Wastewater treatment device for waste paper remanufacturing

Abstract

The embodiment of the invention provides a waste water treatment device for waste paper remanufacturing, and relates to the technical field of waste water treatment. The wastewater treatment device for waste paper remanufacturing comprises a treatment box, a first screen, a second screen, a rotating part and a moving part, the upper side and the lower side of the treatment box are connected with a water inlet pipe and a water outlet pipe correspondingly, and a cavity in the treatment box is divided into a first cavity, a second cavity and a storage cavity from top to bottom through the first screen and the second screen; the state that the first face of the first screen faces the water inlet pipe is a first state, the state that the second face of the first screen faces the water inlet pipe is a second state, the rotating part is used for driving the first screen to rotate so that the first screen can be switched between the first state and the second state, and the moving part is used for driving the second screen to enter and exit the treatment box. The device has the effect of improving the wastewater treatment efficiency.

Description

Technical Field

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

[0002] Papermaking wastewater, primarily composed of particulate impurities, organic matter, and toxic substances, can be reused after undergoing physical, chemical, and biological treatment. Removing large suspended solids, such as fiber fragments, through screening is a key step in papermaking wastewater treatment.

[0003] The inventors discovered during actual production that some wastewater treatment devices using fixed screens (such as flat screens) require shutting down the machine, removing the screen, and cleaning it with a scraper or brush. This time-consuming cleaning process results in low wastewater treatment efficiency. Summary of the Invention

[0004] The present invention aims to provide a wastewater treatment device for waste paper recycling, which can improve wastewater treatment efficiency.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a wastewater treatment device for waste paper recycling, comprising: A treatment box having a cavity for containing wastewater, with an inlet pipe and an outlet pipe connected to the upper and lower sides of the treatment box respectively; a first screen and a second screen disposed in the cavity, wherein the first screen and the second screen divide the cavity into a first chamber, a second chamber, and a storage chamber from top to bottom, the water inlet pipe being in communication with the first chamber, and the water outlet pipe being in communication with the storage chamber; a rotating member disposed in the treatment box, wherein the first screen has a first surface and a second surface, wherein the edge of the first screen is in contact with the inner wall of the treatment box and the first surface faces the water inlet pipe in a first state, and the edge of the first screen is in contact with the inner wall of the treatment box and the second surface faces the water inlet pipe in a second state, and wherein the rotating member is used to drive the first screen to rotate so as to switch the first screen between the first state and the second state; The moving member is arranged in the processing box and connected with the second screen, so as to drive the second screen to enter and exit the processing box.

[0006] In an optional embodiment, the top wall of the cavity is provided with a plurality of branch pipes connected to the water inlet pipe, and the branch pipes are provided with a plurality of water outlets.

[0007] In an optional embodiment, a rotating shaft is horizontally arranged in the first screen, and both ends of the rotating shaft are rotatably connected to the processing box.

[0008] In an optional embodiment, the first screen is arranged obliquely in the cavity.

[0009] In an optional embodiment, the rotating member includes a rotating seat, a rotating block, a steel ball and a spring, both ends of the rotating shaft extend outside the processing box, the rotating seat is arranged outside the processing box and covers the rotating shaft, a raised rotating block is provided at the end of the rotating shaft, and a receiving groove for accommodating the rotating block is provided on the rotating seat, wherein, A sliding groove is provided on the rotating block in a radial direction, the steel ball is slidably arranged in the sliding groove, the spring is arranged in the sliding groove and connected to the steel ball, and the spring makes the steel ball always have a tendency to move toward the outside of the rotating block; Two clamping grooves for accommodating steel balls are provided on the inner wall of the accommodating groove. When the first screen rotates to be in the first state or the second state, the steel balls are respectively located in the two clamping grooves.

[0010] In an optional embodiment, the rotating member further includes a magnet block and a magnet bar, the magnet block is embedded in the inner walls on both sides of the cavity, the magnet bar is arranged at the lower end of the first screen, and the magnet block and the magnet bar attract each other.

[0011] In an optional embodiment, the moving part includes a cylinder and a screen frame, a strip hole is opened on one side of the processing box, the screen frame is used to accommodate the second screen, the cylinder is connected to the screen frame, the cylinder is arranged in the processing box and connected to the screen frame, and the cylinder is used to drive the screen frame to enter and exit the processing box through the strip hole.

[0012] In an optional embodiment, a guide rail for supporting the screen frame is provided on the inner wall of the cavity.

[0013] In an optional embodiment, a sealing ring is provided on the edge of the first screen.

[0014] In an optional embodiment, a plurality of legs are provided at the bottom of the processing box.

[0015] The beneficial effects of the wastewater treatment device for waste paper recycling provided by the embodiment of the present invention include: During the treatment of papermaking wastewater to remove large impurities, the wastewater is filtered through a first screen, where large impurities accumulate on the surface of the first screen. The first screen is rotatably positioned within the treatment chamber. Initially, in the first state, the first surface filters the wastewater. When impurities accumulate on the first surface, preventing effective filtration, the first screen rotates from the first state to the second state under the action of a rotating member, with the first surface of the first screen facing downward. Impurities on the first surface fall onto the second screen under gravity. Simultaneously, wastewater flowing from the first chamber acts as a backwash against the first surface of the first screen, flushing any accumulated or adhered debris onto the second screen. Once all impurities on the first surface have fallen onto the second screen, the second screen can be removed using a movable member for cleaning or replacement. During this process, the first screen remains in the second state, allowing the second surface to continue filtering normally. This allows the cleaning of both the first and second screens without requiring downtime, completing the physical treatment process for the wastewater and improving wastewater treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of the structure of the processing box provided in this embodiment; Figure 2 A schematic structural diagram of the first screen provided in this embodiment in a first state; Figure 3 A schematic structural diagram of the first screen provided in this embodiment in the second state; Figure 4 A schematic structural diagram of the first screen provided in this embodiment; Figure 5 For the installation of the seat edge in this embodiment Figure 4 A sectional view with AA sectioning; Figure 6 For the installation of the seat edge in this embodiment Figure 4 A cross-sectional view of the middle BB; Figure 7 Schematic diagram of the structure of the moving part in this embodiment.

[0018] Icons: 100-processing box; 110-cavity; 111-first chamber; 112-second chamber; 113-storage chamber; 120-water inlet pipe; 121-branch pipe; 130-water outlet pipe; 140-support leg; 150-bar hole; 200-first screen; 210-first surface; 220-second surface; 230-rotating shaft; 300-second screen; 400-rotating part; 410-rotating seat; 411-accommodating groove; 412-clamping groove; 420-rotating block; 421-slide groove; 430-steel ball; 440-spring; 450-magnet block; 460-magnet bar; 500-moving part; 510-cylinder; 520-screen frame. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0022] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0024] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0025] The deinking, screening, bleaching, pulping, and slurry mixing processes in the waste paper recycling process all require a large amount of water. This also results in a large amount of wastewater generated in the papermaking process, which seriously wastes water resources. Due to environmental regulations, water conservation, and corporate social responsibility, the papermaking industry currently generally treats and recycles the wastewater generated. The main components of the wastewater generated by the waste paper recycling process are particulate impurities, organic matter, and hazardous substances. Wastewater treatment processes generally include physical treatment, chemical treatment, and biological treatment. Among them, the physical treatment process is the key step in wastewater treatment and is used to remove particulate impurities in papermaking wastewater.

[0026] However, for some current papermaking wastewater physical treatment devices that use fixed screens, cleaning the screens requires shutting down the machine, removing the screens, cleaning them with tools like scrapers or brushes, and then reinstalling the cleaned screens into the physical treatment device. This cleaning process is laborious and requires additional time, resulting in low wastewater treatment efficiency.

[0027] To address the above-mentioned issues, the present invention provides a wastewater treatment device for waste paper recycling, which facilitates screen cleaning without shutting down the machine, thereby improving wastewater treatment efficiency. The following describes in detail the overall structure, operating principle, and technical effects of the wastewater treatment device for waste paper recycling provided by the present invention through examples and accompanying drawings.

[0028] Please refer to Figure 1-Figure 3 The wastewater treatment device for waste paper recycling provided by the present invention is applied to the papermaking industry to treat wastewater generated during the waste paper recycling process, removing large impurities, such as paper fibers, from the wastewater through a physical treatment process. Furthermore, if large impurities accumulate on the screen, the screen can be cleaned during the physical treatment process, eliminating the need to shut down the machine and disassemble the screen for cleaning, thereby improving wastewater treatment efficiency.

[0029] The wastewater treatment device for waste paper recycling provided by the present invention includes a treatment box 100, a first screen 200, and a second screen 300. The treatment box 100 is a hollow rectangular box with a cavity 110 for accommodating wastewater. An inlet pipe 120 is connected to the top of the treatment box 100 for inputting wastewater to be treated, and an outlet pipe 130 is connected to the bottom of the treatment box 100 for discharging wastewater that has undergone physical treatment. The first screen 200 and the second screen 300 are both installed in the treatment box 100 and located in the cavity 110. The first screen 200 and the second screen 300 divide the cavity 110 from top to bottom into a first chamber 111, a second chamber 112, and a storage chamber 113. The inlet pipe 120 is connected to the cavity 110 at the top of the treatment box 100, and the outlet pipe 130 is connected to the storage chamber 113 at the bottom of the treatment box 100. The first screen 200 is rotatably mounted in the processing box 100. The first screen 200 has a first surface 210 and a second surface 220. The first surface 210 and the second surface 220 are respectively on both sides of the first screen 200, and both have the same processing effect. Figure 2 The edge of the first screen 200 is in contact with the inner wall of the processing box 100 and the first surface 210 faces the water inlet pipe 120, which is the first state; Figure 3 , the state in which the edge of the first screen 200 is in contact with the inner wall of the treatment box 100 and the second surface 220 is facing the water inlet pipe 120 is the second state. Furthermore, the treatment device also includes a rotating member 400, which is disposed on the treatment box 100 and is used to drive the first screen 200 to rotate so that the first screen 200 switches between the first state and the second state. Furthermore, the treatment device also includes a moving member 500, which is disposed on the treatment box 100 and is connected to the second screen 300 to drive the second screen 300 in and out of the treatment box 100.

[0030] By setting the first screen 200 and the second screen 300 in the treatment box 100, the first screen 200 is rotatably set in the treatment box 100, so that in the physical treatment step of the papermaking wastewater treatment process, the wastewater enters the treatment box 100, the wastewater is filtered through the first screen 200, and the large particles of impurities in the wastewater are accumulated on the surface of the first screen 200. Take the initial state as the first state as an example ( Figure 2(See the state shown). When impurities accumulate on first surface 210 and cannot be effectively filtered, first screen 200 rotates from the first state to the second state under the action of rotating member 400, and first surface 210 of first screen 200 rotates downward. Impurities on first surface 210 fall onto second screen 300 under the action of gravity. Simultaneously, wastewater flowing from first chamber 111 also acts as a backwash on first surface 210 of first screen 200, flushing debris accumulated and adhered to first surface 210 onto second screen 300. Once all impurities on first surface 210 have fallen onto second screen 300, second screen 300 can be removed using movable member 500 for cleaning or replacement. During this process, the first screen 200 is in the second state, and the second surface 220 can perform the filtering function normally. The first screen 200 and the second screen 300 can be cleaned without stopping the machine, thereby completing the physical treatment of the wastewater and improving the wastewater treatment efficiency.

[0031] It is understandable that when the initial state of the first screen 200 is the second state ( Figure 3 The principle behind this state is the same as that of the first screen 200, which is initially in the first state. Wastewater to be treated enters the water inlet pipe 120 and reaches the second surface 220. Impurities accumulate on the second surface 220, preventing effective filtration. The first screen 200, under the action of the rotating member 400, rotates from the second state to the first state, and the second surface 220 of the first screen 200 rotates downward. Impurities on the second surface 220 fall onto the second screen 300 under the action of gravity. Simultaneously, the wastewater flowing from the first chamber 111 also acts as a backwash on the second surface 220 of the first screen 200, flushing debris accumulated and adhered to the second surface 220 onto the second screen 300. Once all the impurities on the second surface 220 have fallen onto the second screen 300, the second screen 300 can be removed using the movable member 500 for cleaning or replacement.

[0032] It can be understood that the outlet pipe 130 is connected to subsequent wastewater treatment devices such as chemical treatment and biological treatment to further treat the wastewater after physical treatment by the treatment device of the present invention until it meets the recycling standards. The relevant devices and equipment involved in the subsequent wastewater treatment process are not limited in this embodiment.

[0033] Please refer to Figure 2 and Figure 3To prevent wastewater from concentrating on the surface of the first screen 200 when entering the first screen 200 from the water inlet pipe 120, which would cause impurities to accumulate in certain areas of the first screen 200 and affect the filtration effect, in this embodiment, multiple branch pipes 121 connected to the water inlet pipe 120 are provided within the treatment box 100 and at the top of the cavity 110. The branch pipes 121 are provided with multiple water outlets on the side facing the first screen 200. This ensures that the wastewater entering the first chamber 111 through the water inlet pipe 120 is evenly distributed on the first screen 200, preventing localized blockage of the first screen 200 and affecting the filtration effect.

[0034] Please refer to Figure 4-Figure 5 In this embodiment, in order to facilitate the rotation of the first screen 200 in the processing box 100, a rotating shaft 230 is horizontally arranged in the first screen 200, and the two ends of the rotating shaft 230 are rotatably connected to the two side boxes of the processing box 100, so that the first screen 200 can be easily rotated with the rotating shaft 230 as the axis.

[0035] Please refer to Figure 4-Figure 6 In this embodiment, the first screen 200 is tilted and arranged in the cavity 110. The rotating member 400 includes a rotating seat 410, a rotating block 420, a steel ball 430 and a spring 440. Both ends of the rotating shaft 230 pass through the processing box 100 and extend to the outside of the processing box 100. The rotating seat 410 is a hollow cover. The rotating seat 410 can be detachably mounted on the outer wall of the processing box 100 and is covered by the rotating shaft 230. A raised cylindrical rotating block 420 is provided at the end of the rotating shaft 230. A receiving groove 411 for accommodating the rotating block 420 is provided on the rotating seat 410. The rotating block 420 is located in the receiving groove 411 and can rotate in the receiving groove 411. Furthermore, a sliding groove 421 is provided on the rotating block 420 in the radial direction. The steel ball 430 is slidably arranged in the sliding groove 421, so that the steel ball 430 can move in the rotating block 420 along the radial direction of the rotating block 420. A spring 440 is disposed within the chute 421 and connected to the steel ball 430. The spring 440 is always compressed, thereby causing the steel ball 430 to consistently move along the chute 421 toward the outside of the rotating block 420. Because the rotating block 420 is engaged within the receiving groove 411, the steel ball 430 is squeezed into the chute 421, and the spring 440 is compressed. Furthermore, two engaging grooves 412 are defined on the inner wall of the receiving groove 411 for accommodating the steel ball 430. The engaging grooves 412 are arc-shaped grooves adapted to accommodate the steel ball 430, and the arc between the two engaging grooves 412 is the same as the arc between the first and second states of the first screen 200. Specifically, when the first screen 200 is rotated to either the first or second state, the steel ball 430 is located within each of the two engaging grooves 412.

[0036] By providing a rotating block 420 that is rotatably mounted on the rotating seat 410, and providing a steel ball 430 and a snap-in groove 412, when the first screen 200 is in the first state or the second state, the steel ball 430 snaps into one of the snap-in grooves 412. At this time, the first screen 200 is fixed by the action of the steel ball 430, so that the first screen 200 is tilted and remains in contact with the inner wall of the cavity 110. As the physical treatment of the wastewater proceeds, as more and more impurities accumulate on the first screen 200, the impurities clog the mesh of the first screen 200, and the filtration efficiency of the first screen 200 decreases until the filtration volume of the first screen 200 is less than the water inlet volume of the water inlet pipe 120. At this time, the wastewater is retained in the first chamber 111. As the wastewater accumulates on the surface of first screen 200, the squeezing force on steel ball 430 gradually increases. When the component of this squeezing force toward the axis of rotating shaft 230 becomes greater than the elastic force of spring 440, the weight of the wastewater causes steel ball 430 to be squeezed into chute 421, causing first screen 200 to rotate. Driven by inertia and the impact of the wastewater, the lower end of first screen 200 rotates toward the other inner wall of treatment tank 100 until steel ball 430 engages with the other engaging groove 412, thereby switching first screen 200 between the first and second positions within treatment tank 100.

[0037] Please refer to Figure 2-Figure 4 Furthermore, in order to enable the first screen 200 to smoothly switch between the first state and the second state after impurities accumulate on the surface, the rotating member 400 also includes a magnet block 450 and a magnet bar 460. The magnet block 450 is embedded and installed on the inner walls on both sides of the cavity 110, and the magnet block 450 is in the shape of a long strip. The length of the magnet block 450 is the same as the width of the corresponding side of the processing box 100. The magnet bar 460 is set at the lower end of the first screen 200. The magnet block 450 and the magnet bar 460 attract each other, and when the first screen 200 is in the first state or the second state, the magnet bar 460 is respectively opposite to the magnet block 450 on the inner walls on both sides of the cavity 110.

[0038] By configuring the rotating member 400 with a magnet block 450 and a magnet bar 460, when the first screen 200 is in the first state or the second state, the first screen 200 is adsorbed and connected to the corresponding magnet block 450 via the magnet bar 460, thereby maintaining the first screen 200 in an inclined state and in contact with the inner wall of the cavity 110. When the first screen 200 switches between the first state and the second state, the lower end of the first screen 200 rotates from one inner wall of the treatment tank 100 toward the other inner wall of the treatment tank 100 due to the impact force and inertia of the wastewater. When the first screen 200 rotates close to the inner wall of the treatment tank 100, the magnet bar 460 at the bottom of the first screen 200 is attracted by the magnet block 450 on the inner wall of the treatment tank 100. Therefore, when the first screen 200 rotates close to the inner wall of the processing box 100 , it can be stably attached to the inner wall, and the steel ball 430 can be smoothly engaged in the engaging groove 412 , so as to facilitate subsequent filtering operations through the first screen 200 .

[0039] Please refer to Figure 7 In some optional embodiments, in order to facilitate driving the second screen 300 in and out of the cavity 110, so as to clean the impurities on the second screen 300, the moving part 500 includes a cylinder 510 and a screen frame 520, which are combined Figure 1 A strip hole 150 is horizontally provided on one side of the treatment box 100. The screen frame 520 is a hollow rectangular frame whose shape and size are adapted to the shape and size of the cavity 110. The internal dimensions of the screen frame 520 are adapted to the second screen 300, and the screen frame 520 is used to accommodate the second screen 300. The cylinder 510 is mounted on the outer wall of the treatment box 100, and the piston rod of the cylinder 510 is connected to the screen frame 520. The cylinder 510 is used to drive the screen frame 520 into and out of the treatment box 100 through the strip hole 150. Furthermore, in order to ensure that the second screen 300 maintains structural stability when impacted by wastewater in the treatment box 100, a guide rail (not shown in the drawings) is also provided on the inner wall of the cavity 110. The upper surface of the guide rail is flush with the lower end hole wall of the strip hole 150, so that when the screen frame 520 enters the cavity 110, the lower end of the screen frame 520 contacts the guide rail and moves along the guide rail. The guide rails serve to support the filter frame on one hand, and to guide the filter frame when it moves on the other hand.

[0040] It is understood that the second screen 300 is located at the bottom of the screen frame 520, so that a certain amount of accommodation space is provided within the screen frame 520 and above the second screen 300. This accommodation space can accommodate impurities that fall onto the second screen 300, so that when the screen frame 520 moves toward the outside of the processing box 100, the garbage on the second screen 300 can be taken out of the processing box 100. In addition, the upper surface of the screen frame 520 is provided with an inclined surface facing the second screen 300, so that the thickness of the upper end frame of the screen frame 520 gradually decreases. This allows impurities that fall onto the surface of the screen frame 520 to slide down the inclined surface, preventing impurities from accumulating on the screen frame 520.

[0041] It is understood that in order to improve the filtering effect of the first screen 200, a sealing ring is provided at the edge of the first screen 200. The sealing ring is made of rubber. When the first screen 200 is in the first state and the second state, the sealing ring fills the gap between the first screen 200 and the inner wall of the cavity 110, thereby preventing untreated wastewater in the first chamber 111 from penetrating into the second chamber 112 through the gap between the first screen 200 and the inner wall of the cavity 110. Similarly, in order to prevent untreated wastewater in the second chamber 112 from penetrating into the storage chamber 113 through the gap between the screen frame 520 and the inner wall of the cavity 110, a sealing ring is also provided at the edge of the screen frame 520.

[0042] Please refer to Figure 1 A plurality of legs 140 are provided at the bottom of the treatment box 100 for supporting the treatment box 100 to improve the applicable scope of the treatment box 100 and facilitate the installation of the treatment box 100 at different locations for wastewater treatment.

[0043] In summary, the present invention provides a wastewater treatment device for waste paper recycling that operates as follows: A first screen 200 and a second screen 300 are disposed within a treatment tank 100. During the physical treatment of wastewater entering the treatment tank 100, the wastewater is filtered through the first screen 200, and large particles of impurities in the wastewater accumulate on the surface of the first screen 200. The first screen 200 is rotatably disposed within the treatment tank 100. For example, when impurities accumulate on the first surface 210, preventing effective filtration, the first screen 200 rotates from the first state to the second state under the action of the rotating member 400. The first surface 210 of the first screen 200 rotates downward. Impurities on the first surface 210 fall onto the second screen 300 due to gravity. Simultaneously, wastewater flowing from the first chamber 111 also acts as a backwash against the first surface 210 of the first screen 200, flushing any debris accumulated or adhering to the first surface 210 onto the second screen 300. When all impurities on the first surface 210 have fallen onto the second screen 300, the second screen 300 can be removed by the movable member 500 and cleaned or replaced. During this process, the first screen 200 is in the second state, and the second surface 220 can perform its filtering function normally. The first and second screens 200, 300 can be cleaned without stopping the machine, thereby improving the wastewater treatment efficiency.

[0044] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention.

Claims

1. A wastewater treatment device for waste paper recycling, characterized in that: include: A treatment box (100) having a cavity (110) for accommodating wastewater, wherein the upper and lower sides of the treatment box (100) are respectively connected to a water inlet pipe (120) and a water outlet pipe (130); A first screen (200) and a second screen (300) are arranged in the cavity (110), wherein the first screen (200) and the second screen (300) divide the cavity (110) from top to bottom into a first chamber (111), a second chamber (112), and a storage chamber (113); the water inlet pipe (120) is in communication with the first chamber (111), and the water outlet pipe (130) is in communication with the storage chamber (113); a rotating member (400) disposed on the processing box (100), wherein the first screen (200) has a first surface (210) and a second surface (220); a state in which the edge of the first screen (200) is in contact with the inner wall of the processing box (100) and the first surface (210) faces the water inlet pipe (120) is a first state; a state in which the edge of the first screen (200) is in contact with the inner wall of the processing box (100) and the second surface (220) faces the water inlet pipe (120) is a second state; and the rotating member (400) is used to drive the first screen (200) to rotate, so that the first screen (200) switches between the first state and the second state; A moving member (500) is provided in the processing box (100) and is connected to the second screen (300) so as to drive the second screen (300) to enter and exit the processing box (100).

2. The wastewater treatment device for waste paper recycling according to claim 1, characterized in that: The top wall of the cavity (110) is provided with a plurality of branch pipes (121) connected to the water inlet pipe (120), and the branch pipes (121) are provided with a plurality of water outlets.

3. The wastewater treatment device for waste paper recycling according to claim 1, characterized in that: A rotating shaft (230) is horizontally arranged in the first screen (200), and both ends of the rotating shaft (230) are rotatably connected to the processing box (100).

4. The wastewater treatment device for waste paper recycling according to claim 3, characterized in that: The first screen (200) is arranged obliquely in the cavity (110).

5. The wastewater treatment device for waste paper recycling according to claim 4, characterized in that: The rotating member (400) includes a rotating seat (410), a rotating block (420), a steel ball (430) and a spring (440). Both ends of the rotating shaft (230) extend outside the processing box (100). The rotating seat (410) is arranged outside the processing box (100) and covers the rotating shaft (230). A protruding rotating block (420) is provided at the end of the rotating shaft (230). A receiving groove (411) for receiving the rotating block (420) is provided on the rotating seat (410), wherein: A sliding groove (421) is provided on the rotating block (420) along a radial direction, the steel ball (430) is slidably arranged in the sliding groove (421), the spring (440) is arranged in the sliding groove (421) and connected to the steel ball (430), and the spring (440) enables the steel ball (430) to always have a tendency to move toward the outside of the rotating block (420); Two engaging grooves (412) for accommodating steel balls (430) are provided on the inner wall of the accommodating groove (411); when the first screen (200) rotates to the first state or the second state, the steel balls (430) are respectively located in the two engaging grooves (412).

6. The wastewater treatment device for waste paper recycling according to claim 4, characterized in that: The rotating member (400) further includes a magnet block (450) and a magnet bar (460), wherein the magnet block (450) is embedded in the inner walls on both sides of the cavity (110), and the magnet bar (460) is arranged at the lower end of the first screen (200), and the magnet block (450) and the magnet bar (460) attract each other.

7. The wastewater treatment device for waste paper recycling according to claim 1, characterized in that: The movable part (500) includes a cylinder (510) and a screen frame (520), a strip hole (150) is opened on one side of the processing box (100), and the screen frame (520) is used to accommodate the second screen (300), the cylinder (510) is connected to the screen frame (520), the cylinder (510) is set in the processing box (100) and connected to the screen frame (520), and the cylinder (510) is used to drive the screen frame (520) to enter and exit the processing box (100) through the strip hole (150).

8. The wastewater treatment device for waste paper recycling according to claim 7, characterized in that: A guide rail for carrying the screen frame (520) is provided on the inner wall of the cavity (110).

9. The wastewater treatment device for waste paper recycling according to claim 1, characterized in that: A sealing ring is provided on the edge of the first screen (200).

10. The wastewater treatment device for waste paper recycling according to claim 1, characterized in that: A plurality of supporting legs (140) are provided at the bottom of the processing box (100).

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