A printing wastewater pretreatment device

Abstract

The utility model relates to sewage treatment technical field especially is related to a printing wastewater pretreatment device. The device includes cyclone flocculation pool and guide mechanism, guide mechanism includes backflushing runner, backflushing runner is connected in cyclone flocculation pool, the export direction of backflushing runner is set along the inner wall tangential of cyclone flocculation pool, and the direction of orientation is opposite with the cyclone flocculation pool in sewage cyclone direction. The printing wastewater pretreatment device provided by the utility model sets up the export direction of backflushing runner as opposite with the cyclone flocculation pool in sewage cyclone direction in micro flocculation body formation stage, so that the sewage of backflushing runner output collides with the cyclone sewage in cyclone flocculation pool, and the disturbance and turbulence of impact produce and destroy the movement path of big particle and small particle in cyclone sewage, thereby solve the problem that the distribution range of ink particle and pigment particle size in printing sewage is wide, and the collision frequency between particles is low in cyclone flocculation process.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a pretreatment device for printing wastewater. Background Technology

[0002] Swirl coagulation is a highly efficient water treatment technology that integrates fluid dynamics enhancement and chemical coagulation principles. It is widely used in the field of wastewater treatment. Swirl coagulation guides wastewater to form a high-speed rotating vortex or spiral flow pattern inside, which significantly enhances the collision frequency and aggregation efficiency of particulate matter in the wastewater under the action of centrifugal force. At the same time, the shear force and turbulence effect generated by the wastewater during rotation help the flocculant to disperse and distribute rapidly and evenly, promoting the efficient destabilization of pollutants.

[0003] In practical applications, it has been found that suspended particles of different sizes exhibit significant differences in motion behavior in swirling flow fields. Small particles, due to their smaller mass and inertia, are easily affected by the random collisions of surrounding fluid molecules, exhibiting Brownian motion. Larger particles, on the other hand, due to their larger mass and inertia, are more sensitive to changes in external flow field conditions, especially the effect of water flow shear force. Because of the difference in motion behavior between small and large particles, the frequency of spatial encounters between the two is relatively low.

[0004] Especially when treating printing wastewater, the wide distribution range of ink particles and pigments in the wastewater leads to a low collision frequency between particles during the swirling flocculation process, thus affecting the flocculation effect. Utility Model Content

[0005] This invention provides a pretreatment device for printing wastewater to solve the problem that the wide distribution range of ink particles and pigments in printing wastewater leads to a low collision frequency between particles during the vortex flocculation process, thus affecting the flocculation effect.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: A pretreatment device for printing wastewater: It includes a swirl flocculation tank and a flow guiding mechanism; the flow guiding mechanism includes a backflushing channel; the backflushing channel is connected to the swirl flocculation tank; the outlet direction of the backflushing channel is tangentially arranged along the inner wall of the swirl flocculation tank and is opposite to the direction of the sewage swirl in the swirl flocculation tank, which is used to introduce sewage into the swirl flocculation tank during the micro-flocculation stage to disturb the swirl in the swirl flocculation tank, thereby increasing the collision frequency between particles in the sewage.

[0007] Furthermore, the flow guiding mechanism also includes a co-flow channel; the co-flow channel is connected to the vortex flocculation tank; the outlet direction of the co-flow channel is tangentially arranged along the inner wall of the vortex flocculation tank, and its orientation is the same as the vortex swirling direction of the sewage in the vortex flocculation tank, which is used to guide sewage into the vortex flocculation tank during the floc growth stage, so as to accelerate the vortex flow velocity at the outlet of the co-flow channel, thereby increasing the collision frequency between particles in the sewage.

[0008] Furthermore, it also includes an inlet switch valve and a blocking drive mechanism; the flow guiding mechanism also includes an inlet channel; the backflushing channel and the cooperating channel are both connected to the inlet channel; the inlet switch valve is disposed in the inlet channel and is used to control the opening and closing of the inlet channel; the blocking drive mechanism is disposed in the backflushing channel and is used to control the opening and closing of the backflushing channel and drive the sewage to flow along the backflushing channel.

[0009] Furthermore, the diversion mechanism also includes a transfer tank; the transfer tank has three interfaces, which are respectively connected to the backflushing channel, the cooperating channel and the liquid inlet channel, so as to buffer and divert the sewage entering the transfer tank.

[0010] Furthermore, the blocking drive mechanism includes a blocking structure and a conveying structure; the blocking structure includes a blocking valve body and a blocking insert; the blocking insert is slidably inserted into the blocking valve body and can move vertically to open or close the cooperative flow channel; the conveying structure includes a guide tube and a conveying paddle; the guide tube is connected to the blocking valve body; the conveying paddle is rotatably installed inside the guide tube and can rotate around its own axis to drive the sewage flow.

[0011] Furthermore, the blocking drive mechanism also includes a drive structure; the drive structure includes a support plate, a drive motor, and transmission components; the support plate is mounted on the guide tube; The drive motor is mounted on the support plate, and its rotating shaft is connected to the conveyor paddle through the transmission component, so as to drive the conveyor paddle to rotate around its own axis.

[0012] Furthermore, the drive structure also includes a clutch, a lifting gear, and a lifting rack; One end of the clutch is connected to the rotating shaft of the drive motor, and the other end is connected to the lifting gear, which is used to drive the lifting gear to rotate around its own axis; the lifting rack is connected to the blocking plate and meshes with the lifting gear to drive the blocking plate to move in the vertical direction.

[0013] Furthermore, the drive structure also includes a pull-out electromagnet; a limit groove is formed on the surface of the lifting rack; the pull-out electromagnet is mounted on the support plate, and its telescopic end is slidably inserted into the limit groove to lock the lifting rack.

[0014] Furthermore, it also includes two filtration mechanisms; the two filtration mechanisms are respectively disposed in the backwash channel and the co-flow channel, and are located between the transfer tank and the blocking drive mechanism; the filtration mechanism includes a filter screen; the two filter screens are respectively disposed in the backwash channel and the co-flow channel, and are used to intercept and separate flocs in the sewage.

[0015] Furthermore, the filtration mechanism also includes a telescopic push rod; the filter screen is hinged to the backwash channel; one end of the telescopic push rod is hinged to the backwash channel or the cooperating channel, and the other end is hinged to the filter screen, for driving the filter screen to rotate, so as to insert or withdraw the filter screen into the backwash channel or the cooperating channel.

[0016] The beneficial effects of the printing wastewater pretreatment device in this utility model are analyzed as follows: The device includes a swirl flocculation tank and a flow guiding mechanism; the flow guiding mechanism includes a backflushing channel; the backflushing channel is connected to the swirl flocculation tank; the outlet direction of the backflushing channel is tangentially arranged along the inner wall of the swirl flocculation tank and is opposite to the direction of the sewage swirl in the swirl flocculation tank, which is used to introduce sewage into the swirl flocculation tank during the micro-flocculation stage to disturb the swirl in the swirl flocculation tank, thereby increasing the collision frequency between particles in the sewage.

[0017] The printing wastewater pretreatment device provided by this utility model solves the problem of low collision frequency between particles during the swirl flocculation process by setting the outlet direction of the backwash channel to be opposite to the swirling direction of the wastewater in the swirl flocculation tank during the micro-flocculation stage. This causes the wastewater output from the backwash channel to impact the swirling wastewater in the swirl flocculation tank. The disturbance and turbulence generated by the impact disrupt the movement paths of large and small particles in the swirling wastewater. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the printing wastewater pretreatment device provided in this embodiment of the utility model; Figure 2Top view of the printing wastewater pretreatment device provided in this embodiment of the utility model; Figure 3 A schematic diagram of the blocking drive mechanism provided in this embodiment of the utility model; Figure 4 Right view of the blocking drive mechanism provided in this embodiment of the utility model; Figure 5 Rear view of the blocking drive mechanism provided in this embodiment of the utility model; Figure 6 This utility model provides a schematic diagram of the filtration mechanism.

[0020] icon: 100-Swirl flocculation tank; 200-Flow guiding mechanism; 210-Backwash channel; 220-Cooperating channel; 230-Inlet channel; 240-Transfer tank; 300-Inlet switch valve; 400-Blocking drive mechanism; 410-Blocking structure; 411-Blocking valve body; 412-Blocking insert plate; 420-Conveying structure; 421-Flow guiding cylinder; 422-Conveying paddle; 430-Drive structure; 431-Bearing plate; 432-Drive motor; 433-Transmission component; 434-Clutch; 435-Lifting gear; 436-Lifting rack; 437-Pull-out electromagnet; 500-Filtering mechanism; 510-Filter screen; 520-Telescopic push rod. Detailed Implementation

[0021] Because the particle size distribution of ink particles and pigments in printing wastewater is relatively wide, the collision frequency between particles is low during the swirling flocculation process, which affects the flocculation effect.

[0022] In view of this, this solution provides a pretreatment device for printing wastewater, including a cyclone flocculation tank 100 and a flow guiding mechanism 200.

[0023] The following combination Figures 1-6 The structure and shape of the printing wastewater pretreatment device are described in detail: The flow guiding mechanism 200 includes a backwash channel 210; the backwash channel 210 is connected to the vortex flocculation tank 100; the outlet direction of the backwash channel 210 is tangentially arranged along the inner wall of the vortex flocculation tank 100, and its orientation is opposite to the direction of the sewage vortex in the vortex flocculation tank 100, which is used to introduce sewage into the vortex flocculation tank 100 during the micro-flocculation formation stage, so as to disturb the vortex in the vortex flocculation tank 100 and thereby increase the collision frequency between particles in the sewage.

[0024] In this embodiment, by setting the outlet orientation of the backwash channel 210 to be opposite to the swirling direction of the sewage in the swirl flocculation tank 100, the sewage output from the backwash channel 210 impacts the swirling sewage in the swirl flocculation tank 100. The disturbance and turbulence generated by the impact disrupt the movement paths of large and small particles in the swirling sewage, thereby increasing the collision frequency between particles in the sewage.

[0025] In addition, by controlling the sewage to enter the vortex flocculation tank 100 through the backwash channel 210 during the micro-flocculation formation stage, the collision frequency between particles in the sewage is increased, thereby increasing the number of micro-flocculations in the sewage, thus providing growth nuclei for subsequent particle aggregation. At the same time, the reason for controlling the sewage entry time during the micro-flocculation formation stage is to avoid the disturbance and turbulence generated by the impact from destroying the aggregated macro-flocculations and affecting subsequent sedimentation.

[0026] To increase the collision frequency between particles in wastewater without damaging macroflocs: like Figures 1-2 As shown, the flow guiding mechanism 200 also includes a coordinating flow channel 220; the coordinating flow channel 220 is connected to the vortex flocculation tank 100; the outlet direction of the coordinating flow channel 220 is tangentially arranged along the inner wall of the vortex flocculation tank 100, and its orientation is the same as the vortex flow direction of the sewage in the vortex flocculation tank 100, which is used to guide the sewage into the vortex flocculation tank 100 during the floc growth stage, so as to accelerate the vortex flow velocity at the outlet of the coordinating flow channel 220, thereby increasing the collision frequency between particles in the sewage.

[0027] In this embodiment, when the sewage in the cyclone flocculation tank 100 enters the floc growth stage, the outlet orientation of the cooperating flow channel 220 is set to be the same as the cyclone direction of the sewage in the cyclone flocculation tank 100, so that the sewage output from the cooperating flow channel 220 enters the cyclone flocculation tank 100 along the sewage cyclone direction, thereby accelerating the cyclone velocity at the outlet of the cooperating flow channel 220, so that the particles in the sewage collide in the same direction due to the velocity difference, thereby increasing the collision frequency between the particles in the sewage.

[0028] By setting the sewage input into the vortex flocculation tank 100 through the coordinating flow channel 220 to a tangential inflow, radial impact or violent disturbance generated during the sewage entry process is avoided, thereby reducing the impact on the flocs during the sewage entry process; at the same time, the outlet direction of the coordinating flow channel 220 is set tangentially along the inner wall of the vortex flocculation tank 100 so that the acceleration area of ​​the sewage vortex is concentrated at the outer edge, thereby enabling the sewage in the vortex flocculation tank 100 to form a stable vortex structure.

[0029] In addition, the reason for controlling the sewage entry time to the floc growth stage is that the micro-flocs in the floc growth stage have a certain strength and can withstand the moderate shearing generated by the sewage entering through the co-flow channel 220, so as to avoid the flocs being damaged. At the same time, the acceleration zone formed by the sewage entering through the co-flow channel 220 at the outer edge of the vortex can repeatedly impact the flocs, thereby making the structure of the flocs more compact and thus improving the floc strength.

[0030] To enable wastewater to enter the cyclone flocculation tank 100 through the backwash channel 210 and the cooperating channel 220: like Figures 1-2 As shown, it also includes an inlet switch valve 300 and a blocking drive mechanism 400; the flow guiding mechanism 200 also includes an inlet flow channel 230; the backflushing flow channel 210 and the cooperating flow channel 220 are both connected to the inlet flow channel 230; the inlet switch valve 300 is disposed in the inlet flow channel 230 and is used to control the opening and closing of the inlet flow channel 230; the blocking drive mechanism 400 is disposed in the backflushing flow channel 210 and is used to control the opening and closing of the backflushing flow channel 210 and drive the sewage to flow along the backflushing flow channel 210.

[0031] To prevent the accumulation of particulate matter in the wastewater at the junction of the backwash channel 210, the cooperating channel 220, and the inlet channel 230: like Figures 1-2 As shown, the diversion mechanism 200 also includes a transfer tank 240; the transfer tank 240 has three interfaces, which are respectively connected to the backflushing channel 210, the cooperating channel 220 and the liquid inlet channel 230, so as to buffer and divert the sewage entering the transfer tank 240.

[0032] In this embodiment, the inlet switch valve 300 controls the inlet flow channel 230 to be connected, while the blocking drive mechanism 400 controls the backwash flow channel 210 to be closed, so that the sewage enters the vortex flocculation tank 100 in sequence through the inlet flow channel 230, the transfer tank 240 and the inlet flow channel 230. During this process, because the outlet direction of the cooperating flow channel 220 is tangentially set along the inner wall of the vortex flocculation tank 100 and the orientation is the same as the vortex swirling direction of the sewage in the vortex flocculation tank 100, the sewage is transmitted to the preset vortex direction during the process of entering the vortex flocculation tank 100, thereby assisting the sewage in the vortex flocculation tank 100 to form a vortex.

[0033] During the micro-floc formation stage, the inlet switch valve 300 controls the inlet flow channel 230 to close, while the blocking drive mechanism 400 controls the backwash flow channel 210 to connect. Then, the blocking drive mechanism 400 drives the sewage to enter the vortex flocculation tank 100 in sequence through the cooperating flow channel 220, the transfer tank 240 and the backwash flow channel 210.

[0034] During the floc growth stage, the inlet switch valve 300 controls the inlet flow channel 230 to close, while the blocking drive mechanism 400 controls the backwash flow channel 210 to connect. Then, the blocking drive mechanism 400 drives the sewage to enter the vortex flocculation tank 100 in sequence through the cooperating flow channel 220, the transfer tank 240 and the backwash flow channel 210.

[0035] In the above process, since the volume of the transfer tank 240 is greater than the sewage input volume of the backwash channel 210, the co-flow channel 220 and the liquid inlet channel 230, the sewage first enters the transfer tank 240 and then flows to the backwash channel 210 or the co-flow channel 220, thereby avoiding the accumulation of particulate matter in the sewage at the connection of the backwash channel 210, the co-flow channel 220 and the liquid inlet channel 230.

[0036] In order to simultaneously control the opening and closing of the backflow channel 210 by the blocking drive mechanism 400 and drive the sewage flow: like Figures 3-5 As shown, the blocking drive mechanism 400 includes a blocking structure 410 and a conveying structure 420; the blocking structure 410 includes a blocking valve body 411 and a blocking insert plate 412; the blocking insert plate 412 is slidably inserted into the blocking valve body 411 and can move in the vertical direction to open or close the cooperating flow channel 220; the conveying structure 420 includes a guide tube 421 and a conveying paddle 422; the guide tube 421 is connected to the blocking valve body 411; the conveying paddle 422 is rotatably installed in the guide tube 421 and can rotate around its own axis to drive the sewage flow.

[0037] To drive the conveyor paddle 422 to rotate about its own axis: like Figures 3-5 As shown, the blocking drive mechanism 400 also includes a drive structure 430; the drive structure 430 includes a support plate 431, a drive motor 432 and a transmission component 433; the support plate 431 is mounted on the guide tube 421; the drive motor 432 is mounted on the support plate 431, and its rotation shaft is connected to the conveyor paddle 422 through the transmission component 433, for driving the conveyor paddle 422 to rotate around its own axis.

[0038] In order to drive the blocking plate 412 to move vertically: like Figures 3-5 As shown, the drive structure 430 also includes a clutch 434, a lifting gear 435, and a lifting rack 436; one end of the clutch 434 is connected to the rotating shaft of the drive motor 432, and the other end is connected to the lifting gear 435, which is used to drive the lifting gear 435 to rotate around its own axis; the lifting rack 436 is connected to the blocking plate 412 and meshes with the lifting gear 435 to drive the blocking plate 412 to move in the vertical direction.

[0039] To lock the blocking plate 412: like Figure 5As shown, the drive structure 430 also includes a pull-out electromagnet 437; a limit groove is formed on the surface of the lifting rack 436; the pull-out electromagnet 437 is installed on the support plate 431, and its telescopic end is slidably inserted into the limit groove to lock the lifting rack 436.

[0040] In this embodiment, when it is necessary to control the backflow channel 210 to be connected, the clutch 434 connects the rotating shaft of the drive motor 432 to the lifting gear 435. The drive motor 432 drives the lifting gear 435 to rotate around its own axis through the clutch 434. The lifting gear 435 drives the lifting rack 436 to move vertically upward through meshing. The lifting rack 436 drives the blocking plate 412 to move upward so that the blocking valve body 411 opens. After the lifting rack 436 moves to the set height, the telescopic end of the electromagnet 437 is pulled out and inserted into the limiting groove to lock the lifting rack 436. When it is necessary to control the backflow channel 210 to be disconnected, the above steps are repeated in reverse.

[0041] When it is necessary to drive the flow of sewage, the clutch 434 disconnects the rotating shaft of the drive motor 432 from the lifting gear 435. Then, the drive motor 432 drives the conveying paddle 422 to rotate around its own axis through the transmission component 433. The type of the transmission component 433 includes, but is not limited to, a combination of belts and pulleys. The conveying paddle 422 drives the flow of sewage. During this process, the flow direction of sewage can be changed by adjusting the rotation direction of the drive motor 432.

[0042] To prevent the flocs from being broken up by the conveyor paddle 422: like Figure 1 and Figure 6 As shown, it also includes two filtration mechanisms 500; the two filtration mechanisms 500 are respectively disposed in the backwash channel 210 and the co-flow channel 220, and are located between the transfer tank 240 and the blocking drive mechanism 400; the filtration mechanism 500 includes a filter screen 510; the two filter screens 510 are respectively disposed in the backwash channel 210 and the co-flow channel 220, and are used to intercept and separate flocs in the sewage.

[0043] To facilitate the cleaning of particles adhering to the surface of filter screen 510: like Figure 6 As shown, the filtration mechanism 500 also includes a telescopic push rod 520; the filter screen 510 is hinged to the backwash channel 210; one end of the telescopic push rod 520 is hinged to the backwash channel 210 or the cooperating channel 220, and the other end is hinged to the filter screen 510, for driving the filter screen 510 to rotate, so as to insert or pull the filter screen 510 into or out of the backwash channel 210 or the cooperating channel 220.

[0044] In this embodiment, when the sewage in the cyclone flocculation tank 100 enters the backwash channel 210 or the co-flow channel 220, the sewage enters the backwash channel 210 or the co-flow channel 220 through the filter screen 510. During this process, the flocs in the sewage are separated by the filter screen 510 to prevent the flocs from being broken as they follow the sewage through the conveying paddle 422.

[0045] After flocculation is completed, the telescopic push rod 520 extends and drives the filter screen 510 to rotate. The side of the filter screen 510 facing the vortex flocculation tank 100 is separated from the backwash channel 210 or the cooperating channel 220. Then, the personnel separate the flocs adhering to the filter screen 510.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pretreatment device for printing wastewater, characterized in that: Includes a cyclone flocculation tank (100) and a flow guiding mechanism (200); The flow guiding mechanism (200) includes a backflow channel (210). The backwash channel (210) is connected to the vortex flocculation tank (100). The outlet direction of the backwash channel (210) is tangentially arranged along the inner wall of the vortex flocculation tank (100) and is oriented opposite to the swirling direction of the sewage in the vortex flocculation tank (100). It is used to introduce sewage into the vortex flocculation tank (100) during the micro-flocculation formation stage to disturb the swirling flow in the vortex flocculation tank (100) and thereby increase the collision frequency between particles in the sewage.

2. The printing wastewater pretreatment device according to claim 1, characterized in that: The flow guiding mechanism (200) also includes a cooperating flow channel (220); The co-flow channel (220) is connected to the vortex flocculation tank (100); The outlet direction of the co-flow channel (220) is tangentially arranged along the inner wall of the vortex flocculation tank (100), and its orientation is the same as the vortex swirling direction of the sewage in the vortex flocculation tank (100). It is used to guide sewage into the vortex flocculation tank (100) during the floc growth stage, so as to accelerate the swirling flow velocity at the outlet of the co-flow channel (220) and thereby increase the collision frequency between particles in the sewage.

3. The printing wastewater pretreatment device according to claim 2, characterized in that: It also includes an inlet switch valve (300) and a blocking drive mechanism (400). The flow guiding mechanism (200) also includes a liquid inlet channel (230); Both the backwash channel (210) and the cooperative channel (220) are connected to the liquid inlet channel (230); The liquid inlet switch valve (300) is disposed in the liquid inlet channel (230) and is used to control the opening and closing of the liquid inlet channel (230); The blocking drive mechanism (400) is disposed in the backwash channel (210) to control the opening and closing of the backwash channel (210) and drive the sewage to flow along the backwash channel (210).

4. The printing wastewater pretreatment device according to claim 3, characterized in that: The flow guiding mechanism (200) also includes a transfer pool (240). The transfer tank (240) has three interfaces, which are respectively connected to the backwash channel (210), the cooperating channel (220) and the inlet channel (230) to buffer and divert the sewage entering the transfer tank (240).

5. The printing wastewater pretreatment device according to claim 4, characterized in that: The blocking drive mechanism (400) includes a blocking structure (410) and a conveying structure (420). The blocking structure (410) includes a blocking valve body (411) and a blocking insert plate (412). The blocking insert (412) is slidably inserted into the blocking valve body (411) and can move in the vertical direction to open or close the cooperative flow channel (220). The conveying structure (420) includes a guide tube (421) and a conveying paddle (422). The flow guide tube (421) is connected to the blocking valve body (411). The conveying paddle (422) is rotatably installed inside the guide tube (421) and can rotate around its own axis to drive the flow of sewage.

6. The printing wastewater pretreatment device according to claim 5, characterized in that: The blocking drive mechanism (400) also includes a drive structure (430). The drive structure (430) includes a support plate (431), a drive motor (432), and a transmission component (433). The support plate (431) is installed on the guide tube (421); The drive motor (432) is mounted on the support plate (431), and its rotation shaft is connected to the conveyor paddle (422) through the transmission component (433) to drive the conveyor paddle (422) to rotate around its own axis.

7. The printing wastewater pretreatment device according to claim 6, characterized in that: The drive structure (430) also includes a clutch (434), a lifting gear (435), and a lifting rack (436). One end of the clutch (434) is connected to the rotating shaft of the drive motor (432), and the other end is connected to the lifting gear (435), which is used to drive the lifting gear (435) to rotate around its own axis; The lifting rack (436) is connected to the blocking plate (412) and meshes with the lifting gear (435) to drive the blocking plate (412) to move in the vertical direction.

8. The printing wastewater pretreatment device according to claim 7, characterized in that: The drive structure (430) also includes a pull-out electromagnet (437). The surface of the lifting rack (436) is provided with a limiting groove; The pull-out electromagnet (437) is installed on the support plate (431), and its telescopic end is slidably inserted into the limiting groove to lock the lifting rack (436).

9. The printing wastewater pretreatment device according to claim 8, characterized in that: It also includes two filtration mechanisms (500); The two filtering mechanisms (500) are respectively disposed in the backwash channel (210) and the cooperative channel (220), and are located between the transfer pool (240) and the blocking drive mechanism (400); The filtration mechanism (500) includes a filter screen (510); The two filters (510) are respectively disposed in the backwash channel (210) and the cooperating channel (220) for intercepting and separating flocs in the sewage.

10. The printing wastewater pretreatment device according to claim 9, characterized in that: The filtration mechanism (500) also includes a telescopic push rod (520); The filter screen (510) is hinged to the backwash channel (210). One end of the telescopic push rod (520) is hinged to the backwash channel (210) or the cooperating channel (220), and the other end is hinged to the filter screen (510), which is used to drive the filter screen (510) to rotate so as to insert or pull the filter screen (510) into or out of the backwash channel (210) or the cooperating channel (220).

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