A dye recovery, oxidation and degradation device for dyeing and printing wastewater

Abstract

This invention relates to the field of dyeing and printing wastewater pollution control equipment, specifically to a dye recovery and oxidation degradation device for dyeing and printing wastewater. The device includes an oxidation tank and a separation cylinder. The separation cylinder is horizontally positioned below the oxidation tank. Inside the separation cylinder are a movable cover and a pressure plate capable of horizontal sealing and sliding. A filter press chamber is formed between the pressure plate and the movable cover, and this chamber is connected to the bottom of the oxidation tank. A core tube is connected to the side of the movable cover away from the pressure plate, and a sealing plate is provided on the top side of the movable cover that moves laterally with it. By integrating the oxidation tank and the separation cylinder, the sludge pit at the bottom of the oxidation tank is directly connected to the feed pipe of the separation cylinder, eliminating the need for additional auxiliary equipment such as sludge lifting pumps and conveying pipelines. A hydraulic cylinder drives the movable cover to move laterally, creating a filtration and squeezing effect, simultaneously completing the sedimentation, cake pressing, and water filtration processes. Furthermore, the volume of the drainage cavity formed by the sleeve and core tube continuously increases, creating a negative pressure suction effect, which helps the filter plate quickly discharge water, ensuring efficient filtrate collection.

Description

Technical Field

[0001] This invention relates to the field of dyeing and printing wastewater pollution control equipment, specifically to a dye recovery, oxidation, and degradation device for dyeing and printing wastewater. Background Technology

[0002] The dyeing and printing industry is one of the key areas for industrial wastewater discharge. During its production process, it generates a large amount of wastewater containing pollutants such as dyes, auxiliaries, and heavy metal ions. This type of wastewater is characterized by high color, high organic matter concentration, complex composition, and poor biodegradability. Direct discharge will cause serious damage to the aquatic ecosystem and soil environment. At the same time, the dye resources in the wastewater are not recovered, which also results in the waste of resources.

[0003] Currently, the oxidation treatment of dyeing and printing wastewater mostly adopts processes such as Fenton oxidation or ozone oxidation. These processes are usually carried out in open reaction tanks, and the dye flocculants generated during the oxidation process need to be separated into solid and liquid components.

[0004] The existing solid-liquid separation of dyeing and printing wastewater sedimentation mostly uses independent equipment such as plate and frame filter presses and centrifuges. Moreover, these devices rely on additional conveying equipment to connect with the front-end oxidation tank, resulting in serious mixing of sediment.

[0005] Specifically, because the oxidation tank and solid-liquid separation equipment are independent of each other, additional auxiliary devices such as sludge lift pumps and conveying pipelines are required to transport the sediment containing mixed water from the bottom of the oxidation tank to the separation equipment. However, during the transportation process, the sediment cannot be effectively separated from the unseparated water and residual dye. A large amount of water accompanies the sediment and enters the separation equipment along the lift pump, which not only increases the processing load of the separation equipment but also causes the dye to redissolve or disperse in the water, reducing the purity of dye recovery. At the same time, the conveying pipeline is prone to blockage due to sediment adhesion, requiring frequent shutdowns for cleaning, further affecting the processing efficiency.

[0006] Existing treatment equipment, such as plate and frame filter presses, requires manual installation and removal of filter cloths, which is cumbersome and time-consuming, with long single separation cycles, making it difficult to meet the continuous wastewater discharge requirements of dyeing and printing production lines. Centrifuges, on the other hand, suffer from the problem that dye flocs are highly adhesive and easily adhere to the inner wall of the equipment, forming scale, which leads to a gradual decrease in separation efficiency. Furthermore, the squeezing force of both types of equipment is difficult to control precisely, resulting in high moisture content in the filter cake formed by dye precipitation. This not only increases the energy consumption for drying subsequent dye recovery but also easily leads to excessive residual dye concentration in the filtrate, failing to meet environmental emission requirements.

[0007] In addition, the existing process requires separate installation of oxidation tanks, sludge lift pumps, separation equipment, and filtrate treatment devices. The equipment occupies a large area, and each link relies on manual control. For example, the start-up and shutdown frequency of the sludge lift pump and the feed rate of the separation equipment need to be adjusted manually according to the sedimentation and accumulation. The degree of automation is low, resulting in high energy consumption and serious waste of resources in the overall treatment process. Summary of the Invention

[0008] The purpose of this invention is to provide a dye recovery and oxidation degradation device for dyeing and printing wastewater in order to solve the above-mentioned problems. By integrating the oxidation tank and the separation cylinder, the sludge pit at the bottom of the oxidation tank is directly connected to the feed pipe of the separation cylinder, eliminating the need for additional auxiliary equipment such as sludge lifting pumps and conveying pipelines. The hydraulic cylinder drives the movable cover to move laterally, forming a filtration and squeezing action, and simultaneously completing the sedimentation and filtration actions. In addition, the volume of the drainage cavity composed of the sleeve and the core tube continuously increases, forming a negative pressure suction effect, which can help the filter disc to quickly discharge water and ensure the filtrate collection efficiency, as detailed below.

[0009] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a dye recovery and oxidation degradation device for dyeing and printing wastewater, comprising an oxidation tank and a separation cylinder. The separation cylinder is arranged horizontally below the oxidation tank. The separation cylinder is provided with a movable cover and a pressure plate that can slide horizontally and seal. A filter press chamber is formed between the pressure plate and the movable cover, and the filter press chamber is connected to the bottom of the oxidation tank. A core tube is connected to the side of the movable cover away from the pressure plate, and a sealing plate that can move horizontally with the movable cover is provided on the top side of the movable cover. The top of the separation cylinder is provided with a feed pipe that connects to the oxidation tank. The sealing plate can be moved laterally to close the bottom opening of the feed pipe. The bottom of the separation cylinder has a vertical discharge hole that runs through it on the side near the pressure plate. The pressure plate is fixed with a support rod that passes through the separation cylinder on the side corresponding to the discharge hole. A spring is sleeved on the outside of the support rod, with its two ends respectively pressing against the pressure plate and the inner end face of the separation cylinder. The compression stroke of the spring is greater than the distance between the pressure plate and the discharge hole.

[0010] The above-mentioned dye recovery and oxidation degradation device for dyeing and printing wastewater involves discharging the wastewater into an oxidation tank, adding oxidant and flocculant to the tank to oxidize the dye in the wastewater and form precipitates. After settling, the precipitates accumulate in the sludge pit and enter the filter press chamber inside the separation cylinder through the feed pipe. When it is necessary to discharge the precipitates, the following steps are followed: S1. Start the hydraulic cylinder to push the movable cover to move closer to the pressure plate to compress the sediment in the filter chamber. At the same time, the top side sealing plate of the movable cover moves horizontally to gradually cover and close the bottom of the feed pipe, cutting off the sediment input channel from the sludge pit to the filter chamber inside the separation cylinder. S2. As the movable hood gradually moves laterally closer to the pressure plate, the sediment in the filter chamber is squeezed out and the water is filtered out. The water flows into the sleeve along the filter plate of the movable hood. As the volume of the drainage cavity formed by the core tube and the sleeve continues to increase, a negative pressure is formed, which helps the filter plate to achieve suction and drainage. The water is guided to be discharged outward along the core tube and the return bend during the continuous squeezing process of the movable hood. The one-way valve ensures that the water discharged into the return bend cannot flow back. At the same time, the pressure plate is squeezed by the sediment in the filter chamber to counteract the spring force on the back side of the pressure plate. S3. The filter cake formed by the sedimentation and compression of the pressure plate continues to push and compress the spring. During the process of the pressure plate moving laterally to the discharge hole position under force, the extrusion mechanism composed of the movable cover and the pressure plate continuously extrudes and drains the filter cake. When the pressure plate and the movable cover move laterally to the positions on both sides of the discharge hole, the extrusion stroke ends. S4. At the same time, the balance frame of the movable cover moves laterally from the inner section of the anti-reverse frame to the outer expansion section. The balance frame disengages from the inner section to release the outward pushing and expanding effect of the balance frame on the two sets of anti-reverse frames. At this time, the entire anti-reverse frame retracts inward to the inner side of the constraint frame outside the pressure plate, thereby locking the lateral position of the pressure plate through the anti-reverse frame, that is, keeping the spring in a compressed and stored state. S5. As the anti-retracting frame retracts inward, the blocking section pushes the slider inside the constraint frame, thereby pushing the slider along the slide groove through the blocking section, which in turn drives the rack and pinion gear to rotate. The gear drives the transmission sleeve and the transmission bar inside to rotate. The transmission bar supports the screw and the unloading disc to rotate. Since the screw and the support rod are threaded together, the support screw drives the unloading disc to be pushed out of the receiving groove to assist the filter cake to separate from the pressure plate surface. S6. After the movable cover and pressure plate are moved horizontally above the discharge hole, the hydraulic cylinder reverses to pull the movable cover back to its original position. Since the anti-reverse frame supports and locks the pressure plate in the spring-loaded compression position, and the discharge plate rotates out from the surface of the stationary pressure plate, it can support the filter cake to be discharged downward from the discharge hole. S7. During the horizontal repositioning process of the movable cover, the sleeve is continuously sleeved to the outside of the core tube. The volume of the drainage cavity formed by the two gradually decreases. Some of the gas and water remaining on the core tube side of the one-way valve are discharged in the opposite direction along the filter disc to backwash the filter screen. S8. When the balance frame of the movable cover moves laterally to the inner section of the push-back frame, it pushes the inner section outward to keep the push-back frame outward, thereby releasing the support and locking effect of the push-back frame on the constraint frame. At this time, the spring push-back pressure plate in the compressed and stored state quickly resets to flush the backwash water discharged into the filter press chamber to the other side of the filter screen. At the same time, the movable cover drives the sealing plate to move laterally to the position of pushing away from the feed pipe. The bottom opening of the feed pipe opens, and the sediment in the sludge pit can continue to be input into the filter press chamber to repeat the next squeezing and discharge action.

[0011] Preferably, the system also includes a frame, which is disposed outside the separation cylinder. A hydraulic cylinder for supporting the transverse movement of the movable cover is fixed to the outside of the frame, and a side tie rod that is longitudinally connected to the frame is fixed to the outside of the separation cylinder.

[0012] Preferably, a filter disc is installed at the opening of the movable cover near the pressure plate. The center of the filter disc is a mesh filter screen. The filter disc and the pressure plate cooperate to form a compression mechanism for compressing the sediment in the filter chamber.

[0013] Preferably, the outer side of the movable cover is connected to a sleeve that extends to the outside of the core tube, the sleeve and the core tube are slidably sealed, and a balance frame connected to the extension end of the hydraulic cylinder is fixed at the outer end of the sleeve.

[0014] Preferably, the support rod has a mounting flange fixed at one end extending out of the separation cylinder, and the support rod is connected to a rectangular frame constraint frame through the mounting flange. The frame is equipped with two sets of anti-reverse frames symmetrically arranged on the front and rear sides of the separation cylinder, and the anti-reverse frames are rotatably connected to the frame.

[0015] Preferably, the inner side of the frame is fixed with a rotating lug for mounting a backstop frame. Two sets of backstop frames are pressed together towards the side close to the separator cylinder. The backstop frame includes an inner section that is rotatably connected to the rotating lug. The outer end of the inner section is fixed with an outwardly expanding section that tilts outward. The outer end of the expanding section is bent inward to form a locking section. The inner section abuts against the outer side of the balance frame. When the balance frame moves laterally to disengage from the inner section, the backstop frame rotates to a position that fits against the outer wall of the separator cylinder. The locking section serves as a locking structure for limiting the constraint frame and prevents the spring in the compressed state from returning to its original position.

[0016] Preferably, the pressure plate is provided with a material ejector plate on the side near the movable cover. A screw rod is fixed in the middle of the material ejector plate, passing through the support rod and extending into the constraint frame. The screw rod is threaded to the inner wall of the support rod. A transversely extending transmission bar is fixed at the outer end of the screw rod. A transmission sleeve is rotatably provided in the constraint frame. The transmission sleeve has a transmission hole through its middle to accommodate the sliding passage of the transmission bar. The transmission hole is adapted to the longitudinal section of the transmission bar to maintain synchronous rotation.

[0017] Preferably, the constraint frame is provided with sliding grooves on both the front and rear sides near the separation cylinder. A slider that can abut against the support block is longitudinally slidably fitted in the sliding groove. A longitudinally extending rack is fixed inside the slider. The two racks are staggered vertically, and the end face of the transmission sleeve is a gear that meshes with the two sets of racks.

[0018] Preferably, a longitudinally penetrating light rod is installed inside the slide groove, and the light rod is in clearance fit with the slide block. A compression spring is sleeved on the outside of the light rod, and the compression spring keeps the slide block pressed against the outside. The end face of the pressure plate is provided with a receiving groove for accommodating the ejector plate, and the ejector plate is flush with the end face of the pressure plate. The outer port of the core tube is connected to a return elbow through a one-way valve.

[0019] Preferably, the oxidation tank has a sludge pit at the bottom connected to the feed pipe, and an equipment platform is installed at the top of the oxidation tank. The bottom of the equipment platform has a rotating shaft tube that extends into the oxidation tank. A truss is fixed to the outside of the shaft tube, and an arc-shaped horizontally extending stirring plate is fixed to the outside of the truss. A slag collection cover is synchronously rotated and fitted on the outside of the shaft tube. A scraper is connected to the top opening side of the slag collection cover. A drive unit supporting the rotation of the shaft tube is installed at the top of the equipment platform, and the slag collection cover is connected to the separation cylinder along the sludge pit through the shaft tube.

[0020] The beneficial effects are as follows: 1. The present invention integrates the oxidation tank and the separation cylinder, and sets the separation cylinder horizontally below the oxidation tank. The sludge pit at the bottom of the oxidation tank is directly connected to the feed pipe of the separation cylinder, so that the oxidized dye precipitates into the filter press chamber. There is no need to configure additional auxiliary equipment such as sludge lifting pump and conveying pipeline, which avoids secondary mixing of precipitate with unseparated water and residual dye during the conveying process. The device has a compact layout and occupies a small area.

[0021] 2. The hydraulic cylinder drives the movable cover to move laterally, which, together with the elastic support of the spring on the back of the pressure plate, forms a filtering and squeezing action, and simultaneously completes the sedimentation and pressing of the filter cake and the water filtration action, reducing the moisture content of the filter cake and helping to reduce the energy consumption of subsequent drying.

[0022] 3. During the horizontal movement of the movable cover, the volume of the drainage cavity formed by the sleeve and the core tube continuously increases, creating a negative pressure suction effect. This helps the filter disc to quickly discharge water, and the water is discharged along the core tube and the return bend. The one-way valve prevents backflow and ensures the stability of the filtrate collection.

[0023] 4. After the filter press is completed, the screw drives the unloading disc to rotate and push it out of the receiving tank. Together with the pressure plate, it keeps the disc in a stationary position, which can quickly separate the filter cake from the surface of the pressure plate, avoid filter cake adhesion, eliminate the need for manual cleaning, and improve the efficiency of continuous operation.

[0024] 5. When the movable cover moves laterally to the end of the extrusion stroke, the balance frame disengages from the inner section of the stop frame. The stop frame automatically rotates to the inside of the constraint frame through the cooperation of the inner section, the outer expansion section and the blocking section, thereby achieving mechanical locking of the pressure plate, maintaining the spring in a compressed and stored state, ensuring the stability of the pressure plate position during the filter cake discharge process, and preventing the filter cake from scattering due to the spring accidentally resetting.

[0025] 6. When the movable cover is reset, the volume of the drainage cavity formed by the sleeve and the core tube is reduced, and the residual gas and water are discharged in the opposite direction along the filter plate, realizing automatic backwashing of the filter screen without manual disassembly and cleaning, avoiding filter screen blockage and extending the maintenance cycle. When the balance frame pushes the inner section of the anti-reverse frame, the locking state is released, and the compressed spring pushes the pressure plate to reset quickly, pushing the backwash water back to the filter screen to avoid water remaining in the filter chamber. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a left-side structural diagram of the present invention; Figure 4 This is a schematic diagram of the internal structure of the oxidation tank of the present invention; Figure 5 This is a schematic diagram of the internal structure of the oxidation tank of the present invention from another direction; Figure 6 This is a partial structural front view of the present invention; Figure 7 This is a partial top view of the structure of the present invention; Figure 8 This is a partial three-dimensional structural schematic diagram of the present invention; Figure 9 This is a partial structural breakdown diagram of the present invention; Figure 10 This is a structural breakdown diagram of the movable cover of the present invention; Figure 11 This is a three-dimensional structural diagram of the pressure plate of the present invention; Figure 12 This is a three-dimensional structural breakdown diagram of the pressure plate of the present invention; Figure 13 This is a partial structural schematic diagram of the ejector tray of the present invention; Figure 14 This is a three-dimensional structural diagram of the frame of the present invention; Figure 15 This is a three-dimensional schematic diagram of a partial structure of the present invention from another direction; Figure 16 This is a schematic diagram showing the partial structure of the present invention split in another direction; Figure 17 This is a front cross-sectional view of the filter press chamber in its initial state according to the present invention; Figure 18 This is a three-dimensional cross-sectional view of the filter press chamber in its initial state according to the present invention; Figure 19 This is a front cross-sectional view of the filter press chamber in its intermediate state according to the present invention; Figure 20 This is a three-dimensional structural cross-sectional view of the filter press chamber in its intermediate state according to the present invention; Figure 21 This is a front cross-sectional view of the filter press chamber in its final state according to the present invention; Figure 22 This is a three-dimensional structural cross-sectional view of the filter press chamber of the present invention in its final state.

[0028] The annotations in the attached figures are explained as follows: 1. Oxidation tank; 101. Sludge pit; 102. Equipment platform; 103. Shaft tube; 103a. Slag collection hood; 104. Truss; 105. Mixing blade; 106. Scraper; 107. Drive unit; 2. Separation cylinder; 201. Feed pipe; 202. Discharge hole; 203. Side tie rod; 3. Frame; 301. Rotating lug; 4. Movable cover; 401. Filter plate; 401a. Filter screen; 402. Sleeve; 403. Balance frame; 5. Pressure plate; 501. Support rod; 501a. Mounting flange; 502, spring; 503, constraint frame; 503a, slide groove; 503b, smooth rod; 504, transmission sleeve; 504a, transmission hole; 504b, gear; 505, slider; 506, rack; 507, receiving groove; 508, compression spring; 6, hydraulic cylinder; 7, sealing plate; 8, core tube; 9, anti-reverse frame; 901, inner retraction section; 902, outer expansion section; 903, blocking section; 10, unloading disc; 10a, screw; 10b, transmission bar; 11, return elbow. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0030] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0031] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] See Figures 1-22 As shown, the present invention provides a dye recovery and oxidation degradation device for dyeing and printing wastewater, including an oxidation tank 1 and a separation cylinder 2. The separation cylinder 2 is arranged horizontally below the oxidation tank 1. Inside the separation cylinder 2, there is a movable cover 4 and a pressure plate 5 that can be horizontally sealed and slid. A filter press chamber is formed between the pressure plate 5 and the movable cover 4 to accommodate the dye precipitate falling from the oxidation tank 1 and to provide a closed space for subsequent filter press separation. The filter press chamber is connected to the bottom of the oxidation tank 1. The movable cover 4 is connected to a core tube 8 on the side away from the pressure plate 5. A sealing plate 7 that can move horizontally with the movable cover 4 is provided on the top side of the movable cover 4 to simultaneously seal the feed pipe 201 during the squeezing process of the movable cover 4, cut off the precipitate input channel, and prevent new precipitate from being mixed in during filter press and affecting the separation effect. The top of the separation cylinder 2 is equipped with a feed pipe 201 that connects to the oxidation tank 1. The sealing plate 7 can move laterally to close the bottom of the feed pipe 201. The bottom of the separation cylinder 2 has a vertical discharge hole 202 that runs through it near the pressure plate 5. This is used to discharge the dye filter cake after extrusion and dehydration in a directional manner, thereby achieving centralized collection of the filter cake. The pressure plate 5 is fixed with a support rod 501 that extends through the separation cylinder 2 on the side corresponding to the discharge hole 202. The support rod 501 is fitted with a spring 502 on the outside of it, with both ends pressing against the inner end face of the pressure plate 5 and the separation cylinder 2, respectively. The compression stroke of the spring 502 is greater than the distance between the pressure plate 5 and the discharge hole 202, which is used to provide elastic support for the pressure plate 5. Together with the movable cover 4, it forms a bidirectional extrusion force. At the same time, after unlocking, it drives the pressure plate 5 to quickly reset, assisting in the backwashing of the filter screen 401a and the preparation for the next round of feeding.

[0034] As an optional implementation, a frame 3 is also included. The frame 3 is disposed outside the separating cylinder 2. A hydraulic cylinder 6 for supporting the transverse movement of the movable cover 4 is fixed on the outside of the frame 3. A side tie rod 203 longitudinally connected to the frame 3 is fixed on the outside of the separating cylinder 2. This arrangement strengthens the connection stability between the separating cylinder 2 and the frame 3 through the side tie rod 203, avoids displacement or deformation of the separating cylinder 2 during the extrusion process, ensures the accurate transverse movement trajectory of the movable cover 4, and improves the reliability of extrusion and sealing. A filter disc 401 is installed at the opening of the movable cover 4 near the pressure plate 5. The center of the filter disc 401 is a mesh filter screen 401a. The filter disc 401 and the pressure plate 5 work together to form a compression mechanism for compressing the precipitated material in the filter chamber. This mechanism is used to trap dye precipitate to form a filter cake during the compression process, while allowing water to pass through the filter screen 401a and be discharged, thus achieving solid-liquid separation. With this setup, the purity of dye recovery can be improved through the precise filtration of the filter screen 401a. Furthermore, the filter disc 401 moves synchronously with the movable cover 4 to ensure a stable filtration area during the compression process and improve separation efficiency. The outer side of the movable cover 4 is connected to a sleeve 402 that is fitted onto the outside of the core tube 8. The sleeve 402 and the core tube 8 are slidably sealed to form a retractable drainage cavity with the core tube 8, ensuring that the drainage channel is sealed and continuous during the lateral movement of the movable cover 4. The outer end of the sleeve 402 is fixed with a balance frame 403 that connects to the telescopic end of the hydraulic cylinder 6. There are two sets of hydraulic cylinders 6. With this arrangement, the driving force of the hydraulic cylinder 6 can be transmitted through the balance frame 403 to ensure that the movable cover 4 is subjected to balanced force and to avoid tilting and jamming during lateral movement. At the same time, it provides a trigger support point for the subsequent anti-reverse frame 9. The support rod 501 extends out of the separation cylinder 2 and is fixed with a mounting flange 501a. The support rod 501 is connected to a rectangular frame constraint frame 503 through the mounting flange 501a. The frame 3 is equipped with two sets of anti-reverse frames 9 symmetrically arranged on the front and rear sides of the separation cylinder 2. The anti-reverse frames 9 are rotatably connected to the frame 3 and are used to lock the position of the pressure plate 5 at the end of the extrusion stroke to keep the spring 502 in a compressed state and provide a stable environment for the filter cake to be discharged. This setting makes it easy to achieve automatic locking and unlocking through mechanical structure without manual intervention, thus improving the automation level of the equipment. The inner side of the frame 3 is fixed with a rotating ear 301 for mounting a retaining frame 9. Two sets of retaining frames 9 are pressed together by torsion springs mounted on the rotating ear 301 towards the side close to the separating cylinder 2. This is used to provide a continuous inward tightening force for the retaining frame 9, ensuring that the retaining frame 9 can quickly rotate to the locking position after the balance frame 403 is disengaged. The retaining frame 9 includes an inner section 901 that is rotatably connected to the rotating ear 301. An outwardly expanding section 902 is fixed at the outer end of the inner section 901, and the outer end of the outward expanding section 902 is bent inward to form a blocking section 903. The inner section 901 abuts against the outer side of the balance frame 403. When the balance frame 403 moves laterally to disengage from the inner section 901, the retaining frame 9 rotates to a position that fits against the outer wall of the separating cylinder 2. The blocking section 903 serves as a locking structure for limiting the constraint frame 503, preventing the spring 502 in the compressed state from resetting. This is used to accurately lock the end point of the compression of the pressure plate 5, preventing the pressure plate 5 from accidentally moving and causing the filter cake to scatter when the filter cake is discharged. A discharge plate 10 is provided on the side of the pressure plate 5 near the movable cover 4. A screw 10a is fixed in the middle of the discharge plate 10, which passes through the support rod 501 and extends into the constraint frame 503. The screw 10a is threadedly engaged with the inner wall of the support rod 501. It is used to convert the rotational motion of the transmission sleeve 504 into the axial pushing motion of the discharge plate 10, so as to realize the automatic release of the filter cake. A transversely extending transmission bar 10b is fixed at the outer end of the screw 10a. A transmission sleeve 504 is rotatably arranged in the constraint frame 503. The transmission sleeve 504 has a transmission hole 504a through its middle to accommodate the sliding insertion of the transmission bar 10b. The transmission hole 504a is adapted to the longitudinal section of the transmission bar 10b to maintain rotational synchronization. This ensures that when the transmission sleeve 504 rotates, it can drive the screw 10a to rotate synchronously through the transmission bar 10b, so as to realize the precise pushing action of the discharge plate 10.

[0035] The constraint frame 503 is provided with a sliding groove 503a on both the front and rear sides near the separation cylinder 2. A slider 505 that can abut against the support block 903 is longitudinally slidably fitted in the sliding groove 503a. A longitudinally extending rack 506 is fixed inside the slider 505. The two racks 506 are staggered vertically, and the end face of the transmission sleeve 504 is a gear 504b that meshes with the two sets of racks 506. Thus, the slider 505 is driven to move by the push of the anti-reverse frame 9 block 903, which in turn drives the rack 506 to mesh with the gear 504b to rotate, so that the material ejection action and the locking action are synchronized, without the need for an additional power source. A longitudinally penetrating rod 503b is installed inside the chute 503a, and the rod 503b is in clearance fit with the slider 505. A compression spring 508 is sleeved on the outside of the rod 503b. The compression spring 508 keeps the slider 505 pressed against the outside and provides a reset force for the slider 505 to ensure that the slider 505 can quickly return to its position after the anti-return frame 9 is unlocked, in preparation for the next round of locking and unloading. The end face of the pressure plate 5 is provided with a receiving groove 507 to accommodate the unloading plate 10, and the unloading plate 10 is flush with the end face of the pressure plate 5. The outer port of the core tube 8 is connected to a return bend 11 through a one-way valve. The outer port of the return bend 11 is connected to the oxidation tank 1 (not shown in the figure) through a return pipe. The oxidation tank 1 has a sludge pit 101 at the bottom connected to the feed pipe 201, and an equipment platform 102 is installed on the top of the oxidation tank 1. The bottom of the equipment platform 102 has a rotating shaft tube 103 that extends into the oxidation tank 1. A truss 104 is fixed to the outside of the shaft tube 103. An arc-shaped horizontally extending stirring plate 105 is fixed to the outside of the truss 104. A slag collection cover 103a is synchronously rotated and fitted on the outside of the shaft tube 103. A scraper plate 106 is connected to the top opening of the slag collection cover 103a. It is used to rotate and scrape off the scum on the surface of the oxidation tank 1 and collect it into the slag collection cover 103a to avoid the scum from mixing with the sediment and affecting the separation effect. A drive unit 107 is installed on the top of the equipment platform 102 to support the rotation of the shaft tube 103. The slag collection cover 103a is connected to the separation cylinder 2 through the shaft tube 103 along the sludge pit 101, thereby realizing the directional collection and transportation of sediment without the need for additional transportation equipment and avoiding sediment mixing and pipeline blockage.

[0036] Using the above structure, dyeing and printing wastewater is discharged into oxidation tank 1. Oxidizing agent and flocculant are added to oxidation tank 1 to oxidize the dye in the wastewater and form precipitate. After settling, the precipitate accumulates in sludge pit 101 and enters the filter press chamber in separation cylinder 2 through feed pipe 201. When it is necessary to discharge the precipitate, the following steps are followed: S1. Start hydraulic cylinder 6 to push movable cover 4 towards pressure plate 5 to compress the sediment in the filter chamber (see...). Figure 17 , 18 Simultaneously, the top side sealing plate 7 of the movable cover 4 moves laterally to gradually cover and seal the bottom opening of the feed pipe 201, cutting off the sedimentation input channel from the sludge pit 101 to the pressure filter chamber inside the separation cylinder 2 (see...). Figure 19 , 20 ); S2. As the movable cover 4 gradually moves laterally closer to the pressure plate 5, the sediment in the filter chamber is squeezed out and the water is filtered out. The water is discharged into the sleeve 402 along the filter plate 401 of the movable cover 4. As the volume of the drainage cavity formed by the core tube 8 and the sleeve 402 continues to increase, a negative pressure is formed, which helps the filter plate 401 to achieve suction and drainage. The water is guided to be discharged outward along the core tube 8 and the return bend 11 during the continuous squeezing process of the movable cover 4. The one-way valve ensures that the water discharged into the return bend 11 cannot flow back. At the same time, the pressure plate 5 is squeezed by the sediment in the filter chamber to counteract the elastic force of the spring 502 on the back side of the pressure plate 5. S3. The filter cake formed by sedimentation and compression on the pressure plate 5 continuously pushes and compresses the spring 502. During the process of the pressure plate 5 moving laterally under force to the discharge hole 202, the extrusion mechanism composed of the movable cover 4 and the pressure plate 5 continuously extrudes and drains the filter cake. When the pressure plate 5 and the movable cover 4 move laterally to positions located on both sides of the discharge hole 202, the extrusion stroke ends (see...). Figure 21 , 22 ); S4. Simultaneously, the balance frame 403 of the movable cover 4 moves laterally from the inner section 901 of the anti-reverse frame 9 to the outer expansion section 902. The balance frame 403 disengages from the inner section 901 to release the outward pushing and expanding effect of the balance frame 403 on the two sets of anti-reverse frames 9. At this time, the anti-reverse frame 9 retracts inward to the inner side of the constraint frame 503 outside the pressure plate 5, thereby locking the lateral position of the pressure plate 5 through the anti-reverse frame 9, that is, keeping the spring 502 in a compressed and stored state. S5. As the anti-retractor 9 retracts inward, the blocking section 903 pushes the slider 505 inside the constraint frame 503, thereby pushing the slider 505 along the slide groove 503a through the blocking section 903, which in turn drives the rack 506 to rotate the gear 504b. The gear 504b drives the transmission sleeve 504 and the transmission bar 10b passing through its inner side to rotate. The transmission bar 10b supports the screw 10a and the discharge disc 10 to rotate. Since the screw 10a is threadedly engaged with the support rod 501, the support screw 10a drives the discharge disc 10 to be pushed out of the receiving groove 507 to assist the filter cake to separate from the surface of the pressure plate 5. S6, after the movable cover 4 and the pressure plate 5 are moved horizontally above the discharge hole 202, the hydraulic cylinder 6 reverses to pull the movable cover 4 back to its original position. Since the retaining frame 9 supports and locks the pressure plate 5 in the spring 502's compressed position, and the discharge plate 10 rotates out from the surface of the stationary pressure plate 5, the filter cake can be supported to be discharged downward from the discharge hole 202. S7. During the horizontal repositioning process of the movable cover 4, the sleeve 402 is continuously sleeved on the outside of the core tube 8. The volume of the drainage cavity formed by the two gradually decreases. Some of the gas and water remaining on the side of the core tube 8 of the one-way valve are discharged in the reverse direction along the filter plate 401 to backwash the filter screen 401a. S8. When the balance frame 403 of the movable cover 4 moves laterally to push the inner section 901 of the backstop frame 9, it pushes the inner section 901 outward to keep the backstop frame 9 outward, thereby releasing the support and locking effect of the backstop frame 9 on the constraint frame 503. At this time, the spring 502 in the compressed and stored state pushes the pressure plate 5 to quickly reset, so as to flush the backwash water discharged into the filter chamber to the other side of the filter screen 401a. At the same time, the movable cover 4 drives the sealing plate 7 to move laterally to the position of pushing away the feed pipe 201. The bottom opening of the feed pipe 201 is opened, and the sediment in the sludge pit 101 can continue to be input into the filter chamber to repeat the next squeezing and discharging action.

[0037] By integrating the oxidation tank 1 and the separation cylinder 2, the separation cylinder 2 is horizontally positioned below the oxidation tank 1. The sludge pit 101 at the bottom of the oxidation tank 1 is directly connected to the feed pipe 201 of the separation cylinder 2, allowing the oxidized dye to precipitate into the filter press chamber. This eliminates the need for additional auxiliary equipment such as sludge lifting pumps and conveying pipelines, avoiding secondary mixing of precipitate with unseparated water and residual dye during the conveying process. The device has a compact layout and occupies a small area.

[0038] With the help of hydraulic cylinder 6, the movable cover 4 is moved laterally. Combined with the elastic support of spring 502 on the back side of pressure plate 5, a filtering and squeezing action is formed, and the sedimentation and filtration actions are completed simultaneously, reducing the moisture content of the filter cake and helping to reduce the energy consumption of subsequent drying. During the lateral movement of the movable cover 4, the volume of the drainage cavity formed by the sleeve 402 and the core tube 8 continuously increases, forming a negative pressure suction effect, which can assist the filter disc 401 to quickly discharge water. The water is discharged along the core tube 8 and the return bend 11, and the one-way valve prevents backflow, ensuring the stability of the filtrate collection. After the filter press is completed, the screw 10a drives the unloading disc 10 to rotate and push it out of the receiving tank 507. Together with the pressure plate 5, it keeps the filter cake in a stationary position, which can quickly separate the filter cake from the surface of the pressure plate 5, avoid filter cake adhesion, eliminate the need for manual cleaning, and improve the efficiency of continuous operation.

[0039] When the movable cover 4 moves laterally to the end of the extrusion stroke, the balance frame 403 disengages from the inner section 901 of the stop frame 9. The stop frame 9 automatically rotates to the inside of the constraint frame 503 through the cooperation of the inner section 901, the outer section 902 and the blocking section 903, thereby achieving mechanical locking of the pressure plate 5, maintaining the compressed and stored state of the spring 502, ensuring the stability of the pressure plate 5 during the filter cake discharge process, and preventing the spring 502 from accidentally resetting and causing the filter cake to scatter.

[0040] When the movable cover 4 is reset, the volume of the drainage cavity formed by the sleeve 402 and the core tube 8 is reduced, and the residual gas and water are discharged in reverse along the filter plate 401, realizing the automatic backwashing of the filter screen 401a without manual disassembly and cleaning, avoiding clogging of the filter screen 401a and extending the maintenance cycle. When the balance frame 403 pushes the inner section 901 of the backstop frame 9, the locking state is released, and the compressed spring 502 pushes the pressure plate 5 to quickly reset, pushing the backwash water back to the filter screen 401a, avoiding water remaining in the filter chamber.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A dye recovery, oxidation, and degradation device for dyeing and printing wastewater, characterized in that: It includes an oxidation tank (1) and a separation cylinder (2). The separation cylinder (2) is arranged horizontally below the oxidation tank (1). The separation cylinder (2) is provided with a movable cover (4) and a pressure plate (5) that can slide horizontally and seal. A filter press chamber is formed between the pressure plate (5) and the movable cover (4), and the filter press chamber is connected to the bottom of the oxidation tank (1). The movable cover (4) is connected to a core tube (8) on the side away from the pressure plate (5), and a sealing plate (7) that can move horizontally with the movable cover (4) is provided on the top side of the movable cover (4). The top of the separation cylinder (2) is provided with a feed pipe (201) that connects to the oxidation tank (1). The sealing plate (7) can move laterally to close the bottom of the feed pipe (201). The bottom of the separation cylinder (2) has a vertical discharge hole (202) that runs through it on the side near the pressure plate (5). The pressure plate (5) is fixed with a support rod (501) that passes through the separation cylinder (2) on the side corresponding to the discharge hole (202). The support rod (501) is fitted with a spring (502) with its two ends abutting against the inner end face of the pressure plate (5) and the separation cylinder (2) respectively. The compression stroke of the spring (502) is greater than the distance between the pressure plate (5) and the discharge hole (202).

2. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 1, characterized in that: It also includes a frame (3), which is located outside the separator (2). A hydraulic cylinder (6) for supporting the transverse movement of the movable cover (4) is fixed on the outside of the frame (3). A side tie rod (203) is longitudinally connected to the frame (3) on the outside of the separator (2).

3. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 2, characterized in that: A filter disc (401) is installed at the opening of the movable cover (4) near the pressure plate (5). The center of the filter disc (401) is a mesh filter (401a). The filter disc (401) and the pressure plate (5) cooperate to form a squeezing mechanism for compressing the sediment in the filter chamber.

4. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 3, characterized in that: The outer side of the movable cover (4) is connected to a sleeve (402) that is sleeved to the outside of the core tube (8). The sleeve (402) and the core tube (8) are slidably sealed. The outer end of the sleeve (402) is fixed with a balance frame (403) that connects to the telescopic end of the hydraulic cylinder (6).

5. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 4, characterized in that: The support rod (501) is fixed with a mounting flange (501a) at one end of the separation cylinder (2), and the support rod (501) is connected to a rectangular frame constraint frame (503) through the mounting flange (501a). The frame (3) is provided with two sets of anti-reverse frames (9) symmetrically arranged on the front and rear sides of the separation cylinder (2), and the anti-reverse frames (9) are rotatably connected to the frame (3).

6. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 5, characterized in that: The inner side of the frame (3) is fixed with a rotating ear (301) for installing a backstop (9). Two sets of backstops (9) are pressed together toward the side close to the separation cylinder (2). The backstop (9) includes an inner section (901) that is rotatably connected to the rotating ear (301). The outer end of the inner section (901) is fixed with an outwardly expanding section (902), and the outer end of the outward expanding section (902) is bent inward to form a blocking section (903). The inner section (901) abuts against the outside of the balance frame (403). When the balance frame (403) moves laterally to disengage from the inner section (901), the backstop (9) rotates to a position that fits against the outer wall of the separation cylinder (2). The blocking section (903) serves as a locking structure for the constraint frame (503) to prevent the spring (502) in the compressed state from resetting.

7. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 6, characterized in that: The pressure plate (5) is provided with a material ejector plate (10) on the side near the movable cover (4). A screw (10a) is fixed in the middle of the material ejector plate (10) through the support rod (501) and into the constraint frame (503). The screw (10a) is threaded with the inner wall of the support rod (501). A transversely extending transmission bar (10b) is fixed at the outer end of the screw (10a). A transmission sleeve (504) is rotatably provided in the constraint frame (503). A transmission hole (504a) is passed through the middle of the transmission sleeve (504) to accommodate the sliding insertion of the transmission bar (10b). The transmission hole (504a) is adapted to the longitudinal section of the transmission bar (10b) to maintain synchronous rotation.

8. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 7, characterized in that: The constraint frame (503) is provided with a sliding groove (503a) on both the front and rear sides near the separation cylinder (2). A slider (505) that can abut against the support block (903) is longitudinally slidably fitted in the sliding groove (503a). A longitudinally extending rack (506) is fixed inside the slider (505). The two racks (506) are staggered vertically, and the end face of the transmission sleeve (504) is a gear (504b) that meshes with the two sets of racks (506).

9. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 8, characterized in that: The slide groove (503a) is equipped with a longitudinally penetrating light rod (503b) that runs through the slider (505), and the light rod (503b) and the slider (505) are in clearance fit. A compression spring (508) is sleeved on the outside of the light rod (503b), and the compression spring (508) keeps the slider (505) pressed against the outside. The end face of the pressure plate (5) is provided with a receiving groove (507) for accommodating the ejector plate (10), and the ejector plate (10) is flush with the end face of the pressure plate (5). The outer port of the core tube (8) is connected to a return elbow (11) through a one-way valve.

10. The dye recovery and oxidation degradation device for dyeing and printing wastewater according to claim 1, characterized in that: The oxidation tank (1) is provided with a sludge pit (101) at the bottom, which is connected to the feed pipe (201). An equipment platform (102) is installed on the top of the oxidation tank (1). A shaft tube (103) is provided at the bottom of the equipment platform (102) and extends into the oxidation tank (1). A truss (104) is fixed on the outside of the shaft tube (103). An arc-shaped horizontally extending stirring plate (105) is fixed on the outside of the truss (104). A slag collection cover (103a) is synchronously rotated on the outside of the shaft tube (103). A scraper (106) is connected to the top opening side of the slag collection cover (103a). A drive unit (107) supporting the rotation of the shaft tube (103) is installed on the top of the equipment platform (102). The slag collection cover (103a) is connected to the separation cylinder (2) along the sludge pit (101) through the shaft tube (103).

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