Sewage pretreatment coagulation reaction device

Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a sewage pretreatment coagulation reaction device which comprises a sewage pool, a supporting rod, a filter screen and a drainage rod, the interior of the supporting rod is hollow, the two ends of the supporting rod penetrate through the side walls of the sewage pool on the corresponding sides and extend outwards, the filter screen comprises a fixed end and a rolling end, the fixed end is connected with the supporting rod, and the rolling end is connected with the drainage rod. The rolling end can be rolled in the direction close to the fixed end, so that the filter screen has a flattened state and a rolled state, the multiple drainage rods are installed on the filter screen from the fixed end to the rolling end, the interior of each drainage rod is hollow and is communicated with the interior of the supporting rod, and a plurality of through holes are formed in the outer side of each drainage rod in the axial direction; according to the sewage treatment device, impurities in the sewage pool can be fished, residual sewage in the impurities can be squeezed out, in addition, a flocculating agent can be uniformly added to different positions in the sewage pool, uniform mixing of the flocculating agent and the sewage is guaranteed, and then the flocculation effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a sewage pretreatment coagulation reaction device. Background Art

[0002] Sewage treatment equipment is an industrial equipment that can effectively treat urban domestic sewage, industrial sewage, etc., and prevent sewage and pollutants from directly flowing into waters. It is of great significance to improving the ecological environment, enhancing the quality of cities and promoting economic development. Most related technologies use coagulation and sedimentation to treat sewage. The principle is to add chemical flocculants to destroy the stability of suspended particles, causing them to aggregate into flocs, and then settle to the bottom of the water under the action of gravity to achieve solid-liquid separation.

[0003] The patent document with the announcement number CN111153480B discloses a chemical wastewater treatment device, including a box body, the side of the box body is provided with a clear liquid discharge outlet and a dirt discharge outlet arranged in parallel up and down, a flocculant spreading box is set on the top of the box body, the flocculant spreading box is circular, and the bottom of the flocculant spreading box is provided with a plurality of discharge holes distributed at equal angles around the center of the box bottom, a turntable close to the bottom of the box is installed inside the flocculant spreading box, and the turntable is provided with a plurality of rows of circular holes distributed at equal angles around the center of the turntable, and the number of the circular holes is equal to the number of the discharge holes, and the flocculant spreading box is provided with a plurality of rows of circular holes distributed at equal angles around the center of the turntable, and the number of the circular holes is equal to the number of the discharge holes, and the flocculant spreading box is provided with a plurality of rows of circular holes distributed at equal angles around the center of the turntable, and the number of the circular holes is equal to the number of the discharge holes, and the number of the discharge ... A motor for driving a turntable to rotate is provided on the top of the spreading box. Driven by the motor, the turntable can dock or misalign multiple rows of round holes with multiple discharge holes at the bottom of the flocculant spreading box, control the opening and closing of the discharge holes, and put the flocculant inside the flocculant spreading box into the box in an intermittent, uniform and dispersed manner to react with the sewage, thereby improving the treatment effect of the flocculant. In addition, an agitator is also installed in the box, which includes a stirring shaft and a stirring paddle. The stirring paddle is spirally shaped and is mounted on the stirring shaft. The flocculant and sewage are fully mixed through the rotation of the stirring shaft.

[0004] However, when adding flocculants into the tank, the treatment device in the above patent document still spreads the flocculants on the surface of the sewage and then relies on the agitator to stir it. Although this can increase the mixing speed of the flocculant and sewage, the sewage pool is generally large, and it still takes a long time to fully mix the flocculant and sewage. In addition, the sewage may contain some impurities. These solid impurities may interfere with the formation and sedimentation process of the flocculent, making it difficult for the flocculant to be effectively distributed in the water, thereby affecting the treatment efficiency. Therefore, before coagulation and sedimentation, the impurities need to be salvaged. At this time, if an agitator is provided in the tank, it may affect the salvage effect of the impurities. Summary of the invention

[0005] The present invention provides a sewage pretreatment coagulation reaction device, aiming to solve the problem in the related art that the sewage pool is generally large, and although the mixing speed of flocculant and sewage can be increased by using an agitator, it still takes a long time. In addition, before coagulation and sedimentation, impurities in the sewage need to be salvaged. At this time, if an agitator is installed in the sewage pool, the salvage effect may be affected.

[0006] A sewage pretreatment coagulation reaction device of the present invention comprises a sewage pool, wherein the sewage pool is provided with an inlet pipe and an outlet pipe, and further comprises: A support rod is arranged along the width direction of the sewage pool. The interior of the support rod is hollow, and both ends of the support rod respectively penetrate the side walls of the sewage pool on the corresponding sides and extend outward. A driving member is provided on the sewage pool, which can drive the support rod to rotate around its own axis; The filter screen includes a fixed end and a reeling end, the fixed end is connected to the support rod, and the reeling end can be reeled in a direction close to the fixed end, so that the filter screen has a flattened state and a reeled state. When in the flattened state, the reeling end can contact the bottom of the sewage pool and make the filter screen tilted; A plurality of drainage rods are installed on the filter screen at intervals from the fixed end to the reeling end. The interior of each drainage rod is hollow and communicates with the interior of the support rod. A plurality of through holes are arranged axially on the outer side of the drainage rod. A first driving assembly capable of driving the support rod to move along the length direction of the sewage tank; The second driving assembly can drive the filter to switch between a flattened state and a rolled-up state.

[0007] The impurities in the sewage pool can be filtered by moving the filter and retained on one side of the filter. Then, the sewage remaining in the impurities can be squeezed out by rolling up the filter. The impurities on the filter can be cleaned by rotating the filter. Finally, the flocculant solution can be evenly discharged to different positions in the sewage pool.

[0008] Preferably, a connecting rod is also installed on the filter screen, and the connecting rod is arranged perpendicular to the axial direction of the drainage rod. One end of the connecting rod extends into the support rod and communicates with the interior of the support rod, and the other end of the connecting rod passes through multiple drainage rods in sequence and communicates with the interior of the drainage rod.

[0009] By arranging the connecting rod, the flocculant solution added to the inside of the supporting rod can gradually flow into the inside of the plurality of drainage rods through the connecting rod, and be discharged into the sewage pool through the through hole.

[0010] Preferably, the connecting rod is made of elastic material, so that when the filter screen is rolled up, the connecting rod can be rolled up synchronously with the filter screen.

[0011] Avoid the connecting rod from hindering the reeling of the filter.

[0012] Preferably, a slide groove is provided on the side wall of the sewage pool along its length direction, and the first driving assembly includes a motor, a screw and a slider, the motor is arranged on the sewage pool, the screw is arranged in the slide groove along the length direction of the sewage pool, the output end of the motor is connected to the screw, the slider is slidably arranged in the slide groove and cooperates with the screw thread, and the two ends of the support rod respectively pass through the slider on the corresponding side and are rotatably connected to the slider.

[0013] Preferably, the second driving assembly includes a sliding rod and a driving roller, the sliding rod is arranged at an inclination relative to the height direction of the sewage pool, one end of the sliding rod is connected to the support rod, and the other end extends into the sewage pool and contacts the bottom of the sewage pool, the driving roller is arranged along the width direction of the sewage pool and connected to the winding end of the filter screen, and the driving roller can wind up the filter screen upward or flatten the filter screen downward along the length direction of the sliding rod.

[0014] Preferably, a telescopic rod is provided between the slide rod and the driving roller, one end of the telescopic rod is rotatably sleeved on the outside of the driving roller, and the other end slides with the slide rod along the length direction of the slide rod, so that the length of the telescopic rod can be adapted according to the distance between the slide rod and the driving roller.

[0015] By providing a telescopic rod, during the winding process, the length of the telescopic rod can be adapted according to the distance between the slide bar and the driving roller, thereby ensuring the winding effect.

[0016] Preferably, when the filter is in a flattened state, the slide rod can close the two ends of the drain rod, so that the two ends of the drain rod are in a closed state. When the filter is in a rolled-up state, the two ends of the drain rod are free from the obstruction of the slide rod, so that the two ends of the drain rod are in an open state.

[0017] When the filter is in the rolled-up state, the two ends of the drain rod are open. At this time, the sewage squeezed out of the impurities can enter the drain rod through the through holes and be discharged outward through the two ends of the drain rod, which is beneficial to improve the extrusion drainage effect.

[0018] The outer side of the support rod is connected with a baffle plate, and when the filter screen is in a rolled-up state, the baffle plate can close the junction between the rolled-up filter screen and the fixed end.

[0019] The beneficial effects of the present invention are: 1. The present invention drives the support rod to move along the length direction of the sewage pool through the first driving component, and drives the filter to move synchronously. During this process, the filter can filter impurities in the sewage and intercept the impurities on one side of the filter. Then, the filter is driven by the second driving component to be rolled up, so that the filter is switched from a flat state to a rolled up state, and at the same time, the impurities on one side of the filter are synchronously rolled up in the filter. During this process, the sewage with residual impurities is squeezed out. By salvaging and squeezing the impurities, the subsequent sedimentation efficiency can be improved, the sewage treatment effect can be guaranteed, and at the same time, it can avoid the phenomenon that water remains in the impurities and drips when they are fished out, causing pollution to the environment.

[0020] 2. After the impurities are salvaged, the present invention can drive the support rod to rotate around its own axis through the driving member, and drive the filter to rotate synchronously. Then, under the action of the second driving component, the filter is switched from a rolled state to an unfolded state. At this time, the filter is flattened above the sewage, which is convenient for cleaning the impurities on the filter.

[0021] 3. After the filter is cleaned, the support rod is driven to rotate by the driving member, and the filter is driven to rotate synchronously, so that the rolled end of the filter is in contact with the bottom of the sewage pool again, and then the filter is driven to move along the length direction of the sewage pool by the first driving component. During this process, the premixed flocculant solution is added to the inside of the support rod, so that the flocculant solution can gradually flow into multiple drain rods and be evenly discharged to different positions in the sewage pool through the through holes on the drain rods, which is conducive to the rapid and uniform mixing of the flocculant and sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the filter screen of the present invention when it is in a flattened state.

[0024] Figure 3 It is a schematic diagram of the assembly structure of the filter screen, the drainage rod and the connecting rod of the present invention.

[0025] Figure 4 It is a schematic diagram of the filter screen of the present invention when it is in a rolled-up state.

[0026] Figure 5 It is a schematic diagram of the assembly structure of the filter screen and the second drive assembly of the present invention.

[0027] Figure 6 It is a schematic diagram of the filter screen of the present invention when it is flattened above the sewage.

[0028] Reference numerals: 1. Sewage tank; 11. Water inlet pipe; 12. Water outlet pipe; 13. Chute; 14. Water pump; 21. Support rod; 22. Filter; 221. Fixed end; 222. Winding end; 23. Drain rod; 231. Through hole; 24. Connecting rod; 25. Screw rod; 26. Sliding block; 31. Sliding rod; 32. Driving roller; 33. Telescopic rod; 34. Baffle. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] like Figures 1 to 6 As shown, a sewage pretreatment coagulation reaction device of the present invention includes a sewage pool 1, on which an inlet pipe 11 and an outlet pipe 12 are provided, and the inlet pipe 11 is provided with a water pump 14 for pumping sewage into the sewage pool 1, and the sewage pool 1 is provided with a support rod 21, a filter screen 22, a drainage rod 23, a first drive assembly and a second drive assembly.

[0031] For ease of understanding, in this embodiment, the length direction of the sewage pool 1 is defined as the left-right direction, and the width direction of the sewage pool 1 is defined as the front-back direction.

[0032] The support rod 21 is arranged along the width direction of the sewage pool 1. The interior of the support rod 21 is hollow, and both ends respectively penetrate the side walls of the sewage pool 1 on the corresponding side and extend outward. A driving member (not shown in the figure) is arranged in the sewage pool 1. The driving member is used to drive the support rod 21 to rotate around its own axis. The filter screen 22 includes a fixed end 221 and a winding end 222. The fixed end 221 is connected to the support rod 21. The winding end 222 can be wound in a direction close to the fixed end 221, so that the filter screen 22 has a flattened state and a rolled state. When in the flattened state, the winding end 222 of the filter screen 22 can contact the bottom of the sewage pool 1, so that The filter screen 22 is arranged at an angle, and a plurality of drainage rods 23 are provided. The plurality of drainage rods 23 are installed on the filter screen 22 at intervals from the fixed end 221 to the winding end 222, and each drainage rod 23 is arranged along the width direction of the sewage pool 1. The interior of each drainage rod 23 is hollow, and a plurality of through holes 231 are axially provided on the outer side. The interiors of the plurality of drainage rods 23 are communicated with the interior of the support rod 21. The first driving component is arranged in the sewage pool 1, and can drive the support rod 21 to move along the length direction of the sewage pool 1. The second driving component is arranged in the sewage pool 1, and can drive the filter screen 22 to switch between a flattened state and a wound state.

[0033] Specifically, when the initial state is set, the support rod 21 is at the leftmost end of the sewage pool 1. After the sewage is pumped into the sewage pool 1 by the water pump 14, the support rod 21 is driven by the first driving component to move from left to right along the length direction of the sewage pool 1, which can drive the filter screen 22 to move synchronously. During this process, the sewage can flow to the left side of the filter screen 22 through the filter holes on the filter screen 22, while impurities such as leaves and pulp in the sewage will be retained on the right side of the filter screen 22. When the filter screen 22 moves to the rightmost end of the sewage pool 1, the filtration of sewage and impurities is completed, and the impurities are retained on the surface of the right side of the filter screen 22. At this time, the winding end 222 of the filter screen 22 is driven to By rolling up in the direction close to the fixed end 221, the impurities on the right side of the filter screen 22 can be synchronously rolled up in the filter screen 22, so that the impurities are squeezed out by the gradual rolling up of the filter screen 22, and the sewage remaining in the impurities is squeezed out, so as to avoid the phenomenon that sewage remains in the impurities and drips when they are fished out, causing pollution to the environment. Then, the support rod 21 is driven by the driving member to rotate around its own axis, and then the filter screen 22 is driven by the second driving component to switch from the rolled-up state to the flattened state. Due to the rotation of the support rod 21, the filter screen 22 can be flattened above the sewage, that is, the filter screen 22 is not in contact with the sewage in the sewage pool 1, and the impurities on the filter screen 22 can be cleaned up at this time.

[0034] After the impurities are cleaned, the support rod 21 is driven to rotate by the driving member, and the filter screen 22 is driven to rotate synchronously, so that the reeled end 222 of the filter screen 22 contacts the bottom of the sewage pool 1 again, and then the support rod 21 is driven by the first driving component to move from right to left along the length direction of the sewage pool 1, and the filter screen 22 is driven to move synchronously. During this process, the premixed flocculant solution is added to the support rod 21, and the flocculant solution will flow inside the support rod 21, and gradually flow into the multiple drainage rods 23, and then from the through holes 23 on the drainage rods 23. 1 is discharged into the sewage. Since a plurality of drain rods 23 are installed on the filter screen 22 at intervals from the fixed end 221 to the reeling end 222, and a plurality of through holes 231 are opened along the axial direction of the drain rods 23, the flocculant solution can be discharged to different positions in the sewage through the drain rods 23 and the through holes 231 on the drain rods 23, which is conducive to achieving rapid and uniform mixing of the flocculant solution and the sewage. At the same time, through the movement of the filter screen 22, the sewage in the sewage pool 1 can flow to a certain extent, which helps the floccules to form better, promotes the collision and aggregation between them, and thus accelerates the sedimentation process.

[0035] In addition, the driving member can drive the support rod 21 to rotate around its own axis, and drive the filter screen 22 to rotate synchronously with the support rod 21, so that when the sewage in the sewage pool 1 of different depths is treated, the different inclination degrees of the filter screen 22 can be used to make the rolled end 222 of the filter screen 22 always contact with the bottom of the sewage pool 1, thereby ensuring the effect of salvaging impurities.

[0036] In some embodiments, a connecting rod 24 is also installed on the filter screen 22. The connecting rod 24 is arranged perpendicular to the axial direction of the drainage rod 23. One end of the connecting rod 24 extends into the support rod 21 and communicates with the interior of the support rod 21. The other end of the connecting rod 24 passes through multiple drainage rods 23 in sequence and communicates with the interior of the drainage rod 23. The connecting rod 24 is made of elastic material so that when the filter screen 22 is rolled up, the connecting rod 24 can be rolled up synchronously with the filter screen 22.

[0037] Specifically, Figures 3 to 6 As shown, after the flocculant solution is added into the support rod 21, the flocculant solution will gradually flow into the connecting rod 24, and in the process of flowing downward along the connecting rod 24, it will gradually flow into multiple drainage rods 23, and then be discharged to different positions in the sewage pool 1 through the through holes 231 on the drainage rods 23.

[0038] In some embodiments, a slide groove 13 is provided on the side wall of the sewage pool 1 along its length direction, and the first driving component includes a motor, a screw 25 and a slider 26. The motor is provided on the sewage pool 1 (not shown in the figure), and the screw 25 is provided in the slide groove 13 along the length direction of the sewage pool 1. The output end of the motor is connected to the screw 25, and the slider 26 is slidably provided in the slide groove 13 and threadedly matched with the screw 25. The two ends of the support rod 21 respectively pass through the slider 26 on the corresponding side and are rotationally connected to the slider 26.

[0039] Specifically, Figures 1 to 3 As shown, when the starting motor drives the screw 25 to rotate, the threaded cooperation between the screw 25 and the slider 26 can drive the slider 26 to move along the axial direction of the screw 25. During this process, the support rod 21 connected to the slider 26 can be driven to move synchronously, so that the support rod 21 can move along the length direction of the sewage pool 1.

[0040] The second driving assembly includes a slide bar 31 and a driving roller 32. The slide bar 31 is tilted relative to the height direction of the sewage pool 1. One end of the slide bar 31 is connected to the support rod 21, and the other end extends into the sewage pool 1 and contacts the bottom of the sewage pool 1. The driving roller 32 is arranged along the width direction of the sewage pool 1 and is connected to the winding end 222 of the filter screen 22. The driving roller 32 is a self-driving structure, so that the driving roller 32 can rotate around its own axis while moving along the length direction of the slide bar 31, so that the driving roller 32 can roll up the filter screen 22 upward or flatten the filter screen 22 downward along the length direction of the slide bar 31. The self-driving structure is a prior art and will not be repeated here. A telescopic rod 33 is provided between the slide bar 31 and the driving roller 32. One end of the telescopic rod 33 is rotatably sleeved on the outer side of the driving roller 32, and the other end slides with the slide bar 31 along the length direction of the slide bar 31, so that the length of the telescopic rod 33 can be adapted according to the distance between the slide bar 31 and the driving roller 32.

[0041] Specifically, Figures 3 to 6 As shown, when the filter screen 22 moves from the leftmost end to the rightmost end of the sewage pool 1, the filtration of impurities is completed, and the impurities are trapped on the surface of the right side of the filter screen 22. At this time, the driving roller 32 is started, and the driving roller 32 rotates around its own axis while moving upward along the length direction of the slide bar 31 to reel in the winding end 222 of the filter screen 22 in the direction close to the fixed end 221, and the impurities trapped on the filter screen 22 are synchronously reeled in the filter screen 22. During this process, the length of the telescopic rod 33 will be adapted according to the distance between the slide bar 31 and the driving roller 32 to ensure the winding stability. By reeling in the filter screen 22, the sewage remaining in the impurities can be squeezed out, avoiding the phenomenon that when the impurities are fished out of the sewage pool 1, there is sewage remaining in the impurities and dripping, thereby causing pollution to the environment.

[0042] It should be noted that when the filter screen 22 is in a flattened state, the sliding rod 31 can close the two ends of the drain rod 23, so that the two ends of the drain rod 23 are in a closed state. When the filter screen 22 is in a rolled-up state, the two ends of the drain rod 23 are free from the obstruction of the sliding rod 31, so that the two ends of the drain rod 23 are in an open state.

[0043] Specifically, Figures 2 to 5As shown, when the filter screen 22 is in a flattened state, the sliding rod 31 can close the two ends of the drain rod 23, so that the two ends of the drain rod 23 are in a closed state, so that the flocculant solution enters the drain rod 23 and can only be evenly discharged into the sewage pool 1 through the through holes 231 on the drain rod 23, and will not be discharged outward through the two ends of the drain rod 23; when the filter screen 22 is in a rolled-up state, the two ends of the drain rod 23 are separated from the obstruction of the sliding rod 31, so that the two ends of the drain rod 23 are in an open state. At this time, after the sewage in the impurities is squeezed out by the rolling of the filter screen 22, this part of the sewage will enter the drain rod 23 through the through holes 231, and then be discharged back into the sewage pool 1 through the two ends of the drain rod 23, so that the sewage does not need to penetrate outward through the rolled-up multi-layer filter screen 22, and can be directly discharged outward through the drain rod 23, thereby improving the extrusion drainage efficiency.

[0044] like Figures 3 to 5 As shown, a baffle 34 is connected to the outer side of the support rod 21. When the filter screen 22 is in a rolled-up state, the baffle 34 can close the junction between the rolled-up filter screen 22 and the fixed end 221, so that when the support rod 21 rotates and drives the rolled-up filter screen 22 to separate from the sewage, impurities rolled up in the filter screen 22 can be prevented from being discharged from the junction between the rolled-up filter screen 22 and the fixed end 221, thereby improving the effect of salvaging impurities.

[0045] like Figures 1 to 6 As shown, the specific working process of this device is: S1, impurity filtering: the first driving assembly drives the support rod 21 to move along the length direction of the sewage pool 1, and drives the filter screen 22 to move synchronously. During this process, the filter screen 22 can filter the impurities in the sewage and trap the impurities on one side of the filter screen 22; S2, impurity extrusion: the reeling end 222 of the filter screen 22 is driven by the second driving component to reel in a direction close to the fixed end 221, so that the filter screen 22 is switched from the flattened state to the reeling state, and the impurities trapped on one side of the filter screen 22 are synchronously reeled in the filter screen 22, and in this process, the sewage remaining in the impurities is squeezed out; S3, impurity cleaning: The driving member drives the support rod 21 to rotate around its own axis, and then the second driving component drives the filter screen 22 to switch from the rolled state to the flattened state, so that the filter screen 22 is flattened above the sewage to facilitate cleaning of impurities; S4, adding flocculant solution: the first driving assembly drives the support rod 21 to move along the length direction of the sewage pool 1, and drives the filter screen 22 to move synchronously. During this process, the premixed flocculant solution is added to the inside of the support rod 21, and the flocculant solution gradually flows into the multiple drainage rods 23, and is evenly discharged to different positions in the sewage pool 1 through the through holes 231 on the drainage rods 23; S5. Floccules salvage: After the coagulation and sedimentation are completed, the floccules formed in the sewage pool 1 are salvaged.

[0046] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A sewage pretreatment coagulation reaction device, comprising a sewage pool (1), wherein the sewage pool (1) is provided with an inlet pipe (11) and an outlet pipe (12), characterized in that: Also includes: A support rod (21), the support rod (21) is arranged along the width direction of the sewage pool (1), the interior of the support rod (21) is hollow, and both ends of the support rod (21) respectively penetrate the side wall of the sewage pool (1) on the corresponding side and extend outward, and a driving member is provided on the sewage pool (1) and can drive the support rod (21) to rotate around its own axis; A filter screen (22), the filter screen (22) comprising a fixed end (221) and a reeling end (222), the fixed end (221) being connected to the support rod (21), the reeling end (222) being capable of reeling in a direction close to the fixed end (221), so that the filter screen (22) has a flattened state and a reeled state, and when in the flattened state, the reeling end (222) is capable of contacting the bottom of the sewage pool (1), so that the filter screen (22) is tilted; A plurality of drainage rods (23), the plurality of drainage rods (23) being installed on the filter screen (22) at intervals from the fixed end (221) to the reeling end (222), the interior of each drainage rod (23) being hollow and communicating with the interior of the support rod (21), and a plurality of through holes (231) being provided on the outer side of the drainage rod (23) along the axial direction; A first driving assembly capable of driving the support rod (21) to move along the length direction of the sewage tank (1); The second driving component is capable of driving the filter screen (22) to switch between a flattened state and a rolled-up state.

2. A sewage pretreatment coagulation reaction device according to claim 1, characterized in that: A connecting rod (24) is also mounted on the filter screen (22). The connecting rod (24) is arranged perpendicular to the axial direction of the drainage rod (23). One end of the connecting rod (24) extends into the support rod (21) and communicates with the interior of the support rod (21). The other end of the connecting rod (24) passes through a plurality of drainage rods (23) in sequence and communicates with the interior of the drainage rod (23).

3. A sewage pretreatment coagulation reaction device according to claim 2, characterized in that: The connecting rod (24) is made of an elastic material, so that when the filter screen (22) is rolled up, the connecting rod (24) can be rolled up synchronously with the filter screen (22).

4. A sewage pretreatment coagulation reaction device according to claim 1, characterized in that: A slide groove (13) is provided on the side wall of the sewage pool (1) along its length direction. The first driving component comprises a motor, a screw rod (25) and a slider (26). The motor is provided on the sewage pool (1). The screw rod (25) is provided in the slide groove (13) along the length direction of the sewage pool (1). The output end of the motor is connected to the screw rod (25). The slider (26) is slidably provided in the slide groove (13) and is threadably matched with the screw rod (25). Both ends of the support rod (21) respectively penetrate the slider (26) on the corresponding side and are rotationally connected to the slider (26).

5. A sewage pretreatment coagulation reaction device according to claim 1, characterized in that: The second driving assembly comprises a slide bar (31) and a driving roller (32); the slide bar (31) is arranged obliquely in the height direction relative to the sewage pool (1); one end of the slide bar (31) is connected to the support bar (21); the other end extends into the sewage pool (1) and contacts the bottom of the sewage pool (1); the driving roller (32) is arranged along the width direction of the sewage pool (1) and is connected to the winding end (222) of the filter screen (22); the driving roller (32) can wind up the filter screen (22) or flatten the filter screen (22) downward along the length direction of the slide bar (31).

6. A sewage pretreatment coagulation reaction device according to claim 5, characterized in that: A telescopic rod (33) is provided between the slide bar (31) and the driving roller (32); one end of the telescopic rod (33) is rotatably sleeved on the outside of the driving roller (32), and the other end of the telescopic rod (33) is slidably matched with the slide bar (31) along the length direction of the slide bar (31), so that the length of the telescopic rod (33) can be adapted according to the distance between the slide bar (31) and the driving roller (32).

7. A sewage pretreatment coagulation reaction device according to claim 6, characterized in that: When the filter screen (22) is in a flattened state, the slide bar (31) can close the two ends of the drainage rod (23), so that the two ends of the drainage rod (23) are in a closed state; when the filter screen (22) is in a rolled-up state, the two ends of the drainage rod (23) are free from the obstruction of the slide bar (31), so that the two ends of the drainage rod (23) are in an open state.

8. A sewage pretreatment coagulation reaction device according to claim 6, characterized in that: A baffle (34) is connected to the outer side of the support rod (21); when the filter screen (22) is in a rolled-up state, the baffle (34) can seal the junction between the rolled-up filter screen (22) and the fixed end (221).

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