are respectively set as the slurry facing surface and the back slurry surface, and the tangent angle b at the connection between the slurry inlet surface and the outer wall of the rotor is 50°<b<65°, and the tangent angle c at the connection between the back slurry surface and the outer wall of the rotor is 15°<c<35°.

[0016] In the above technical solution, further, several of the spoiler units are grouped together, several groups of the spoiler units are arranged around the circumference of the rotor, a single group of the spoiler units is arranged along the height direction of the shaft, and adjacent groups of the spoiler units are staggered.

[0017] In this technical solution, more optimized fluid dynamics performance is achieved, and the guide blocks can play the role of wing plates on the rotor surface, effectively guiding the flow of slurry, reducing the generation of turbulence and eddies, thereby improving the energy efficiency of the entire system.

[0018] In the above technical solution, it further includes a heavy slag pusher plate coaxially fixedly connected to the rotating shaft, the heavy slag pusher plate is arranged in the heavy slag sedimentation area, and the heavy slag pusher plate can push the heavy slag settled on the bottom plate to be discharged from the heavy slag discharge pipe arranged on the bottom plate when rotating.

[0019] In this technical solution, it is helpful to avoid the continuous accumulation of heavy slag in the heavy slag sedimentation area. The continuous accumulation of heavy slag will occupy the space of the sedimentation area, reduce the effective volume available for new pulp processing, and lead to a decrease in screening efficiency. At the same time, if the heavy slag is not removed in time, it may enter the good pulp screening area, causing wear on the rotor and screen drum, affecting the screening effect.

[0020] In the above technical solution, further, a heavy slag intercepting net is provided in the heavy slag sedimentation area. The heavy slag intercepting net is an inverted cone-shaped screen with a downward opening in the middle. The heavy slag intercepting net is horizontally arranged above the heavy slag push plate and fixedly connected to the inner wall of the screen tank body.

[0021] In this technical solution, it is avoided that when the flow rate of the slurry inlet pipe is high, the heavy residue in the slurry is carried into the good slurry screening area without being fully precipitated.

[0022] Also included is a method for grinding and polishing the above pulp pressure screen, comprising the following steps:

[0023] S1: Preparation stage, ensure that all connecting pipes and equipment components have been correctly installed and fixed, check whether the screen drum, rotor and spoiler unit are intact, ensure that there is no blockage or damage, confirm that the power supply and control system are normal, and prepare to start the equipment;

[0024] S2: Start the equipment, open the slurry inlet pipe valve, let the slurry enter the heavy slag precipitation area of ​​the screening chamber, start the driving device, make the rotor start to rotate, and drive the drainage unit to generate centrifugal force;

[0025] S3: During the screening process, the heavy slag quickly settles to the bottom and is discharged through the bottom heavy slag discharge pipe. The heavy slag pusher plate, driven by the rotating shaft, pushes the heavy slag deposited at the bottom to the heavy slag discharge pipe. The slurry in the good slurry screening area is screened by the screen gap of the screen drum and then leaves from the slurry outlet pipe. Part of the slurry enters between the rotor and the screen drum and enters the guide block to be ejected toward the screen drum during the rotation of the rotor, thereby destroying the slurry layer close to the inner wall of the screen drum. The light slag is retained in the area to be screened and the air in the slurry naturally rises to the light slag floating area at the top and leaves from the light slag discharge pipe.

[0026] S4: Real-time monitoring of the operating status of the equipment, including the pulp flow rate, slag discharge and the quality of the good pulp. Real-time monitoring of the operating status of the equipment, including the pulp flow rate, slag discharge and the quality of the good pulp.

[0027] In this technical solution,

[0028] The beneficial effects of the present invention are:

[0029] 1. The slurry enters the heavy residue sedimentation area in the screening chamber from the slurry inlet pipe on the bottom side. The heavy residue in the slurry completes sedimentation in the heavy residue sedimentation area and leaves the screen tank body from the heavy residue discharge pipe at the bottom to complete discharge, thereby preventing the heavy residue from entering the good slurry screening area and causing wear to the rotor and the screen drum during the operation of the rotor. The slurry enters the inner side of the screen drum in the good slurry screening area (i.e., the waiting area). The rotation of the rotor generates centrifugal force. The good slurry enters the finished screening area through the screen slits set on the screen drum and leaves from the slurry outlet pipe. The light residue is retained in the waiting area and the air in the slurry naturally rises to the light residue floating area at the top and leaves from the light residue discharge pipe. At the same time, the turbulence unit arranged on the rotor can rotate with the rotor to generate centrifugal force to screen the slurry, and can also draw the slurry on the inner side of the rotor to the screen drum, thereby preventing part of the slurry to be screened from forming a relatively stable slurry layer on the inner wall side of the screen drum under the action of centrifugal force, thereby preventing new slurry from being screened through the screen slits, resulting in a decrease in screening efficiency.

[0030] 2. It also includes a heavy slag push plate coaxially fixedly connected to the rotating shaft, and the heavy slag push plate is arranged in the heavy slag precipitation area. The heavy slag push plate can push the heavy slag settled on the bottom plate to be discharged from the heavy slag discharge pipe arranged on the bottom plate when rotating, which helps to avoid the continuous accumulation of heavy slag in the heavy slag precipitation area. The continuous accumulation of heavy slag will occupy the space of the precipitation area, reduce the effective volume that can be used for the treatment of new slurry, and lead to the decrease of screening efficiency. At the same time, if the heavy slag is not removed in time, it may enter the good slurry screening area, causing wear on the rotor and the screen drum, and affecting the screening effect;

[0031] 3. A heavy slag intercepting net is also provided in the heavy slag sedimentation area. The heavy slag intercepting net is an inverted cone-shaped screen with a downward opening in the middle. The heavy slag intercepting net is horizontally arranged above the heavy slag pushing plate and fixedly connected to the inner wall of the screen tank body to prevent the heavy slag in the slurry from being carried into the good slurry screening area without sufficient sedimentation when the flow rate of the slurry inlet pipe is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0033] Figure 2 This is a front view of the rotor and spoiler unit;

[0034] Figure 3 It is a top view of the rotor and spoiler unit;

[0035] Figure 4 It is a three-dimensional view of the rotor and the spoiler unit;

[0036] Figure 5 is a partial cross-sectional view of the rotor and the spoiler unit;

[0037] Figure 6 yes Figure 5 A partial enlarged view of the middle A;

[0038] Figure 7 It is a partial cross-sectional view of the rotor and the spoiler unit.

[0039] The symbols in the figure are:

[0040] 1. Equipment base; 2. Screen tank body; 3. Heavy slag sedimentation area; 4. Good pulp screening area; 5. Light slag floating area; 6. Slurry inlet pipe; 7. Slurry outlet pipe; 8. Light slag discharge pipe; 9. Heavy slag discharge pipe; 10. Screen drum; 11. First partition plate; 12. Waiting area for screening; 13. Finished screening area; 14. Rotor; 15. Turbine unit; 16. Slurry supply channel; 17. Fixed plate; 18. Rotating shaft; 19. First chamber; 20. Through groove; 21. Slurry introduction channel; 22. Fixed surface; 23. Slurry introduction surface; 24. Slurry facing surface; 25. Back slurry surface; 26. Heavy slag push plate; 27. Bottom plate; 28. Heavy slag intercepting net. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0042] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0044] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0045] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0046] First embodiment:

[0047] like Figure 1-7As shown, the present embodiment provides a pulp pressure screen, comprising an equipment base 1, on which a screen tank body 2 is provided, a screening chamber is arranged in the screen tank body 2, the screening chamber is composed of a heavy residue sedimentation area 3, a good pulp screening area 4 and a light residue floating area 5 from bottom to top along the height direction, and is respectively connected with a pulp inlet pipe 6, a pulp outlet pipe 7 and a light residue discharge pipe 8, a heavy residue discharge pipe 9 is also arranged at the bottom of the screening chamber, and a screen drum 10 is also arranged in the good pulp screening area 4, the lower part of the screen drum 10 abuts against a first partition plate 11, the screen drum 10 divides the good pulp screening area 4 into a waiting screening area 12 and a finished screening area 13, the finished screening area 13 is connected with the pulp outlet pipe 7, a screen slot is opened on the side wall of the screen drum 10, a rotor 14 is rotatably arranged on the inner side of the screen drum 10, a spoiler unit 15 is arranged on the rotor 14, and the spoiler unit 15 can inject the pulp on the inner side of the rotor 14 to the screen drum 10, so as to destroy the pulp layer formed on the inner wall side of the screen drum 10.

[0048] The slurry enters the heavy slag settling area 3 in the screening chamber from the slurry inlet pipe 6 at the bottom side, and the heavy slag in the slurry completes sedimentation in the heavy slag settling area 3 and leaves the screen tank body 2 from the heavy slag discharge pipe 9 at the bottom to complete the discharge, thereby preventing the heavy slag from entering the good slurry screening area 4. During the operation of the rotor 14, the rotor 14 and the screen drum 10 are worn. The slurry enters the inner side of the screen drum 10 in the good slurry screening area 4 (i.e., the waiting screening area 12) upwardly, and the rotation of the rotor 14 generates centrifugal force. The good slurry enters the finished screening area 13 through the screen slits set on the screen drum 10 and leaves from the slurry outlet pipe 7, while the light slag The air retained in the area to be screened 12 and the slurry naturally rises to the light slag floating area 5 at the top and leaves from the light slag discharge pipe 8. At the same time, the turbulence unit 15 arranged on the rotor 14 can not only rotate with the rotor 14 to generate centrifugal force to screen the slurry, but also can inject the slurry inside the rotor 14 to the screen drum 10, so as to avoid that part of the slurry to be screened forms a relatively stable slurry layer on the inner wall side of the screen drum 10 under the action of centrifugal force, thereby hindering new slurry from being screened through the screen gap, resulting in a decrease in screening efficiency.

[0049] like Figure 1 and Figure 3 As shown, the screen drum 10 is a cylindrical structure with openings at the top and bottom. The bottom of the screen drum 10 is fixedly arranged on the first partition plate 11. The first partition plate 11 is horizontally fixedly arranged on the inner wall of the screen tank body 2. The first partition plate 11 separates the good pulp screening area 4 and the heavy slag sedimentation area 3. The first partition plate 11 is provided with a slurry supply channel 16 connecting the good pulp screening area 4 and the heavy slag sedimentation area 3. The slurry supply channel 16 is a circular opening coaxially arranged with the screen drum 10, and the radial dimension of the slurry supply channel 16 is smaller than the radial dimension of the screen drum 10.

[0050] The heavy slag sedimentation area 3 and the good pulp screening area 4 are separated by a first partition plate 11. The first partition plate 11 is provided with a slurry supply channel 16 for the slurry to pass after the heavy slag sedimentation is completed. The slurry supply channel 16 is a circular opening coaxially arranged with the screen drum 10. The radial dimension of the slurry supply channel 16 is smaller than the radial dimension of the screen drum 10, which can ensure that the slurry enters the waiting area 12 in the good pulp screening area 4, and avoids the slurry entering the good pulp screening area 4 from flowing out of the slurry outlet pipe 7 without being screened.

[0051] like Figure 1 and Figure 3 , Figure 4 As shown, the rotor 14 is a cylindrical structure with openings at the top and bottom. A fixed plate 17 is provided on the inner side of the rotor 14, and a rotating shaft 18 is coaxially connected to the fixed plate 17. One end of the rotating shaft 18 passes through the bottom plate 27 and is connected to a driving device in the base for transmission. The rotating shaft 18 coincides with the central axis of the screen drum 10.

[0052] The driving device is a transmission device through a transmission belt, gears, and a motor, which can drive the rotating shaft 18 to rotate in the screening chamber. It is a common structure in the prior art for driving the rotor 14 to rotate, and will not be described in detail.

[0053] like Figure 1-6 As shown, the spoiler unit 15 is a guide block circumferentially arranged around the outer wall of the rotor 14, and a first chamber 19 is arranged on the inner side of the guide block. A through groove 20 connecting to the first chamber 19 is arranged through the rotor 14 corresponding to the first chamber 19, and a slurry introduction channel 21 is arranged on the side of the first chamber 19 of the guide block away from the first chamber 19.

[0054] Part of the slurry enters the inner side of the rotor 14, and part of the slurry enters between the rotor 14 and the screen drum 10. The rotation of the rotor 14 generates centrifugal force. Part of the slurry on the inner side of the rotor 14 enters the first chamber 19 in the guide block through the through groove 20 on the rotor 14, and is further introduced to the screen drum 10 through the narrow slurry introduction channel 21. The cross-sectional shape of the slurry introduction channel 21 is not limited to the rectangular shape set in the embodiment, and circular shapes are also acceptable.

[0055] like Figure 5 and Figure 7 As shown, the guide block includes a fixed surface 22 that abuts against the outer wall of the rotor 14, and the opposite side of the fixed side is a slurry inducing surface 23. The radial angle a between the slurry inducing surface 23 and the rotor 14 is 90 degrees. The slurry inducing channel 21 is a through opening perpendicular to the slurry inducing surface 23 for slurry to pass through.

[0056] It is possible to ensure that after the slurry enters the guide block, it is ejected toward the screen drum 10 at a high speed and direction through the narrow slurry introduction channel 21, thereby more effectively destroying the slurry layer close to the inner wall of the screen drum 10. Since the slurry introduction channel 21 is perpendicular to the slurry introduction surface 23, the slurry will generate a strong impact force when passing through, which helps to remove impurities near the screen gap, prevent blockage, and keep the screen gap unobstructed.

[0057] like Figure 7 As shown, the two sides of the slurry introducing surface 23 and the fixed surface 22 are respectively set as the slurry facing surface 24 and the back slurry surface 25, the tangent angle b at the connection between the slurry introducing surface 23 and the outer side wall of the rotor 14 is 50°<b<65°, and the tangent angle c at the connection between the back slurry surface 25 and the outer side wall of the rotor 14 is 15°<c<35°.

[0058] like Figure 2-Figure 4 As shown, several spoiler units 15 form a group, and several groups of spoiler units 15 are arranged around the circumference of the rotor 14. A single group of spoiler units 15 is arranged along the height direction of the shaft, and adjacent groups of spoiler units 15 are staggered.

[0059] A more optimized fluid dynamics performance is achieved, and the guide block can play the role of a wing plate on the surface of the rotor 14, effectively guiding the flow of slurry, reducing the generation of turbulence and eddy currents, thereby improving the energy efficiency of the entire system.

[0060] Also included is a method for using the pulp pressure screen, comprising the following steps:

[0061] S1: Preparation stage, ensure that all connecting pipes and equipment components have been correctly installed and fixed, check whether the screen drum 10, rotor 14 and spoiler unit 15 are intact, ensure that there is no blockage or damage, confirm that the power supply and control system are normal, and prepare to start the equipment;

[0062] S2: Start the equipment, open the valve of the pulp inlet pipe 6, let the pulp enter the heavy slag precipitation area 3 of the screening chamber, start the driving device, make the rotor 14 start to rotate, and drive the drainage unit to generate centrifugal force;

[0063] S3: During the screening process, the heavy slag quickly settles to the bottom and is discharged through the bottom heavy slag discharge pipe 9. The heavy slag push plate 26 pushes the heavy slag deposited at the bottom to the heavy slag discharge pipe 9 driven by the rotating shaft 18. The slurry in the good pulp screening area 4 is screened by the screen gap of the screen drum 10 and then leaves from the slurry outlet pipe 7. Part of the slurry enters between the rotor 14 and the screen drum 10 and enters the guide block to be ejected toward the screen drum 10 during the rotation of the rotor 14, thereby destroying the slurry layer close to the inner wall of the screen drum 10. The light slag is retained in the to-be-screened area 12 and the air in the slurry naturally rises to the light slag floating area 5 at the top and leaves from the light slag discharge pipe 8.

[0064] S4: Real-time monitoring of the operating status of the equipment, including the pulp flow rate, slag discharge and the quality of the good pulp. Real-time monitoring of the operating status of the equipment, including the pulp flow rate, slag discharge and the quality of the good pulp.

[0065] Second embodiment:

[0066] This embodiment provides a pulp pressure screen, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0067] like Figure 1 As shown, it also includes a heavy slag pusher plate 26 coaxially fixedly connected to the rotating shaft 18. The heavy slag pusher plate 26 is arranged in the heavy slag sedimentation area 3. The heavy slag pusher plate 26 can push the heavy slag settled on the bottom plate 27 to be discharged from the heavy slag discharge pipe 9 arranged on the bottom plate 27 when rotating.

[0068] It helps to avoid the continuous accumulation of heavy slag in the heavy slag sedimentation area 3. The continuous accumulation of heavy slag will occupy the space in the sedimentation area, reduce the effective volume available for new slurry processing, and cause a decrease in screening efficiency. At the same time, if the heavy slag is not removed in time, it may enter the good slurry screening area 4, causing wear on the rotor 14 and the screen drum 10, affecting the screening effect.

[0069] like Figure 1 As shown, a heavy slag intercepting net 28 is also provided in the heavy slag precipitation area 3. The heavy slag intercepting net 28 is an inverted cone-shaped screen with a downward opening in the middle. The heavy slag intercepting net 28 is horizontally arranged above the heavy slag pushing plate 26 and fixedly connected to the inner wall of the screen tank body 2.

[0070] It is to avoid that when the flow rate of the slurry inlet pipe 6 is too high, the heavy residue in the slurry is carried into the good slurry screening area 4 without being fully precipitated.

[0071] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A pulp pressure screen, characterized in that: The device comprises an equipment base (1), a screen tank body (2) is arranged on the equipment base (1), a screening chamber is arranged in the screen tank body (2), the screening chamber is composed of a heavy slag sedimentation area (3), a good pulp screening area (4) and a light slag floating area (5) from bottom to top in the height direction, and is respectively connected with a pulp inlet pipe (6), a pulp outlet pipe (7) and a light slag discharge pipe (8), and a heavy slag discharge pipe (9) is also arranged at the bottom of the screening chamber. The device is characterized in that the device further comprises a screen drum (10) arranged in the good pulp screening area (4), and the lower part of the screen drum (10) Abutting against the first partition plate (11), the screen drum (10) divides the good pulp screening area (4) into a waiting screening area (12) and a finished screening area (13); the finished screening area (13) is connected to the pulp outlet pipe (7); a screen slot is provided on the side wall of the screen drum (10); a rotor (14) is rotatably arranged inside the screen drum (10); a spoiler unit (15) is arranged on the rotor (14); the spoiler unit (15) can eject the pulp inside the rotor (14) toward the screen drum (10) to destroy the pulp layer formed on the inner wall of the screen drum (10).

2. The pulp pressure screen according to claim 1, characterized in that: The screen drum (10) is a cylindrical structure with openings at the top and bottom. The bottom of the screen drum (10) is fixedly arranged on a first partition plate (11). The first partition plate (11) is horizontally fixedly arranged on the inner wall of the screen tank body (2). The first partition plate (11) separates the good pulp screening area (4) and the heavy slag precipitation area (3). The first partition plate (11) is provided with a pulp supply channel (16) connecting the good pulp screening area (4) and the heavy slag precipitation area (3). The pulp supply channel (16) is a circular opening coaxially arranged with the screen drum (10). The radial dimension of the pulp supply channel (16) is smaller than the radial dimension of the screen drum (10).

3. The pulp pressure screen according to claim 1, characterized in that: The rotor (14) is a cylindrical structure with openings at the top and bottom. A fixed plate (17) is arranged inside the rotor (14). A rotating shaft (18) is coaxially connected to the fixed plate (17). One end of the rotating shaft (18) passes through a bottom plate (27) and is transmission-connected to a driving device in the base. The central axis of the rotating shaft (18) coincides with the central axis of the screen drum (10).

4. The pulp pressure screen according to claim 3, characterized in that: The flow disturbance unit (15) is a guide block circumferentially arranged around the outer wall of the rotor (14); a first chamber (19) is arranged on the inner side of the guide block; a through groove (20) communicating with the first chamber (19) is arranged through the rotor (14) corresponding to the first chamber (19); and a slurry introduction channel (21) is arranged on the side of the first chamber (19) of the guide block away from the first chamber (19).

5. The pulp pressure screen according to claim 4, characterized in that: The guide block comprises a fixed surface (22) abutting against the outer wall of the rotor (14); the side opposite the fixed side is a slurry introduction surface (23); the radial angle a between the slurry introduction surface (23) and the rotor (14) is 90 degrees; and the slurry introduction channel (21) is a through opening perpendicular to the slurry introduction surface (23) for slurry to pass through.

6. The pulp pressure screen according to claim 5, characterized in that: The two sides of the slurry introducing surface (23) and the fixed surface (22) are respectively arranged as a slurry facing surface (24) and a back slurry surface (25); the tangent angle b at the connection between the slurry introducing surface (23) and the outer side wall of the rotor (14) is 50°<b<65°; the tangent angle c at the connection between the back slurry surface (25) and the outer side wall of the rotor (14) is 15°<c<35°.

7. The pulp pressure screen according to claim 6, characterized in that: A plurality of the spoiler units (15) form a group, and the plurality of groups of the spoiler units (15) are arranged around the circumference of the rotor (14). A single group of the spoiler units (15) is arranged along the height direction of the rotating shaft, and adjacent groups of the spoiler units (15) are arranged in a staggered manner.

8. The pulp pressure screen according to claim 1, characterized in that: It also includes a heavy slag push plate (26) coaxially fixedly connected to the rotating shaft (18), the heavy slag push plate (26) being arranged in the heavy slag precipitation area (3), and the heavy slag push plate (26) being able to push the heavy slag settled on the bottom plate (27) to be discharged from the heavy slag discharge pipe (9) arranged on the bottom plate (27) when rotating.

9. The pulp pressure screen according to claim 8, characterized in that: A heavy slag intercepting net (28) is also provided in the heavy slag precipitation area (3). The heavy slag intercepting net (28) is an inverted cone-shaped screen with a downward opening in the middle. The heavy slag intercepting net (28) is horizontally arranged above the heavy slag pushing plate (26) and is fixedly connected to the inner wall of the sieve tank body (2).

10. A method for using a pulp pressure screen according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Preparation stage, ensure that all connecting pipes and equipment components have been correctly installed and fixed, check whether the screen drum (10), rotor (14) and spoiler unit (15) are intact, ensure that there is no blockage or damage, confirm that the power supply and control system are normal, and prepare to start the equipment; S2: Start the equipment, open the valve of the pulp inlet pipe (6), allow the pulp to enter the heavy slag precipitation area (3) of the screening chamber, start the driving device, make the rotor (14) start to rotate, and drive the drainage unit to generate centrifugal force; S3: During the screening process, the heavy slag quickly settles to the bottom and is discharged through the bottom heavy slag discharge pipe (9). The heavy slag push plate (26) pushes the heavy slag deposited at the bottom toward the heavy slag discharge pipe (9) driven by the rotating shaft (18). The slurry in the good slurry screening area (4) is screened by the sieve gap of the screen drum (10) and then leaves from the slurry outlet pipe (7). Part of the slurry enters between the rotor (14) and the screen drum (10) and enters the guide block during the rotation of the rotor (14) to be ejected toward the screen drum (10), thereby destroying the slurry layer closely attached to the inner wall of the screen drum (10). The light slag is retained in the waiting screening area (12) and the air in the slurry naturally rises to the light slag floating area (5) at the top and leaves from the light slag discharge pipe (8); S4: Real-time monitoring of the operating status of the equipment, including the pulp flow rate, slag discharge and the quality of the good pulp. Real-time monitoring of the operating status of the equipment, including the pulp flow rate, slag discharge and the quality of the good pulp.

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