Paper pulp deslagging device and deslagging method thereof

Abstract

The invention belongs to the technical field of papermaking, and particularly relates to a paper pulp deslagging device and a deslagging method thereof. Comprising the following steps: a primary screening device screens out primary discharged liquid containing large particles and heavy impurities from slurry fed into the primary screening device to obtain primary slurry subjected to primary screening, and a fine screening device screens out secondary discharged liquid containing fine impurities from the primary slurry subjected to primary screening to obtain screened slurry subjected to fine screening; the secondary screening device is used for carrying out secondary screening on the primary discharged liquid obtained by the primary screening device and the secondary discharged liquid obtained by the fine screening device to obtain tertiary discharged liquid, and the tertiary discharged liquid is put into the fine screening device again for fine screening; the re-screening device is additionally arranged, slurry brought out of discharged liquid of the primary screening device and the fine screening device is repeatedly screened to improve the utilization rate, then the third-time discharged liquid is put into the fine screening device to be screened, it is guaranteed that the slurry obtained after re-screening meets the production requirement, a certain amount of primary slurry is saved, and the utilization rate of the slurry is increased.

Description

Technical Field

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

[0002] Pulp deslagging plays an extremely important role in the papermaking process. If impurities in the pulp are not removed, such as sand, dust, metal particles, etc., they will form spots or holes in the paper, affecting the appearance and quality of the paper. Through deslagging, these defects can be significantly reduced, making the paper surface smoother and more delicate, thereby improving the quality of the final product.

[0003] In the prior art, slag removal is often performed first through a pressure screen and then through a low-concentration slag remover to remove most of the impurities in the pulp. The pressure screen is mainly used to remove larger and heavier impurities, and the low-concentration slag remover is used to remove fine impurities with a density close to that of fibers. However, the slag discharged from the pressure screen and the low-concentration slag remover often carries a lot of good pulp, which will cause waste of good pulp. In the continuous papermaking production, the waste continues. Summary of the invention

[0004] The purpose of the present invention is to provide a pulp slag removal device and a slag removal method thereof in view of the above-mentioned technical problems, to add a re-screening device, to repeatedly screen the pulp brought out from the discharge of the primary screening device and the fine screening device to improve utilization, and then to put the three discharges into the fine screening device for screening to ensure that the pulp after re-screening meets production requirements, save a certain amount of original pulp, and improve the utilization rate of the pulp.

[0005] In view of this, the present invention provides a pulp deslagging device in this embodiment, comprising: a primary screening device, which screens out a primary discharge liquid containing large particles and heavy impurities from the pulp input inside, to obtain a primary slurry that has completed the primary screening; a fine screening device, which screens out a secondary discharge liquid containing fine impurities from the primary slurry that has completed the primary screening, to obtain a finished slurry that has completed the fine screening; a re-screening device, which re-screens the primary discharge liquid obtained by the primary screening device and the secondary discharge liquid obtained by the fine screening device to obtain a tertiary discharge liquid; wherein the tertiary discharge liquid is re-introduced into the fine screening device for fine screening, and the primary screening device, the fine screening device and the re-screening device can be connected by a pipeline, or transferred by using a receiving container to meet the transfer and input of the discharge liquid or slurry.

[0006] In the present technical scheme, a re-screening device is added, and through the linkage of the primary screening device, the fine screening device and the re-screening device, the re-screening device re-screens the primary discharge liquid obtained by the primary screening device and the secondary discharge liquid obtained by the fine screening device to obtain the tertiary discharge liquid, and the screened slurry and the tertiary discharge liquid are obtained. The tertiary discharge liquid is then re-put into the fine screening device for fine screening, and the slurry brought out from the discharge liquid of the primary screening device and the fine screening device is repeatedly screened to improve utilization, and the tertiary discharge liquid is then put into the fine screening device for screening to ensure that the slurry after re-screening meets the production requirements. The present device saves a certain amount of raw slurry in production and improves the utilization rate of slurry. Enterprises can achieve the dual benefits of maximizing resource utilization and environmental protection goals under the premise of ensuring product quality.

[0007] In the above technical scheme, further, the primary screening device includes a fixed seat, a primary screening tank body is arranged on the fixed seat, a primary screening roller is vertically arranged in the primary screening tank body, one end of the primary screening roller passes through the bottom wall of the primary screening tank body and is connected to a driving unit arranged in the fixed seat, the primary screening roller is coaxially fixedly connected with a rotating drum in the primary screening tank body, spiral blades are arranged on the side surface of the rotating drum, a screen drum with a screen gap is fixedly arranged in the primary screening tank body, and the screen drum and the primary screening roller are coaxially arranged.

[0008] In the above technical scheme, further, a mounting plate is horizontally arranged in the primary screening tank body, and the mounting plate is an annular plate with a first opening in the middle, and the side wall of the mounting plate is fixedly connected to the interior of the primary screening tank body, the upper side of the mounting plate is a screening bin, and the lower side is a buffer bin, and the top cover of the tank body is provided with an end cover opening downward, and a first cavity is provided in the end cover, and the first opening connects the screening bin and the buffer bin, and the radial dimension of the first opening is smaller than the radial dimension of the screen drum, the buffer bin is connected to a raw slurry input pipe, and the screening bin is connected to a primary slurry conveying pipe, and a second opening connecting the first chamber and the screening chamber is provided on the top of the tank body, the first chamber is connected to a top drainage pipe, and the buffer bin is connected to a bottom drainage pipe.

[0009] In the present technical solution, the driving unit can drive the primary screening roller to rotate. The driving unit is a prior art, such as a transmission wheel, a transmission belt and a transmission setting of a motor, so it will not be elaborated. The raw pulp enters the buffer bin through the raw pulp input pipe to precipitate heavy impurities. The heavy impurities are discharged from the bottom drainage pipe connected to the buffer bin. The raw pulp enters the screening bin upward through the first opening. The primary screening roller drives the rotating drum and the spiral blades on the rotating drum to rotate. The raw pulp is screened through the sieve slits set on the screen drum due to centrifugal force. The screened slurry is the primary slurry. The primary slurry is discharged from the primary slurry delivery pipe. The lighter impurities float up through the second opening into the first chamber and are discharged from the top drainage pipe. Such a setting can reduce the large amount of heavy impurities entering the screening bin, causing wear on the rotating drum, spiral blades and screen drum, or blocking the sieve slits on the screen drum, resulting in a decrease in screening efficiency.

[0010] In the above technical solution, further, a debris guide plate is provided in the buffer bin, one end of which is fixedly connected to the primary screening roller, and the other end of the debris guide plate is radially extended to a corresponding discharge port and is provided with an arc-shaped guiding structure, and the bottom of the debris guide plate abuts against the bottom of the primary screening tank body, and can drive the precipitated heavy impurities to leave the discharge port during rotation.

[0011] In this technical solution, the impurity guide plate and the primary screening roller are fixedly connected, and the other end is radially extended to the corresponding discharge port and is provided with an arc-shaped guide structure, which can rotate with the primary screening roller, driving the heavy impurities settled at the bottom of the primary screening tank to leave from the bottom drainage pipe, and timely discharge the heavy impurities to avoid excessive precipitation in the buffer zone, which will cause a decrease in the primary screening efficiency.

[0012] In the above technical solution, further, the re-screening device includes a support frame, an upper beam for installing the re-screening assembly is arranged on the top of the support frame, a workbench is arranged horizontally below the upper beam, a sieve liquid collecting table is arranged on the workbench, a re-screening container is arranged on the sieve liquid collecting table, and the re-screening assembly can re-screen the discharged liquid in the re-screening container downward.

[0013] In the above technical scheme, further, the re-screening assembly includes a mounting seat, the mounting seat and the upper beam are fixedly connected, a first hydraulic cylinder is arranged in the mounting seat, an extrusion plate is fixedly arranged at the output end of the first hydraulic cylinder, the inner cavity cross-section of the re-screening container matches the extrusion plate, a re-screening filter plate is embedded in the side wall of the re-screening container, the re-screening container is embedded with a filtration channel which can pass through the side wall, and the internal discharge of the re-screening container can be filtered out through the re-screening filter plate through the filtration channel.

[0014] In the above technical solution, further, the sieve liquid collection table includes a base arranged on the workbench, an interception plate is extended upwardly from the side of the base, a downward drainage pipe is connected to the base, and a collection bucket is arranged below the drainage pipe.

[0015] In the above technical solution, further, a clamping mechanism capable of clamping the re-screening container is provided on the support frame, one side of the bottom plate of the re-screening container and the side wall are hinged, and a locking structure is provided on the other side, and a slag discharge plate that can be opened downward is provided on the corresponding bottom plate of the screening liquid collection table.

[0016] In the above technical solution, further, one side of the slag discharge plate is hinged to the screen liquid collecting platform, and a first connecting block is fixedly arranged at the bottom away from the hinged end, the first connecting block is hinged to the second connecting block, the other end of the second connecting block is hinged to the driving block, the other end of the driving block is hinged to the output end of the second hydraulic cylinder, and the second hydraulic cylinder is hinged to the fixed block fixedly connected to the support frame.

[0017] In the present technical scheme, the locking structure can use the locking structure commonly used in the prior art, and the clamping mechanism, shown in the embodiment is two sets of hydraulic clamping devices arranged on the support frame, the hydraulic cylinder body and the support frame are fixedly connected, and the output end is connected to the clamping block that can be pressed against the re-screening container. In other embodiments, other common clamping mechanisms can also be used. When the first cylinder pushes the extrusion plate to squeeze and filter the drainage in the re-screening container, the filtrate is precipitated and the slag blocks remain inside. The bottom plate locking structure is opened, and the slag discharge plate is opened by the second hydraulic cylinder. The slag discharge plate no longer supports the bottom plate, and the first cylinder continues to push the slag blocks downward to complete the slag discharge.

[0018] Also included is a pulp deslagging method of the above pulp deslagging device, comprising the following steps:

[0019] S1: primary screening, the raw pulp is input into the primary screening device through the raw pulp input pipeline for screening, and a primary discharge liquid containing large particles and heavy impurities is obtained, as well as a primary pulp after the primary screening;

[0020] S2: fine screening, the primary slurry obtained by the primary screening device is passed into the fine screening device for screening to obtain the secondary discharge liquid containing fine impurities and the finished slurry after fine screening;

[0021] S3: Rescreening: the first and second drainage liquids are put into the rescreening device for screening to obtain the third drainage liquid.

[0022] S4: Circular fine screening, the drainage after screening by the re-screening device is passed into the fine screening device again for screening.

[0023] The beneficial effects of the present invention are:

[0024] 1. Add a re-screening device. Through the linkage of the primary screening device, the fine screening device and the re-screening device, the re-screening device re-screens the primary drainage obtained by the primary screening device and the secondary drainage obtained by the fine screening device to obtain the tertiary drainage to obtain the screened pulp and the tertiary drainage. The tertiary drainage is then put back into the fine screening device for fine screening. The pulp brought out from the drainage of the primary screening device and the fine screening device is repeatedly screened to improve utilization. The tertiary drainage is then put into the fine screening device for screening to ensure that the pulp after re-screening meets the production requirements. This device saves a certain amount of raw pulp in production and improves the utilization rate of pulp. Enterprises can achieve the dual benefits of maximizing resource utilization and environmental protection goals under the premise of ensuring product quality;

[0025] 2. The raw pulp enters the buffer bin through the raw pulp input pipe to precipitate heavy impurities, and the heavy impurities are discharged from the bottom drainage pipe connected to the buffer bin. The raw pulp enters the screening bin through the first opening, and the primary screening roller drives the rotating drum and the spiral blades on the rotating drum to rotate. The raw pulp is screened through the screen gaps set on the screen drum due to centrifugal force. The screened pulp is the primary slurry, which is discharged from the primary slurry conveying pipe, and the lighter impurities float up and enter the first chamber through the second opening and are discharged from the top drainage pipe. This arrangement can reduce the large amount of heavy impurities entering the screening bin, causing wear on the rotating drum, spiral blades and screen drum, or blocking the screen gaps on the screen drum, resulting in a decrease in screening efficiency.

[0026] 3. The impurity guide plate is fixedly connected to the primary screening roller, and the other end is radially extended to the corresponding discharge port and is provided with an arc-shaped guide structure, which can rotate with the primary screening roller, driving the heavy impurities settled at the bottom of the primary screening tank to leave from the bottom drainage pipe, and timely discharge the heavy impurities to avoid excessive precipitation in the buffer zone, which will cause a decrease in the primary screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a simplified view of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the primary screening device;

[0029] Figure 3 is a partial diagram of a primary screening device;

[0030] Figure 4 It is a structural schematic diagram of the re-screening device;

[0031] Figure 5 is a front view of the re-screening device;

[0032] Figure 6 is an internal view of the rescreening container;

[0033] Figure 7 It is a schematic structural diagram of the second embodiment.

[0034] The symbols in the figure are:

[0035] 1. Primary screening device; 2. Fine screening device; 3. Secondary screening device; 4. Fixed seat; 5. Primary screening tank; 6. Primary screening roller; 7. Rotating drum; 8. Spiral blade; 9. Screening drum; 10. Mounting plate; 11. First opening; 12. Screening bin; 13. Buffer bin; 14. End cover; 15. First cavity; 16. Primary slurry conveying pipe; 17. Raw slurry input pipe; 18. Second opening; 19. Top drainage pipe; 20. Bottom drainage pipe; 21. Trash guide plate; 22. Arc guide structure; 23. Support frame; 24. Upper beam; 25 , workbench; 26, sieve liquid collecting table; 27, re-screening container; 28, re-screening assembly; 29, mounting seat; 30, first hydraulic cylinder; 31, extrusion plate; 32, re-screening filter plate; 33, filtration channel; 34, first channel; 35, second channel; 36, base; 37, interception plate; 38, drainage tube; 39, collecting bucket; 40, clamping mechanism; 41, bottom plate; 42, locking structure; 43, slag discharge plate; 44, first connecting block; 45, second connecting block; 46, driving block; 47, second hydraulic cylinder; 48, fixing block. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] First embodiment:

[0042] like Figure 1-6As shown, this embodiment provides a pulp deslagging device, comprising: a primary screening device 1, the primary screening device 1 screens out a primary discharge liquid containing large particles and heavy impurities from the pulp input inside, and obtains a primary slurry that has completed the primary screening; a fine screening device 2, the fine screening device 2 screens out a secondary discharge liquid containing fine impurities from the primary slurry that has completed the primary screening, and obtains a finished slurry that has completed the fine screening; a re-screening device 3, the re-screening device 3 re-screens the primary discharge liquid obtained by the primary screening device 1 and the secondary discharge liquid obtained by the fine screening device 2 to obtain a tertiary discharge liquid; wherein the tertiary discharge liquid is re-introduced into the fine screening device 2 for fine screening, and the primary screening device 1, the fine screening device 2 and the re-screening device 3 can be connected by a pipeline, or transferred by a receiving container to meet the transfer and input of the discharge liquid or slurry.

[0043] A re-screening device 3 is added. Through the linkage of the primary screening device 1, the fine screening device 2 and the re-screening device 3, the re-screening device 3 re-screens the primary discharge liquid obtained by the primary screening device 1 and the secondary discharge liquid obtained by the fine screening device 2 to obtain the tertiary discharge liquid, and the screened slurry and the tertiary discharge liquid are obtained. The tertiary discharge liquid is then re-put into the fine screening device 2 for fine screening. The slurry brought out from the discharge liquid of the primary screening device 1 and the fine screening device 2 is repeatedly screened to improve utilization, and the tertiary discharge liquid is then put into the fine screening device 2 for screening to ensure that the slurry after re-screening meets the production requirements. This device saves a certain amount of raw slurry in production and improves the utilization rate of slurry. Enterprises can achieve the dual benefits of maximizing resource utilization and environmental protection goals under the premise of ensuring product quality.

[0044] The fine screening device 2 is a low-concentration slag remover, which can remove fine impurities with a density close to that of fibers. It is a prior art and will not be described in detail.

[0045] like Figure 2 As shown, the primary screening device 1 includes a fixed seat 4, on which a primary screening tank body 5 is arranged, a primary screening roller 6 is vertically rotatably arranged in the primary screening tank body 5, one end of the primary screening roller 6 passes through the bottom wall of the primary screening tank body 5 and is connected with a driving unit arranged in the fixed seat 4, the primary screening roller 6 is coaxially fixedly connected with a rotating drum 7 in the primary screening tank body 5, and a spiral blade 8 is arranged on the side surface of the rotating drum 7, a sieve drum 9 with a sieve gap is fixedly arranged in the primary screening tank body 5, and the sieve drum 9 and the primary screening roller 6 are coaxially arranged.

[0046] like Figure 2As shown, a mounting plate 10 is horizontally arranged in the primary screening tank body 5, and the mounting plate 10 is an annular plate with a first opening 11 in the middle. The side wall of the mounting plate 10 is fixedly connected to the interior of the primary screening tank body 5. The upper side of the mounting plate 10 is a screening bin 12, and the lower side is a buffer bin 13. The top cover of the tank body is provided with an end cover 14 opening downward, and a first cavity 15 is arranged in the end cover 14. The first opening 11 connects the screening bin 12 and the buffer bin 13. The radial dimension of the first opening 11 is smaller than the radial dimension of the screen drum 9. The buffer bin 13 is connected to a raw slurry input pipe 17, and the screening bin 12 is connected to a primary slurry conveying pipe 16. A second opening 18 connecting the first chamber and the screening chamber is arranged on the top of the tank body. The first chamber is connected to a top drainage pipe 19, and the buffer bin 13 is connected to a bottom drainage pipe 20.

[0047] The driving unit can drive the primary screening roller 6 to rotate. The driving unit is a prior art, such as a transmission wheel, a transmission belt, and a transmission setting of a motor, so it will not be elaborated. The raw pulp enters the buffer bin 13 through the raw pulp input pipe to precipitate heavy impurities. The heavy impurities are discharged from the bottom drainage pipe 20 connected to the buffer bin 13. The raw pulp enters the screening bin 12 upward through the first opening 11. The primary screening roller 6 drives the rotating drum 7 and the rotating spiral blade 8 to rotate. The raw pulp is screened through the sieve gap set on the screen drum 9 due to centrifugal force. The screened slurry is the primary slurry, which is discharged from the primary slurry conveying pipe 16. The lighter impurities float up through the second opening 18 into the first chamber and are discharged from the top drainage pipe 19. Such a setting can reduce the large amount of heavy impurities entering the screening bin 12, causing wear on the rotating drum 7, the spiral blade 8 and the screen drum 9, or blocking the sieve gap on the screen drum 9, resulting in a decrease in screening efficiency.

[0048] The primary drainage includes slurry with impurities of different specifications discharged from the top drainage pipe 19 and the bottom drainage pipe 20.

[0049] like Figure 2 and Figure 3 As shown, a debris guide plate 21 is provided in the buffer bin 13, one end of the debris guide plate 21 is fixedly connected to the primary screening roller 6, and the other end radially extends to a corresponding discharge port and is provided with an arc-shaped guiding structure 22. The bottom of the debris guide plate abuts against the bottom of the primary screening tank 5, and can drive the precipitated heavy impurities to leave the discharge port during rotation.

[0050] The impurity guide plate 21 is fixedly connected to the primary screening roller 6, and the other end is radially extended to the corresponding discharge port and is provided with an arc-shaped guide structure 22, which can rotate with the primary screening roller 6, and drive the heavy impurities settled at the bottom of the primary screening tank 5 to leave from the bottom drainage pipe 20, so as to discharge the heavy impurities in time to avoid excessive precipitation in the buffer zone and cause a decrease in the primary screening efficiency.

[0051] like Figure 4 and Figure 5As shown, the rescreening device 3 includes a support frame 23, an upper beam 24 for installing a rescreening assembly 28 is arranged on the top of the support frame 23, a workbench 25 is horizontally arranged below the upper beam 24, a sieve liquid collecting table 26 is arranged on the workbench 25, a rescreening container 27 is arranged on the sieve liquid collecting table 26, and the rescreening assembly 28 can rescreen the discharge liquid in the rescreening container 27 downward.

[0052] The re-screening assembly 28 includes a mounting seat 29, which is fixedly connected to the upper beam 24. A first hydraulic cylinder 30 is arranged in the mounting seat 29, and an extrusion plate 31 is fixedly arranged at the output end of the first hydraulic cylinder 30. The inner cavity cross-section of the re-screening container 27 matches the extrusion plate 31, and a re-screening filter plate 32 is embedded in the side wall of the re-screening container 27. The re-screening container 27 is embedded with a filtration channel 33 that can pass through the side wall. The internal discharge of the re-screening container 27 can be filtered out through the filtration channel 33 and the re-screening filter plate 32.

[0053] The filtration channel 33 includes a first channel 34 connecting the re-screening filter plate 32 and the accommodating chamber, and a second channel 35 connecting the re-screening plate and the outside. The re-screening filter plate 32 is a cylindrical structure, which can screen and retain impurities of the same specifications as those retained by the screen gaps on the screen drum 9, or smaller impurities. The filtered slurry is discharged three times and is again put into the fine screening device 2 for fine screening.

[0054] Second embodiment:

[0055] This embodiment provides a pulp slag removal device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0056] like Figure 7 As shown, the sieve liquid collection platform 26 includes a base 36 disposed on the workbench 25, and an interception plate 37 is extended upward from the side of the base 36. A downward drainage pipe 38 is connected to the base 36, and a collection bucket 39 is disposed below the drainage pipe 38.

[0057] The support frame 23 is provided with a clamping mechanism 40 capable of clamping the re-screening container 27. The bottom plate 41 of the re-screening container 27 is hinged to the side wall on one side, and a locking structure 42 is provided on the other side. The sieve liquid collection table 26 is provided with a slag discharge plate 43 that can be opened downward corresponding to the bottom plate 41.

[0058] like Figure 7 As shown, one side of the slag discharge plate 43 is hinged to the sieve liquid collecting platform 26, and a first connecting block 44 is fixedly provided at the bottom away from the hinged end. The first connecting block 44 is hinged to the second connecting block 45, and the other end of the second connecting block 45 is hinged to the driving block 46, and the other end of the driving block 46 is hinged to the output end of the second hydraulic cylinder 47, and the second hydraulic cylinder 47 is hinged to the fixed block 48 fixedly connected to the support frame 23.

[0059] The locking structure 42 can use the locking structure 42 commonly used in the prior art, and the clamping mechanism 40, shown in the embodiment is two sets of hydraulic clamping devices arranged on the support frame 23, the hydraulic cylinder body and the support frame 23 are fixedly connected, and the output end is connected to the clamping block that can abut against the re-screening container 27. In other embodiments, other common clamping mechanisms 40 can also be used. When the first cylinder pushes the extrusion plate 31 to squeeze and filter the drainage in the re-screening container 27, the filtrate is precipitated, and the slag blocks remain inside. The bottom plate 41 locking structure 42 is opened, and the slag discharge plate 43 is opened by the second hydraulic cylinder 47. The slag discharge plate 43 no longer supports the bottom plate 41, and the first cylinder continues to push the slag blocks downward to complete the slag discharge.

[0060] Also included is a pulp deslagging method of the above pulp deslagging device, comprising the following steps:

[0061] S1: primary screening, the raw pulp is input into the primary screening device 1 through the raw pulp input pipeline 17 for screening, and a primary discharge liquid containing large particles and heavy impurities is obtained, as well as a primary pulp after the primary screening;

[0062] S2: fine screening, the primary slurry obtained by the primary screening device 1 is passed into the fine screening device 2 for screening to obtain the secondary discharge liquid containing fine impurities and the finished slurry after fine screening;

[0063] S3: re-screening, the first drainage and the second drainage are put into the re-screening device 3 for screening to obtain the third drainage.

[0064] S4: Circular fine screening, the drainage after screening by the re-screening device 3 is passed into the fine screening device 2 again for screening.

[0065] 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 slag removal device, characterized in that: include: A primary screening device (1), wherein the primary screening device (1) screens the slurry fed into the device to remove the primary discharge liquid containing large particles and heavy impurities, thereby obtaining the primary slurry after the primary screening; A fine screening device (2), wherein the fine screening device (2) screens out secondary discharge liquid containing fine impurities from the primary slurry that has completed the initial screening, thereby obtaining a finely screened slurry; A re-screening device (3), the re-screening device (3) re-screens the primary discharge liquid obtained by the primary screening device (1) and the secondary discharge liquid obtained by the fine screening device (2) to obtain a tertiary discharge liquid; The tertiary drainage is re-introduced into the fine screening device (2) for fine screening. The primary screening device (1), the fine screening device (2) and the secondary screening device (3) can be connected via a pipeline or transferred using a receiving container to meet the transfer and input of drainage or slurry.

2. The pulp removing device according to claim 1, characterized in that: The primary screening device (1) comprises a fixed seat (4), a primary screening tank body (5) is arranged on the fixed seat (4), a primary screening roller (6) is arranged in the primary screening tank body (5) for vertical rotation, one end of the primary screening roller (6) passes through the bottom wall of the primary screening tank body (5) and is connected to a driving unit arranged in the fixed seat (4), the primary screening roller (6) is coaxially fixedly connected to a rotating drum (7) in the primary screening tank body (5), a spiral blade (8) is arranged on the side surface of the rotating drum (7), a screening drum (9) with screening slits is fixedly arranged in the primary screening tank body (5), and the screening drum (9) and the primary screening roller (6) are coaxially arranged.

3. The pulp removing device according to claim 2, characterized in that: A mounting plate (10) is horizontally arranged in the primary screening tank body (5), the mounting plate (10) is an annular plate with a first opening (11) arranged in the middle, the side wall of the mounting plate (10) is fixedly connected to the interior of the primary screening tank body (5), the upper side of the mounting plate (10) is a screening bin (12), the lower side is a buffer bin (13), the top cover of the tank body is provided with an end cover (14) with an opening facing downward, a first cavity (15) is arranged in the end cover (14), and the first opening (11) is connected to the screening bin (12). The first opening (11) of the selection bin (12) and the buffer bin (13) is smaller in radial dimension than the radial dimension of the screen drum (9), the buffer bin (13) is connected to a raw pulp input pipeline (17), the screening bin (12) is connected to a primary pulp delivery pipe (16), a second opening (18) connecting the first chamber and the screening chamber is provided at the top of the tank body, the first chamber is connected to a top drainage pipeline (19), and the buffer bin (13) is connected to a bottom drainage pipeline (20).

4. The pulp removing device according to claim 3, characterized in that: The buffer bin (13) is provided with a debris guide plate (21), one end of which is fixedly connected to the primary screening roller (6), and the other end of which is radially extended to correspond to the liquid discharge port and is provided with an arc-shaped guide structure (22). The bottom of the debris guide plate abuts against the bottom of the primary screening tank (5), and can drive the precipitated heavy impurities to leave from the liquid discharge port during rotation.

5. The pulp removing device according to claim 1, characterized in that: The rescreening device (3) comprises a support frame (23), an upper beam (24) for mounting a rescreening assembly (28) is arranged on the top of the support frame (23), a workbench (25) is arranged horizontally below the upper beam (24), a sieve liquid collecting table (26) is arranged on the workbench (25), a rescreening container (27) is arranged on the sieve liquid collecting table (26), and the rescreening assembly (28) can rescreen the discharge liquid in the rescreening container (27) downward.

6. The pulp removing device according to claim 5, characterized in that: The re-screening assembly (28) comprises a mounting seat (29), the mounting seat (29) and the upper beam (24) are fixedly connected, a first hydraulic cylinder (30) is arranged in the mounting seat (29), an extrusion plate (31) is fixedly arranged at the output end of the first hydraulic cylinder (30), the inner cavity cross-section of the re-screening container (27) matches the extrusion plate (31), a re-screening filter plate (32) is embedded in the side wall of the re-screening container (27), and a filtering channel (33) capable of penetrating the side wall is embedded in the re-screening container (27), and the internal discharge of the re-screening container (27) can be filtered out through the filtering channel (33) and the re-screening filter plate (32) outward.

7. The pulp removing device according to claim 5, characterized in that: The sieve liquid collecting platform (26) comprises a base (36) arranged on the workbench (25), an interception plate (37) extending upward from the side of the base (36), a downward drainage pipe (38) connected to the base (36), and a collection bucket (39) arranged below the drainage pipe (38).

8. The pulp removing device according to claim 5, characterized in that: The support frame (23) is provided with a clamping mechanism (40) capable of clamping the re-screening container (27); one side of the bottom plate (41) of the re-screening container (27) is hinged to the side wall, and the other side is provided with a locking structure (42); and the sieving liquid collection platform (26) is provided with a slag discharge plate (43) capable of opening downwards corresponding to the bottom plate (41).

9. The pulp deslagging device according to claim 8, characterized in that: One side of the slag discharge plate (43) is hinged to the sieve liquid collecting platform (26); a first connecting block (44) is fixedly arranged at the bottom of the side away from the hinged end; the first connecting block (44) is hinged to the second connecting block (45); the other end of the second connecting block (45) is hinged to the driving block (46); the other end of the driving block (46) is hinged to the output end of the second hydraulic cylinder (47); the second hydraulic cylinder (47) is hinged to the fixed block (48) fixedly connected to the support frame (23).

10. A pulp slag removal method based on the pulp slag removal device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: primary screening, inputting the raw pulp into the primary screening device (1) through the raw pulp input pipeline (17) for screening, obtaining a primary discharge liquid containing large particles and heavy impurities, and a primary pulp after the primary screening; S2: fine screening, passing the primary slurry obtained by the primary screening device (1) into the fine screening device (2) for screening, to obtain a secondary discharge containing fine impurities and a finished slurry after fine screening; S3: re-screening, the first discharge liquid and the second discharge liquid are put into the re-screening device (3) for screening to obtain the third discharge liquid, S4: Circular fine screening, the drainage liquid screened by the re-screening device (3) is passed into the fine screening device (2) again for screening.

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