Dosing device for quantitatively feeding sewage treatment chemicals

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a dosing device for quantitative dosing of sewage treatment chemicals. Comprising a main shaft and a supporting plate, the main shaft is erected in the center of a sewage treatment tank, and the outer ring of the sewage treatment tank is a floating foam tank; the supporting plate is connected to the top of the main shaft through a middle supporting sleeve, is free in the circumferential direction and is connected with a driving mechanism, and the driving mechanism drives the supporting plate to rotate around the sewage treatment tank by taking the main shaft as a fulcrum; a medicament barrel and a group of floating foam cleaning components are respectively arranged on two sides of the main shaft at the bottom of the supporting plate, floating foam inlets of the floating foam cleaning components are positioned in the range of the sewage treatment tank, and floating foam outlets of the floating foam cleaning components are positioned in the range of the floating foam tank; the dosing device for quantitatively feeding the sewage treatment medicament has the functions of stirring and mixing the medicament and uniformly feeding the medicament, and can be used for removing floating foam on the surface of a sewage treatment tank.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a dosing device for quantitatively dosing sewage treatment agents. Background Art

[0002] Modern sewage treatment technology can be divided into primary, secondary and tertiary treatment according to the degree of treatment. Primary treatment mainly removes suspended solid pollutants in sewage, and most physical treatment methods can only meet the requirements of primary treatment. After primary treatment, BOD can generally be removed by about 30%, which does not meet the discharge standard. Primary treatment is a pretreatment for secondary treatment. Secondary treatment mainly removes organic pollutants (BOD, COD substances) in colloidal and dissolved states in sewage, with a removal rate of more than 90%, so that organic pollutants meet the discharge standard. Tertiary treatment further treats difficult-to-degrade organic matter, nitrogen and phosphorus, and other soluble inorganic substances that can cause eutrophication of water bodies. The main methods include biological denitrification and phosphorus removal, coagulation and sedimentation, sand filtration, activated carbon adsorption, ion exchange and electroosmosis analysis.

[0003] In secondary treatment, dosing devices are often used to add flocculants to sewage for decontamination. Flocculants aggregate impurity particles and natural colloid particles in sewage into large flocs for precipitation or floating, thereby purifying sewage. There are many types of flocculants, and they need to be mixed during the addition process to improve the treatment effect of the agent on sewage.

[0004] In the process of spraying the chemicals, the existing dosing device does not uniformly dispense the chemicals, the mixing of multiple chemicals is not sufficient, and the effect of the chemicals after entering the sewage is poor. In addition, after long-term use of the sewage treatment pool, a large amount of floating foam will be generated in the pool due to various factors such as the amount of chemicals used, too long sludge age, or too high sludge load. If these floating foams are not cleaned up in time, the effect of sewage treatment will be affected. In the prior art, manual scooping is usually used to remove the floating foam, but the workers' work intensity is high, and they need to be salvaged frequently, which is not safe. In addition, when the sewage treatment pool is large, the floating foam in the center of the pool cannot be manually scooped out. Summary of the invention

[0005] The invention aims to solve the problems of uneven dosage of medicines and insufficient mixing of multiple medicines in the existing medicine adding device during the medicine spraying process.

[0006] The present invention provides the following technical solution: a dosing device for quantitatively dosing sewage treatment agents, comprising a main shaft and a support plate, wherein the main shaft is erected in the center of a sewage treatment pool, and the outer circle of the sewage treatment pool is a froth pool; The support plate is connected to the top of the main shaft through the middle support sleeve and is circumferentially free. The support plate is connected to the driving mechanism, and the driving mechanism drives the support plate to rotate around the sewage treatment tank with the main shaft as the fulcrum; A medicine barrel and a set of froth cleaning components are respectively arranged on both sides of the main shaft at the bottom of the support plate. The froth inlet of the froth cleaning component is located within the sewage treatment pool, and the froth outlet of the froth cleaning component is located within the froth pool.

[0007] Furthermore, a first rotatable threaded rod is arranged between the two end plates inside the medicine barrel, and the first threaded rod is connected to a second motor outside one of the end plates; a discharge plate is fixed to the two end plates of the medicine barrel close to the first threaded rod, and inner through holes are distributed on the discharge plate, and outer through holes are distributed on the two end plates of the medicine barrel, and when the first threaded rod rotates, the inner through holes and the outer through holes switch between connection and offset.

[0008] Furthermore, a movable sleeve is disposed outside the first threaded rod, a first ring frame and a second ring frame are fixed inside the movable sleeve, a threaded sleeve is fixedly nested inside the hole of the first ring frame, the threaded sleeve is threadedly screwed with the first threaded rod, a circumferentially free rotating ring is nested in the hole of the second ring frame, one end of the rotating ring located outside the movable sleeve is coaxially fixedly connected with the rotating sleeve, a guide block is disposed on the inner wall of the rotating sleeve, the first threaded rod passes through the rotating sleeve, and a guide groove adapted to the guide block is provided on the first threaded rod; stirring blades arranged in a circular array with the first threaded rod as the center are distributed on the rotating sleeve; A guide rod parallel to the first threaded rod is arranged between the two end plates in the medicine barrel, and the top of the movable sleeve is fixedly connected with the guide plate, which is slidably matched with the guide rod.

[0009] Furthermore, one end of the rotating ring located inside the movable sleeve is coaxially fixedly connected to the first bevel gear, and the movable sleeve has rotating shafts distributed in a circular array with the first threaded rod as the center, and the second bevel gear is fixed to the end of the rotating shaft located inside the movable sleeve, and the second bevel gear is meshed with the first bevel gear, and the stirring claw is fixed to the end of the rotating shaft located outside the movable sleeve.

[0010] Furthermore, the foam cleaning assembly includes a foam box, which has an opening on one side facing the rotation direction of the support plate, and an inclined plate is arranged in the opening to form an upward slope; a material guide cylinder is inserted from top to inside on the foam box, and a feed port at the lower part of the material guide cylinder is connected to the interior of the foam box, and a conveying pump is arranged on the material guide cylinder, and the suction port of the conveying pipe connected to the conveying pump extends to the feed port, and the discharge port extends to the foam pool.

[0011] Furthermore, the froth box is connected to the support plate through a lifting mechanism; the lifting mechanism includes a support plate, a third motor, a second threaded rod and a connecting plate; the support plate is fixed on the support plate, the connecting plate is fixed on the froth box, the third motor is installed on the top of the support plate, the second threaded rod is connected to the third motor and is screwed with the screw hole on the connecting plate, and the material guide barrel is movably passed through the gap of the support plate.

[0012] Furthermore, the foam cleaning assembly also includes an L-shaped rod, the horizontal rod of the L-shaped rod passes through the through slot on the medicine barrel and is connected to the guide plate, and the vertical rod of the L-shaped rod passes through the through slot on the foam box and is connected to the scraper, leaving space in the foam box for the scraper to move up and down.

[0013] Furthermore, the support plate extends to the outside of the froth pool and hangs a medicine storage tank, and a medicine delivery tube is connected between the medicine storage tank and the medicine barrel.

[0014] Furthermore, the driving mechanism of the support plate includes a limit plate, a first motor, a gear and a gear ring, the gear ring is fixed to the outer ring of the foam pool, the limit plate and the first motor are fixed to the support plate, the gear on the first motor is meshed with the gear ring, and the limit plate is slidably matched with the slide groove on the foam pool.

[0015] Further, the stirring claw includes a rotating head and a stirring rod around the rotating head.

[0016] Compared with the prior art, the advantages of the present invention are: When the first threaded rod rotates, it drives the guide block and the rotating sleeve to rotate. When the rotating sleeve rotates, it drives the rotating ring to rotate. When the rotating ring rotates, it drives the first bevel gear to rotate. When the first bevel gear rotates, it drives multiple second bevel gears to rotate. The rotating shaft rotates with the second bevel gears and causes the stirring claws to rotate, so that the stirring claws stir and mix multiple medicines when the moving sleeve moves, and push the medicines to both sides of the medicine barrel through the stirring blades on the rotating sleeve, so that the medicines are sprayed out from the through holes at both ends of the medicine barrel faster, thereby accelerating the efficiency of medicine delivery.

[0017] The first motors on both sides are started, and the first motors drive the gears to rotate. The gears roll on the gear rings to drive the support plate to rotate, and the medicine barrel and the foam cleaning assembly rotate synchronously. At the same time, the third motor is started to drive the second threaded rod to rotate. Since the second threaded rod is threadedly connected to the connecting plate, the rotation of the second threaded rod will push the connecting plate and the foam box to move up and down along the vertical rod direction of the L-shaped rod, thereby adjusting the height of the foam box from the liquid surface. This design allows the foam box to flexibly adapt to sewage liquid levels of different heights, ensuring the best foam collection effect. During the rotation of the foam box, the bottom edge of the inclined plate corresponds to the height of the foam, so that the foam is collected in the foam box.

[0018] When the foam box rises or falls, the scraper slides inside the foam box to exert a certain thrust on the foam inside the foam box, helping them move faster. At the same time, the sliding of the scraper can also scrape off the foam adhering to the inner wall of the foam box to prevent residue. In addition, after the delivery pump is started, the foam that enters the guide barrel is discharged from the delivery pipe. This design effectively solves the problem of foam accumulation inside the device and ensures the cleanliness and efficient operation of the device. The discharge of foam not only helps to improve the sewage treatment effect, but also prolongs the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the installation of a dosing device for quantitatively dosing of sewage treatment chemicals; Figure 2 A cross-sectional view of a dosing device for quantitatively dosing sewage treatment chemicals; Figure 3 is a schematic diagram of a medicine cartridge; Figure 4 is a schematic diagram of an L-shaped rod; Figure 5 is a schematic diagram of the interior of a medicine cartridge; Figure 6 is a schematic diagram of a first threaded rod; Figure 7 is a schematic diagram of the second ring frame; Figure 8 It is a schematic diagram of the interior of the mobile set; Fig. 9 is a schematic diagram of a rotating sleeve; Fig.10 A schematic diagram of a foam cleaning assembly; Fig.11 It is a schematic diagram of the guide barrel; Fig.12 Schematic diagram of the driving mechanism of the support plate.

[0020] In the figure: 1-sewage treatment tank; 2-floating tank; 3-main shaft; 4-support sleeve; 5-support plate; 501-limiting plate; 502-first motor; 503-gear; 504-gear ring; 6-medicine barrel; 601-wing plate; 602-first threaded rod; 603-moving sleeve; 604-first ring frame; 605-threaded sleeve; 606-second ring frame; 607-rotating ring; 608-rotating sleeve; 609-reinforcement rib; 610-blade; 611-guide block; 612-guide groove; 613-first bevel gear; 614-rotating shaft; 615-second bevel gear; 616-rotating head; 617-stirring rod; 618-guide plate; 619-guide rod; 620-discharging plate; 621-second motor; 7-floating cleaning assembly; 701- L-shaped rod; 702-scraper; 703-support plate; 704-third motor; 705-second threaded rod; 706-connecting plate; 707-inclined plate; 708-material guide cylinder; 709-feeding port; 710-delivery pump; 711-delivery pipe; 712-float tank; 8-drug storage tank; 801-drug delivery pipe. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] like Figure 1 , Figure 2 As shown: a dosing device for quantitatively dosing sewage treatment agents includes a main shaft 3 and a support plate 5. The main shaft 3 is erected in the center of a sewage treatment tank 1. The outer circle of the sewage treatment tank 1 is a froth pool 2. The sewage treatment tank 1 is circular, and the froth pool 2 is a concentric circle of the sewage treatment tank 1.

[0023] like Fig.12 As shown: the support plate 5 is connected to the top of the main shaft 3 through the middle support sleeve 4 and is circumferentially free. The support plate 5 is connected to the driving mechanism, and the driving mechanism drives the support plate 5 to rotate around the sewage treatment tank 1 with the main shaft 3 as the fulcrum; the driving mechanism of the support plate 5 includes a limit plate 501, a first motor 502, a gear 503 and a ring gear 504, the ring gear 504 is fixed to the outer ring of the foam pool 2, the limit plate 501 and the first motor 502 are fixed on the support plate 5, the gear 503 on the first motor 502 is meshed with the ring gear 504, the gear 503 rolls on the ring gear 504 to push the support plate 5 to rotate, the limit plate 501 slides with the slide groove on the foam pool 2 to reduce the shaking of the support plate 5 when it rotates.

[0024] A medicine barrel 6 and a group of foam cleaning components 7 are respectively arranged on both sides of the main shaft 3 at the bottom of the support plate 5. The foam inlet of the foam cleaning component 7 is located within the range of the sewage treatment tank 1, and the foam outlet of the foam cleaning component 7 is located within the range of the foam tank 2. The foam cleaning component 7 cleans the foam on the surface of the sewage treatment tank 1 into the foam tank 2.

[0025] like Figure 3 As shown: the medicine cartridge 6 is connected to the support plate 5 via the wing plate 601 at the top.

[0026] like Figure 5 As shown: a rotatable first threaded rod 602 is arranged between the two end plates inside the medicine barrel 6, the first threaded rod 602 is connected to a second motor 621 outside one of the end plates, and the second motor 621 can drive the first threaded rod 602 to rotate; a discharge plate 620 is fixed to the two end plates of the first threaded rod 602 close to the medicine barrel 6, the discharge plate 620 is provided with inner through holes, and the two end plates of the medicine barrel 6 are provided with outer through holes, when the first threaded rod 602 rotates, the inner through holes and the outer through holes are switched between connected and staggered, after the inner through holes on the discharge plate 620 and the outer through holes on the end plate are connected, the medicine in the medicine barrel 6 can flow out, and after the inner through holes on the discharge plate 620 and the outer through holes on the end plate are staggered, the medicine in the medicine barrel 6 cannot flow out.

[0027] like Figure 6 , Figure 7 , Figure 8 , Fig. 9 As shown in the figure: the first threaded rod 602 is covered with a movable sleeve 603, the movable sleeve 603 is fixed with a first ring frame 604 and a second ring frame 606, the hole of the first ring frame 604 is fixed with a threaded sleeve 605, the threaded sleeve 605 is screwed with the first threaded rod 602, the hole of the second ring frame 606 is embedded with a circumferentially free rotating ring 607, one end of the rotating ring 607 located outside the movable sleeve 603 is coaxially fixedly connected with a rotating sleeve 608, the rotating sleeve 608 and the rotating ring 607 rotate synchronously, the inner wall of the rotating sleeve 608 is provided with a guide block 611, the first threaded rod 602 is fixed with a threaded sleeve 605, and the first threaded rod 602 is screwed with the threaded sleeve 605. The rotating ring 607 is located outside the movable sleeve 603. The threaded rod 602 passes through the rotating sleeve 608. The first threaded rod 602 is provided with a guide groove 612 matched with the guide block 611. When the first threaded rod 602 rotates, the torque is transmitted to the rotating sleeve 608 through the guide groove 612 and the guide block 611; the rotating sleeve 608 is provided with stirring blades arranged in a circular array with the first threaded rod 602 as the center, and the stirring blades rotate to push the medicine in the medicine barrel 6 to move; the stirring blades include blades 610, and the blades 610 are provided with reinforcing ribs 609; the end of the blade 610 is in contact with the curved surface of the inner wall of the medicine barrel 6.

[0028] A guide rod 619 parallel to the first threaded rod 602 is provided between the two end plates in the medicine barrel 6, and a guide plate 618 is fixedly connected to the top of the movable sleeve 603. The guide plate 618 and the guide rod 619 are slidably matched, and the rotation of the movable sleeve 603 is limited by the guide plate 618 and the guide rod 619, so that when the first threaded rod 602 rotates, the angle of the threaded sleeve 605 is fixed, and the threaded sleeve 605 moves on the first threaded rod 602 to push the movable sleeve 603 to move, and the rotating sleeve 608 can rotate while moving with the movable sleeve 603.

[0029] like Figure 8 As shown: one end of the rotating ring 607 located inside the moving sleeve 603 is coaxially fixedly connected with the first bevel gear 613, and the moving sleeve 603 is provided with rotating shafts 614 distributed in a circular array with the first threaded rod 602 as the center, and one end of the rotating shaft 614 located inside the moving sleeve 603 is fixed with the second bevel gear 615, and the second bevel gear 615 is meshed with the first bevel gear 613, and the first bevel gear 613 drives the plurality of second bevel gears 615 to rotate synchronously, and the rotating shaft 614 rotates with the second bevel gear 615, and one end of the rotating shaft 614 located outside the moving sleeve 603 is fixed with a stirring claw. The stirring claw includes a rotating head 616 and a stirring rod 617 around the rotating head 616, and the stirring claw stirs the medicine to make the medicine mixed evenly.

[0030] The support plate 5 extends to the outside of the froth pool 2 and hangs a medicine storage tank 8 . A medicine delivery tube 801 is connected between the medicine storage tank 8 and the medicine barrel 6 , and medicine is supplied to the medicine barrel 6 through the medicine storage tank 8 and the medicine delivery tube 801 .

[0031] like Fig.10 , Fig.12 As shown: the foam cleaning component 7 includes a foam box 712, which has an opening on one side facing the rotation direction of the support plate 5, and an inclined plate 707 is arranged in the opening to form an upward slope, and the foam enters the foam box 712 along the slope, and the inclined plate 707 can prevent sewage from flowing into the foam box 712; a guide cylinder 708 is inserted from top to inside on the foam box 712, and a feed port 709 at the lower part of the guide cylinder 708 is connected to the inside of the foam box 712, and a delivery pump 710 is arranged on the guide cylinder 708, and a delivery pipe 711 connected to the delivery pump 710 has a suction port extending to the feed port 709 and a discharge port extending to the foam pool 2, and the foam in the foam box 712 flows into the guide cylinder 708 from the feed port 709, and the delivery pump 710 sucks the foam into the foam pool 2.

[0032] The froth box 712 is connected to the support plate 5 through a lifting mechanism; the lifting mechanism includes a support plate 703, a third motor 704, a second threaded rod 705 and a connecting plate 706; the support plate 703 is fixed on the support plate 5, the connecting plate 706 is fixed on the froth box 712, the third motor 704 is installed on the top of the support plate 703, the second threaded rod 705 is connected to the third motor 704, and is screwed with the screw hole on the connecting plate 706, the third motor 704 drives the second threaded rod 705 to rotate, and when the second threaded rod 705 rotates, the connecting plate 706 moves up and down on the second threaded rod 705, and moves the froth box 712 up and down. The position of the froth box 712 can be adjusted according to the liquid level, and the material guide cylinder 708 is movably passed through the gap of the support plate 5.

[0033] like Figure 4 , Figure 5 , Fig.10 As shown: the foam cleaning assembly 7 also includes an L-shaped rod 701, the horizontal rod of the L-shaped rod 701 passes through the through slot on the medicine barrel 6 and is connected to the guide plate 618, and the vertical rod of the L-shaped rod 701 passes through the through slot on the foam box 712 and is connected to the scraper 702; the guide plate 618 moves with the L-shaped rod 701 when the movable sleeve 603 moves, and the L-shaped rod 701 pushes the scraper 702 to move in the foam box 712, and the scraper 702 pushes the foam to move. There is space left in the foam box 712 for the scraper 702 to move up and down. When the foam box 712 moves up and down, the height of the L-shaped rod 701 remains unchanged, and the scraper 702 moves up and down in the foam box 712.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dosing device for quantitatively dosing of sewage treatment agents, characterized in that: It comprises a main shaft (3) and a support plate (5), wherein the main shaft (3) is erected at the center of a sewage treatment tank (1), and the outer circle of the sewage treatment tank (1) is a froth tank (2); The support plate (5) is connected to the top of the main shaft (3) via the middle support sleeve (4) and is circumferentially free. The support plate (5) is connected to a driving mechanism, and the driving mechanism drives the support plate (5) to rotate around the sewage treatment tank (1) with the main shaft (3) as a fulcrum. A medicine barrel (6) and a set of froth cleaning components (7) are respectively arranged on both sides of the main shaft (3) at the bottom of the support plate (5); the froth inlet of the froth cleaning component (7) is located within the range of the sewage treatment pool (1); and the froth outlet of the froth cleaning component (7) is located within the range of the froth pool (2).

2. A dosing device for quantitatively dosing of sewage treatment agents according to claim 1, characterized in that: A first threaded rod (602) capable of rotating is arranged between the two end plates in the medicine barrel (6), and the first threaded rod (602) is connected to a second motor (621) outside one of the end plates; a discharge plate (620) is fixed to the two end plates of the medicine barrel (6) on the first threaded rod (602), and inner through holes are distributed on the discharge plate (620); outer through holes are distributed on the two end plates of the medicine barrel (6); when the first threaded rod (602) rotates, the inner through holes and the outer through holes switch between being connected and staggered.

3. A dosing device for quantitatively dosing of sewage treatment agents according to claim 2, characterized in that: The first threaded rod (602) is covered with a movable sleeve (603), the movable sleeve (603) is fixed with a first ring frame (604) and a second ring frame (606), a threaded sleeve (605) is fixedly embedded in the hole of the first ring frame (604), the threaded sleeve (605) is threadedly screwed with the first threaded rod (602), a circumferentially free rotating ring (607) is embedded in the hole of the second ring frame (606), one end of the rotating ring (607) located outside the movable sleeve (603) is coaxially fixedly connected to a rotating sleeve (608), a guide block (611) is provided on the inner wall of the rotating sleeve (608), the first threaded rod (602) passes through the rotating sleeve (608), and a guide groove (612) adapted to the guide block (611) is provided on the first threaded rod (602); stirring blades are distributed on the rotating sleeve (608) and arranged in a circular array with the first threaded rod (602) as the center; A guide rod (619) parallel to the first threaded rod (602) is arranged between the two end plates in the medicine barrel (6). The top of the movable sleeve (603) is fixedly connected to a guide plate (618), and the guide plate (618) and the guide rod (619) are slidably matched.

4. A dosing device for quantitatively dosing of sewage treatment agents according to claim 3, characterized in that: One end of the rotating ring (607) located inside the moving sleeve (603) is coaxially fixedly connected to the first bevel gear (613); rotating shafts (614) are distributed in a circular array on the moving sleeve (603) with the first threaded rod (602) as the center; a second bevel gear (615) is fixed to one end of the rotating shaft (614) located inside the moving sleeve (603); the second bevel gear (615) is meshed with the first bevel gear (613); and a stirring claw is fixed to one end of the rotating shaft (614) located outside the moving sleeve (603).

5. A dosing device for quantitatively dosing of sewage treatment agents according to claim 3, characterized in that: The foam cleaning assembly (7) comprises a foam box (712), the foam box (712) having an opening on one side facing the rotation direction of the support plate (5), and an inclined plate (707) is arranged in the opening to form an upward slope; a material guide cylinder (708) is inserted from top to inside on the foam box (712), a feed inlet (709) at the lower part of the material guide cylinder (708) is connected to the inside of the foam box (712), a delivery pump (710) is arranged on the material guide cylinder (708), and a delivery pipe (711) connected to the delivery pump (710) has a suction port extending to the feed inlet (709), and a discharge port extending to the foam pool (2).

6. A dosing device for quantitatively dosing of sewage treatment agents according to claim 5, characterized in that: The froth box (712) is connected to the support plate (5) via a lifting mechanism; the lifting mechanism comprises a support plate (703), a third motor (704), a second threaded rod (705) and a connecting plate (706); the support plate (703) is fixed on the support plate (5), the connecting plate (706) is fixed on the froth box (712), the third motor (704) is mounted on the top of the support plate (703), the second threaded rod (705) is connected to the third motor (704) and is screwed into a screw hole on the connecting plate (706), and the material guide cylinder (708) is movably inserted into the notch of the support plate (5).

7. A dosing device for quantitatively dosing of sewage treatment agents according to claim 6, characterized in that: The foam cleaning assembly (7) further comprises an L-shaped rod (701), the horizontal rod of the L-shaped rod (701) passing through a through slot on the medicine barrel (6) to be connected to the guide plate (618), the vertical rod of the L-shaped rod (701) passing through a through slot on the foam box (712) to be connected to the scraper (702), and space is left in the foam box (712) for the scraper (702) to move up and down.

8. A dosing device for quantitatively dosing of sewage treatment agents according to claim 1, characterized in that: The support plate (5) extends to the outside of the froth pool (2) and is hung with a medicine storage tank (8), and a medicine delivery tube (801) is connected between the medicine storage tank (8) and the medicine barrel (6).

9. A dosing device for quantitatively dosing of sewage treatment agents according to claim 8, characterized in that: The driving mechanism of the support plate (5) comprises a limit plate (501), a first motor (502), a gear (503) and a gear ring (504); the gear ring (504) is fixed to the outer ring of the foam pool (2); the limit plate (501) and the first motor (502) are fixed to the support plate (5); the gear (503) on the first motor (502) meshes with the gear ring (504); the limit plate (501) and the slide groove on the foam pool (2) are slidably matched.

10. A dosing device for quantitatively dosing of sewage treatment agents according to claim 4, characterized in that: The stirring claw comprises a rotating head (616) and a stirring rod (617) around the rotating head (616).

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