A pulping apparatus for recycling waste paper

Abstract

A pulping apparatus for recycling waste paper includes an outer pulping cylinder, an inner pulping cylinder, and a stirrer. A first stirrer is located inside the inner pulping cylinder, and a second stirrer is located at the lower end of the inner pulping cylinder. Screen plates are installed below both the first and second stirrers, dividing the cavity from top to bottom to form a first cavity and a second cavity. The rotational speed of the first stirrer is greater than that of the second stirrer. This invention employs a dual-tank, staged processing method to significantly improve pulping efficiency. The upper layer uses a high-shear sawtooth impeller, which rapidly tears large pieces of waste paper through strong turbulence and localized high pressure generated by high-speed rotation, completing coarse shredding in a short time and shortening the initial shredding cycle. The lower layer is equipped with a low-shear paddle-shaped impeller, which gently stirs at low speed, focusing on fine separation of fibers and residual impurities. This avoids the ineffective cycle caused by repeated shredding in a single tank, improves the overall pulping speed, protects the fibers, and achieves energy savings.

Description

Technical Field

[0001] This invention belongs to the field of waste paper pulping technology, specifically referring to a pulping device for recycling waste paper. Background Technology

[0002] Waste paper pulping is the process of reprocessing 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 paper industry's demand for virgin wood pulp and reduce 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 also reducing wastewater and exhaust emissions, mitigating environmental pollution. Waste paper pulping realizes the recycling of resources, turning waste paper into "treasure," reducing landfill and incineration, reducing the negative impact of waste disposal on soil and air, and promoting the paper industry towards green and sustainable development. It has positive significance for protecting the ecological environment and addressing climate change.

[0003] Hydraulic waste paper pulping machines decompose waste paper through the combined action of hydraulic and mechanical forces. The high-speed rotating impeller generates vortices, forming shearing and frictional forces that tear the waste paper into a fiber suspension. The water flow accelerates fiber separation and separates impurities (such as plastics and sand) from the fibers. However, the degree of breakage varies depending on the amount of waste paper added at different times, resulting in a slow overall pulping speed. Moreover, to achieve uniform shredding, it may take longer, increasing energy consumption. Summary of the Invention

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

[0005] The technical solution adopted in this invention is as follows: A pulping device for recycling waste paper is proposed, comprising:

[0006] The pulping outer cylinder has its axis set in the vertical direction and has an open cavity at the top;

[0007] A stirrer is disposed within the cavity;

[0008] The driver is located at the bottom of the pulping outer cylinder and is used to drive the agitator to rotate;

[0009] The pulping outer cylinder has an inner pulping cylinder at its upper interior. The agitator includes a first agitator and a second agitator. The first agitator is located inside the inner pulping cylinder, and the second agitator is located at the lower interior of the outer pulping cylinder. A sieve plate is provided below both the first and second agitators. The sieve plate divides the cavity from top to bottom into 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 has a serrated structure, and the surface of the second agitator has a smooth structure.

[0010] Furthermore, the pulping inner cylinder includes an integrally formed 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 fitted onto the upper end of the inner wall of the pulping outer cylinder. A first cavity is formed inside the first cylinder wall. A fourth cavity is formed between the first cylinder wall and the second cylinder wall. The height of the first cavity is the same as the height of the second cavity.

[0011] Furthermore, a plurality of centrally symmetrically distributed baffles are fixedly provided on the inner wall of the first cylinder wall. The cross-sectional structure of the baffles is triangular, trapezoidal or rectangular. The height of the baffles is less than the height of the first cylinder wall, and the surface of the baffles is provided with a toothed structure.

[0012] Furthermore, the sieve plate includes a first sieve plate and a second sieve plate. The first sieve plate is disposed below the first agitator and is fixedly connected to the inner cylinder of the pulping process. The lower end of the outer cylinder of the pulping process is provided with a hopper. The second sieve plate is fixed on the inner side wall of the hopper and is located below the second agitator. Both the first sieve plate and the second sieve plate are provided with sieve holes, and the diameter of the sieve holes on the first sieve plate is larger than the diameter of the sieve holes on the second sieve plate.

[0013] Furthermore, the second screen plate is disposed in the middle section of the inner side wall of the hopper, and a third cavity is provided below the second screen plate. The second cavity and the third cavity are connected through the screen holes on the second screen plate. A waste discharge pipe is provided on the outer side wall of the hopper above the second screen plate, and a slurry discharge pipe is provided on the outer side wall of the hopper below the second screen plate. The waste discharge pipe is connected to the second cavity, and the slurry discharge pipe is connected to the third cavity.

[0014] Furthermore, the output end of the driver is provided with a first drive shaft and a second drive shaft. The second drive shaft is coaxially arranged with the pulping outer cylinder and is fixedly connected to the bottom of the second agitator to drive the second agitator to rotate inside the second cavity. The second drive shaft is configured as a hollow tube structure. The first drive shaft is located inside the second drive shaft. The first drive shaft passes through the second drive shaft and the second agitator and is fixedly connected to the bottom of the first agitator to drive the first agitator to rotate inside the first cavity.

[0015] Furthermore, the driver includes two sets of motors, which are used to drive the first drive shaft and the second drive shaft to rotate, respectively.

[0016] Furthermore, the agitator includes an impeller, which comprises a plurality of blades arranged in a centrally symmetrical manner, and each blade is fixedly provided with a baffle plate, which stands upright at the end of the blade.

[0017] Furthermore, the stirrer also includes a rotor, which is fixedly mounted on the top of the impeller, and a spiral strip is fixedly mounted on the outer wall of the rotor, the spiral strip being spirally arranged on the outer wall of the rotor.

[0018] Furthermore, the edges of the spiral strip, impeller, and deflector respectively include a serrated structure and a smooth structure. The edges of the spiral strip, impeller, and deflector in the first cavity are configured with a serrated structure, while the edges of the spiral strip, impeller, and deflector in the second cavity are configured with a smooth structure. Beneficial effects

[0019] This invention employs a dual-tank, staged processing method to significantly improve pulping efficiency. The upper layer utilizes a high-shear, serrated impeller, which rapidly tears large pieces of waste paper through strong turbulence and localized high pressure generated by high-speed rotation, completing coarse shredding in a short time and shortening the initial shredding cycle. The lower layer is equipped with a low-shear, paddle-shaped impeller, which gently stirs at low speed, focusing on fine separation of fibers and residual impurities, avoiding ineffective cycles caused by repeated shredding in a single tank, and improving the overall pulping speed. Furthermore, the staged design prevents fibers from being repeatedly sheared in a single tank, protecting the fibers. In addition, the staged energy distribution ensures that the high-power upper impeller only needs to operate for short periods, while the lower low-speed impeller operates energy-efficiently for extended periods, achieving energy-saving effects. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a pulping device for recycling waste paper according to an embodiment of the present invention;

[0021] Figure 2 This is a front view schematic diagram of a pulping apparatus for recycling waste paper according to an embodiment of the present invention;

[0022] Figure 3 This is a half-sectional schematic diagram of a pulping device for recycling waste paper according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of a pulping device for recycling waste paper according to an embodiment of the present invention.

[0024] Figure 5 A three-dimensional structural diagram of the stirrer is provided for an embodiment of the present invention.

[0025] Among them, 10 is the outer cylinder for pulping; 101 is the first cavity; 102 is the second cavity; 103 is the third cavity; 104 is the fourth cavity; 11 is the hopper; 111 is the discharge pipe; 112 is the waste discharge pipe; 12 is the support frame; 20 is the inner cylinder for pulping; 201 is the first cylinder wall; 202 is the second cylinder wall; 21 is the baffle plate; 30 is the agitator; 301 is the first agitator; 302 is the second agitator; 31 is the impeller; 311 is the baffle plate; 32 is the rotor; 321 is the spiral strip; 40 is the driver; 41 is the first drive shaft; 42 is the second drive shaft; 50 is the sieve plate; 500 is the sieve hole; 51 is the first sieve plate; 52 is the second sieve plate.

[0026] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0028] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and 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. Therefore, they should not be construed as limitations on the embodiments.

[0029] Since there is only one cavity inside the cylinder of the current water conservancy pulping machine, that is, the waste paper materials are intended to be broken and stirred into pulp in this cavity. Due to the sequential input of the waste paper materials, the waste paper materials input first are crushed into pulp first, and the subsequent formed waste paper is still being continuously input. In order to break the waste paper, the stirring speed of the stirrer 30 needs to be maintained at a certain rotational speed, while the crushed debris requires a relatively slow rotational speed to separate the fibers into pulp. Among them, maintaining a high-speed rotation of the stirrer 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 shredding will further damage the fibers and reduce the utilization rate of the recycled fibers. At the same time, the drive of the stirrer 30 also consumes more energy. Therefore, the embodiment of the present invention provides a pulping device for recycling waste paper, aiming to crush and pulp the waste paper step by step to protect the pulping fibers while reducing energy consumption. The device mainly includes a pulping outer cylinder 10, a pulping inner cylinder 20, a stirrer 30, and a driver 40.

[0030] As Figure 1 , Figure 2 and Figure 3 shown, the axis of the pulping outer cylinder 10 is set in the vertical direction and has an open cavity at the upper end. A support frame 12 is provided at the bottom of the pulping outer cylinder 10. The support frame 12 is used to support the pulping outer cylinder 10 to keep the pulping outer cylinder 10 stable during operation. The stirrer 30 is arranged in the cavity, and the driver 40 is arranged at the bottom of the pulping outer cylinder 10 and is used to drive the stirrer 30 to rotate. Among them, a pulping inner cylinder 20 is provided at the upper end inside the pulping outer cylinder 10.

[0031] Further, as Figure 3 and Figure 4 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 inside the second cylinder wall 202, and the first cylinder wall 201 and the second cylinder wall 202 are coaxially distributed.

[0032] Among them, 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 inside the first cylinder wall 201, and a fourth cavity 104 is formed between the first cylinder wall 201 and the second cylinder wall 202. Heat-insulating materials can be arranged in the fourth cavity 104 to keep the pulp in the pulping inner cylinder 20 warm, so that the chemical additives (such as deinking agents, decomposing agents) in the pulp achieve better effects.

[0033] Furthermore, the agitator 30 includes a first agitator 301 and a second agitator 302. The first agitator 301 is disposed inside the inner cylinder 20, and the second agitator 302 is disposed at the lower end of the inner cylinder 10. A sieve plate 50 is provided below both 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, and the surface of the second agitator 302 is provided with a smooth structure. The rotational speed of the first agitator 301 is greater than the rotational speed of the second agitator 302.

[0034] During operation, the first agitator 301 rotates at a relatively high speed in the first cavity 101, while the second agitator 302 rotates at a relatively low speed inside the second cavity 102. Waste paper material is first placed into the first cavity 101, where the high-speed rotating first agitator 301 breaks down the waste paper and mixes it with water to form pulp. The pulped material then passes through the upper screen plate 50 into the lower second cavity 102, where the second agitator 302 rotates at a relatively low speed to further break down the pulp and separate the paper fibers. Finally, the pulp that meets the pulping standard is discharged through the lower screen plate 50 into the third cavity 103, completing the waste paper pulping process.

[0035] In this process, waste paper raw materials are rapidly crushed by a high-speed first agitator 301 in the first cavity 101. The crushed paper scraps then enter the second cavity 102, where they are agitated into pulp by a low-speed second agitator 302. By setting up two cavities, the crushing and pulping of waste paper materials are distributed, which can achieve rapid paper crushing and prevent excessive tearing during the separation of waste paper fibers. At the same time, it can shorten the circulation time of fibers in the cavity, which can protect the paper fibers and improve the utilization rate of recycled fibers. Furthermore, 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 and achieve energy saving.

[0036] like Figure 3 and Figure 4 As shown, a plurality of centrally symmetrically distributed baffles 21 are fixed on the inner wall of the first cylinder wall 201. The cross-sectional structure of the baffles 21 is triangular, trapezoidal or rectangular. The height of the baffles 21 is less than the height of the first cylinder wall 201, and the surface of the baffles 21 is provided with a toothed structure. In this way, under the action of the first agitator 301 and water force, the tearing force of the paper can be increased, the paper can be broken up faster, and the paper fragmentation efficiency in the first cavity 101 can be improved.

[0037] Furthermore, the sieve plate 50 includes a first sieve plate 51 and a second sieve plate 52. The first sieve plate 51 is disposed below the first agitator 301 and is fixedly connected to the inner pulping cylinder 20. The lower end of the outer pulping 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 below the second agitator 302. The second sieve plate 52 is disposed 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 holes 500 on the second sieve plate 52.

[0038] In some embodiments, both the first sieve plate 51 and the second sieve plate 52 are provided with sieve holes 500, 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. Thus, the first sieve plate 51 is used to screen out larger paper scraps, while the second sieve plate 52 screens out pulp to form paper pulp. After the waste paper raw material is crushed to a certain extent 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, it can also protect the fibers. After the paper fibers are completely separated to form pulp in the second cavity 102, it can pass through the second sieve plate 52 into the third cavity 103 and be discharged and collected through the third cavity 103. Paper is then made from the recovered pulp.

[0039] In some embodiments, a waste discharge pipe 112 is provided on the outer side wall of the hopper 11 above the second screen plate 52, and a slurry discharge pipe 111 is provided on the outer side wall of the hopper 11 below the second screen plate 52. The waste discharge pipe 112 is connected to the second cavity 102, and the slurry discharge pipe 111 is connected to the third cavity 103.

[0040] Thus, impurities that cannot be broken down in the second cavity 102, such as adhesives (tape, labels, and other sticky impurities) and microplastics, can be cleaned and discharged after opening the impurity discharge pipe 112, and the pulp in the third cavity 103 can be discharged from the pulp discharge pipe 111 for continued paper production.

[0041] like Figure 3 and Figure 4 As shown, 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 is fixedly connected to the bottom of the second stirrer 302 to drive the second stirrer 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 stirrer 302 and is fixedly connected to the bottom of the first stirrer 301 to drive the first stirrer 301 to rotate inside the first cavity 101.

[0042] In some embodiments, the driver 40 includes two sets of motors, which are used to drive the first drive shaft 41 and the second drive shaft 42 to rotate, respectively. Independent sensors can be installed in the first cavity 101 and the second cavity 102, and the sensors are connected to the controller signal of the driver 40. The sensors monitor the pulp concentration and fiber length, and dynamically adjust the speed of the agitator 30. The first agitator 301 in the first cavity 101 runs at full speed in the initial stage. When the sensor detects a decrease in the pulp concentration in the first cavity 101, it automatically reduces the speed. The second agitator 302 in the second cavity 102 finely adjusts the speed according to the fiber throughput to avoid over-stirring. In this way, compared with the traditional hydraulic pulping machine, the energy waste caused by the fixed speed can be avoided, and energy can be supplied on demand to achieve energy saving effect.

[0043] like Figure 5 As shown, the agitator 30 includes an impeller 31, which includes multiple blades that are centrally symmetrically distributed. Thus, when the driver 40 drives the impeller 31 to rotate, the pulp is agitated by the multiple impellers 31, causing the water to drive the paper to be agitated in the cavity. The high-speed rotating impeller 31 generates eddies, forming shearing and frictional forces, which tear the waste paper into a fiber suspension.

[0044] Furthermore, in order to enhance the resistance between the impeller 31 and the water, a baffle plate 311 is fixed on each blade. The baffle plate 311 is erected at the end of the blade, which can enhance the vortex effect generated by the impeller 31 and increase the shear force.

[0045] In some embodiments, in order to improve the stirring ability of the agitator 30 to stir the slurry and the paper crushing effect, the agitator 30 further includes a rotor 32, which is fixedly disposed on the top of the impeller 31. A spiral strip 321 is fixedly disposed on the outer wall of the rotor 32. The spiral strip 321 is spirally disposed on the outer wall of the rotor 32, which can drive the slurry to stir and improve the stirring range.

[0046] In an optional embodiment, the edges of the spiral 321, impeller 31, and dial 311 include a serrated structure and a smooth structure, respectively.

[0047] In the first cavity 101, the edges of the spiral strip 321, impeller 31, and deflector 311 are set with a serrated structure, while the edges of the spiral strip 321, impeller 31, and deflector 311 in the second cavity 102 are set with a smooth structure. The sharp edges and complex geometry of the serrated blades can generate local high-pressure zones and turbulence during high-speed rotation, resulting in stronger tearing and shearing effects on waste paper and accelerating the breaking of large pieces of waste paper. For unbroken waste paper (such as cardboard and book covers), the high shear force can quickly cut the hydrogen bonds and adhesive bonds between fibers, shortening the coarse crushing time and effectively processing waste paper with a lot of coatings, films, or adhesives, reducing the number of cycles in the coarse crushing stage. The smooth curved surface design of the paddle-shaped blades with smooth edges reduces the local shear intensity. With water flushing as the main method and mechanical friction as the auxiliary method, fiber cutting and fiber brooming are reduced. Under low-speed stirring, the average fiber length can be increased by 15%-20% (compared to the traditional single-trough body), significantly improving the tensile strength and bursting strength of recycled paper.

[0048] In conjunction with the above embodiments, compared with traditional single-tank crushing and pulping, the dual-tank staged processing of this invention significantly improves pulping efficiency. The upper layer uses a high-shear sawtooth impeller, which quickly tears large pieces of waste paper through strong turbulence and local high pressure generated by high-speed rotation, completing coarse crushing in a short time and shortening the initial crushing cycle. The lower layer is equipped with a low-shear paddle-shaped impeller, which gently stirs at low speed, focusing on fine separation of fibers and residual impurities, avoiding the ineffective cycle caused by repeated crushing in a single tank, and improving the overall pulping speed. Furthermore, the staged design prevents fibers from being repeatedly sheared in a single tank, thus protecting the fibers. Finally, the staged energy distribution ensures that the high-power upper impeller only needs to operate for a short time, while the lower low-speed impeller operates in an energy-saving manner for a long time, achieving the effect of energy saving.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A pulping apparatus for recycling waste paper, characterized in that, include: The pulping outer cylinder (10) has its axis set in the vertical direction and has an open cavity at the top; A stirrer (30) is disposed inside the cavity; The driver (40) is configured to drive the stirrer (30) to rotate; The upper part of the pulping outer cylinder (10) is provided with a pulping inner cylinder (20). The agitator (30) includes a first agitator (301) and a second agitator (302). The first agitator (301) is located inside the pulping inner cylinder (20), and the second agitator (302) is located inside the lower 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). 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. The rotation speed of the first agitator (301) is greater than the rotation speed of the second agitator (302). The pulping inner cylinder (20) includes an integrally formed first cylinder wall (201) and a second cylinder wall (202). The first cylinder wall (201) is located inside the second cylinder wall (202), and the first cylinder wall (201) and the second cylinder wall (202) are coaxially distributed. The height of the first cavity (101) is the same as the height of the second cavity (102). The sieve plate (50) includes a first sieve plate (51) and a second sieve plate (52). The first sieve plate (51) is disposed below the first stirrer (301), and the second sieve plate (52) is located on the lower side of the second stirrer (302). The first sieve plate (51) and the second sieve plate (52) are both provided with sieve holes (500). The diameter of the sieve hole (500) on the first sieve plate (51) is larger than the diameter of the sieve hole (500) on the second sieve plate (52). The first screen 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 screen plate (52) is fixed on the inner side wall of the hopper (11). The second screen plate (52) is located in the middle section of the inner side wall of the hopper (11). A third cavity (103) is provided below the second screen plate (52). The second cavity (102) and the third cavity (103) are connected through the screen holes (500) on the second screen plate (52). A waste discharge pipe (112) is provided on the outer side wall of the hopper (11) above the second screen plate (52). A slurry discharge pipe (111) is provided on the outer side wall of the hopper (11) below the second screen plate (52). The waste discharge pipe (112) is connected to the second cavity (102). The slurry discharge pipe (111) is connected to the third cavity (103). In the first cavity (101), the first agitator (301) breaks up waste paper and mixes it with water to form pulp. The first sieve plate (51) is used to screen out larger paper scraps. The shredded pulp enters the second cavity (102) below through the first sieve plate (51). In the second cavity (102), the second agitator (302) rotates to continue shredding the pulp. The second sieve plate (52) screens out the pulp that forms the pulp. After the paper fibers are completely separated to form pulp, it enters the third cavity (103) through the second sieve plate (52) to obtain shredded pulp of standard size.

2. The pulping apparatus for recycling waste paper according to claim 1, characterized in that: The second cylinder wall (202) is fitted onto 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), and a fourth cavity (104) is formed between the first cylinder wall (201) and the second cylinder wall (202).

3. The pulping apparatus for recycling waste paper according to claim 2, characterized in that: Multiple centrally symmetrically distributed baffles (21) are fixed on the inner wall of the first cylindrical wall (201). The cross-sectional structure of the baffles (21) is triangular, trapezoidal or rectangular. The height of the baffles (21) is less than the height of the first cylindrical wall (201), and the surface of the baffles (21) is provided with a toothed structure.

4. The pulping apparatus 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 stirrer (302) to drive the second stirrer (302) to rotate inside the second cavity (102). The second drive shaft (42) is set 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 stirrer (302) and is fixedly connected to the bottom of the first stirrer (301) to drive the first stirrer (301) to rotate inside the first cavity (101).

5. The pulping apparatus for recycling waste paper according to claim 4, characterized in that: The driver (40) includes two sets of motors, and the two sets of motors are used to drive the first drive shaft (41) and the second drive shaft (42) to rotate respectively.

6. The pulping apparatus for recycling waste paper according to claim 1, characterized in that: The stirrer (30) includes an impeller (31), which includes a plurality of blades that are centrally symmetrically distributed. Each blade is fixedly provided with a baffle (311), which is erected at the end of the blade.

7. The pulping apparatus for recycling waste paper according to claim 6, characterized in that: The stirrer (30) also includes a rotor (32), which is fixedly disposed on the top of the impeller (31). A spiral strip (321) is fixedly disposed on the outer wall of the rotor (32), and the spiral strip (321) is spirally disposed on the outer wall of the rotor (32).

8. The pulping apparatus for recycling waste paper according to claim 7, characterized in that: The edges of the spiral strip (321), impeller (31) and dial plate (311) respectively include a serrated structure and a smooth structure. The edges of the spiral strip (321), impeller (31) and dial plate (311) in the first cavity (101) are set with a serrated structure, and the edges of the spiral strip (321), impeller (31) and dial plate (311) in the second cavity (102) are set with a smooth structure.

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