A multi-treatment device for food processing wastewater

Abstract

The application relates to a multiple treatment device for food processing sewage and belongs to the technical field of sewage treatment. The multiple treatment device for food processing sewage comprises a stirrer, a precipitator and a sterilizer, the precipitator is arranged between the stirrer and the sterilizer, a quantitative dosing mechanism is fixedly connected and communicated with the feeding end of the stirrer; the quantitative dosing mechanism comprises a water inlet pipe fixedly connected and communicated with the feeding end of the stirrer, a material guide box is fixedly connected and communicated with the surface of the water inlet pipe, and a storage barrel is fixedly connected to the surface of the material guide box. The water flow is used to drive the quantitative mixing of the cleaning composite coagulant into the food sewage, the cleaning composite coagulant can be quantitatively added according to the treatment amount of the food sewage, the existing multiple treatment device for food processing sewage cannot control the dosage of the cleaning composite coagulant, and the difficulty of food sewage treatment is increased.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a multi-stage treatment device for food processing wastewater. Background Technology

[0002] The purpose of multi-stage treatment of food processing wastewater is to effectively remove pollutants such as organic matter, suspended solids, nitrogen, and phosphorus from wastewater, ensuring that the water quality meets discharge standards and protecting the environment. The process typically includes: primary treatment, which removes larger suspended solids and floating matter through screens and equalization tanks; secondary treatment, which involves adding coagulants to aggregate fine suspended particles into larger particles, followed by solid-liquid separation in sedimentation tanks to remove suspended solids and some organic matter; and tertiary treatment, which further purifies the water through filtration and disinfection.

[0003] Chinese patent discloses a wastewater separation and treatment device for food processing plants (authorization announcement number CN211198894U). In use, the device is first installed on a stable surface and connected to an external power source. An appropriate amount of a cleaning compound coagulant is injected into the dosing device, followed by the wastewater being poured into a mixing tank. After pressing the control switch, the dosing device begins operation, injecting the cleaning compound coagulant into the mixing tank. Simultaneously, a servo motor drives the stirring blades to rotate, ensuring thorough mixing of the wastewater and the cleaning compound coagulant. Then, a first water pump introduces the wastewater into a sedimentation tank, where emulsified oil and colloids coagulate and settle. The wastewater is then rapidly separated through filtration by an upper screen plate. After the grease settles, the lower screen plate adsorbs other pollutants. When the wastewater is introduced into an ultraviolet sterilizer by a second water pump, the ultraviolet sterilizer sterilizes the wastewater, further improving the device's treatment efficiency. Finally, the wastewater is discharged through one side of the ultraviolet sterilizer and can also be connected to a water pipe for further purification.

[0004] Because the dosing device used above injects the cleaning compound coagulant inside directly into the mixing tank, it is difficult to control the amount of chemical added to the mixing tank. Adding too much chemical may cause other water pollution, while adding too little chemical will affect the wastewater treatment effect and increase the difficulty of food wastewater treatment. Summary of the Invention

[0005] Therefore, it is necessary to provide a multi-stage treatment device for food processing wastewater to address the problem that existing multi-stage treatment devices for food processing wastewater have difficulty controlling the dosage of the added cleaning compound coagulant, which increases the difficulty of food wastewater treatment.

[0006] A multi-stage treatment device for food processing wastewater includes a stirrer, a sedimentation tank, and a sterilizer. The sedimentation tank is located between the stirrer and the sterilizer. The feed end of the stirrer is fixedly connected to and communicates with a quantitative dosing mechanism.

[0007] Furthermore, the quantitative dosing mechanism includes a water inlet pipe fixedly connected to and communicating with the feed end of the agitator. A guide box is fixedly connected to and communicating with the surface of the water inlet pipe. A storage tank is fixedly connected to the surface of the guide box. A feed inlet located inside the storage tank is opened on the surface of the guide box. A fan-shaped partition is slidably connected inside the guide box. The notch of the fan-shaped partition is staggered with the feed inlet. An outer fan impeller is rotatably connected to both the inner top wall and the inner bottom wall of the guide box. Two outer fan impellers are interlocked.

[0008] In one embodiment, a water flow-driven method is used to quantitatively mix a cleaning compound coagulant into the food wastewater. This allows for the quantitative addition of the cleaning compound coagulant based on the volume of food wastewater to be treated, addressing the problem that existing multi-treatment devices for food processing wastewater have difficulty controlling the dosage of the added cleaning compound coagulant, leading to increased difficulty in food wastewater treatment.

[0009] Furthermore, each of the two outer fan impellers has an installation cavity at its opposite end. The quantitative dosing mechanism also includes an adjustment component. The adjustment component includes a threaded rod threaded to the bottom of the storage tank. The top of the threaded rod passes through the storage tank and extends into the interior of the lower installation cavity. A rotating shaft is rotatably connected to the top of the threaded rod. The top of the rotating shaft passes through the lower installation cavity and the fan-shaped partition in sequence and extends into the interior of the upper installation cavity. Two inner fan impellers are fixedly connected to the surface of the rotating shaft and are respectively inserted into the two installation cavities. The two inner fan impellers are symmetrically distributed on both sides of the fan-shaped partition.

[0010] In one embodiment, the regulating component not only allows staff to accurately adjust the dosage of the cleaning compound coagulant to meet the treatment needs of different types of wastewater, but also separates the cleaning compound coagulant in the storage tank from the wastewater inside the feed box, preventing wastewater from flowing into the storage tank and causing the cleaning compound coagulant to clump, thereby ensuring that the cleaning compound coagulant can be effectively added to the wastewater in the process.

[0011] Furthermore, the inner top wall of the feed box has a circular cavity, and the upper outer fan impeller penetrates into the interior of the circular cavity. The quantitative dosing mechanism also includes a vibration component, which includes a spring and a striking block. The spring is fixedly connected to the interior of the circular cavity, and the striking block is fixedly connected to the surface of the upper outer fan impeller. The shortest distance between the spring and the axis of the upper outer fan impeller is less than the maximum distance between the striking block and the axis of the upper outer fan impeller.

[0012] In one embodiment, the vibration assembly, driven by the rotation of the upper outer fan impeller, can vibrate and guide the cleaning compound coagulant inside the storage tank into the gap of the upper outer fan impeller. This not only ensures that the upper outer fan impeller can guide a sufficient amount of cleaning compound coagulant at a time, but also avoids the cleaning compound coagulant from "bridging". At the same time, the generated vibration force can also guide the cleaning compound coagulant above the fan-shaped partition gap to fall down, ensuring that the cleaning compound coagulant can be effectively added to the food wastewater passing through. Meanwhile, the staff can judge the usage of the cleaning compound coagulant in the storage tank by the loudness of the knocking sound transmitted to the outside, so as to add the cleaning compound coagulant in a timely manner. After the food wastewater is transported, the vibration assembly can also accelerate the resistance of the rotation of the outer fan impeller, which can speed up the rate at which the outer fan impeller stops guiding the cleaning compound coagulant, thereby reducing the waste of the cleaning compound coagulant.

[0013] Furthermore, a bearing is embedded in the top of the threaded rod, and the bearing is embedded in the bottom of the rotating shaft.

[0014] In one embodiment, this reduces the resistance of the threaded rod lifting shaft, making it easier to adjust.

[0015] Furthermore, an adjusting rod is fixedly connected to the bottom of the threaded rod, and the adjusting rod is perpendicular to the threaded rod.

[0016] In one embodiment, this makes it easier for the operator to rotate the threaded rod in the corresponding direction, further reducing the operator's adjustment burden.

[0017] Furthermore, the number of the spring pieces is not less than ten, and the spring pieces are fixedly connected in a ring around the axis of the upper outer fan impeller inside the circular cavity. The horizontal cross-sectional shape of the spring pieces is U-shaped, and the opening of the cross-section of the spring pieces faces away from the axis of the upper outer fan impeller.

[0018] In one embodiment, this can increase the vibrational force generated by the tapping to enhance the effect of the vibration.

[0019] Furthermore, the inside of the guide box is provided with a vertical groove, and a guide block that is fixedly connected to the fan-shaped partition is slidably connected inside the vertical groove.

[0020] In one embodiment, this prevents the sector-shaped baffle from rotating with the shaft, ensuring that the sector-shaped baffle can properly separate the sewage and the cleaning compound coagulant.

[0021] Furthermore, a rubber sealing block is embedded inside the vertical groove, and the rubber sealing block wraps around the surface of the guide block.

[0022] In one embodiment, this can elastically fill the gap between the vertical channel and the guide block, preventing sewage and cleaning compound coagulant from entering the vertical channel.

[0023] Furthermore, the two openings of the water inlet pipe and the guide box are both located on one side of the axis of the outer fan impeller below, and the lowest point of the two openings of the water inlet pipe and the guide box is lower than the inner bottom wall of the guide box.

[0024] In one embodiment, this enables unidirectional pushing of the lower outer fan impeller to ensure that the clean composite coagulant can be properly discharged.

[0025] The aforementioned multi-stage treatment device for food processing wastewater uses a water flow-driven method to quantitatively mix a cleaning compound coagulant into the food wastewater it passes through. This allows for the quantitative addition of the cleaning compound coagulant based on the volume of food wastewater to be treated, thus addressing the problem that existing multi-stage treatment devices for food processing wastewater have difficulty controlling the dosage of the added cleaning compound coagulant, leading to increased difficulty in food wastewater treatment.

[0026] The regulating component not only allows staff to accurately adjust the dosage of the cleaning compound coagulant to meet the treatment needs of different types of wastewater, but also separates the cleaning compound coagulant in the storage tank from the wastewater inside the feed box, preventing wastewater from flowing into the storage tank and causing the cleaning compound coagulant to clump, thus ensuring that the cleaning compound coagulant can be effectively added to the wastewater in the process.

[0027] Driven by the rotation of the upper outer fan impeller, the vibration component guides the cleaning compound coagulant inside the storage tank into the gap of the upper outer fan impeller. This not only ensures that the upper outer fan impeller can guide a sufficient amount of cleaning compound coagulant at a time, but also prevents the cleaning compound coagulant from "bridging". At the same time, the generated vibration force can also guide the cleaning compound coagulant above the fan-shaped partition notch to fall down, ensuring that the cleaning compound coagulant can be effectively added to the food wastewater passing through. Meanwhile, the staff can judge the usage of the cleaning compound coagulant in the storage tank by the loudness of the knocking sound transmitted to the outside, so as to add the cleaning compound coagulant in a timely manner. After the food wastewater is transported, the vibration component can also accelerate the rotation resistance of the outer fan impeller, which can speed up the rate at which the outer fan impeller stops guiding the cleaning compound coagulant, thereby reducing the waste of the cleaning compound coagulant. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a cross-sectional schematic diagram of the overall structure of the present invention;

[0031] Figure 3 This is a cross-sectional schematic diagram of the quantitative drug dispensing mechanism of the present invention;

[0032] Figure 4 This is a partial cutaway schematic diagram of the quantitative drug dispensing mechanism of the present invention;

[0033] Figure 5 This is a horizontal cross-sectional view of a portion of the quantitative drug dispensing mechanism of the present invention;

[0034] Figure 6 This is a vertical cross-sectional view of a portion of the quantitative drug dispensing mechanism of the present invention;

[0035] Figure 7 This is a horizontal cross-sectional schematic diagram of the water inlet pipe, feed box, outer fan impeller and rotating shaft of the present invention;

[0036] Figure 8 This is an exploded view of a partial structure of the quantitative drug dosing mechanism of the present invention.

[0037] Figure label:

[0038] 100. Agitator; 200. Sedimenter; 300. Sterilizer; 400. Dosing mechanism; 410. Water inlet pipe; 420. Feed box; 421. Feed inlet; 422. Circular cavity; 423. Vertical trough; 430. Storage tank; 440. Fan-shaped partition; 450. Outer fan impeller; 451. Mounting cavity; 460. Adjusting assembly; 461. Threaded rod; 462. Rotating shaft; 463. Inner fan impeller; 464. Bearing; 465. Adjusting rod; 470. Vibration assembly; 471. Spring; 472. Striking block; 480. Guide block; 490. Rubber sealing block. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0044] The following is combined with Figure 1 - Figure 8 The present invention describes a multi-stage treatment apparatus for food processing wastewater.

[0045] In one embodiment, a multi-stage treatment device for food processing wastewater includes a stirrer 100, a sedimentation tank 200, and a sterilizer 300. The sedimentation tank 200 is disposed between the stirrer 100 and the sterilizer 300. The feed end of the stirrer 100 is fixedly connected to and communicates with a quantitative dosing mechanism 400.

[0046] The inlet end of the water inlet pipe 410 is connected to a first delivery pump. The agitator 100 includes a first cylinder. The water inlet pipe 410 is connected to the surface of the first cylinder. The top of the first cylinder is fixedly connected to a mixer. The bottom of the mixer extends into the interior of the first cylinder. A PLC controller is fixedly connected to the surface of the first cylinder. A second delivery pump is connected to the bottom wall of the first cylinder. One end of the second delivery pump is connected to the second cylinder. A coarse filter screen and a fine filter screen are installed sequentially from top to bottom inside the second cylinder. Two electric drain valves are connected to the surface of the second cylinder. The two electric drain valves are aligned with the lowest points of the coarse filter screen and the fine filter screen, respectively. The sterilizer 300 is connected to the lowest point of the second cylinder.

[0047] The first conveying pump is manually controlled to input food wastewater into the inlet pipe 410. The food wastewater is mixed with the cleaning compound coagulant through the inlet pipe 410 and introduced into the first cylinder. The mixer is manually controlled to rotate and mix the cleaning compound coagulant and food wastewater together. After the cleaning compound coagulant and food wastewater are evenly mixed, the second conveying pump is manually controlled to input water and suspended solids into the second cylinder. The coarse filter screen first filters out the larger suspended solids in the water, and the fine filter screen then filters out the smaller suspended solids in the water. The filtered water enters the sterilizer 300 through the second cylinder for sterilization treatment. Finally, the treated water is discharged from the sterilizer 300.

[0048] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the quantitative dosing mechanism 400 includes a water inlet pipe 410 fixedly connected and connected to the feed end of the agitator 100. A guide box 420 is fixedly connected and connected to the surface of the water inlet pipe 410. A storage tank 430 is fixedly connected to the surface of the guide box 420. A feed inlet 421 is provided on the surface of the guide box 420 and disposed inside the storage tank 430. A fan-shaped partition 440 is slidably connected inside the guide box 420. The notch of the fan-shaped partition 440 is staggered with the feed inlet 421. An outer fan impeller 450 is rotatably connected to both the inner top wall and the inner bottom wall of the guide box 420. The two outer fan impellers 450 are inserted into each other. The two openings of the water inlet pipe 410 and the guide box 420 are both located on one side of the axis of the lower outer fan impeller 450. The lowest point of the two openings of the water inlet pipe 410 and the guide box 420 is lower than the inner bottom wall of the guide box 420.

[0049] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, each of the two outer fan impellers 450 has an installation cavity 451 at its opposite end. The metering dosing mechanism 400 also includes an adjustment assembly 460. The adjustment assembly 460 includes a threaded rod 461 threadedly connected to the bottom of the storage tank 430. The top of the threaded rod 461 passes through the storage tank 430 and extends into the interior of the lower installation cavity 451. A rotating shaft 462 is rotatably connected to the top of the threaded rod 461. The top of the rotating shaft 462 passes through the lower installation cavity 451 and the fan-shaped partition 440 in sequence and extends into the interior of the upper installation cavity 451. Two rods are fixedly connected to the surface of the rotating shaft 462 and are respectively inserted into the two installation cavities 451. The inner fan impeller 463 is connected, and the two inner fan impellers 463 are symmetrically distributed on both sides of the fan-shaped partition 440; the top of the threaded rod 461 is embedded with a bearing 464, which is embedded in the bottom of the rotating shaft 462; the bottom of the threaded rod 461 is fixedly connected with an adjusting rod 465, which is perpendicular to the threaded rod 461; the inside of the guide box 420 is provided with a vertical groove 423, and a guide block 480 fixedly connected to the fan-shaped partition 440 is slidably connected inside the vertical groove 423; a rubber sealing block 490 is embedded inside the vertical groove 423, and the rubber sealing block 490 is wrapped around the surface of the guide block 480;

[0050] When the dosage of the clean composite coagulant needs to be adjusted, the operator simply rotates the threaded rod 461 in the corresponding direction. The threaded rod 461 drives the rotating shaft 462 to rise and fall, and the rotating shaft 462 simultaneously drives the two inner fan impellers 463 to rise and fall. The two inner fan impellers 463 cooperate with the raising and lowering of the fan-shaped baffle 440. During this process, the distance between the upper outer fan impeller 450 and the fan-shaped baffle 440 decreases or increases accordingly. At this time, the volume of the groove formed by the upper outer fan impeller 450, the upper inner fan impeller 463, and the fan-shaped baffle 440 decreases or increases accordingly. To achieve the purpose of quantitatively adjusting the amount of cleaning compound coagulant added, the inner fan impeller 463 below moves up and down in conjunction with the fan-shaped baffle 440. This effectively seals the gap between the outer fan impeller 450 above and the fan-shaped baffle 440, thereby reducing the probability that water will rush into the storage tank 430 along the outer fan impeller 450 and the fan-shaped baffle 440 due to excessive water pressure inside the guide box 420. This ensures the dryness of the cleaning compound coagulant inside the storage tank 430, thereby reducing the difficulty of adding the cleaning compound coagulant.

[0051] like Figure 5 , Figure 6 and Figure 8As shown, the inner top wall of the feed box 420 has a circular cavity 422, and the upper outer fan impeller 450 penetrates into the interior of the circular cavity 422. The quantitative dosing mechanism 400 also includes a vibration component 470, which includes a spring 471 and a striking block 472. The spring 471 is fixedly connected to the interior of the circular cavity 422, and the striking block 472 is fixedly connected to the surface of the upper outer fan impeller 450. The shortest distance between the spring 471 and the axis of the upper outer fan impeller 450 is less than the maximum distance between the striking block 472 and the axis of the upper outer fan impeller 450. There are no fewer than ten springs 471, and the springs 471 are fixedly connected in a ring around the axis of the upper outer fan impeller 450 inside the circular cavity 422. The horizontal cross-sectional shape of the spring 471 is U-shaped, and the opening of the cross-section of the spring 471 faces away from the axis of the upper outer fan impeller 450.

[0052] During the rotation of the upper outer fan impeller 450, the upper outer fan impeller 450 drives the striking block 472 to rotate and strike the spring 471. At this time, both the guide box 420 and the storage tank 430 vibrate. This not only guides the cleaning compound coagulant inside the storage tank 430 to the gap of the upper outer fan impeller 450, but also guides the cleaning compound coagulant above the notch of the fan-shaped partition 440 to fall down, so as to ensure that the cleaning compound coagulant can be effectively added into the food wastewater that passes through.

[0053] When the cleaning composite coagulant inside the storage tank 430 covers and buries the material guide box 420, the cleaning composite coagulant can also prevent the sound from being knocked outward. Based on this, the staff can judge the usage of the cleaning composite coagulant inside the storage tank 430 according to the loudness of the knocking sound transmitted from the outside, so that the staff can add the cleaning composite coagulant in time.

[0054] When the delivery of food wastewater into the inlet pipe 410 is stopped, the lower outer fan impeller 450 loses thrust, and the spring plate 471 increases the rotational resistance of the upper outer fan impeller 450 by elastically pressing against the striking block 472. The upper outer fan impeller 450 prevents the lower outer fan impeller 450 from rotating through the adjusting component 460. This can accelerate the rate at which the outer fan impeller 450 stops guiding the cleaning compound coagulant, thereby reducing the waste of the cleaning compound coagulant.

[0055] Working principle: As food wastewater passes through the inlet pipe 410, it is blocked by the lower outer fan impeller 450. The food wastewater impacts the lower outer fan impeller 450, which, through the adjusting component 460, drives the upper outer fan impeller 450 to rotate. The upper outer fan impeller 450 quantitatively pushes the cleaning compound coagulant from the storage tank 430 into the guide box 420. When the cleaning compound coagulant is placed above the notch of the fan-shaped partition 440, it falls unobstructed into the gap between the lower outer fan impellers 450. The lower outer fan impeller 450, in conjunction with the guide box 420, mixes the cleaning compound coagulant with the passing food wastewater, thus adding a quantitative amount of cleaning compound coagulant to a quantitative amount of food wastewater, reducing the difficulty of food wastewater treatment.

[0056] It should be noted that the first delivery pump, mixer, PLC controller, electric drain valve, and sterilizer 300 mentioned above are all devices with relatively mature existing technology. The specific models can be selected according to actual needs. At the same time, the first delivery pump, mixer, PLC controller, electric drain valve, and sterilizer 300 can be powered by the built-in power supply or by the mains power. The specific power supply method should be selected according to the situation, and will not be elaborated here.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above embodiments are merely illustrative of several implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A multi-stage treatment device for food processing wastewater, comprising a stirrer (100), a sedimentation tank (200), and a sterilizer (300), wherein the sedimentation tank (200) is disposed between the stirrer (100) and the sterilizer (300), characterized in that, The feed end of the agitator (100) is fixedly connected to and connected to a quantitative dosing mechanism (400). The quantitative dosing mechanism (400) includes a water inlet pipe (410) fixedly connected to and connected to the feed end of the agitator (100). A guide box (420) is fixedly connected to and connected to the surface of the water inlet pipe (410). A storage tank (430) is fixedly connected to the surface of the guide box (420). A feed inlet (421) is provided on the surface of the guide box (420) and located inside the storage tank (430). A fan-shaped partition (440) is slidably connected inside the guide box (420). The notch of the fan-shaped partition (440) is intersected with the feed inlet (421). An outer fan impeller (450) is rotatably connected to the inner top wall and inner bottom wall of the guide box (420). The two outer fan impellers (450) are inserted into each other. The two outer fan impellers (450) are provided with mounting cavities (451) at their opposite ends. The quantitative dosing mechanism (400) also includes an adjustment component (460). The adjustment component (460) includes a threaded rod (461) threaded to the bottom of the storage tank (430). The top of the threaded rod (461) passes through the storage tank (430) and extends into the interior of the lower mounting cavity (451). The top of the threaded rod (461) is rotatably connected to a rotating shaft (462). The top of the rotating shaft (462) passes through the lower mounting cavity (451) and the fan-shaped partition (440) in sequence and extends into the interior of the upper mounting cavity (451). The surface of the rotating shaft (462) is fixedly connected with two inner fan impellers (463) that are respectively inserted into the two mounting cavities (451). The two inner fan impellers (463) are symmetrically distributed on both sides of the fan-shaped partition (440). The material guide box (420) has a vertical groove (423) inside, and a guide block (480) that is fixedly connected to the fan-shaped partition (440) is slidably connected inside the vertical groove (423).

2. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that, The inner top wall of the feed box (420) is provided with a circular cavity (422), and the upper outer fan impeller (450) extends into the interior of the circular cavity (422). The quantitative dosing mechanism (400) also includes a vibration component (470), which includes a spring piece (471) and a striking block (472). The spring piece (471) is fixedly connected to the interior of the circular cavity (422), and the striking block (472) is fixedly connected to the surface of the upper outer fan impeller (450). The shortest distance between the spring piece (471) and the axis of the upper outer fan impeller (450) is less than the maximum distance between the striking block (472) and the axis of the upper outer fan impeller (450).

3. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that, A bearing (464) is embedded in the top of the threaded rod (461), and the bearing (464) is embedded in the bottom of the rotating shaft (462).

4. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that, An adjusting rod (465) is fixedly connected to the bottom of the threaded rod (461), and the adjusting rod (465) is perpendicular to the threaded rod (461).

5. The multi-stage treatment device for food processing wastewater according to claim 2, characterized in that, The number of the spring pieces (471) is not less than ten, and the spring pieces (471) are fixedly connected in a ring around the axis of the outer fan impeller (450) above to the inside of the circular cavity (422).

6. The multi-stage treatment device for food processing wastewater according to claim 5, characterized in that, The horizontal cross-sectional shape of the spring piece (471) is U-shaped, and the opening of the cross-section of the spring piece (471) faces away from the axis of the outer fan impeller (450) above.

7. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that, A rubber sealing block (490) is embedded inside the vertical groove (423), and the rubber sealing block (490) wraps around the surface of the guide block (480).

8. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that, The two openings of the water inlet pipe (410) and the guide box (420) are both located on one side of the axis of the outer fan impeller (450) below, and the lowest point of the two openings of the water inlet pipe (410) and the guide box (420) is lower than the inner bottom wall of the guide box (420).

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