Papermaking waste grinding method and papermaking waste grinding equipment

Abstract

The invention discloses a papermaking waste material grinding method and papermaking waste material grinding equipment with the papermaking waste material grinding method.The papermaking waste material grinding method comprises the steps of pretreatment, two ball running-in and shaping, skipping of fine sorting, direct treatment of complex impurities, cost reduction and high-value utilization of waste plastics. And incineration pollution and resource waste are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste paper recycling and processing, and particularly relates to a method for grinding paper-making waste and a paper-making waste grinding device. Background Art

[0003] The utility model patent with the application number CN202020364756.5 discloses a solid waste recycling and processing device, including a grinding box, a feed inlet and a support mechanism, and further includes a lifting mechanism and a grinding mechanism; the feed inlet is opened at the top of the grinding box, the support mechanism is installed in the middle of the inner bottom wall of the grinding box, the lifting mechanism is installed outside the grinding box, and the grinding mechanism is installed in the middle of the lifting mechanism and connected to the top of the support mechanism; the lifting mechanism includes a sleeve, a through pipe, a lifting rod, a slider, a first bearing, a connecting rod, a connecting block, a lifting motor, a turntable, a second bearing and a cross bar. In this utility model, by setting the lifting mechanism, the lifting mechanism can drive the grinding motor and the grinding disc of the grinding mechanism to move up and down through the up and down movement of the cross bar, so that this device can conveniently crush the garbage evenly. In this technical solution, the waste materials are concentrated and poured into the grinding mechanism for grinding. A large number of waste materials with different sizes are urgently ground inside the grinding mechanism and need to be ground repeatedly to ensure sufficient crushing, resulting in low efficiency. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a paper-making waste grinding device, which can realize the high-value utilization of waste plastics.

[0006] The present invention also proposes a paper-making waste grinding device for the above-mentioned paper-making waste grinding method.

[0007] According to the paper-making waste grinding method of the first aspect embodiment of the present invention, it includes the following steps: Step 1: Pretreatment, extruding the moisture in the waste, separating the iron materials and the sediment in the waste; Step 2: First ball milling, feeding the material into the first grinding tank, using the first grinding head to cooperate with the first grinding tank to grind the waste, and the ground waste enters the grinding chamber through the first sieve holes; Step 3: Second ball milling, the waste enters the second grinding tank from the screw cylinder, using the second grinding head to cooperate with the second grinding tank to grind the waste, and further finely grinding it into powder; Step 4: Shaping, injecting the waste into a shaping mold, and processing the waste into a shape through an injection molding machine; Wherein, in Step 2 and Step 3, when the waste enters the first grinding tank or the second grinding tank, 3% - 12% of the extrusion conversion agent is added synchronously.

[0008] The papermaking waste grinding method according to the embodiments of the present invention has at least the following beneficial effects: skipping fine sorting, directly processing complex impurities, reducing costs, realizing high-value utilization of waste plastics, and reducing incineration pollution and resource waste.

[0009] According to some embodiments of the present invention, step 1 includes the following sub-steps: Step 1.1: Iron removal. The waste is conveyed to the pneumatic conveying mechanism by a magnetic separation conveyor, and the magnetic roller in the magnetic separation conveyor adsorbs miscellaneous iron. Step 1.2: Removal of sediment and stone particles. The waste is conveyed into the screw extruder by the pneumatic conveying mechanism. Step 1.3: Squeezing dry. The waste is conveyed into the first grinding tank by the screw extruder.

[0010] The papermaking waste grinding equipment according to the embodiments of the second aspect of the present invention is used for the papermaking waste grinding method of the first aspect of the present invention, and includes: A grinding cylinder with a grinding chamber built therein. A first grinding tank is provided at the upper end of the grinding cylinder. A plurality of first sieve holes are provided on the bottom surface of the first grinding tank. A second grinding tank is provided at the lower end of the grinding chamber. A plurality of second sieve holes are provided in the second grinding tank, and the aperture of the second sieve holes is smaller than that of the first sieve holes. A first grinding head movably built in the first grinding tank, and there is a first grinding gap between the end face of the first grinding head and the bottom surface of the first grinding tank. A second grinding head movably built in the second grinding tank, and there is a second grinding gap between the end face of the second grinding head and the bottom surface of the second grinding tank. A shaping device communicated with the lower end of the grinding cylinder. A shaping die is built in the shaping device, and the shaping device is used to heat and shape the waste coming from the grinding chamber. Wherein, the surfaces of the first grinding head and the second grinding head are both provided with pit grooves for grinding.

[0011] The papermaking waste grinding equipment according to the embodiments of the present invention has at least the following beneficial effects: skipping fine sorting, directly processing complex impurities, reducing costs, realizing high-value utilization of waste plastics, and reducing incineration pollution and resource waste.

[0012] According to some embodiments of the present invention, a hopper is provided at the upper end of the grinding cylinder, a screw extruder is provided above the hopper, and the hopper is located below the discharge end of the screw extruder.

[0013] According to some embodiments of the present invention, from the top end of the grinding cylinder, a rotating shaft is disposed through the grinding cylinder, and the end of the rotating shaft extends into the bottom of the grinding cavity. Both the first grinding head and the second grinding head are fixed on the rotating shaft, so that the first grinding head can pivot around a fixed axis in the first grinding groove, and the second grinding head can pivot around a fixed axis in the second grinding groove. Wherein, the hopper is fixedly connected with a connecting plate, and the end of the rotating shaft is pivotally connected to the connecting plate.

[0014] According to some embodiments of the present invention, in a vertical cross-section, the end faces of the first grinding head, the second grinding head, the first grinding groove and the second grinding groove are all arc-shaped; wherein, the central axis of the first grinding head coincides with the central axis of the first grinding groove, and the end face diameter of the first grinding head is smaller than the bottom diameter of the first grinding groove, so that the width of the first grinding gap gradually increases from the middle to both sides; the central axis of the second grinding head coincides with the central axis of the second grinding groove, and the end face diameter of the second grinding head is smaller than the bottom diameter of the second grinding groove, so that the width of the second grinding gap gradually increases from the middle to both sides.

[0015] According to some embodiments of the present invention, a driving motor is disposed at the upper end of the rotating shaft, and the driving motor is used to drive the rotating shaft to pivot. Wherein, the connecting plate is provided with a motor seat, and the driving motor is fixedly connected to the motor seat.

[0016] According to some embodiments of the present invention, a plurality of stirring rods are disposed on the side wall of the rotating shaft, and the plurality of stirring rods are spaced apart in the circumferential direction of the rotating shaft, and the stirring rods are located in the grinding cavity.

[0017] According to some embodiments of the present invention, the part of the rotating shaft disposed inside the grinding cavity includes two grinding sections and a dispersing section. The dispersing section is provided with a plurality of the stirring rods, and the dispersing section is disposed between the two grinding sections. Wherein, the grinding section is provided with grinding protrusions, and the grinding protrusions are spirally wound around the rotating shaft. In a vertical cross-section, a third grinding gap is formed between the grinding protrusions and the inner side wall of the grinding cavity.

[0018] According to some embodiments of the present invention, the pits are spirally covered on the end faces of the first grinding head and the second grinding head.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, where: Figure 1 It is a schematic diagram of the papermaking waste grinding method according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the papermaking waste grinding equipment according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the grinding cylinder according to an embodiment of the present invention.

[0022] 100. Grinding cylinder; 110. First grinding groove; 111. First sieve hole; 120. Second grinding groove; 121. Second sieve hole; 130. Grinding cavity; 200. First grinding head; 300. Second grinding head; 400. Pit; 500. Rotating shaft; 510. Driving motor; 520. Grinding section; 530. Dispersing section; 600. Stirring rod; 610. Sleeve; 700. Grinding protrusion; 800. Hopper; 810. Connecting plate; 820. Motor base; 900. Shaping equipment; Detailed implementation manners

[0023] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0024] In the description of the present invention, it should be understood that for the orientation description, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0025] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as "setting", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0027] Referring to Figure 1 , the papermaking waste grinding method according to the first aspect embodiment of the present invention includes the following steps: Step 1: Pretreatment, extruding the moisture in the waste, separating the iron material in the waste, and the sediment in the waste; Step 2: First ball milling, feeding the material into the first grinding tank 110, using the first grinding head 200 to cooperate with the first grinding tank 110 to grind the waste, and the ground waste enters the grinding chamber 130 through the first sieve hole 111; Step 3: Second ball milling, the waste enters the second grinding tank 120 from the screw cylinder, using the second grinding head 300 to cooperate with the second grinding tank 120 to grind the waste, and further finely grinding it into powder; Step 4: Shaping, injecting the waste into the shaping mold, and processing the waste into a shape through an injection molding machine; Wherein, in Step 2 and Step 3, when the waste enters the first grinding tank 110 or the second grinding tank 120, 3% - 12% of the extrusion conversion agent is added synchronously.

[0028] The following elaborates on the above multiple steps one by one, where: In Step 1, impurities such as iron material and sediment in the waste are effectively removed, reducing the wear of the equipment by impurities during the subsequent grinding process, reducing the moisture content to make the waste easier to grind, and providing good material conditions for the subsequent grinding process.

[0029] In Step 2, the squeezed waste enters the first grinding tank 110 from the hopper 800. The drive motor 510 drives the rotating shaft 500 to rotate. The first grinding head 200 fixed on the rotating shaft 500 pivots around the fixed axis in the first grinding tank 110. The spiral pit 400 on the end face of the first grinding head 200 cooperates with the arc-shaped bottom surface of the first grinding tank 110 to grind the waste; during the grinding process, 3% - 12% of the extrusion conversion agent is added synchronously to the first grinding tank 110. The ground waste falls into the grinding chamber 130 through the first sieve hole 111. The waste is preliminarily ground, so that larger waste particles are ground. The added extrusion conversion agent helps to improve the grinding performance of the waste, improve the grinding efficiency, and the preliminarily ground waste enters the grinding chamber 130 to prepare for the subsequent second ball milling.

[0030] In step 3, the waste in the grinding chamber 130 enters the second grinding groove 120 through the screw cylinder. The rotating shaft 500 drives the second grinding head 300 to rotate in the second grinding groove 120. The spiral pits 400 on the end face of the second grinding head 300 cooperate with the arc-shaped bottom surface of the second grinding groove 120 to further grind the waste. Similarly, when the waste enters the second grinding groove 120, 3% - 12% of the extrusion conversion agent is added. Since the aperture of the second sieve hole 121 is smaller than that of the first sieve hole 111, the finer powder after the second grinding passes through the second sieve hole 121 and is finally finely ground into powder.

[0031] In step 4, the finely ground powdered waste enters the shaping device 900 from the grinding chamber 130. The shaping mold built in the shaping device 900 is preheated to a suitable temperature. The injection molding machine injects the powdered waste into the shaping mold. Under certain pressure and temperature, the waste melts and fills the mold cavity. After cooling and solidifying, it is processed into the required shaped product. The ground powdered waste is transformed into a shaped product with specific shape and properties, realizing the high-value utilization of waste plastics and completing the entire process of waste treatment and reuse.

[0032] In summary, by skipping the fine sorting and directly treating complex impurities, the cost is reduced, the high-value utilization of waste plastics is achieved, and the incineration pollution and resource waste are reduced.

[0033] Furthermore, step 1 includes the following sub-steps: Step 1.1: Iron removal. The waste is conveyed to the pneumatic conveying mechanism by the magnetic separation conveyor, and the magnetic roller in the magnetic separation conveyor adsorbs the miscellaneous iron. Step 1.2: Removal of sediment and stone particles. The waste is conveyed to the screw extruder by the pneumatic conveying mechanism. Step 1.3: Squeezing dry. The waste is conveyed to the first grinding groove 110 by the screw extruder.

[0034] The following details each of the above-mentioned sub-steps one by one, where: In step 1.1, when the magnetic separation conveyor is running, the waste moves with the conveying device. The magnetic field generated by the magnetic roller exerts an attractive force on the ferromagnetic substances in the waste, adsorbing the miscellaneous iron on the surface of the magnetic roller. As the magnetic roller rotates, the miscellaneous iron is carried to the non-magnetic area and falls off, thus realizing the separation of the miscellaneous iron from the waste. The separated waste is conveyed to the pneumatic conveying mechanism. The miscellaneous iron in the waste is efficiently separated, preventing the iron material from entering the subsequent grinding equipment and avoiding wear and damage to components such as the grinding head and grinding groove, ensuring the normal operation of the equipment.

[0035] In step 1.2, the pneumatic conveying mechanism generates a high-speed air flow to blow up and convey the waste after iron removal. During the conveying process, due to the relatively large density of sediment and stone particles, their movement speeds and trajectories in the air flow are different from those of the waste, and part of the sediment and stone particles will be separated under the action of gravity and air flow. Subsequently, the waste is conveyed to the screw extruder and continues to move forward under the push of the screw. Further remove impurities with relatively large densities such as sediment and stone particles in the waste, reduce the influence of impurities on subsequent grinding and shaping processes, and improve the purity of the material.

[0036] In step 1.3, the screw of the screw extruder rotates to extrude the incoming waste. The pitch of the screw gradually becomes smaller, and the inner diameter of the barrel gradually decreases, forming an extrusion space. During the extrusion process of the waste, moisture is extruded, and the dried waste is conveyed to the first grinding groove 110 through the discharge port of the screw extruder. Effectively reduce the moisture content in the waste, make the waste present a relatively dry state, facilitate grinding in the first grinding groove 110, and improve the grinding efficiency and effect.

[0037] In some embodiments, referring to Figure 2 and Figure 3 , the paper waste grinding equipment for implementing the paper waste grinding method in the first aspect embodiment of the present invention includes a grinding cylinder 100, a first grinding head 200, a second grinding head 300, and a shaping device 900. The grinding cylinder 100 is internally provided with a grinding chamber 130. The upper end of the grinding cylinder 100 is provided with a first grinding groove 110. The bottom surface of the first grinding groove 110 is provided with a plurality of first sieve holes 111. The lower end of the grinding chamber 130 is provided with a second grinding groove 120. The second grinding groove 120 is provided with a plurality of second sieve holes 121. The aperture of the second sieve holes 121 is smaller than that of the first sieve holes 111. The first grinding head 200 is movably disposed inside the first grinding groove 110, and there is a first grinding gap between the end surface of the first grinding head 200 and the bottom surface of the first grinding groove 110. The second grinding head 300 is movably disposed inside the second grinding groove 120, and there is a second grinding gap between the end surface of the second grinding head 300 and the bottom surface of the second grinding groove 120. The shaping device 900 is communicated with the lower end of the grinding cylinder 100. The shaping device 900 is internally provided with a shaping mold, and the shaping device 900 is used to heat and shape the waste coming from the grinding chamber 130. Among them, the surfaces of the first grinding head 200 and the second grinding head 300 are both provided with pits 400 for grinding.

[0038] In actual use, waste materials are poured into the first grinding groove 110 above the grinding cylinder 100. The movable first grinding head 200 is used to cooperate with the bottom surface of the first grinding groove 110 to roll and grind the waste materials, so that the waste materials are rolled into pre-treated materials that can pass through the first sieve holes 111. The pre-treated materials fall into the second grinding groove 120, and the second grinding head 300 cooperates with the second grinding groove 120 to further roll and grind the pre-treated materials, making them into smaller debris, meeting the final process requirements. In summary, the first grinding head 200 and the second grinding head 300 respectively cooperate with the first grinding groove 110 and the second grinding groove 120 to roll and grind the waste materials, adding a pre-treatment before the fine grinding process, improving the overall efficiency and grinding quality.

[0039] In actual use, to improve the grinding effect, the pit grooves 400 are spirally covered on the end faces of the first grinding head 200 and the second grinding head 300. The spiral structure can continuously apply high pressure on the waste materials for extrusion, making them fully crushed, thus improving the efficiency.

[0040] A hopper 800 is provided at the upper end of the grinding cylinder 100. Above the hopper 800, a screw extruder is provided, and the hopper 800 is located below the discharge end of the screw extruder. And the hopper 800 is used to centrally collect the waste materials.

[0041] From the top end of the grinding cylinder 100, a rotating shaft 500 is disposed through the grinding cylinder 100. The end of the rotating shaft 500 extends into the bottom of the grinding cavity 130. Both the first grinding head 200 and the second grinding head 300 are fixed on the rotating shaft 500, so that the first grinding head 200 can pivot around a fixed axis in the first grinding groove 110, and the second grinding head 300 can pivot around a fixed axis in the second grinding groove 120. By rotating the rotating shaft 500, the first grinding head 200 and the second grinding head 300 can rotate synchronously, continuously grinding the waste materials and improving the efficiency.

[0042] Among them, the hopper 800 is fixedly connected with a connecting plate 810. The end of the rotating shaft 500 is pivotally connected to the connecting plate 810. Driven by the rotating shaft 500, the two work together to continuously grind the waste materials. Among them, the connecting plate 810 is used to install the rotating shaft 500, so that the rotating shaft 500 can pivot stably. Specifically, a driving motor 510 is provided at the upper end of the rotating shaft 500, and the driving motor 510 is used to drive the rotating shaft 500 to pivot. Among them, the connecting plate 810 is provided with a motor base 820, and the driving motor 510 is fixedly connected with the motor base 820.

[0043] In the vertical cross-section, the end faces of the first grinding head 200, the end faces of the second grinding head 300, the first grinding groove 110 and the second grinding groove 120 are all arc-shaped; wherein, the central axes of the first grinding head 200 and the first grinding groove 110 coincide, and the diameter of the end face of the first grinding head 200 is smaller than the diameter of the bottom surface of the first grinding groove 110, so that the width of the first grinding gap gradually increases from the middle to both sides; the central axes of the second grinding head 300 and the second grinding groove 120 coincide, and the diameter of the end face of the second grinding head 300 is smaller than the diameter of the bottom surface of the second grinding groove 120, so that the width of the second grinding gap gradually increases from the middle to both sides.

[0044] In actual use, the relative sliding between the end face of the first grinding head 200 and the bottom surface of the first grinding groove 110, and the relative sliding between the end face of the second grinding head 300 and the bottom surface of the second grinding groove 120 can continuously roll and grind the waste materials. Through repeated rolling and grinding, the arc-shaped first grinding groove 110 and second grinding groove 120 can make the waste materials press against the bottoms of the first grinding groove 110 and the second grinding groove 120. When the waste materials at the bottom are ground and fall out from the first sieve holes 111 and the second sieve holes 121, the surrounding waste materials will continue to gather towards the bottom under the action of gravity, increasing the pressure on the waste materials and improving the grinding effect.

[0045] In some embodiments, a plurality of stirring rods 600 are arranged on the side wall of the rotating shaft 500. The plurality of stirring rods 600 are arranged at intervals in the circumferential direction of the rotating shaft 500, and the stirring rods 600 are located in the grinding cavity 130. The stirring rods 600 can disperse the waste materials falling from the first grinding groove 110, making them dispersed, which is convenient for subsequent grinding and crushing in the second grinding groove 120.

[0046] Preferably, the part of the rotating shaft 500 placed in the grinding cavity 130 includes two grinding sections 520 and a dispersing section 530. A plurality of stirring rods 600 are arranged on the dispersing section 530, and the dispersing section 530 is arranged between the two grinding sections 520. Among them, grinding protrusions 700 are arranged on the grinding sections 520. The grinding protrusions 700 are spirally wound around the rotating shaft 500. In the vertical cross-section, there is a third grinding gap between the grinding protrusions 700 and the inner side wall of the grinding cavity 130. When the waste materials fall from the first grinding groove 110 and fall in the grinding cavity 130, the grinding protrusions 700 cooperate with the third grinding gap. On the one hand, they can crush the waste materials, and on the other hand, they can also disperse the waste materials sticking together. On the other hand, through the cooperation of the grinding protrusions 700 and the stirring rods 600, the waste materials from the first grinding groove 110 can be better dispersed, which is convenient for the second grinding head 300 to grind and crush them.

[0047] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A method for grinding paper waste, characterized in that, It includes the following steps: Step 1: Pretreatment, squeezing out the moisture in the waste, separating the iron materials and sediment in the waste; Step 2: First ball milling, feeding the material into the first grinding tank (110), using the first grinding head (200) to cooperate with the first grinding tank (110) to grind the waste, and the ground waste enters the grinding chamber (130) through the first sieve holes (111); Step 3: Second ball milling, the waste enters the second grinding tank (120) from the screw barrel, using the second grinding head (300) to cooperate with the second grinding tank (120) to grind the waste, and further finely grinding it into powder; Step 4: Shaping, injecting the waste into a shaping mold, and processing the waste into a shape through an injection molding machine; Among them, in Step 2 and Step 3, when the waste enters the first grinding tank (110) or the second grinding tank (120), 3% - 12% of the extrusion conversion agent is added synchronously.

2. The papermaking waste grinding equipment according to claim 1, wherein, The said Step 1 includes the following sub - steps: Step 1.1: Iron removal, using a magnetic separation conveyor to transport the waste to the pneumatic conveying mechanism, and using the magnetic roller in the magnetic separation conveyor to adsorb the miscellaneous iron; Step 1.2: Removal of sediment and stone particles, using the pneumatic conveying mechanism to transport the waste into the screw extruder; Step 1.3: Squeezing dry, using the screw extruder to transport the waste into the first grinding tank (110).

3. A papermaking waste grinding device for performing the papermaking waste grinding method according to any one of claims 1 to 2, characterized in that, It includes: A grinding cylinder (100) with a grinding chamber (130) built - in. The upper end of the grinding cylinder (100) is provided with a first grinding tank (110), the bottom surface of the first grinding tank (110) is provided with a plurality of first sieve holes (111), the lower end of the grinding chamber (130) is provided with a second grinding tank (120), the second grinding tank (120) is provided with a plurality of second sieve holes (121), and the aperture of the second sieve holes (121) is smaller than that of the first sieve holes (111); A first grinding head (200) movably built - in the first grinding tank (110), with a first grinding gap between the end face of the first grinding head (200) and the bottom surface of the first grinding tank (110); A second grinding head (300) movably built - in the second grinding tank (120), with a second grinding gap between the end face of the second grinding head (300) and the bottom surface of the second grinding tank (120); A shaping device (900) communicated with the lower end of the grinding cylinder (100), with a shaping mold built - in the shaping device (900), and the shaping device (900) is used to heat - shape the waste coming from the grinding chamber (130); Among them, the surfaces of the first grinding head (200) and the second grinding head (300) are both provided with pits (400) for grinding.

4. The papermaking waste grinding equipment according to claim 3, wherein, The upper end of the grinding cylinder (100) is provided with a hopper (800), above the hopper (800) there is a screw extruder, and the hopper (800) is located below the discharge end of the screw extruder.

5. The papermaking waste grinding equipment according to claim 4, characterized in that, From the top end of the grinding cylinder (100), a rotating shaft (500) is disposed through the grinding cylinder (100). The end of the rotating shaft (500) extends into the bottom of the grinding cavity (130). The first grinding head (200) and the second grinding head (300) are both fixed to the rotating shaft (500), so that the first grinding head (200) can pivot around a fixed axis in the first grinding groove (110), and the second grinding head (300) can pivot around a fixed axis in the second grinding groove (120). Wherein, the hopper (800) is fixedly connected with a connecting plate (810), and the end of the rotating shaft (500) is pivotally connected to the connecting plate (810).

6. The papermaking waste grinding equipment according to claim 5, wherein, In the vertical cross-section, the end face of the first grinding head (200), the end face of the second grinding head (300), the first grinding groove (110) and the second grinding groove (120) are all arc-shaped; wherein, the central axis of the first grinding head (200) coincides with the central axis of the first grinding groove (110), and the end face diameter of the first grinding head (200) is smaller than the bottom diameter of the first grinding groove (110), so that the width of the first grinding gap gradually increases from the middle to both sides; the central axis of the second grinding head (300) coincides with the central axis of the second grinding groove (120), and the end face diameter of the second grinding head (300) is smaller than the bottom diameter of the second grinding groove (120), so that the width of the second grinding gap gradually increases from the middle to both sides.

7. The papermaking waste grinding equipment according to claim 5, characterized in that, A driving motor (510) is disposed at the upper end of the rotating shaft (500), and the driving motor (510) is used to drive the rotating shaft (500) to pivot. Wherein, the connecting plate (810) is provided with a motor seat (820), and the driving motor (510) is fixedly connected to the motor seat (820).

8. The papermaking waste grinding equipment according to claim 4, characterized in that, A plurality of stirring rods (600) are disposed on the side wall of the rotating shaft (500). The plurality of stirring rods (600) are spaced at intervals in the circumferential direction of the rotating shaft (500), and the stirring rods (600) are located in the grinding cavity (130).

9. The papermaking waste grinding equipment according to claim 8, characterized in that The part of the rotating shaft (500) disposed in the grinding cavity (130) includes two grinding sections (520) and a dispersing section (530). The dispersing section (530) is provided with a plurality of the stirring rods (600), and the dispersing section (530) is disposed between the two grinding sections (520). Wherein, the grinding section (520) is provided with grinding protrusions (700), and the grinding protrusions (700) are spirally wound around the rotating shaft (500). In the vertical cross-section, there is a third grinding gap between the grinding protrusions (700) and the inner side wall of the grinding cavity (130).

10. The papermaking waste grinding method according to claim 3, wherein, The pit grooves (400) are spirally covered on the end faces of the first grinding head (200) and the second grinding head (300).

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