Double bar screen drum and pressure screen using the same

Abstract

The present application discloses a double-bar screen drum and a pressure screen using the same. The method includes: determining the pressure value for pressing the pulp into the cleaning chamber; according to the pressure value, pressing the pulp into the cleaning chamber and injecting water into the cleaning chamber; rotating the rotor device in the cleaning chamber, and under the action of the rotor device and water, separating impurities in the pulp and enabling the pulp to uniformly pass through the screen drum fixedly arranged in the cleaning chamber. In the present application, after the pulp is stirred evenly by the rotor device, the impurities in the pulp can be separated by the pressure in the cleaning chamber and the buoyancy of water, and under the pressure of the rotor device, the pulp uniformly passes through the screen drum, thereby improving the quality of the fine pulp after screening.

Description

Technical Field

[0001] The present application relates to the field of pressure screens, and in particular to a double-bar screen drum and a pressure screen using the same. Background Art

[0002] With the continuous improvement of the quality requirements for paper products in the paper-making industry, higher requirements are also put forward for the quality of pulp, and higher requirements are also placed on the pressure screens and screen drums for manufacturing pulp.

[0003] The pressure screen can screen the pulp in combination with the screen drum, remove impurities in the pulp, and control the uniformity of the pulp concentration, making the pulp screened by the pressure screen purer and the concentration more uniform, thereby improving the quality of the pulp. However, at present, the screen slots of the screen drum have been reduced to 0.10 - 0.15 mm. The rotors in the original pressure screens are usually short rotors, and there are intervals between the rotors. At the intervals of the rotors, only the pressure of the pulp itself can be used to press the pulp towards the screen drum, making the bars in the screen drum prone to deformation, having a short service life, low machining accuracy, and reducing the quality of the good pulp after screening. Summary of the Invention

[0004] The main purpose of the present application is to provide a double-bar screen drum and a pressure screen method, device, equipment, and storage medium using the same, aiming to solve the technical problems in the prior art that the bars in the screen drum are prone to deformation, have a short service life, low machining accuracy, and reduce the quality of the good pulp after screening.

[0005] To achieve the above object, the present application provides a double-bar screen drum and a pressure screen using the same, including a housing, and a cleaning chamber for cleaning the pulp is formed inside the housing, including:

[0006] A rotor device, the rotor device includes a rotor and a long rotor blade. The long rotor blade is set such that the thickness of one side is greater than a preset thickness, and the thickness of the other side is less than the preset thickness. The rotor device is rotatably arranged on the inner wall of the cleaning chamber, and the long rotor blade is fixedly arranged on the outer wall of the rotor;

[0007] A screen drum, the screen drum is fixedly arranged in the cleaning chamber, and the screen drum cooperates with the long rotor blade for removing impurities and screening the pulp;

[0008] A power unit, the power unit is fixedly connected to the rotor device for driving the rotor device to drive the rotor device to rotate.

[0009] Optionally, a plurality of long rotor blades are provided, and the plurality of long rotor blades are uniformly arranged annularly around the rotor.

[0010] Optionally, the long rotor is configured such that the thickness on one side is greater than a preset thickness, and the thickness on the other side is less than the preset thickness. The side of the long rotor along the rotation direction of the rotor is the side with a thickness greater than the preset thickness, and the side of the long rotor along the opposite direction of the rotor rotation is the side with a thickness less than the preset thickness.

[0011] Optionally, the long rotor is inclined on the outer wall of the rotor and is configured to generate negative pressure on the side with a thickness less than the preset thickness of the long rotor, so as to suck the impurities or slurry stuck on the sieve drum back into the cleaning chamber.

[0012] Optionally, the rotor and the sieve drum are coaxially arranged, and there is a gap between the long rotor and the inner wall of the sieve drum.

[0013] The present application further provides a double-bar sieve drum and a method for a pressure screen using the same. The double-bar sieve drum and the method for a pressure screen using the same include:

[0014] Determine the pressure value for pressing the slurry into the cleaning chamber;

[0015] According to the pressure value, press the slurry into the cleaning chamber and inject water into the cleaning chamber;

[0016] Rotate the rotor device in the cleaning chamber. Under the action of the rotor device and water, separate the impurities in the slurry and make the slurry uniformly pass through the sieve drum fixedly arranged in the cleaning chamber.

[0017] Optionally, the step of rotating the rotor device in the cleaning chamber, separating the impurities in the slurry under the action of the rotor device and water, and making the slurry uniformly pass through the sieve drum fixedly arranged in the cleaning chamber includes:

[0018] Start the rotor device to rotate the long rotor arranged on the rotor device;

[0019] Through the rotation of the long rotor, stir the slurry to separate the slurry and the impurities;

[0020] And through the rotation of the long rotor, press the slurry towards the sieve drum to make the slurry uniformly pass through the sieve drum.

[0021] Optionally, the step of stirring the slurry through the rotation of the long rotor to separate the slurry and the impurities includes:

[0022] Among them, the impurities are divided into floating impurities and sink water impurities;

[0023] Through the rotation of the long rotor, stir the slurry to separate the floating impurities and the sink water impurities in the slurry;

[0024] The floating impurities are buoyed by the water and float on the upper layer of the slurry; the submerged impurities sink to the bottom of the water to separate the slurry from the impurities.

[0025] Optionally, the step of pressing the slurry against the sieve drum by the rotation of the long rotor to make the slurry uniformly pass through the sieve drum includes:

[0026] Among them, the bars in the sieve drum are wedge-shaped bars, and every two adjacent bars are spliced together integrally through protrusions and depressions, and a gap is formed between every two bars, and the gap is a sieve slot;

[0027] By the rotation of the long rotor, the slurry is pressed against the sieve drum to make the slurry uniformly pass through the sieve slots.

[0028] Optionally, the double-bar sieve drum and the method of the pressure sieve using the same further include:

[0029] When the slurry passes through the sieve drum, in combination with the rotation of the long rotor, a negative pressure is generated at the long rotor;

[0030] The negative pressure sucks the slurry stuck on the sieve drum back into the cleaning cavity.

[0031] The present application provides a double-bar sieve drum and a pressure sieve using the same. Compared with the prior art, the pressure sieve cannot be perfectly combined with the sieve drum, resulting in the slurry not passing through the sieve drum evenly, and the accuracy of the slurry screening concentration by the pressure sieve is low. In the present application, the pressure value for pressing the slurry into the cleaning cavity is determined; according to the pressure value, the slurry is pressed into the cleaning cavity and water is injected into the cleaning cavity; the rotor device in the cleaning cavity is rotated, and under the action of the rotor device and water, the impurities in the slurry are separated, and the slurry uniformly passes through the sieve drum fixedly arranged in the cleaning cavity. In the present application, through the set pressure, the slurry is pressed into the cleaning cavity and a pressure is generated in the cleaning cavity. After the rotor device stirs the slurry, the impurities and the slurry are separated by the buoyancy of water and the pressure in the cleaning cavity, and a uniform pressure is applied to the slurry by the rotor device to make the slurry uniformly pass through the sieve drum. That is, in the present application, after the slurry is stirred evenly by the rotor device, the impurities in the slurry can be separated by the pressure in the cleaning cavity and the buoyancy of water, and under the pressure of the rotor device, the slurry uniformly passes through the sieve drum, thereby improving the quality of the good pulp after screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0034] Figure 1 Structural schematic diagram of the first embodiment of the double-bar screen drum of the present application and the pressure screen using the same;

[0035] Figure 2 For Figure 1 Structural schematic diagram of the rotor device 200 in

[0036] Figure 3 Flow schematic diagram of the second embodiment of the method of the double-bar screen drum of the present application and the pressure screen using the same.

[0037] Explanation of the reference numerals in the drawings:

[0038] Label Name Label Name 10 Housing 11 Rotor 12 Long Rotor Blade 13 Power Unit 14 Sieve Drum 15 Cleaning Chamber 21 Thin Side 22 Thick Side 100 Pressure Screen 200 Rotor Assembly

[0039] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0042] In the present application, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0043] In addition, in the present application, descriptions such as "first" and "second" are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other. However, it is based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0044] The present application provides a double-bar screen drum and a pressure screen using the same, namely, the pressure screen 100. Refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of the first embodiment of the double-bar screen drum and the pressure screen using the same in the present application; Figure 2 is Figure 1 a schematic structural diagram of the rotor device 200 in

[0045] In the embodiments of the present application, the pressure screen 100:

[0046] Refer to Figure 1 , the device includes a housing 10, and a cleaning chamber 15 for cleaning the slurry is formed inside the housing, including:

[0047] A rotor device 200, the rotor device includes a rotor 11 and a long rotor blade 12. The long rotor blade 12 is set such that the thickness of one side is greater than a preset thickness and the thickness of the other side is less than the preset thickness. The rotor device 200 is rotatably provided on the inner wall of the cleaning chamber 15, and the long rotor blade 12 is fixedly provided on the outer wall of the rotor 11;

[0048] A screen drum 14, the screen drum 14 is fixedly provided in the cleaning chamber 15, and the screen drum 14 cooperates with the long rotor blade 12 for removing impurities and screening the slurry;

[0049] A power unit 13, the power unit is fixedly connected to the rotor device 200 for driving the rotor device 200 to drive the rotor device 200 to rotate.

[0050] In the technical solution of the present application, the long rotor blade 12 is set such that the thickness on one side is greater than a preset thickness and the thickness on the other side is less than the preset thickness. The rotor device 200 is rotatably arranged on the inner wall of the cleaning chamber 15, and the long rotor blade 12 is fixedly arranged on the outer wall of the rotor 11. There will be no splicing gaps in the long rotor blade 12, and the slurry can be evenly pressed against the screen drum 14, preventing the slurry from passing through the screen drum 14 evenly, resulting in a low accuracy of the pressure screen 100 in screening the slurry concentration.

[0051] In an embodiment of the present application, the length of the long rotor blade 12 is consistent with the length of the rotor 11. With this setting, there is no need to splice multiple short rotor blades to form the length of the rotor, and there will be no splicing gaps in the long rotor blade 11. When the rotor 11 drives the long rotor blade 12 to rotate, it can cover the entire inner wall of the screen drum 14, and the slurry can pass through the screen drum 14 evenly.

[0052] Refer to Figure 2 , a plurality of long rotor blades 12 are provided, and the plurality of long rotor blades 12 are evenly arranged annularly around the rotor 11.

[0053] In an embodiment of the present application, the plurality of long rotor blades 12 can make the slurry rotate continuously, completely stir the slurry. With this setting, the fibers and impurities in the slurry can be completely separated, and the impurities in the slurry can be completely removed to obtain pure slurry.

[0054] Refer to Figure 2 , the long rotor blade 12 is set such that the thickness on one side is greater than a preset thickness and the thickness on the other side is less than the preset thickness. The side of the long rotor blade along the rotation direction of the rotor is the side with a thickness greater than the preset thickness, and the side of the long rotor blade along the reverse direction of the rotor rotation is the side with a thickness less than the preset thickness.

[0055] In an embodiment of the present application, taking the rotation direction of the rotor 11 as the positive direction, one side of the long rotor blade 12 in the long direction is set as the side with a thickness greater than the preset thickness, that is, the thick side 22, and the other side of the long rotor blade 12 in the reverse direction is set as the side with a thickness less than the preset thickness, that is, the thin side 21. The thick side 22 and the thin side 21 are smoothly curved. With this setting, the thick side 22 can rub and crush the particles in the slurry against the inner wall of the screen drum 14, preventing the slurry particles from sinking and being discharged together with the heavy impurities.

[0056] Refer to Figure 1 and Figure 2 , the long rotor blade 12 is inclined on the outer wall of the rotor 11 to generate a negative pressure on the side of the long rotor blade 11 with a thickness less than the preset thickness, sucking the impurities or slurry stuck on the screen drum 14 back into the cleaning chamber.

[0057] In an embodiment of the present application, when the thick side 22 rubs and crushes the particles in the slurry against the inner wall of the sieve drum 14, it is easy to get the slurry stuck in the sieve slots of the sieve drum 14. The thin side 21 of the long rotor blade 12 during rotation can generate negative pressure to suck the slurry stuck in the sieve slots of the sieve drum 14 back into the cleaning chamber 15, avoiding the blockage of the sieve slots of the sieve drum 14.

[0058] In an embodiment of the present application, since the thick side 22 easily gets impurities stuck in the sieve slots of the sieve drum 14, through the obliquely arranged long rotor blade 12, pressure can be exerted on the impurities against the bars of the obliquely arranged sieve drum 14, avoiding the vertical pressure on the bars of the sieve drum 14, reducing the force on the bars of the sieve drum 14, increasing the service life of the bars of the sieve drum 14, and avoiding the enlargement of the sieve slots of the sieve drum 14 caused by the deformation of the bars of the sieve drum 14, thereby making the slurry passing through the sieve drum 14 more uniform.

[0059] Refer to Figure 1 , the rotor 11 and the sieve drum 14 are coaxially arranged, and there is a gap between the long rotor blade 12 and the inner wall of the sieve drum 14.

[0060] In an embodiment of the present application, the gap between the long rotor blade 12 and the inner wall of the sieve drum 14 can be set according to the user's needs. The coaxial arrangement of the rotor 11 and the sieve drum 14 can make the gap between the long rotor blade 12 and the sieve drum 14 uniform, enabling the entire sieve drum 14 to screen the slurry, improving the efficiency of slurry screening.

[0061] The present application embodiment provides a double-bar sieve drum and a method for a pressure screen using the same. In the second embodiment of the double-bar sieve drum and the method for a pressure screen using the same in the present application, refer to Figure 3 , the double-bar sieve drum and the method for a pressure screen using the same include:

[0062] Step S10, determining the pressure value for pressing the slurry into the cleaning chamber;

[0063] Step S20, pressing the slurry into the cleaning chamber according to the pressure value and injecting water into the cleaning chamber;

[0064] Step S30, rotating the rotor device in the cleaning chamber, separating the impurities in the slurry under the action of the rotor device and water, and enabling the slurry to uniformly pass through the sieve drum fixedly arranged in the cleaning chamber.

[0065] The specific steps are as follows:

[0066] Step S10, determining the pressure value for pressing the slurry into the cleaning chamber;

[0067] In this embodiment, it should be noted that the double-bar screen drum and the method of the pressure screen using the same can be applied to the double-bar screen drum and the pressure screen using the same, that is, the pressure screen. The double-bar screen drum and the pressure screen using the same can be applied to the production line system for pulp screening.

[0068] It should be noted that the pulp needs to be pressed into the cleaning chamber through the pressure equipment on the production line.

[0069] Among them, the range of the pressure value can be but is not limited to 0.15 MPa to 0.3 MPa.

[0070] Among them, "MPa" is the unit of pressure, that is, megapascal.

[0071] Among them, the pulp is not limited to pulp, and can also be other fiber pulps.

[0072] In the embodiment, determine the pressure value of the pressure equipment that needs to press the pulp into the cleaning chamber to ensure that the pulp can be smoothly pressed into the cleaning chamber and generate pressure in the cleaning chamber. In this embodiment, it should be noted that the setting of the pressure value is determined according to the pressure value required in the cleaning chamber.

[0073] Step S20, according to the pressure value, press the pulp into the cleaning chamber and inject water into the cleaning chamber;

[0074] Among them, the amount of water injected into the cleaning chamber is determined according to the concentration of the required pulp and the current concentration of the pulp.

[0075] Among them, the water injected into the cleaning chamber can make the pulp float.

[0076] In this embodiment, according to the pressure value, the pulp is pressed into the cleaning chamber, and according to the current concentration of the pulp and the concentration of the required pulp, a certain amount of water is injected into the cleaning chamber to make the pulp float and separate the impurities in the current pulp from the pulp.

[0077] Step S30, rotate the rotor device in the cleaning chamber, and under the action of the rotor device and water, separate the impurities in the pulp and make the pulp uniformly pass through the screen drum fixedly arranged in the cleaning chamber.

[0078] Among them, the rotor device rotates driven by the power unit 13.

[0079] Among them, the power unit 13 can include a power source and a transmission mechanism.

[0080] Among them, the power source can be but is not limited to motors, hydraulic motors, pneumatic motors, etc.

[0081] Among them, the transmission mechanism can be but is not limited to chains, gears, belts, etc.

[0082] It should be noted that the power source can be combined with the transmission mechanism at will. That is, the motor can be combined with a chain, a gear, or a belt; the hydraulic motor can be combined with a chain, a gear, or a belt; the starting motor can be combined with a chain, a gear, or a belt.

[0083] It should be noted that the transmission mechanism can also be composed of a combination of a chain and a gear, a combination of a chain and a belt, a combination of a gear and a belt, or a combination of a chain, a gear, and a belt.

[0084] Among them, the impurities can include floating impurities and submerged impurities.

[0085] Among them, the bars of the sieve drum are connected by concave-convex joints, and a gap is naturally formed between every two bars, that is, the gap is the sieve slot.

[0086] In this embodiment, the rotor device is driven to rotate by the power unit 13. Under the rotation of the rotor device, the slurry is stirred by the field-length rotor blades, and under the buoyancy of water, the fibers in the slurry are fully dispersed, the slurry and the impurities are completely separated, the floating impurities float on the water surface, and the submerged impurities sink to the bottom.

[0087] In this embodiment, the slurry is pressed against the sieve drum by the long rotor blades, so that the slurry evenly and smoothly passes through the sieve slots of the sieve drum, and finally pure slurry with uniform concentration is obtained.

[0088] Specifically, the step of separating the slurry and the impurities by stirring the slurry through the rotation of the long rotor blades includes:

[0089] Step C1, stirring the slurry through the rotation of the long rotor blades to separate the floating impurities and the submerged impurities in the slurry;

[0090] Step C2, the floating impurities are buoyed by the water and float on the upper layer of the slurry; the submerged impurities sink to the bottom, so as to separate the slurry and the impurities.

[0091] In this embodiment, since there is a gap between the rotors of the long rotor blades, under the rotation of the long rotor blades, the slurry can rotate and flow sufficiently, completely separating the impurities attached to the slurry from the slurry, separating the floating impurities and the submerged impurities in the slurry, and under the action of the buoyancy of water, floating the floating impurities on the water surface and sinking the submerged impurities to the bottom.

[0092] Specifically, the step of pressing the slurry against the sieve drum through the rotation of the long rotor blades to make the slurry evenly pass through the sieve drum includes:

[0093] Among them, the bars in the sieve drum are wedge-shaped bars, and every two adjacent bars are joined together by concave-convex joints. A gap is formed between every two bars, and the gap is a sieve slit.

[0094] Step D1: By rotating the long rotor blades, press the slurry towards the sieve drum so that the slurry uniformly passes through the sieve slits.

[0095] In this embodiment, since the sizes of the sieve slits between the bars in the sieve drum are uniform and the bars are connected by concave-convex joints, when the slurry is pressed towards the sieve drum by the long rotor blades, each bar can be evenly stressed, so that the concentration of the slurry passing through the sieve slits is consistent, avoiding excessive pressure on one bar, causing deformation of the bar and increasing the sieve slit.

[0096] The present application provides a double-bar sieve drum and a pressure screen using the same. Compared with the prior art in which the pressure screen cannot be perfectly combined with the sieve drum, resulting in the slurry not passing through the sieve drum evenly and the low accuracy of the concentration of the slurry screened by the pressure screen. In the present application, the pressure value for pressing the slurry into the cleaning chamber is determined; according to the pressure value, the slurry is pressed into the cleaning chamber and water is injected into the cleaning chamber; the rotor device in the cleaning chamber is rotated, and under the action of the rotor device and water, the impurities in the slurry are separated, and the slurry uniformly passes through the sieve drum fixedly arranged in the cleaning chamber. In the present application, through the set pressure, the slurry is pressed into the cleaning chamber and pressure is generated in the cleaning chamber. After the rotor device stirs the slurry, the impurities and the slurry are separated by the buoyancy of water and the pressure in the cleaning chamber, and a uniform pressure is applied to the slurry by the rotor device, so that the slurry uniformly passes through the sieve drum. That is to say, in the present application, after the slurry is stirred evenly by the rotor device, the impurities in the slurry can be separated by the pressure in the cleaning chamber and the buoyancy of water, and under the pressure of the rotor device, the slurry uniformly passes through the sieve drum, thereby improving the quality of the refined pulp after screening.

[0097] Further, based on the first embodiment of the present application, another embodiment of the present application is provided. In this embodiment, the method for the double-bar sieve drum and the pressure screen using the same further includes:

[0098] Step E1: When the slurry passes through the sieve drum, in combination with rotating the long rotor blades, a negative pressure is generated at the long rotor blades.

[0099] Step E2: The negative pressure sucks the slurry stuck on the sieve drum back into the cleaning chamber.

[0100] In this embodiment, the long rotor is inclined, and one side of the long rotor along the rotation direction is thick and the other side is thin, which can prevent the slurry from accumulating at the long rotor, reduce the amount of slurry passing through the sieve drum, and the inclined long rotor can also scrape off the slurry or impurities stuck on the sieve drum obliquely; when the long rotor rotates, a negative pressure can be generated on the thin side of the long rotor to suck out the slurry or impurities stuck in the sieve slots of the sieve drum, avoid clogging of the sieve drum, and improve the slurry output rate.

[0101] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A pressure screen using a double-bar sieve drum, comprising a housing, wherein a cleaning chamber for cleaning the pulp is formed inside the housing, and it is characterized in that, Comprising: A rotor device, the rotor device includes a rotor and a long rotor blade. The long rotor blade has a thickness greater than a preset thickness on one side and a thickness less than the preset thickness on the other side. The side of the long rotor blade along the rotation direction of the rotor is the thick side with a thickness greater than the preset thickness, and the side of the long rotor blade along the opposite direction of the rotor rotation is the thin side with a thickness less than the preset thickness. The rotor device is rotatably arranged on the inner wall of the cleaning chamber, and the long rotor blade is fixedly arranged on the outer wall of the rotor; A sieve drum, the sieve drum is fixedly arranged in the cleaning chamber, the sieve drum cooperates with the long rotor blade. The length of the long rotor blade conforms to the length of the rotor. When the rotor drives the long rotor blade to rotate, it can cover the entire inner wall of the sieve drum, and evenly pass the slurry through the sieve drum for impurity removal and screening of the slurry; Wherein, the rotor and the sieve drum are coaxially arranged, and there is a gap between the long rotor blade and the inner wall of the sieve drum, and the gap between the long rotor blade and the sieve drum is uniform. The thick side and the thin side are smoothly curved, so that the thick side frictions and crushes the particles in the slurry against the inner wall of the sieve drum. The thin side of the rotating long rotor blade can generate negative pressure to suck back the slurry stuck on the sieve slots of the sieve drum into the cleaning chamber; A power unit, the power unit is fixedly connected to the rotor device for driving the rotor device to drive the rotor device to rotate.

2. The pressure screen using a double-bar sieve drum according to claim 1, characterized in that, There are multiple long rotor blades, and the multiple long rotor blades are evenly arranged annularly around the rotor.

3. The pressure screen using a double-bar sieve drum as claimed in claim 2, wherein The long rotor blade is inclined on the outer wall of the rotor.

4. A method of using a pressure screen according to any one of claims 1-3, characterized in that, The method of the pressure sieve includes: Determine the pressure value for pressing the slurry into the cleaning chamber; According to the pressure value, press the slurry into the cleaning chamber and inject water into the cleaning chamber; Rotate the rotor device in the cleaning chamber. Under the action of the rotor device and water, separate the impurities in the slurry and make the slurry evenly pass through the sieve drum fixedly arranged in the cleaning chamber.

5. The method of the pressure screen according to claim 4, characterized in that, The step of rotating the rotor device in the cleaning chamber, separating the impurities in the slurry under the action of the rotor device and water, and making the slurry evenly pass through the sieve drum fixedly arranged in the cleaning chamber includes: Start the rotor device to rotate the long rotor blade arranged on the rotor device; Through the rotation of the long rotor blade, stir the slurry to separate the slurry and the impurities; And through the rotation of the long rotor blade, press the slurry towards the sieve drum to make the slurry evenly pass through the sieve drum.

6. The method of the pressure screen according to claim 5, characterized in that, The step of separating the slurry and the impurities by stirring the slurry through the rotation of the long rotor blade, Includes: Wherein, the impurities are divided into floating impurities and sinking impurities; Through the rotation of the long rotor blade, stir the slurry to separate the floating impurities and the sinking impurities in the slurry; The floating impurities are buoyed by the water and float on the upper layer of the slurry; the sinking impurities sink to the bottom to separate the slurry and the impurities.

7. The method of the pressure screen according to claim 5, characterized in that The step of pressing the slurry towards the sieve drum through the rotation of the long rotor blade to make the slurry evenly pass through the sieve drum, Includes: Among them, the bars in the sieve drum are wedge-shaped bars, and every two adjacent bars are joined together by concave-convex joints. A gap is formed between every two bars, and the gap is a sieve slot. Through the rotation of the long rotor blades, the pulp is pressed towards the sieve drum, so that the pulp uniformly passes through the sieve slots.

8. The method of the pressure screen according to claim 5, characterized in that, The method of the pressure screen also includes: When the pulp passes through the sieve drum, by combining with the rotation of the long rotor blades, a negative pressure is generated at the long rotor blades. The negative pressure sucks the pulp stuck on the sieve drum back into the cleaning chamber.

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