Biodiesel wastewater treatment device

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a biodiesel wastewater treatment device which comprises an air floatation tank and a pressure dissolved air tank connected to the air floatation tank, a drainage pipe is connected to the air floatation tank, a flow guide pipe is connected to the pressure dissolved air tank, a pressure pump is mounted at the tail end of the flow guide pipe, and an air inlet pipe is connected to the flow guide pipe. When saturated waste water is discharged into the air floatation tank, the servo motor is started to enable the conveying belt to drive the bucket to rotate reversely, the bucket rotates reversely to scrape scum on the water surface, part of the waste water can be scraped and discharged along with the scum, the ultrasonic liquid level sensor detects the water level in the air floatation tank, and once the water level drops, the water level in the air floatation tank is detected by the ultrasonic liquid level sensor. The ultrasonic liquid level sensor controls the electric screw rod to rotate reversely, so that the bucket moves downwards to be tightly attached to the water surface to continuously scrape the scum, and therefore, the scum can be scraped all the time along with the decline of the water level, the scum is fully scraped, and the scum scraping effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a biodiesel wastewater treatment device. Background Art

[0002] In the process of biodiesel wastewater treatment, the formation of scum is a common phenomenon. The scum is mainly composed of grease, protein, unreacted catalyst, and other insoluble impurities. They accumulate on the water surface to form a thick covering, which not only affects the treatment effect of the wastewater but may also damage the treatment equipment.

[0003] Chinese Patent with Publication No. CN215403218U discloses a treatment device for biodiesel wastewater, including a scum scraper. The scum scraper is arranged at the upper end of the flotation tank and is symmetrically provided with two groups of scum scraping tracks centered on the transmission rod. This device is equipped with a scum scraper, which is arranged at the upper end of the flotation tank, and the scum is scraped through the transmission rod and the scum scraping tracks. This design solves the problem of scum accumulation to a certain extent and improves the efficiency of wastewater treatment. Although the above patent can scrape the scum, during the scraping process, part of the wastewater will be scraped away together with the scum, resulting in a decrease in the water level of the wastewater. The decrease in the water level will cause the scum originally floating on the water surface to sink together, making it more difficult for the scum to contact the scum scraping rod, thus affecting the scum scraping effect.

[0004] The present invention aims to solve the problems existing in the above patent. Therefore, a biodiesel wastewater treatment device is proposed, which can continuously scrape the scum as the water level drops and improve the scum scraping effect. Summary of the Invention

[0005] In order to overcome the drawback that part of the wastewater will be scraped away together with the scum, resulting in a decrease in the water level of the wastewater. The decrease in the water level will cause the scum originally floating on the water surface to sink together, making it more difficult for the scum to contact the scum scraping rod, thus affecting the scum scraping effect. The present invention provides a biodiesel wastewater treatment device that can continuously scrape the scum as the water level drops and improve the scum scraping effect.

[0006] The present invention is achieved through the following technical solutions: A biodiesel wastewater treatment device comprises an air flotation tank and a pressure dissolved air tank connected to the air flotation tank, a drainage pipe is connected to the air flotation tank, a pressure dissolved air tank is connected to a guide pipe, a pressure pump is installed at the tail end of the guide pipe, an air intake pipe is connected to the guide pipe, and a lifting door is slidably connected to the air flotation tank, the lifting door is located on the left side of the collection frame, and a movable plate fixedly connected to the lifting door is symmetrically slidably connected to the inner side of the air flotation tank, and a scraping assembly is arranged between the movable plates for scraping off the scum on the water surface, one of the movable plates is fixedly connected to an internal threaded pipe, and the air flotation tank is fixedly connected to a pressure pump. A mounting frame is provided on which an electric screw threadedly connected to the internal threaded pipe is installed. An ultrasonic liquid level sensor is installed on the inner side of the flotation tank. The ultrasonic liquid level sensor is electrically connected to the electric screw through a control module. The ultrasonic liquid level sensor is used to detect the water level in the flotation tank. The ultrasonic liquid level sensor controls the rotation of the electric screw. The electric screw drives the scraper assembly to move through the internal threaded pipe and the movable plate, so that the scraper assembly moves with the change of water level to continuously scrape off the scum. A knocking assembly is provided between the lifting door and the movable plate for knocking and vibrating the scraper assembly.

[0007] According to a further description, a collecting frame is fixedly connected to the air flotation tank, and a discharge pipe is connected to the collecting frame.

[0008] Further explanation, the scraper assembly includes conveying rollers symmetrically rotatably connected between movable plates, a conveyor belt is wound between the conveying rollers, fixed plates are symmetrically fixed to the conveyor belt, a bucket is rotatably connected between the corresponding fixed plates, and is used to scoop up scum, a torsion spring is connected between the bucket and the fixed plates, a servo motor is installed on one of the movable plates, and the output shaft of the servo motor is connected to one of the conveying rollers through a synchronous belt assembly.

[0009] Further explanation, the knocking assembly includes a rotating shaft rotatably connected between the movable plates, the rotating shaft is located on the right side of the conveyor belt, and a fixed sleeve evenly spaced on the rotating shaft is provided with a convex ball ring for knocking and vibrating the bucket. A drive motor is installed on the inside of the lifting door, and the output shaft of the drive motor is connected to the rotating shaft through a synchronous belt assembly.

[0010] Further explanation, the biodiesel wastewater treatment device also includes a pushing assembly, which includes a pushing plate slidably connected to the bottom of the movable plate, used to push the scum on both sides of the conveyor belt to the middle, one side of the push plate is connected along the edge with an elastic cloth, both sides of the flotation tank are embedded with mounting plates, the mounting plate is fixedly connected to the elastic cloth, and a reciprocating screw threadedly connected to the push plate is rotatably penetrated on the movable plate, and the end of the reciprocating screw is fixedly connected to the end of one of the conveying rollers.

[0011] Further description: The biodiesel wastewater treatment device further includes an auxiliary component. The auxiliary component includes guide plates symmetrically fixed on the push plate. An impeller is rotatably connected between the guide plates and is used to push the scum to move. A disc is installed at the end of the impeller through a one-way clutch. Spherical balls are evenly spaced along the circumference on the disc. An L-shaped driving bar in contact with the spherical balls is fixed at the bottom of the movable plate and is used to drive the spherical balls to rotate.

[0012] Further description: The biodiesel wastewater treatment device further includes a blocking component. The blocking component includes an electric push rod installed on the mounting frame. A baffle is fixed at the end of the telescopic rod of the electric push rod and is used to block the water in the flotation tank.

[0013] Further description: The biodiesel wastewater treatment device further includes a rubber scraping plate fixedly sleeved on the rotating shaft. The rubber scraping plate and the convex ball ring are arranged in an alternating manner to scrape the scum attached to the inner side of the bucket.

[0014] The beneficial effects of the present invention are as follows: 1. Whenever saturated wastewater is discharged into the flotation tank, the servo motor is started to drive the conveyor belt to drive the bucket to reverse. The bucket reverses to scrape the scum on the water surface. Part of the wastewater will be scraped and discharged together with the scum. The ultrasonic level sensor detects the water level in the flotation tank. Once the water level drops, the ultrasonic level sensor controls the electric screw to reverse, so that the bucket moves downward to closely adhere to the water surface to continue scraping the scum. In this way, the scum can be continuously scraped as the water level drops, so as to fully scrape the scum and improve the slag scraping effect.

[0015] 2. Under the action of the push plate, whenever the bucket reverses, the push plate can push the scum on both sides of the conveyor belt to the lower part of the conveyor belt, and then the bucket scrapes the scum, which can prevent the scum on both sides of the conveyor belt from being difficult to be scraped by the bucket and affecting the slag scraping effect, thereby further improving the slag scraping effect.

[0016] 3. Under the action of the impeller, the scum on both sides of the conveyor belt can be further pushed to the lower part of the conveyor belt, so that the scum on both sides can better move to the lower part of the conveyor belt to be scraped by the bucket, thereby ensuring that the scum is more fully pushed to the middle to be scraped. Description of the Drawings

[0017] Figure 1 It is a three-dimensional structure diagram of the present invention.

[0018] Figure 2 It is a three-dimensional structure diagram of the collection box and the lifting door of the present invention.

[0019] Figure 3 It is a three-dimensional structure diagram of the movable plate and the ultrasonic level sensor of the present invention.

[0020] Figure 4 This is a three-dimensional structure schematic diagram of the conveyor belt and the bucket of the present invention.

[0021] Figure 5 For the present invention Figure 4 An enlarged schematic diagram of part A in it.

[0022] Figure 6 This is a three-dimensional structure schematic diagram of the knocking component of the present invention.

[0023] Figure 7 This is a three-dimensional structure schematic diagram of the material pushing component of the present invention.

[0024] Figure 8 This is a structural separation diagram of the mounting plate, the elastic cloth and the pushing plate of the present invention.

[0025] Figure 9 This is a three-dimensional structure schematic diagram of the auxiliary component of the present invention.

[0026] Figure 10 This is a three-dimensional structure schematic diagram of the impeller of the present invention.

[0027] Figure 11 This is a sectional structure schematic diagram of the air flotation tank and the movable plate of the present invention.

[0028] Figure 12 For the present invention Figure 10 An enlarged schematic diagram of part B in it.

[0029] Figure 13 This is a three-dimensional structure schematic diagram of the blocking component of the present invention.

[0030] Figure 14 This is a three-dimensional structure schematic diagram of the rubber scraper of the present invention.

[0031] The meanings of the reference numerals in the figure: 1 - air flotation tank, 2 - pressure dissolved air tank, 3 - diversion pipe, 4 - intake pipe, 5 - pressure pump, 6 - drain pipe, 7 - collection box, 8 - discharge pipe, 9 - lifting door, 10 - mounting rack, 11 - movable plate, 12 - internally threaded pipe, 13 - electric screw rod, 14 - ultrasonic liquid level sensor, 15 - conveying roller, 151 - conveyor belt, 152 - bucket, 153 - servo motor, 154 - fixing plate, 155 - torsion spring, 16 - rotating shaft, 161 - convex spherical ring, 162 - driving motor, 17 - mounting plate, 171 - elastic cloth, 172 - pushing plate, 173 - reciprocating lead screw, 18 - guiding plate, 181 - impeller, 182 - disc, 183 - spherical ball, 184 - L-shaped driving strip, 19 - electric push rod, 20 - baffle plate, 21 - rubber scraper. Detailed implementation manners

[0032] Example: A biodiesel wastewater treatment device, please refer to Figures 1-6As shown, it includes an air flotation tank 1 and a pressure dissolved air tank 2 connected to the lower left part of the air flotation tank 1. The upper right part of the air flotation tank 1 is open. The lower right part of the air flotation tank 1 is connected to a drain pipe 6. The top of the pressure dissolved air tank 2 is connected to a guide pipe 3. A pressure pump 5 is installed at the tail end of the guide pipe 3. An air inlet pipe 4 is connected to the left side of the guide pipe 3. A collection frame 7 is fixedly connected to the middle of the right side of the air flotation tank 1. The collection frame 7 can collect scum. The lower right part of the collection frame 7 is connected to a discharge pipe 8. The discharge pipe 8 can realize the discharge of scum, and also includes a lifting door 9, a mounting frame 10, a movable plate 11, an internal threaded pipe 12, an electric screw 13, an ultrasonic level sensor 14, a scraper assembly and a knocking assembly. The right side of the flotation tank 1 is vertically slidably connected with the lifting door 9, and the lifting door 9 is located on the left side of the collection frame 7. The inner side of the flotation tank 1 is vertically slidably connected with the movable plate 11 symmetrically front and back. The bottom right sides of the movable plates 11 on the front and rear sides are fixedly connected to the top of the lifting door 9, and the movable plates 11 on the front and rear sides are connected between A scraper assembly is provided. When the scraper assembly is in operation, the scraper assembly can scrape off the scum on the water surface. An internal threaded pipe 12 is fixedly connected to the left side of the top of the front movable plate 11. A mounting frame 10 is fixedly connected to the top of the flotation tank 1. An electric screw 13 is installed on the left front side of the mounting frame 10. The electric screw 13 is threadedly connected to the inner side of the internal threaded pipe 12. An ultrasonic liquid level sensor 14 is installed on the upper right side of the flotation tank 1. The ultrasonic liquid level sensor 14 is electrically connected to the electric screw 13 through a control module. The ultrasonic liquid level sensor 14 is used to detect the water level in the flotation tank 1. The ultrasonic liquid level sensor 14 controls the electric screw 13 to rotate. The electric screw 13 drives the movable plate 11 to move through the internal threaded pipe 12. The movable plate 11 drives the scraper assembly to move, so that the scraper assembly moves with the change of the water level to scrape off the scum. A knocking assembly is provided between the lifting door 9 and the movable plate 11. When the knocking assembly is in operation, the knocking assembly can knock and vibrate the scraper assembly.

[0033] See also Figures 3-5 As shown, the scraper assembly includes a conveying roller 15, a conveying belt 151, a bucket 152, a servo motor 153, a fixed plate 154 and a torsion spring 155. The conveying roller 15 is symmetrically connected to the front and rear movable plates 11, and the conveying belt 151 is wound around the conveying rollers 15 on the left and right sides. Two fixed plates 154 are symmetrically fixed to the outer side of the conveying belt 151. The bucket 152 is rotatably connected between the corresponding fixed plates 154 on the front and rear sides. When the bucket 152 reverses, the bucket 152 can shovel up the scum. A torsion spring 155 is connected between the bucket 152 and the fixed plate 154. A servo motor 153 is installed on the left side of the top of the rear movable plate 11, and the output shaft of the servo motor 153 is connected to the rear side of the left conveying roller 15 through a synchronous belt assembly.

[0034] See also Figure 3 and Figure 6As shown, the knocking assembly includes a rotating shaft 16, a convex ball ring 161 and a driving motor 162. The rotating shaft 16 is rotatably connected between the right sides of the front and rear movable plates 11. The rotating shaft 16 is located on the right side of the conveyor belt 151. Five convex ball rings 161 are evenly spaced and fixedly mounted on the rotating shaft 16. When the convex ball ring 161 rotates, the convex ball ring 161 can knock and vibrate the bucket 152 so that the scum can be better discharged from the bucket 152. A driving motor 162 is installed on the upper inner side of the lifting door 9, and the output shaft of the driving motor 162 is connected to the front side of the rotating shaft 16 through a synchronous belt assembly.

[0035] First, set the parameters on the booster pump 5 and the pressure dissolved gas tank 2, connect the booster pump 5 to the wastewater, then mix the chemical agent with the wastewater, and discharge the wastewater mixed with the chemical agent into the booster pump 5. The operation of the booster pump 5 increases the pressure of the wastewater, and the pressurized wastewater is then discharged into the pressure dissolved gas tank 2 through the guide pipe 3. At the same time, the outside air is discharged into the guide pipe 3 through the air inlet pipe 4, and the air in the guide pipe 3 is discharged into the pressure dissolved gas tank 2. The pressure dissolved gas tank 2 fully contacts and transfers the air and the wastewater, so that the air is dissolved in the wastewater and reaches the saturation level as much as possible, so as to avoid the slag from being integrated into the water again during the subsequent slag removal process, which can greatly reduce the workload of the on-site operators, improve the subsequent slag removal effect, and correspondingly improve the work efficiency. After the wastewater reaches the saturated state, the wastewater in the pressure dissolved gas tank 2 is discharged into the flotation tank 1. The flotation tank 1 removes the suspended matter and sediment in the raw water more thoroughly through chemical reactions, reduces the pressure of the later biochemical process, and achieves the effect of solid-liquid separation. When the scum separates from the water, the scum will float on the water surface. At this time, the ultrasonic liquid level sensor 14 is started. The ultrasonic liquid level sensor 14 detects the water level in the flotation tank 1 and starts the servo motor 153. The servo motor 153 drives the left conveying roller 15 to reverse through the synchronous belt assembly. The left conveying roller 15 reverses and drives the conveyor belt 151 to reverse through the right conveying roller 15. The conveyor belt 151 reverses and drives the bucket 152 to reverse through the fixed plate 154. The bucket 152 reverses and contacts the scum on the water surface. , bucket 152 reverses to push the scum to move to the right. When the scum moves to the right to the maximum stroke, bucket 152 continues to reverse to scoop up the scum, and then bucket 152 continues to reverse and contact with convex ball ring 161. Convex ball ring 161 makes bucket 152 swing in an inclined state, torsion spring 155 is compressed, and the scum in bucket 152 falls downward to collection frame 7 for collection. At this time, drive motor 162 is started, and drive motor 162 drives shaft 16 to reverse through synchronous belt assembly. The reverse rotation of shaft 16 drives convex ball ring 161 to reverse. The reverse rotation of convex ball ring 161 knocks and vibrates bucket 152. The vibration of bucket 152 vibrates the scum, which makes the scum fall into collection frame 7 faster. Then bucket 152 continues to reverse and contact with convex ball ring 1 When the scum 61 is out of contact, due to the action of the torsion spring 155, the bucket 152 swings in the opposite direction to reset. At this time, the other bucket 152 contacts the scum on the water surface and pushes it to scoop it up. This is repeated, and the scum on the water surface can be continuously scraped off for collection. At the same time, while the scum is being scraped off, part of the waste water will be scooped up by the bucket 152 and discharged into the collection frame 7 together with the scum for collection. As part of the waste water is shoveled out, the water level in the flotation tank 1 drops, and the ultrasonic liquid level sensor 14 controls the electric screw 13 to reverse through the control module. The electric screw 13 reverses and drives the internal threaded tube 12 to move downward. The internal threaded tube 12 moves downward and drives the front movable plate 11 to move downward. The front movable plate 11 moves downward and drives the conveying roller 15 to move downward through the rear movable plate 11.The conveying roller 15 moves downward to drive the conveyor belt 151 to move downward. The downward movement of the conveyor belt 151 drives the bucket 152 to move downward through the fixing plate 154. At the same time, the movable plate 11 also drives the lifting door 9 and the rotating shaft 16 to move downward. The rotating shaft 16 drives the convex ball ring 161 to move downward. The convex ball ring 161 moves downward synchronously with the bucket 152. When the bucket 152 moves downward and contacts the scum on the water surface, the electric screw 13 is closed, and the movable plate 11 stops driving the conveyor belt 151 to move downward through the conveying roller 15. The conveyor belt 151 stops driving the bucket 152 to move downward through the fixing plate 154, and the convex ball ring 161 also stops moving downward. Then the bucket 152 continues to scrape the scum on the water surface. In this way, the scum can be continuously scraped as the water level drops, so as to fully scrape the scum and improve the scum scraping effect. After all the scum on the water surface in the air flotation tank 1 is scraped off, start the drain pipe 6 to discharge the treated wastewater in the air flotation tank 1 for subsequent treatment. At the same time, start the discharge pipe 8 to discharge all the scum in the collection frame 7 for collection and treatment. Then start the electric screw 13 to rotate forward to drive the internal thread pipe 12 to move upward and reset. The internal thread pipe 12 drives the movable plate 11 to move upward and reset. The movable plate 11 drives the conveyor belt 151 to move upward and reset through the conveying roller 15, which also makes the bucket 152 and the lifting door 9 move upward and reset. At the same time, turn off the drive motor 162, and the rotating shaft 16 stops driving the convex ball ring 161 to reverse, and then the subsequent treatment of the treated wastewater can be started.,

[0036] Please refer to Figure 7 and Figure 8 As shown in the figure, the biodiesel wastewater treatment device further includes a pushing component installed between the movable plate 11 and the air flotation tank 1. The pushing component includes a mounting plate 17, an elastic cloth 171, a pushing plate 172 and a reciprocating lead screw 173. The pushing plates 172 are slidably connected to the bottoms of the front and rear sides of the movable plate 11. When the pushing plates 172 move inward, the pushing plates 172 can push the scum on both sides of the conveyor belt 151 towards the middle. Elastic cloths 171 are connected along the edges of the mutually remote sides of the front and rear pushing plates 172. Mounting plates 17 are fixedly embedded on the upper parts of the front and rear sides in the air flotation tank 1. The front and rear mounting plates 17 are respectively fixedly connected to the front and rear elastic cloths 171. Reciprocating lead screws 173 are rotatably penetrated through the right sides of the front and rear movable plates 11. The front and rear reciprocating lead screws 173 are respectively threadedly connected to the upper right sides of the front and rear pushing plates 172. The mutually close ends of the front and rear reciprocating lead screws 173 are respectively fixedly connected to the front and rear ends of the right conveying roller 15.

[0037] Please refer to Figures 9-12As shown in the figure, the biodiesel wastewater treatment device further includes an auxiliary component installed between the push plate 172 and the movable plate 11. The auxiliary component includes a guide plate 18, an impeller 181, a disc 182, a spherical ball 183, and an L-shaped driving bar 184. On the upper part of the mutually approaching sides of the front and rear push plates 172, guide plates 18 are symmetrically and fixedly connected to the left and right. An impeller 181 is rotatably connected between the left and right guide plates 18. When the impeller 181 rotates, the impeller 181 can push the floating scum to move. On the right ends of the front and rear impellers 181, discs 182 are installed through one-way clutches. On the right side surface of the disc 182, spherical balls 183 are fixedly connected at equal intervals along the circumference. On the right side of the bottom of the front and rear movable plates 11, L-shaped driving bars 184 are fixedly connected. The L-shaped driving bars 184 are in contact with the spherical balls 183. When the spherical balls 183 move, the L-shaped driving bars 184 can drive the spherical balls 183 to rotate.

[0038] When the conveying roller 15 drives the bucket 152 to reverse through the conveyor belt 151, the reverse rotation of the right conveying roller 15 also drives the reciprocating lead screw 173 to reverse. The reverse rotation of the reciprocating lead screw 173 drives the front and rear push plates 172 to move synchronously inwards and outwards. When the push plate 172 moves inwards, the push plate 172 pushes the floating scum on the water surfaces on the front and rear sides of the conveyor belt 151 inwards, so that the floating scum is located below the conveyor belt 151. The inward movement of the push plate 172 stretches the elastic cloth 171. The stretching of the elastic cloth 171 can prevent the floating scum from entering between the mounting plate 17 and the push plate 172, which makes it difficult to be scraped off. The floating scum moves inwards and is scraped off by the bucket 152. When the push plate 172 moves outwards and resets, the push plate 172 no longer stretches the elastic cloth 171, and the elastic cloth 171 contracts and resets. Repeating this process, the floating scum on the front and rear sides of the conveyor belt 151 can be continuously pushed below the conveyor belt 151 and scraped off by the bucket 152. After all the floating scum is scraped off, the conveying roller 15 stops driving the conveyor belt 151 to reverse, the right conveying roller 15 stops driving the reciprocating lead screw 173 to reverse, and the reciprocating lead screw 173 stops driving the front and rear push plates 172 to move. In this way, it can prevent the floating scum on the front and rear sides of the conveyor belt 151 from being difficult to be scraped off by the bucket 152, which affects the slag scraping effect, thereby further improving the slag scraping effect on the floating scum.

[0039] When the push plates 172 on the front and rear sides move inwards, the push plates 172 drive the impeller 181 to move inwards through the guide plate 18. The inward movement of the impeller 181 drives the disc 182 to move inwards, and the disc 182 drives the spherical ball 183 to move inwards. The L-shaped drive bar 184 contacts and presses against the spherical ball 183, causing the disc 182 to rotate. The disc 182 drives the impeller 181 to rotate, and the rotation of the impeller 181 drives the scum to rotate, causing the scum to move to directly below the conveyor belt 151 and be scraped off by the bucket 152. When the push plates 172 move outwards to reset, the push plates 172 drive the impeller 181 to move outwards and reset through the guide plate 18. The outward movement and reset of the impeller 181 drive the disc 182 to move outwards, and the disc 182 drives the spherical ball 183 to move outwards. Since the disc 182 and the impeller 181 are connected by a one-way clutch, the L-shaped drive bar 184 contacts and presses against the spherical ball 183 to drive the disc 182 to rotate idly, and the disc 182 will not drive the impeller 181 to rotate in the reverse direction. In this way, the scum on the front and rear sides can be better moved to below the conveyor belt 151 and scraped off by the bucket 152, ensuring that the scum is more fully pushed to the middle and scraped off.

[0040] Please refer to Figure 13 As shown, the biodiesel wastewater treatment device further includes a blocking component installed on the mounting frame 10. The blocking component includes an electric push rod 19 and a baffle 20. The electric push rod 19 is vertically installed on the upper right side of the mounting frame 10. The end of the telescopic rod of the electric push rod 19 is fixedly connected to the baffle 20. The baffle 20 contacts the open end of the air flotation tank 1. When the baffle 20 moves downwards, the baffle 20 can block the water in the air flotation tank 1.

[0041] Please refer to Figure 14 As shown, the biodiesel wastewater treatment device further includes a rubber scraper 21. Four rubber scrapers 21 are fixedly sleeved on the rotating shaft 16 at equal intervals. The rubber scrapers 21 are arranged alternately with the convex spherical ring 161. When the rubber scraper 21 rotates and contacts the bucket 152, the rubber scraper 21 can scrape off the scum attached to the inner side of the bucket 152.

[0042] When there is a large amount of scum attached in the collection frame 7, start the electric push rod 19. The telescopic rod of the electric push rod 19 extends to drive the baffle 20 to move downwards. The baffle 20 moves downwards and contacts the open end of the air flotation tank 1. The baffle 20 continues to move downwards and contacts the lifting door 9. Turn off the electric push rod 19. The baffle 20 blocks the open end of the air flotation tank 1, preventing the wastewater and scum in the air flotation tank 1 from overflowing. The operator can then clean the scum attached in the collection frame 7. When the scum attached in the collection frame 7 is cleaned up, start the electric push rod 19 to drive the baffle 20 to move upwards and reset. The baffle 20 resets and stops blocking the open end of the air flotation tank 1. In this way, it can prevent the wastewater and scum from overflowing and affecting the cleaning of the inside of the collection frame 7, facilitating the cleaning of the scum attached in the collection frame 7.

[0043] When the rotating shaft 16 rotates in the reverse direction to drive the convex spherical ring 161 to rotate in the reverse direction, the rotating shaft 16 also drives the rubber scraper 21 to rotate in the reverse direction. The rubber scraper 21 rotates in the reverse direction and contacts the bucket 152. The rubber scraper 21 scrapes off the floating slag on the inner side of the bucket 152, and the scraped floating slag falls into the collection box 7. When the rotating shaft 16 stops rotating in the reverse direction, the rotating shaft 16 stops driving the rubber scraper 21 to rotate in the reverse direction. In this way, it is possible to prevent the floating slag from adhering to the bucket 152 and causing subsequent contact with the wastewater again, resulting in residues, thereby ensuring that the floating slag fully falls and is collected.

Claims

1. A biodiesel wastewater treatment device, comprising an air flotation tank (1) and a pressure dissolved air tank (2) connected to the air flotation tank (1). A drain pipe (6) is connected to the air flotation tank (1), a diversion pipe (3) is connected to the pressure dissolved air tank (2), a pressure pump (5) is installed at the tail end of the diversion pipe (3), and an air inlet pipe (4) is connected to the diversion pipe (3). It is characterized in that, The invention also comprises a lifting door (9) slidably connected to the flotation tank (1), the lifting door (9) being located on the left side of the collecting frame (7), a movable plate (11) fixedly connected to the lifting door (9) being symmetrically slidably connected to the inner side of the flotation tank (1), a scraping assembly being arranged between the movable plates (11) for scraping off scum on the water surface, an internally threaded pipe (12) being fixedly connected to one of the movable plates (11), a mounting frame (10) being fixedly connected to the flotation tank (1), an electric screw (13) being threadedly connected to the internally threaded pipe (12) being installed on the mounting frame (10), and a super-screw (13) being installed on the inner side of the flotation tank (1) The ultrasonic liquid level sensor (14) is electrically connected to the electric screw (13) via a control module. The ultrasonic liquid level sensor (14) is used to detect the water level in the flotation tank (1). The ultrasonic liquid level sensor (14) controls the electric screw (13) to rotate. The electric screw (13) drives the scraper assembly to move via the internal threaded tube (12) and the movable plate (11), so that the scraper assembly moves with the change of the water level to continuously scrape away the scum. A knocking assembly is provided between the lifting door (9) and the movable plate (11) to knock and vibrate the scraper assembly.

2. The biodiesel wastewater treatment device according to claim 1, characterized in that, It also includes a collecting frame (7) fixedly connected to the air flotation tank (1), and a discharge pipe (8) is connected to the collecting frame (7).

3. The biodiesel wastewater treatment device according to claim 2, characterized in that, The scraper assembly comprises conveying rollers (15) symmetrically rotatably connected between the movable plates (11), a conveying belt (151) is wound between the conveying rollers (15), fixed plates (154) are symmetrically fixed to the conveying belt (151), buckets (152) are rotatably connected between the corresponding fixed plates (154) for shoveling up scum, and a torsion spring (155) is connected between the bucket (152) and the fixed plate (154), a servo motor (153) is installed on one of the movable plates (11), and the output shaft of the servo motor (153) is connected to one of the conveying rollers (15) through a synchronous belt assembly.

4. A biodiesel wastewater treatment device according to claim 3, characterized in that, The striking assembly comprises a rotating shaft (16) rotatably connected between the movable plates (11), the rotating shaft (16) being located on the right side of the conveyor belt (151), and a fixed sleeve evenly spaced on the rotating shaft (16) being provided with convex ball rings (161) for striking and vibrating the bucket (152), and a driving motor (162) being installed inside the lifting door (9), and an output shaft of the driving motor (162) being connected to the rotating shaft (16) through a synchronous belt assembly.

5. A biodiesel wastewater treatment device according to claim 4, characterized in that, The biodiesel wastewater treatment device also includes a pushing assembly, which includes a pushing plate (172) slidably connected to the bottom of the movable plate (11) and used to push the scum on both sides of the conveyor belt (151) toward the middle, one side of the pushing plate (172) is connected to an elastic cloth (171) along the edge, both sides of the flotation tank (1) are embedded with mounting plates (17) fixedly connected, the mounting plates (17) are fixedly connected to the elastic cloth (171), and a reciprocating screw (173) threadedly connected to the pushing plate (172) is rotatably penetrated on the movable plate (11), and the end of the reciprocating screw (173) is fixedly connected to the end of one of the conveying rollers (15).

6. The biodiesel wastewater treatment device according to claim 5, characterized in that, The biodiesel wastewater treatment device further includes an auxiliary component. The auxiliary component includes guide plates (18) symmetrically and fixedly connected to the push plate (172). An impeller (181) is rotatably connected between the guide plates (18) for pushing the scum to move. A disc (182) is installed at the end of the impeller (181) through a one-way clutch. Spheres (183) are fixedly connected to the disc (182) at circumferentially evenly spaced intervals. An L-shaped driving bar (184) in contact with the spheres (183) is fixedly connected to the bottom of the movable plate (11) for driving the spheres (183) to rotate.

7. A biodiesel wastewater treatment device according to claim 6, characterized in that, The biodiesel wastewater treatment device further includes a blocking component. The blocking component includes an electric push rod (19) installed on the mounting frame (10). A baffle (20) is fixedly connected to the end of the telescopic rod of the electric push rod (19) for blocking the water in the air flotation tank (1).

8. A biodiesel wastewater treatment device according to claim 7, characterized in that, The biodiesel wastewater treatment device further includes a rubber scraper (21) fixedly sleeved on the rotating shaft (16). The rubber scraper (21) is arranged in an alternating manner with the convex spherical ring (161) to scrape the scum attached to the inner side of the bucket (152).

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