Multi-stage treatment equipment for waste engine oil processing sewage

Abstract

The invention discloses multi-stage treatment equipment for waste engine oil processing sewage, and relates to the technical field of sewage treatment. The treatment efficiency is improved; comprising a cylinder body and a flocculant feeding assembly, a center seat is fixed to the inner wall of the bottom of the cylinder body, a second sector plate is movably connected to the outer wall of the center seat, filter holes are formed in the surface of the second sector plate, a floating bag part is installed at the bottom of the second sector plate and connected with a pneumatic assembly, and a limiting groove is formed in the side wall of the center seat. A first clamping head is movably connected to the inner wall of the limiting groove, a driving ring is welded to the outer wall of the first clamping head, and a first sector plate is movably connected to the bottom of the driving ring. According to the floating bag, the height of the first fan-shaped plate and the height of the second fan-shaped plate in the vertical direction are adjusted in the inflating or deflating process of the floating bag body through buoyancy, so that when flocculent oil stains suspend on the surface layer of sewage, the flocculent oil stains and the sewage are separated after the first fan-shaped plate and the second fan-shaped plate are folded, and the flocculent oil stains are conveniently collected.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a multi-stage treatment device for waste oil processing sewage. Background Art

[0002] In the prior art, waste oil needs to be dehydrated and desalted during recycling. The wastewater generated during the recycling process needs to be treated to meet the standards before being discharged to ensure that it does not pollute the environment. Currently, there are many ways to treat the wastewater after waste oil processing, such as physical flotation, adsorption, and chemical flocculation.

[0003] After searching, the Chinese patent application number 202410740321.9 discloses a sewage treatment equipment with a multi-stage separation function of waste oil. It includes a base, the base is fixedly connected to an air float, the base is fixedly connected to a filtering device, the air float is fixedly connected to a slag shell, the slag shell is fixedly connected to a fixing frame, the fixing frame is fixedly connected to a mixing tube, the mixing tube is slidably connected to a liquid inlet pipe, the liquid inlet pipe is fixedly connected to a linear array of push plates, the push plates are provided with a circular array of liquid inlet holes, the mixing tube is provided with a linear and circular array of liquid outlet holes, and the mixing tube is rotatably connected to a slag push frame.

[0004] The multi-stage treatment equipment for waste oil processing wastewater in the above-mentioned patent has the following shortcomings: when the slag pushing rack pushes the flocculent oil into the slag shell, the flocculent oil is affected by water waves, so that part of the flocculent oil cannot completely enter the slag shell, making it impossible for the slag shell to completely collect the flocculent oil. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multi-stage treatment device for waste oil processing wastewater.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A multi-stage treatment device for waste oil processing wastewater comprises a cylinder and a flocculant delivery assembly, a center seat is fixed to the inner wall at the bottom of the cylinder, and a fan-shaped plate two is movably connected to the outer wall of the center seat, and filter holes are provided on the surface of the fan-shaped plate two, a float bag component is installed at the bottom of the fan-shaped plate two, and the float bag component is connected to a pneumatic assembly, a limiting groove is provided on the side wall of the center seat, and a clamp one is movably connected to the inner wall of the limiting groove, and a driving ring is welded to the outer wall of the clamp one, and a fan-shaped plate one is movably connected to the bottom of the driving ring.

[0008] Preferably, the float member comprises a float body and a support ring, a resistance plate is welded to the bottom of the second sector plate, the support ring is fixed to the outer wall of the bottom of the resistance plate through a connecting column, and the float body is bonded to the circumferential outer wall of the support ring.

[0009] Further: the flocculant delivery assembly includes a storage seat and a lifting plate, the storage seat is movably connected to the top outer wall of the lifting plate, and a loading hole is opened on the circumferential outer wall of the storage seat, and a filling pipe is installed on the top of the storage seat, and a strong magnet 1 is installed inside the lifting plate, and a strong magnet 2 is installed inside the fan-shaped plate 2.

[0010] Further: a spiral column is fixed to the inner wall of the central seat through a bracket, and a second clamping head used in conjunction with the spiral column is movably connected to the circumferential inner wall of the storage seat.

[0011] As a preferred solution of the present invention: the outer circumferential wall of the cylinder is movably connected with a slide rod, and a limiting head is welded at one end of the slide rod, and a spring is clamped between the inner wall of one side of the slide rod and the outer circumferential wall of the cylinder.

[0012] As a further solution of the present invention: the pneumatic assembly includes a connecting plate and a pneumatic box, the connecting plate is welded to the circumferential inner wall of the cylinder, and the pneumatic box is welded to one end of the connecting plate, and an air pipe is embedded in the through hole opened in the top of the pneumatic box, and the bottom of the air pipe is connected to the top of the spiral column through solenoid valve three, and multiple groups of air holes are opened on the outer wall of the spiral column.

[0013] As a further solution of the present invention: the outer wall of the trachea is connected to a solenoid valve 1 through a pipeline, and the solenoid valve 1 and the float bag body are connected through a bellows.

[0014] On the basis of the above scheme: the top of the cylinder is connected to ball valve 1 through a flange, and a filter is fixed to the end of ball valve 1 away from the cylinder, and the bottom of the cylinder is connected to a discharge pipe through a flange, and ball valve 2 is fixed to one end of the discharge pipe.

[0015] On the basis of the above scheme: the bottom of the pneumatic box is movably connected with a fan blade, and the bottom of the fan blade is welded with a scraper through a bent rod, the outer wall of the air pipe is connected with a solenoid valve 2 through a thread, and a nozzle is fixed at one end of the solenoid valve 2.

[0016] On the basis of the above-mentioned solution: the top of the spiral column is movably connected with a fixing ring, and the bottom of the fixing ring is movably connected with an electromagnet.

[0017] The beneficial effects of the present invention are:

[0018] 1. A multi-stage treatment device for waste oil processing wastewater, which uses buoyancy to enable the float bag body to adjust the height of the fan-shaped plate 1 and the fan-shaped plate 2 in the vertical direction during the inflation or deflation process, so that when the flocculent oil pollution is suspended on the surface of the sewage, the fan-shaped plate 1 and the fan-shaped plate 2 can be closed to separate the flocculent oil pollution and the sewage, which is convenient for collecting the flocculent oil pollution.

[0019] 2. A multi-stage treatment equipment for waste oil processing wastewater, which can extend the floating time of the float bag body during the inflation process by setting a limited position head and a spring. When a certain amount of gas is filled into the float bag body, the rate at which the float bag body moves upward is accelerated, so that the flocculant in the storage seat is thrown out through the feeding hole faster under the action of centrifugal force, so that the flocculant and sewage are evenly mixed.

[0020] 3. A multi-stage treatment device for waste oil processing wastewater, which can guide the moving path of fan-shaped plate one by setting a limit groove, so that fan-shaped plate two and fan-shaped plate one can be closed after moving to a certain height, avoiding the accumulation of a large amount of wastewater on the upper layers of fan-shaped plate one and fan-shaped plate two.

[0021] 4. A multi-stage treatment device for waste oil processing wastewater. When solenoid valve 2 is opened, gas is discharged through the nozzle and blows the fan blades. During the rotation of the fan blades, the scraper is driven to rotate along the surface of fan plate 1 and fan plate 2 to scrape the flocculent oil.

[0022] 5. A multi-stage treatment device for waste oil processing wastewater, which forms a complete plane by arranging the fan-shaped plate 1 and the fan-shaped plate 2 to be closed together, so that the scraper can concentrate and accumulate the flocculent oil during the rotation process, thereby reducing the difficulty of cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0024] Figure 2 It is a main body cross-sectional structural schematic diagram of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0025] Figure 3 It is a schematic diagram of the main structure of the first state of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0026] Figure 4 It is a schematic diagram of the second state structure of the main body of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0027] Figure 5 It is a schematic diagram of the installation structure of the first sector plate and the second sector plate of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0028] Figure 6 It is a schematic diagram of the explosion structure of the first sector plate and the second sector plate of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0029] Figure 7It is a schematic diagram of the closed structure of the first sector plate and the second sector plate of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0030] Figure 8 It is a schematic diagram of the overall structure of the pneumatic components of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0031] Fig. 9 It is a schematic diagram of the installation structure of a flocculant spraying mechanism of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0032] Fig.10 It is a schematic diagram of the exploded structure of the pneumatic components of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention;

[0033] Fig.11 It is a partial structural schematic diagram of the pneumatic components of a multi-stage treatment device for waste oil processing wastewater proposed by the present invention.

[0034] In the figure: cylinder 1; connecting plate 2; pneumatic box 3; filter element 4; ball valve 1 5; discharge pipe 6; ball valve 2 7; center seat 8; bellows 9; sector plate 1 10; sector plate 2 11; filter hole 12; float body 13; support ring 14; scraper 15; fixing ring 16; electromagnet 17; limit head 18; spring 19; slide bar 20; air pipe 21; solenoid valve 1 22; spiral column 23; bent rod 24; limit groove 25; storage seat 26; lifting plate 27; drive ring 28; clamp head 1 29; connecting column 30; contact ring 31; feeding hole 32; fan blade 33; solenoid valve 2 34; nozzle 35; clamp head 2 36; solenoid valve 3 37; air hole 38. DETAILED DESCRIPTION

[0035] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] Embodiment 1:

[0038] A multi-stage treatment device for waste oil processing wastewater, such as Figures 1 to 11As shown, it includes a cylinder 1 and a flocculant delivery assembly, wherein a center seat 8 is fixed to the inner wall of the bottom of the cylinder 1 by bolts, and a sector plate 11 is slidably connected to the outer wall of the center seat 8, and a filter hole 12 is provided on the surface of the sector plate 11, a float bag is installed at the bottom of the sector plate 11, and the float bag is connected to the pneumatic assembly, a limiting groove 25 is provided on the side wall of the center seat 8, and a clamp 29 is slidably connected to the inner wall of the limiting groove 25, and a driving ring 28 is welded to the outer wall of the clamp 29, and a sector plate 10 is fixed to the bottom of the driving ring 28 by screws;

[0039] By providing the cylinder 1, sewage that needs to be treated can be stored. In the initial stage, no gas is filled into the float bag, so that the float bag and the fan-shaped plate 2 11 are at the bottom of the cylinder 1 under the action of their own gravity, and the limit groove 25 is used to guide the moving path of the clamp 1 29, so that the fan-shaped plate 10 is in contact with the top of the fan-shaped plate 2 11 under the action of its own gravity, and there is a certain gap between the fan-shaped plate 10 and the fan-shaped plate 2 11 at this time. In this embodiment, the number of fan-shaped plates 10 and fan-shaped plates 2 11 is two groups. When treating sewage, the flocculant is introduced into the cylinder 1 by the flocculant delivery component, and the oil in the sewage is flocculated by the flocculant. After flocculation, the sewage can be inflated by the pneumatic component. The bubbles generated after inflation can push the flocculated oil to move to the upper layer of the sewage and be suspended. When the flocculated oil needs to be collected, the pneumatic component is used to inflate the float bag, and the float bag is inflated after air intake. The buoyancy of the buoyancy bag is 10, and the buoyancy bag is 10. The ... During the process, the fan plate 10 is driven to rotate. During this process, the fan plate 10 rotates relative to the fan plate 2 11. When the fan plate 10 rotates to align with the notch on the fan plate 2 11, the clamp head 29 moves to the end of the limit groove 25. At this time, the limit groove 25 limits the clamp head 29, so that the fan plate 10 no longer moves. When the fan plate 2 11 continues to rise under the action of buoyancy, the notch on the fan plate 2 11 is clamped into the outer wall of the fan plate 10, and finally a shape as shown in the figure is formed. Figure 7In the form shown, the fan-shaped plate 10 and the fan-shaped plate 2 11 form a circular sealing structure to separate the suspended oil and the treated sewage, and then a certain volume of the treated sewage is discharged first, and the discharge is stopped when the sewage level is flush with the bottom of the float bag. In this process, a small amount of sewage remaining on the upper part of the fan-shaped plate 10 and the fan-shaped plate 2 11 is filtered out through the filter hole 12, and the fan-shaped plate 2 11 intercepts the flocculent oil. When the sewage is filtered out, the flocculent oil on the fan-shaped plate 10 and the fan-shaped plate 2 11 can be cleaned.

[0040] The float bladder member includes a float bladder body 13 and a support ring 14. A contact plate 31 is welded to the bottom of the sector plate 11. The support ring 14 is fixed to the outer wall of the bottom of the contact plate 31 through a connecting column 30, and the float bladder body 13 is bonded to the outer wall of the circumference of the support ring 14.

[0041] When a certain amount of gas is filled into the float bladder body 13 , the float bladder body 13 and the support ring 14 drive the sector plate 2 11 to move along the center seat 8 by utilizing the buoyancy.

[0042] The flocculant delivery assembly includes a storage seat 26 and a lifting plate 27, wherein the storage seat 26 is rotatably connected to the top outer wall of the lifting plate 27, and a feeding hole 32 is provided on the circumferential outer wall of the storage seat 26, and a filling pipe is installed on the top of the storage seat 26, and a strong magnet 1 is installed inside the lifting plate 27, and a strong magnet 2 is installed inside the sector plate 2 11;

[0043] The flocculant can be added to the storage seat 26 through the filling pipe on the storage seat 26. When the float bag is not filled with gas, the fan-shaped plate 2 11 uses the attraction between the strong magnet 1 and the strong magnet 2 to make the lifting plate 27 move synchronously along the inner surface of the center seat 8 during the process of moving to the bottom of the cylinder 1, so that the lifting plate 27 and the storage seat 26 also move to the bottom of the center seat 8. After moving to the bottom of the center seat 8, the center seat 8 is used to temporarily block the feeding hole 32 to ensure that before the sewage is completely injected into the cylinder 1, the sewage is prevented from contacting the flocculant inside the storage seat 26 through the feeding hole 32;

[0044] When the sewage to be treated is injected, the pneumatic component is used to inflate the float bag. The fan-shaped plate 11 is driven by magnetic force to move synchronously with the lifting plate 27 and the storage seat 26 during the upward movement. The feeding hole 32 is in full contact with the sewage at different depths during the upward movement, so that the flocculant is evenly mixed with the sewage through the feeding hole 32, thereby improving the treatment effect of the flocculant on the sewage.

[0045] The inner wall of the central seat 8 is fixed with a spiral column 23 through a bracket, and the inner wall of the storage seat 26 is fixed with a second clamp 36 used in conjunction with the spiral column 23 through screws;

[0046] The outer circumferential wall of the cylinder 1 is slidably connected with a slide rod 20, and a limit head 18 is welded at one end of the slide rod 20, and a spring 19 is clamped between the inner wall of one side of the slide rod 20 and the outer circumferential wall of the cylinder 1;

[0047] In this embodiment, the longitudinal section of the limit head 18 is an isosceles trapezoid. When the float bag is inflated, the outer wall of the top of the support ring 14 gradually increases the pressure between the outer walls of the limit head 18 under the action of buoyancy. During this process, the spring 19 is in a gradually stretched state. However, since the limit head 18 limits the support ring 14, the inside of the support ring 14 is still located at the bottom of the cylinder 1 before a certain amount of gas is filled. As the amount of gas filled into the support ring 14 continues to increase, the buoyancy finally overcomes the elastic force of the spring 19, and the support ring 14 is detached from the limit head 18. At this time, the main body of the float bag 13 and the support ring 14 will move upward rapidly under the action of buoyancy, and during the upward movement, the clamp head 36 will move along the spiral groove on the spiral column 23. The spiral groove and the clamp head 36 will allow the storage seat 26 to rotate during the upward movement. Since the storage seat 26 moves at a fast speed, the storage seat 26 rotates at a relatively fast speed during the rotation process, so that the flocculant in the storage seat 26 is thrown out under the action of centrifugal force, thereby increasing the movement range of the flocculant, so that the flocculant can be more fully mixed with the sewage close to the inner wall of the cylinder 1.

[0048] The pneumatic assembly includes a connecting plate 2 and a pneumatic box 3, wherein the connecting plate 2 is welded to the inner wall of the cylinder 1, and the pneumatic box 3 is welded to one end of the connecting plate 2, and an air pipe 21 is embedded in a through hole opened at the top of the pneumatic box 3, and the bottom of the air pipe 21 is connected to the top of the spiral column 23 through a solenoid valve 37, and a plurality of air holes 38 are opened on the outer wall of the spiral column 23;

[0049] During treatment, the top of the air pipe 21 is connected to equipment such as an air pump. When the solenoid valve 37 is opened, the gas is input into the spiral column 23 through the air pipe 21, and finally ejected through the air hole 38. The gas is used to push the flocculated oil to the upper layer of the sewage, so that it is in a suspended state.

[0050] The outer wall of the air pipe 21 is connected to a solenoid valve 22 through a pipeline, and the solenoid valve 22 and the floating bag body 13 are connected through a bellows 9;

[0051] When the electromagnetic valve 22 is opened, gas can be injected into the float body 13 through the bellows 9, so that the float body 13 gradually expands after the air is taken in. After inflation, the electromagnetic valve 22 is closed to prevent gas backflow.

[0052] The top of the cylinder 1 is connected to a ball valve 5 via a flange, and a filter element 4 is fixed to the end of the ball valve 5 away from the cylinder 1;

[0053] By providing a filter element 4, larger particles and impurities in the sewage can be filtered and retained. A filter plate is installed inside the filter element 4 to achieve filtering and retention. After the ball valve 5 is opened, the filtered sewage enters the cylinder 1 for further treatment.

[0054] The bottom of the cylinder 1 is connected to a discharge pipe 6 via a flange, and one end of the discharge pipe 6 is fixed with a ball valve 7 via bolts;

[0055] After the ball valve 2 7 is opened, the treated sewage can be discharged.

[0056] A fixing ring 16 is fixed to the top of the spiral column 23 by screws, and an electromagnet 17 is fixed to the bottom of the fixing ring 16 by screws;

[0057] When the clamping head 29 moves to the end of the limit groove 25, the driving ring 28 and the electromagnet 17 are fitted together, and the electromagnet 17 adsorbs and fixes the driving ring 28 after being energized. The electromagnet 17 is provided to ensure that when the fan plate 10 and the fan plate 2 11 need to be moved back to the bottom of the cylinder 1, the fan plate 2 11 moves down first and then the fan plate 10 moves down again after the electromagnet 17 is powered off, thereby avoiding the fan plate 10 and the fan plate 2 11 from getting stuck.

[0058] When the present embodiment is used, a certain amount of flocculant is first added to the storage seat 26, and then the sewage is preliminarily filtered by the filter element 4 and then introduced into the cylinder 1 through the ball valve 15, and then the float body 13 is inflated by the bellows 9. The float body 13 gradually expands after the air is taken in. When the elastic force of the spring 19 cannot overcome the buoyancy, the float body 13 and the support ring 14 drive the storage seat 26 to move rapidly in the vertical direction under the action of the buoyancy. The storage seat 26 can also rotate itself by using the clamp 236 and the spiral column 23 during the movement. The storage seat 26 uses the centrifugal force to throw out the flocculant during the rotation. The flocculant and the sewage are mixed to separate the flocculated oil. Then the float body 13 is inflated. The float body 13 is deflated, and after deflation, the fan-shaped plate 10 and the fan-shaped plate 2 11 are moved back to the bottom of the cylinder 1, and then a period of time is waited for the flocculant and the sewage to fully contact each other. When the set time is reached, the float body 13 is expanded again according to the above steps, and the fan-shaped plate 10 and the fan-shaped plate 2 11 continue to move upward. When the clamp 1 29 moves to the end of the limit groove 25, the fan-shaped plate 10 rotates a certain angle relative to the fan-shaped plate 2 11, so that the fan-shaped plate 10 and the fan-shaped plate 2 11 are engaged with each other. At this time, the fan-shaped plate 10 and the fan-shaped plate 2 11 separate the flocculent oil stains from the treated sewage, and the remaining small amount of sewage is filtered out through the filter hole 12, and then the flocculent oil stains on the fan-shaped plate 10 and the fan-shaped plate 2 11 can be cleaned.

[0059] Embodiment 2:

[0060] A multi-stage treatment device for waste oil processing wastewater, such as Figures 1 to 11 As shown, in order to facilitate the cleaning of flocculent oil, this embodiment makes the following supplements on the basis of embodiment 1: the bottom of the pneumatic box 3 is rotatably connected with a fan blade 33, and the bottom of the fan blade 33 is welded with a scraper 15 through a bent rod 24, the outer wall of the air pipe 21 is connected with a solenoid valve 2 34 through a thread, and a nozzle 35 is fixed at one end of the solenoid valve 2 34;

[0061] When it is necessary to clean the flocculent oil stains on the fan plate 10 and the fan plate 2 11, the solenoid valve 2 34 is opened to allow the gas to be discharged through the nozzle 35 and then blow the fan blade 33. During the rotation process, the fan blade 33 drives the scraper 15 to rotate along the surface of the fan plate 10 and the fan plate 2 11 to scrape the flocculent oil stains, so that the flocculent oil stains are accumulated together more concentratedly, reducing the difficulty of cleaning.

[0062] The above is a preferred specific implementation manner of the present invention, and the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the field within the technical scope disclosed by the present invention in combination with the prior art or public common sense, within the spirit and principle of the present invention, shall be covered by the protection scope of the present invention.

Claims

1. A multi-stage treatment device for waste oil processing wastewater, comprising a cylinder (1) and a flocculant delivery assembly, characterized in that: A center seat (8) is fixed on the inner wall of the bottom of the cylinder (1), and a second sector plate (11) is movably connected to the outer wall of the center seat (8), and a filter hole (12) is provided on the surface of the second sector plate (11), a float bag component is installed at the bottom of the second sector plate (11), and the float bag component is connected to the pneumatic component, a limiting groove (25) is provided on the side wall of the center seat (8), and a clamping head (29) is movably connected to the inner wall of the limiting groove (25), and a driving ring (28) is welded to the outer wall of the clamping head (29), and the bottom of the driving ring (28) is movably connected to the first sector plate (10).

2. The multi-stage treatment equipment for waste oil processing wastewater according to claim 1, characterized in that: The float bag component comprises a float bag body (13) and a support ring (14); a contact plate (31) is welded to the bottom of the second sector plate (11); the support ring (14) is fixed to the outer wall of the bottom of the contact plate (31) through a connecting column (30); and the float bag body (13) is bonded to the circumferential outer wall of the support ring (14).

3. The multi-stage treatment equipment for waste oil processing wastewater according to claim 2 is characterized in that: The flocculant delivery assembly comprises a storage seat (26) and a lifting plate (27), wherein the storage seat (26) is movably connected to the top outer wall of the lifting plate (27), and a feeding hole (32) is provided on the circumferential outer wall of the storage seat (26), and a filling pipe is installed on the top of the storage seat (26), and a strong magnet 1 is installed inside the lifting plate (27), and a strong magnet 2 is installed inside the second sector plate (11).

4. The multi-stage treatment equipment for waste oil processing wastewater according to claim 3 is characterized in that: The inner wall of the central seat (8) is fixed with a spiral column (23) via a bracket, and the circumferential inner wall of the storage seat (26) is movably connected with a second clamping head (36) used in conjunction with the spiral column (23).

5. The multi-stage treatment equipment for waste oil processing wastewater according to claim 4 is characterized in that: The outer circumferential wall of the cylinder (1) is movably connected to a slide rod (20), and a limit head (18) is welded to one end of the slide rod (20). A spring (19) is clamped between the inner wall of one side of the slide rod (20) and the outer circumferential wall of the cylinder (1).

6. The multi-stage treatment equipment for waste oil processing wastewater according to claim 5, characterized in that: The pneumatic assembly comprises a connecting plate (2) and a pneumatic box (3), wherein the connecting plate (2) is welded to the inner circumferential wall of the cylinder (1), and the pneumatic box (3) is welded to one end of the connecting plate (2), and an air pipe (21) is embedded in a through hole opened at the top of the pneumatic box (3), and the bottom of the air pipe (21) is connected to the top of the spiral column (23) through a solenoid valve (37), and a plurality of groups of air holes (38) are opened on the outer wall of the spiral column (23).

7. The multi-stage treatment equipment for waste oil processing wastewater according to claim 6, characterized in that: The outer wall of the air pipe (21) is connected to an electromagnetic valve (22) via a pipeline, and the electromagnetic valve (22) and the floating bag body (13) are connected via a bellows (9).

8. The multi-stage treatment equipment for waste oil processing wastewater according to claim 7, characterized in that: The top of the cylinder (1) is connected to a ball valve (5) via a flange, and a filter element (4) is fixed to one end of the ball valve (5) away from the cylinder (1). The bottom of the cylinder (1) is connected to a discharge pipe (6) via a flange, and a ball valve (7) is fixed to one end of the discharge pipe (6).

9. The multi-stage treatment equipment for waste oil processing wastewater according to claim 8, characterized in that: The bottom of the pneumatic box (3) is movably connected to a fan blade (33), and the bottom of the fan blade (33) is welded with a scraper (15) through a bent rod (24); the outer wall of the air pipe (21) is connected to a second solenoid valve (34) through a thread, and a nozzle (35) is fixed to one end of the second solenoid valve (34).

10. The multi-stage treatment equipment for waste oil processing wastewater according to claim 9, characterized in that: The top of the spiral column (23) is movably connected to a fixing ring (16), and the bottom of the fixing ring (16) is movably connected to an electromagnet (17).

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