A wastewater treatment dosing device

Abstract

The utility model discloses a wastewater treatment dosing device, including storage tank and mixing jar, storage tank includes the first box for storing powder, the conveying mechanism of first box body connection, the dissolving box of conveying mechanism connection, the first agitator of being located in the dissolving box, the drive mechanism of first agitator connection and the second box of being located in the first box body one side for storing liquid medicine, the dissolving box and second box all are equipped with the material mouth and gravity sensor, be equipped with first concentration sensor in the dissolving box, the mixing jar includes jar body, the second agitator of being located in jar body and the drive unit of second agitator connection, and jar body is equipped with a plurality of independent feed inlet for conveying various media, and the second concentration sensor and liquid level sensor are further equipped in the jar body, and the control box of being electrically connected with drive mechanism, drive unit, conveying mechanism and various sensors is equipped outside the dissolving box, makes powder and liquid medicine complete storage, dissolving, mixing and adding in the same set of equipment.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a wastewater treatment dosing device. Background Technology

[0002] In the treatment of industrial wastewater and municipal sewage, various chemicals need to be added to the wastewater to achieve water purification (such as coagulation, flocculation, disinfection, pH adjustment, etc.), including powder chemicals (such as polyaluminum chloride PAC, polyacrylamide PAM) and liquid chemicals (such as sodium hypochlorite, sulfuric acid, etc.). Traditional equipment is mostly designed for a single type of chemical (powder only or liquid only). If multiple chemicals need to be added, multiple independent equipment are required, resulting in complex systems, large footprints, and difficulty in achieving coordinated dosing control of different chemicals. Utility Model Content

[0003] In view of the technical problems existing in the prior art, this utility model provides a wastewater treatment dosing device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A wastewater treatment dosing device, comprising: A medicine storage box includes a first box for storing powdered medicine, a conveying mechanism connected to the first box, a dissolving box connected to the conveying mechanism, a first stirrer disposed in the dissolving box, a drive mechanism connected to the first stirrer for driving the first stirrer to work, and a second box disposed on one side of the first box for storing liquid medicine. A control box electrically connected to the drive mechanism and the conveying mechanism is disposed outside the dissolving box. Both the dissolving box and the second box are provided with a material inlet for controlling the inlet / outlet of liquid and a gravity sensor electrically connected to the control box. A first concentration sensor electrically connected to the control box is also disposed inside the dissolving box. The material inlet is connected to a solenoid valve for controlling the liquid delivery rate. A mixing tank includes a tank body, a second stirrer disposed within the tank body, and a drive unit connected to and used to drive the second stirrer. The tank body has several independent feed inlets for independently feeding liquid from the dissolving tank, water source, and liquid from the second tank into the tank body. The tank body also has a second concentration sensor electrically connected to a control box for detecting the concentration of the mixed solution and a liquid level sensor for detecting the liquid level. The tank body also has a gravity sensor electrically connected to the control box. The tank body uses a metering pump to dispose of the mixed solution into wastewater.

[0005] Furthermore, the feed inlet includes a first liquid inlet disposed on the dissolving tank for supplying water to the dissolving tank, a first liquid outlet communicating with the tank body, a second liquid inlet disposed on the second tank body for supplying medicine to the second tank body, and a second liquid outlet communicating with the tank body. The first liquid inlet, the first liquid outlet, the second liquid inlet, and the second liquid outlet are all connected to a solenoid valve for controlling the liquid supply volume. Each of the aforementioned feed ports is also connected to a corresponding solenoid valve to control the feed rate of the feed port.

[0006] Furthermore, the top of the first box is provided with a drug inlet for dispensing medicine, and a sealing cap for controlling the opening or closing of the drug inlet is hinged to the top of the drug inlet. The bottom of the first housing is equipped with a vibrator that can be electrically connected to the control box.

[0007] Furthermore, the first housing is equipped with a medicine pushing mechanism that can be electrically connected to the control box. The medicine pushing mechanism includes a medicine pushing plate disposed in the first housing, a connecting seat connected to the medicine pushing plate, a screw screwed to the connecting seat, a driven gear connected to the screw and distributed outside the first housing, a driving gear meshing with the driven gear, and a drive motor connected to the driving gear. The drive motor is electrically connected to the control box to drive the screw to rotate, thereby enabling the medicine pushing plate to reciprocate within the first housing. The top of the medicine pushing plate is provided with a moving wheel, and the medicine pushing plate is also connected to a guide rod to guide the movement of the medicine pushing plate.

[0008] Furthermore, the conveying mechanism is a screw metering conveyor, the inlet of which is connected to the drug outlet of the first box, and the end away from the drug outlet is provided with a drug delivery port that can deliver the drug into the dissolving box.

[0009] Furthermore, the second housing has a filling port at its top, and a top cover for controlling the opening or closing of the filling port is screwed onto the top of the filling port.

[0010] Furthermore, the first stirrer includes a stirring shaft connected to the drive mechanism and a stirring body connected to the stirring shaft. The stirring body includes a first stirring element, a second stirring element coaxially disposed below the first stirring element, and a plurality of stirring blades connected between the first stirring element and the second stirring element. All the stirring blades are evenly spaced around the center of the first stirring element, and a gradient channel is formed between every two adjacent stirring blades. The end of the gradient channel with the smallest cross-section is close to the center of the first stirring element.

[0011] Furthermore, the second stirrer includes two detachably connected stirring units, one of which is connected to the drive unit, and the structure of the stirring unit is the same as that of the first stirrer.

[0012] Furthermore, the tank is equipped with several rotating spray balls.

[0013] In summary, the beneficial effects of this utility model are as follows: 1. One set of equipment is compatible with the entire process of multiple agents: Through the integrated architecture of "first tank (powder storage) + dissolving tank (powder dissolution) + second tank (liquid agent storage) + mixing tank (multi-media mixing)," the entire process of "storage-dissolution-mixing-addition" of powders (such as PAC, PAM) and liquid agents (such as sodium hypochlorite) is covered, eliminating the need for multiple independent sets of equipment for different agents. Compared with traditional decentralized systems, this reduces costs and saves floor space. 2. The mixing tank ensures that multiple media are mixed in proportion through "gravity sensor (measuring the amount of each medium added) + second concentration sensor (measuring the concentration of the mixed solution)"; the discharge pipe of the conical hopper, combined with a metering pump, achieves precise addition of the mixed solution, improving agent utilization compared to traditional manual addition. 3. The control box links all sensors (gravity, concentration, liquid level) and actuators (stirrer, solenoid valve, metering pump, vibrator). From powder replenishment and dissolution stirring to mixing and precise dosing, everything is completed automatically according to the preset program without the need for manual operation, which can reduce manpower input. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a wastewater treatment dosing device provided by this utility model.

[0015] Figure 2 yes Figure 1 A cross-sectional view of the central medicine storage box.

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the stirring body in this utility model. Figure 1 .

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the stirring body in this utility model. Figure 2 .

[0018] Figure 5 This is a top view of the stirring body in this utility model.

[0019] Figure 6 yes Figure 5 Sectional view along the AA direction.

[0020] Figure 7 This is a front view of the stirring body in this utility model.

[0021] Figure 8 yes Figure 7 Sectional view along the BB direction.

[0022] Figure 9 This is a cross-sectional view of the second housing in this utility model.

[0023] Figure 10 This is a cross-sectional view of the mixing tank in this utility model.

[0024] In the diagram, 100-Medicine storage tank, 110-First tank body, 111-Medicine inlet, 112-Sealing cover, 113-Medicine outlet, 120-Conveying mechanism, 121-Inlet, 122-Medicine delivery port, 130-Dissolving tank, 131-Control box, 132-First liquid inlet, 133-First liquid outlet, 140-First stirrer, 141-Stirring shaft, 142-Stirring body, 142A-First stirring component, 142B-Second stirring component, 142C-Stirring blade, 142D-Gradual transition channel, 15 0-Drive mechanism, 160-Second box, 161-Filling port, 162-Top cover, 163-Second inlet, 164-Second outlet, 200-Mixing tank, 210-Tank body, 211-Conical hopper, 212-Discharge pipe, 220-Second agitator, 230-Drive unit, 300-Vibrator, 400-Pushing mechanism, 410-Pushing plate, 411-Moving wheel, 420-Connecting seat, 430-Screw, 440-Driven gear, 450-Driven gear, 460-Drive motor. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific figures.

[0026] Please see Figure 1 and Figure 2This utility model provides a wastewater treatment dosing device, including a storage tank 100 and a mixing tank 200. The storage tank 100 includes a first tank 110 for storing powdered drugs, a conveying mechanism 120 connected to the first tank 110, a dissolving tank 130 connected to the conveying mechanism 120, a first stirrer 140 disposed in the dissolving tank 130, a drive mechanism 150 connected to the first stirrer 140 for driving the first stirrer 140, and a second tank 160 disposed on one side of the first tank 110 for storing liquid drugs. A control box 131 electrically connected to the drive mechanism 150 and the conveying mechanism 120 is provided outside the dissolving tank 130. Both the dissolving tank 130 and the second tank 160 are provided with a material inlet for controlling the liquid inlet / outlet and a gravity sensor electrically connected to the control box 131. The dissolving tank 130 is also provided with a first concentration sensor electrically connected to the control box 131. A solenoid valve is connected to the material inlet for controlling the liquid delivery rate. The mixing tank 200 includes a tank body 210, a second agitator 220 disposed within the tank body 210, and a drive unit 230 connected to and used to drive the second agitator 220. The tank body 210 has several independent feed inlets for independently feeding liquid from the dissolving tank 130, water, and liquid from the second tank 160 into the tank body 210. The tank body 210 also contains a second concentration sensor electrically connected to the control box 131 for detecting the concentration of the mixture and a liquid level sensor for detecting the liquid level. The tank body 210 also contains a gravity sensor electrically connected to the control box 131. The tank body 210 dispenses the mixture into wastewater via a metering pump. Through the integrated design of the first tank 110 (powder storage), the dissolving tank 130 (powder dissolution), the second tank 160 (liquid drug storage), and the mixing tank 200 (multi-media mixing), the storage, dissolution, mixing, and dosing of powder and liquid drugs can be completed in the same set of equipment, eliminating the need for multiple independent devices, thus saving costs and floor space. This device uses the control box 131 to link all sensors (gravity, concentration, liquid level) and actuators (stirrer, solenoid valve, metering pump), achieving full automation from powder dissolution and liquid storage to multi-media mixing and dosing, requiring no manual intervention and offering simple and convenient operation.

[0027] Please continue reading. Figure 2 The first housing 110 has a drug inlet 111 at its top for adding the drug, and a sealing cover 112 is hinged to the top of the drug inlet 111 to control its opening and closing. The top drug inlet 111 facilitates the addition of powdered drug to the first housing 110 by manual or mechanical means (such as a hoist). The bottom of the first housing 110 is equipped with a pneumatic vibrator 300 that can be electrically connected to the control box 131. The addition of the pneumatic vibrator 300 can be used to break up powder bridging and agglomeration, ensuring smooth material feeding.

[0028] Please continue reading. Figure 2The first housing 110 is equipped with a medicine pushing mechanism 400 that can be electrically connected to the control box 131. The medicine pushing mechanism 400 includes a medicine pushing plate 410 disposed in the first housing 110, a connecting seat 420 connected to the medicine pushing plate 410, a screw 430 screwed to the connecting seat 420, a driven gear 440 connected to the screw 430 and distributed outside the first housing 110, a driving gear 450 meshing with the driven gear 440, and a drive motor 460 connected to the driving gear 450. The drive motor 460 is electrically connected to the control box 131 to drive the screw 430 to rotate, thereby enabling the medicine pushing plate 410 to reciprocate within the first housing 110. The top of the medicine pushing plate 410 is provided with a moving wheel 411, and the medicine pushing plate 410 is also connected to a guide rod to guide the movement of the medicine pushing plate 410. Powders (such as PAC and PAM) tend to accumulate in dead corners within the first housing 110 due to high inter-particle friction (especially in the corners of the first housing 110 or areas far from the discharge port 113), resulting in insufficient material intake by the conveying mechanism 120. The pusher plate 410, through reciprocating movement, can forcibly push the powder in the first housing 110 from areas far from the discharge port 113 to the inlet 121 of the conveying mechanism 120, ensuring that more powder can be effectively utilized and avoiding waste due to residue.

[0029] The conveying mechanism 120 is a screw metering conveyor. The inlet 121 of the screw metering conveyor is connected to the outlet 113 of the first housing 110. A delivery port 122, which allows the dispensing agent to be added into the dissolving tank 130, is located at the end furthest from the outlet 113. When the screw blades rotate, they exert a dual action of "pushing + stirring" on the powder, breaking up small-diameter clumps and preventing pipe blockage. The screw metering conveyor achieves quantitative conveying with controllable precision. The conveying capacity of the screw metering conveyor is proportional to the rotational speed of the screw 430 (adjusted by the control box 131 to adjust the speed of the drive motor 460). Combined with the uniform feeding of the first housing 110's pushing mechanism 400, accurate powder metering can be achieved.

[0030] Between the drug inlet 122 of the screw metering conveyor and the powder inlet of the dissolving tank 130, a sealing gate valve (preferably made of stainless steel, which is corrosion-resistant and has good sealing performance) is provided. The actuator of the gate valve (pneumatic cylinder or electric motor) is electrically connected to the control box 131 to form a working logic of "conveyor running → gate valve opening, conveyor stopping → gate valve closing" to prevent liquid in the dissolving tank 130 from entering the conveying mechanism 120.

[0031] Powdered pharmaceuticals (especially high molecular weight polymers such as PAM) have highly absorbent surfaces and require dissolution with water. The inlets include a first inlet 132 on the dissolving tank 130 for supplying water, a first outlet 133 connected to the tank body 210, a second inlet 163 on the second tank body 160 for supplying the pharmaceuticals into the second tank body 160, and a second outlet 164 connected to the tank body 210. Each of the first inlet 132, first outlet 133, second inlet 163, and second outlet 164 is connected to a solenoid valve for controlling the liquid flow rate. Several feed inlets are also connected to corresponding solenoid valves to control the feed rate. The design of the inlet and solenoid valve enables precise control of the two core flow paths in the dosing device: "water source—dissolving tank 130—mixing tank 200" and "liquid agent—second tank 160—mixing tank 200," by independently controlling the delivery path and flow rate of each liquid medium. Powdered agents need to be dissolved separately in the dissolving tank 130. Using only a gravity sensor (measuring the total weight of powder and water) and a first concentration sensor (measuring the actual concentration), the control box 131 can instruct the screw conveyor to precisely deliver the corresponding weight of powder. This allows for accurate calibration of the dissolution concentration, ensuring that the solution delivered to the mixing tank 200 has a stable concentration and is free of lumps, providing standard raw materials for accurate subsequent mixing ratios.

[0032] The medium in the dissolving tank 130 is mixed by a first stirrer 140. The first stirrer 140 includes a stirring shaft 141 connected to a drive mechanism 150 and a stirring body 142 connected to the stirring shaft 141. The drive mechanism 150 is preferably an electric motor. Please refer to [link to relevant documentation]. Figures 3-8 The stirring body 142 includes a first stirring element 142A, a second stirring element 142B coaxially disposed below the first stirring element 142A, and a plurality of stirring blades 142C connected between the first stirring element 142A and the second stirring element 142B. All stirring blades 142C are evenly spaced around the center of the first stirring element 142A. Please continue reading. Figure 8A gradient channel 142D is formed between every two adjacent stirring blades 142C. The end of the gradient channel 142D with the smallest cross-section is close to the center of the first stirring element 142A, resembling an arc. When the gradient channel 142D (with a cross-section that is smaller inside and larger outside) between adjacent stirring blades 142C rotates, it generates a special hydrodynamic effect: the inner side of the gradient channel 142D (closer to the stirring shaft 141, with a small cross-section) has a high flow velocity and low pressure, forming a "negative pressure suction" that draws water and incompletely dissolved powder particles from the bottom of the dissolving tank 130 into the gradient channel 142D; the outer side of the channel (away from the stirring shaft 141, with a large cross-section) has a slow flow velocity and high pressure, "pushing" the drawn-in mixture outward to the upper-middle region of the dissolving tank 130, forming a three-dimensional flow field of "up-down circulation + radial diffusion". This flow field can break the "colloidal coating" on the surface of the powder particles (avoiding the formation of "fish eyes"), while cutting and dispersing large clumps into fine particles. The dissolution efficiency is higher than that of ordinary straight blades, and the dissolution time can be shortened.

[0033] Please see Figure 9 The second housing 160 has a filling port 161 at its top, and a top cover 162 for controlling the opening and closing of the filling port 161 is screwed onto the top of the filling port 161. The filling port 161 can be connected to an automatic filling machine through a pipeline for batch replenishment of medicine (such as connecting to a medicine storage tank, without manual handling), and can also be manually opened in case of emergency (such as automatic filling machine failure) to quickly replenish medicine through a funnel or hose, avoiding interruption of wastewater treatment due to lack of medicine.

[0034] Qing Reference Figure 10 The second agitator 220 includes two screw-connected agitator units, one of which is connected to the drive unit 230. The structure of the agitator unit is the same as that of the first agitator 140. The drive unit 230 is preferably a motor. The upper agitator unit: uses the "inward suction and outward push" of the gradient channel to drive the flow of the upper light medium (such as water), preventing it from floating on the surface. The lower agitator unit: stirs the lower heavy medium (such as liquid reagents), preventing it from settling at the bottom of the tank 210. Together, they form a three-dimensional flow field covering the entire height of the tank 210, improving mixing uniformity and quickly eliminating media stratification.

[0035] Several rotating spray balls (not shown in the figure) are installed inside the tank 210. These balls are driven to rotate by water pressure, simultaneously spraying high-pressure water from multiple nozzles on their walls. The water flow covers the inner wall of the tank 210, the agitator blades, the sensor surface, and the corners of the tank bottom, effectively washing away residual chemical crystals, clumps, or adhering layers (such as PAM colloid residue), far exceeding the effectiveness of manual rinsing. Regular cleaning with the spray balls removes corrosive residues and extends the lifespan of the inner wall of the tank 210, the agitator unit, and the sensors.

[0036] Please continue reading. Figure 10The conical hopper 211 of tank 210 has a discharge pipe 212 at its bottom, equipped with a metering pump (for precise dosage control) and a check valve (to prevent wastewater backflow). The conical hopper 211 at the bottom of tank 210 causes the mixed liquid to converge towards the center due to gravity. The discharge pipe 212 connects directly to the lowest point of the conical hopper 211, allowing for almost complete discharge of the mixed liquid from the tank, preventing sedimentation at the bottom. When the mixed liquid is added to the wastewater system through the discharge pipe 212, backflow may occur if the wastewater system pressure fluctuates (e.g., water hammer caused by pump start-stop, or the wastewater level in the pool being higher than that in mixing tank 200). The check valve automatically closes under backflow pressure, completely preventing wastewater from entering the discharge pipe 212 and mixing tank 200. If wastewater (containing pollutants and microorganisms) enters mixing tank 200, it will contaminate the clean mixed liquid inside, causing the reagent to become ineffective, or even clogging the agitator and sensors, leading to equipment malfunction.

[0037] This dosing device features: 1. One system compatible with multiple reagents throughout the entire process: Through an integrated architecture of "first tank 110 (powder storage) + dissolving tank 130 (powder dissolution) + second tank 160 (liquid reagent storage) + mixing tank 200 (multi-media mixing)," it achieves full coverage of the "storage-dissolution-mixing-dosing" process for powders (such as PAC, PAM) and liquids (such as sodium hypochlorite). This eliminates the need for multiple independent systems for different reagents, reducing costs and saving floor space compared to traditional decentralized systems. 2. The mixing tank 200 uses a "gravity sensor (to measure the amount of each medium added) + a second concentration sensor (to measure the concentration of the mixed solution)" to ensure proportional mixing of multiple media. The discharge pipe 212 of the conical hopper 211, combined with a metering pump, enables precise dosing of the mixed solution, improving reagent utilization compared to traditional manual dosing. 3. The control box 131 links all sensors (gravity, concentration, liquid level) and actuators (stirring, solenoid valve, metering pump, vibrator 300). From powder replenishment and dissolution stirring to mixing and precise addition, everything is completed automatically according to the preset program without the need for manual operation, which can reduce manpower input.

[0038] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.

Claims

1. A wastewater treatment dosing device, characterized in that, include: A medicine storage box includes a first box for storing powdered medicine, a conveying mechanism connected to the first box, a dissolving box connected to the conveying mechanism, a first stirrer disposed in the dissolving box, a drive mechanism connected to the first stirrer for driving the first stirrer to work, and a second box disposed on one side of the first box for storing liquid medicine. A control box electrically connected to the drive mechanism and the conveying mechanism is disposed outside the dissolving box. Both the dissolving box and the second box are provided with a material inlet for controlling the inlet / outlet of liquid and a gravity sensor electrically connected to the control box. A first concentration sensor electrically connected to the control box is also disposed inside the dissolving box. The material inlet is connected to a solenoid valve for controlling the liquid delivery rate. A mixing tank includes a tank body, a second stirrer disposed within the tank body, and a drive unit connected to and used to drive the second stirrer. The tank body has several independent feed inlets for independently feeding liquid from the dissolving tank, water source, and liquid from the second tank into the tank body. The tank body also has a second concentration sensor electrically connected to a control box for detecting the concentration of the mixed solution and a liquid level sensor for detecting the liquid level. The tank body also has a gravity sensor electrically connected to the control box. The tank body uses a metering pump to dispose of the mixed solution into wastewater.

2. The wastewater treatment dosing device according to claim 1, characterized in that: The feed inlet includes a first inlet located on the dissolving tank for supplying water to the dissolving tank, a first outlet connected to the tank body, a second inlet located on the second tank body for supplying medicine to the second tank body, and a second outlet connected to the tank body. The first inlet, the first outlet, the second inlet, and the second outlet are all connected to a solenoid valve for controlling the liquid supply volume. Each of the aforementioned feed ports is also connected to a corresponding solenoid valve to control the feed rate of the feed port.

3. The wastewater treatment dosing device according to claim 2, characterized in that: The top of the first box is provided with a medicine inlet for dispensing medicine, and a sealing cap for controlling the opening or closing of the medicine inlet is hinged to the top of the medicine inlet; The bottom of the first housing is equipped with a vibrator that can be electrically connected to the control box.

4. The wastewater treatment dosing device according to claim 3, characterized in that: The first housing is equipped with a medicine pushing mechanism that can be electrically connected to the control box. The medicine pushing mechanism includes a medicine pushing plate disposed in the first housing, a connecting seat connected to the medicine pushing plate, a screw screwed to the connecting seat, a driven gear connected to the screw and distributed outside the first housing, a driving gear meshing with the driven gear, and a drive motor connected to the driving gear. The drive motor is electrically connected to the control box to drive the screw to rotate, thereby enabling the medicine pushing plate to reciprocate within the first housing. The top of the medicine pushing plate is provided with a moving wheel, and the medicine pushing plate is also connected to a guide rod to guide the movement of the medicine pushing plate.

5. The wastewater treatment dosing device according to claim 1, characterized in that: The conveying mechanism is a spiral metering conveyor. The inlet of the spiral metering conveyor is connected to the drug outlet of the first box, and the end away from the drug outlet is provided with a drug delivery port that can deliver the drug into the dissolving box.

6. The wastewater treatment dosing device according to claim 1, characterized in that: The second box has a filling port at the top, and a top cover for controlling the opening or closing of the filling port is screwed to the top of the filling port.

7. The wastewater treatment dosing device according to claim 1, characterized in that: The first stirrer includes a stirring shaft connected to the drive mechanism and a stirring body connected to the stirring shaft. The stirring body includes a first stirring element, a second stirring element coaxially disposed below the first stirring element, and a plurality of stirring blades connected between the first stirring element and the second stirring element. All the stirring blades are evenly spaced around the center of the first stirring element, and a gradient channel is formed between every two adjacent stirring blades. The end of the gradient channel with the smallest cross-section is close to the center of the first stirring element.

8. The wastewater treatment dosing device according to claim 7, characterized in that: The second stirrer includes two detachably connected stirring units, one of which is connected to the drive unit, and the structure of the stirring unit is the same as that of the first stirrer.

9. The wastewater treatment dosing device according to any one of claims 1-8, characterized in that: The tank is equipped with several rotating spray balls.

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