Scum fishing device for wastewater treatment

Abstract

The scum fishing device comprises a treatment pond, a partition plate is installed in one end of the treatment pond, a water outlet pipe is installed in one side of the bottom end of the treatment pond, and a scum discharging opening is formed in the end, away from the water outlet pipe, of the treatment pond; a cleaning mechanism is arranged in the treatment tank, and a fixing assembly is arranged in the cleaning mechanism; wherein the cleaning mechanism comprises a first sliding box installed on one side of the top end of the treatment pond, a second sliding box is installed on the side, away from the first sliding box, of the top end of the treatment pond, a reciprocating lead screw is rotationally connected into the first sliding box, and a first motor is installed at one end of the reciprocating lead screw; therefore, the effect of quickly fishing and collecting the scum can be achieved, the scum cleaning efficiency can be greatly improved, compared with a mode of pushing materials by adopting a scraping plate assembly in the prior art, the method is more convenient, and the primary treatment efficiency of wastewater is improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a scum removal device for wastewater treatment. Background Technology

[0002] Industrial wastewater refers to wastewater, sewage, and waste liquid generated during industrial production processes. It contains industrial production materials, intermediate products, and finished products that are lost with the water, as well as pollutants generated during the production process. In the initial treatment of existing sewage, workers need to use scooping devices to remove the floating scum from the wastewater.

[0003] Publication No. CN211836479U discloses a scum removal device for a wastewater treatment tank. This device uses a telescopic cylinder to move a scraper assembly to the left for scraping. Simultaneously, a first spring is stretched, causing the scraper to move stably. Through the combined action of the collection trough, filter screen, and guide trough, the scum is thoroughly scraped and collected. Excess wastewater in the collection trough is discharged through drainage holes at both ends, effectively preventing excessive scouring of the scum and further improving scum collection efficiency. Brushes remove adhering scum from the inner wall of the wastewater treatment tank, further enhancing cleaning efficiency. When the bottom left end of the scraper abuts against the arc-shaped surface of the partition, the fixing plate pushes the upper part of the scraper to rotate to the left for unloading. However, this patent still has the following problems in actual use:

[0004] This device effectively scrapes and collects scum through the combined action of a collection trough, a filter screen, and a guide trough. Simultaneously, it drains excess wastewater from the collection trough through drainage holes at both ends, effectively preventing excessive scouring of the scum and thus improving collection efficiency. However, the device lacks scum collection capability. As the scraper assembly moves the scum, the flowing wastewater impacts it, causing the scum to detach from the scraper assembly. This results in poor scum removal and inconvenience for operators.

[0005] A scum removal device for wastewater treatment is proposed to address the problems mentioned above. Utility Model Content

[0006] The utility model discloses a purpose at providing a kind of scum fishing device for wastewater treatment, to solve the above background technology proposed at present by the cooperation of material collecting tank, filter screen and material guide groove to scum is fully scraped and collected, simultaneously, by the drainage hole of front and back end surface, excessive sewage in material collecting tank is discharged, effectively avoid the excessive flushing of scum in material collecting tank, to further improve the collection efficiency of scum, but the device does not have the effect of scum collection, so that when the material scraping plate assembly drives scum to move, flowing wastewater impacts scum, and then makes scum separate from material scraping plate assembly, so as to cause the phenomenon that wastewater scum fishing effect is poor, bring inconvenience to staff when using.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of scum fishing device for wastewater treatment, including treatment pool, the inside of one end of the treatment pool is installed with baffle, and the inside of bottom end side of treatment pool is installed with outlet pipe, and the end of treatment pool away from outlet pipe is installed with residue discharge port;The inside of the treatment pool is provided with cleaning mechanism, and the inside of cleaning mechanism is provided with fixed component;

[0008] Wherein, the cleaning mechanism includes the first sliding box installed at the top end of treatment pool, and the second sliding box is installed at the side of the top end of treatment pool away from the first sliding box, and the inside of the first sliding box is rotatably connected with reciprocating screw rod, and the one end of reciprocating screw rod is installed with first motor, and the outside of reciprocating screw rod is screw-connected with first moving frame, and the inside of second sliding box is installed with fixed rod, and the outside of fixed rod is slidably connected with second moving frame, and the top end between first moving frame and second moving frame is installed with fixed plate, and the bottom end of fixed plate is provided with strip-shaped net frame, and the one end of strip-shaped net frame is installed with expansion frame, and the bottom end of fixed plate is installed with connecting plate, and the top end side of strip-shaped net frame is installed with L plate, and the one end between L plate and connecting plate is inserted.

[0009] Preferably, the one end of the strip-shaped net frame is installed with fixed box, and the rotatable connection between fixed box and strip-shaped net frame has rotating rod, and the outside of the one end of rotating rod is installed with fan blade, and the bottom end side of strip-shaped net frame is installed with support plate, and the bottom end of support plate is installed with waterproof box, and the rotatable connection between fixed box, support plate and waterproof box has driving rod, and the bottom end of driving rod is installed with second motor, and the top end of driving rod is installed with first rotating tooth, and the one end of rotating rod is installed with second rotating tooth, and the meshing connection between first rotating tooth and second rotating tooth, and the inside of the one end of strip-shaped net frame is symmetrically installed with filter screen, and the outside of the one end of rotating rod is installed with strip plate, and the one side of strip plate is installed with brush plate.

[0010] Preferably, the fixing assembly comprises a limiting frame symmetrically mounted inside the fixing plate, a sliding rod slidably connected inside the limiting frame, a sliding plate mounted at the bottom end of the sliding rod, a plug block mounted at the bottom end of the sliding plate, the plug block being inserted between the L-shaped plate, a baffle plate mounted outside the sliding rod, and an extension spring mounted between the baffle plate and the inside of the limiting frame.

[0011] Preferably, the first sliding box and the second sliding box are provided with guide grooves at the inside of the bottom end, and the first moving frame and the second moving frame are provided with guide wheels symmetrically rotatably connected at the bottom end, the guide wheels being rollingly connected with the guide grooves.

[0012] Preferably, the limiting frame is symmetrically provided with support rods inside, and the baffle plate is slidably connected outside the support rods.

[0013] Preferably, the extension spring is sleeved outside the sliding rod.

[0014] Preferably, the second motor is arranged inside the waterproof box.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: the first motor is started by the staff to drive the rotation of the reciprocating screw rod, the movement of the first moving frame drives the movement of the fixing plate, the movement of the fixing plate drives the sliding of the second moving frame outside the fixing rod, at this time the fixing plate drives the left-right reciprocating movement of the strip-shaped net frame inside the top end of the treatment tank, and the top scum of the wastewater is collected by the expansion frame, at this time the scum is filtered into the strip-shaped net frame, and the scum is blocked by the inclined plate inside the strip-shaped net frame, so that the effect of quickly collecting the scum can be achieved, and the scum cleaning efficiency can be greatly improved, compared with the existing technology, the material pushing mode of the scraper plate assembly is more convenient, the preliminary wastewater treatment efficiency is improved, the second motor is started by the staff to drive the rotation of the driving rod, the rotation of the first rotating gear drives the rotation of the second rotating gear, the rotation of the rotating rod drives the rotation of the fan blade, the rotation of the fan blade stirs the wastewater inside the expansion frame, so that the scum can quickly enter the inside of the strip-shaped net frame, and the rotation of the fan blade can scatter the large scum blocks, avoiding the phenomenon that the scum blocks the strip-shaped net frame and causes poor collection, the reset property of the extension spring is used, so that the plug blocks are inserted between the L-shaped plates, so that the staff can quickly replace and clean the strip-shaped net frame, the staff can easily take out the scum inside the strip-shaped net frame, and the cleaning and use efficiency of the strip-shaped net frame is greatly improved.

[0016] 1. The first motor is started by the staff to drive the rotation of the reciprocating screw rod, the rotation of the reciprocating screw rod drives the movement of the first moving frame, the movement of the first moving frame drives the movement of the fixed plate, the movement of the fixed plate drives the sliding of the second moving frame outside the fixed rod, at this time the fixed plate drives the strip-shaped net frame to move back and forth inside and outside the top end of the treatment pool, and then the top scum of the wastewater is collected by the expansion frame, at this time the scum is filtered into the strip-shaped net frame, and the scum is blocked by the inclined plate inside the strip-shaped net frame, so that the effect of quickly collecting the scum can be realized, and the scum cleaning efficiency can be greatly improved; compared with the existing technology, the material pushing mode of the scraper plate assembly is more convenient, the preliminary wastewater treatment efficiency is improved, and the staff is convenient when using; the second motor is started by the staff to drive the rotation of the driving rod, the rotation of the driving rod drives the rotation of the first rotating tooth, the rotation of the first rotating tooth drives the rotation of the second rotating tooth, the rotation of the second rotating tooth drives the rotation of the rotating rod, and the rotation of the rotating rod drives the rotation of the fan blade; the rotation of the fan blade stirs the wastewater inside the expansion frame, so that the scum can quickly enter the strip-shaped net frame, and the rotation of the fan blade can scatter the large scum block, so that the phenomenon of poor collection caused by the blockage of the strip-shaped net frame is avoided; when the scum enters the strip-shaped net frame, the excess wastewater is discharged through the strip-shaped net frame and the filter screen; the rotation of the rotating rod drives the rotation of the strip plate, and the rotation of the strip plate drives the bristles on the surface of the brush plate to clean the filter screen, so that the phenomenon of poor wastewater filtration caused by the blockage of the filter screen is avoided, and the scum collection efficiency is greatly improved, which is convenient for the staff when using.

[0017] 2. The staff inserts one end of the L-shaped plate into the connecting plate, pulls the two groups of slide rods to slide in the limiting frame, and moves the baffle at one end of the slide rod, and the two ends of the baffle slide outside the supporting rod through the extension of the extension spring, and the slide rod is quickly reset through the elasticity of the extension spring, so that a plurality of insertion blocks are inserted between the L-shaped plate, and the effect of quickly fixing and limiting the L-shaped plate is realized, so that the staff can quickly replace and clean the strip-shaped net frame, the staff can take out the scum inside the strip-shaped net frame, the cleaning and use efficiency of the strip-shaped net frame is greatly improved, and the staff is convenient when using. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a sectional view of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the overall reverse structure of the utility model;

[0021] Figure 4 It is the sectional view of the whole structure of the strip-shaped net frame in the utility model;

[0022] Figure 5 It is the schematic view of the whole structure of the strip-shaped net frame in the utility model;

[0023] Figure 6 It is the schematic view of the enlarged structure of part A in the utility model.

[0024] In the figure: 1, treatment pool; 101, partition; 102, water outlet pipe; 103, slag discharge port; 2, cleaning mechanism; 201, first sliding box; 202, second sliding box; 203, reciprocating screw rod; 204, first motor; 205, first moving frame; 206, fixed rod; 207, second moving frame; 208, fixed plate; 209, strip-shaped net frame; 210, expansion frame; 211, connecting plate; 212, L plate; 213, fixed box; 214, rotating rod; 215, fan blade; 216, support plate; 217, waterproof box; 218, driving rod; 219, second motor; 220, first rotating tooth; 221, second rotating tooth; 222, filter screen; 223, strip plate; 224, brush plate; 225, guide groove; 226, guide wheel; 3, fixed assembly; 301, limiting frame; 302, sliding rod; 303, sliding plate; 304, plug; 305, baffle; 306, extension spring; 307, support rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0026] Please refer to Figures 1-6 The utility model provides technical scheme: a wastewater treatment is with scum salvaging device, including treatment pool 1, the inside installation of one end of treatment pool 1 has partition 101, and the inside installation of bottom end one side of treatment pool 1 has water outlet pipe 102, and the installation of one end of treatment pool 1 away from water outlet pipe 102 has slag discharge port 103, the inside of treatment pool 1 is provided with cleaning mechanism 2, and the inside of cleaning mechanism 2 is provided with fixed assembly 3,

[0027] The cleaning mechanism 2 comprises a first sliding box 201 mounted on one side of the top end of the treatment tank 1, a second sliding box 202 is mounted on the side of the top end of the treatment tank 1 away from the first sliding box 201, a reciprocating screw rod 203 is rotatably connected in the first sliding box 201, a first motor 204 is mounted on one end of the reciprocating screw rod 203, a first moving frame 205 is threadedly connected to the outer side of the reciprocating screw rod 203, a fixed rod 206 is mounted in the second sliding box 202, a second moving frame 207 is slidably connected to the outer side of the fixed rod 206, a fixed plate 208 is mounted between the top ends of the first moving frame 205 and the second moving frame 207, a strip-shaped mesh frame 209 is arranged at the bottom end of the fixed plate 208, an expansion frame 210 is mounted on one end of the strip-shaped mesh frame 209, a connecting plate 211 is mounted at the bottom end of the fixed plate 208, an L-shaped plate 212 is mounted on one side of the top end of the strip-shaped mesh frame 209, and the L-shaped plate 212 is inserted between one end of the connecting plate 211, so that the floating sludge can be quickly collected, the cleaning efficiency of the floating sludge is greatly improved, the method of pushing the material by using the scraper plate assembly in the prior art is more convenient, the preliminary treatment efficiency of the wastewater is improved, and the workers are convenient when using.

[0028] One end of the strip-shaped screen frame 209 is provided with a fixed box 213, and the fixed box 213 and the strip-shaped screen frame 209 are rotatably connected with a rotating rod 214, and one end of the rotating rod 214 is provided with a fan blade 215 outside, and the bottom end of the strip-shaped screen frame 209 is provided with a support plate 216 on one side, and the bottom end of the support plate 216 is provided with a waterproof box 217, and the fixed box 213, the support plate 216 and the waterproof box 217 are rotatably connected with a driving rod 218, and the bottom end of the driving rod 218 is provided with a second motor 219, and the second motor 219 is arranged in the waterproof box 217, and the top end of the driving rod 218 is provided with a first rotating tooth 220, and one end of the rotating rod 214 is provided with a second rotating tooth 221, and the first rotating tooth 220 and the second rotating tooth 221 are meshingly connected, and the inside of one end of the strip-shaped screen frame 209 is symmetrically provided with a filter screen 222, and the outside of one end of the rotating rod 214 is provided with a strip plate 223, and one side of the strip plate 223 is provided with a brush plate 224, so that the scum can quickly enter the inside of the strip-shaped screen frame 209, and the rotation of the fan blade 215 can scatter the larger scum block, avoiding the phenomenon that the scum blocks the strip-shaped screen frame 209 and causes poor collection, when the scum enters the inside of the strip-shaped screen frame 209, at this time, the excess wastewater is discharged through the strip-shaped screen frame 209 and the filter screen 222, the rotation of the rotating rod 214 drives the rotation of the strip plate 223, the rotation of the strip plate 223 drives the bristles on the surface of the brush plate 224 to clean the filter screen 222, thereby effectively avoiding the phenomenon that the scum blocks the filter screen 222 and causes poor wastewater filtration, thereby greatly improving the scum collection efficiency, bringing convenience to the staff during use, and the bottom end of the first sliding box 201 and the second sliding box 202 is provided with a guide groove 225, and the bottom end of the first moving frame 205 and the second moving frame 207 is rotatably connected with a guide wheel 226, and the guide wheel 226 and the guide groove 225 are rollingly connected, the movement of the guide wheel 226 is driven by the first moving frame 205 and the second moving frame 207, at this time, the guide wheel 226 is rollingly connected in the guide groove 225, thereby making the first moving frame 205 and the second moving frame 207 move more stably.

[0029] The fixing assembly 3 comprises a limiting frame 301 symmetrically mounted inside the fixing plate 208, the inside of the limiting frame 301 is slidably connected with a sliding rod 302, the bottom end of the sliding rod 302 is mounted with a sliding plate 303, the bottom end of the sliding plate 303 is mounted with an insertion block 304, the insertion block 304 is inserted between the L-shaped plate 212, the outside of the sliding rod 302 is mounted with a baffle 305, the inside of the baffle 305 is mounted with a telescopic spring 306, the telescopic spring 306 is sleeved on the outside of the sliding rod 302, the inside of the limiting frame 301 is symmetrically mounted with a supporting rod 307, the baffle 305 is slidably connected outside the supporting rod 307, so that the effect of quickly fixing and limiting the L-shaped plate 212 can be achieved, and the effect that the staff can quickly replace and clean the strip-shaped net frame 209 can be achieved, the staff can take out the floating sludge inside the strip-shaped net frame 209, the cleaning and use efficiency of the strip-shaped net frame 209 is greatly improved, and convenience is brought to the staff during use.

[0030] Working principle: before using the floating sludge fishing device for wastewater treatment, the overall situation of the device needs to be checked to determine that it can work normally, according to Figure 1 - Figure 6As shown, by the staff to start the first motor 204 drive reciprocating screw rod 203 rotation, reciprocating screw rod 203 drive the first moving frame 205 movement, the first moving frame 205 movement drive the movement of the fixed plate 208, the fixed plate 208 drive the second moving frame 207 sliding outside the fixed rod 206, the fixed plate 208 at this time drive the bar-shaped net frame 209 inside the top of the processing pool 1 left and right reciprocating movement, and then through the expansion frame 210 to the top of the wastewater scum for salvage, at this time the scum into the bar-shaped net frame 209 inside the filter, and then through the bar-shaped net frame 209 inside the inclined plate to the scum block, so as to achieve the effect of quickly salvage collection of scum, and can greatly improve the scum cleaning efficiency, compared with the prior art using the way of scraping plate assembly to push the material more convenient, improve the wastewater preliminary treatment efficiency, bring convenience to the staff when using, finally through the staff will L plate 212 from the connecting plate 211 inside the pullout, at this time the staff will bar-shaped net frame 209 inside the scum into the partition plate 101 side, and then through the discharge port 103 to discharge the scum, through the staff to start the second motor 219 drive drive rod 218 rotation, drive rod 218 drive the first rotation of the gear 220, the first rotation of the gear 220 drive the second rotation of the gear 221, the second rotation of the gear 221 drive the rotation of the rod 214, the rotation of the rod 214 drive the rotation of the fan blade 215, the rotation of the fan blade 215 to the inside of the expansion frame 210 to the wastewater stirring, so as to make the scum can quickly enter the effect of the bar-shaped net frame 209 inside, and the rotation of the fan blade 215 can be scattered into larger scum block, avoid the scum blockage bar-shaped net frame 209 lead to the collection of inharmonious phenomenon, when the scum into the bar-shaped net frame 209 inside, at this time the excess wastewater through the bar-shaped net frame 209 and filter screen 222 discharge, through the rotation of the rod 214 drive strip plate 223 rotation, strip plate 223 drive the brush plate 224 surface bristles to the filter screen 222, so as to effectively avoid the scum blockage filter screen 222 lead to the phenomenon of wastewater filtration inharmonious, and thus greatly improve the scum collection efficiency, bring convenience to the staff when using, through the first moving frame 205 and the second moving frame 207 drive the guide wheel 226 movement, at this time the guide wheel 226 located in the guide groove 225 inside the rolling connection, so that the first moving frame 205 and the second moving frame 207 move more stable;

[0031] Workers insert one end of the L-plate 212 into the connecting plate 211, and then pull the two sets of sliding rods 302 to slide inside the limiting frame 301. At this time, one end of the sliding rod 302 drives the baffle 305 to move, and the telescopic spring 306 extends. At this time, both ends of the baffle 305 slide outside the support rod 307. By tightening and loosening the sliding rod 302, and then through the restoring property of the telescopic spring 306, the sliding rod 302 can drive the slide plate 303 to quickly return to its original position, thereby allowing multiple sets of insert blocks 304 to be inserted into the L-plate 212. This achieves the effect of quickly fixing the limiting L-plate 212, which facilitates the quick replacement and cleaning of the strip mesh frame 209. It also makes it easier for workers to remove the floating scum inside the strip mesh frame 209, greatly improving the cleaning efficiency of the strip mesh frame 209 and bringing convenience to workers during use.

[0032] The prior art, including the treatment tank 1, baffle 101, water outlet pipe 102, and slag discharge port 103, discloses a scum removal device for a wastewater treatment tank. The device used is not described in detail here.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A scum skimming device for wastewater treatment, comprising a treatment tank (1), a partition (101) is internally installed at one end of the treatment tank (1), a water outlet pipe (102) is internally installed at one side of the bottom end of the treatment tank (1), and a residue discharge port (103) is installed at the end of the treatment tank (1) away from the water outlet pipe (102); characterized in that Further comprising: A cleaning mechanism (2) is arranged inside the treatment tank (1), and a fixing assembly (3) is arranged inside the cleaning mechanism (2); The cleaning mechanism (2) comprises a first sliding box (201) installed at one side of the top end of the treatment tank (1), a second sliding box (202) is installed at the side of the top end of the treatment tank (1) away from the first sliding box (201), a reciprocating screw rod (203) is rotatably connected inside the first sliding box (201), a first motor (204) is installed at one end of the reciprocating screw rod (203), a first moving frame (205) is threadedly connected to the outer side of the reciprocating screw rod (203), a fixing rod (206) is installed inside the second sliding box (202), a second moving frame (207) is slidably connected to the outer side of the fixing rod (206), a fixing plate (208) is installed between the top ends of the first moving frame (205) and the second moving frame (207), a strip-shaped net frame (209) is arranged at the bottom end of the fixing plate (208), an expansion frame (210) is installed at one end of the strip-shaped net frame (209), a connecting plate (211) is installed at the bottom end of the fixing plate (208), an L-shaped plate (212) is installed at one side of the top end of the strip-shaped net frame (209), and the L-shaped plate (212) is inserted between one end of the connecting plate (211).

2. The scum skimming device for wastewater treatment according to claim 1, characterized by: A fixing box (213) is installed at one end of the strip-shaped net frame (209), a rotating rod (214) is rotatably connected between the fixing box (213) and the strip-shaped net frame (209), a fan blade (215) is installed at the outer end of one end of the rotating rod (214), a supporting plate (216) is installed at one side of the bottom end of the strip-shaped net frame (209), a waterproof box (217) is installed at the bottom end of the supporting plate (216), a driving rod (218) is rotatably connected between the fixing box (213), the supporting plate (216) and the waterproof box (217), a second motor (219) is installed at the bottom end of the driving rod (218), a first rotating tooth (220) is installed at the top end of the driving rod (218), a second rotating tooth (221) is installed at one end of the rotating rod (214), the first rotating tooth (220) and the second rotating tooth (221) are meshingly connected, filter screens (222) are symmetrically installed inside one end of the strip-shaped net frame (209), a strip plate (223) is installed at the outer end of one end of the rotating rod (214), and a brush plate (224) is installed at one side of the strip plate (223).

3. The scum skimming device for wastewater treatment according to claim 1, characterized in that: The fixed assembly (3) comprises a limiting frame (301) symmetrically mounted inside the fixed plate (208), the inside of the limiting frame (301) is slidably connected with a sliding rod (302), the bottom end of the sliding rod (302) is mounted with a sliding plate (303), the bottom end of the sliding plate (303) is mounted with an insertion block (304), the insertion block (304) is inserted between the L-shaped plate (212), the outside of the sliding rod (302) is mounted with a baffle (305), the inside of the baffle (305) is mounted with a telescopic spring (306) between the limiting frame (301).

4. The scum skimming device for wastewater treatment according to claim 1, characterized by: The bottom end inside of the first sliding box (201) and the second sliding box (202) is provided with a guide groove (225), the bottom end of the first moving frame (205) and the second moving frame (207) is symmetrically rotatably connected with a guide wheel (226), the guide wheel (226) is rollingly connected with the guide groove (225).

5. The scum skimming device for wastewater treatment according to claim 3, characterized in that: The inside of the limiting frame (301) is symmetrically mounted with a supporting rod (307), the baffle (305) is slidably connected outside the supporting rod (307).

6. The scum skimming device for wastewater treatment according to claim 3, characterized in that: The telescopic spring (306) is sleeved outside the sliding rod (302).

7. The scum skimming device for wastewater treatment according to claim 2, characterized by: The second motor (219) is arranged inside the waterproof box (217).

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