A multi-treatment device for food processing wastewater

Abstract

This invention discloses a multi-stage treatment device for food processing wastewater, relating to the field of wastewater treatment technology. It includes a treatment chamber containing a coagulation tank, an aeration tank, a flotation tank, and a sludge tank arranged sequentially. This multi-stage treatment device treats wastewater from pastry filling production through an electrolytic demulsification tank, a coagulation tank, an aeration tank, and a flotation tank. A scraper mechanism uses scrapers to progressively compress scum along an inclined plate, while a power storage mechanism maintains the position of the moving scraper. When the scraper moves the scum to the sludge tank, the power storage mechanism causes the scraper to vibrate upon resetting due to delayed excitation and rebound. This vibration, combined with the squeezing and scraping action of a roller brush, removes residual scum. This multi-stage treatment device combines the characteristics of moving power storage and delayed resetting rebound when scraping scum from the flotation tank surface, preventing scum from returning to the flotation tank.

Description

Technical Field

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

[0002] Wastewater from pastry filling production contains large amounts of pollutants such as starch, sugar, edible oils, and protein residues. Combined with its high degree of emulsification, large fluctuations in water quality, and tendency to clog equipment, wastewater treatment equipment is generally required to treat the wastewater generated during the production of food fillings and other food ingredients through multiple stages, ensuring that the treated wastewater meets discharge standards.

[0003] According to the search, the Chinese patent with announcement number CN118420187B uses two cleaning components to clamp the scraper in the middle. The two cleaning components slide quickly to the right to clean the impurities remaining on the scraper, thus avoiding the scraper from sticking to impurities for a long time, causing the accumulated impurities to clump together and fall back into the air flotation machine housing.

[0004] In the above-mentioned scheme, flocculant is added to the wastewater flowing into the mixing zone. After mixing, the wastewater flows to the flotation zone, and dissolved air water is discharged into the flotation zone, causing impurities in the flotation zone to float on the water surface. Under the transmission of the chain, the scraper pushes the impurities on the upper side of the liquid surface along the inclined plate into the folded plate. When the scraper above the flotation zone moves to the folded plate and returns, the scum on the scraper surface is cleaned by the cleaning device. This cleaning position is above the flotation zone, which makes it very easy for the scum to fall back. This causes the scum of the wastewater treated by the entire treatment device to return to the flotation zone, thus affecting the treatment effect of food processing wastewater. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage treatment device for food processing wastewater to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage treatment device for food processing wastewater, comprising a treatment chamber, wherein a coagulation tank, an aeration tank, an air flotation tank and a sludge tank are arranged sequentially within the treatment chamber.

[0007] The wastewater in the coagulation tank is introduced into the electro-demulsification tank after being treated by the coagulation tank. An inclined plate is set at the edge of the sludge tank near the flotation tank. A sludge scraping mechanism is set on the flotation tank to guide suspended impurities into the sludge tank along the inclined plate.

[0008] The scraping mechanism that guides suspended impurities into the sludge tank along the inclined plate includes a drive roller and a chain. The two ends of the drive roller are mounted on the top of the flotation tank through bearing seats. The two ends of the drive roller are connected to the chain through sprockets. A limiting groove is connected between the two chains, and a scraper is connected to one side of the limiting groove.

[0009] The limiting groove is equipped with a power storage mechanism that elastically compresses the scraper. Inclined grooves are opened on both sides of the sludge tank near the inclined plate, and roller brushes are connected in the inclined grooves. The power storage mechanism can maintain the position of the scraper moving along the inclined plate. When the scraper scrapes the scum and moves it to the sludge tank, the power storage mechanism on the scraping mechanism can drive the scraper to hit the roller brush when it resets. The scraper scrapes the roller brush when it rebounds after a delay to remove the residue.

[0010] Preferably, a baffle is provided in the middle of the coagulation tank, an overflow port is provided on the upper side of the baffle, and a stirrer is provided in the coagulation tank located on both sides of the baffle.

[0011] The aeration tank is equipped with a release pipe inside, and a dissolved air tank is installed on the outer wall of the treatment chamber. The dissolved air tank releases high-pressure dissolved air water into the aeration tank through the release pipe, and the sewage overflowing from the aeration tank enters the flotation tank.

[0012] Preferably, a positioning pin is fixed on one side of the scraper, and a strip hole is vertically opened on the surface of the limiting groove. An anti-detachment ring is inserted into one end of the positioning pin that passes through the strip hole.

[0013] Preferably, magnetic sleeves slide at both ends of the limiting groove, and a notch is opened at one corner of the magnetic sleeve. The two ends of the limiting groove are connected to the chain through support rods, and the support rods limit the notch of the magnetic sleeves to prevent the magnetic sleeves from detaching from the limiting groove. A magnet with the opposite magnetism to the magnetic sleeves is embedded in the limiting groove, and a drive shaft is inserted into the inner cavity of the magnetic sleeves.

[0014] Preferably, the inner cavity of the magnetic sliding sleeve is provided with an adjustment groove, which is composed of a spiral groove and a straight groove connected together, and a ball is embedded on the side of the magnetic sliding sleeve away from the inner cavity.

[0015] One end of the drive shaft is fixed with a protrusion that slides along the adjustment groove, and guide strips are installed on both sides of the inner wall of the flotation tank.

[0016] Preferably, the guide bar has an arc-shaped guide portion at one end near one of the drive rollers, the other end of the guide bar is located below between the two drive rollers, and the end of the guide bar away from the arc-shaped guide portion is parallel to the upper edge of the flotation tank.

[0017] Preferably, the power storage mechanism includes a slider that slides along a track within a limiting groove, a toothed seat that slides laterally on the slider, a rotating block that is rotatably connected to one side of the toothed seat, and a guide seat that connects the two rotating blocks.

[0018] Preferably, a limiting bolt is connected to the limiting groove, and one end of the limiting bolt passes through the guide seat. A compression spring that is sleeved with the limiting bolt is connected inside the guide seat. A T-shaped pin is provided on one side of the guide seat. The T-shaped pin passes through the reserved opening on the surface of the limiting groove and is inserted into the scraper.

[0019] Preferably, the slider is provided with a toothed sleeve that meshes with the bottom wall of the toothed seat, and one end of the drive shaft is interference-fitted with the toothed sleeve;

[0020] A stop bar is laterally connected to the top of the toothed seat, and a tension spring is connected between the stop bar and the rotating block;

[0021] The outer wall of the rotating block is provided with locking teeth, and the inner wall of the limiting groove is fixed with a rack that meshes with the locking teeth.

[0022] Preferably, the end of the arc-shaped guide portion of the guide bar corresponds to the bottom end of the inclined groove.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: This multi-stage wastewater treatment device for food processing sequentially treats the wastewater from the production of pastry fillings through an electrolytic demulsification tank, a coagulation tank, an aeration tank, and an air flotation tank. The scraper mechanism uses a scraper to gradually compress scum along an inclined plate, while a power storage mechanism maintains the position of the moving scraper. When the scraper moves the scum to the sludge tank, the power storage mechanism drives the scraper to vibrate upon resetting due to delayed excitation and rebound. This vibration, combined with the squeezing and scraping action of the roller brush, removes residual scum. This ensures that the scraper mechanism combines the characteristics of moving power storage and delayed resetting rebound when scraping scum from the surface of the air flotation tank, preventing scum from returning to the air flotation tank. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the processing chamber of the present invention;

[0025] Figure 2 This is a three-dimensional cross-sectional structural diagram of the processing chamber of the present invention;

[0026] Figure 3 For the present invention Figure 1 A magnified view of the structure at point A in the middle;

[0027] Figure 4 This is a three-dimensional structural diagram of the linkage between the sludge tank, the scraping mechanism, and the power storage mechanism of the present invention;

[0028] Figure 5 This is a three-dimensional cross-sectional view of the magnetic suction sleeve and the drive shaft of the present invention.

[0029] Figure 6 This is a three-dimensional cross-sectional view of the scraper and energy storage mechanism of the present invention;

[0030] Figure 7 This is a schematic diagram of the first side cross-section of the energy storage mechanism of the present invention;

[0031] Figure 8 This is a schematic diagram of the second side cross-section of the energy storage mechanism of the present invention;

[0032] Figure 9 This is a schematic diagram of the third side cross-section of the energy storage mechanism of the present invention;

[0033] Figure 10 This is a side view sectional diagram of the slider and toothed seat of the present invention.

[0034] In the diagram: 1. Coagulation tank; 101. Overflow outlet; 102. Agitator; 2. Electro-demulsification tank; 3. Aeration tank; 301. Release pipe; 302. Dissolved air tank; 4. Air flotation tank; 401. Guide bar; 5. Sludge tank; 501. Inclined plate; 502. Roller brush; 503. Inclined trough; 6. Sludge scraping mechanism; 601. Drive roller; 602. Chain; 603. Limiting groove; 603a. Magnetic suction sleeve; 603a1. Adjustment groove; 603a2, ball bearing; 603b, magnet; 603c, drive shaft; 603c1, protrusion; 604, scraper; 604a, positioning pin; 7, power storage mechanism; 701, slider; 701a, gear sleeve; 702, gear seat; 702a, stop bar; 702b, tension spring; 703, guide seat; 704, rotating block; 705, rack; 706, limit bolt; 707, compression spring. Detailed Implementation

[0035] 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, and 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.

[0036] Please see Figure 1 and Figure 2 The present invention provides a technical solution: a multi-stage treatment device for food processing wastewater, including a treatment chamber, in which a coagulation tank 1, an aeration tank 3, an air flotation tank 4 and a sludge tank 5 are arranged in sequence. The wastewater in the coagulation tank 1 is introduced after being treated by an electro-demulsification tank 2.

[0037] A baffle is provided in the middle of the coagulation tank 1, and an overflow port 101 is provided on the upper side of the baffle. A stirrer 102 is provided in the coagulation tank 1 located on both sides of the baffle. A release pipe 301 is provided inside the aeration tank 3. A dissolved air tank 302 is installed on the outer wall of the treatment chamber. The dissolved air tank 302 releases high-pressure dissolved air water in the aeration tank 3 through the release pipe 301. The sewage overflowing from the aeration tank 3 enters the flotation tank 4.

[0038] An inclined plate 501 is provided at the edge of the sludge tank 5 near the flotation tank 4, and a scraping mechanism 6 is provided on the flotation tank 4 to guide suspended impurities into the sludge tank 5 along the inclined plate 501.

[0039] In this embodiment, the wastewater generated from the production of pastry fillings is introduced into the electro-demulsification tank 2. Through electro-demulsification and flocculation, flocculation stratification is generated. The flocculation stratification of the emulsion produces flocculated scum, flocculated clear liquid, and flocculated sediment. The flocculated scum and flocculated sediment are discharged separately, and the flocculated clear liquid is introduced into the coagulation tank 1. The two chambers separated by the baffle are stirred by the agitator 102. When the liquid level in the first chamber rises to the overflow port 101, it will enter the second chamber along the overflow port 101. By adding coagulants, coagulant aids, etc. to the coagulation tank 1, and then using the stirring of the two agitators 102, the flocculated clear liquid and chemical agents can react fully, so that the suspended solids and other pollutants in the raw water will coagulate and flocculate to form larger flocs.

[0040] High-pressure dissolved air water is introduced into the release pipe 301 through the dissolved air tank 302, which can mix with the sewage entering the aeration tank 3 in the coagulation tank 1. During the mixing process of the high-pressure dissolved air water, the gas in the water is rapidly released to form a large number of microbubbles. At this time, the microbubbles attach to the flocculated suspended solids and enter the flotation tank 4 together. Then, aeration is carried out through the aeration pipe at the bottom of the flotation tank 4. The buoyancy of the bubbles is used to carry the suspended solids, oil and other pollutants in the raw water to the surface to form scum, thus achieving solid-liquid separation. Finally, the scum on the water surface is guided into the sludge tank 5 along the inclined plate 501 by the scum scraping mechanism 6.

[0041] Please see Figures 2-4 and Figure 6 The scraping mechanism 6, which guides suspended impurities into the sludge tank 5 along the inclined plate 501, includes a drive roller 601 and a chain 602. The two ends of the drive roller 601 are mounted on the top of the flotation tank 4 through bearing seats. The two ends of the drive roller 601 are connected to the chain 602 through sprockets. The end of one of the drive rollers 601 is controlled to rotate by a drive motor. A limiting groove 603 is connected between the two chains 602. A scraper 604 is connected to one side of the limiting groove 603.

[0042] A positioning pin 604a is fixed on one side of the scraper 604, and a strip hole is vertically opened on the surface of the limiting groove 603. An anti-detachment ring is inserted into one end of the positioning pin 604a that passes through the strip hole.

[0043] In this embodiment, the positioning pin 604a of the scraper 604 passes through the strip hole on the surface of the limiting groove 603, and the anti-detachment ring passes through the positioning pin 604a, so that the scraper 604 and the limiting groove 603 are positioned and fitted together. When the two ends of the drive roller 601 drive the chain 602 to rotate through the sprocket, the chain 602 can drive the limiting groove 603 and the scraper 604 to rotate in a ring, so that the scraper 604 can scrape the scum on the water surface toward the inclined plate 501.

[0044] Please see Figures 3-6The two ends of the limiting groove 603 are slidably fitted with magnetic sleeves 603a. One corner of the magnetic sleeve 603a has a notch. The two ends of the limiting groove 603 are connected to the chain 602 by a support rod. The support rod limits the notch of the magnetic sleeve 603a to prevent the magnetic sleeve 603a from falling out of the limiting groove 603. A magnet 603b with the opposite magnetism to the magnetic sleeve 603a is embedded in the limiting groove 603. A drive shaft 603c is inserted into the inner cavity of the magnetic sleeve 603a.

[0045] An adjustment groove 603a1 is provided in the inner cavity of the magnetic sliding sleeve 603a. The adjustment groove 603a1 is composed of a spiral groove and a straight groove connected together. A ball bearing 603a2 is embedded on the side of the magnetic sliding sleeve 603a away from the inner cavity. A protrusion 603c1 that slides along the adjustment groove 603a1 is fixed at one end of the drive shaft 603c. Guide strips 401 are installed on both sides of the inner wall of the air flotation tank 4.

[0046] The guide bar 401 has an arc-shaped guide portion at one end near one of the drive rollers 601, and the other end of the guide bar 401 is located below the two drive rollers 601. The end of the guide bar 401 away from the arc-shaped guide portion is parallel to the upper edge of the flotation tank 4.

[0047] In this embodiment, when the chain 602 drives the scraper 604 from leaving the water surface to scraping and adjusting the scum, the limiting groove 603 will drive the magnetic sleeves 603a at both ends to gradually approach the guide bar 401. When the balls 603a2 of the magnetic sleeve 603a squeeze the guide bar 401 and roll laterally, the squeezed magnetic sleeve 603a will move closer to the magnet 603b.

[0048] When the magnetic sleeve 603a moves toward the magnet 603b, the magnetic sleeve 603a will press the protrusion 603c1 at one end of the drive shaft 603c through the spiral groove in the adjusting groove 603a1, causing the protrusion 603c1 to drive the drive shaft 603c to rotate in the forward direction. Conversely, when the ball 603a2 on the magnetic sleeve 603a separates from the guide bar 401, the repulsive force between the magnet 603b and the magnetic sleeve 603a will drive the magnetic sleeve 603a to reset in the reverse direction. At this time, the magnetic sleeve 603a will press the protrusion 603c1 at one end of the drive shaft 603c in the reverse direction through the spiral groove, causing the drive shaft 603c to rotate in the reverse direction and reset.

[0049] Please see Figure 3 , Figure 4 and Figures 6-10 The limiting groove 603 is provided with a power storage mechanism 7 for elastically squeezing the scraper 604. The power storage mechanism 7 includes a slider 701 that slides along the track in the limiting groove 603. A toothed seat 702 slides laterally on the slider 701. A rotating block 704 is rotatably connected to one side of the toothed seat 702. A guide seat 703 is connected between the two rotating blocks 704.

[0050] A limiting bolt 706 is connected to the limiting groove 603, and one end of the limiting bolt 706 passes through the guide seat 703. A compression spring 707 that is sleeved with the limiting bolt 706 is connected inside the guide seat 703. A T-shaped pin is provided on one side of the guide seat 703. The T-shaped pin passes through the reserved opening on the surface of the limiting groove 603 and is inserted into the scraper 604.

[0051] In this embodiment, when the chain 602 drives the scraper 604 to scrape the scum and move it above the inclined plate 501, the continuing to move chain 602 will continue to drive the scraper 604 to squeeze against the inclined plate 501. At this time, the scraper 604 will drive the positioning pin 604a to slide directionally along the strip hole of the limiting groove 603. At the same time, the scraper 604 will drive the guide seat 703 to slide along the reserved opening through the T-pin. Thus, the guide seat 703 will compress the spring 707 along the limiting bolt 706, so that the squeezed scraper 604 has the function of moving and storing force, which facilitates the scraper 604 to move quickly when it is reset later.

[0052] Please see Figures 6-9 The slider 701 has a toothed sleeve 701a that meshes with the bottom wall of the toothed seat 702. One end of the drive shaft 603c is interference-fitted with the toothed sleeve 701a. A stop bar 702a is laterally connected to the top of the toothed seat 702. A tension spring 702b is connected between the stop bar 702a and the rotating block 704. The outer side wall of the rotating block 704 is provided with a locking tooth. A rack 705 that meshes with the locking tooth is fixed to the inner wall of the limiting groove 603.

[0053] In this embodiment, when the guide bar 401 pushes the ball 603a2 to drive the magnetic sleeve 603a to come close to the magnet 603b, the magnetic sleeve 603a will drive the drive shaft 603c to rotate through the adjustment groove 603a1. At this time, the magnetic sleeve 603a that moves in conjunction with the guide bar 401 will drive the drive shaft 603c to drive the toothed sleeve 701a to mesh with the toothed seat 702 in the forward direction, so that the toothed seat 702 and the slider 701 can abut against each other.

[0054] As the scraper 604 moves from just contacting the inclined plate 501 to abutting the upper edge of the inclined plate 501, the scraper 604 on one side of the limiting groove 603 will drive the sliders 701, toothed seats 702 and rotating blocks 704 on both sides to move upward through the guide seat 703. When the rotating block 704 moves upward, it will squeeze the rack 705 through the locking teeth on the outer wall to generate rotation. At this time, the downward deflected rotating block 704 will pull the tension spring 702b on the stop rod 702a. When the upward rotating block 704 causes the locking teeth and rack 705 to stop squeezing each other, the reset action of the tension spring 702b can make the locking teeth of the rotating block 704 re-engage with the rack 705. Therefore, the power storage mechanism 7 can have the function of preventing loosening.

[0055] When the scraper 604 moves to the upper edge of the inclined plate 501, the slider 701, the tooth seat 702 and the rotating block 704 move to the limit position. At this time, the scraper 604 can maintain its position after being squeezed by the locking action of the tooth of the rotating block 704. At this time, the compression spring 707 will be compressed to the limit state.

[0056] Please see Figures 1-4 The sludge tank 5 has inclined grooves 503 on both sides near the inclined plate 501. The roller brush 502 is connected in the inclined groove 503. The end of the arc-shaped guide part of the guide strip 401 corresponds to the bottom end of the inclined groove 503.

[0057] In this embodiment, when the scraper 604 rotates from the upper edge of the inclined plate 501 to disengage, the ball 603a2 on one side of the magnetic sleeve 603a will continue to roll and abut against the guide bar 401 until the magnetic sleeves 603a at both ends of the limiting groove 603 disengage from the end of the guide part. The magnetic sleeves 603a repelled by the magnet 603b will move in the opposite direction and drive the drive shaft 603c to rotate in the opposite direction through the adjusting groove 603a1. As a result, the drive shaft 603c will drive the tooth seat 702 away from the slider 701 through the tooth sleeve 701a. This causes the tooth seat 702 to drive the locking teeth on the outer wall of the rotating block 704 to move laterally away from the rack 705. At the same time as the locking teeth and the rack 705 move laterally away, the compressed compression spring 707 will push the guide seat 703 back, so that the scraper 604 can achieve a rapid reset elastic vibration effect along the surface of the limiting groove 603. This can help shake off residual scum from the scraper 604 that is storing and squeezing.

[0058] When the magnetic sleeve 603a disengages from the end of the arc-shaped guide section, the chain 602, driven by the sprocket, rotates and drives the scraper 604 to rotate upward. At this time, the scraper 604, driven by the energy storage mechanism 7 to reset and rebound, will directly impact the roller brush 502. When the scraper 604 squeezes the roller brush 502, the roller brush 502 will roll and wipe away the residual scum attached to the scraper 604. The roller brush 502 will also move along the inclined groove 503 to avoid the scraper. At this time, the contact position between the roller brush 502 and the scraper 604 will move from the middle to the outer edge until the two separate. Therefore, the roller brush 502 will assist in removing the residual scum on the surface of the scraper 604, ensuring that the scraped scum can be sent to the sludge tank 5 and will not return to the flotation tank 4.

[0059] It should be noted that when the gear seat 702 moves away from the slider 701, the T-pin on one side of the guide seat 703 will move laterally along the reserved opening of the limiting groove 603 and the scraper 604. Since the opening at the bottom of the guide seat 703 is wider than the diameter of the limiting bolt 706, there will be no interference or obstruction when the guide seat 703 moves laterally (see reference). Figure 9 ).

[0060] In summary, as the scraper 604 gradually presses along the inclined plate 501, the energy storage mechanism 7 can maintain the position of the scraper 604 moving along the inclined plate 501. When the scraper 604 scrapes the scum and moves it to the sludge tank 5, the energy storage mechanism 7 on the scraper mechanism 6 can drive the scraper 604 to strike the roller brush 502 when it resets. The scraper 604 scrapes against the roller brush 502 during the delayed rebound to remove the residue. This ensures that the scraper mechanism 6 has the characteristics of both moving energy storage and delayed reset rebound when scraping the scum on the surface of the flotation tank 4. It also ensures that the delayed rebound scraper 604 and the roller brush 502 can remove the attached residual scum. The contents not described in detail in this description are prior art known to those skilled in the art.

Claims

1. A multi-stage treatment device for food processing wastewater, comprising a treatment chamber, wherein a coagulation tank (1), an aeration tank (3), an air flotation tank (4), and a sludge tank (5) are sequentially arranged within the treatment chamber, characterized in that: The wastewater in the coagulation tank (1) is introduced into the electro-demulsification tank (2) after treatment. An inclined plate (501) is provided at the edge of the sludge tank (5) near the flotation tank (4). A scraping mechanism (6) is provided on the flotation tank (4) to guide suspended impurities into the sludge tank (5) along the inclined plate (501). The scraping mechanism (6) that guides suspended impurities into the sludge tank (5) along the inclined plate (501) includes a drive roller (601) and a chain (602). The two ends of the drive roller (601) are mounted on the top of the flotation tank (4) through bearing seats. The two ends of the drive roller (601) are connected to the chain (602) through sprockets. A limiting groove (603) is connected between the two chains (602). A scraper (604) is connected to one side of the limiting groove (603). The limiting groove (603) is provided with a power storage mechanism (7) for elastically squeezing the scraper (604). The sludge tank (5) has inclined grooves (503) on both sides near the inclined plate (501). The roller brush (502) is connected in the inclined groove (503). The power storage mechanism (7) can keep the scraper (604) moving along the inclined plate (501) in position. When the scraper (604) scrapes the scum and moves it to the sludge tank (5), the power storage mechanism (7) on the scraping mechanism (6) can drive the scraper (604) to hit the roller brush (502) when it resets. The scraper (604) scrapes the roller brush (502) when it rebounds after a delay to remove the residue.

2. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that: A baffle is provided in the middle of the coagulation tank (1), and an overflow port (101) is provided on the upper side of the baffle. A stirrer (102) is provided in the coagulation tank (1) located on both sides of the baffle. The aeration tank (3) is equipped with a release pipe (301) inside and a dissolved air tank (302) is installed on the outer wall of the treatment chamber. The dissolved air tank (302) releases high-pressure dissolved air water in the aeration tank (3) through the release pipe (301), and the sewage overflowing from the aeration tank (3) enters the flotation tank (4).

3. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that: A positioning pin (604a) is fixed on one side of the scraper (604), and a strip hole is vertically opened on the surface of the limiting groove (603). An anti-detachment ring is inserted into one end of the positioning pin (604a) that passes through the strip hole.

4. The multi-stage treatment device for food processing wastewater according to claim 1, characterized in that: A magnetic sleeve (603a) slides at both ends of the limiting groove (603). A notch is opened at one corner of the magnetic sleeve (603a). The two ends of the limiting groove (603) are connected to the chain (602) through a support rod. The support rod limits the notch of the magnetic sleeve (603a) to prevent the magnetic sleeve (603a) from falling out of the limiting groove (603). A magnet (603b) with the opposite magnetism to the magnetic sleeve (603a) is embedded in the limiting groove (603). A drive shaft (603c) is inserted into the inner cavity of the magnetic sleeve (603a).

5. A multi-stage treatment device for food processing wastewater according to claim 4, characterized in that: An adjustment groove (603a1) is provided in the inner cavity of the magnetic sliding sleeve (603a). The adjustment groove (603a1) is composed of a spiral groove and a straight groove connected together. A ball (603a2) is embedded on the side of the magnetic sliding sleeve (603a) away from the inner cavity. One end of the drive shaft (603c) is fixed with a protrusion (603c1) that slides along the adjustment groove (603a1), and guide strips (401) are installed on both sides of the inner wall of the flotation tank (4).

6. A multi-stage treatment device for food processing wastewater according to claim 5, characterized in that: The guide bar (401) has an arc-shaped guide at one end near one of the drive rollers (601), and the other end of the guide bar (401) is located below the two drive rollers (601). The end of the guide bar (401) away from the arc-shaped guide is parallel to the upper edge of the flotation tank (4).

7. A multi-stage treatment device for food processing wastewater according to claim 4, characterized in that: The power storage mechanism (7) includes a slider (701) that slides along the track inside the limiting groove (603). A toothed seat (702) slides laterally on the slider (701). A rotating block (704) is rotatably connected to one side of the toothed seat (702). A guide seat (703) is connected between the two rotating blocks (704).

8. A multi-stage treatment device for food processing wastewater according to claim 7, characterized in that: The limiting groove (603) is connected to a limiting bolt (706), and one end of the limiting bolt (706) passes through the guide seat (703). The guide seat (703) is fitted with a compression spring (707) that is sleeved with the limiting bolt (706). A T-shaped pin is provided on one side of the guide seat (703). The T-shaped pin passes through the reserved opening on the surface of the limiting groove (603) and is inserted into the scraper (604).

9. A multi-stage treatment device for food processing wastewater according to claim 8, characterized in that: The slider (701) is provided with a toothed sleeve (701a) that meshes with the bottom wall of the toothed seat (702), and one end of the drive shaft (603c) is interference-fitted with the toothed sleeve (701a). A stop bar (702a) is laterally connected to the top of the toothed seat (702), and a tension spring (702b) is connected between the stop bar (702a) and the rotating block (704). The outer wall of the rotating block (704) is provided with a locking tooth, and the inner wall of the limiting groove (603) is fixed with a rack (705) that meshes with the locking tooth.

10. A multi-stage treatment device for food processing wastewater according to claim 5, characterized in that: The end of the arc-shaped guide portion of the guide bar (401) corresponds to the bottom end of the inclined groove (503).

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