Impurity filtering device for sewage treatment

Abstract

The utility model provides an impurity filtering device for sewage treatment, which comprises a box body, a filter screen and a scraping plate slidably arranged on the filter screen are arranged in the box body, and the scraping plate is abutted against one surface of the filter screen. A driving assembly used for driving the scraping plate to move and a plate abutting assembly used for abutting the scraping plate against the filter screen are further arranged in the box body; the abutting plate assembly comprises a fastening bolt penetrating through the box body and a pressing block in sliding fit with the box body, the fastening bolt is in threaded fit with the box body, the fastening bolt is distributed in the direction close to or away from the scraping plate, and the end, extending into the box body, of the fastening bolt is movably connected with the pressing block; the pressing block is matched with the box body in a sliding mode in the length direction of the fastening bolt, and the scraping plate is matched with the pressing block in a sliding mode in the sliding direction of the scraping plate. The sewage treatment device is convenient for exporting and collecting impurities, prevents the sewage treatment progress from being influenced, and has the advantages of high efficiency and convenience.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field especially sewage treatment's impurity filter device. BACKGROUND

[0002] Sewage treatment is through various technical means, and the process that sewage is handled to can safely discharge or the water quality of reusing. However, the sewage to be handled usually accompanies some impurities and particulate matters, and the impurity type is diversified, and part of the impurities is relatively small or easy to adhere, will cause certain influence to subsequent sewage treatment,

[0003] Therefore, before sewage treatment, the impurities and particulate matters need to be removed, so as to facilitate subsequent sewage treatment work.

[0004] In order to facilitate the filtration of impurities in sewage, the technical personnel developed the related filter device, for example, the utility model involved in an impurity filter device with the authorization publication number CN204319874U, including the storage pool of the top opening and the rope inside the storage pool, the water outlet is opened on one side of the storage pool, and the rope is longitudinally and transversely staggered to form a rope net. When filtering, sewage flows into the top opening of the storage pool, impurities are intercepted above the rope net, sewage penetrates into the storage pool through the rope net, and then flows into the sewage treatment tank through the water outlet.

[0005] The impurity filter device in the related art is used, and after a long time of filtration work, a large amount of impurities will accumulate on the rope net. A large amount of impurities accumulation is easy to cause blockage, and manual salvage is needed to clean the impurities, which is not convenient for the export and collection of impurities, and the filtration efficiency is low, thereby affecting the sewage treatment efficiency. UTILITY MODEL CONTENTS

[0006] In order to improve the existing problems that the impurities are not convenient to export and collect, the filtration efficiency is low, and the sewage treatment efficiency is affected, the utility model provides an impurity filter device which is convenient for the export and collection of impurities, prevents affecting the sewage treatment progress and has high efficiency, convenience.

[0007] The utility model provides a kind of impurity filter device for sewage treatment, using following technical scheme:

[0008] A kind of impurity filter device for sewage treatment, including box, the filter screen is arranged in the box, and the scraper is slidably arranged in the filter screen, the scraper is abutted to one side of filter screen, the driving assembly for driving the scraper moves and the abutment plate component for abutting the scraper to filter screen are also arranged in the box;

[0009] The resisting plate assembly comprises a fixing bolt penetrating the box, and a pressing block slidingly fitted to the box, the fixing bolt is threadedly fitted to the box, the fixing bolt is distributed along the direction of approaching or moving away from the scraper, one end of the fixing bolt extending into the box is movably connected with the pressing block, the pressing block is slidingly fitted to the box along the length direction of the fixing bolt, and the scraper is slidingly fitted to the pressing block along the direction of sliding of the scraper.

[0010] Through the technical scheme, the implementation principle of the present application is that the driving of the fixing bolt to rotate drives the pressing block to move along the length direction of the fixing bolt, so that the scraper is tightly resisted against the filter screen, thereby reducing the gap between the scraper and the filter screen. When impurities are filtered, the sewage to be filtered flows into the box, the impurities in the sewage are intercepted by the filter screen, and then the sewage flows out of the box, so that the filtering is completed. After a period of filtering, the driving assembly drives the scraper to move, and the force with which the driving block drives the scraper to move is greater than the force with which the pressing block tightly resists the scraper, so that the impurities on the filter screen are cleaned, the particles or impurities are prevented from passing through the gap between the scraper and the filter screen, the relatively small impurities are effectively cleaned, the impurity residues are reduced, the effective filtering area of the filter screen is increased, the impurities are facilitated to be guided out and collected, the sewage treatment progress is prevented from being affected, and the sewage treatment efficiency is improved.

[0011] Preferably, the pressing block comprises a driving portion, a first pressing portion and a second pressing portion, the fixing bolt is connected with one side of the driving portion, the end of the first pressing portion is slidingly fitted to the inner wall of the box, the first pressing portion is slidingly fitted with the scraper, the second pressing portion is consistent in structure and size with the first pressing portion, and the second pressing portion is opposite to the first pressing portion along the direction perpendicular to the sliding direction of the scraper.

[0012] Through the technical scheme, the scraper is slidingly fitted to the pressing block, so that the equipment runs more stably, the pressing block more stably drives the scraper to tightly resist against the filter screen, and the scraper is ensured to be tightly fitted to the filter screen.

[0013] Preferably, the first pressing portion and the second pressing portion are both provided with guide edges, the guide edges are away from the scraper, and the guide edges guide the sewage from away from the scraper to close to the scraper.

[0014] Through the technical scheme, the sewage is prevented from remaining in the first pressing portion.

[0015] Preferably, one end of the fixing bolt located outside the box is sleeved with a hand wheel.

[0016] Through the technical scheme, the driving of the hand wheel to rotate can conveniently drive the fixing bolt to rotate, thereby driving the pressing block to move along the vertical direction.

[0017] Preferably, the driving assembly comprises a screw rod penetrating the box, a driving block sleeved on the screw rod, and a driving member arranged at one end of the screw rod, the screw rod is distributed along the sliding direction of the scraper, the driving block comprises a connecting portion and a sleeving portion, one side of the connecting portion is connected with the scraper, the sleeving portion is sleeved on the screw rod, and the sleeving portion is threadedly connected with the screw rod, and the driving end of the driving member is connected with one end of the screw rod.

[0018] Through the above technical scheme, when driving, the driving member drives the screw rod to rotate, the screw rod drives the driving block to move along the length direction of the screw rod, and the driving block drives the scraper to move, so that the impurities on the filter screen can be cleaned out of the filter screen through the scraper, thereby preventing the impurities from accumulating on the filter screen and affecting the flow of sewage, so as to facilitate subsequent cleaning.

[0019] Preferably, the driving member is a stepping motor, and the stepping motor rotates alternately in forward and reverse directions.

[0020] Through the above technical scheme, when the filter screen is filtered for a period of time, the stepping motor drives the screw rod to rotate, the driving block drives the driving block to move, and the driving block drives the scraper to move, thereby cleaning the impurities on the filter screen. By rotating the stepping motor alternately in forward and reverse directions, the scraper sweeps back and forth, so that the filtered impurities are located on both sides of the filter screen, thereby eliminating the need for manual salvage and cleaning, improving the filtering efficiency, and further improving the sewage treatment efficiency.

[0021] Preferably, the driving assembly is provided with two groups, the two groups of driving assemblies are basically identical in structure, and the two groups of driving assemblies are opposite along the direction perpendicular to the sliding direction of the scraper.

[0022] Through the above technical scheme, when cleaning, the two groups of driving assemblies synchronously drive the scraper, which is conducive to more stable driving of the scraper to move and prevents the scraper from deviating or tilting.

[0023] Preferably, the box is provided with a water inlet and a water outlet respectively at opposite sides, the water inlet is close to the scraper, and the water outlet is away from the scraper.

[0024] Through the above technical scheme, when filtering, the sewage to be treated flows into the water inlet, so that the sewage flows through the filter screen and is filtered under the action of the water pressure, and then flows out of the water outlet, thereby filtering the sewage to facilitate subsequent sewage treatment.

[0025] Preferably, a collecting box is inserted and matched in the box, and the collecting box is close to the filter screen.

[0026] Through the above technical scheme, when the scraper moves along the width direction of the filter screen, the impurities on the filter screen gradually fall into the collecting box, thereby collecting the impurities, and relevant personnel can regularly pull out the collecting box for cleaning, thereby facilitating the cleaning of relevant personnel.

[0027] Preferably, a drain opening is formed on the collecting box, and the drain opening is communicated with the water outlet.

[0028] Through the technical scheme, when the scraper cleans the impurities on the filter screen into the collecting box, a small amount of sewage gradually flows to the bottom of the collecting box and passes through the drain opening and the water outlet through a period of static, so that the sewage in the collecting box is better discharged.

[0029] Compared with the prior art, the utility model has the advantages of:

[0030] 1. By driving the hand wheel to rotate, the close bolt is driven to rotate, the close bolt drives the pressing block to move along the vertical direction, so that the scraper is tightly pressed against the filter screen, which is beneficial to reduce the gap between the scraper and the filter screen;

[0031] 2. When filtering impurities, the sewage to be filtered flows in from the water inlet, the impurities in the sewage are intercepted by the filter screen, and the sewage flows out from the water outlet, so that the filtering can be conveniently completed;

[0032] 3. After a period of filtering, the stepping motor drives the screw rod to rotate, drives the driving block to move, the driving block drives the scraper to move along the width direction of the filter screen, and the driving force of the driving block driving the scraper to move is greater than the force of the pressing block tightly pressing the scraper, so that the impurities on the filter screen are cleaned back and forth, manual fishing is not needed, which is beneficial to the export and collection of the impurities and improves the filtering efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0034] Figure 1 It is the overall structure schematic view in the embodiment of the utility model.

[0035] Figure 2 It is the sectional view of the box body in the embodiment of the utility model.

[0036] Figure 3 It is the partial structure schematic view of the filtering mechanism in the embodiment of the utility model.

[0037] Figure 4 It is the assembly structure schematic view of the filtering mechanism and the box body in the embodiment of the utility model.

[0038] Figure 5 It is the assembly structure schematic view of the collecting box and the box body in the embodiment of the utility model.

[0039] Figure 6 is the structural schematic diagram of the collecting box in the embodiment of the utility model.

[0040] Among them, the part number explanation is: 1, the box body; 2, filter screen; 3, scraper; 4, locking bolt; 41, hand wheel; 5, briquetting; 51, driving part; 52, first pressure part; 53, second pressure part; 6, guide along; 7, screw; 8, driving block; 81, connecting part; 82, sheathed part; 9, driving piece; 10, water inlet; 11, water outlet; 12, collecting box; 13, drain. DETAILED DESCRIPTION

[0041] The utility model embodiments will be described below with reference to the accompanying drawings Figures 1-6 , the technical scheme in the embodiment of the utility model is clearly and completely described, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of the utility model protection.

[0042] A kind of impurity filtering device for sewage treatment, with reference to Figure 1 With Figure 2 , including the box body 1 of cuboid and the filter mechanism for filtering impurities and collecting in the box body 1.

[0043] With reference to Figure 1 With Figure 2 , the top of box body 1 is equipped with water inlet 10, water inlet 10 is used to access the sewage to be filtered, water inlet 10 is circular and penetrates in the inside of box body 1. The bottom of box body 1 is equipped with water outlet 11, water outlet 11 is used to discharge the filtered sewage, to facilitate subsequent sewage treatment, water outlet 11 is also circular and penetrates in the inside of box body 1, water inlet 10 and water outlet 11 are opposite along vertical direction. When filtering, the sewage to be treated flows in from water inlet 10, flows through filter mechanism and filters by the action of water flow pressure and gravity, finally flows out from water outlet 11, i.e. sewage can be filtered, to facilitate subsequent sewage treatment.

[0044] Specifically, with reference to Figure 2 With Figure 3 , filter mechanism includes filter screen 2 arranged in the box body 1, scraper 3 slidingly arranged on filter screen 2, driving assembly for driving scraper 3 to slide, abutting plate assembly for abutting scraper 3 to filter screen 2 and collecting box 12 for collecting impurities.

[0045] With reference to Figure 2 With Figure 3The filter screen 2 is in a rectangular shape and is distributed along the width direction of the box body 1. The filter screen 2 is fixedly connected to the inner wall of the box body 1. One side of the filter screen 2 faces the water inlet 10, and the other side faces the water outlet 11. The scraper 3 is a long plate and is distributed along the length direction of the filter screen 2. One long side of the scraper 3 abuts against the filter screen 2. The scraper 3 slides along the width direction of the filter screen 2 and is close to the water inlet 10. When the sewage to be filtered flows into the box body 1 through the water inlet, the impurities in the sewage are intercepted by the filter screen 2 and flow out of the water outlet 11, thus completing the filtration. Then, the scraper 3 is driven to slide along the width direction of the filter screen 2 by the driving assembly, so as to push the impurities on the filter screen 2 away from the filter screen 2, thereby avoiding the impurities from accumulating on the filter screen 2 and affecting the flow rate of the sewage, and facilitating the impurities to be guided out.

[0046] Specifically, referring to Figure 3 and Figure 4 The driving assembly comprises a screw rod 7 penetrating through the box body 1, a driving block 8 sleeved on the screw rod 7, and a driving member 9 arranged at one end of the screw rod 7. The screw rod 7 is distributed along the width direction of the filter screen 2 and is close to one short side of the filter screen 2. Both ends of the screw rod 7 protrude out of the box body 1. The driving block 8 comprises a connecting portion 81 and a sleeving portion 82. The connecting portion 81 is in an L-shaped block shape. One long side of the connecting portion 81 is connected to the end portion of the scraper 3, so as to support the scraper 3 and make the scraper 3 always vertical, thereby ensuring that one long side of the scraper 3 always abuts against the filter screen 2. The sleeving portion 82 is in a circular cylindrical shape and is distributed along the width direction of the filter screen 2. The side wall of the sleeving portion 82 is fixedly connected to the connecting portion 81 away from one end of the long side. The sleeving portion 82 is sleeved on the screw rod 7 and is threadedly connected with the screw rod 7. When the screw rod 7 is driven to rotate, the driving block 8 is driven to move along the length direction of the screw rod 7, thereby driving the scraper 3 to move. The impurities on the filter screen 2 can be swept out of the filter screen 2 by the scraper 3, so as to prevent the impurities from accumulating on the filter screen 2 and affecting the flow of the sewage, thereby facilitating subsequent cleaning.

[0047] In this embodiment, the driving member 9 is a stepping motor. The stepping motor rotates in a forward-reverse alternating direction. The stepping motor is arranged on the box body 1. The driving end of the stepping motor is connected to one end of the screw rod 7 protruding out of the box body 1. Thus, after a period of filtration, the stepping motor drives the screw rod 7 to rotate, the driving block 8 is driven to move, and the scraper 3 is driven to move along the width direction of the filter screen 2, thereby sweeping the impurities on the filter screen 2. The stepping motor rotates in a forward-reverse alternating direction, so that the scraper 3 sweeps back and forth along the width direction of the filter screen 2, and the filtered impurities are located on both sides of the filter screen 2, thereby avoiding manual fishing and cleaning, improving the filtration efficiency, and further improving the sewage treatment efficiency.

[0048] Referring to Figure 3 and Figure 4The driving assembly is provided with two groups, the two groups of driving assembly are basically consistent in structure, and the two groups of driving assembly are opposite along the length direction of the filter screen 2, so that the driving blocks 8 on the two groups of driving assembly are supported at the two ends of the scraper 3. When cleaning, the scraper 3 is synchronously driven by the two groups of driving assembly, which is beneficial to more stably drive the scraper 3 to move and prevent the scraper 3 from deviating or skewing.

[0049] When impurity filtration is performed, the sewage to be filtered flows into the water inlet 10, the impurities in the sewage are intercepted by the filter screen 2, and the sewage flows out from the water outlet 11, and the filtration is completed. After a period of filtration, the stepper motor drives the screw rod 7 to rotate, drives the driving block 8 to move, and the driving block 8 drives the scraper 3 to move along the width direction of the filter screen 2, so as to clean the impurities on the filter screen 2. At the same time, the scraper 3 is abutted to the filter screen 2 by the abutting plate assembly, so as to prevent particles or impurities from passing through the gap between the scraper 3 and the filter screen 2, effectively clean the relatively small impurities, reduce the impurity residues, and thus improve the cleaning effect.

[0050] Specifically, referring to Figure 3 and Figure 4 , the abutting plate assembly comprises a tightening bolt 4 penetrating the box body 1 and a pressing block 5 movably connected to the tightening bolt 4. The tightening bolt 4 is distributed along the vertical direction, one end of the tightening bolt 4 is located in the box body 1, and the end of the tightening bolt 4 located in the box body 1 is movably connected to the pressing block 5. The tightening bolt 4 is threadedly connected to the box body 1, so that when the tightening bolt 4 is driven to rotate, the pressing block 5 can be driven to move along the vertical direction.

[0051] Referring to Figure 3 and Figure 4 , one end of the tightening bolt 4 located outside the box body 1 is sleeved with a hand wheel 41. By driving the hand wheel 41 to rotate, the tightening bolt 4 can be conveniently driven to rotate, so as to drive the pressing block 5 to move along the vertical direction.

[0052] It should be noted that referring to Figure 3 and Figure 4 , the pressing block 5 comprises a driving part 51, a first pressing part 52 and a second pressing part 53. The cross section of the driving part 51 is in inverted U shape. The closed side of the driving part 51 is connected to the tightening bolt 4. The opening side of the driving part 51 is connected to the first pressing part 52 and the second pressing part 53, and the first pressing part 52 and the second pressing part 53 are respectively close to the two ends of the scraper 3. The first pressing part 52 is in long strip shape. The first pressing part 52 is distributed along the width direction of the filter screen 2. The end of the first pressing part 52 is slidably connected to the inner wall of the box body 1. The first pressing part 52 abuts to the top side of the scraper 3. The side of the first pressing part 52 facing the scraper 3 is provided with a sliding groove (not shown in the figure). The cross section of the sliding groove is in T shape. The sliding groove is distributed along the length direction of the first pressing part 52. The scraper 3 is provided with a sliding block corresponding to the sliding groove. The sliding block and the sliding groove are mutually adapted, that is, the sliding block and the sliding groove are mutually slidably connected.

[0053] With reference to Figure 3 With reference to Figure 4 , the first pressing part 52 is further provided with a guide edge 6 for guiding the flow direction of the sewage, the guide edge 6 is away from the scraper 3, the guide edge 6 is arranged obliquely, and the guide edge 6 guides the sewage away from the scraper 3 to the scraper 3. Thus, the sewage is prevented from remaining in the first pressing part 52.

[0054] With reference to Figure 3 With reference to Figure 4 , the second pressing part 53 is consistent with the size of the first pressing part 52, which is not repeated here. Thus, the scraper 3 is slidingly fitted in the first pressing part 52 and the second pressing part 53, i.e. the scraper 3 is slidingly fitted in the pressing block 5, so that the pressing block 5 more stably drives the scraper 3 to abut against the filter screen 2.

[0055] When the scraper 3 abuts against the filter screen 2, the hand wheel 41 is driven to rotate, the tie bolt 4 is driven to rotate, the tie bolt 4 drives the pressing block 5 to move in the vertical direction, so that the scraper 3 abuts against the filter screen 2, thereby reducing the gap between the scraper 3 and the filter screen 2, i.e. preventing particles or impurities from passing between the scraper 3 and the filter screen 2, effectively cleaning the relatively small impurities, reducing impurity residues, increasing the effective filtering area of the filter screen 2, thereby improving the filtering efficiency. When cleaning, the screw rod 7 is driven to rotate by the stepping motor, the driving block 8 is driven to move, the driving block 8 drives the scraper 3 to move along the width direction of the filter screen 2, and the force with which the driving block 8 drives the scraper 3 to move is greater than the force with which the pressing block 5 abuts against the scraper 3, thereby cleaning the impurities on the filter screen 2, preventing particles or impurities from passing through the gap between the scraper 3 and the filter screen 2, effectively cleaning the relatively small impurities, reducing impurity residues, thereby improving the cleaning effect.

[0056] With reference to Figure 4 With reference to Figure 5 , the collecting box 12 is rectangular, the top of the collecting box 12 is open, the collecting box 12 is inserted and fitted in the box body 1, one long side of the collecting box 12 is close to the filter screen 2, and the collecting box 12 is provided with two, the two collecting boxes 12 are opposite along the width direction of the filter screen 2, so that when the scraper 3 moves back and forth along the width direction of the filter screen 2, the impurities on the filter screen 2 gradually fall into the collecting boxes 12 on both sides, thereby collecting the impurities, and the relevant personnel can clean the collecting boxes 12 regularly, thereby facilitating the cleaning of the relevant personnel.

[0057] In addition, with reference to Figure 5 With reference to Figure 6Since part of the impurities is attached with part of the sewage, the impurities falling into the collecting box 12 are usually accompanied with a small amount of sewage, in order to better drain the sewage in the collecting box 12, the bottom of the collecting box 12 is provided with a plurality of drainage ports 13, the drainage ports 13 are through the bottom of the collecting box 12 and are communicated with the water outlet 11, so that when the scraper 3 sweeps the impurities on the filter screen 2 to the collecting box 12, through a period of static, the small amount of sewage gradually flows to the bottom of the collecting box 12 and passes through the drainage ports 13 and the water outlet 11, so that the sewage in the collecting box 12 is better drained and enters the subsequent sewage treatment work.

[0058] The implementation principle of the present application is that the driving hand wheel 41 is driven to rotate, the clamping bolt 4 is driven to rotate, the clamping bolt 4 drives the pressing block 5 to move in the vertical direction, so that the scraper 3 is tightly abutted to the filter screen 2, thereby reducing the gap between the scraper 3 and the filter screen 2.

[0059] When the impurities are filtered, the sewage to be filtered flows into the water inlet 10, the impurities in the sewage are intercepted by the filter screen 2 and flow out of the water outlet 11, and the filtering is completed. After a period of filtering, the stepping motor drives the screw rod 7 to rotate, the driving block 8 is driven to move, the driving block 8 drives the scraper 3 to move along the width direction of the filter screen 2, and the force with which the driving block 8 drives the scraper 3 to move is greater than the force with which the pressing block 5 abuts against the scraper 3, so that the impurities on the filter screen 2 are swept. That is, the particles or impurities are prevented from passing between the scraper 3 and the filter screen 2, the relatively small impurities are effectively swept, the impurity residues are reduced, the effective filtering area of the filter screen 2 is increased, the impurities are conveniently guided out and collected, the sewage treatment progress is prevented from being affected, and the sewage treatment efficiency is improved.

[0060] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for filtering impurities from sewage water, comprising a tank (1), characterized in that: The box (1) is provided with a filter screen (2) and a scraper (3) slidingly arranged on the filter screen (2), one side of the scraper (3) abutting against the filter screen (2), and the box (1) is further provided with a driving assembly for driving the scraper (3) to move and an abutting plate assembly for abutting the scraper (3) against the filter screen (2); The abutting plate assembly comprises a tightening bolt (4) penetrating the box (1) and a pressing block (5) slidingly fitted in the box (1), the tightening bolt (4) is threadedly fitted with the box (1), the tightening bolt (4) is distributed along the direction close to or away from the scraper (3), one end of the tightening bolt (4) extending into the box (1) is movably connected with the pressing block (5), and the pressing block (5) is slidingly fitted in the box (1) along the length direction of the tightening bolt (4), and the scraper (3) is slidingly fitted in the pressing block (5) along the sliding direction of the scraper (3).

2. The impurity filtering device for sewage treatment according to claim 1, characterized in that: The pressing block (5) comprises a driving portion (51), a first pressing portion (52) and a second pressing portion (53), one side of the tightening bolt (4) is connected with the driving portion (51), the end of the first pressing portion (52) is slidingly fitted with the inner wall of the box (1), the first pressing portion (52) is slidingly fitted with the scraper (3), the second pressing portion (53) is consistent with the structure and size of the first pressing portion (52), and the second pressing portion (53) is opposite to the first pressing portion (52) along the direction perpendicular to the sliding direction of the scraper (3).

3. The impurity filtering device for sewage treatment according to claim 2, characterized in that: The first pressing portion (52) and the second pressing portion (53) are both provided with a guide edge (6), the guide edge (6) is away from the scraper (3), and the guide edge (6) guides the sewage from away from the scraper (3) to close to the scraper (3).

4. The impurity filtering device for sewage treatment according to claim 1, characterized in that: One end of the tightening bolt (4) located outside the box (1) is sleeved with a hand wheel (41).

5. The impurity filtering device for sewage treatment according to claim 1, characterized in that: The driving assembly comprises a screw rod (7) penetrating the box (1), a driving block (8) sleeved on the screw rod (7) and a driving member (9) arranged at one end of the screw rod (7), the screw rod (7) is distributed along the sliding direction of the scraper (3), the driving block (8) comprises a connecting portion (81) and a sleeving portion (82), one side of the connecting portion (81) is connected with the scraper (3), the sleeving portion (82) is sleeved on the screw rod (7), and the sleeving portion (82) is threadedly fitted with the screw rod (7), and the driving end of the driving member (9) is connected with one end of the screw rod (7).

6. The impurity filter device for sewage treatment according to claim 5, characterized in that: The driving member (9) is a stepping motor, and the stepping motor rotates in positive and negative directions alternately.

7. The impurity filtering device for sewage treatment according to claim 5, characterized in that: The driving assembly is provided with two groups, the two groups of driving assemblies are basically consistent in structure, and the two groups of driving assemblies are opposite along the direction perpendicular to the sliding direction of the scraper (3).

8. The impurity filtering device for sewage treatment according to claim 1, characterized in that: Opposite sides of the box (1) are respectively provided with a water inlet (10) and a water outlet (11), the water inlet (10) is close to the scraper (3), and the water outlet (11) is away from the scraper (3).

9. The impurity filtering device for sewage treatment according to claim 8, characterized in that: The box (1) is inserted and fitted with a collecting box (12), and the collecting box (12) is close to the filter screen (2).

10. The impurity filtering device for sewage treatment according to claim 9, characterized in that: The collecting box (12) is provided with a water outlet (13) which is communicated with the water outlet (11).

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