Sewage pretreatment equipment for sewage treatment plants

Abstract

The present invention belongs to the technical field of sewage treatment equipment, and in particular relates to a sewage pretreatment device for a sewage treatment plant, comprising a sewage treatment tank for storing sewage to be treated; a guide cone rotatably mounted on the inner wall of the bottom of the sewage treatment tank, for guiding the oil in the sewage treatment tank to the top edge of the sewage treatment tank, and the diameter of the guide cone gradually decreases from top to bottom. In the sewage treatment process of the present invention, the oil can be concentrated in the outer area of ​​the annular filter under the action of the guide cone, thereby avoiding the problem of oil dispersion caused by the low oil content, and when the oil enters the guide trough, the oil particles in the guide trough can fuse with each other, and as the number of fused oil particles increases, the buoyancy of the oil particles themselves also gradually increases, so that the oil can be accelerated along the guide trough to the water surface outside the annular filter, thereby improving the efficiency of the oil floating to the surface.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment, and in particular relates to sewage pretreatment equipment for a sewage treatment plant. Background Art

[0002] Sewage pretreatment equipment is a special equipment used for preliminary treatment of raw sewage in sewage treatment systems. Its core function is to remove oil, impurities and pollutants in sewage that may affect the efficiency of subsequent treatment processes or damage equipment, and create stable and suitable conditions for subsequent deep treatment (such as biochemical treatment, membrane separation, etc.).

[0003] When existing sewage pretreatment equipment separates oil from sewage, the oil content is not fixed. When the oil content is high, the oil and sewage are clearly stratified, so the oil and sewage can be well separated. When the oil content is low, the oil will be more dispersed. Moreover, due to the low oil content, the fine oil particles take a long time to completely float out of the sewage, thereby reducing the sewage treatment efficiency.

[0004] Therefore, it is necessary to invent a sewage treatment plant sewage pretreatment equipment to solve the above problems. Summary of the Invention

[0005] In view of the above problems, the present invention provides a sewage pretreatment device for a sewage treatment plant to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a sewage pretreatment device for a sewage treatment plant, comprising:

[0007] Sewage treatment tank, used to store sewage to be treated;

[0008] A guide cone is rotatably mounted on the inner wall of the bottom of the sewage treatment tank, and is used to guide the oil in the sewage treatment tank to the top edge of the sewage treatment tank, and the diameter of the guide cone gradually decreases from top to bottom;

[0009] The spiral guide protrusion is fixedly connected to the outer side of the guide cone, and the bottom of the spiral guide protrusion is provided with a guide groove matching its length;

[0010] an annular filter, detachably connected to the top of the guide cone, for filtering sewage entering the inner side of the guide cone;

[0011] An oil collection tank, which is annular and fixedly sleeved on the top edge of the sewage treatment tank;

[0012] The oil-stain moving device is arranged on the inner side of the guide cone and is used for moving the oil-stain floating on the water surface to the outer side of the annular filter.

[0013] Furthermore, the oil-stain moving device comprises: a driving shaft, a fixing frame, a motor, a movable sleeve, a limiting ring, a moving bar and a floating bar;

[0014] The drive shaft is vertically rotatably mounted on the bottom inner wall of the sewage treatment tank;

[0015] The fixing frame is rotatably sleeved on the driving shaft near the top, and the fixing frame is fixedly connected to the bottom inner wall of the oil collection tank;

[0016] The motor drive is installed at the top end of the drive shaft;

[0017] The movable sleeve is slidably sleeved on a position of the driving shaft near the top end;

[0018] The limiting ring is located at the bottom of the movable sleeve, and the limiting ring is fixedly sleeved on the driving shaft;

[0019] The strips are arc-shaped and there are multiple strips. The strips are horizontally fixed to the outside of the movable sleeve and are evenly distributed in an annular shape. The free ends of the strips are close to the inner side of the annular filter.

[0020] There are multiple floating bars, each of which is fixedly connected to the bottom of each of the plurality of strips, and the buoyancy generated by the floating bars is greater than the gravity of the strips;

[0021] An air intake cavity is provided inside the driving shaft near the top end, and an air intake assembly is provided on the driving shaft.

[0022] Furthermore, the air intake assembly includes: a first sleeve, an air intake pipe, an air outlet pipe and an air injection pipe;

[0023] The first sleeve is located at the top of the movable sleeve and is rotatably sleeved on the drive shaft. A plurality of first connecting holes are formed through the position of the drive shaft facing the first sleeve, and the inner area of ​​the movable sleeve is connected to the air inlet cavity through the plurality of first connecting holes.

[0024] The air inlet pipe is horizontally connected to the outside of the first sleeve;

[0025] The air outlet pipe is L-shaped, and there are multiple air outlet pipes, and the multiple air outlet pipes are evenly distributed in an annular manner on the outside of the drive shaft. The top end of the air outlet pipe is fixedly connected to the drive shaft, and the air outlet pipe is communicated with the air inlet cavity;

[0026] There are multiple air jet pipes, each of which is horizontally connected to the bottom end of the air outlet pipe, and a plurality of air jet holes are evenly opened on the air jet pipe.

[0027] Furthermore, a plurality of flow guide components are evenly distributed in an annular shape on the outer side of the annular filter, and the flow guide components include: a flow guide box, a U-shaped movable plate, a floating block and a flow guide nozzle;

[0028] The guide box is fixedly connected to the outside of the annular filter screen at an angle, and a guide groove is provided on the top of the guide box, and the downward end of the guide groove is open. Heating resistance wires are provided on the bottom wall of the guide groove and the inner wall of the oil collection tank.

[0029] The U-shaped movable plate is slidably mounted on the inner side of the guide groove;

[0030] The floating block is fixedly connected to the bottom of the downward end of the U-shaped movable plate, and the buoyancy of the floating block is greater than the gravity of the U-shaped movable plate;

[0031] The guide nozzle is arranged on a side of the guide box away from the annular filter screen, and the free end of the guide nozzle is opposite to the inner side of the oil collection tank.

[0032] Furthermore, the bottom inner wall of the oil collection tank gradually slopes downward in a direction away from the sewage treatment tank, and an oil drain pipe is connected to the bottom of the oil collection tank.

[0033] Furthermore, a second sleeve is rotatably sleeved on the bottom of the guide cone, and a water outlet pipe is horizontally connected to the outer side of the second sleeve. The free end of the water outlet pipe is inserted into the side wall of the sewage treatment tank, and a plurality of second connecting holes are opened through the side wall of the guide cone opposite to the second sleeve.

[0034] Furthermore, a water inlet pipe is inserted horizontally through the side wall of the sewage treatment tank, and the water inlet pipe is close to the bottom of the sewage treatment tank.

[0035] Furthermore, a conical enclosure plate is provided on the periphery of the second sleeve, the conical enclosure plate is fixedly connected to the inner wall of the bottom of the sewage treatment tank, and the water inlet pipe is inserted through the side wall of the conical enclosure plate. The diameter of the conical enclosure plate gradually decreases from top to bottom, and there is a gap between the top of the conical enclosure plate and the outside of the guide cone.

[0036] Furthermore, the floating block is in the shape of a right triangle, and the inclined surface of the floating block is kept facing the direction of its movement, and the density of the floating block and the floating bar is between that of oil and water.

[0037] Technical effects and advantages of the present invention:

[0038] 1. The present invention is provided with a guide cone and a spiral guide protrusion. During the sewage treatment process, due to the presence of the guide cone, the oil can be concentrated on the water surface in the area outside the annular filter, thereby avoiding the problem of oil dispersion caused by a small amount of oil. When the oil enters the guide groove at the bottom of the spiral guide protrusion, the oil particles in the guide groove can merge with each other. As the number of oil particles merges increases, the buoyancy of the oil particles themselves gradually increases, thereby accelerating the oil to move along the guide groove to the water surface outside the annular filter, thereby improving the efficiency of the oil surfacing.

[0039] 2. The present invention is provided with an air jet pipe. During the oil separation process in the sewage treatment tank, air can be injected into the first sleeve through the air inlet pipe using an air pump or air compressor. The injected air can then be sprayed into the sewage through the air outlet pipe and the air jet pipe to form tiny bubbles. As the bubbles float upward under the action of buoyancy, when the bubbles come into contact with small particles of oil, the oil can be adsorbed on the surface of the bubbles, so that the oil can float upward along the guide groove with the bubbles, thereby improving the separation efficiency of oil and sewage.

[0040] 3. The present invention is provided with a guide box and a U-shaped movable plate. When the driving shaft drives the guide box and the U-shaped movable plate to move together through the annular filter, the U-shaped movable plate can shovel the oil and foam impurities floating on the top surface of the sewage, so that the oil and foam impurities can move upward along the U-shaped movable plate to the guide groove. Subsequently, the oil and foam impurities entering the guide groove can quickly enter the oil collection tank through the guide nozzle under the action of centrifugal force, thereby improving the collection efficiency of oil and foam impurities while avoiding clogging of the annular filter by a large amount of accumulated oil foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 It is a three-dimensional cross-sectional view of the sewage treatment tank, the oil collection tank and the conical enclosure in the present invention;

[0043] Figure 3 It is a three-dimensional schematic diagram of the guide cone, spiral guide protrusion, second sleeve and water outlet pipe in the present invention;

[0044] Figure 4 It is a three-dimensional schematic diagram of the diversion assembly in the present invention;

[0045] Figure 5 It is a three-dimensional schematic diagram of the movable sleeve, the shifting bar and the floating bar in the present invention;

[0046] Figure 6is a three-dimensional cross-sectional view of the drive shaft and the first sleeve in the present invention;

[0047] Figure 7 Schematic diagram of sewage pretreatment equipment according to another embodiment.

[0048] In the figure: 1. Sewage treatment tank; 2. Guide cone; 3. Spiral guide protrusion; 4. Annular filter; 5. Oil collection tank; 6. Drive shaft; 7. Fixed bracket; 8. Motor; 9. Movable sleeve; 10. Limiting ring; 11. Push bar; 12. Floating bar; 13. Air inlet cavity; 14. First casing; 15. Air inlet pipe; 16. Air outlet pipe; 17. Jet pipe; 18. Guide box; 19. U-shaped movable plate; 20. Floating block; 21. Guide nozzle; 22. Oil drain pipe; 23. Second casing; 24. Water outlet pipe; 25. Water inlet pipe; 26. Conical enclosure. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0050] The present invention provides Figures 1 to 7 The sewage treatment plant shown in the figure has a sewage pretreatment equipment, comprising: a sewage treatment tank 1, a guide cone 2, a spiral guide protrusion 3, an annular filter 4, an oil collection tank 5 and an oil toggle device. The sewage treatment tank 1 is used to store sewage to be treated; the guide cone 2 is rotatably mounted on the inner wall of the bottom of the sewage treatment tank 1, and is used to guide the oil in the sewage treatment tank 1 to the top edge of the sewage treatment tank 1. The diameter of the guide cone 2 gradually decreases from top to bottom, and the top of the guide cone 2 is lower than the top of the sewage treatment tank 1. The bottom of the guide cone 2 is rotatably sleeved with a second sleeve 23, and the outer side of the second sleeve 23 is horizontally connected to an outlet pipe 24. The free end of the outlet pipe 24 is inserted through the side wall of the sewage treatment tank 1. The side of the guide cone 2 A plurality of second connection holes are provided through the position where the wall is opposite to the second sleeve 23; the spiral guide protrusion 3 is fixedly connected to the outer side of the guide cone 2, and the bottom of the spiral guide protrusion 3 is provided with a guide groove matching its length; the annular filter 4 is detachably connected to the top of the guide cone 2, and is used to filter the sewage entering the inner side of the guide cone 2; the oil collection tank 5 is annular, and the oil collection tank 5 is fixedly sleeved on the top edge of the sewage treatment tank 1, and the bottom inner wall of the oil collection tank 5 gradually slopes downward away from the sewage treatment tank 1, and the bottom position of the oil collection tank 5 is connected to the oil drain pipe 22; the oil diverter device is provided on the inner side of the guide cone 2, and is used to divert the oil floating on the water surface to the outside of the annular filter 4;

[0051] The oil-stain removing device comprises: a driving shaft 6, a fixing frame 7, a motor 8, a movable sleeve 9, a limiting ring 10, a strip 11 and a floating strip 12; the driving shaft 6 is vertically rotatably mounted on the bottom inner wall of the sewage treatment tank 1; the fixing frame 7 is rotatably sleeved on the driving shaft 6 near the top, and the fixing frame 7 is fixedly connected to the bottom inner wall of the oil-stain collecting tank 5; the motor 8 is transmission-mounted on the top of the driving shaft 6; the movable sleeve 9 is slidably sleeved on the driving shaft 6 near the top; the limiting ring 10 is located at the bottom of the movable sleeve 9, and the limiting ring 10 is fixedly sleeved on the driving shaft 6; the strip 11 is an arc-shaped design, and the number of the strips 11 is multiple, and the multiple strips 11 are horizontally fixedly connected to the outer side of the movable sleeve 9, and the multiple strips 11 are evenly distributed in an annular shape, and the free end of the strip 11 is close to the inner side of the annular filter 4; the number of the floating strips 12 is multiple, and the multiple floating strips 12 are respectively fixedly connected to the bottom of the multiple strips 11, and the buoyancy generated by the floating strips 12 is greater than the gravity of the strips 11;

[0052] When the sewage is passed into the sewage treatment tank 1 from a position near the bottom of the sewage treatment tank 1, the oil in the sewage can float upward under the action of buoyancy, and some larger particles of oil can directly move upward along the outer side of the guide cone 2 to the water surface outside the annular filter 4 under the restriction of the guide cone 2, while smaller particles of oil can enter the guide groove on the bottom of the spiral guide protrusion 3 during the rising process. As the number of oil particles collected in the guide groove gradually increases, the oil particles in the guide groove can merge with each other to form larger particles of oil, and then the larger particles of oil can move upward along the guide groove under the action of buoyancy. In this process, the volume of the oil particles can become larger as the number of fused oil particles increases, and the buoyancy of the oil particles themselves also gradually increases, so that the oil can be accelerated to move along the guide groove to the water surface outside the annular filter 4, thereby improving the efficiency of the oil floating to the surface.

[0053] In addition, the oil can be concentrated on the water surface in the area outside the annular filter 4, thereby avoiding the problem of oil dispersion caused by a low oil content. Then, as the water level inside the sewage treatment tank 1 increases, the oil can overflow the sewage treatment tank 1 and flow into the oil collection tank 5. Finally, the oil can be collected through the oil discharge pipe 22, and the water in the sewage treatment tank 1 can enter the inner side of the guide cone 2 after being filtered by the annular filter 4. Then, the water inside the guide cone 2 can be discharged from the sewage treatment tank 1 through the second sleeve 23 and the outlet pipe 24 to enter the next sewage treatment link.

[0054] In addition, since part of the oil will pass through the annular filter 4 and enter its inner area during the process of filtering sewage through the annular filter 4, it is not conducive to the accumulation of oil. At this time, an oil-moving device is provided. During the sewage treatment process, the strip 11 can float at the interface between sewage and oil under the support of the floating bar 12. As the motor 8 starts, the motor 8 can drive the drive shaft 6 to rotate. As the drive shaft 6 rotates, the drive shaft 6 can drive multiple strips 11 to move along the surface of the sewage through the movable sleeve 9, so that the oil floating on the surface of the sewage flows to the outside of the annular filter 4, thereby preventing the oil from entering the inner area of ​​the annular filter 4.

[0055] like Figures 2 to 6 As shown, an air inlet cavity 13 is provided inside the driving shaft 6 near the top, and an air inlet assembly is provided on the driving shaft 6, which includes: a first sleeve 14, an air inlet pipe 15, an air outlet pipe 16 and an air jet pipe 17; the first sleeve 14 is located at the top of the movable sleeve 9, and the first sleeve 14 is rotatably sleeved on the driving shaft 6, and a plurality of first connecting holes are provided through the position opposite to the driving shaft 6 and the first sleeve 14, and the inner area of ​​the movable sleeve 9 and the air inlet cavity 13 are connected through a plurality of first connecting holes; the air inlet pipe 15 is horizontally connected to the outside of the first sleeve 14; the air outlet pipe 16 is L-shaped, and the number of the air outlet pipes 16 is multiple, and the multiple air outlet pipes 16 are evenly distributed in an annular manner on the outside of the driving shaft 6, the top of the air outlet pipe 16 is fixedly connected to the driving shaft 6, and the air outlet pipe 16 is connected to the air inlet cavity 13; the number of the air jet pipes 17 is multiple, and the multiple air jet pipes 17 are horizontally connected to the bottom end of the air outlet pipe 16 one by one, and a plurality of air jet holes are evenly provided on the air jet pipe 17;

[0056] When separating oil and dirt, some oil and dirt have small buoyancy due to their small particles. In addition, the sewage contains many impurities that will also block the oil and dirt, making it difficult to separate the oil and dirt from the sewage. At this time, by providing the jet pipe 17, in the process of separating the oil and dirt in the sewage treatment tank 1, air can be injected into the first sleeve 14 through the air inlet pipe 15 by using equipment such as an air pump or an air compressor. The injected air can then enter the air inlet cavity 13 through the first sleeve 14. The air in the air inlet cavity 13 can then be sprayed into the sewage through the air outlet pipe 16 and the jet pipe 17 in sequence to form tiny bubbles. As the bubbles float upward under the action of buoyancy, when the bubbles come into contact with the small particles of oil and dirt, the oil and dirt can be adsorbed on the surface of the bubbles, so that the oil and dirt can quickly float upward along the guide groove along with the bubbles, thereby improving the separation efficiency of oil and dirt.

[0057] In addition, when the drive shaft 6 rotates, the drive shaft 6 can drive the guide cone 2 to rotate through the air outlet pipe 16, and as the guide cone 2 rotates, the spiral guide protrusion 3 can rotate together with the guide cone 2, and as the spiral guide protrusion 3 rotates, the spiral guide protrusion 3 can drive the oil particles to move together through the friction between the guide groove and the oil particles, and the reaction force of water on the oil particles and the buoyancy effect can make the oil gradually move upward along the guide groove, and finally gather on the water surface in the outer area of ​​the annular filter 4, thereby improving the floating efficiency of the oil.

[0058] like Figures 1 to 4 As shown, a plurality of guide components are evenly distributed in an annular manner on the outside of the annular filter 4, and the guide components include: a guide box 18, a U-shaped movable plate 19, a floating block 20 and a guide nozzle 21; the guide box 18 is tilted and fixedly connected to the outside of the annular filter 4, and a guide groove is provided on the top of the guide box 18, and the downward end of the guide groove is open, and a heating resistance wire is provided on the bottom groove wall of the guide groove and the inner wall of the oil collection tank 5; the U-shaped movable plate 19 is slidably installed on the inner side of the guide groove; the floating block 20 is fixedly connected to the bottom of the downward end of the U-shaped movable plate 19, and the buoyancy of the floating block 20 is greater than the gravity of the U-shaped movable plate 19, the floating block 20 is a right triangle, and the inclined surface of the floating block 20 is kept opposite to its movement direction, and the density of the floating block 20 and the floating bar 12 is between oil and water; the guide nozzle 21 is arranged on the side of the guide box 18 away from the annular filter 4, and the free end of the guide nozzle 21 is opposite to the inner side of the oil collection tank 5;

[0059] In the process of separating oil from sewage, as the jet pipe 17 introduces air into the sewage, some oil and impurities will appear in a foamy state under the action of air. When the foamy oil and impurities gather in large quantities in the outer area of ​​the annular filter 4, the oil foam may clog the annular filter 4, affecting the filter effect. At this time, by providing the guide box 18 and the U-shaped movable plate 19, when the sewage treatment tank 1 is filled with sewage, the floating block 20 can float at the junction of the sewage and the oil. At this time, the bottom end of the U-shaped movable plate 19 can remain immersed in the oil, and the bottom end of the U-shaped movable plate 19 can not contact the sewage. When the drive shaft 6 drives the guide box 18 through the jet pipe 17, the guide box 18 and the U-shaped movable plate 19 can be kept in contact with the sewage. When the cone 2 rotates, the annular filter 4 can rotate together with the guide cone 2. At the same time, the guide box 18 and the U-shaped movable plate 19 can move together with the annular filter 4. In this process, the U-shaped movable plate 19 can shovel the oil and foam impurities floating on the top surface of the sewage, so that the oil and foam impurities can move upward along the U-shaped movable plate 19 into the guide groove. Subsequently, the oil and foam impurities entering the guide groove can quickly enter the oil collection tank 5 through the guide nozzle 21 under the action of centrifugal force, thereby improving the collection efficiency of the oil and foam impurities while avoiding the blockage of the annular filter 4 by a large amount of accumulated oil foam;

[0060] In addition, when the outdoor temperature is low, oil is prone to condensation, which causes the oil to accumulate in the guide groove and the oil collection groove 5, affecting the normal collection operation of the oil. At this time, by arranging a heating resistance wire on the bottom groove wall of the guide groove and the inner wall of the oil collection groove 5, when the oil condenses due to low temperature, the heating resistance wire can be started to heat the guide groove and the oil collection groove, so that the solidified oil can be in a flowing state, avoiding the accumulation of oil in the guide groove and the oil collection groove 5, and ensuring the collection efficiency of the oil.

[0061] like Figure 2 As shown, a water inlet pipe 25 is inserted horizontally through the side wall of the sewage treatment tank 1, and the water inlet pipe 25 is close to the bottom of the sewage treatment tank 1; a conical panel 26 is provided on the periphery of the second sleeve 23, and the conical panel 26 is fixedly connected to the inner wall of the bottom of the sewage treatment tank 1, and the water inlet pipe 25 is inserted through the side wall of the conical panel 26. The diameter of the conical panel 26 gradually decreases from top to bottom, and there is a gap between the top of the conical panel 26 and the outer side of the guide cone 2.

[0062] By providing a conical enclosure 26, when the sewage to be treated is injected into the sewage treatment tank 1 through the water inlet pipe 25, the sewage can enter the inner area of ​​the conical enclosure 26 through the water inlet pipe 25, and then the sewage can flow upward from the top gap of the conical enclosure 26 under the gathering action of the conical enclosure 26. In this process, the oil in the sewage can fully contact the spiral guide protrusion 3, and then the fine oil that enters the guide groove at the bottom of the spiral guide protrusion 3 can be quickly gathered under the action of the spiral guide protrusion 3. Then, the gathered oil can be quickly gathered along the guide groove to the outer area of ​​the annular filter 4 on the sewage surface as the guide cone 2 rotates under the action of buoyancy.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A sewage pretreatment equipment for a sewage treatment plant, characterized in that: include: A sewage treatment tank (1) for storing sewage to be treated; A guide cone (2) is rotatably mounted on the inner wall of the bottom of the sewage treatment tank (1) and is used to guide the oil in the sewage treatment tank (1) to the top edge of the sewage treatment tank (1), and the diameter of the guide cone (2) gradually decreases from top to bottom; The spiral guide protrusion (3) is fixedly connected to the outer side of the guide cone (2), and the bottom of the spiral guide protrusion (3) is provided with a guide groove matching its length; An annular filter (4) is detachably connected to the top of the guide cone (2) and is used to filter sewage entering the inner side of the guide cone (2); An oil collection tank (5), the oil collection tank (5) is annular and fixedly sleeved on the top edge of the sewage treatment tank (1); An oil-stain moving device, arranged inside the guide cone (2), for moving the oil-stain floating on the water surface toward the outside of the annular filter (4); The oil-stain shifting device comprises: a driving shaft (6), a fixing frame (7), a motor (8), a movable sleeve (9), a limiting ring (10), a shifting bar (11) and a floating bar (12); The drive shaft (6) is vertically rotatably mounted on the bottom inner wall of the sewage treatment tank (1); The fixing frame (7) is rotatably sleeved on a position near the top end of the driving shaft (6), and the fixing frame (7) is fixedly connected to the bottom inner wall of the oil collection tank (5); The motor (8) is transmission-mounted on the top end of the drive shaft (6); The movable sleeve (9) is slidably sleeved on a position close to the top end of the drive shaft (6); The limiting ring (10) is located at the bottom of the movable sleeve (9), and the limiting ring (10) is fixedly sleeved on the driving shaft (6); The strip (11) is designed to be arc-shaped, and there are multiple strips (11), multiple strips (11) are horizontally fixedly connected to the outside of the movable sleeve (9), and multiple strips (11) are evenly distributed in an annular shape, and the free ends of the strips (11) are close to the inner side of the annular filter (4); There are multiple floating bars (12), and the multiple floating bars (12) are respectively fixedly connected to the bottoms of the multiple shifting bars (11), and the buoyancy generated by the floating bars (12) is greater than the gravity of the shifting bars (11); An air intake cavity (13) is provided inside the drive shaft (6) near the top end, and an air intake assembly is provided on the drive shaft (6).

2. The sewage pretreatment equipment for sewage treatment plants according to claim 1, characterized in that: The air intake assembly comprises: a first sleeve (14), an air intake pipe (15), an air outlet pipe (16), and an air injection pipe (17); The first sleeve (14) is located at the top of the movable sleeve (9), and the first sleeve (14) is rotatably sleeved on the drive shaft (6). A plurality of first connecting holes are provided through the position where the drive shaft (6) and the first sleeve (14) face each other, and the inner area of ​​the movable sleeve (9) and the air inlet chamber (13) are connected through the plurality of first connecting holes. The air inlet pipe (15) is horizontally connected to the outside of the first sleeve (14); The air outlet pipe (16) is L-shaped, and there are multiple air outlet pipes (16). The multiple air outlet pipes (16) are evenly distributed in an annular shape on the outside of the drive shaft (6). The top end of the air outlet pipe (16) is fixedly connected to the drive shaft (6), and the air outlet pipe (16) is communicated with the air inlet chamber (13). There are multiple jet pipes (17), each of which is horizontally connected to the bottom end of the air outlet pipe (16), and a plurality of jet holes are evenly provided on the jet pipe (17).

3. The sewage pretreatment equipment for sewage treatment plants according to claim 2, characterized in that: A plurality of flow guide components are evenly distributed in an annular manner on the outside of the annular filter (4), and the flow guide components include: a flow guide box (18), a U-shaped movable plate (19), a floating block (20), and a flow guide nozzle (21); The guide box (18) is fixedly connected to the outside of the annular filter (4) at an angle, and a guide groove is provided on the top of the guide box (18), and the downward end of the guide groove is open. Heating resistance wires are provided on the bottom wall of the guide groove and the inner wall of the oil collection tank (5); The U-shaped movable plate (19) is slidably mounted on the inner side of the guide groove; The floating block (20) is fixedly connected to the bottom of the U-shaped movable plate (19) facing downward, and the buoyancy of the floating block (20) is greater than the gravity of the U-shaped movable plate (19); The guide nozzle (21) is arranged on a side of the guide box (18) away from the annular filter (4), and the free end of the guide nozzle (21) is directly opposite to the inner side of the oil collection tank (5).

4. The sewage pretreatment equipment for a sewage treatment plant according to claim 3, characterized in that: The bottom inner wall of the oil collection tank (5) gradually slopes downward in a direction away from the sewage treatment tank (1), and an oil drain pipe (22) is connected to the bottom of the oil collection tank (5).

5. The sewage pretreatment equipment for sewage treatment plants according to claim 4, characterized in that: A second sleeve (23) is rotatably sleeved on the bottom of the guide cone (2), and a water outlet pipe (24) is horizontally connected to the outside of the second sleeve (23). The free end of the water outlet pipe (24) is inserted through the side wall of the sewage treatment tank (1), and a plurality of second connection holes are formed through the side wall of the guide cone (2) at a position facing the second sleeve (23).

6. The sewage pretreatment equipment for a sewage treatment plant according to claim 5, characterized in that: A water inlet pipe (25) is inserted and passed horizontally through the side wall of the sewage treatment tank (1), and the water inlet pipe (25) is close to the bottom of the sewage treatment tank (1).

7. The sewage pretreatment equipment for a sewage treatment plant according to claim 6, characterized in that: A conical panel (26) is provided on the periphery of the second sleeve (23), the conical panel (26) being fixedly connected to the inner wall of the bottom of the sewage treatment tank (1), and the water inlet pipe (25) is inserted through the side wall of the conical panel (26), the diameter of the conical panel (26) gradually decreases from top to bottom, and a gap exists between the top of the conical panel (26) and the outer side of the guide cone (2).

8. The sewage pretreatment equipment for a sewage treatment plant according to claim 7, characterized in that: The floating block (20) is in the shape of a right triangle, and the inclined surface of the floating block (20) is kept facing the direction of its movement. The density of the floating block (20) and the floating bar (12) is between that of oil and water.

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