Kitchen grease tank returned wastewater and waste residue treatment system

Abstract

The utility model relates to the technical field of wastewater and waste residue treatment, and discloses a kitchen grease tank returned wastewater and waste residue treatment system which comprises a cooking kettle, a three-phase separator, a wastewater tank, a first grease tank, an oil conveying pipe, a draining tank, a wall scraping device and a blow-off pipe, a fourth discharge pipe of the first grease tank is communicated with the inlet end of the cooking kettle through a first return pipe; the oil delivery pipe is communicated with the fourth discharge pipe; a second feeding pipe of the draining tank is communicated with a fourth discharging pipe, and a second return pipe of the draining tank is communicated with the inlet end of the cooking kettle; a wall scraping paddle of the wall scraping device extends into the first grease tank; and the blow-off pipe is communicated with the fourth discharge pipe. According to the kitchen grease tank returned wastewater and waste residue treatment system, the conveying direction can be flexibly selected according to the oil content of returned wastewater and waste residues, materials in the draining tank are prevented from being polluted, the wall scraping device is arranged in the grease tank to regularly clean emulsion impurities, and the maintenance cost is low.

Description

Technical Field

[0001] This utility model relates to the field of wastewater and waste residue treatment technology, and in particular to a wastewater and waste residue treatment system for kitchen grease tanks. Background Technology

[0002] In the field of food waste treatment, a multi-step combined treatment process is typically employed to achieve waste reduction and resource utilization. After initial treatment, the slurry obtained by separating the food waste through a screw press is fed into a cooking kettle for heating and cooking to break down the colloidal structure of the material and kill microorganisms. The cooked material is then transported to a three-phase separator, where it is separated to obtain three products: solid waste residue, wastewater, and grease. The solid waste residue is usually temporarily stored in a waste bin for further disposal; the wastewater is temporarily stored in a wastewater tank and then sent to a sewage treatment system for purification; and the separated grease is collected and stored in an grease tank. After settling and stratification, the qualified upper layer of grease can be sold to professional biodiesel production companies for resource utilization.

[0003] In the prior art, in order to deal with the unqualified oil (mainly the oil with more impurities in the lower layer) generated after standing in the oil tank, a wastewater and waste residue return pipe is usually installed at the bottom of the oil tank. This wastewater and waste residue return pipe is connected to the drain tank and is used to transport the unqualified oil to the drain tank for draining treatment. The drained material is then returned to the cooking kettle for secondary processing.

[0004] However, when substandard grease has an excessively high oil content, it can easily contaminate other materials already isolated in the dewatering tank after being transported there, leading to a high grease loss rate and reduced resource recovery efficiency. Furthermore, during storage in the grease tank, emulsions easily adhere to the bottom, forming impurities. These substances have poor flowability and are difficult to completely remove through conventional discharge methods. Long-term accumulation leads to spoilage and decay, affecting not only the overall quality of the grease in the tank but also requiring regular cleaning by professional organizations, increasing equipment maintenance costs.

[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a wastewater and waste residue treatment system for kitchen grease tanks, which aims to solve the technical problems of high grease loss during wastewater and waste residue treatment of grease tanks and the easy deterioration and difficulty in cleaning caused by the deposition of emulsion impurities at the bottom of the tank.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A system for treating wastewater and waste residue from kitchen grease tanks includes:

[0009] A cooking kettle is used to heat and cook the slurry of kitchen waste after steaming and pressing.

[0010] A three-phase separator is used to separate solid sludge, wastewater and grease from the slurry of heated and cooked kitchen waste; the three-phase separator includes a first feed pipe, a second discharge pipe for discharging wastewater and a third discharge pipe for discharging grease; the first feed pipe is connected to the outlet end of the cooking kettle;

[0011] The wastewater tank is connected to the second discharge pipe of the three-phase separator;

[0012] The first grease tank is used to store the grease separated by the three-phase separator. The top of the first grease tank is connected to the third discharge pipe of the three-phase separator, and the bottom of the first grease tank is provided with a fourth discharge pipe. The fourth discharge pipe is connected to the inlet end of the cooking kettle through the first reflux pipe.

[0013] The oil pipeline is used to discharge refined oil, and it is connected to the fourth discharge pipeline.

[0014] The drain tank is used to drain wastewater and waste residue. The top of the drain tank is equipped with a second discharge pipe that is connected to the fourth discharge pipe, and the bottom of the drain tank is equipped with a second return pipe that is connected to the inlet end of the cooking kettle.

[0015] A wall-scraping device is vertically mounted on a first grease tank. The output end of the device has a rotatable wall-scraping blade that extends into the first grease tank and acts on its inner wall and bottom.

[0016] The drain pipe is connected to the fourth drain pipe of the first grease tank and is used to discharge emulsion impurities scraped from the first grease tank.

[0017] Furthermore, it also includes a second oil tank for storing finished oil products, with an oil drain pipe at the bottom and the top of the second oil tank connected to the oil delivery pipe.

[0018] Furthermore, it also includes a temporary storage tank, the bottom of which is provided with a third return pipe. The third return pipe is connected to the second return pipe of the drain tank through the first infusion pipe, and the third return pipe is connected to the inlet end of the cooking kettle.

[0019] Furthermore, a fifth discharge pipe is provided at the bottom of the wastewater tank, and the fifth discharge pipe is connected to the first return pipe through the third infusion pipe.

[0020] Furthermore, the first oil tank is provided with a lid on top, and the wall scraping device further includes a lifting mechanism, a rotating mechanism, and a bushing. The bushing is rotatably connected to the lid, and the wall scraping paddle is provided with a drive shaft. The drive shaft is provided with a spline portion, and the bushing is provided with a keyway that is slidably connected to the spline portion. The rotating mechanism is located on the top of the lid and is used to drive the bushing to rotate so as to drive the drive shaft to rotate. The output end of the lifting mechanism is provided with a movable plate that can slide up and down, and the top of the drive shaft is rotatably connected to the movable plate.

[0021] Furthermore, the movable plate is provided with an auxiliary frame, which includes several guide rods located at the bottom of the movable plate and an auxiliary plate fixedly connected to all the guide rods. The multiple guide rods pass through the can lid and are vertically slidably connected to the can lid. The auxiliary plate is located below the can lid, and the drive shaft is rotatably connected to the auxiliary plate.

[0022] Furthermore, the rotating mechanism includes a drive motor mounted on the can lid and a driven wheel fixed on the bushing. The output end of the drive motor is provided with a driving wheel, and a synchronous belt is fitted on the driving wheel and the driven wheel.

[0023] Furthermore, the bottom of the first grease tank is provided with a funnel-shaped flow guide. The wall scraper includes a spindle, at least two first scrapers arranged in a circumferential array on the spindle, and at least two second scrapers arranged in a circumferential array on the spindle. The first scrapers act on the inner wall of the first grease tank, and the second scrapers act on the inner wall of the flow guide. The multiple first scrapers and multiple second scrapers are staggered.

[0024] Furthermore, it also includes a heating device and an insulation layer. The heating device includes a heat-conducting oil pipe wound around the outer wall of the first grease tank, and a heat-conducting oil heating device is connected to the outside of the heat-conducting oil pipe. The insulation layer is installed on the outer wall of the first grease tank and covers the heating device.

[0025] Furthermore, the drain tank includes a tank body and a drain rack disposed within the tank body. At least two filter frames are arranged at intervals along the vertical direction on the drain rack, and the mesh count of the multiple filter frames gradually increases from top to bottom.

[0026] Beneficial effects:

[0027] This utility model provides a wastewater and waste residue treatment system for kitchen grease tanks, which has the following beneficial effects: (1) By setting the fourth discharge pipe of the first grease tank to be connected to the second feeding pipe of the drain tank and the first return pipe of the cooking kettle respectively, the conveying direction of the unqualified grease can be flexibly selected according to the oil content of the unqualified grease in the first grease tank; when the oil content of the unqualified grease is too high, it is directly conveyed to the cooking kettle for secondary processing through the first return pipe; otherwise, it is sent to the drain tank for impurity removal through the second feeding pipe and then returned, so as to avoid the unqualified grease with high oil content from polluting the materials in the drain tank and to maximize the recycling rate of unqualified grease; (2) The first grease tank and the second grease tank are set up to store the stagnant grease and qualified finished oil after three-phase separation respectively, which effectively avoids the finished oil from contacting the impurities and wastewater and waste residue that are settled in the tank during the stagnant process, and prevents the finished oil from being contaminated and causing quality changes; (3) A scraping device is set in the first grease tank. The scraping device cleans the emulsion impurities in the tank regularly, without the need for manual tank entry or outsourced sewage treatment, reducing equipment maintenance costs. Attached Figure Description

[0028] Figure 1 A connection diagram of the wastewater and waste residue treatment system for kitchen grease tanks provided by this utility model;

[0029] Figure 2 A structural diagram of the wall scraping device inside the first grease tank in the wastewater and waste residue treatment system for kitchen grease tanks provided by this utility model;

[0030] Figure 3 A structural diagram of the wall scraping device outside the first grease tank in the wastewater and waste residue treatment system for kitchen grease tanks provided by this utility model;

[0031] Figure 4 This is a cross-sectional view of the first grease tank in the wastewater and waste residue treatment system for kitchen grease tanks provided by this utility model.

[0032] Figure 5 Structural diagram of the wall scraping device in the wastewater and waste residue treatment system of the kitchen grease tank provided by this utility model;

[0033] Figure 6 An exploded view of the scraper blade in the wastewater and waste residue treatment system for kitchen grease tanks provided by this utility model;

[0034] Figure 7 An exploded view of the rotating mechanism in the wastewater and waste residue treatment system for kitchen grease tanks provided by this utility model;

[0035] Figure 8 Structural diagram of the bushing in the wastewater and waste residue treatment system of the kitchen grease tank provided by this utility model;

[0036] Figure 9An exploded view of the drain tank in the wastewater and waste residue treatment system for kitchen grease tanks provided by this utility model;

[0037] Figure 10 The structural diagram of the drain tank in the wastewater and waste residue treatment system of the kitchen grease tank provided by this utility model.

[0038] Reference numerals: 1. Cooking kettle; 11. Third feeding pipe; 12. Second infusion pipe; 2. Three-phase separator; 21. First feeding pipe; 22. First discharge pipe; 23. Second discharge pipe; 24. Third discharge pipe; 3. Waste bin; 4. Wastewater tank; 41. Fifth discharge pipe; 42. Third infusion pipe; 5. First grease tank; 51. Fourth discharge pipe; 52. First return pipe; 53. Tank cover; 54. Guide section; 6. Second grease tank; 61. Oil drain pipe; 62. Oil infusion pipe; 7. Drainage tank; 71. Second feeding pipe; 72. Second return pipe; 73. Tank body; 74. Drainage rack; 75. Filter frame; 8. Wall scraping device; 81. Wall scraping paddle; 811. Spindle; 812. First scraper; 8121. Paddle handle; 8121. Mounting plate. 8122, scraper blade 8123, short column 8124, spring 8125, second scraper blade 813, lifting mechanism 82, movable plate 821, frame 822, slide bar 823, drive cylinder 824, rotating mechanism 83, drive motor 831, driven wheel 832, driving wheel 833, synchronous belt 834, bushing 84, keyway 841, transmission shaft 85, spline part 851, auxiliary frame 86, guide rod 861, auxiliary plate 862, auxiliary rod 863, sewage pipe 9, temporary storage tank 10, third return pipe 101, first infusion pipe 102, sight glass 20, heating device 30, insulation layer 40, annular water inlet pipe 50, nozzle 501. Detailed Implementation

[0039] This utility model provides a system for treating wastewater and waste residue from kitchen grease tanks. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes the utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0040] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0041] Please see Figures 1 to 10 The present invention provides a wastewater and sludge treatment system for kitchen waste grease tanks, comprising: a cooking kettle 1, a three-phase separator 2, a wastewater tank 4, a first grease tank 5, an oil delivery pipe 62, a drain tank 7, a wall scraping device 8, and a sewage pipe 9; the cooking kettle 1 is used to heat and cook the kitchen waste slurry after cooking and squeezing; the three-phase separator 2 is used to separate solid sludge, wastewater, and grease from the heated and cooked kitchen waste slurry; the three-phase separator 2 includes a first feed pipe 21, a second discharge pipe 23 for discharging wastewater, and a third discharge pipe 24 for discharging grease; the first feed pipe 21 is connected to the outlet end of the cooking kettle 1; the wastewater tank 4 is connected to the second discharge pipe 23 of the three-phase separator 2; the first grease tank 5 is used to store the grease separated by the three-phase separator 2, and the top of the first grease tank 5 is connected to the three-phase separator 2. The third discharge pipe 24 of the phase separator 2 is connected. The bottom of the first grease tank 5 is provided with a fourth discharge pipe 51, which is connected to the inlet end of the cooking kettle 1 through the first return pipe 52. The oil delivery pipe 62 is used to discharge finished oil and is connected to the fourth discharge pipe 51. The drain tank 7 is used to drain the wastewater and waste residue. The top of the drain tank 7 is provided with a second delivery pipe 71 connected to the fourth discharge pipe 51, and the bottom of the drain tank 7 is provided with a second return pipe 72, which is connected to the inlet end of the cooking kettle 1. The wall scraping device 8 is vertically mounted on the first grease tank 5. The output end of the wall scraping device 8 is provided with a rotatable wall scraping blade 81, which extends into the first grease tank 5 and acts on the inner wall and bottom of the first grease tank 5. The drain pipe 9 is connected to the fourth discharge pipe 51 of the first grease tank 5 and is used to discharge the emulsion impurities scraped from the first grease tank 5.

[0042] In the above embodiment, a waste bin 3 is also included, and the three-phase separator 2 is also included as a first discharge pipe 22 for discharging solid slag; the waste bin 3 is connected to the first discharge pipe 22 of the three-phase separator 2.

[0043] In the process of food waste treatment, the food waste slurry after being squeezed first enters the cooking kettle 1, and after being heated and cooked, it is transported to the first feeding pipe 21 of the three-phase separator 2. The three-phase separator 2 separates the cooked slurry into solid slag, wastewater and grease: the solid slag produced by separation enters the waste bin 3 for temporary storage through the first discharge pipe 22, the wastewater enters the wastewater tank 4 through the second discharge pipe 23 for further treatment, and the grease is transported to the first grease tank 5 for settling treatment through the third discharge pipe 24.

[0044] like Figure 1 , 2 As shown, a sight glass 20 is provided at one end of the fourth discharge pipe 51 near the first grease tank 5. Specifically, the sight glass 20 is a flange-type sight glass that can be directly installed in the fourth discharge pipe 51. When the liquid in the first grease tank 5 flows through the sight glass 20, the operator can directly observe the color of the liquid to judge the quality of the grease (the color of wastewater and waste residue with high water content is yellowish, while the color of finished oil is black), and control its processing path according to the state of the grease. After settling and stratifying, the grease in the first grease tank 5 undergoes two separate treatment paths: First, the lower layer of substandard grease (i.e., recycled wastewater and waste residue) is treated according to its oil content: when the grease content in the recycled wastewater and waste residue is too high, it is directly returned to the cooking kettle 1 for secondary processing through the fourth discharge pipe 51 and the first return pipe 52, preventing materials with excessively high oil content from entering the drain tank 7 and contaminating other materials in the tank, thus effectively improving the grease utilization rate; when the oil content of the recycled wastewater and waste residue meets the requirements for draining treatment, it enters the drain tank 7 through the fourth discharge pipe 51 and the second inlet pipe 71 at the top of the drain tank 7. The liquid after draining treatment returns to the cooking kettle 1 again through the second return pipe 72 at the bottom of the drain tank 7, forming a closed-loop treatment process for recycled wastewater and waste residue, effectively improving the recycling rate of grease in kitchen waste. Second, the upper layer of qualified finished oil is output to a designated location through the fourth discharge pipe 51 and the oil conveying pipe 62.

[0045] Furthermore, after prolonged standing, the inner wall and bottom of the first grease tank 5 are prone to accumulating emulsified impurities that are difficult to remove. During system shutdown, the wall scraping device 8 installed on the first grease tank 5 is activated, driving the wall scraping paddle 81 extending into the tank to rotate and continuously scrape away the emulsified impurities from the inner wall and bottom of the tank. In actual operation, clean water can also be added to the first grease tank 5 to assist in the scraping and removal of emulsified impurities. The scraped-off emulsified impurities are finally discharged to a designated location through the fourth discharge pipe 51 and the sewage pipe 9. Through the above-mentioned periodic self-cleaning method, the long-term accumulation of emulsified impurities can be avoided from contaminating the quality of the grease, and there is no need to entrust external agencies to clean it, which greatly reduces the cleaning difficulty and equipment maintenance costs.

[0046] The aforementioned installation of a sight glass 20 on the fourth discharge pipe 51 is existing technology, commonly used to directly observe the state of the liquid flowing through the pipe. In practical applications, operators can use their experience to make the following judgments based on the color of the grease after it has settled: firstly, to determine the oil content of the substandard grease in the lower layer, thereby controlling the flow of wastewater and waste residue to the cooking kettle 1 or the drain tank 7; secondly, to determine whether the substandard grease in the lower layer has completely flowed out of the first grease tank, thereby controlling the flow of the finished oil in the upper layer to the oil delivery pipe 62. In addition, during the cleaning of the first grease tank 5, operators can also observe the turbidity of the discharged water through the sight glass 20 to determine whether the first grease tank 5 has been cleaned.

[0047] In a preferred embodiment, a second grease tank 6 for storing finished oil is also included. The bottom of the second grease tank 6 is equipped with an oil drain pipe 61, and the top of the second grease tank 6 is connected to the oil delivery pipe 62. The qualified finished oil from the upper layer is transported to the second grease tank 6 for dedicated storage through the fourth drain pipe 51 and the oil delivery pipe 62, and can be directly discharged from the oil drain pipe 61 when ready for sale. By setting up two grease tanks, with the first grease tank 5 serving as a production tank and the second grease tank 6 serving as a storage tank, the operational flexibility for selling finished oil is improved, and the quality of the finished oil to be stored is prevented from changing due to external factors.

[0048] In a preferred embodiment, see [reference] Figure 1 The system also includes a temporary storage tank 10, with a third return pipe 101 at its bottom. The third return pipe 101 is connected to the second return pipe 72 of the drain tank 7 via a first infusion pipe 102, and is also connected to the inlet end of the cooking kettle 1. The temporary storage tank 10 is used to temporarily store the liquid processed by the drain tank 7. By using a buffer storage method, the material conveying speed is adjusted to balance the material conveying rhythm among the various tanks 73, such as the drain tank 7 and the cooking kettle 1, thus avoiding material accumulation or supply interruption due to differences in the processing efficiency of each device. After the dewatering tank 7 completes the dewatering treatment of unqualified grease (returned wastewater and waste residue), the resulting dewatered liquid first flows out through the second return pipe 72 at its bottom, and then enters the third return pipe 101 of the temporary storage tank 10 through the first liquid delivery pipe 102, and finally enters the temporary storage tank 10 for temporary storage. When the cooking kettle 1 needs to process these dewatered liquids for a second time, the liquid in the temporary storage tank 10 can be directly transported to the inlet end of the cooking kettle 1 through the third return pipe 101, and participate in the heating and cooking process together with the newly entered kitchen waste slurry to realize the recycling and reprocessing of materials.

[0049] Preferably, see Figure 1The cooking vessels 1 are configured as two, with identical structures and operating in parallel, which can improve the overall processing efficiency. Specifically, the inlet ends of the two cooking vessels 1 are respectively connected to a third feeding pipe 11, and the two third feeding pipes 11 are connected to each other through a second liquid delivery pipe 12, forming a dual-feed interconnected conveying structure; the second return pipe 72 of the drain tank 7 is connected to the third feeding pipe 11 of one of its cooking vessels 1, and the third return pipe 101 of the temporary storage tank 10 is connected to the third feeding pipe 11 of the other cooking vessel 1. The second return pipe 72 and the third return pipe 101 are both equipped with feed pumps, and valves are correspondingly installed on each pipe to realize the flexible delivery of the drained liquid to either cooking vessel 1.

[0050] In a preferred embodiment, see [reference] Figure 1 The wastewater tank 4 is equipped with a fifth discharge pipe 41 at its bottom, which is connected to the first return pipe 52 via a third infusion pipe 42. Correspondingly, the third infusion pipe 42 is also equipped with a feed pump and valves to control the wastewater transport status. Under normal operating conditions, the wastewater stored in the wastewater tank 4, separated by the three-phase separator 2, is transported to the sewage system for purification treatment according to a preset path. When the oil content of the wastewater in the wastewater tank 4 is abnormal, the feed pumps and valves on the relevant pipelines are controlled to transport the wastewater in the wastewater tank 4 through the fifth discharge pipe 41, the third infusion pipe 42, and the first return pipe 52 to the third feed pipe 11 of the cooking kettle 1, directly entering the cooking kettle 1 for secondary processing to recover the oil components.

[0051] In a preferred embodiment, see [reference] Figure 2-48. The first grease tank 5 is equipped with a lid 53 on top. The scraping device 8 further includes a lifting mechanism 82, a rotating mechanism 83, and a bushing 84. The bushing 84 is rotatably connected to the lid 53. The scraping paddle 81 is equipped with a drive shaft 85, which has a splined portion 851. The bushing 84 has a keyway 841 that is slidably connected to the splined portion 851. The rotating mechanism 83 is located on top of the lid 53 and is used to drive the bushing 84 to rotate, thereby driving the drive shaft 85 to rotate. The output end of the lifting mechanism 82 is equipped with a movable plate 821 that can slide up and down. The top of the drive shaft 85 is rotatably connected to the movable plate 821. During the grease settling process, the lifting mechanism 82 drives the movable plate 821 to move upward, thereby moving the scraping paddle 81 to the top of the first grease tank 5, preventing the scraping paddle 81 from being submerged in the grease for a long time. When it is necessary to clean the emulsified impurities adhering to the inside of the tank, the grease inside the tank is first emptied. Then, the rotating mechanism 83 is started and drives the bushing 84 to rotate around its own axis. Since the keyway 841 of the bushing 84 and the spline part 851 of the transmission shaft 85 form a sliding fit, the rotational torque of the bushing 84 is transmitted to the transmission shaft 85 through the spline structure, which drives the scraper 81 to rotate synchronously, thereby scraping the inner wall of the tank in the circumferential direction. At the same time, the lifting mechanism 82 drives the movable plate 821 to move downward. The spline part 851 slides axially along the keyway 841 of the bushing 84. The transmission shaft 85 descends synchronously with the movable plate 821, thereby driving the scraper 81 to move vertically while rotating, completing the comprehensive scraping of the tank wall at different heights. When the scraper 81 moves to the lowest position, the comprehensive scraping of the bottom of the first grease tank 5 is completed.

[0052] The combined lifting and rotating motion of the scraper blade 81 covers all areas of the inner wall and bottom of the first grease tank 5, thoroughly removing attached emulsion impurities and avoiding cleaning dead spots. The lifting mechanism 82 can flexibly adjust the height of the scraper blade 81 to adapt to different thicknesses of emulsion impurities accumulated inside the tank. Combined with the continuous operation of the rotating mechanism 83, it achieves automated deep cleaning of the first grease tank 5. Regular cleaning of emulsion impurities can prevent their residue and deterioration from affecting the quality of the grease. Moreover, the entire cleaning process does not require manual entry into the tank, resulting in high cleaning efficiency and significantly reducing maintenance costs.

[0053] Preferably, see Figure 4 , 7The lower surface of the tank cover 53 is provided with an annular water inlet pipe 50, which is connected to an external water source (or high-pressure cleaning equipment). The annular water inlet pipe 50 is equipped with several nozzles 501 arranged in a circular array. All nozzles 501 are angled towards the inner wall of the first grease tank 5, with some nozzles 501 slightly tilted downwards to accommodate the rinsing needs of the lower part of the tank wall. While the scraper 81 scrapes away emulsified impurities, clean water (or high-pressure water) is simultaneously introduced into the annular water inlet pipe 50. The water flow through each nozzle 501 forms a directional jet of water, evenly rinsing the inner wall of the first grease tank 5. After rinsing, the water flows downwards along the tank wall, carrying the emulsified impurities scraped off by the scraper 81 to the bottom of the tank for subsequent discharge through the drain pipe 9.

[0054] Further, see Figure 5 The movable plate 821 is provided with an auxiliary frame 86. The auxiliary frame 86 includes several guide rods 861 located at the bottom of the movable plate 821 and an auxiliary plate 862 fixedly connected to all the guide rods 861. The multiple guide rods 861 pass through the can lid 53 and are vertically slidably connected to the can lid 53. The auxiliary plate 862 is located below the can lid 53. The drive shaft 85 is rotatably connected to the auxiliary plate 862. By setting the guide rod 861 to slide vertically with the can cover 53, the auxiliary plate 862 moves up and down with the movable plate 821; while the drive shaft 85 is rotatably connected to the auxiliary plate 862, that is, a support point is added to the drive shaft 85, which, together with the top of the drive shaft 85 and the rotatable plate 821, improves the stability of the rotation of the drive shaft 85, thereby ensuring the stability of the movement of the scraper 81. This ensures that the scraper 81 maintains a stable trajectory when rotating and scraping and moving up and down, so as to improve the uniform scraping effect on the inner wall and bottom of the can, and avoid problems such as collision and wear between the scraper 81 and the can wall caused by shaking.

[0055] Preferably, see Figure 5 The auxiliary plate 862 is provided with several auxiliary rods 863 extending horizontally. When the can lid 53 and the top of the first grease tank 5 are not locked, the lifting mechanism 82 drives the movable plate 821 to move upward until the auxiliary plate 862 abuts against the lower surface of the can lid 53. At this time, if the movable plate 821 continues to move upward, the auxiliary plate 862 and the multiple auxiliary rods 863 will jointly lift the can lid 53 upward, so that the scraper 81 can be moved out of the first grease tank 5 for easy maintenance of the scraper 81.

[0056] See above. Figure 3 , 4The lifting mechanism 82 also includes a frame 822, a plurality of slide rods 823 mounted on the frame 822, and a drive cylinder 824 mounted on the top of the frame 822. The movable plate 821 is vertically slidably connected to the plurality of slide rods 823. The end of the extension rod of the drive cylinder 824 is fixed on the movable plate 821. The extension or retraction of the extension rod drives the movable plate 821 to slide up and down along the slide rods 823, thereby driving the transmission shaft 85 and the wall scraper 81 to move up and down synchronously.

[0057] In a preferred embodiment, see [reference] Figure 7 The rotating mechanism 83 includes a drive motor 831 mounted on the can cover 53 and a driven wheel 832 fixed on a bushing 84. The output end of the drive motor 831 is provided with a driving wheel 833, and a synchronous belt 834 is fitted on the driving wheel 833 and the driven wheel 832. After the drive motor 831 starts, it drives the driving wheel 833 to rotate. The driving wheel 833 transmits power to the driven wheel 832 through the synchronous belt 834, which in turn drives the bushing 84, which is fixedly connected to the driven wheel 832, to rotate synchronously. The bushing 84 then transmits the rotational torque to the transmission shaft 85 through the cooperation of its keyway 841 with the spline part 851 of the transmission shaft 85, which finally drives the scraper 81 to rotate, thereby realizing the scraping operation on the inner wall and bottom of the first grease tank 5.

[0058] In a preferred embodiment, see [reference] Figure 4 , 5 6. The bottom of the first grease tank 5 is provided with a funnel-shaped guide section 54, which facilitates the centralized guidance of grease, scraped emulsion impurities, cleaning wastewater, etc. to the fourth discharge pipe 51 and sewage pipe 9 located at the bottom of the first grease tank 5 for discharge, so as to avoid accumulation in the bottom of the tank. The scraping blade 81 includes a spindle 811, at least two first scrapers 812 arranged in a circumferential array on the spindle 811, and at least two second scrapers 813 arranged in a circumferential array on the spindle 811. The first scraper 812 acts on the inner wall of the first grease tank 5. The first scraper 812 extends vertically along the spindle 811, and its scraping end is in close contact with the inner wall of the first grease tank 5, which can scrape off the emulsion impurities attached to the inner wall. The second scraper 813 acts on the inner wall of the guide section 54. The second scraper 813 should be adapted to the tilt angle of the guide section 54, and its length should be consistent with the length of the inclined side of the guide section 54, so that its scraping end is in close contact with the inner wall of the guide section 54, and is specifically responsible for removing the emulsion impurities on the inner surface of the guide section 54. Multiple first scraper blades 812 and multiple second scraper blades 813 are staggered. In this embodiment, there are two first scraper blades 812 and two second scraper blades 813. That is, the first scraper blades 812 and the second scraper blades 813 are staggered at 90° in the circumferential direction, which can make the spindle 811 more evenly stressed when rotating, reduce vibration or shaking caused by excessive stress on one side, and improve the overall stability of the scraper blade 81.

[0059] Preferably, see Figure 6 The first scraper 812 includes a handle 8121, a mounting plate 8122, and a scraper blade 8123. The handle 8121 has a T-shaped structure. One end of the handle 8121 is fixed to the spindle 811, and the other end is slidably connected to the mounting plate 8122 through at least two short posts 8124. The scraper blade 8123 is locked to the mounting plate 8122 by screws. A spring 8125 is sleeved on each short post 8124, and the two ends of the spring 8125 abut against the handle 8121 and the mounting plate 8122, respectively. The elastic force of the spring 8125 continuously applies a pushing force to the mounting plate 8122, ensuring that the scraper 8123 always fits tightly against the inner wall of the first grease tank 5. When the scraper 8123 wears out due to long-term use, the spring 8125 will push the mounting plate 8122 to slide outward with the short column 8124, automatically compensating for the wear and ensuring that the scraping effect is not diminished. At the same time, the spring 8125 can buffer the rigid collision between the scraper 8123 and the tank wall, which can extend the service life of the scraper 8123.

[0060] The structure of the second scraper 813 is similar to that of the first scraper 812, and the structure of the first scraper 812 can be referred to in detail above.

[0061] In a preferred embodiment, see [reference] Figure 4 The system also includes a heating device 30 and an insulation layer 40. The heating device 30 includes a heat-conducting oil pipe wound around the outer wall of the first grease tank 5, and a heat-conducting oil heating device is connected to the outside of the heat-conducting oil pipe. The insulation layer 40 is installed on the outer wall of the first grease tank 5 and covers the heating device 30. When cleaning the first grease tank 5, after starting the external heat-conducting oil heating device, the temperature of the heat-conducting oil is adjusted to 50-70℃ (higher than the conventional grease insulation temperature and lower than the carbonization temperature of emulsified impurities). The heat-conducting oil circulates through the heat-conducting oil pipe, and the inner wall of the first grease tank 5 and the residual emulsified impurities are heated simultaneously through heat conduction through the tank wall. When heated, the intermolecular forces of the emulsified impurities weaken and their viscosity decreases. The first scraper 812 can more easily peel the softened emulsified impurities off the tank wall, and the second scraper 813 can also smoothly remove the emulsified impurities from the inner wall of the guide section 54. With the water flushing action of the annular water inlet pipe 50, the softened impurities that are scraped off will be more quickly gathered with the water flow to the guide section 54 for discharge, avoiding secondary adhesion of impurities in the tank.

[0062] It should be noted that thermal oil heating devices are a common existing technology in the industrial field, and most companies have already equipped themselves with them; therefore, their specific mechanisms and working principles will not be elaborated upon. The thermal oil heating device is not shown in the attached diagram.

[0063] In the above, the insulation layer 40 is made of insulation cotton, which has the effect of heat insulation and heat insulation. It wraps around the outer wall of the first grease tank 5 and completely covers the heat-conducting oil pipe, which can effectively block the heat exchange between the tank wall and the external environment and reduce the heat loss of the heating device 30.

[0064] In this embodiment, the second oil tank 6 may also be equipped with a wall scraping device 8, a heating device 30 and a heat insulation layer 40 to periodically clean the small amount of emulsified impurities attached to the tank, thereby ensuring the storage quality of the finished oil.

[0065] In a preferred embodiment, see [reference] Figure 9 , 10 The drain tank 7 includes a tank body 73 and a drain rack 74 disposed within the tank body 73. At least two filter frames 75 are vertically spaced on the drain rack 74, with the mesh size of the filter frames 75 gradually increasing from top to bottom. During operation, unqualified grease wastewater and residue enter the tank body 73 through the second discharge pipe 71 and fall onto the uppermost filter frame 75. The liquid (water and some grease) in the unqualified grease passes through multiple filter frames 75 sequentially under gravity, gradually permeating to the bottom of the tank body 73, and then returns to the cooking kettle 1 through the second return pipe 72 at the bottom of the tank body 73. Impurities of different particle sizes are intercepted by the corresponding mesh size filter frames 75 and remain on the corresponding filter frames 75, effectively improving draining efficiency and impurity removal accuracy.

[0066] In addition, multiple filter frames 75 are installed on the drain rack 74. When there are many impurities trapped on the filter frames 75, the entire drain rack 74 can be removed from the tank 73, the impurities can be cleaned, and then it can be reinstalled, which is convenient to operate.

[0067] It is understood that those skilled in the art can make equivalent substitutions or modifications based on the technical solution and inventive concept of this utility model, and all such substitutions or modifications should fall within the protection scope of the appended claims of this utility model.

Claims

1. A system for treating wastewater and waste residue from kitchen grease tanks, characterized in that, include: Cooking kettle (1) is used to heat the slurry of kitchen waste after cooking and pressing. Three-phase separator (2) is used to separate solid slag, wastewater and grease from the slurry of heated and cooked kitchen waste; the three-phase separator (2) includes a first feed pipe (21), a second discharge pipe (23) for discharging wastewater and a third discharge pipe (24) for discharging grease; the first feed pipe (21) is connected to the outlet end of the cooking kettle (1); Wastewater tank (4) is connected to the second discharge pipe (23) of the three-phase separator (2); The first oil tank (5) is used to store the oil separated by the three-phase separator (2). The top of the first oil tank (5) is connected to the third discharge pipe (24) of the three-phase separator (2). The bottom of the first oil tank (5) is provided with a fourth discharge pipe (51). The fourth discharge pipe (51) is connected to the inlet end of the cooking pot (1) through the first return pipe (52). The oil pipeline (62) is used to discharge finished oil, and the oil pipeline (62) is connected to the fourth discharge pipe (51); The drain tank (7) is used to drain the wastewater and waste residue. The top of the drain tank (7) is provided with a second discharge pipe (71) connected to the fourth discharge pipe (51). The bottom of the drain tank (7) is provided with a second return pipe (72). The second return pipe (72) is connected to the inlet end of the cooking kettle (1). A wall-scraping device (8) is vertically mounted on the first grease tank (5). The output end of the wall-scraping device (8) is equipped with a rotatable wall-scraping blade (81). The wall-scraping blade (81) extends into the first grease tank (5) and acts on the inner wall and bottom of the first grease tank (5). The drain pipe (9) is connected to the fourth drain pipe (51) of the first grease tank (5) and is used to discharge emulsion impurities scraped from the first grease tank (5).

2. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 1, characterized in that, It also includes a second oil tank (6) for storing finished oil products. The bottom of the second oil tank (6) is provided with an oil drain pipe (61), and the top of the second oil tank (6) is connected to the oil delivery pipe (62).

3. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 1, characterized in that, It also includes a temporary storage tank (10), the bottom of which is provided with a third return pipe (101). The third return pipe (101) is connected to the second return pipe (72) of the drain tank (7) through the first infusion pipe (102). The third return pipe (101) is connected to the inlet end of the cooking kettle (1).

4. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 1, characterized in that, The wastewater tank (4) is equipped with a fifth discharge pipe (41) at the bottom, and the fifth discharge pipe (41) is connected to the first return pipe (52) through the third infusion pipe (42).

5. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 1, characterized in that, The first oil tank (5) is provided with a lid (53) on the top. The scraping device (8) further includes a lifting mechanism (82), a rotating mechanism (83) and a bushing (84). The bushing (84) is rotatably connected to the lid (53). The scraping paddle (81) is provided with a drive shaft (85). The drive shaft (85) is provided with a spline (851). The bushing (84) is provided with a keyway (841) that is slidably connected to the spline (851). The rotating mechanism (83) is located on the top of the lid (53). The rotating mechanism (83) is used to drive the bushing (84) to rotate so as to drive the drive shaft (85) to rotate. The output end of the lifting mechanism (82) is provided with a movable plate (821) that can slide up and down. The top of the drive shaft (85) is rotatably connected to the movable plate (821).

6. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 5, characterized in that, The movable plate (821) is provided with an auxiliary frame (86). The auxiliary frame (86) includes several guide rods (861) located at the bottom of the movable plate (821) and an auxiliary plate (862) fixedly connected to all the guide rods (861). The multiple guide rods (861) pass through the can lid (53) respectively and are vertically slidably connected to the can lid (53). The auxiliary plate (862) is located below the can lid (53), and the drive shaft (85) is rotatably connected to the auxiliary plate (862).

7. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 5, characterized in that, The rotating mechanism (83) includes a drive motor (831) mounted on the can cover (53) and a driven wheel (832) fixed on the bushing (84). The output end of the drive motor (831) is provided with a driving wheel (833), and a synchronous belt (834) is fitted on the driving wheel (833) and the driven wheel (832).

8. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 1, characterized in that, The bottom of the first grease tank (5) is provided with a funnel-shaped flow guide (54). The wall scraper (81) includes a spindle (811), at least two first scrapers (812) arranged in a circumferential array on the spindle (811), and at least two second scrapers (813) arranged in a circumferential array on the spindle (811). The first scrapers (812) act on the inner wall of the first grease tank (5), and the second scrapers (813) act on the inner wall of the flow guide (54). The multiple first scrapers (812) and multiple second scrapers (813) are staggered.

9. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 1, characterized in that, It also includes a heating device (30) and an insulation layer (40). The heating device (30) includes a heat-conducting oil pipe that is wound around the outer wall of the first grease tank (5). The heat-conducting oil pipe is connected to a heat-conducting oil heating device. The insulation layer (40) is installed on the outer wall of the first grease tank (5) and covers the heating device (30).

10. The wastewater and waste residue treatment system for kitchen grease tanks according to claim 1, characterized in that, The drain tank (7) includes a tank body (73) and a drain rack (74) disposed inside the tank body (73). At least two filter frames (75) are arranged at intervals along the vertical direction on the drain rack (74), and the mesh count of the multiple filter frames (75) gradually increases from top to bottom.

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