Pulping device for recycling recycled waste paper

Abstract

The invention discloses a pulping device for recycling recycled waste paper. The pulping device comprises an outer pulping cylinder, an inner pulping cylinder and a stirrer, the first stirrer is arranged on the inner side of the pulping inner cylinder, the second stirrer is arranged at the lower end of the interior of the pulping outer cylinder, sieve plates are arranged below the first stirrer and the second stirrer, and the sieve plates divide the cavity into a first cavity and a second cavity from top to bottom; the rotating speed of the first stirrer is higher than that of the second stirrer. Double-groove staged treatment is adopted, the pulping efficiency is greatly improved, the upper layer adopts a high-shear-force sawtooth-shaped impeller, large waste paper is rapidly torn through strong turbulence generated by high-speed rotation and local high pressure, coarse crushing is completed within a short time, and the initial crushing period is shortened; the lower layer is provided with a low-shear paddle-shaped impeller, mild stirring is performed at a low speed, fine separation of fibers and residual impurities is focused, invalid circulation caused by repeated crushing of a single groove is avoided, the overall pulping speed is increased, the fibers are protected, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of waste paper pulping, and in particular relates to a pulping device for recycling waste paper. Background Art

[0002] Waste paper pulping is the process of turning waste paper into pulp through a series of processes such as shredding, deinking, and purification. On the one hand, it can effectively alleviate the pressure on the papermaking industry's demand for virgin wood pulp and reduce the amount of deforestation. On the other hand, waste paper pulping can significantly reduce energy consumption in the papermaking process. For example, compared with virgin wood pulp papermaking, it can reduce energy consumption by about 50%, while reducing wastewater and exhaust emissions and reducing pollution to the environment. Waste paper pulping realizes the recycling of resources, turning waste paper into "treasure", reducing the amount of landfill and incineration, and reducing the negative impact of garbage disposal on soil and air. It has promoted the development of the papermaking industry in a green and sustainable direction, and has positive significance for protecting the ecological environment and responding to climate change.

[0003] The hydraulic waste paper pulping machine decomposes waste paper through the synergistic effect of water and mechanical force. The high-speed rotating impeller generates vortexes, forming shear force and friction, tearing the waste paper into a fiber suspension. The water flow accelerates the fiber separation and separates impurities (such as plastic, sand and gravel) from the fibers. However, the degree of fragmentation of waste paper added at different times is different, resulting in a slow overall pulping speed. In addition, it may take longer to achieve uniform fragmentation, increasing energy consumption. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a pulping device for recycling waste paper, so as to at least partially solve the problems raised in the above background technology.

[0005] The technical solution adopted by the present invention is as follows: a pulping device for recycling waste paper is proposed, comprising: a pulping outer cylinder, the axis of which is arranged in a vertical direction and having a cavity with an open upper end; an agitator disposed in the cavity; A driver is provided at the bottom of the pulping outer cylinder and is used to drive the agitator to rotate; In which, a pulping inner cylinder is provided at the inner upper end of the pulping outer cylinder, and the agitator includes a first agitator and a second agitator. The first agitator is arranged on the inner side of the pulping inner cylinder, and the second agitator is arranged at the inner lower end of the pulping outer cylinder. Screen plates are provided below the first agitator and the second agitator. The screen plates separate the cavity from top to bottom to form a first cavity, a second cavity and a third cavity. The inner diameter of the first cavity is smaller than the inner diameter of the second cavity. The surface of the first agitator is provided with a serrated structure, and the surface of the second agitator is set to a smooth structure.

[0006] Further, the pulp-making inner cylinder comprises a first cylinder wall and a second cylinder wall, the first cylinder wall is located inside the second cylinder wall, and the first cylinder wall and the second cylinder wall are coaxially distributed, the second cylinder wall is clamped on the upper end of the inner wall of the pulp-making outer cylinder, the inside of the first cylinder wall forms a first cavity, and the fourth cavity is formed between the first cylinder wall and the second cylinder wall, and the height of the first cavity is the same as the height of the second cavity.

[0007] Further, a plurality of center-symmetrically distributed spoilers are fixedly arranged on the inner wall of the first cylinder wall, the cross section of the spoiler is triangular, trapezoidal or rectangular, the height of the spoiler is less than the height of the first cylinder wall, and the surface of the spoiler is provided with a toothed structure.

[0008] Further, the sieve plate comprises a first sieve plate and a second sieve plate, the first sieve plate is arranged below the first stirrer and is fixedly connected with the pulp-making inner cylinder, the lower end of the pulp-making outer cylinder is provided with a hopper, the second sieve plate is fixedly arranged on the inner side wall of the hopper and is located below the second stirrer, sieve holes are arranged on the first sieve plate and the second sieve plate, and the diameter of the sieve holes on the first sieve plate is greater than the diameter of the sieve holes on the second sieve plate.

[0009] Further, the second sieve plate is arranged on the middle section of the inner side wall of the hopper, a third cavity is arranged below the second sieve plate, the second cavity and the third cavity are communicated through the sieve holes on the second sieve plate, a pulp discharge pipe is arranged on the outer side wall of the hopper and corresponds to the upper portion of the second sieve plate, and an impurity discharge pipe is arranged on the outer side wall of the hopper and corresponds to the lower portion of the second sieve plate, the pulp discharge pipe is communicated with the second cavity, and the impurity discharge pipe is communicated with the third cavity.

[0010] Further, the output end of the driver is provided with a first driving shaft and a second driving shaft, the second driving shaft is coaxially arranged with the pulp-making outer cylinder, the second driving shaft is fixedly connected with the bottom of the second stirrer to drive the second stirrer to rotate inside the second cavity, the second driving shaft is arranged in a hollow pipe structure, the first driving shaft is located inside the second driving shaft, the first driving shaft penetrates through the second driving shaft and the second stirrer and is fixedly connected with the bottom of the first stirrer to drive the first stirrer to rotate inside the first cavity.

[0011] Further, the driver comprises two groups of motors, and the two groups of motors are respectively used for driving the first driving shaft and the second driving shaft to rotate.

[0012] Further, the stirrer comprises an impeller, the impeller comprises a plurality of center-symmetrically distributed blades, a paddle is fixedly arranged on each blade, and the paddle is vertically arranged on the end portion of the blade.

[0013] Furthermore, the agitator further comprises a rotor, which is fixedly arranged on the top of the impeller, and a spiral strip is fixedly provided on the outer wall of the rotor, and the spiral strip is spirally arranged on the outer wall of the rotor.

[0014] Furthermore, the edges of the spiral strips, impellers and paddles respectively include a serrated structure and a smooth structure. The edges of the spiral strips, impellers and paddles in the first cavity are set to a serrated structure, and the edges of the spiral strips, impellers and paddles in the second cavity are set to a smooth structure.

[0015] Beneficial effects: The present invention adopts double-trough staged processing to greatly improve the pulping efficiency, wherein the upper layer adopts a high-shear serrated impeller, which quickly tears large pieces of waste paper through the strong turbulence and local high pressure generated by high-speed rotation, completes coarse crushing in a short time, and shortens the initial crushing cycle; the lower layer is equipped with a low-shear paddle-shaped impeller, which gently stirs at a low speed, focuses on the fine separation of fibers and residual impurities, avoids the ineffective cycle caused by repeated crushing in a single tank, and improves the overall pulping speed; and the staged design prevents the fibers from being repeatedly sheared in a single tank body, which protects the fibers. In addition, the staged energy distribution enables the high-power upper impeller to run only for a short time, and the lower low-speed impeller to run for a long time in an energy-saving manner, thereby achieving an energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a pulping device for recycling waste paper proposed in an embodiment of the present invention; Figure 2 This is a front view schematic diagram of the structure of a pulping device for recycling waste paper proposed in an embodiment of the present invention; Figure 3 A schematic diagram of a half-section structure of a pulping device for recycling waste paper proposed in an embodiment of the present invention; Figure 4 A schematic diagram of the internal structure of a pulping device for recycling waste paper proposed in an embodiment of the present invention; Figure 5 The present invention provides a schematic diagram of the three-dimensional structure of an agitator according to an embodiment of the present invention.

[0017] Wherein, 10, pulping outer cylinder; 101, first cavity; 102, second cavity; 103, third cavity; 104, fourth cavity; 11, hopper; 111, pulp discharge pipe; 112, impurity discharge pipe; 12, support frame; 20, pulping inner cylinder; 201, first cylinder wall; 202, second cylinder wall; 21, spoiler; 30, agitator; 301, first agitator; 302, second agitator; 31, impeller; 311, paddle; 32, rotor; 321, spiral strip; 40, driver; 41, first drive shaft; 42, second drive shaft; 50, sieve plate; 500, sieve hole; 51, first sieve plate; 52, second sieve plate.

[0018] The accompanying drawings are used to provide a further understanding of the embodiments, and constitute a part of the specification, which are used to explain the embodiments together with the embodiments, and do not constitute a limitation on the embodiments. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection.

[0020] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments.

[0021] Since the barrel of the current water conservancy pulping machine has only one cavity inside, i.e. waste paper materials are broken and stirred to pulp in the cavity, due to the sequence of the input of waste paper materials, the first input waste paper materials are first crushed into pulp, and the subsequent waste paper is continuously input. In order to break the waste paper, the stirring speed of the agitator 30 needs to be maintained at a certain speed, and the broken debris needs to be separated out at a relatively slow speed. The high-speed rotation of the agitator 30 may cause excessive cutting of the fibers, resulting in a decrease in the physical strength (such as tensile strength) of the recycled paper, and multiple cycles of crushing will further damage the fibers and reduce the utilization rate of the recycled fibers. At the same time, the driving of the agitator 30 will consume a lot of energy. Therefore, the present embodiment provides a pulping device for recycling waste paper, which is used for step-by-step crushing and pulping of waste paper to protect the pulping fibers while reducing energy consumption. The device mainly comprises a pulping outer cylinder 10, a pulping inner cylinder 20, an agitator 30 and a driver 40.

[0022] like Figure 1 、 Figure 2 and Figure 3 As shown, the axis of the pulping outer cylinder 10 is set in the vertical direction and has a cavity with an open upper end. A support frame 12 is set at the bottom of the pulping outer cylinder 10. The support frame 12 is used to support the pulping outer cylinder 10 so that the pulping outer cylinder 10 remains stable during operation. The agitator 30 is set in the cavity, and the driver 40 is set at the bottom of the pulping outer cylinder 10 and is used to drive the agitator 30 to rotate. The pulping inner cylinder 20 is provided at the upper end of the interior of the pulping outer cylinder 10.

[0023] Further, such as Figure 3 and Figure 4 As shown, the pulping inner cylinder 20 includes an integrally formed first cylinder wall 201 and a second cylinder wall 202. The cross-section of the first cylinder wall 201 and the second cylinder wall 202 on one side is an inverted "J" shape. The first cylinder wall 201 is located on the inner side of the second cylinder wall 202, and the first cylinder wall 201 and the second cylinder wall 202 are coaxially distributed.

[0024] Among them, the second cylinder wall 202 is clamped on the upper end of the inner wall of the pulping outer cylinder 10, and a first cavity 101 is formed on the inner side of the first cylinder wall 201. A fourth cavity 104 is formed between the first cylinder wall 201 and the second cylinder wall 202. Insulation material can be arranged in the fourth cavity 104 to insulate the slurry in the pulping inner cylinder 20, so that the chemical additives in the slurry (such as deinking agent, decomposer) can achieve better effect.

[0025] Furthermore, the agitator 30 includes a first agitator 301 and a second agitator 302. The first agitator 301 is arranged on the inner side of the pulping inner cylinder 20, and the second agitator 302 is arranged at the lower end of the inner part of the pulping outer cylinder 10. A sieve plate 50 is provided below the first agitator 301 and the second agitator 302. The sieve plate 50 divides the cavity from top to bottom to form a first cavity 101, a second cavity 102 and a third cavity 103. The inner diameter of the first cavity 101 is smaller than the inner diameter of the second cavity 102, and the height of the first cavity 101 is the same as the height of the second cavity 102. The surface of the first agitator 301 is provided with a serrated structure, the surface of the second agitator 302 is set to a smooth structure, and the rotation speed of the first agitator 301 is greater than the rotation speed of the second agitator 302.

[0026] During operation, the first agitator 301 rotates at a relatively high speed in the first cavity 101, and the second agitator 302 rotates at a relatively low speed inside the second cavity 102. Waste paper materials are first placed in the first cavity 101. The high-speed rotating first agitator 301 breaks up the waste paper and mixes it with water to form pulp. The shredded pulp then passes through the upper screen plate 50 into the lower second cavity 102. The second agitator 302 rotates at a relatively low speed to continue to shred the pulp and separate the paper fibers. Finally, the pulp with shredded standards passes through the lower screen plate 50 into the third cavity 103 for discharge, completing the waste paper pulping process.

[0027] The waste paper raw material is quickly crushed by the high-speed first agitator 301 in the first cavity 101, and then the crushed paper scraps enter the second cavity 102 and are stirred into pulp by the low-speed second agitator 302. In this way, by setting up two cavities, the crushing and pulping of the waste paper material are distributed, which can achieve rapid crushing of paper and prevent excessive tearing during the separation of waste paper fibers. At the same time, the circulation time of the fibers in the cavity can be shortened, which protects the paper fibers and improves the utilization rate of the recycled fibers. The driver 40 independently controls the first agitator 301 and the second agitator 302, which can avoid the agitator 30 from running at high power for a long time, thereby achieving energy-saving effect.

[0028] like Figure 3 and Figure 4 As shown, a plurality of spoilers 21 are fixedly provided on the inner wall of the first cylinder wall 201 and are distributed in a centrally symmetrical manner. The cross-section of the spoiler 21 is triangular, trapezoidal, or rectangular. The height of the spoiler 21 is less than the height of the first cylinder wall 201, and the surface of the spoiler 21 is provided with a toothed structure. In this way, under the action of the first agitator 301 and the water force, the tearing force on the paper can be increased, the paper can be accelerated to be broken, and the shredding efficiency of the paper in the first cavity 101 is improved.

[0029] Furthermore, the sieve plate 50 includes a first sieve plate 51 and a second sieve plate 52. The first sieve plate 51 is arranged below the first agitator 301, and the first sieve plate 51 is fixedly connected to the pulping inner cylinder 20. The lower end of the pulping outer cylinder 10 is provided with a hopper 11. The second sieve plate 52 is fixed on the inner wall of the hopper 11 and is located on the lower side of the second agitator 302. The second sieve plate 52 is arranged in the middle section of the inner wall of the hopper 11. A third cavity 103 is provided below the second sieve plate 52. The second cavity 102 and the third cavity 103 are connected through the sieve hole 500 on the second sieve plate 52.

[0030] In some embodiments, the first sieve plate 51 and the second sieve plate 52 are both provided with sieve holes 500, and the sieve holes 500 on the first sieve plate 51 have a larger diameter than the sieve holes 500 on the second sieve plate 52. In this way, the first sieve plate 51 is used to sieve larger paper scraps, while the second sieve plate 52 is used to sieve the pulp for forming paper pulp. After the waste paper raw material is crushed to a certain degree in the first cavity 101, it can pass through the first sieve plate 51 into the second cavity 102 for low-speed crushing. While separating the paper fibers, the fibers are also protected. In the second cavity 102, after the paper fibers are completely separated to form pulp, the pulp can pass through the second sieve plate 52 into the third cavity 103 and be discharged and collected. The collected pulp can be used to make paper later.

[0031] In some embodiments, the outer side wall of the hopper 11 is provided with a pulp discharge pipe 111 corresponding to the upper side of the second sieve plate 52, and is provided with a foreign matter discharge pipe 112 corresponding to the lower side of the second sieve plate 52. The pulp discharge pipe 111 is in communication with the second cavity 102, and the foreign matter discharge pipe 112 is in communication with the third cavity 103.

[0032] In this way, the impurities such as adhesives (adhesive tape, label, and other sticky impurities) and microplastics that cannot be crushed in the second cavity 102 can be cleaned and discharged from the foreign matter discharge pipe 112, and the paper pulp in the third cavity 103 can be discharged from the pulp discharge pipe 111 for making paper.

[0033] As shown in Figure 3 and Figure 4 The output end of the driver 40 is provided with a first driving shaft 41 and a second driving shaft 42. The second driving shaft 42 is coaxially arranged with the pulp making outer cylinder 10 and is fixedly connected with the bottom of the second stirrer 302 to drive the second stirrer 302 to rotate inside the second cavity 102. The second driving shaft 42 is in a hollow pipe structure. The first driving shaft 41 is located inside the second driving shaft 42 and is fixedly connected with the bottom of the first stirrer 301 to drive the first stirrer 301 to rotate inside the first cavity 101.

[0034] In some embodiments, the driver 40 includes two sets of motors, and the two sets of motors are respectively used to drive the first driving shaft 41 and the second driving shaft 42 to rotate. Independent sensors can be arranged in the first cavity 101 and the second cavity 102, and the sensors are connected with the controller of the driver 40. The pulp concentration and the fiber length are monitored through the sensors, and the rotating speed of the stirrer 30 is dynamically adjusted. The first stirrer 301 in the first cavity 101 is operated at full speed in the initial stage, and the rotating speed is automatically reduced when the sensor detects that the pulp concentration in the first cavity 101 decreases. The rotating speed of the second stirrer 302 in the second cavity 102 is fine-tuned according to the fiber passing rate to avoid excessive stirring. In this way, compared with the traditional hydraulic pulper, the energy waste caused by the fixed rotating speed can be avoided, the energy supply can be realized on demand, and the energy saving effect can be achieved.

[0035] As shown in Figure 5 The stirrer 30 includes an impeller 31, and the impeller 31 includes a plurality of blades that are centrally symmetrically distributed. In this way, when the driver 40 drives the impeller 31 to rotate, the pulp is stirred to rotate by the plurality of impellers 31, the water drives the paper to be stirred in the cavity, the vortex is generated by the high-speed rotating impeller 31, the shearing force and the friction force are formed, and the waste paper is torn into a fiber suspension.

[0036] Further, in order to enhance the resistance between the impeller 31 and the water, a paddle 311 is fixedly arranged on each blade, and the paddle 311 is vertically arranged at the end of the blade. The paddle 311 can enhance the vortex effect generated by the impeller 31 and improve the shearing force.

[0037] In some embodiments, in order to improve the stirring capacity of the stirrer 30 on the pulp and the breaking effect on the paper, the stirrer 30 further includes a rotor 32, the rotor 32 is fixedly arranged at the top of the impeller 31, and a spiral strip 321 is fixedly arranged on the outer wall of the rotor 32. The spiral strip 321 is arranged in a spiral shape on the outer wall of the rotor 32, can drive the pulp to be stirred, and improves the stirring range.

[0038] In optional embodiments, the edges of the spiral strip 321, the impeller 31 and the paddle 311 respectively include sawtooth structures and smooth structures.

[0039] The edges of the spiral strips 321, impeller 31, and paddle 311 in the first cavity 101 are configured as serrated structures, while the edges of the spiral strips 321, impeller 31, and paddle 311 in the second cavity 102 are configured as smooth structures. The sharp edges and complex geometric shape of the serrated blades can generate local high-pressure areas and turbulence during high-speed rotation, resulting in stronger tearing and shearing effects on waste paper, accelerating the fragmentation of large pieces of waste paper. For unshredded waste paper (such as cardboard and book covers), the high shear force can quickly sever hydrogen bonds and adhesive bonds between fibers, shortening the coarse shredding time and effectively processing waste paper containing a large amount of coatings, films, or adhesives, reducing the number of cycles in the coarse shredding stage. The smooth curved surface design of the paddle-shaped blades with smooth edges reduces local shear strength, mainly using hydraulic scouring and supplemented by mechanical friction to reduce fiber cutting and fibrillation. Under low-speed stirring, the average fiber length can be increased by 15%-20% (compared to traditional single-trough bodies), significantly improving the tensile strength and burst resistance of recycled paper.

[0040] In combination with the above embodiments, compared with the traditional single-trough crushing pulping, the present invention adopts double-trough staged processing to greatly improve the pulping efficiency, wherein the upper layer adopts a high-shear serrated impeller, which quickly tears large pieces of waste paper through the strong turbulence and local high pressure generated by high-speed rotation, completes coarse crushing in a short time, and shortens the initial crushing cycle; the lower layer is equipped with a low-shear paddle-shaped impeller, which gently stirs at a low speed, focusing on the fine separation of fibers and residual impurities, avoiding the ineffective cycle caused by repeated crushing in a single trough, and improving the overall pulping speed. The staged design prevents the fibers from being repeatedly sheared in a single trough body, which protects the fibers. Finally, the staged energy distribution enables the high-power upper impeller to run only for a short time, and the lower low-speed impeller to run for a long time in an energy-saving manner, thereby achieving an energy-saving effect.

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0042] The above description of the embodiment is non-limiting. The drawings show only one embodiment, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the invention, designs a similar structure and embodiment without inventiveness, they shall fall within the scope of protection.

Claims

1. A pulping device for recycling waste paper, characterized in that: include: A pulping outer cylinder (10), the axis of which is arranged in a vertical direction and has a cavity with an open upper end; an agitator (30) disposed in the cavity; a driver (40) configured to drive the agitator (30) to rotate; The pulping outer cylinder (10) is provided with a pulping inner cylinder (20) at its upper inner end, and the agitator (30) includes a first agitator (301) and a second agitator (302), wherein the first agitator (301) is provided on the inner side of the pulping inner cylinder (20), and the second agitator (302) is provided at the lower inner end of the pulping outer cylinder (10), and a sieve plate (50) is provided below the first agitator (301) and the second agitator (302), and the sieve plate (50) separates the cavity from top to bottom to form a first cavity (101), a second cavity (102) and a third cavity (103), the inner diameter of the first cavity (101) is smaller than the inner diameter of the second cavity (102), the surface of the first agitator (301) is provided with a serrated structure, and the surface of the second agitator (302) is provided with a smooth structure.

2. The pulping device for recycling waste paper according to claim 1, characterized in that: The pulping inner cylinder (20) comprises an integrally formed first cylinder wall (201) and a second cylinder wall (202); the first cylinder wall (201) is located on the inner side of the second cylinder wall (202), and the first cylinder wall (201) and the second cylinder wall (202) are coaxially distributed; the second cylinder wall (202) is clamped on the upper end of the inner wall of the pulping outer cylinder (10); a first cavity (101) is formed on the inner side of the first cylinder wall (201); a fourth cavity (104) is formed between the first cylinder wall (201) and the second cylinder wall (202); and the height of the first cavity (101) is the same as that of the second cavity (102).

3. The pulping device for recycling waste paper according to claim 2, characterized in that: A plurality of spoilers (21) are fixedly provided on the inner wall of the first cylinder wall (201) and are distributed in a centrally symmetrical manner. The cross-section of the spoilers (21) is triangular, trapezoidal or rectangular. The height of the spoilers (21) is less than the height of the first cylinder wall (201), and the surface of the spoilers (21) is provided with a tooth-like structure.

4. The pulping device for recycling waste paper according to claim 1, characterized in that: The sieve plate (50) includes a first sieve plate (51) and a second sieve plate (52), wherein the first sieve plate (51) is arranged below the first agitator (301) and is fixedly connected to the pulping inner cylinder (20), a hopper (11) is provided at the lower end of the pulping outer cylinder (10), and the second sieve plate (52) is fixed on the inner side wall of the hopper (11) and is located below the second agitator (302), and sieve holes (500) are provided on both the first sieve plate (51) and the second sieve plate (52), and the aperture of the sieve holes (500) on the first sieve plate (51) is larger than the aperture of the sieve holes (500) on the second sieve plate (52).

5. The pulping device for recycling waste paper according to claim 4, characterized in that: The second sieve plate (52) is arranged at the middle section of the inner wall of the hopper (11); a third cavity (103) is provided below the second sieve plate (52); the second cavity (102) and the third cavity (103) are communicated through the sieve holes (500) on the second sieve plate (52); a slurry discharge pipe (111) is provided on the outer wall of the hopper (11) corresponding to the upper side of the second sieve plate (52); and a debris discharge pipe (112) is provided on the outer wall of the hopper (11) corresponding to the lower side of the second sieve plate (52); the slurry discharge pipe (111) is communicated with the second cavity (102), and the debris discharge pipe (112) is communicated with the third cavity (103).

6. The pulping device for recycling waste paper according to claim 1, characterized in that: The output end of the driver (40) is provided with a first drive shaft (41) and a second drive shaft (42), the second drive shaft (42) is coaxially arranged with the pulping outer cylinder (10), and the second drive shaft (42) is fixedly connected to the bottom of the second agitator (302) to drive the second agitator (302) to rotate inside the second cavity (102), the second drive shaft (42) is configured as a hollow tube structure, the first drive shaft (41) is located inside the second drive shaft (42), the first drive shaft (41) passes through the second drive shaft (42) and the second agitator (302) and is fixedly connected to the bottom of the first agitator (301) to drive the first agitator (301) to rotate inside the first cavity (101).

7. The pulping device for recycling waste paper according to claim 6, characterized in that: The driver (40) includes two sets of motors, and the two sets of motors are respectively used to drive the first drive shaft (41) and the second drive shaft (42) to rotate.

8. The pulping device for recycling waste paper according to claim 1, characterized in that: The stirrer (30) comprises an impeller (31), the impeller (31) comprising a plurality of blades distributed in a centrally symmetrical manner, each blade being fixedly provided with a paddle (311), the paddle (311) being erected at the end of the blade.

9. The pulping device for recycling waste paper according to claim 8, characterized in that: The stirrer (30) further comprises a rotor (32), wherein the rotor (32) is fixedly arranged on the top of the impeller (31), and a spiral strip (321) is fixedly provided on the outer wall of the rotor (32), and the spiral strip (321) is spirally arranged on the outer wall of the rotor (32).

10. The pulping device for recycling waste paper according to claim 9, characterized in that: The edges of the spiral strip (321), the impeller (31), and the paddle (311) respectively include a sawtooth structure and a smooth structure; the edges of the spiral strip (321), the impeller (31), and the paddle (311) in the first cavity (101) are configured as a sawtooth structure, and the edges of the spiral strip (321), the impeller (31), and the paddle (311) in the second cavity (102) are configured as a smooth structure.

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