Industrial-grade mixed oil production wastewater treatment equipment

Abstract

The invention discloses industrial-grade mixed oil production wastewater treatment equipment, and relates to the field of wastewater treatment equipment.The industrial-grade mixed oil production wastewater treatment equipment comprises a hydraulic screen box, a positioning seat is fixedly installed on the circumferential inner wall of the hydraulic screen box, a screen drum is fixedly inserted into the positioning seat, and a water filtering plate is fixedly installed at the bottom of the screen drum; an unpowered self-rotating release scraping mechanism is mounted on the upper side of the interior of the water filtering plate, a backwashing mechanism is arranged at the bottom of the unpowered self-rotating release scraping mechanism, a backwashing disc is arranged on the backwashing mechanism, and a driving seat is fixedly mounted at the end part of the backwashing disc. According to the industrial-grade mixed oil production wastewater treatment equipment, the rotary motion of the blow-off pipe is converted into the scraping action of the scraping plate on the water filtering plate, automatic cleaning of the surface of the water filtering plate can be achieved without an additional power device or manual intervention, the labor cost and the energy consumption are reduced, and meanwhile the automation degree of a wastewater treatment system is also improved.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment equipment, in particular to industrial-grade mixed oil production wastewater treatment equipment. Background Art

[0002] Waste cooking oil refers to edible oil discarded after cooking, mainly the leftover oil from frying food in restaurants, homes and food processing points, or waste oil recovered from exhaust fans, swill oil, etc.; it is reported that my country can collect 6 to 8 million tons of waste cooking oil per year, and the current collection and utilization volume is 3 million tons per year; these waste cooking oils are raw materials for the production of industrial-grade mixed oils, which are mainly used as biodiesel feedstock; with the global shortage of fossil energy and the background of low-carbon emission reduction, the global transition to low-carbon energy has accelerated the development of the biodiesel industry; since waste cooking oil is a resource with an upper limit on production, the refining of industrial-grade mixed oil from waste cooking oil has good economic benefits and market prospects; however, in the development of waste cooking oil processing, the accompanying environmental Environmental pollution is becoming increasingly serious. The production of industrial-grade mixed oil includes processes such as water washing, filtration, vacuum dehydration, fatty acid removal, and vacuum deacidification (deodorization). The wastewater generated mainly includes water impurities, vacuum dehydration, and fatty acid removal circulation cooling wastewater. The main pollutants in this wastewater are large amounts of formic acid, acetic acid, fatty acids, cellulose, protein, and starch, as well as small amounts of animal and vegetable oils, mineral oils, and phospholipids. Testing has shown that the water quality of the wastewater varies, with COD ranging from 100,000 mg / L to 160,000 mg / L, SS from 10,000 mg / L to 50,000 mg / L, and a pH of 3.5 to 4.5. The wastewater generated during the production of industrial-grade mixed oil is characterized by high organic pollution, high oil content, low pH, high water temperature, and intermittent discharge, making it difficult to treat.

[0003] To address the above-mentioned issues, a Chinese patent application with publication number CN218860489U was found, which discloses a production wastewater treatment device for refining industrial-grade mixed oil from waste cooking oil. The device includes collecting the production wastewater in a regulating tank, uniformly mixing the water, and then conveying the production wastewater to a hydraulic screen via a first horizontal pipeline centrifugal pump. The production wastewater passes through the hydraulic screen to intercept large suspended solids and impurities in the production wastewater before entering an intermediate tank.

[0004] Although the above device can perform coarse filtration of sewage through a hydraulic screen, as the use time increases, solid impurities, fibers and other substances in the sewage are likely to accumulate on the screen, causing the screen to be blocked, affecting the water flow capacity and separation effect; sewage is likely to overflow the interior of the hydraulic screen. Summary of the Invention

[0005] The object of the present invention is to provide an industrial-grade mixed oil production wastewater treatment device to solve the defects mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, an industrial-grade mixed oil production wastewater treatment equipment is provided, comprising a hydraulic screen box, a positioning seat is fixedly installed on the circumferential inner wall of the hydraulic screen box, a screen cylinder is fixedly inserted into the interior of the positioning seat, a water filter plate is fixedly installed at the bottom of the screen cylinder, an unpowered self-spinning scraper mechanism is installed on the inner upper side of the water filter plate, a backwash mechanism is provided at the bottom of the unpowered self-spinning scraper mechanism, a backwash disc is provided on the backwash mechanism, a driving seat is fixedly installed at the end of the backwash disc, a sewage inlet cylinder is provided on the unpowered self-spinning scraper mechanism, a booster pipe is fixedly connected to the bottom of the sewage inlet cylinder, a connecting flange is fixedly provided on the top circumferential outer wall of the sewage inlet cylinder, and the sewage inlet cylinder is connected to the external production wastewater inlet pipe through the connecting flange at the top.

[0007] Furthermore, four groups of positioning blocks are evenly fixed on the outer side of the bottom circumference of the screen drum, and four groups of positioning grooves are evenly opened on the inner wall of the circumference of the positioning seat. The axial section of the hydraulic screen box, the positioning seat and the screen drum is a concentric circle structure; the sizes of the positioning blocks and the positioning grooves are matched, and positioning blocks are inserted into the inside of the four groups of positioning grooves.

[0008] Furthermore, the screen drum is positioned and installed inside the hydraulic screen box through four groups of positioning blocks and positioning slots. The positioning blocks and positioning slots are both isosceles trapezoidal in shape. The positioning blocks are inserted into the positioning slots and fixed by bolts.

[0009] Furthermore, the backwash mechanism includes a backwash disc, an atomizing nozzle, a drive seat, a rotating shaft, a reducer and a fixed seat. The interior of the backwash disc is hollow, and a water inlet pipe is installed at the bottom of the backwash disc. The water inlet pipe is connected to the external booster flushing pipe through a hose; the booster flushing pipe is sealed and inserted into the side wall of the hydraulic screen box.

[0010] Furthermore, the backwash disc is arranged in a circular shape and is arranged at the bottom of the water filter plate. The axial cross-section of the backwash disc and the water filter plate is a concentric circle structure. Multiple groups of atomizing nozzles are evenly installed on the surface of the backwash disc. The distance between adjacent groups of atomizing nozzles is consistent, and the backwash disc and the water filter plate are arranged relative to each other.

[0011] Furthermore, a rotating shaft is inserted and fixed in the driving seat at the end of the backwash disc, and the rotating shaft is movably connected to the inner wall of the hydraulic screen box. The end of the rotating shaft passes through the side wall of the hydraulic screen box through a bearing and is fixed to the output shaft of the reducer.

[0012] Furthermore, a fixing seat is installed at the bottom of the reducer, and the fixing seat is screwed and fixed on the circumferential outer wall of the hydraulic screen box. The reducer drives the backwash disc to rotate through the driving seat and the rotating shaft, and the rotation angle range of the backwash disc is 0-90 degrees.

[0013] Furthermore, the unpowered self-spinning scraper release mechanism includes a connecting flange, a sewage inlet barrel, a bearing seat, a connecting plate, a sewage discharge pipe, a reaction force pipe, a docking base, an assembly groove, a scraper, an assembly block and a boost pipe. Three groups of connecting plates are evenly fixed on the circumferential outer wall of the bearing seat. The connecting plates are trapezoidal in shape and have a through hole in the middle of the connecting plates.

[0014] Furthermore, an "L"-shaped fixing seat is provided at one end of the connecting plate away from the bearing seat, and the fixing seat is screwed on the inner wall of the circumference of the screen cylinder. The upper part of the boost pipe is connected to the sewage inlet cylinder, and five groups of sewage pipes are evenly installed on the outer wall of the circumference of the boost pipe. The five groups of sewage pipes are centrally symmetrical structures about the central axis of the sewage inlet cylinder.

[0015] Furthermore, the ends of the five groups of sewage pipes are fixedly provided with reaction force tubes, which are set in an "L" shape. The bottoms of the five groups of sewage pipes are fixedly provided with docking bases, and two groups of assembly grooves are opened on the docking bases. The interiors of the two groups of assembly grooves are interspersed with assembly blocks, which are clamped in the interiors of the assembly grooves and fixed by bolts. The assembly blocks and the assembly grooves are both circular. A scraper is fixedly provided at the bottom of the assembly block, and the five groups of scrapers cover the upper surface of the water filter plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention fixes reaction force pipes at the ends of the five groups of sewage pipes, so that when sewage is ejected from the interior of the reaction force pipes, the reaction force pipes and the sewage pipes rotate to stir the sewage inside the screen drum, thereby preventing large particles of impurities in the sewage from settling on the upper surface of the water filter plate. The reaction force generated when the sewage is ejected causes the reaction force pipes and the sewage pipes to rotate, thereby stirring the sewage inside the screen drum. This stirring method is relatively unique and efficient. Compared with traditional stirring devices, it may not require an additional power source, and the energy of the sewage discharge itself can be used to achieve the stirring function, saving energy. It effectively prevents large particles of impurities in the sewage from settling on the upper surface of the water filter plate. Impurity precipitation may cause the water filter plate to be blocked, affecting the filtering effect and sewage treatment efficiency, and keeping the water filter plate unobstructed makes the filtration process more stable and lasting.

[0018] 2. The present invention converts the rotational motion of the sewage pipe into a scraping action on the filter plate by scrapers. This automatically cleans the filter plate surface without the need for additional power devices or manual intervention, saving labor costs and energy consumption while also improving the automation level of the sewage treatment system. Six groups of scrapers are distributed around the filter plate. As the sewage pipe rotates, they can evenly scrape the filter plate surface, avoiding incomplete cleaning of localized areas and ensuring that impurities are effectively removed from all parts of the filter plate. This extends the overall service life of the filter plate and makes the sewage treatment system more stable and reliable. It also prevents impurities from accumulating on the screen, causing blockage and affecting the water flow capacity and separation effect.

[0019] 3. The present invention backwashes the filter plate by spraying water from multiple groups of atomizing nozzles on the surface of the backwash disk. The high-pressure water flow sprayed from the atomizing nozzles backwashes the filter plate, which can effectively remove impurities blocked in the filter plate mesh, restore the filter plate's permeability, ensure its filtering effect, extend the service life of the filter plate, and thus maintain the stable operation of the entire sewage treatment system. The multiple groups of atomizing nozzles on the surface of the backwash disk can evenly cover the surface of the filter plate with high-pressure water flow, avoiding blind spots in the flushing, ensuring that the mesh of each part of the filter plate is effectively flushed, completely clearing impurities, and improving the flushing effect.

[0020] 4. The present invention drives the backwash disc to rotate through the output shaft of the reducer. The backwash disc rotates so that the backwash disc and the hydraulic screen box are in a parallel state, which will not cause any obstruction to the sewage falling from the water filter plate; ensure that the sewage can flow smoothly in the equipment, maintain the normal operation of the sewage treatment process, and avoid sewage overflow and reduced treatment efficiency due to poor water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view schematic diagram of the structure of the present invention;

[0022] Figure 2 A bottom view of the structure of the present invention;

[0023] Figure 3 It is a rear view of the structure of the present invention;

[0024] Figure 4 It is a side view of the structure of the present invention;

[0025] Figure 5 A top view of the structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the backwash disc structure and its connection structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the unpowered self-spinning scraping mechanism of the present invention;

[0028] Figure 8 The structure of the present invention Figure 7 Bottom view of .

[0029] [reference numerals]

[0030] 1. Hydraulic screen box; 2. Positioning seat; 3. Positioning groove; 4. Screen cylinder; 5. Positioning block; 6. Water filter plate; 7. Backwash mechanism; 71. Backwash disc; 72. Atomizing nozzle; 73. Drive seat; 74. Rotating shaft; 75. Reducer; 76. Fixed seat; 8. Unpowered self-spinning release scraper mechanism; 80. Connecting flange; 81. Sewage inlet cylinder; 82. Bearing seat; 83. Connecting plate; 84. Sewage pipe; 841. Reaction force pipe; 85. Docking base; 86. Assembly groove; 87. Scraper; 88. Assembly block; 89. Booster pipe. DETAILED DESCRIPTION

[0031] Specific implementation method 1: Please refer to Figures 1-8 The present invention provides a technical solution: an industrial-grade mixed oil production wastewater treatment equipment, comprising a hydraulic screen box 1, a positioning seat 2 is fixedly installed on the circumferential inner wall of the hydraulic screen box 1, a screen drum 4 is fixedly inserted into the interior of the positioning seat 2, a water filter plate 6 is fixedly installed at the bottom of the screen drum 4, a non-powered self-spinning release scraper mechanism 8 is installed on the upper inner side of the water filter plate 6, a backwashing mechanism 7 is provided at the bottom of the non-powered self-spinning release scraper mechanism 8, a backwashing disc 71 is provided on the backwashing mechanism 7, a driving seat 73 is fixedly installed at the end of the backwashing disc 71, a sewage inlet cylinder 81 is provided on the sewage inlet cylinder 81, a boosting pipe 89 is fixedly connected to the bottom of the sewage inlet cylinder 81, a connecting flange 80 is fixedly provided on the top circumferential outer wall of the sewage inlet cylinder 81, and the sewage inlet cylinder 81 is connected to the external production wastewater inlet pipe through the connecting flange 80 at the top.

[0032] Working principle: During actual use, the sewage inlet cylinder 81 is connected to the external production wastewater inlet pipe through the connecting flange 80 at the top; the production wastewater impacts the interior of the sewage inlet cylinder 81 and enters the interior of the boosting pipe 89. Five groups of sewage discharge pipes 84 are evenly arranged on the outside of the boosting pipe 89. The ends of the five groups of sewage discharge pipes 84 are fixedly provided with reaction force pipes 841, so that when the sewage is ejected from the interior of the reaction force pipe 841, the reaction force pipe 841 and the sewage discharge pipe 84 rotate to stir the sewage inside the screen cylinder 4; prevent large particles of impurities in the sewage from settling on the upper surface of the water filter plate 6; the reaction force generated when the sewage is ejected makes The reaction force pipe 841 and the sewage pipe 84 rotate to stir the sewage inside the screen drum 4. This stirring method is relatively unique and efficient. Compared with traditional stirring devices, it may not require an additional power source. The stirring function can be achieved by using the energy of the sewage discharge itself, saving energy; it effectively prevents large particles of impurities in the sewage from settling on the upper surface of the water filter plate 6; impurity precipitation may cause the water filter plate 6 to be blocked, affecting the filtering effect and sewage treatment efficiency, keeping the water filter plate 6 unobstructed, making the filtration process more stable and lasting, extending the service life of the water filter plate 6, and reducing the frequency of cleaning and maintenance; the stirring effect makes the impurities in the sewage more evenly distributed, which is conducive to the subsequent treatment process. For example, when performing chemical treatment or biological treatment, the chemicals and sewage can be fully mixed, the treatment effect can be improved, and the performance and reliability of the entire sewage treatment system can be improved; when the sewage pipe 84 is rotating, the docking base 85 at the bottom thereof is positioned and installed through the assembly groove 86, the assembly block 88 and the scraper 87, so that the bottom of the six groups of scrapers 87 can scrape the surface of the water filter plate 6; when the sewage pipe 84 rotates, it drives the six groups of scrapers 87 to scrape the surface of the water filter plate 6, which can timely and effectively remove impurities accumulated on the water filter plate 6, prevent the accumulation of impurities from affecting the filtering effect of the water filter plate 6, maintain the transparency of the water filter plate 6, make the filtration process smoother, and improve sewage treatment. Efficiency and quality; by docking the base 85, the assembly groove 86, the assembly block 88 and the scraper 87 for positioning and installation, this connection method has a relatively simple structure, is easy to manufacture and install, and has a stable connection. It can ensure that during the rotation of the sewage pipe 84, the scraper 87 stably contacts the water filter plate 6 and performs the scraping work, reducing the possible failure points due to the complex structure and improving the reliability and stability of the entire device; the rotational motion of the sewage pipe 84 is converted into the scraping action of the scraper 87 on the water filter plate 6, and no additional power device or manual intervention is required, thereby achieving automatic cleaning of the surface of the water filter plate 6, saving labor costs and energy consumption, and also improving the degree of automation of the sewage treatment system;The six groups of scrapers 87 are distributed around the water filter plate 6. When the sewage pipe 84 rotates, they can evenly scrape the surface of the water filter plate 6 to avoid the situation where local areas are not cleaned in place, ensure that impurities in various parts of the water filter plate 6 can be effectively removed, extend the overall service life of the water filter plate 6, and make the sewage treatment system run more stably and reliably; when the hydraulic screen box 1 is used up, the water filter plate 6 needs to be cleaned. Since impurities are blocked in the mesh holes on the water filter plate 6, a water inlet pipe is installed at the bottom of the backwash disc 71. The water inlet pipe is connected to the external pressurized flushing pipe through a hose. The high-pressure water flows into the interior of the backwash disc 71 and is sprayed from the multiple groups of atomizing nozzles 72 on the surface of the backwash disc 71. Backwashing is performed; high-pressure water is ejected from the atomizing nozzle 72 to backwash the water filter plate 6, which can effectively remove impurities blocked in the mesh of the water filter plate 6, restore the permeability of the water filter plate 6, ensure its filtering effect, extend the service life of the water filter plate 6, and thus maintain the stable operation of the entire sewage treatment system; multiple groups of atomizing nozzles 72 are set on the surface of the backwashing disk 71, which can make the high-pressure water flow evenly cover the surface of the water filter plate 6, avoid the occurrence of flushing dead corners, ensure that the mesh of each part of the water filter plate 6 can be effectively flushed, comprehensively clean impurities, and improve the flushing effect; the water inlet pipe is connected to the external pressurized flushing pipe through a hose, so that the installation and arrangement of the backwashing mechanism 7 are more flexible, and the backwashing disk 71 can be adjusted according to actual needs. The position and angle are convenient for use with water filter plates 6 of different structures, and are also convenient for maintenance and inspection of the equipment; the atomizing nozzle 72 is used to spray water, and the water flow is sprayed out in an atomized state. Compared with ordinary nozzles, the atomized water flow can penetrate into the mesh of the water filter plate 6 more finely, and more effectively wash away the blocked impurities, and the impact force of the atomized water flow on the water filter plate 6 is relatively soft, which can reduce the damage to the water filter plate 6; after the backwash disk 71 is used, the external switch of the reducer 75 is started, and the output shaft of the reducer 75 drives the backwash disk 71 to rotate. The backwash disk 71 rotates so that the backwash disk 71 and the hydraulic screen box 1 are in a parallel state, which will not cause obstruction to the sewage falling from the water filter plate 6; ensuring that the sewage can The backwash disc 71 flows smoothly within the equipment, maintaining the normal operation of the sewage treatment process and avoiding problems such as sewage overflow and reduced treatment efficiency caused by poor water flow. If the backwash disc 71 is not rotated to a parallel state, it may be damaged due to the impact of falling sewage, which may affect its normal function and service life in the long run. Rotating it to a parallel state can reduce unnecessary external force impact, protect the structural integrity of the backwash disc 71 and the entire equipment, and reduce the maintenance cost and frequency of the equipment. The rotated backwash disc 71 is parallel to the hydraulic screen box 1, which can better fit the internal space of the equipment and will not occupy too much space, thereby improving the utilization rate of the internal space of the equipment and facilitating the compact layout of the equipment and the rationality of the overall design.Ensuring that sewage falls unimpeded helps optimize the entire sewage treatment process, making the transition of sewage between various treatment links smoother, improving the efficiency and stability of sewage treatment, and ensuring that the sewage treatment system can operate continuously and efficiently.

[0033] Specific embodiment 2: This embodiment is a further limitation of specific embodiment 1. Four groups of positioning blocks 5 are evenly fixedly installed on the outer side of the bottom circumference of the screen drum 4, and four groups of positioning grooves 3 are evenly opened on the inner wall of the circumference of the positioning seat 2. The axial section of the hydraulic screen box 1, the positioning seat 2 and the screen drum 4 is a concentric circle structure; the sizes of the positioning blocks 5 and the positioning grooves 3 are adapted, and the four groups of positioning grooves 3 are all plugged with positioning blocks 5.

[0034] Specific embodiment three: This embodiment is a further limitation of specific embodiment two. The screen drum 4 is positioned and installed inside the hydraulic screen box 1 through four groups of positioning blocks 5 and positioning grooves 3. The positioning blocks 5 and the positioning grooves 3 are both isosceles trapezoidal in shape. The positioning blocks 5 are inserted into the interior of the positioning grooves 3 and fixed by bolts.

[0035] Specific embodiment four: This embodiment is a further limitation of specific embodiment one. The backwash mechanism 7 includes a backwash disc 71, an atomizing nozzle 72, a drive seat 73, a rotating shaft 74, a reducer 75 and a fixed seat 76. The interior of the backwash disc 71 is hollow, and a water inlet pipe is installed at the bottom of the backwash disc 71. The water inlet pipe is connected to the external booster flushing pipe through a hose; the booster flushing pipe is sealed and inserted into the side wall of the hydraulic screen box 1.

[0036] Specific embodiment five: This embodiment is a further limitation of specific embodiment four. The backwash disk 71 is circular and is arranged at the bottom of the water filter plate 6. The axial cross-section of the backwash disk 71 and the water filter plate 6 is a concentric circle structure. Multiple groups of atomizing nozzles 72 are evenly installed on the surface of the backwash disk 71. The distance between two adjacent groups of atomizing nozzles 72 is consistent, and the backwash disk 71 and the water filter plate 6 are arranged relative to each other.

[0037] Specific embodiment six: This embodiment is a further limitation of specific embodiment four. A rotating shaft 74 is fixedly inserted into the driving seat 73 at the end of the backwash disc 71. The rotating shaft 74 is movably connected to the inner wall of the hydraulic screen box 1. The end of the rotating shaft 74 passes through the side wall of the hydraulic screen box 1 through a bearing and is fixed to the output shaft of the reducer 75.

[0038] Specific embodiment seven: This embodiment is a further limitation of specific embodiment six. A fixing seat 76 is installed at the bottom of the reducer 75, and the fixing seat 76 is screwed and fixed on the circumferential outer wall of the hydraulic screen box 1. The reducer 75 drives the backwash disc 71 to rotate through the drive seat 73 and the rotating shaft 74. The rotation angle range of the backwash disc 71 is 0-90 degrees.

[0039] Specific embodiment eight: This embodiment is a further limitation of specific embodiment one. The unpowered self-spinning scraper release mechanism 8 includes a connecting flange 80, a sewage inlet cylinder 81, a bearing seat 82, a connecting plate 83, a sewage discharge pipe 84, a reaction force pipe 841, a docking base 85, an assembly groove 86, a scraper 87, an assembly block 88 and a boost pipe 89. Three groups of connecting plates 83 are evenly fixed on the circumferential outer wall of the bearing seat 82. The connecting plates 83 are trapezoidal in shape and a through hole is opened in the middle of the connecting plates 83.

[0040] Specific embodiment nine: This embodiment is a further limitation of specific embodiment eight. An "L"-shaped fixing seat is provided at one end of the connecting plate 83 away from the bearing seat 82. The fixing seat is screwed onto the inner circumferential wall of the screen cylinder 4. The upper part of the boost pipe 89 is connected to the sewage inlet cylinder 81. Five groups of sewage pipes 84 are evenly installed on the outer circumferential wall of the boost pipe 89. The five groups of sewage pipes 84 are centrally symmetrical structures about the central axis of the sewage inlet cylinder 81.

[0041] Specific embodiment ten: This embodiment is a further limitation of specific embodiment nine, and the ends of the five groups of sewage pipes 84 are fixedly provided with reaction force pipes 841, and the reaction force pipes 841 are set in an "L" shape. The bottoms of the five groups of sewage pipes 84 are fixedly provided with docking bases 85, and two groups of assembling grooves 86 are opened on the docking bases 85. The interiors of the two groups of assembling grooves 86 are interspersed with assembling blocks 88, and the assembling blocks 88 are clamped in the interiors of the assembling grooves 86 and fixed by bolts. The assembling blocks 88 and the assembling grooves 86 are both circular in design, and a scraper 87 is fixedly provided at the bottom of the assembling block 88. Five groups of scrapers 87 cover the upper surface of the water filter plate 6.

Claims

1. An industrial grade mixed oil production wastewater treatment equipment, comprising a hydraulic screen box (1), characterized in that: A positioning seat (2) is fixedly mounted on the circumferential inner wall of the hydraulic screen box (1), a screen drum (4) is fixedly inserted into the interior of the positioning seat (2), a water filter plate (6) is fixedly mounted on the bottom of the screen drum (4), a non-powered self-spinning release scraping mechanism (8) is mounted on the upper inner side of the water filter plate (6), a backwashing mechanism (7) is arranged at the bottom of the non-powered self-spinning release scraping mechanism (8), a backwashing disc (71) is arranged on the backwashing mechanism (7), a driving seat (73) is fixedly mounted on the end of the backwashing disc (71), a sewage inlet cylinder (81) is arranged on the non-powered self-spinning release scraping mechanism (8), a boosting pipe (89) is fixedly connected to the bottom of the sewage inlet cylinder (81), a connecting flange (80) is fixedly mounted on the top circumferential outer wall of the sewage inlet cylinder (81), and the sewage inlet cylinder (81) is connected to an external production wastewater inlet pipe through the connecting flange (80) at the top.

2. The industrial grade mixed oil production wastewater treatment equipment according to claim 1, characterized in that: Four groups of positioning blocks (5) are evenly fixedly installed on the outer circumference of the bottom of the screen drum (4); four groups of positioning grooves (3) are evenly opened on the inner circumference of the positioning seat (2); the axial cross-section of the hydraulic screen box (1), the positioning seat (2) and the screen drum (4) is a concentric circle structure; the sizes of the positioning blocks (5) and the positioning grooves (3) are adapted to each other, and the insides of the four groups of positioning grooves (3) are all plugged with positioning blocks (5).

3. The industrial grade mixed oil production wastewater treatment equipment according to claim 2, characterized in that: The screen drum (4) is positioned and installed inside the hydraulic screen box (1) through four groups of positioning blocks (5) and positioning grooves (3), the positioning blocks (5) and the positioning grooves (3) are both isosceles trapezoidal, and the positioning blocks (5) are inserted into the positioning grooves (3) and fixed by bolts.

4. The industrial grade mixed oil production wastewater treatment equipment according to claim 1, characterized in that: The backwash mechanism (7) comprises a backwash disc (71), an atomizing nozzle (72), a driving seat (73), a rotating shaft (74), a speed reducer (75) and a fixing seat (76). The interior of the backwash disc (71) is hollow. A water inlet pipe is installed at the bottom of the backwash disc (71). The water inlet pipe is connected to an external pressurized flushing pipe through a hose. The pressurized flushing pipe is sealed and inserted into the side wall of the hydraulic screen box (1).

5. The industrial grade mixed oil production wastewater treatment equipment according to claim 4, characterized in that: The backwash disc (71) is circular and arranged at the bottom of the water filter plate (6). The axial sections of the backwash disc (71) and the water filter plate (6) are concentric circles. A plurality of groups of atomizing nozzles (72) are evenly installed on the surface of the backwash disc (71). The distance between two adjacent groups of atomizing nozzles (72) is consistent. The backwash disc (71) and the water filter plate (6) are arranged relative to each other.

6. The industrial-grade mixed oil production wastewater treatment equipment according to any one of claims 4 or 5, characterized in that: A rotating shaft (74) is inserted and fixed in the driving seat (73) at the end of the backwash disc (71). The rotating shaft (74) is movably connected to the inner wall of the hydraulic screen box (1). The end of the rotating shaft (74) passes through the side wall of the hydraulic screen box (1) through a bearing and is fixed to the output shaft of the speed reducer (75).

7. The industrial grade mixed oil production wastewater treatment equipment according to claim 6, characterized in that: A fixing seat (76) is installed at the bottom of the reducer (75), and the fixing seat (76) is screwed and fixed on the circumferential outer wall of the hydraulic screen box (1). The reducer (75) drives the backwash disc (71) to rotate through the driving seat (73) and the rotating shaft (74). The rotation angle range of the backwash disc (71) is 0-90 degrees.

8. The industrial grade mixed oil production wastewater treatment equipment according to claim 1, characterized in that: The unpowered self-spinning release scraping mechanism (8) comprises a connecting flange (80), a sewage inlet cylinder (81), a bearing seat (82), a connecting plate (83), a sewage discharge pipe (84), a reaction force pipe (841), a docking base (85), an assembly groove (86), a scraper (87), an assembly block (88) and a pressurizing pipe (89). Three groups of connecting plates (83) are evenly fixedly arranged on the circumferential outer wall of the bearing seat (82). The connecting plates (83) are arranged in a trapezoidal shape and have a through hole in the middle of the connecting plates (83).

9. The industrial-grade mixed oil production wastewater treatment equipment according to claim 8, characterized in that: An L-shaped fixing seat is provided at one end of the connecting plate (83) away from the bearing seat (82), and the fixing seat is screwed onto the inner circumferential wall of the screen cylinder (4). The upper portion of the boosting pipe (89) is connected to the sewage inlet cylinder (81), and five groups of sewage discharge pipes (84) are evenly installed on the outer circumferential wall of the boosting pipe (89). The five groups of sewage discharge pipes (84) are centrally symmetrical structures about the central axis of the sewage inlet cylinder (81).

10. The industrial-grade mixed oil production wastewater treatment equipment according to claim 9, characterized in that: The ends of the five groups of sewage pipes (84) are all fixedly provided with reaction force pipes (841), which are arranged in an "L" shape. The bottoms of the five groups of sewage pipes (84) are all fixedly provided with docking bases (85), and two groups of assembly grooves (86) are opened on the docking bases (85). The interiors of the two groups of assembly grooves (86) are interspersed with assembly blocks (88). The assembly blocks (88) are clamped in the interiors of the assembly grooves (86) and fixed by bolts. The assembly blocks (88) and the assembly grooves (86) are both circular. The bottoms of the assembly blocks (88) are fixedly provided with scrapers (87), and the five groups of scrapers (87) cover the upper surface of the water filter plate (6).

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