A floating garbage salvaging device for sewage treatment

Abstract

The present invention relates to the technical field of devices for separating oily floating objects, and specifically discloses a floating garbage salvaging device for sewage treatment, including a separation tank and a waste discharge pipe, wherein the waste discharge pipe discharges the oily floating objects gathered in the separation tank, and the waste discharge pipe is located at one end of the inner side of the separation tank and is connected to two salvage devices for gathering the oily floating objects, and the two salvage devices both include a vertical middle frame and a buoy that slides up and down along the middle frame. The present invention uses the design of the buoy so that the buoy moves up and down to generate waves in the sewage, and the sewage and the oily floating objects in the upper layer of the separation tank are gathered together in the buoy during the sewage fluctuations. When the buoy moves up and down to salvage the mixture of sewage and oily floating objects, it drives the oil separator to reciprocately stretch, expand and squeeze and contract. The buoy moves downward to further absorb and enrich the oily floating objects in the salvaged mixture, and the buoy moves upward to concentrate the enriched oily floating objects in the oil collecting barrel for centralized discharge.

Description

Technical Field

[0001] The invention belongs to the technical field of devices for separating oily floating objects, and in particular relates to a floating garbage salvaging device for sewage treatment. Background Art

[0002] At domestic sewage treatment plants, domestic sewage will be collected and processed for solid cleaning, oil cleaning, and bacterial disinfection. After sewage treatment, it can be used as reclaimed water for factories, or it can be further purified and supplied to water plants as municipal water.

[0003] In the Chinese patent with publication number CN1 12661212B, it is mentioned that by providing a rotary cleaning mechanism, the rotary cleaning mechanism rotates to achieve the effect of uniformly stirring the sewage, so that the separation effect of water and floating garbage is better;

[0004] Solid floating objects can be pushed and salvaged through a rotating cleaning mechanism, but oily floating objects cannot be continuously lifted and scraped out by the rotating cleaning mechanism due to the fluidity and adhesion of the oil, and will adhere to the surface of the rotating cleaning mechanism and remain in the sewage pool, resulting in poor salvage efficiency for oily floating objects. Summary of the invention

[0005] The purpose of the present invention is to provide a floating garbage salvaging device for sewage treatment to solve the problems existing in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A floating garbage salvaging device for sewage treatment, comprising a separation tank and a waste discharge pipe, wherein the waste discharge pipe discharges oily floating objects gathered in the separation tank, and the waste discharge pipe is located inside the separation tank and one end thereof is connected to two salvage devices for gathering oily floating objects, wherein the two salvage devices each comprise a vertical middle frame and a buoy sliding up and down along the middle frame;

[0008] The middle frame includes a middle shaft, a guide ring is installed in the middle of the middle shaft, a blocking plate is installed at the lower end of the middle shaft, and the buoy includes a truncated cone-shaped cylinder body that is thick at the top and thin at the bottom, and the cylinder body opens upward. Two cylinder bodies move up and down to create waves and push the upper oily floating objects into the adjacent cylinder body;

[0009] An upper folding ring is installed inside the cylinder body, an oil separator is installed between the top surface of the upper folding ring and the bottom surface of the guide ring, an oil collecting cylinder is arranged at the lower end of the upper folding ring, and the oil collecting cylinder is connected to the waste discharge pipe. When the buoy goes down, sewage flows through the unfolded oil separator so that oily floating objects are adsorbed and captured, and when the buoy goes up, the oil separator is squeezed and contracted so that the oily floating objects are separated and drip into the oil collecting cylinder.

[0010] Preferably, the blocking plate blocks the top opening of the oil collecting cylinder when the buoy moves downward, and a water passage is formed between the bottom surface of the guide ring, the top surface of the blocking plate, the top surface of the upper folding ring and the inner wall of the cylinder.

[0011] Preferably, an opening is provided at the bottom of the cylinder, and a one-way flap is provided at the opening of the cylinder, and the end of the one-way flap can swing downward.

[0012] Preferably: a lower folding ring is provided between the oil collecting cylinder and the upper folding ring, and an inclined end surface cooperating with the lower folding ring is provided at the edge of the blocking plate.

[0013] Preferably, an inner folding edge is arranged at the top opening of the cylinder, the middle part of the inner folding edge extends downward, a through hole is arranged in the middle part of the inner folding edge, and the inner diameter of the through hole is smaller than the outer diameter of the guide ring.

[0014] Preferably, the bending bars are arranged in a ring array, and passing gaps are formed between adjacent bending bars.

[0015] Preferably: the oil separator comprises a bending strip, the bending strip is connected between the upper folding ring and the guide ring, the side wall of the bending strip is provided with a plurality of independent oil-attaching surfaces, and the oil-attaching surfaces are provided with convex strips along the radial direction of the upper folding ring.

[0016] Preferably, the upper folding ring is concave downward from the outer edge to the inner edge, and the guide ring is in the same inclination direction as the upper folding ring.

[0017] Preferably, an oil discharge port is provided at the bottom of the oil collecting cylinder, the oil discharge port penetrates the cylinder body and extends into the separation tank, and a flexible pipe is provided between the end of the oil discharge port and the waste discharge pipe.

[0018] Preferably, a lifting frame is installed on the top of the cylinder, a telescopic cylinder is installed between the lifting frame and the middle frame, a vertical guide rod is provided on the top of the lifting frame, and the vertical guide rod is slidably connected to the middle frame.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention adopts the design of the float, and the up and down movement of the float can generate waves in the sewage, and the sewage and oily floating objects in the upper layer of the separation tank are gathered together in the float during the sewage wave. When the float moves up and down to salvage the mixture of sewage and oily floating objects, it will drive the oil separator to stretch, expand, squeeze and shrink back and forth. The downward movement of the float can further absorb and enrich the oily floating objects in the salvaged mixture, and the upward movement of the float can concentrate the enriched oily floating objects into the oil collecting barrel for discharge, so as to carry out efficient salvage of the oily floating objects.

[0021] 2. The present invention provides a middle frame to vertically guide the up and down movement of the float to prevent deviation. The middle frame fixes the top of the oil separator through the upper folding ring, and the float drives the bottom of the oil separator to move up and down to complete the expansion and contraction of the oil separator. The middle frame provides a blocking plate at the opening of the oil collecting cylinder. When the oil collecting cylinder moves up and down with the float, a water passage is formed when the mixture enters to enrich the oily floating matter. After the sewage passes through, the oily floating matter is separately introduced into the oil collecting cylinder to achieve efficient salvage and separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of the present invention;

[0023] Figure 2 It is a schematic diagram of the positions of the buoy, the middle frame, the oil separator and the waste pipe of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure between the buoy and the waste discharge pipe of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the middle frame of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the oil separator of the present invention;

[0027] Figure 6 The position diagram of the buoy, the middle frame, the oil separator and the waste pipe of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 7 for Figure 6 The enlarged schematic diagram of point a in the middle;

[0029] Figure 8 The position diagram of the buoy, the middle frame, the oil separator and the waste pipe of the present invention is shown in FIG. Figure 2 ;

[0030] Fig. 9 for Figure 8 Enlarged schematic diagram of point b in the middle.

[0031] In the figure: 1, separation tank; 2, float; 21, cylinder; 22, inner fold edge; 23, upper fold ring; 24, lower fold ring; 25, oil collecting cylinder; 26, lifting frame; 27, oil discharge port; 28, one-way flap; 3, middle frame; 31, middle axis; 32, guide ring; 33, blocking plate; 34, inclined end surface; 4, waste discharge pipe; 5, oil separator; 51, bending strip; 52, oil surface; 53, convex strip; 6, water passage. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Reference Figure 1-Figure 9 As shown, the present invention provides a floating garbage salvaging device for sewage treatment, comprising a separation tank 1 and a waste discharge pipe 4;

[0034] Regarding the separation tank 1, for receiving sewage, see Figure 1 , water inlet pipes and drainage pipes are arranged on both sides of the separation tank 1. The water inlet pipe introduces sewage and oily floating objects into the separation tank 1. After introduction, the oily floating objects will float to the upper layer of the separation tank 1. The water inlet pipe and drainage pipe are inserted into the bottom surface of the separation tank 1. The lower layer is filled with water and the lower layer is drained, so as to avoid the water inlet and drainage disturbing the position of the upper layer oily floating objects;

[0035] Regarding the waste pipe 4, the end of the waste pipe 4 extends into the separation tank 1, refer to Figure 1 , the waste pipe 4 discharges the oily floating matter accumulated in the upper layer of the separation tank 1;

[0036] The core problem solved by this device is how to effectively salvage oily floating objects from sewage. For details, refer to Figure 1 , the waste pipe 4 is located at one end of the inner side of the separation tank 1 and is connected to two salvage devices for collecting oily floating objects. Both salvage devices include a vertical middle frame 3 and a buoy 2 that slides up and down along the middle frame 3. When in use, the buoy 2 moves up and down under the guidance of the middle frame 3. The buoy 2 includes a truncated cone-shaped cylinder 21 that is thick at the top and thin at the bottom. When the buoy 2 is inserted into the sewage while descending, the sewage will be pushed around to generate waves in the sewage. When the buoy 2 moves down to the lower dead point, the top is submerged a distance below the sewage liquid surface. The cylinder 21 opens upward, and cooperates with the waves generated by the synchronous descent of the adjacent cylinder 21, so that the upper oily floating objects are pushed into the buoy 2 from the top along with the sewage, and then the oily floating objects are discharged from the separation tank 1 through the waste pipe 4, completing the salvage and separation;

[0037] Regarding the middle frame 3, it is used to ensure the stable up and down movement of the buoy 2. Figure 1 and Figure 2The middle frame 3 includes a middle axis 31, and a lifting frame 26 is installed on the top of the cylinder 21, wherein a telescopic cylinder is installed between the lifting frame 26 and the middle frame 3, the telescopic cylinder is vertically fixed to the middle frame 3, and the bottom end of the telescopic cylinder is connected to the lifting frame 26, and the extension and contraction of the telescopic cylinder can drive the lifting frame 26 to slide up and down, and a vertical guide rod is provided on the top of the lifting frame 26, and a guide sleeve is installed on the side wall of the middle frame 3, and the guide sleeve and the vertical guide rod are slidably connected, and a sliding bearing is provided at the connection between the vertical guide rod and the guide sleeve, so as to realize the vertical guidance of the cylinder 21 by the middle frame 3;

[0038] Regarding the buoy 2, used for separating and salvaging oily floating objects, refer to Figure 1-Figure 4 When the buoy 2 collects the upper oily floating objects, it is inevitable that sewage will enter at the same time. If it is discharged directly, the amount of sewage in the discharged oily floating objects will be large. Therefore, a guide ring 32 is installed in the middle of the central axis 31. The guide ring 32 is horizontally arranged at the upper inner part of the cylinder 21. An upper folding ring 23 is installed on the inner side of the cylinder 21. The upper folding ring 23 is stacked below the guide ring 32. An oil separator 5 is installed between the top surface of the upper folding ring 23 and the bottom surface of the guide ring 32. The outer surface of the oil separator 5 is made of a hydrophobic and oleophilic flexible material. At the same time, an oil collecting cylinder 25 is arranged at the lower end of the upper folding ring 23, and a plugging plate 33 is installed at the lower end of the central axis 31 at the top opening of the oil collecting cylinder 25;

[0039] Specifically, when the cylinder 21 moves down below the liquid level, refer to Figure 1 and Figure 6 The oil collecting cylinder 25 moves downward synchronously with the cylinder body 21, and the plugging plate 33 blocks the top opening of the oil collecting cylinder 25 from bottom to top. At this time, the upper folding ring 23 moves downward away from the guide ring 32, so that the oil separator 5 is pulled and unfolded in the height direction. The oily floating matter and sewage mixture entering from the top of the cylinder body 21 will flow through the oil separator 5, and the oily floating matter will be adsorbed on the surface of the oil separator 5. The sewage will continue to flow over the edge of the upper folding ring 23, and then flow downward and gather at the lower inner part of the cylinder body 21; when the cylinder body 21 moves above the liquid level, refer to Figure 8 The oil collecting cylinder 25 moves upward and separates from the blocking plate 33, and the blocking plate 33 releases the top opening of the oil collecting cylinder 25. At this time, the oil separator 5 is squeezed by the upward upper folding ring 23 and pressed against the bottom surface of the guide ring 32. The oil separator 5 is deformed, and the oily floating matter on the surface will be squeezed down. The oil collecting cylinder 25 is located below the oil separator 5 and opens upward, and the oily floating matter drips downward into the oil collecting cylinder 25. The oil collecting cylinder 25 discharges the high-concentration oily floating matter enriched by the oil separator 5 from the waste pipe 4, thereby completing efficient salvage and separation of the oily floating matter.

[0040] In a further embodiment, when the buoy 2 moves downward to create waves, a channel is formed for the mixture of oil-like floating objects and sewage to flow smoothly through the oil separator 5 for separation. Figure 7, the cylinder 21 moves downward, and the plugging plate 33 seals the top opening of the oil collecting cylinder 25. The mixture entering from the upper part of the cylinder 21 will pass through the center of the guide ring 32, and then, blocked by the top surface of the plugging plate 33 and the top surface of the upper folding ring 23, it will flow horizontally. At this time, because the guide ring 32 is stationary and the upper folding ring 23 moves downward, the oil separator 5 will be pulled and expanded in the height direction to fully expose its outer surface and form a water passage 6, so that the mixture of oily floating matter and sewage can be horizontally dispersed through the position of the oil separator 5. The oil separator 5 absorbs the oily floating matter, and the sewage flows downward over the circumferential side wall of the upper folding ring 23 and enters the lower inner part of the cylinder 21 to complete the separation operation.

[0041] In a further embodiment, after the sewage enters the cylinder 21, it needs to be discharged in time to prevent the liquid level inside the cylinder 21 from exceeding the top opening of the cylinder 21, referring to Figure 1 , Figure 6 and Figure 8 The bottom of the cylinder 21 is provided with an opening, and the cylinder 21 is provided with a one-way flap 28 at the opening. The end of the one-way flap 28 can swing downward. When the cylinder 21 moves downward, the one-way flap 28 will impact the sewage below and will be subjected to an upward reverse thrust, thereby blocking the bottom of the cylinder 21, ensuring that the liquid level inside the cylinder 21 will be lower than the liquid level of the separation tank 1, so as to ensure that the upper oily floating matter and sewage mixture can smoothly enter the cylinder 21 from the upper part; when the cylinder 21 moves upward, the liquid level inside the cylinder 21 is higher than the liquid level of the separation tank 1, and the cylinder 21 Under the action of its own weight, the sewage inside will push the one-way flap 28 downward and open it. At this time, the bottom of the cylinder 21 is released until the liquid level inside the cylinder 21 is equal to the liquid level of the separation tank 1, and the sewage in the lower part of the inner side of the cylinder 21 is discharged. By controlling the upward distance of the cylinder 21, it can be ensured that the incoming oily floating matter and sewage mixture flows smoothly through the oil separator 5. The sewage flowing downward through the oil separator 5 is discharged from the bottom of the cylinder 21 into the separation tank 1, and the oily floating matter will be intercepted by the oil separator 5 for adsorption and enrichment.

[0042] In a further embodiment, when the oil separator 5 enriches and separates the oily floating matter and the sewage mixture, in order to prevent the mixture from directly entering the oil collecting cylinder 25 without separation, the structure is optimized, referring to Figure 1 , Figure 6 and Figure 7A lower folding ring 24 is provided between the oil collecting cylinder 25 and the upper folding ring 23. The lower folding ring 24 adopts a hollow frustum-shaped structure that is thin at the top and wide at the bottom. An inclined end surface 34 that cooperates with the lower folding ring 24 is provided at the edge of the blocking plate 33. When the cylinder body 21 and the oil collecting cylinder 25 descend synchronously, the side wall of the bottom end of the lower folding ring 24 fits with the inclined end surface 34 from top to bottom. Because the inclination angles of the lower folding ring 24 and the inclined end surface 34 are consistent, the contact area and the degree of fit are increased, thereby ensuring a stable seal. Because the inclined end surface 34 is inclined downward, when the cylinder body 21 ascends, the oily floating matter dripping from the top will scatter and flow into the oil collecting cylinder 25 under the guidance of the inclined end surface 34, thereby ensuring that the oily floating matter on the upper surface of the blocking plate 33 smoothly descends into the oil collecting cylinder 25, thereby avoiding accumulation above the blocking plate 33.

[0043] In a further embodiment, because the guide ring 32 is separated from the cylinder 21 and a gap is required for the cylinder 21 to move up and down, in order to prevent the oily floating matter and the sewage mixture from directly entering the cylinder 21 through the gap, the gap between the cylinder 21 and the guide ring 32 is optimized. Figure 1 and Figure 2 An inner folded edge 22 is provided at the top opening of the cylinder 21, and the top is made integrally with the top of the cylinder 21, and the middle part of the inner folded edge 22 extends downward, and a through hole is provided in the middle part of the inner folded edge 22, and the inner diameter of the through hole is smaller than the outer diameter of the guide ring 32. Through the extension design of the inner folded edge 22, the oily floating matter and the sewage mixture directly enter the middle part of the guide ring 32, and will not bypass the oil separator 5 and directly leak to the lower part of the cylinder 21, thereby improving the efficiency of salvaging the oily floating matter.

[0044] In a further embodiment, in order to further improve the efficiency of salvaging oily floating objects, the position and structure of the oil separator 5 are optimized. Figure 5 and Fig. 9 , the bending strips 51 are arranged in a circular array, so that when the cylinder 21 descends, the bending strips 51 are in an expanded state, and a passing gap is formed between adjacent bending strips 51 at this time, so that the oily floating matter and the sewage mixture can pass smoothly, and the side wall of the bending strip 51 is provided with a plurality of independent oil-attaching surfaces 52, and the plurality of bending strips 51 in the circular array make full use of the path through which the mixture passes, and enrich and adsorb the oily floating matter through a larger surface area, thereby further improving the collection effect of the oily floating matter; when the cylinder 21 descends, the bending strips 51 are in a compressed state, and the adjacent bending strips 51 squeeze each other at this time, so that the gaps in the height direction between the oil-attaching surfaces 52 disappear and they are pressed against each other, and the plurality of bending strips 51 in the circular array squeeze each other left and right, so as to ensure that the oil-attaching surfaces 52 are fully pressed against each other to squeeze the oily floating matter on the surface, and drip into the oil collecting cylinder 25 under the action of their own weight, so as to synchronously self-clean the oil separator 5, and realize the stable enrichment of the oily floating matter after long-term use;

[0045] Furthermore, the vertical side walls of the bending strips 51 of the oil separator 5 are bent back and forth to form a plurality of triangular through cavities. At the same time, a convex strip 53 is provided at the oil-attached surface 52 along the radial direction of the upper folding ring 23, so as to further increase the enrichment surface area of ​​the oil separator 5 in a space with limited height, thereby improving the oil collection effect. Moreover, the convex strip 53 is provided parallel to the flow direction of the mixture to fully contact the mixture and reduce obstruction and reversal of the mixture, thereby avoiding an abnormal increase in the sewage flow rate at the oil-attached surface 52 and ensuring that the oily floating objects gathered on the surface of the oil separator 5 will not be washed down by the sewage again.

[0046] In a further embodiment, in order to ensure that the oily floating matter is collected in the oil collecting barrel 25, refer to Figure 1 , Figure 8 and Fig. 9 The upper fold ring 23 is inclined downward and concave from the outer edge to the inner edge, and the guide ring 32 is inclined in the same direction as the upper fold ring 23. The end of the oil separator 5 close to the opening of the oil collecting barrel 25 can be set as the lowest point of the oil separator 5. When the oil separator 5 is squeezed, the oily floating matter on the surface of the oil separator 5 will flow smoothly to the opening of the oil collecting barrel 25 under the action of gravity, so that the oily floating matter can be stably dripped and collected into the oil collecting barrel 25. At the same time, the inclined setting of the guide ring 32 and the upper fold ring 23 can increase the radius length of the guide ring 32 and the upper fold ring 23, thereby increasing the size of the oil separator 5, and increasing the contact distance and time between the mixture and the oil separator 5, thereby further improving the efficiency of the oil separator 5 in absorbing the oily floating matter.

[0047] In a further embodiment, for reference Figure 1 and Figure 8 An oil discharge port 27 is provided at the bottom of the oil collecting barrel 25. The oily floating matter collected in the oil collecting barrel 25 will flow out of the oil collecting barrel 25 through the oil discharge port 27. The oil discharge port 27 penetrates the cylinder 21 and extends into the separation tank 1. Moreover, when the cylinder 21 moves upward, the oil collecting barrel 25 moves upward synchronously. At this time, the waste discharge pipe 4 does not move upward. Therefore, a flexible pipe is provided between the end of the oil discharge port 27 and the waste discharge pipe 4. The flexible pipe is deformed to compensate for the position offset to ensure that the cylinder 21 can move smoothly.

[0048] The working principle of the present invention is as follows:

[0049] Reference Figure 1 , the sewage with oily floating objects enters the separation tank 1, and the two buoys 2 move up and down synchronously under the guidance of the middle frame 3, so that the sewage in the separation tank 1 generates waves;

[0050] Reference Figure 6In the process of the float 2 moving from the top dead point to the bottom dead point, the cylinder 21 with a thick top and a narrow bottom pushes the sewage to the surroundings to generate waves. At this time, the upper folding ring 23 moves downward away from the guide ring 32 to unfold the oil separator 5. When the top surface of the cylinder 21 is lower than the liquid level of the separation tank 1, the oily floating matter and sewage mixture in the upper layer of the separation tank 1 enter the cylinder 21, and under the guidance of the blocking plate 33 and the upper folding ring 23, the oily floating matter is scattered and contacts the unfolded oil separator 5. The oily floating matter is adsorbed and enriched on the outer surface of the oil separator 5, and the sewage flows over the outer edge of the upper folding ring 23 and flows downward to gather at the lower inner part of the cylinder 21.

[0051] Reference Figure 8 During the movement of the float 2 from the lower dead point to the upper dead point, the cylinder 21 moves upward above the liquid level of the separation tank 1, and the sewage at the lower inner side of the cylinder 21 impacts the one-way flap 28 downward to flow back into the separation tank 1, and the cylinder 21 and the oil collecting cylinder 25 move upward synchronously, and the blocking plate 33 moves away from the top opening of the oil collecting cylinder 25. At the same time, the upper folding ring 23 will approach the guide ring 32 to squeeze and fit the flexible oil separator 5, and the oily floating matter enriched at the oil-attached surface 52 will be squeezed off the surface of the oil separator 5 and drip downward into the oil collecting cylinder 25. The oil collecting cylinder 25 will discharge the enriched high-concentration oily floating matter from the waste pipe 4, thereby completing the efficient salvage and separation of the oily floating matter.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A floating garbage salvaging device for sewage treatment, comprising a separation tank (1) and a waste discharge pipe (4), wherein the waste discharge pipe (4) discharges oily floating objects accumulated in the separation tank (1), characterized in that: The waste discharge pipe (4) is located inside the separation tank (1), and one end of the waste discharge pipe (4) is connected to two salvage devices for collecting oily floating objects. The two salvage devices each include a vertical middle frame (3) and a buoy (2) that slides up and down along the middle frame (3); The middle frame (3) comprises a middle shaft (31), a guide ring (32) is installed in the middle of the middle shaft (31), a blocking plate (33) is installed at the lower end of the middle shaft (31), and the buoy (2) comprises a truncated cone-shaped cylinder (21) which is thick at the top and thin at the bottom, the cylinder (21) is opened upward, and two cylinders (21) move up and down to create waves and push the upper oily floating objects into the adjacent cylinder (21); An upper folding ring (23) is installed inside the cylinder (21), an oil separator (5) is installed between the top surface of the upper folding ring (23) and the bottom surface of the guide ring (32), an oil collecting cylinder (25) is arranged at the lower end of the upper folding ring (23), and the oil collecting cylinder (25) is connected to the waste discharge pipe (4), and when the buoy (2) flows downward, sewage flows through the unfolded oil separator (5) so that oily floating objects are absorbed and captured, and when the buoy (2) moves upward, the oil separator (5) is squeezed and contracted so that the oily floating objects are separated and drip into the oil collecting cylinder (25); The blocking plate (33) blocks the top opening of the oil collecting cylinder (25) when the buoy (2) moves downward, and a water passage (6) is formed between the bottom surface of the guide ring (32), the top surface of the blocking plate (33), the top surface of the upper folding ring (23) and the inner wall of the cylinder (21); The middle frame (3) comprises a middle axis (31), a lifting frame (26) is installed on the top of the cylinder (21), a telescopic cylinder is installed between the lifting frame (26) and the middle frame (3), the telescopic cylinder is vertically fixed to the middle frame (3), the bottom end of the telescopic cylinder is connected to the lifting frame (26), the telescopic cylinder can drive the lifting frame (26) to slide up and down, a vertical guide rod is arranged on the top of the lifting frame (26), a guide sleeve is installed on the side wall of the middle frame (3), the guide sleeve and the vertical guide rod are slidably connected, and a sliding bearing is arranged at the connection between the vertical guide rod and the guide sleeve, so as to realize the vertical guidance of the cylinder (21) by the middle frame (3).

2. A floating garbage salvaging device for sewage treatment according to claim 1, characterized in that: The bottom of the cylinder (21) is provided with an opening, and the cylinder (21) is provided with a one-way flap (28) at the opening, and the end of the one-way flap (28) can swing downward.

3. The floating garbage salvaging device for sewage treatment according to claim 1 is characterized in that: A lower folding ring (24) is provided between the oil collecting cylinder (25) and the upper folding ring (23), and an inclined end surface (34) matching with the lower folding ring (24) is provided at the edge of the blocking plate (33).

4. The floating garbage salvaging device for sewage treatment according to claim 1 is characterized in that: An inner folding edge (22) is arranged at the top opening of the cylinder (21), the middle part of the inner folding edge (22) extends downward, a through hole is arranged in the middle part of the inner folding edge (22), and the inner diameter of the through hole is smaller than the outer diameter of the guide ring (32).

5. The floating garbage salvaging device for sewage treatment according to claim 1 is characterized in that: The oil separator (5) comprises bending bars (51), the bending bars (51) are arranged in a ring array, and passing gaps are formed between adjacent bending bars (51).

6. A floating garbage salvaging device for sewage treatment according to claim 5, characterized in that: The bending strip (51) is connected between the upper folding ring (23) and the guide ring (32), and a plurality of independent oil-attaching surfaces (52) are provided on the side wall of the bending strip (51). The oil-attaching surfaces (52) are provided with convex strips (53) along the radial direction of the upper folding ring (23).

7. The floating garbage salvaging device for sewage treatment according to claim 1 is characterized by: The upper folding ring (23) is arranged to be concave downward from the outer edge to the inner edge, and the guide ring (32) has the same inclination direction as the upper folding ring (23).

8. The floating garbage salvaging device for sewage treatment according to claim 1, characterized in that: An oil discharge port (27) is provided at the bottom of the oil collecting cylinder (25). The oil discharge port (27) penetrates the cylinder body (21) and extends into the separation tank (1). A flexible pipe is provided between the end of the oil discharge port (27) and the waste discharge pipe (4).

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