Floating oil removal device for sewage treatment tank

Abstract

The invention discloses a floating oil removal device for a sewage treatment tank. The floating oil removal device comprises a horizontal moving mechanism, a support structure, a buoyancy shell, a sinking driver and a main controller, the horizontal moving mechanism is mounted on the upper side of the sewage treatment tank, and the support structure is arranged on a moving part of the horizontal moving mechanism; the buoyancy shell and the sinking driver are installed on the support structure, and the sinking driver is in transmission connection with the buoyancy shell. The buoyancy shell is internally provided with an oil collecting cavity, the upper part is provided with an oil inlet and a flow guide wall, and the lower part is provided with an oil outlet and is connected with an oil discharge pipeline; the flow guide wall surrounds the oil inlet and sinks downwards from outside to inside, the upper surface of the flow guide wall is an oleophylic and hydrophobic surface, and a sensing element is further arranged on the upper portion of the buoyancy shell and used for detecting the medium environment where the flow guide wall is immersed; the main controller is electrically connected with the sensing element and the sinking driver, and when it is detected that the medium environment is oil or air, the sinking driver is started to drive the buoyancy shell to sink; otherwise, the device automatically floats upwards.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a floating oil removal device used in a sewage treatment pool. Background Art

[0002] In the operation and treatment of sewage treatment plants, whether it is domestic sewage or industrial wastewater, it usually contains oily impurities such as vegetable oil, fat, mineral oil, etc., which float on the surface of the sewage to form floating oil. It is difficult to effectively remove the floating oil through filtration, sedimentation, electrolysis and other processes, which seriously affects the purification effect of sewage treatment.

[0003] For example, a Chinese invention patent application with application publication number CN114212853A and application publication date 2022.03.22 discloses a flotation tank for demulsifying wastewater containing emulsified oil, a wastewater treatment system including the same, and a method, wherein the flotation tank comprises: a main tank body and an oil scraping magnetic absorption component, the main tank body comprises a bubble contact chamber and a separation chamber; the oil scraping magnetic absorption component is arranged at the upper part of the separation chamber, specifically comprising a fixed bracket fixed to the tank wall of the separation chamber, a support frame movably connected to the fixed bracket and capable of horizontal movement, a power device providing power for the horizontal movement of the support frame, an oil scraping plate, an oil absorbing carbon sponge, and an electromagnet. The oil scraping plate is fixed to the support frame by a first fixed rod; the oil absorbing carbon sponge is fixedly arranged at the rear of the oil scraping plate by a second fixed rod and at a certain distance from the oil scraping plate; the electromagnet is connected to the support frame by a movable lifting device; the movable lifting device is configured to enable the electromagnet to rise and fall between the floating bubble layer and the inside of the bubble liquid in the separation chamber.

[0004] The flotation tank used for demulsification of wastewater containing emulsified oil in the prior art is provided with an oil removal and demagnetization component, using an oil scraper to scrape the oil phase, an oil absorbing carbon sponge to absorb the oil phase, and an electromagnet to adsorb the magnetic demulsifier. However, in the actual water treatment process, the oil scraper will scrape up floating oil and gradually accumulate it, and the floating oil is easy to scatter on the rear side of the oil scraper. Even if it is scraped multiple times, it is still difficult to completely remove the floating oil on the water surface. In addition, the oil absorbing carbon sponge has a small oil absorption capacity, low efficiency and poor sustainability in removing floating oil, and is not suitable for the treatment of large amounts of floating oil in sewage treatment plants. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a floating oil removal device for a sewage treatment pool, which solves the problem that the existing scraper blade scrapes up the floating oil and gradually accumulates it, and the floating oil is easily scattered on the rear side of the scraper blade. Even if it is scraped multiple times, it is still difficult to completely remove the floating oil on the water surface. In addition, the oil absorption capacity of the oil-absorbing carbon sponge is small, and the efficiency and sustainability of floating oil removal are low, so it is not suitable for the treatment conditions of a large amount of floating oil in sewage in a sewage treatment plant.

[0006] The present invention provides the following technical solutions: The floating oil removal device for a sewage treatment tank comprises a horizontal moving mechanism, a support structure, a buoyancy shell and a sinking drive, wherein the horizontal moving mechanism is used to be installed on the upper side of the sewage treatment tank, the horizontal moving mechanism has a moving part that can move translationally in a horizontal plane, and the support structure is arranged on the moving part; The buoyancy shell and the sinking drive are respectively installed on the support structure, and the sinking drive is connected to the buoyancy shell in a transmission manner; an oil collecting chamber is provided inside the buoyancy shell, an oil inlet and a guide wall are provided at the upper part of the buoyancy shell, the oil inlet is connected to the oil collecting chamber, and an oil outlet is provided at the lower part of the buoyancy shell, and the oil outlet is connected to an oil discharge pipeline; The guide wall is arranged around the oil inlet and is concave downward from the outside to the inside. The upper surface of the guide wall is an oleophilic and hydrophobic surface. A sensing element is also provided on the upper part of the buoyancy shell. The sensing element is used to detect the medium environment in which the guide wall is immersed. It also includes a main controller, which is electrically connected to the sensing element and the sinking driver respectively, and is used to receive a medium signal detected by the sensing element, and control the sinking driver to start or shut down according to the medium signal; When the sensing element detects that the medium environment is oil or air, the main controller controls the sinking drive to start to drive the buoyancy shell to sink; when the sensing element detects that the medium environment is water, the main controller controls the sinking drive to close to release the buoyancy shell to automatically float.

[0007] Preferably, the buoyancy shell is a shell structure of any one of a spherical, ellipsoidal, cylindrical, and conical shape, the contour shape of the guide wall is an annular protrusion, the sensing element is arranged on the inner side of the guide wall, and the sensing surface of the sensing element is flush with the upper end surface of the guide wall.

[0008] Preferably, the sensing element comprises a sensing circuit and two conductive contacts, the sensing circuit is sealed and arranged inside the buoyancy shell, the two sensing elements are symmetrically arranged about the oil inlet, and the sensing circuit is electrically connected to the two conductive contacts respectively; When the two conductive contacts are in an electrically disconnected state, the induction circuit sends a medium signal of oil or air to the main controller; when the two conductive contacts are in an electrically connected state, the induction circuit sends a medium signal of water to the main controller.

[0009] Preferably, the support structure is an L-shaped support structure, which includes a vertical section and a horizontal section that are fixedly connected, the vertical section is fixedly mounted on the moving part, the horizontal section is located at the lower end of the vertical section, the horizontal section is provided with a guide sleeve, the lower end of the buoyancy shell is fixedly connected with a positioning rod, the positioning rod is slidably inserted in the guide sleeve, and the sinking drive is transmission-connected to the positioning rod.

[0010] Preferably, the sinking driver is an electromagnetic repulsion mechanism, which includes a power supply, an electromagnetic coil and a matching piece, the electromagnetic coil is insulated and installed on the lower side of the horizontal section, the lower end of the positioning rod is penetrated and arranged on the lower side of the horizontal section, the matching piece is installed on the lower end of the positioning rod, and the electromagnetic coil and the matching piece are arranged at intervals up and down; The power supply is electrically connected to the electromagnetic coil. When started, the electromagnetic coil generates a magnetic field and forms a repulsive force on the matching piece to drive the positioning rod and the buoyancy shell to sink. When turned off, the repulsive force between the electromagnetic coil and the matching piece disappears, allowing the positioning rod and the buoyancy shell to automatically float up.

[0011] Preferably, the power supply is a DC power supply, the matching part is a permanent magnet, the side of the electromagnetic coil facing the permanent magnet is a first magnetic pole, the side of the permanent magnet facing the electromagnetic coil is a second magnetic pole, and the first magnetic pole is the same as the second magnetic pole.

[0012] Preferably, the power supply is an AC power supply, and the matching part is an induction coil or a conductive disk. When started, the electromagnetic coil generates an alternating magnetic field, and the matching part generates an induced current in the alternating magnetic field and forms a coupled magnetic field, and the coupled magnetic field is opposite to the alternating magnetic field with the same pole.

[0013] Preferably, the guide wall is made of a hydrophobic and oleophilic material in one piece, and the hydrophobic and oleophilic material is any one of polyethylene, polypropylene, polytetrafluoroethylene, fluororubber, butyl rubber, and hard silica gel, and the upper surface of the hydrophobic and oleophilic material forms the hydrophobic and oleophilic surface; Alternatively, the guide wall is provided with any one of polyvinyl chloride coating, polyurethane coating, nano silicon oxide coating, nano siloxane coating and silicone wax coating, and the surface of any one of polyvinyl chloride coating, polyurethane coating, nano silicon oxide coating, nano siloxane coating and silicone wax coating forms the hydrophobic and oleophilic surface.

[0014] Preferably, a self-priming oil pump is installed on the support structure, and the self-priming oil pump is connected to a position of the oil discharge pipeline away from the oil outlet, and a buffer section is also provided on the oil discharge pipeline between the self-priming oil pump and the oil outlet.

[0015] Preferably, the horizontal movement mechanism comprises a main crossbeam, two guide rails, a walking wheel set and a slide seat, the two guide rails are arranged in parallel on the upper side of the sewage treatment tank, and the main crossbeam is erected between the two guide rails; The traveling wheel set is rotatably mounted on both ends of the main beam, and the traveling wheel set is rollingly matched with the guide rail; the slide seat is movably mounted on the main beam, and the slide seat constitutes the moving part that can translate in a horizontal plane.

[0016] Compared with the prior art, the present invention provides a floating oil removal device for a sewage treatment pool, which has the following beneficial effects: The floating oil removal device for the sewage treatment tank adopts a design form of a horizontal moving mechanism, a bracket structure, a buoyancy shell and a sinking drive. The horizontal moving mechanism is installed on the upper side of the sewage treatment tank, the bracket structure is arranged on the moving part of the horizontal moving mechanism, and the buoyancy shell and the sinking drive are respectively installed on the bracket structure. The horizontal moving mechanism is used as the moving mechanism of the floating oil removal device. The horizontal moving structure and its moving part can drive the buoyancy shell to move in a horizontal plane, so that the buoyancy shell can perform a wide-area floating oil removal operation in the sewage treatment tank. The sinking drive is connected to the buoyancy shell in a transmission manner, and the buoyancy shell can be driven to immerse in water through the sinking drive, ensuring that the floating oil layer on the water surface can be collected into the buoyancy shell by gravity.

[0017] The buoyancy shell has an oil collecting chamber inside, an oil inlet and a guide wall at the top of the buoyancy shell, an oil outlet at the bottom of the buoyancy shell, the oil inlet and the oil outlet are both connected to the oil collecting chamber, the oil outlet is connected to an oil discharge pipeline, and the guide wall is arranged around the oil inlet and is concave downward from the outside to the inside. During the floating oil removal process, the guide wall of the buoyancy shell contacts the upper medium in the sewage treatment pool, and the guide wall concave downward from the outside to the inside allows the upper medium to flow smoothly into the oil inlet, and increases the kinetic energy of the floating oil layer flowing into the oil inlet.

[0018] The upper surface of the guide wall is an oleophilic and hydrophobic surface. When it contacts the floating oil, the contact angle between the floating oil and the upper surface of the guide wall is less than 90°, which is oleophilic, and the oil molecules can spread and move smoothly on the surface; conversely, when it contacts water, the contact angle between the water and the upper surface of the guide wall is greater than 90°, which is hydrophobic, and the water molecules are difficult to spread and move on its surface, which is equivalent to achieving the effect of accelerating the inflow of floating oil and repelling water at the same time. In addition, a sensing element is also provided on the upper part of the buoyancy shell, and the sensing element is used to detect the medium environment in which the guide wall is immersed.

[0019] More importantly, the main controller is electrically connected to the sensing element and the sinking driver respectively. The main controller is used to receive the medium signal detected by the sensing element and control the sinking driver to start or shut down according to the medium signal. When working, the sensing element detects the medium environment immersed in the guide wall in real time and sends the detected medium signal to the main controller. When the medium environment is detected to be oil or air, the main controller controls the sinking driver to start to drive the buoyancy shell to sink, so that the buoyancy shell continues to sink to allow more floating oil to flow into the oil collecting chamber.

[0020] When it sinks until the medium environment is detected to be water, the main controller controls the sinking drive to close to release the buoyancy shell to automatically float up, avoiding the buoyancy shell from flowing into the water body due to the large sinking depth. Then, when the buoyancy shell floats up to the sensing element detecting that the medium environment is oil or air, the sinking drive is controlled again to start and sink the buoyancy shell. That is, the buoyancy shell undergoes dynamic floating and sinking movement near the water-oil interface, so that the floating oil layer can actively and quickly flow into the oil collecting chamber, and under the influence of the hydrophobicity of the upper surface of the guide wall and the water surface tension, the water layer is repelled to reduce the possibility of flowing into the oil collecting chamber. Compared with the existing scraper degreasing method, the floating oil removal device achieves the effect of completely removing floating oil on the water surface, and the efficiency and sustainability of floating oil removal are better, and it is more suitable for the treatment of large amounts of floating oil in sewage treatment plants.

[0021] In addition, the buoyancy shell is designed to be spherical, taking into account the large volume of the oil collecting chamber and the streamlined appearance, reducing the problem of large fluctuations in the water surface of the sewage treatment pool caused by underwater movement, thereby ensuring the stability of the water-oil stratification. In addition, the sensing surface of the sensing element is flush with the upper end surface of the guide wall, which can improve the accuracy of detecting the medium environment immersed in the guide wall and ensure that the medium changes between water and oil or air can be accurately and sensitively sensed. It should be noted that since sewage contains more electrolyte components and has a significant difference in conductivity compared to oil or air, the two conductive contacts of the sensing element can accurately sense changes in the medium environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of a floating oil removal device for a sewage treatment tank in a specific embodiment of the present invention; Figure 2 It is a cross-sectional schematic diagram of a floating oil removal device for a sewage treatment tank in a specific embodiment of the present invention; Figure 3 It is a three-dimensional schematic diagram of a buoyancy shell in a specific embodiment of the floating oil removal device for a sewage treatment tank of the present invention; Figure 4 It is a cross-sectional schematic diagram of a buoyancy shell in a sinking state in a specific embodiment of the floating oil removal device for a sewage treatment tank of the present invention; Figure 5 It is a cross-sectional schematic diagram of a buoyancy shell in a floating state in a specific embodiment of the floating oil removal device for a sewage treatment tank of the present invention; Figure 6 for Figure 5 A partial cross-sectional diagram of the medium buoyancy shell at the guide wall; In the figure: 1-horizontal moving mechanism, 10-moving part, 11-main beam, 12-guide rail, 13-walking wheel group, 2-support structure, 20-positioning rod, 21-vertical section, 22-horizontal section, 23-guide sleeve, 3-buoyancy shell, 30-oil collecting chamber, 31-oil inlet, 32-guide wall, 33-oil outlet, 34-oil discharge pipeline, 35-buffer section, 4-sinking drive, 41-electromagnetic coil, 42-matching part, 5-sensing element, 50-main controller, 51-conductive contact, 52-sensing circuit, 6-floating oil layer, 7-water layer. DETAILED DESCRIPTION

[0023] 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.

[0024] A specific embodiment of the floating oil removal device for a sewage treatment tank of the present invention is as follows: Figures 1 to 6 As shown, the floating oil removal device for a sewage treatment tank includes a horizontal moving mechanism 1, a support structure 2, a buoyancy shell 3 and a sinking drive 4. The horizontal moving mechanism 1 is used to be installed on the upper side of the sewage treatment tank. The horizontal moving mechanism 1 has a moving part 10 that can move translationally in a horizontal plane. The support structure 2 is arranged on the moving part 10; the buoyancy shell 3 and the sinking drive 4 are respectively installed on the support structure 2, and the sinking drive 4 is transmission-connected to the buoyancy shell 3.

[0025] An oil collecting chamber 30 is provided inside the buoyancy shell 3, and an oil inlet 31 and a guide wall 32 are provided on the upper part of the buoyancy shell 3. The oil inlet 31 is connected to the oil collecting chamber 30, and an oil outlet 33 is opened at the lower part of the buoyancy shell 3, and the oil outlet 33 is connected to the oil drain pipeline 34; the guide wall 32 is arranged around the oil inlet 31 and is recessed downward from the outside to the inside, and the upper surface of the guide wall 32 is an oil-philic and hydrophobic surface. A sensing element 5 is also provided on the upper part of the buoyancy shell 3, and the sensing element 5 is used to detect the medium environment in which the guide wall 32 is immersed.

[0026] The floating oil removal device also includes a main controller 50, which is electrically connected to the sensing element 5 and the sinking drive 4, respectively. The main controller 50 is used to receive the medium signal detected by the sensing element 5, and control the sinking drive 4 to start or shut down according to the medium signal; when the sensing element 5 detects that the medium environment is oil or air, the main controller 50 controls the sinking drive 4 to start to drive the buoyancy shell 3 to sink; when the medium environment detected by the sensing element 5 is water, the main controller 50 controls the sinking drive 4 to shut down to release the buoyancy shell 3 to automatically float.

[0027] The floating oil removal device for the sewage treatment tank adopts the design form of a horizontal moving mechanism 1, a support structure 2, a buoyancy shell 3 and a sinking drive 4. The horizontal moving mechanism 1 is installed on the upper side of the sewage treatment tank, the support structure 2 is arranged on the moving part 10 of the horizontal moving mechanism 1, and the buoyancy shell 3 and the sinking drive 4 are respectively installed on the support structure 2. The horizontal moving mechanism 1 is used as the moving mechanism of the floating oil removal device. The horizontal moving structure 1 and its moving part 10 can drive the buoyancy shell 3 to move in a horizontal plane, so that the buoyancy shell 3 can perform a wide-area floating oil removal operation in the sewage treatment tank. The sinking drive 4 is connected to the buoyancy shell 3 in a transmission manner, and the buoyancy shell 3 can be driven to immerse in water through the sinking drive 4, ensuring that the floating oil layer 6 on the water surface can be collected into the buoyancy shell 3 by gravity.

[0028] The buoyancy shell 3 has an oil collecting chamber 30 disposed inside, an oil inlet 31 and a guide wall 32 disposed on the upper portion of the buoyancy shell 3, the oil inlet 31 being connected to the oil collecting chamber 30, an oil outlet 33 disposed on the lower portion of the buoyancy shell 3, the oil outlet 33 being connected to an oil discharge pipeline 34, and the guide wall 32 being arranged around the oil inlet 31 and being concave downward from the outside to the inside. During the process of removing the floating oil, the guide wall 32 of the buoyancy shell 3 contacts the upper medium in the sewage treatment tank, and the guide wall 32 concave downward from the outside to the inside allows the upper medium to flow smoothly into the oil inlet 31, and increases the kinetic energy of the floating oil layer 6 flowing into the oil inlet 31.

[0029] The upper surface of the guide wall 32 is an oleophilic and hydrophobic surface. When it contacts the floating oil, the contact angle between the floating oil and the upper surface of the guide wall 32 is less than 90°, which is oleophilic, and the oil molecules can spread and move smoothly on the surface; on the contrary, when it contacts water, the contact angle between the water and the upper surface of the guide wall 32 is greater than 90°, which is hydrophobic, and the water molecules are difficult to spread and move on its surface, which is equivalent to achieving the effect of accelerating the inflow of floating oil and repelling water at the same time. In addition, a sensing element 5 is also provided on the upper part of the buoyancy shell 3, and the sensing element 5 is used to detect the medium environment in which the guide wall 32 is immersed.

[0030] More importantly, the main controller 50 is electrically connected to the sensing element 5 and the sinking driver 4, respectively. The main controller 50 is used to receive the medium signal detected by the sensing element 5, and control the sinking driver 4 to start or shut down according to the medium signal. When working, the sensing element 5 detects the medium environment immersed in the guide wall 32 in real time, and sends the detected medium signal to the main controller 50. When the medium environment is detected to be oil or air, the main controller 50 controls the sinking driver 4 to start to drive the buoyancy shell 3 to sink, so that the buoyancy shell 3 continues to sink so that more floating oil can flow into the oil collecting chamber 30.

[0031] When the buoyancy shell 3 sinks until the medium environment is detected to be water, the main controller 50 controls the sinking drive 4 to close to release the buoyancy shell 3 to automatically float up, so as to avoid the buoyancy shell 3 from flowing into the water body due to the large sinking depth. Then, when the buoyancy shell 3 floats up until the sensing element 5 detects that the medium environment is oil or air, the sinking drive 4 is controlled again to start and sink the buoyancy shell 3. That is, the buoyancy shell 3 dynamically floats and sinks near the water-oil interface, so that the floating oil layer 6 can actively and quickly flow into the oil collecting chamber 30, and under the influence of the hydrophobicity of the upper surface of the guide wall 32 and the water surface tension, the water layer 7 is repelled to reduce the possibility of flowing into the oil collecting chamber 30. Compared with the existing scraper degreasing method, the floating oil removal device achieves the effect of completely removing floating oil on the water surface, and the efficiency and sustainability of floating oil removal are better, and it is more suitable for the treatment of a large amount of floating oil in sewage treatment plants.

[0032] In this embodiment, the buoyancy shell 3 is spherical, the contour of the guide wall 32 is an annular protrusion, the sensing element 5 is arranged on the inner side of the guide wall 32, and the sensing surface of the sensing element 5 is flush with the upper end surface of the guide wall 32. The buoyancy shell 3 is designed to be spherical, taking into account the large volume and streamlined appearance of the oil collecting chamber 30, reducing the problem of large fluctuations in the water surface of the sewage treatment pool caused by underwater movement, thereby ensuring the stability of water-oil stratification. In addition, the sensing surface of the sensing element 5 is flush with the upper end surface of the guide wall 32, which can improve the accuracy of detecting the medium environment immersed in the guide wall 32, and ensure that the medium changes of water, oil or air can be accurately and sensitively sensed.

[0033] In order to meet different usage requirements, in other embodiments, the buoyancy shell can be designed as a shell structure in any shape of ellipsoid, cylinder, or cone. For example, the buoyancy shell is a cylindrical shell structure, the central axis of the buoyancy shell is arranged in the vertical direction, the oil inlet is opened at the upper center of the buoyancy shell, and the guide wall is an annular protrusion arranged around the oil inlet, which can also allow the floating oil layer to flow smoothly into the buoyancy shell.

[0034] Specifically, the sensing element 5 includes a sensing circuit 52 and two conductive contacts 51. The sensing circuit 52 is sealed inside the buoyancy shell 3. The two sensing elements 5 are symmetrically arranged about the oil inlet 31, and the sensing circuit 52 is electrically connected to the two conductive contacts 51, respectively. When the two conductive contacts 51 are in an electrically disconnected state, the sensing circuit 52 sends a medium signal of oil or air to the main controller 50. When the two conductive contacts 51 are in an electrically connected state, the sensing circuit 52 sends a medium signal of water to the main controller 50.

[0035] The sensing circuit 52 is a flexible sheet circuit that can be fixedly attached to the upper inner wall of the buoyancy shell 3, and its exterior is coated with a packaging film to prevent damage by water erosion. The sensing circuit 52 includes a built-in power supply, a signal processor, and a resistor. The built-in power supply, the signal processor, and the resistor are electrically connected to form a loop, and the two conductive contacts 51 are arranged in parallel with the resistor. When the two conductive contacts 51 are immersed in oil or air at the same time, the sensing circuit 52 detects that the two conductive contacts 51 are electrically disconnected, and sends a medium signal of oil or air to the main controller 50; similarly, when the two conductive contacts 51 are immersed in water at the same time, the sensing circuit 52 detects that the two conductive contacts 51 are electrically connected, and sends a medium signal of water to the main controller 50.

[0036] It should be noted that, since sewage contains more electrolyte components, there is a significant difference in conductivity compared to oil or air, so the two conductive contacts 51 of the sensing element 5 can accurately sense the change of the medium environment. In order to meet different usage requirements, the sensing element is not limited to the method of detecting the conductivity of the medium. In other embodiments, an optical sensor or a density sensor is also used to detect the medium environment immersed in the guide wall in real time, and the buoyancy shell can also be controlled to float and sink, so as to effectively remove the floating oil.

[0037] As a further preferred solution, the support structure 2 is an L-shaped support structure, and the support structure 2 includes a vertical section 21 and a horizontal section 22 that are fixedly connected. The vertical section 21 is fixedly mounted on the moving part 10, and the horizontal section 22 is located at the lower end of the vertical section 21. The horizontal section 22 is provided with a guide sleeve 23. The lower end of the buoyancy shell 3 is fixedly connected with a positioning rod 20, and the positioning rod 20 is slidably inserted in the guide sleeve 23, and the sinking drive 4 is transmission-connected with the positioning rod 20. The L-shaped support structure provides a hanging installation portion for the buoyancy shell 3, so that the buoyancy shell 3 can be completely immersed in the sewage treatment pool. Through the sliding cooperation between the positioning rod 20 and the guide sleeve 23, the accuracy of the up and down floating and sinking movement of the buoyancy shell 3 is improved, and it is ensured that the oil inlet 31 of the buoyancy shell 3 is always facing upward for the floating oil to flow in smoothly.

[0038] In this embodiment, the sinking driver 4 is an electromagnetic repulsion mechanism, which includes a power supply, an electromagnetic coil 41 and a matching piece 42. The electromagnetic coil 41 is insulated and installed on the lower side of the horizontal section 22. The lower end of the positioning rod 20 is penetrated and arranged on the lower side of the horizontal section 22. The matching piece 42 is installed on the lower end of the positioning rod 20. The electromagnetic coil 41 and the matching piece 42 are arranged at intervals up and down. The power supply is electrically connected to the electromagnetic coil 41. When started, the electromagnetic coil 41 generates a magnetic field and forms a repulsive force on the matching piece 42 to drive the positioning rod 20 and the buoyancy shell 3 to sink. When turned off, the repulsive force between the electromagnetic coil 41 and the matching piece 42 disappears, so that the positioning rod 20 and the buoyancy shell 3 can automatically float. Among them, the power supply is a DC power supply, the matching piece 42 is a permanent magnet, the side of the electromagnetic coil 41 facing the permanent magnet is the first magnetic pole, and the side of the permanent magnet facing the electromagnetic coil 41 is the second magnetic pole, and the first magnetic pole is the same as the second magnetic pole.

[0039] During operation, the main controller 50 performs motion control according to the medium signal sent by the sensing element 5. If sinking is required, Figure 4 As shown, the main controller 50 controls the electromagnetic coil 41 to be energized, and a constant magnetic field is generated around it. The first magnetic pole of the constant magnetic field is the same as the second magnetic pole of the magnetic field of the matching piece 42, that is, the same poles are arranged opposite to each other, and a magnetic field repulsion force is instantly generated to drive the matching piece 42, the positioning rod 20 and the buoyancy shell 3 to move downward, and at this time they are in a sinking state. If you need to float up, Figure 5 As shown, the main controller 50 controls the electromagnetic coil 41 to be powered off, and the magnetic field around it disappears. The buoyancy shell 3 overcomes gravity and floats upward under the action of its own buoyancy, and is now in a floating state. The electromagnetic repulsion mechanism has the advantages of high response speed, low latency, rapid disappearance of repulsion, and not easily affected by the medium environment, which meets the requirements of intermittently and instantaneously driving the buoyancy shell 3 to sink, thereby ensuring that the buoyancy shell 3 can dynamically float and sink near the water-oil interface.

[0040] In order to meet different usage requirements, the sinking drive is not limited to the structural design in the above-mentioned embodiment. In other embodiments, the power supply can be selected as an AC power supply. Correspondingly, the matching part is an induction coil or a conductive disk. When the electromagnetic coil generates an alternating magnetic field at startup, the matching part generates an induced current in the alternating magnetic field and forms a coupled magnetic field. The coupled magnetic field is opposite to the alternating magnetic field with the same polarity. The electromagnetic opening and closing mechanism of the circuit breaker can be referred to. When started, alternating current is passed through the electromagnetic coil, and an alternating magnetic field is generated around the electromagnetic coil. According to the eddy current principle, the matching part induces eddy currents in the opposite direction to the current direction of the electromagnetic coil, that is, inducing current and forming a coupled magnetic field. The coupled magnetic field is opposite to the alternating magnetic field with the same polarity, which can also achieve the effect of repulsive drive.

[0041] It should be noted that the guide wall 32 is made of a hydrophobic and oleophilic material in one piece, the hydrophobic and oleophilic material is polyethylene, and the upper surface of the hydrophobic and oleophilic material forms a hydrophobic and oleophilic surface. Figure 6 As shown, the working principle of the hydrophobic and oleophilic surface is: the contact angle α between water and the upper surface of the guide wall 32 is greater than 90°, that is, the water is in the form of large water drops and is difficult to spread and flow along the guide wall 32. On the contrary, the contact angle between the floating oil and the upper surface of the guide wall 32 is less than 90°, and it can spread and flow rapidly along the guide wall 32. In addition, with the support of the hydrophobic and oleophilic surface, the buoyancy shell 3 mainly reduces the possibility of the water layer 7 flowing into it, and also allows a small amount of water to flow into the buoyancy shell 3, which does not affect the efficiency of removing the floating oil.

[0042] In order to meet different usage requirements, the hydrophobic and oleophilic materials can also be selected from any one of polyethylene, polypropylene, polytetrafluoroethylene, fluororubber, butyl rubber, and hard silica gel, and the upper surfaces of these hydrophobic and oleophilic materials can also form a hydrophobic and oleophilic surface. Alternatively, the guide wall is provided with any one of polyvinyl chloride coating, polyurethane coating, nano silicon oxide coating, nano siloxane coating, and silicone wax coating, and the surface of any one of polyvinyl chloride coating, polyurethane coating, nano silicon oxide coating, nano siloxane coating, and silicone wax coating forms a hydrophobic and oleophilic surface.

[0043] Among them, a self-priming oil pump is installed on the support structure 2, and the self-priming oil pump is connected to the position of the oil discharge pipeline 34 away from the oil outlet 33. The oil discharge pipeline 34 is also provided with a buffer section 35 between the self-priming oil pump and the oil outlet 33. The buffer section 35 is a spiral buffer section, which can reduce the additional tension constraint caused by the buoyancy shell 3 connecting the oil discharge pipeline 34, thereby ensuring the reliability of the automatic floating movement of the buoyancy shell 3.

[0044] In addition, the horizontal moving mechanism 1 includes a main beam 11, two guide rails 12, a running wheel set 13 and a slide seat. The two guide rails 12 are arranged in parallel on the upper side of the sewage treatment tank, and the main beam 11 is erected between the two guide rails 12; the running wheel set 13 is rotatably installed at both ends of the main beam 11, and the running wheel set 13 and the guide rail 12 are rollingly matched; the slide seat is movably installed on the main beam 11, and the slide seat constitutes a moving part 10 that can move in a horizontal plane. The horizontal moving mechanism 1 is similar to a monorail vehicle, and the slide seat is equivalent to a trolley. It has a simple structure and is easy to control the moving part 10 and the buoyancy shell 3 to move in a horizontal plane.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] 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 oil removal device for a sewage treatment tank, characterized in that: It comprises a horizontal moving mechanism, a support structure, a buoyancy shell and a sinking drive, wherein the horizontal moving mechanism is used to be installed on the upper side of the sewage treatment tank, the horizontal moving mechanism has a moving part that can move translationally in a horizontal plane, and the support structure is arranged on the moving part; The buoyancy shell and the sinking drive are respectively installed on the support structure, and the sinking drive is connected to the buoyancy shell in a transmission manner; an oil collecting chamber is provided inside the buoyancy shell, an oil inlet and a guide wall are provided at the upper part of the buoyancy shell, the oil inlet is connected to the oil collecting chamber, and an oil outlet is provided at the lower part of the buoyancy shell, and the oil outlet is connected to an oil discharge pipeline; The guide wall is arranged around the oil inlet and is concave downward from the outside to the inside. The upper surface of the guide wall is an oleophilic and hydrophobic surface. A sensing element is also provided on the upper part of the buoyancy shell. The sensing element is used to detect the medium environment in which the guide wall is immersed. It also includes a main controller, which is electrically connected to the sensing element and the sinking driver respectively, and is used to receive a medium signal detected by the sensing element, and control the sinking driver to start or shut down according to the medium signal; When the sensing element detects that the medium environment is oil or air, the main controller controls the sinking drive to start to drive the buoyancy shell to sink; when the sensing element detects that the medium environment is water, the main controller controls the sinking drive to close to release the buoyancy shell to automatically float.

2. The floating oil removal device for a sewage treatment tank according to claim 1, characterized in that: The buoyancy shell is a shell structure of any shape such as sphere, ellipsoid, cylinder and cone. The contour of the guide wall is an annular protrusion. The sensing element is arranged on the inner side of the guide wall, and the sensing surface of the sensing element is flush with the upper end surface of the guide wall.

3. The floating oil removal device for a sewage treatment tank according to claim 2, characterized in that: The sensing element comprises a sensing circuit and two conductive contacts, the sensing circuit is sealed and arranged inside the buoyancy shell, the two sensing elements are symmetrically arranged about the oil inlet, and the sensing circuit is electrically connected to the two conductive contacts respectively; When the two conductive contacts are in an electrically disconnected state, the induction circuit sends a medium signal of oil or air to the main controller; when the two conductive contacts are in an electrically connected state, the induction circuit sends a medium signal of water to the main controller.

4. The floating oil removal device for a sewage treatment tank according to claim 1, characterized in that: The support structure is an L-shaped support structure, which includes a vertical section and a horizontal section that are fixedly connected. The vertical section is fixedly installed on the moving part, and the horizontal section is located at the lower end of the vertical section. The horizontal section is provided with a guide sleeve. The lower end of the buoyancy shell is fixedly connected with a positioning rod, and the positioning rod is slidably inserted in the guide sleeve, and the sinking drive is transmission-connected to the positioning rod.

5. The floating oil removal device for a sewage treatment tank according to claim 4, characterized in that: The sinking drive is an electromagnetic repulsion mechanism, which includes a power supply, an electromagnetic coil and a matching piece. The electromagnetic coil is insulated and installed on the lower side of the horizontal section. The lower end of the positioning rod is penetrated and arranged on the lower side of the horizontal section. The matching piece is installed on the lower end of the positioning rod. The electromagnetic coil and the matching piece are arranged at intervals in the upper and lower parts. The power supply is electrically connected to the electromagnetic coil. When started, the electromagnetic coil generates a magnetic field and forms a repulsive force on the matching piece to drive the positioning rod and the buoyancy shell to sink. When turned off, the repulsive force between the electromagnetic coil and the matching piece disappears, allowing the positioning rod and the buoyancy shell to automatically float up.

6. The floating oil removal device for a sewage treatment tank according to claim 5, characterized in that: The power supply is a DC power supply, the matching part is a permanent magnet, the side of the electromagnetic coil facing the permanent magnet is a first magnetic pole, the side of the permanent magnet facing the electromagnetic coil is a second magnetic pole, and the first magnetic pole is the same as the second magnetic pole.

7. The floating oil removal device for a sewage treatment tank according to claim 5, characterized in that: The power supply is an AC power supply, and the matching part is an induction coil or a conductive disk. When started, the electromagnetic coil generates an alternating magnetic field, and the matching part generates an induced current in the alternating magnetic field and forms a coupled magnetic field. The coupled magnetic field is opposite to the alternating magnetic field with the same pole.

8. The floating oil removal device for a sewage treatment tank according to claim 1, characterized in that: The guide wall is made of a hydrophobic and oleophilic material in one piece, and the hydrophobic and oleophilic material is any one of polyethylene, polypropylene, polytetrafluoroethylene, fluororubber, butyl rubber, and hard silica gel, and the upper surface of the hydrophobic and oleophilic material forms the hydrophobic and oleophilic surface; Alternatively, the guide wall is provided with any one of polyvinyl chloride coating, polyurethane coating, nano silicon oxide coating, nano siloxane coating and silicone wax coating, and the surface of any one of polyvinyl chloride coating, polyurethane coating, nano silicon oxide coating, nano siloxane coating and silicone wax coating forms the hydrophobic and oleophilic surface.

9. The floating oil removal device for a sewage treatment tank according to claim 5, characterized in that: A self-priming oil pump is installed on the support structure. The self-priming oil pump is connected to a position of the oil discharge pipeline away from the oil outlet. A buffer section is also arranged on the oil discharge pipeline between the self-priming oil pump and the oil outlet.

10. The floating oil removal device for a sewage treatment tank according to claim 2, characterized in that: The horizontal movement mechanism comprises a main crossbeam, two guide rails, a walking wheel set and a slide seat, the two guide rails are arranged in parallel on the upper side of the sewage treatment tank, and the main crossbeam is erected between the two guide rails; The traveling wheel set is rotatably mounted on both ends of the main beam, and the traveling wheel set is rollingly matched with the guide rail; the slide seat is movably mounted on the main beam, and the slide seat constitutes the moving part that can translate in a horizontal plane.

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